1 General provision
1.0.1 This code is formulated with a view to make boiler plant design go through with national related law, regulation and stipulations to meet requirements of energy conservation, environment protection, safety in production, state-of-the-art technology, economy and rationality and quality-insurance, etc.
1.0.2 This code is applicable to thermal force piping design for industrial, living, district boiler plant and its outdoors in the following scopes:
1 Unit set boiler rated evaporating capacity of steam boiler plant with medium is water is 1—75t/h, rated exit steam pressure is 0.10—3.82 MPa (gauge pressure) and rated exit steam temperature is less than or equal to 450℃;
2 Unit set boiler rated thermal power of hot water boiler plant is 0.7—70 MW, rated exit water pressure is 0.10—2.50 MPa (gauge pressure) and rated exit water temperature is less than or equal to 180℃;
3 Outdoor steam pipe line, condensate pipeline, and closed cycle hot-water system conform to the parameters in items 1 and 2 of this article
1.0.3 This code is not applicable design for boiler plant and city heat supply network of exhaust-heat boiler, boiler, and other special types' boiler.
1.0.4 Design for boiler plant shall not only be in compliance with this code, but also be in compliance with national current relevant mandatory standards.
2 Terminologies
2.0.1 Boiler plant
Boiler and syntheses of auxiliary equipment and facilities ensuring boilers in normal operation
2.0.2 Industrial boiler plant
It refers to self-provided boiler plant subsided by the enterprises. Its mission is to meet the requirement for heating (steam and hot water) of the enterprise itself.
2.0.3 Living boiler plant
It refers to boiler plant providing heat (steam) for people living.
2.0.4 Regional boiler plant
It refers to boiler plant service for some region. In this region, it may be with several enterprises, several civilian constructions and public buildings, etc.
2.0.5 Independent boiler plant
Boiler plant without any structural contact with its surroundings and other constructions
2.0.6 Dependent boiler plant
Boiler plant adjacent to other constructions or boiler plant set inside the construction
2.0.7 Underground boiler plant
Boiler plant set under the ground
2.0.8 Semi-underground boiler plant
Boiler plant set in under the ground with deep in depth exceeding 1/3 of the boiler plant net height and it shall not exceed boiler plant's height.
2.0.9 Basement boiler plant
Boiler plant set inside other constructions, and the deep in depth of boiler plant ground under the outdoor ground exceeds 1/2 of the boiler plant's net height
2.0.10 Semi-basement boiler plant
Boiler plant set inside other constructions, and the deep in depth of boiler plant ground under the outdoor ground exceeds 1/3 of the boiler plant's net height and it shall not exceeds its 1/2
2.0.11 Outdoor thermal piping (including steam, condensate and hot water, hereinafter is the same)
It refers to outdoor thermal pipeline of boiler plant affiliated to enterprises (including organs, communities and schools, etc., hereinafter is the same) and outdoor thermal pipeline with borderline scope of the regional boiler plant.
2.0.12 Atmospheric burner
Burner with atmosphere unventilated by high-velocity jet
2.0.13 Piping
It is composed of pipeline compositions, pipeline supporter and hanger, etc. it is for transportation, distribution, admixture, separation, emission, measurement or fluid flow controlling.
2.0.14 Piping system
A set of pipeline connected by several sticks of pipelines divided according to fluid and design conditions
2.0.15 Pipe support
Pipeline fittings supporting pipeline and bearing acting force of the pipeline
2.0.16 Fixing support
Pipeline support forbidden relative displacement in pipeline and supporting structure
2.0.17 Movable support
Pipeline support permits relative displacement in pipeline and supporting structure
2.0.18 Sliding support
Pipeline movable support with pipe trestle on the supporting structure and making relative slip
2.0.19 Roller support
Pipeline movable support with pipe trestle on the supporting structure and making relative rolling
2.0.20 Pipeline trestle and hanging hook
Pipeline component transfers acting force bearing by pipeline or support to building structure or ground
2.0.21 High trestle
Pipeline trestle with bottom net height of the piping insulation structure lying overground is larger than or equal to 4 m
2.0.22 Medium-height trestle
Pipeline trestle with bottom net height of the piping insulation structure lying overground is larger than or equal to 2 m and less than 4 m
2.0.23 Low trestle
Pipeline trestle with bottom net height of the piping insulation structure lying overground is larger than or equal to 0.3 m and less than 2 m
2.0.24 Fixing trestle
Pipeline trestle forbidden relative displacement in pipeline and its supporting structure
2.0.25 Movable trestle
Pipeline trestle permits relative displacement in pipeline and its supporting structure
2.0.26 Sliding trestle
Pipeline trestle permits relative slip in pipeline and its supporting structure
2.0.27 Cantilever trestle
Trestle adopting cantilever structural support pipeline
2.0.28 Guiding trestle
Movable trestle permits pipeline axial displacement
2.0.29 Roller trestle
Pipeline movable trestle with pipe trestle rolling on the supporting structure
2.0.30 Trussed trestle
Pipeline trestle with trestles connected to be an integrate part with longitudinal truss along tubular axis.
