GB/T 31911-2015 Methods for determination of emissions from appliances burning gaseous fuels
1 Scope
This standard specifies the terms and definitions for the determination of NOx, CO, CO2 and O2 in the emissions from appliances burning gaseous fuels, measuring system, analyzer, auxiliary equipment and accessories, system inspection, sampling, test operation and calculation method.
This standard is applicable to the type inspection of appliances burning gaseous fuels and the determination of emissions in other inspections.
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 (including any amendments) applies.
GB 16410 Domestic gas cooking appliances
GB 25034 Gas-fired heating and hot water combi-boiler
CJ/T 28 Chinese cooking gas appliances
JJF 1059.1 Evaluation and expression of uncertainty in measurement
JJF 1001 General terms in metrology and their definitions
3 Terms and definitions
For the purposes of this document, the terms and definitions given in JJF 1001 apply.
4 Measuring system, analyzer, auxiliary equipment and accessories
4.1 Measuring system
4.1.1 Dry sampling
See Figure 1 for the measuring system.
4.2 Analyzer
4.2.1 Types
This standard applies to analyzers with the following measuring principles:
a) analyzer for measuring NOχ concentration by chemiluminescence method;
b) analyzer for measuring NOχ concentration by infrared or ultraviolet absorption principle, when the concentration of NOχ is greater than 100×10-6m3/m3;
c) analyzer for measuring CO and CO2 concentration by infrared or ultraviolet absorption principle;
d) analyzer for measuring O2 concentration by paramagnetic principle;
4.2.2 Indication error
The indication error of analyzer shall not exceed ±5%.
4.2.3 Repeatability
The repeatability of analyzer shall not exceed 2%.
4.2.4 Response time
The response time from adding standard gas to displaying 90% indicated concentration shall not be larger than 20 s.
4.2.5 Stability
The change of indicated value within 1 h shall not be greater than 5%.
4.2.6 Interference
The interference of CO₂, O₂ and H₂O shall be considered in analyzer measurement. The interference may be corrected by using the correction data provided by the manufacturer or the standard gas with the same concentration.
4.3 Auxiliary equipment
4.3.1 Sampler
4.3.1.1 General requirements
The sampler shall be made of materials that do not have chemical reaction with the sample tested and have no adsorption or weak adsorption, and the homogeneity of the sample shall be ensured.
4.3.1.2 Unbalanced smoke exhaust burner with exhaust pipe
For exhaust pipes with DN100 or above, the sampler shown in Figure 3 should be adopted; and the sampler shown in Figure 4 may be used for those under DN100. Combustion emission samples shall be collected at a distance of 200 mm from the flue outlet, as shown in Figure 5.
4.3.1.3 Balanced smoke exhaust burner with exhaust pipe
Balanced gas appliance sampler with exhaust pipe and its sampling position shall comply with GB 25034.
4.3.1.4 Domestic gas cooking appliances
Domestic gas cooking appliance sampler and its sampling position shall comply with GB 16410.
4.3.1.5 Commercial gas cooking appliances
Commercial gas appliance sampler and its sampling position shall comply with CJ/T 28.
4.3.2 Condenser or penetration dryer
The condenser in contact with the sample shall be made of glass, PTFE or stainless steel, etc., and its capacity shall match the sampling gas flow rate and the concentration of water vapor. The dew point temperature of flue gas at the outlet of condenser or penetration dryer shall be below ambient temperature, and the cooling temperature should be between 2℃ and 5℃, and condensate shall be recovered quickly to reduce contact with the sample. Desiccant shall not be used.
When penetration drying method is used, one-half of the dryer tube shall be heated to at least 15 K above the gas dew point, and it shall meet the manufacturer's requirements for purging air.
4.3.3 Filter
Filter shall be installed between the condenser and the distributor, and the material in contact with the sample shall be of stainless steel or glass. The size of the filter shall be determined based on the sampling gas flow and the flow data per unit area provided by the manufacturer. The filter diameter of the filter shall not be greater than 1μm, and the contamination on the filter shall be prevented from reacting with gas.
4.3.4 Distributor
The distributor shall be made of stainless steel or PTFE, and the volume shall be as small as possible, and the upper flow limit shall ensure the sample flow required for each analyzer. Each analyzer shall be able to connect with distributor independently, and shall have a discharge system to the outside.
Standard
GB/T 31911-2015 Methods for determination of emissions from appliances burning gaseous fuels (English Version)
Standard No.
