Standard No.:	NB/T 47050-2016
English Name:	Technical specification for reciprocating grate
Chinese Name:	往复炉排技术条件
Professional Classification:	NB    Professional Standard - Energy
Source Content Issued by:	National Energy Administration
Issued on:	2016-08-16
Implemented on:	2016-12-1
Status:	valid
Superseding:	JB/T 9620-1999
Target Language:	English
File Format:	PDF
Word Count:	8500 words
Translation Price(USD):	275.0
Delivery:	via email in 1 business day

NB/T 47050-2016 Technical specification for reciprocating grate 1 Scope This standard specifies the terms and definitions, classification and model designation, technical requirements (including performance, design, manufacturing, and assembly requirements), test methods, inspection rules, painting, packaging, and accompanying documents for reciprocating grates. This standard is applicable to reciprocating grates using coal and biomass as fuel. It may be used as a reference for grates of waste incinerators. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 1804 General tolerances - Tolerances for linear and angular dimensions without individual tolerance indications GB/T 2900.48 Electrotechnical terminology of boilers GB/T 6414 Castings - System of dimensional tolerances and machining allowances GB/T 8492 Heat-resistant steel and alloy castings for general applications GB/T 9437 Heat resistant iron castings GB/T 9439 Grey iron castings GB/T 10180 Thermal performance test code for industrial boilers GB/T 18342 Specifications of coal for chain and travelling grate stoker boiler JB/T 1615 Technical specification for painting and packaging of boiler 3 Terms and definitions For the purposes of this document, the terms and definitions given in GB/T 2900.48 and the following apply. 3.1 reciprocating grate grate that periodically feeds fuel and discharges ash and slag by means of reciprocating motion Note: The grate is classified as a pusher type reciprocating grate when the grate bars move in the same direction as the fuel; otherwise, it is classified as a reverse pushing reciprocating grate. 3.2 main air compartment air compartment located in the main combustion zone of the grate Note: The location of this air compartment is determined according to the fuel characteristics. 3.3 main air compartment air pressure average static pressure in any selected main air compartment, measured under the conditions that the air damper of this compartment is fully open, the air dampers of the other air compartments are fully closed, and both the air flow supplied to this compartment and the fuel-bed thickness are maintained constant 3.4 unevenness coefficient of air distribution across grate width ratio of the difference between the maximum longitudinal average outlet air pressure and the minimum longitudinal average outlet air pressure of the grate corresponding to the air compartment under test to the average outlet air pressure of the grate, expressed as a percentage 3.5 main air compartment air leakage ratio ratio of the difference between the outlet air flow through the grate surface corresponding to any selected main air compartment and the inlet air flow of that compartment to the inlet air flow, expressed as a percentage, measured under the conditions that the air damper of this compartment is fully open, the air dampers of the other air compartments are fully closed, and the inlet air flow of the compartment satisfies the main air compartment air pressure requirements 3.6 air ratio as other compartment(s) air damper(s) fully shut off ratio of the air flow entering the adjacent air compartment(s) to the air flow entering any selected main air compartment, expressed as a percentage, under the conditions that the air damper of this main air compartment is fully open, the air dampers of the other air compartments are fully closed, and the air flow supplied to this main air compartment satisfies the main air compartment air pressure requirement 3.7 fuel leakage ratio mass ratio of the average amount of fuel leaked through the grate, including ash leakage, per unit time to the fuel consumption, expressed as a percentage 3.8 duration of continuous operation uninterrupted operating time that the grate is capable of maintaining without shutdown for grate maintenance, including the hot standby shutdown time of the boiler 3.9 cooling performance ratio of the total side area of the cooling fins of grate bars to the fire-facing area of the grate bars 4 Classification and model designation

Contents Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Classification and model designation 5 Technical requirements 6 Test methods 7 Inspection rules 8 Painting, packaging and accompanying documents