2.0.31 Year-round steam (heat) supply
It refers to supply steam (heat) all year round without interruption to the heat users, when interrupting steam (heat) supply; it will result in life risk of people or great economic loss.
2.0.32 People close-packed area
It refers to boardroom, auditorium, classroom, bathhouse, restaurant, hospital, emporia, nursery and waiting room, etc.
2.0.33 Important area
It refers to confidential archives, signal station and VIP lounge, etc.
2.0.34 Boiler room
Location installing with boiler proper
2.0.35 Auxiliary room
It refers to location installing with auxiliaries, auxiliary equipments, and production operation except boiler plant, such as water curing house, blower fan house, pump room, workshop, control laboratory and instrument control room, etc.
2.0.36 Service room
It refers to location for living or working of the employees, such as duty room, rest room, office, in-house use bathroom and lavatory, etc.
2.0.37 Duty room
It refers to location for worker changing and depositing clothes before and after working (not refer to depositing clothes in the bathroom when showering).
2.0.38 Rest room
It refers to location for workers' rest during work in shifts in the two or three-shift boiler plant.
2.0.39 Operation feed water pump
It refers to feed water pump is with regular service in operation
2.0.40 Standby feed water pump
It refers to pump feeds water for boiler when operation feed water pump is going wrong.
2.0.41 Emergency feed water pump
It refers to feed water pump preventing from boiler occurring with water shortage emergency when electrically driven feed pump is out of action because of power off.
2.0.42 Interval mechanical
It refers to handling and coal shipping operation is discontinuance. These equipments are simple, pragmatic, and reliable, generally it requires being assisted with certain manpower, and it is with low efficiency, such as forklift, movable apron conveyer, etc.
2.0.43 Continuous mechanical
It refers to handling and coal shipping operation is succession. Equipments are connected mutually, and coal is handling from coal yard. It is connected to an uninterrupted transportation assembly line till it is shipped to coal bunker of the boiler plant, such as clamshell crane, bar gate type auger stripper, belt conveyer, continuous bucket elevator, and embedded scraper transporter.
2.0.44 Net distance
It refers to distance exterior margins of the most protruding and adjacent parts of two objects.
2.0.45 Relative density
Ratio between gas density and air density
3 Basic requirements
3.0.1 Boiler plant design shall be made according to approved city (region) or enterprises' general planning and heating plans, it shall be combined long-term and short-term, and give priority to the short-term plan, and it should be left with extension leeway. It shall obtain original data for technological equipments and pipeline for extension and renovation boiler plant, and it shall make full use of the original constructions, structures, equipments and pipelines, and simultaneously, it shall co-ordinate with arrangement of the original production system and equipments and forms of the original constructions and structures.
3.0.2 Boiler plant design shall obtain information about thermal load, fuel and water quality and it shall obtain related base values on local meteorology, geologic, hydrology, electric power, and water supply.
3.0.3 Adoption of boiler plant fuel shall make full use of energy source and achieve energy conservation, and it shall co-ordinate with safety in production, economic efficiency and environmental protection; the adopted fuel shall be with information about its origin and elementary composition analyses, etc. and corresponding fuel supply agreement, as well as it shall be in accordance with the following requirements:
1 Boiler plant set inside other constructions shall adopt fuel oil or fuel gas;
2 When adopting fuel oil, it should not adopt heavy oil or reside;
3 Underground, semi-underground, basement, and semi-basement boiler plant must not adopt liquefied petroleum gas or gas fuel with relative density is larger than or equal to 0.75;
4 Guarantee fuel for gas-fired boiler plant shall be determined according to safety and significance of the heating system as well as assurance degree of the gas supply department and possibility of guarantee fuel, etc.
3.0.4 Boiler plant design must adopt effective measure alleviating waste gas, waste water, solid waste residue, and noise influencing the environment. Expulsive deleterious waste and noise shall be in compliance with national current relevant standard and code.
3.0.5 Supply for thermal load required by enterprise shall be determined according to local heat supply plans. When enterprise thermal load cannot be supplied by regional heat power station, regional boiler plant, or other enterprise's boiler plant and it is without cogeneration conditions, it should be set with boiler plant.
3.0.6 Supply for thermal load required by the region shall be determined according to local heat supply plans of that city (region). When it meets one of the following conditions, it may be set with regional boiler plant;
1 Heating and living thermal load of housing area and public buildings facilities are not belonging to the heat power station supply scope;
2 User's production, heating and ventilation and living thermal load are too small, load is instable and using hours per year is small, or it is not equipped with cogeneration condition because of site and fund, etc.
