GB/T 32151.11-2026Requirements for greenhouse gas emission accounting and reporting - Part 11: Coal production enterprises (English PDF)

4.2 Scope of Accounting and Reporting

4.2.1 Emissions from fossil fuel combustion Carbon dioxide emissions are generated from the complete combustion of fossil fuels with oxygen in various types of stationary or mobile combustion equipment.

4.2.2 Methane Emissions This includes methane emissions from underground coal mining, open-pit mining, and post-mining activities.

4.2.3 Carbon dioxide fugitive emissions Carbon dioxide emissions from underground coal mining.

4.2.4 Recycling, Utilization and Disposal This includes the recovery and utilization of coalbed methane (coal mine gas) through gas power generation, gas heating, gas enrichment, other conversion methods, and external sales. The greenhouse gas emissions from methods such as flare combustion and methane destruction (flameless oxidation, etc.) are calculated, deducting the amount of methane recovered and utilized. Alkane destruction amount.

4.2.5 Emissions from purchased electricity and heat Carbon dioxide emissions generated during the production process corresponding to the electricity and heat purchased by the enterprise.

4.2.6 Emissions generated from the output of electricity and heat Carbon dioxide emissions generated during the production process corresponding to the electricity and heat output by enterprises.

5.2 Measurement and Monitoring of Emissions from Fossil Fuel Combustion

5.2.1 Measurement and monitoring of fossil fuel consumption Coal production enterprises should be equipped with fossil fuel metering instruments in accordance with the provisions of GB 17167.

5.2.2 Low heating value detection Enterprises should determine total moisture according to GB/T 211, and determine air-dried basis moisture according to GB/T 212 or GB/T 30732. GB/T 213 determines the calorific value of the bomb cartridge; GB/T 476 or GB/T 30733 determines the hydrogen content, and the lower heating value is calculated accordingly. Each batch The monthly carbon content and lower heating value of the coal delivered to the plant were calculated by weighting the test data of each batch, with the weight being the amount of coal in each batch, and then compared with the corresponding... The consumption status should remain consistent. The lower heating value of fuel oil and natural gas should comply with GB/T 384, GB/T 11062, and GB/T 12206. Tested according to GB/T 22723 and GB/T 12208.

5.3 Measurement and Monitoring of Methane Emissions Methane emissions should be calculated using the measured method first. If measured data is unavailable, the emission factor method can be used. Emission factor method. Methane emissions should be based on coal production multiplied by an emission factor. Coal production should be based on statistical data or ledger records. The selection of emission factors should be based on typical sample testing reports and gas level identification reports conducted by the reporting entity, or refer to the default values recommended in this document. Calculations and reports must be performed, and emission factor monitoring methods must comply with relevant standards. Coal production should be calculated using methods conforming to GB/T 23111. Weighing instruments. Actual measurement method. Methane emissions include the total methane emissions from extraction and ventilation systems. This includes underground mining operations (extraction and ventilation systems). The measuring instruments for the flow rate of methane emissions shall comply with the requirements of GB 17167, and the measuring instruments for the gas components shall comply with the requirements of GB 17167. The provisions of AQ6204, NB/T 10182, or JJG1138 shall apply.

5.4 Measurement and Monitoring of Carbon Dioxide Emissions Carbon dioxide emissions should be based on coal production output of coal-producing enterprises multiplied by the emission factor, and coal production output should be based on statistical data or ledgers. Records and emission factor selection should be based on calculations using typical sample carbon dioxide testing reports or gas level assessment reports conducted by the reporting entity. The report also states that the methods for monitoring carbon dioxide emission factors should comply with relevant standards. Coal production should be measured using methods that meet the requirements of GB/T 23111. Weighing instruments.

5.5 Measurement of Recycling, Utilization and Disposal

5.5.1 Methane recycling and disposal generate carbon dioxide emissions. Coalbed methane (coal mine gas) can be recovered and utilized (e.g., for gas power generation, gas heating), as well as through flare combustion and methane destruction (flameless oxygen combustion). Measuring instruments for measuring the volume of carbon dioxide emissions generated by methane destruction methods (such as chemical combustion) shall comply with the requirements of GB 17167 and GB/T 32201. The measuring instruments for gas components shall comply with the requirements of AQ6204, NB/T 10182, JJG1138 or GB/T 30431. Detection of lower heating value of coalbed methane (coal mine gas). Enterprises should conduct tests on each source in accordance with GB/T 384, GB/T 11062, and GB/T 12206. The low calorific value was detected.

