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GB/T 40370-2021Calculation methods for the energy consumption index of gas-steam combined cycle cogeneration (English PDF)

燃气-蒸汽联合循环热电联产能耗指标计算方法

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

August 20, 2021

Implementation date

March 1, 2022

Scope

GB/T 40370-2021 is the English-translated version of 燃气-蒸汽联合循环热电联产能耗指标计算方法.

China's national calculation methods for the energy consumption indices of gas-steam combined cycle cogeneration plants. It specifies the terms and definitions and the method of allocating energy. The allocation problem is the whole subject. A combined cycle plant burns gas in a turbine, recovers the exhaust heat to raise steam, and runs a steam turbine on that; a cogeneration plant additionally extracts steam for heating or process use. So one fuel input produces two useful outputs of quite different quality, and the efficiency of neither is defined until the fuel has been divided between them. Different allocation conventions - by energy content, by exergy, by the fuel each output would have needed separately - give substantially different answers for the same plant, and every one of them can be defended. Fixing the convention nationally is what makes the reported efficiency of two plants comparable, and what stops a plant choosing the method that flatters it.

Document preview — GB/T 40370-2021

National Standard of the People's Republic of China

Classification: K 56

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

ForewordIII
1 Scope1
2 Terms and definitions1
3 Calculation method of energy allocation2
3.1 General2
3.2 Calorimetry3
3.3 Thermal union method4
3.4 Actual enthalpy drop method5
4 Calculation of other indicators6
Appendix A (informative appendix) Explanation of heat combination method9
Appendix B (informative appendix) Typical industrial extraction gas-steam combined cycle cogeneration energy consumption calculation example11
Appendix C (informative appendix) Typical heating extraction gas-steam combined cycle cogeneration energy consumption calculation example13
Appendix D (informative appendix) Symbol summary15
Reference17

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard was proposed by the China Machinery Industry Federation.

This standard is under the jurisdiction of the National Gas Turbine Standardization Technical Committee (SAC/TC259).

Drafting organizations of this standard. China Energy Construction Group Zhejiang Electric Power Design Institute Co., Ltd., Hangzhou Huadian Xiasha Thermal Power Co., Ltd., China

China Power Engineering Consulting Group East China Electric Power Design Institute Co., Ltd., China Power Engineering Consulting Group Northwest Electric Power Design Institute Co., Ltd., China

Power Engineering Consulting Group North China Electric Power Design Institute Co., Ltd., Nanjing Gas Turbine Research Institute, Zhejiang Guohua Yuyao Gas Power Generation Co., Ltd.

The main drafters of this standard. Shen Youxing, Guangxu, Zhu Da, Chen Xuming, Zhu Ruili, Ma Xinqiang, Chen Yingzhan, Duan Liping, Zhu Bengang, Han Jianqing.

Gas-steam combined cycle cogeneration

Energy consumption index calculation method

1 Scope

This standard establishes the general principle of reasonable electric and heat apportionment for gas-steam combined cycle heat and power generation, and specifies the calculation of energy consumption indicators method.

This standard applies to the calculation of energy consumption indicators for heating conditions of gas-steam combined cycle cogeneration units without supplementary combustion.

2 Terms and definitions

The following terms and definitions apply to this document.

2.1 Total input heat consumption combinedcycleheatconsumption

The total heat input through fuel combustion in the gas-steam combined cycle during the statistical period.

2.2 Heat consumption for heatsupply

The calories consumed by external heating during the statistical period.

2.3 Heating cost allocation ratio costalocationforheatsupply

During the statistical period, the cost of heating consumption accounted for the proportion of the total cost.

2.4 Combustion chamber exit combustionchamberexhuastexergy

The effective energy of the flue gas output by the combustion chamber during the statistical period.

2.5 Aircompressorexergyconsumption

The effective energy consumed to drive the compressor during the statistical period.

2.6 The waste heat boiler receives exergyacquired by HRSG

The effective energy that enters the waste heat boiler to provide downstream circulation during the statistical period.

2.7 Upstream gasturbineexergyconsumption

The effective energy on the upstream side of the combined cycle (before the gas turbine exhaust vent, except for the compressor) during the statistical period.

2.8 Exergy ratio for the downstream side

During the statistical period, the effective energy on the downstream side of the combined cycle (after the gas turbine exhaust port) accounts for the percentage of the entire cycle.

2.9 Heat supply ratio heatconsumptionfraction

The ratio of the heat consumed by heating to the total heat output of the waste heat boiler during the statistical period.

Remaining clauses in the full document

3 Calculation method of energy allocation
4 Calculation of other indicators

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 20 pages — is available in the English PDF.

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