3 It requires oversize heat supply according to city heating plans and user's heat using requirement of advance, it may be used as peak shaving for the heat power station or act as alternate heat source.
3.0.7 Boiler plant capacity shall be determined according to designing thermal load. Design thermal load should be determined by calculation of protracting thermal load curve or thermal balance system diagram and counting in thermal loss, boiler plant in-house use caloricity and explosible surplus caloricity.
When it lacks of thermal load curve or thermal balance system diagram, design thermal load may be determined according to production, heating and ventilation and air conditioning, maximal heat consumption in living hour, and after counting in thermal loss, afterheat using capacity and simultaneous coefficient of performance.
3.0.8 When thermal load of the heat user varies too much and occurs too frequently, or it is periodical variation, it should set steam regenerator under the principle of economy and rationality. Calculated rating of boiler plant setting with steam regenerator shall be determined by calculation of thermal load balanced.
3.0.9 Selection of boiler heat supply medium shall meet the following requirements:
1 Boiler plant supply heat for heating, ventilation, air conditioning and living should adopt hot water act as heat supply medium;
2 Boiler plant giving priority to process steam shall adopt steam act as heat supply medium;
3 Boiler plant supply heat for both process steam and heating, ventilation, air conditioning and living may adopt steam or steam and hot water act as heat supply medium by technical and economic comparison.
3.0.10 Selection for boiler heat supply medium parameters shall meet the following requirements:
1 Selection for boiler plant for process steam pressure and temperature shall meet production process requirement;
2 Designed supply water temperature of hot water heat supply network and backwater temperature shall be determined according to engineering actual conditions and synthesize boiler plant, pipe network, heating power station and quadric heating system of the heat users, etc., and then determined through technical and economic comparison.
3.0.11 Selection for boiler shall not only be in compliance with article 3.0.9 and article 3.0.10 of this code, but also meet the following requirements:
1 It shall be able to burn all the fuel effectively and with higher thermal efficiency and adaptable to thermal load variation;
2 It shall be favorable for environment protection;
3 It shall be able to reduce capital investment and operational guidance expense;
4 It shall adopt boiler with higher degree of mechanization and automaticity;
5 It should adopt boilers with same capacity and combustion equipment; when adopting boilers with different capacity and different types, its capacity and types should not exceeds 2 types;
6 Its structure shall be correspondence with local earthquake protection intensity;
7 Fuel oil and gas-fired boiler shall not only meet the above requirements, but also meet the requirement for unattended operation and it shall be with reliable safety burning protector.
3.0.12 Determination of set numbers and capacity of the boilers shall meet the following requirements:
1 Sets numbers and capacity of the boilers shall be able to satisfy the maximal calculated thermal load of the boiler plant when all the boilers are with rated evaporative capacity or thermal power while operating;
2 It shall ensure boiler plant operating safely in operation condition with higher or lower thermal load, and it shall make boiler numbers, rated evaporative capacity or thermal power and other running performance accommodate to thermal load variation effectively, as well as it shall consider operation condition of boiler unit in thermal load low cycle all year round;
3 Boilers numbers in the boiler plant should not be less than 2, but if one set of boiler can meet requirement for thermal load and overhauling, it may set only one set of boiler;
4 Boiler total numbers in the boiler plant should not exceed 5 for construction boiler plant; when it is in extension and renovation, total numbers should not exceeds 7; dependent boiler plant should not exceed 4;
5 When overhauling one of the boilers with maximal rated evaporative capacity or thermal power in the boiler plant with several boilers, the rest boilers shall meet the following requirements:
1) The lowest thermal load for heat consumption under continuous production;
2) The lowest thermal load for heat consumption of heating and ventilation, air conditioning and living
3.0.13 When building in regions with earthquake protection intensity is 6° to 9°, its construction, structures and piping design shall all take measures be in compliance with local earthquake protection standard.
3.0.14 Boiler plant should be set with necessary repairing, transportation, and living facilities; when it may be cooperated with its affiliated enterprise or adjacent enterprise, it may not be set independently.
4 Arrangement for the boiler plant
4.1 Selection of location
4.1.1 Selecting location for boiler plant shall be determined according to the following factor analysis:
1 It shall approach region with concentrated thermal load and make arrangement of educing thermal pipeline and outdoor pipe network is reasonable in technology and economy;
2 It shall be convenient for fuel storing and transportation and cinder delivering, and it should separate logistics of pedestrian flow and transportation of fuel and cinder;
3 Extension end should be left with extension leeway;
4 It shall be favorable for natural ventilation and lighting;
5 It shall lie in region with good geological conditions;
6 It shall be favorable for reducing influence of smoke dust, noxious gas, noise, and cinder to residential area and major environmental protection region. boiler plant running all year round shall be set at windward side of the wind direction with integral minimal frequency, boiler plant with seasonal running shall be set at leeside of the wind direction with maximum frequency in that season and it shall meet the requirements proposed in the environmental impact assessment report;
7 Coal burning boiler plant and coal gas generating station should be set in the same region;
8 It shall be favorable for the reclaiming of condensate;
9 Regional boiler plants shall meet the requirements of master city plan and district heating plan;
10 Location for boiler plant of enterprise producing flammability and high explosive cargo shall not only meet the above requirement, but also be in compliance with codes of relevant profession.