5.5.2 Methane recovery, utilization, and disposal volume Measuring instruments for the amount of methane recovered, utilized, and destroyed shall comply with the provisions of GB 17167.

5.6 Metering and monitoring of purchased and exported electricity and heat Enterprises should equip themselves with electricity meters and heat metering instruments in accordance with the requirements of GB 17167.

5.7 Metrology and Monitoring Management Enterprises should strengthen the management of metrological monitoring and testing related to greenhouse gas emissions, including but not limited to the following provisions.

a) Designate personnel to be responsible for the management of energy metering instruments, including their allocation, use, verification (calibration), maintenance, and disposal. Management work, etc.

b) Enterprise greenhouse gas emission measurement management personnel, verification, calibration, maintenance and related management of greenhouse gas emission-related measuring instruments. The personnel possess the corresponding abilities.

c) Establish a list of measuring instruments. List the name, specifications, accuracy class, manufacturer, serial number, and other details of each measuring instrument. Unit management number, installation and usage location, status (i.e., qualified, approved, or discontinued).

d) The design and installation of energy-consuming equipment comply with the energy monitoring requirements for energy-consuming equipment in GB/T 6422 and GB/T 15316.

e) Establish a record of greenhouse gas emission-related measuring instruments, including but not limited to. 1) Instruction manual for measuring instruments; 2) Certificate of conformity for the measuring instrument; 3) Valid verification (testing, calibration) certificate for the measuring instrument; 4) Measuring instrument maintenance records.

f) For measuring instruments that are self-calibrated and have self-defined calibration intervals, there are currently valid controlled documents as the basis.

g) Measuring instruments shall be periodically verified (calibrated). Measuring instruments that fail verification (calibration) or exceed their verification period shall not be used. For measuring instruments subject to mandatory verification, the verification cycle shall comply with the relevant metrology laws and regulations.

h) Labels corresponding to the numbers in the measuring instruments list should be affixed to the measuring instruments in a conspicuous location for inspection and management.

6.2 Accounting Method

6.2.1 Overview The total greenhouse gas emissions from coal production enterprises equal the emissions from fossil fuel combustion, methane emissions, carbon dioxide emissions, and recycled emissions. The sum of greenhouse gas emissions from collection, utilization, and destruction, and emissions corresponding to purchased electricity and heat, minus emissions corresponding to exported electricity and heat. Calculate according to formula (1).

6.2.2 Emissions from fossil fuel combustion

6.2.2.1 Calculation Formula The carbon dioxide emissions from fossil fuel combustion in the report are the sum of the carbon dioxide emissions from various fossil fuel combustions during the enterprise's accounting period. And, calculated according to formula (2).

6.2.2.2 Activity Data Acquisition Fossil fuel consumption should be determined based on enterprise production records, ledgers, or statistical reports. Fossil fuel consumption refers to the consumption of various combustion equipment. The amount of fossil fuel fed into the furnace should be measured in accordance with the relevant provisions in Table

1.Enterprises should retain original data records of the amount of fossil fuel fed into the furnace. The data for this activity should be reflected in the company's energy consumption ledger or statistical report.

6.2.2.3 Emission Factor Data Acquisition 6.2.2.3.1 Carbon content of fossil fuels Enterprises should monitor and obtain the carbon content of fossil fuels according to their own monitoring capabilities and conditions, using the following methods.

a) The carbon content of the fuel shall be tested regularly by a qualified professional organization, in accordance with the relevant requirements in Table 1 or GB/T 474. Standards such as GB/T 476, GB/T 8984, GB/T 13610, GB/T 30733, and SH/T 0656, among others, address different types of coal. Gases such as natural gas and gaseous fuels undergo gas composition testing at least once per batch upon arrival at the plant or every six months, and then the testing is conducted according to the specific requirements of each batch. The volume fraction of each gaseous component and the number of carbon atoms in the chemical formula of that component are used to calculate the carbon content according to formula (3), and the calculation is performed accordingly. The technical average value is used as the carbon content of the gaseous fuel. However, if the carbon content of a certain fuel varies greatly, at least monthly... A single test is conducted, and the carbon content of the fuel is calculated by weighting the monthly consumption. 6.2.2.3.2 Carbon Oxidation Rate of Fossil Fuels The fuel carbon oxidation rate can be referenced from the default values in Table C.1.

6.2.3 Methane Emissions

6.2.3.1 Total methane emissions The total methane emissions from coal production enterprises are calculated according to formula (5).