GB/T 31911-2015
Status
valid
Language
English
File Format
PDF
Word Count
10500 words
Price(USD)
310.0
Implemented on
2016-8-1
Delivery
via email in 1~3 business day
Detail of GB/T 31911-2015
Standard No.
GB/T 31911-2015
English Name
Methods for determination of emissions from appliances burning gaseous fuels
GB/T 31911-2015 Methods for determination of emissions from appliances burning gaseous fuels
1 Scope
This standard specifies the terms and definitions for the determination of NOx, CO, CO2 and O2 in the emissions from appliances burning gaseous fuels, measuring system, analyzer, auxiliary equipment and accessories, system inspection, sampling, test operation and calculation method.
This standard is applicable to the type inspection of appliances burning gaseous fuels and the determination of emissions in other inspections.
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 (including any amendments) applies.
GB 16410 Domestic gas cooking appliances
GB 25034 Gas-fired heating and hot water combi-boiler
CJ/T 28 Chinese cooking gas appliances
JJF 1059.1 Evaluation and expression of uncertainty in measurement
JJF 1001 General terms in metrology and their definitions
3 Terms and definitions
For the purposes of this document, the terms and definitions given in JJF 1001 apply.
4 Measuring system, analyzer, auxiliary equipment and accessories
4.1 Measuring system
4.1.1 Dry sampling
See Figure 1 for the measuring system.
4.2 Analyzer
4.2.1 Types
This standard applies to analyzers with the following measuring principles:
a) analyzer for measuring NOχ concentration by chemiluminescence method;
b) analyzer for measuring NOχ concentration by infrared or ultraviolet absorption principle, when the concentration of NOχ is greater than 100×10-6m3/m3;
c) analyzer for measuring CO and CO2 concentration by infrared or ultraviolet absorption principle;
d) analyzer for measuring O2 concentration by paramagnetic principle;
4.2.2 Indication error
The indication error of analyzer shall not exceed ±5%.
4.2.3 Repeatability
The repeatability of analyzer shall not exceed 2%.
4.2.4 Response time
The response time from adding standard gas to displaying 90% indicated concentration shall not be larger than 20 s.
4.2.5 Stability
The change of indicated value within 1 h shall not be greater than 5%.
4.2.6 Interference
The interference of CO₂, O₂ and H₂O shall be considered in analyzer measurement. The interference may be corrected by using the correction data provided by the manufacturer or the standard gas with the same concentration.
4.3 Auxiliary equipment
4.3.1 Sampler
4.3.1.1 General requirements
The sampler shall be made of materials that do not have chemical reaction with the sample tested and have no adsorption or weak adsorption, and the homogeneity of the sample shall be ensured.
4.3.1.2 Unbalanced smoke exhaust burner with exhaust pipe
For exhaust pipes with DN100 or above, the sampler shown in Figure 3 should be adopted; and the sampler shown in Figure 4 may be used for those under DN100. Combustion emission samples shall be collected at a distance of 200 mm from the flue outlet, as shown in Figure 5.
4.3.1.3 Balanced smoke exhaust burner with exhaust pipe
Balanced gas appliance sampler with exhaust pipe and its sampling position shall comply with GB 25034.
4.3.1.4 Domestic gas cooking appliances
Domestic gas cooking appliance sampler and its sampling position shall comply with GB 16410.
4.3.1.5 Commercial gas cooking appliances
Commercial gas appliance sampler and its sampling position shall comply with CJ/T 28.
4.3.2 Condenser or penetration dryer
The condenser in contact with the sample shall be made of glass, PTFE or stainless steel, etc., and its capacity shall match the sampling gas flow rate and the concentration of water vapor. The dew point temperature of flue gas at the outlet of condenser or penetration dryer shall be below ambient temperature, and the cooling temperature should be between 2℃ and 5℃, and condensate shall be recovered quickly to reduce contact with the sample. Desiccant shall not be used.
When penetration drying method is used, one-half of the dryer tube shall be heated to at least 15 K above the gas dew point, and it shall meet the manufacturer's requirements for purging air.
4.3.3 Filter
Filter shall be installed between the condenser and the distributor, and the material in contact with the sample shall be of stainless steel or glass. The size of the filter shall be determined based on the sampling gas flow and the flow data per unit area provided by the manufacturer. The filter diameter of the filter shall not be greater than 1μm, and the contamination on the filter shall be prevented from reacting with gas.
4.3.4 Distributor
The distributor shall be made of stainless steel or PTFE, and the volume shall be as small as possible, and the upper flow limit shall ensure the sample flow required for each analyzer. Each analyzer shall be able to connect with distributor independently, and shall have a discharge system to the outside.