4.1.2 Boiler plant should be independent building.
4.1.3 When boiler plant is connected with other buildings or it is set inside them, it must not be set in site with dense staffs and upper floor, lower floor, adjacent location as well as both sides of the main thoroughfare and emergency exit of the important department. It shall be set in the first floor or part near building external wall of the first floor of basement.
4.1.4 It should not set boiler plant in residential housing.
4.1.5 Boiler plant adopts pulverized coal fired boiler shall not be set in residential area, landscape and place of interest and other major environmental protection district.
4.1.6 Boiler plant adopts circulating fluid bed should not be set in residential area.
4.2 Arrangement for building, structures, and location
4.2.1 Plan layout and spatial array of buildings and structures in independent boiler plant region shall be compact and reasonable, sectorization shall be explicit, construction shall be concise and harmonize and it shall meet the requirement of fluently process flow, safe operation, convenient transportation and favourable installation and overhaul.
4.2.2 Station front plan for construction regional boiler plant shall be harmonize with local regional plan. Main body building and subsidiary building should adopt integral arrangement. Main facade of the building in boiler plant region should be facing main road and integral layout shall be reasonable and with esthetic appearance.
4.2.3 Building type and layout of industrial boiler plant shall be harmonize with building style of the local enterprise; building type and layout of civil boiler plant and regional boiler plant shall be harmonize with building style of the city (region).
4.2.4 Arrangement for buildings, structures, and site in boiler plant region shall take full advantage of terrain to make excavated volume and earth fill capacity be minimal and make the drain be fluent and it shall also prevent water inflowing basement and pipe trench.
4.2.5 Spacing between boiler plant, coal yard, cinder field, grease pot and fuel gas pressure regulating station as well as between them and other buildings and structures shall meet requirement of current national standard "Code of Design on Building Fire Protection and Prevention” GB 50016, "Code for Design of City Gas Engineering” GB 50028 and related standard code, and it shall meet the requirement for installation, operation and overhauling.
4.2.6 Arrangement for coal shipping system shall make use of terrain to make lessen hoisting height and shorten shipment distance. Coal yard and cinder field should lie at the windward side with minimal frequency wind direction for the key construction all year round.
4.2.7 Bottom layer elevation and structures fundamental superface elevation inside the buildings of boiler plant shall be 0.15m and more than the height of outdoor terrace or the surrounding terrace. Auxiliary house of boiler plant shall be unit with that on the same floor.
1 General provision
2 Terminologies
3 Basic requirements
4 Arrangement for the boiler plant
4.1 Selection of location
4.2 Arrangement for building, structures, and location
4.3 Arrangement for boiler plant, auxiliary house, and welfare room
4.4 Technological arrangement
5 coal burning system
5.1 Coal burning facilities
5.2 Storage and transportation of coal, cinder, and limestone
6 Fuel oil system
6.1 Fuel oil facilities
6.2 Storage and transportation for fuel oil
7 Fuel gas systems
8 Boiler air and gas system
9 Boiler feed water equipment and water treatment
9.1 Boiler feed water equipment
9.2 Water treatment
10 Preparation for heat supply hot water
10.1 Hot water boiler and subsidiary facilities
10.2 Preparation facilities for hot water
11 Monitoring and controlling
11.1 Monitoring
11.2 Controlling
12 Assay and overhaul
12.1 Assay
12.2 Overhaul
13 Pipeline of boiler plant
13.1 Pipeline of aerated water
13.2 Fuel pipeline
13.3 Gas pipeline
14 Thermal retardation and corrosion protection
14.1 Thermal retardation
14.2 Corrosion protection
15 Civil structure, electricity, heating and ventilation, as well as feedwater and drainage
15.1 Civil structure
15.2 Electricity
15.3 Heating and ventilation
15.4 Feedwater and drainage
16 Environmental protections
16.1 Air pollutant prevention and cure
16.2 Prevention and cure for noise and vibration
16.3 Waste water disposal
16.4 Solid waste disposal
16.5 Planting
17 Firefighting
18 Outdoor thermal pipelines
18.1 Design parameters of the pipeline
18.2 Piping system
18.3 Piping arrangement and lying
18.4 Pipeline and accessory
18.5 Pipeline thermal compensation and pipeline trestle
Appendix A Clear distance between outdoor thermal pipeline, pipe trench and building, structures, roadway, railway and other pipelines
Explanation of Wording in this code
1 General provision
1.0.1 This code is formulated with a view to make boiler plant design go through with national related law, regulation and stipulations to meet requirements of energy conservation, environment protection, safety in production, state-of-the-art technology, economy and rationality and quality-insurance, etc.