6.2.3.2 Methane Emissions from Underground Mining 6.2.3.2.1 Overview Methane emissions from underground coal mining operations refer to the emissions from underground mining that are released into the atmosphere through ventilation and extraction systems. The amount of methane emitted during mining operations. The calculation of methane emissions from underground coal mining enterprises should preferably use the measured method to obtain methane emission data. For statistical accounting, if underground mining companies do not have the relevant methane monitoring conditions, the emission factor method can also be used to calculate methane emissions. Measurement method. By monitoring and obtaining data such as the concentration and flow rate of methane emitted into the atmosphere from ventilation and extraction systems, the methane emission can be directly calculated. Dispersed emissions. Emission factor method. Calculated based on coal production and the corresponding average methane emission factor. 6.2.3.2.2 Actual Measurement Method The methane emissions from underground coal mining operations consist of methane emissions from underground mining ventilation and methane emissions from extraction systems. The sum of emissions. Calculated according to formula (6). 6.2.3.2.3 Emission Factor Method The emission factor method can also be used to calculate methane emissions from underground mining operations. The methane emission amount is calculated according to formula (11).

6.2.3.3 Methane Emissions from Open-Pit Mining 6.2.3.3.1 Calculation Formula The amount of methane emitted from open-pit mining is calculated according to formula (12). 6.2.3.3.2 Acquisition of Emission Factor Data Enterprises should prioritize using measured methane emission factors from open-pit coal mines. If measured data is unavailable, enterprises may use the default value. For coal mines with an average overburden depth of less than 25m, the default value is [value to be filled in].

0.3 Nm^3/t; for coal mines with overburden depth exceeding 50 m, the default value is

1.9 Nm^3/t; for intermediate depths or where information on overburden thickness is unavailable... For coal mines with specific temperature data, the default value is

6.2.3.4 Methane Emissions from Post-Mining Activities 6.2.3.4.1 Calculation Formula The amount of methane emitted from post-mining activities is calculated according to formula (13). 6.2.3.4.2 Acquisition of Emission Factor Data Enterprises should prioritize using measured methane emission factors from post-mining activities. Measurements of methane emission factors from post-mining activities should be conducted every normal production month. Choose any production shift on a given day and take a coal sample from the main shaft conveyor belt. Take 3 to 6 parallel samples each time, and keep the density of each group of parallel samples high. The samples should be sealed and stored for six months to facilitate retesting in case of significant data fluctuations. Post-mine coal sampling can be conducted in accordance with GB/T 19559 or NB/T 11329. Samples of residual gas were sent for testing or self-testing to obtain measured data on post-mine activity emission factors. The arithmetic operations of all measured data were then performed. The average value is used as the emission factor for post-mine activities of coal production enterprises within the accounting period. If measured data is unavailable, enterprises may use the default values. The methane emission factor for post-mining activities in outburst-prone and high-gas mines is missing. The provincial value is

2.8 Nm3/t, the default emission factor for low-gas mines is

0.88 Nm3/t, and the default emission factor for open-pit coal mines is

0.1 Nm3/t. Post-mining activities related to methane emissions in this document can be reported separately. Reporting information can be found in Tables 7 and 8 of the report format template in Appendix B.

6.2.4 Carbon dioxide fugitive emissions

6.2.4.1 Calculation Formula The total emissions of carbon dioxide are calculated according to formula (14).

6.2.4.2 Acquisition of Emission Factor Data Enterprises should prioritize using carbon dioxide emission factors measured from actual well drilling. If no actual measurement is available, the relative carbon dioxide emission rate of a mine can be directly obtained from the gas level assessment results of that year. If a mine... If no gas/carbon dioxide rating assessment was conducted during the accounting and reporting period, its relative carbon dioxide level can be determined based on the assessment results of the most recent year. Carbon emission. If the mine is not a carbon dioxide outburst mine, the carbon dioxide emissions from its underground mining operations can be ignored.

6.2.5 Recycling, Utilization and Disposal

6.2.5.1 Total greenhouse gas emissions from methane recovery, utilization, and destruction The total greenhouse gas emissions from methane recovery, utilization, and destruction by coal production enterprises include greenhouse gases generated during the methane recovery and utilization process. The greenhouse gas emissions generated during the methane destruction process are calculated using formula (15). E recycling and destruction = E recycling and destruction_CO2 - E recycling and destruction_CH4 (15) Methane Recycling and Destruction - Total greenhouse gas emissions from methane recycling, utilization, and destruction, expressed in tons of carbon dioxide equivalent (tCO2e); E Recycling and Destruction of CO2