1.0.2 This code is applicable to thermal force piping design for industrial, living, district boiler plant and its outdoors in the following scopes:
1 Unit set boiler rated evaporating capacity of steam boiler plant with medium is water is 1—75t/h, rated exit steam pressure is 0.10—3.82 MPa (gauge pressure) and rated exit steam temperature is less than or equal to 450℃;
2 Unit set boiler rated thermal power of hot water boiler plant is 0.7—70 MW, rated exit water pressure is 0.10—2.50 MPa (gauge pressure) and rated exit water temperature is less than or equal to 180℃;
3 Outdoor steam pipe line, condensate pipeline, and closed cycle hot-water system conform to the parameters in items 1 and 2 of this article
1.0.3 This code is not applicable design for boiler plant and city heat supply network of exhaust-heat boiler, boiler, and other special types' boiler.
1.0.4 Design for boiler plant shall not only be in compliance with this code, but also be in compliance with national current relevant mandatory standards.
2 Terminologies
2.0.1 Boiler plant
Boiler and syntheses of auxiliary equipment and facilities ensuring boilers in normal operation
2.0.2 Industrial boiler plant
It refers to self-provided boiler plant subsided by the enterprises. Its mission is to meet the requirement for heating (steam and hot water) of the enterprise itself.
2.0.3 Living boiler plant
It refers to boiler plant providing heat (steam) for people living.
2.0.4 Regional boiler plant
It refers to boiler plant service for some region. In this region, it may be with several enterprises, several civilian constructions and public buildings, etc.
2.0.5 Independent boiler plant
Boiler plant without any structural contact with its surroundings and other constructions
2.0.6 Dependent boiler plant
Boiler plant adjacent to other constructions or boiler plant set inside the construction
2.0.7 Underground boiler plant
Boiler plant set under the ground
2.0.8 Semi-underground boiler plant
Boiler plant set in under the ground with deep in depth exceeding 1/3 of the boiler plant net height and it shall not exceed boiler plant's height.
2.0.9 Basement boiler plant
Boiler plant set inside other constructions, and the deep in depth of boiler plant ground under the outdoor ground exceeds 1/2 of the boiler plant's net height
2.0.10 Semi-basement boiler plant
Boiler plant set inside other constructions, and the deep in depth of boiler plant ground under the outdoor ground exceeds 1/3 of the boiler plant's net height and it shall not exceeds its 1/2
2.0.11 Outdoor thermal piping (including steam, condensate and hot water, hereinafter is the same)
It refers to outdoor thermal pipeline of boiler plant affiliated to enterprises (including organs, communities and schools, etc., hereinafter is the same) and outdoor thermal pipeline with borderline scope of the regional boiler plant.
2.0.12 Atmospheric burner
Burner with atmosphere unventilated by high-velocity jet
2.0.13 Piping
It is composed of pipeline compositions, pipeline supporter and hanger, etc. it is for transportation, distribution, admixture, separation, emission, measurement or fluid flow controlling.
2.0.14 Piping system
A set of pipeline connected by several sticks of pipelines divided according to fluid and design conditions
2.0.15 Pipe support
Pipeline fittings supporting pipeline and bearing acting force of the pipeline
2.0.16 Fixing support
Pipeline support forbidden relative displacement in pipeline and supporting structure
2.0.17 Movable support
Pipeline support permits relative displacement in pipeline and supporting structure
2.0.18 Sliding support
Pipeline movable support with pipe trestle on the supporting structure and making relative slip
2.0.19 Roller support
Pipeline movable support with pipe trestle on the supporting structure and making relative rolling
2.0.20 Pipeline trestle and hanging hook
Pipeline component transfers acting force bearing by pipeline or support to building structure or ground
2.0.21 High trestle
Pipeline trestle with bottom net height of the piping insulation structure lying overground is larger than or equal to 4 m
2.0.22 Medium-height trestle
Pipeline trestle with bottom net height of the piping insulation structure lying overground is larger than or equal to 2 m and less than 4 m
2.0.23 Low trestle
Pipeline trestle with bottom net height of the piping insulation structure lying overground is larger than or equal to 0.3 m and less than 2 m
2.0.24 Fixing trestle
Pipeline trestle forbidden relative displacement in pipeline and its supporting structure
2.0.25 Movable trestle
Pipeline trestle permits relative displacement in pipeline and its supporting structure
2.0.26 Sliding trestle
Pipeline trestle permits relative slip in pipeline and its supporting structure
2.0.27 Cantilever trestle
Trestle adopting cantilever structural support pipeline
2.0.28 Guiding trestle
Movable trestle permits pipeline axial displacement
2.0.29 Roller trestle
Pipeline movable trestle with pipe trestle rolling on the supporting structure
2.0.30 Trussed trestle
Pipeline trestle with trestles connected to be an integrate part with longitudinal truss along tubular axis.
2.0.31 Year-round steam (heat) supply
It refers to supply steam (heat) all year round without interruption to the heat users, when interrupting steam (heat) supply; it will result in life risk of people or great economic loss.
2.0.32 People close-packed area
It refers to boardroom, auditorium, classroom, bathhouse, restaurant, hospital, emporia, nursery and waiting room, etc.
2.0.33 Important area
It refers to confidential archives, signal station and VIP lounge, etc.
2.0.34 Boiler room
Location installing with boiler proper
2.0.35 Auxiliary room
It refers to location installing with auxiliaries, auxiliary equipments, and production operation except boiler plant, such as water curing house, blower fan house, pump room, workshop, control laboratory and instrument control room, etc.
2.0.36 Service room
It refers to location for living or working of the employees, such as duty room, rest room, office, in-house use bathroom and lavatory, etc.
2.0.37 Duty room
It refers to location for worker changing and depositing clothes before and after working (not refer to depositing clothes in the bathroom when showering).
2.0.38 Rest room
It refers to location for workers' rest during work in shifts in the two or three-shift boiler plant.
2.0.39 Operation feed water pump
It refers to feed water pump is with regular service in operation
2.0.40 Standby feed water pump
It refers to pump feeds water for boiler when operation feed water pump is going wrong.
2.0.41 Emergency feed water pump
It refers to feed water pump preventing from boiler occurring with water shortage emergency when electrically driven feed pump is out of action because of power off.
2.0.42 Interval mechanical
It refers to handling and coal shipping operation is discontinuance. These equipments are simple, pragmatic, and reliable, generally it requires being assisted with certain manpower, and it is with low efficiency, such as forklift, movable apron conveyer, etc.
2.0.43 Continuous mechanical
It refers to handling and coal shipping operation is succession. Equipments are connected mutually, and coal is handling from coal yard. It is connected to an uninterrupted transportation assembly line till it is shipped to coal bunker of the boiler plant, such as clamshell crane, bar gate type auger stripper, belt conveyer, continuous bucket elevator, and embedded scraper transporter.
2.0.44 Net distance
It refers to distance exterior margins of the most protruding and adjacent parts of two objects.
2.0.45 Relative density
Ratio between gas density and air density
3 Basic requirements
3.0.1 Boiler plant design shall be made according to approved city (region) or enterprises' general planning and heating plans, it shall be combined long-term and short-term, and give priority to the short-term plan, and it should be left with extension leeway. It shall obtain original data for technological equipments and pipeline for extension and renovation boiler plant, and it shall make full use of the original constructions, structures, equipments and pipelines, and simultaneously, it shall co-ordinate with arrangement of the original production system and equipments and forms of the original constructions and structures.
3.0.2 Boiler plant design shall obtain information about thermal load, fuel and water quality and it shall obtain related base values on local meteorology, geologic, hydrology, electric power, and water supply.
3.0.3 Adoption of boiler plant fuel shall make full use of energy source and achieve energy conservation, and it shall co-ordinate with safety in production, economic efficiency and environmental protection; the adopted fuel shall be with information about its origin and elementary composition analyses, etc. and corresponding fuel supply agreement, as well as it shall be in accordance with the following requirements:
1 Boiler plant set inside other constructions shall adopt fuel oil or fuel gas;
2 When adopting fuel oil, it should not adopt heavy oil or reside;
3 Underground, semi-underground, basement, and semi-basement boiler plant must not adopt liquefied petroleum gas or gas fuel with relative density is larger than or equal to 0.75;
4 Guarantee fuel for gas-fired boiler plant shall be determined according to safety and significance of the heating system as well as assurance degree of the gas supply department and possibility of guarantee fuel, etc.
3.0.4 Boiler plant design must adopt effective measure alleviating waste gas, waste water, solid waste residue, and noise influencing the environment. Expulsive deleterious waste and noise shall be in compliance with national current relevant standard and code.
3.0.5 Supply for thermal load required by enterprise shall be determined according to local heat supply plans. When enterprise thermal load cannot be supplied by regional heat power station, regional boiler plant, or other enterprise's boiler plant and it is without cogeneration conditions, it should be set with boiler plant.
3.0.6 Supply for thermal load required by the region shall be determined according to local heat supply plans of that city (region). When it meets one of the following conditions, it may be set with regional boiler plant;
1 Heating and living thermal load of housing area and public buildings facilities are not belonging to the heat power station supply scope;
2 User's production, heating and ventilation and living thermal load are too small, load is instable and using hours per year is small, or it is not equipped with cogeneration condition because of site and fund, etc.
3 It requires oversize heat supply according to city heating plans and user's heat using requirement of advance, it may be used as peak shaving for the heat power station or act as alternate heat source.
3.0.7 Boiler plant capacity shall be determined according to designing thermal load. Design thermal load should be determined by calculation of protracting thermal load curve or thermal balance system diagram and counting in thermal loss, boiler plant in-house use caloricity and explosible surplus caloricity.
When it lacks of thermal load curve or thermal balance system diagram, design thermal load may be determined according to production, heating and ventilation and air conditioning, maximal heat consumption in living hour, and after counting in thermal loss, afterheat using capacity and simultaneous coefficient of performance.
3.0.8 When thermal load of the heat user varies too much and occurs too frequently, or it is periodical variation, it should set steam regenerator under the principle of economy and rationality. Calculated rating of boiler plant setting with steam regenerator shall be determined by calculation of thermal load balanced.
3.0.9 Selection of boiler heat supply medium shall meet the following requirements:
1 Boiler plant supply heat for heating, ventilation, air conditioning and living should adopt hot water act as heat supply medium;
2 Boiler plant giving priority to process steam shall adopt steam act as heat supply medium;
3 Boiler plant supply heat for both process steam and heating, ventilation, air conditioning and living may adopt steam or steam and hot water act as heat supply medium by technical and economic comparison.
3.0.10 Selection for boiler heat supply medium parameters shall meet the following requirements:
1 Selection for boiler plant for process steam pressure and temperature shall meet production process requirement;
2 Designed supply water temperature of hot water heat supply network and backwater temperature shall be determined according to engineering actual conditions and synthesize boiler plant, pipe network, heating power station and quadric heating system of the heat users, etc., and then determined through technical and economic comparison.
3.0.11 Selection for boiler shall not only be in compliance with article 3.0.9 and article 3.0.10 of this code, but also meet the following requirements:
1 It shall be able to burn all the fuel effectively and with higher thermal efficiency and adaptable to thermal load variation;
2 It shall be favorable for environment protection;
3 It shall be able to reduce capital investment and operational guidance expense;
4 It shall adopt boiler with higher degree of mechanization and automaticity;
5 It should adopt boilers with same capacity and combustion equipment; when adopting boilers with different capacity and different types, its capacity and types should not exceeds 2 types;
6 Its structure shall be correspondence with local earthquake protection intensity;
7 Fuel oil and gas-fired boiler shall not only meet the above requirements, but also meet the requirement for unattended operation and it shall be with reliable safety burning protector.
3.0.12 Determination of set numbers and capacity of the boilers shall meet the following requirements:
1 Sets numbers and capacity of the boilers shall be able to satisfy the maximal calculated thermal load of the boiler plant when all the boilers are with rated evaporative capacity or thermal power while operating;
2 It shall ensure boiler plant operating safely in operation condition with higher or lower thermal load, and it shall make boiler numbers, rated evaporative capacity or thermal power and other running performance accommodate to thermal load variation effectively, as well as it shall consider operation condition of boiler unit in thermal load low cycle all year round;
3 Boilers numbers in the boiler plant should not be less than 2, but if one set of boiler can meet requirement for thermal load and overhauling, it may set only one set of boiler;
4 Boiler total numbers in the boiler plant should not exceed 5 for construction boiler plant; when it is in extension and renovation, total numbers should not exceeds 7; dependent boiler plant should not exceed 4;
5 When overhauling one of the boilers with maximal rated evaporative capacity or thermal power in the boiler plant with several boilers, the rest boilers shall meet the following requirements:
1) The lowest thermal load for heat consumption under continuous production;
2) The lowest thermal load for heat consumption of heating and ventilation, air conditioning and living
3.0.13 When building in regions with earthquake protection intensity is 6° to 9°, its construction, structures and piping design shall all take measures be in compliance with local earthquake protection standard.
3.0.14 Boiler plant should be set with necessary repairing, transportation, and living facilities; when it may be cooperated with its affiliated enterprise or adjacent enterprise, it may not be set independently.
4 Arrangement for the boiler plant
4.1 Selection of location
4.1.1 Selecting location for boiler plant shall be determined according to the following factor analysis:
1 It shall approach region with concentrated thermal load and make arrangement of educing thermal pipeline and outdoor pipe network is reasonable in technology and economy;
2 It shall be convenient for fuel storing and transportation and cinder delivering, and it should separate logistics of pedestrian flow and transportation of fuel and cinder;
3 Extension end should be left with extension leeway;
4 It shall be favorable for natural ventilation and lighting;
5 It shall lie in region with good geological conditions;
6 It shall be favorable for reducing influence of smoke dust, noxious gas, noise, and cinder to residential area and major environmental protection region. boiler plant running all year round shall be set at windward side of the wind direction with integral minimal frequency, boiler plant with seasonal running shall be set at leeside of the wind direction with maximum frequency in that season and it shall meet the requirements proposed in the environmental impact assessment report;
7 Coal burning boiler plant and coal gas generating station should be set in the same region;
8 It shall be favorable for the reclaiming of condensate;
9 Regional boiler plants shall meet the requirements of master city plan and district heating plan;
10 Location for boiler plant of enterprise producing flammability and high explosive cargo shall not only meet the above requirement, but also be in compliance with codes of relevant profession.
4.1.2 Boiler plant should be independent building.
4.1.3 When boiler plant is connected with other buildings or it is set inside them, it must not be set in site with dense staffs and upper floor, lower floor, adjacent location as well as both sides of the main thoroughfare and emergency exit of the important department. It shall be set in the first floor or part near building external wall of the first floor of basement.
4.1.4 It should not set boiler plant in residential housing.
4.1.5 Boiler plant adopts pulverized coal fired boiler shall not be set in residential area, landscape and place of interest and other major environmental protection district.
4.1.6 Boiler plant adopts circulating fluid bed should not be set in residential area.
4.2 Arrangement for building, structures, and location
4.2.1 Plan layout and spatial array of buildings and structures in independent boiler plant region shall be compact and reasonable, sectorization shall be explicit, construction shall be concise and harmonize and it shall meet the requirement of fluently process flow, safe operation, convenient transportation and favourable installation and overhaul.
4.2.2 Station front plan for construction regional boiler plant shall be harmonize with local regional plan. Main body building and subsidiary building should adopt integral arrangement. Main facade of the building in boiler plant region should be facing main road and integral layout shall be reasonable and with esthetic appearance.
4.2.3 Building type and layout of industrial boiler plant shall be harmonize with building style of the local enterprise; building type and layout of civil boiler plant and regional boiler plant shall be harmonize with building style of the city (region).
4.2.4 Arrangement for buildings, structures, and site in boiler plant region shall take full advantage of terrain to make excavated volume and earth fill capacity be minimal and make the drain be fluent and it shall also prevent water inflowing basement and pipe trench.
4.2.5 Spacing between boiler plant, coal yard, cinder field, grease pot and fuel gas pressure regulating station as well as between them and other buildings and structures shall meet requirement of current national standard "Code of Design on Building Fire Protection and Prevention” GB 50016, "Code for Design of City Gas Engineering” GB 50028 and related standard code, and it shall meet the requirement for installation, operation and overhauling.
4.2.6 Arrangement for coal shipping system shall make use of terrain to make lessen hoisting height and shorten shipment distance. Coal yard and cinder field should lie at the windward side with minimal frequency wind direction for the key construction all year round.
4.2.7 Bottom layer elevation and structures fundamental superface elevation inside the buildings of boiler plant shall be 0.15m and more than the height of outdoor terrace or the surrounding terrace. Auxiliary house of boiler plant shall be unit with that on the same floor.
Contents of GB 50041-2008
1 General provision
2 Terminologies
3 Basic requirements
4 Arrangement for the boiler plant
4.1 Selection of location
4.2 Arrangement for building, structures, and location
4.3 Arrangement for boiler plant, auxiliary house, and welfare room
4.4 Technological arrangement
5 coal burning system
5.1 Coal burning facilities
5.2 Storage and transportation of coal, cinder, and limestone
6 Fuel oil system
6.1 Fuel oil facilities
6.2 Storage and transportation for fuel oil
7 Fuel gas systems
8 Boiler air and gas system
9 Boiler feed water equipment and water treatment
9.1 Boiler feed water equipment
9.2 Water treatment
10 Preparation for heat supply hot water
10.1 Hot water boiler and subsidiary facilities
10.2 Preparation facilities for hot water
11 Monitoring and controlling
11.1 Monitoring
11.2 Controlling
12 Assay and overhaul
12.1 Assay
12.2 Overhaul
13 Pipeline of boiler plant
13.1 Pipeline of aerated water
13.2 Fuel pipeline
13.3 Gas pipeline
14 Thermal retardation and corrosion protection
14.1 Thermal retardation
14.2 Corrosion protection
15 Civil structure, electricity, heating and ventilation, as well as feedwater and drainage
15.1 Civil structure
15.2 Electricity
15.3 Heating and ventilation
15.4 Feedwater and drainage
16 Environmental protections
16.1 Air pollutant prevention and cure
16.2 Prevention and cure for noise and vibration
16.3 Waste water disposal
16.4 Solid waste disposal
16.5 Planting
17 Firefighting
18 Outdoor thermal pipelines
18.1 Design parameters of the pipeline
18.2 Piping system
18.3 Piping arrangement and lying
18.4 Pipeline and accessory
18.5 Pipeline thermal compensation and pipeline trestle
Appendix A Clear distance between outdoor thermal pipeline, pipe trench and building, structures, roadway, railway and other pipelines
Explanation of Wording in this code
