An Improved Calculation Method of Coal Consumption Index for Heating in CHP with a High Back Pressure Turbine

CHP (combined heating and power) system is playing an important role for district heating, meanwhile, the latent heat of exhausted steam at the thermal power plant is discharged to atmosphere directly, which is often more than 30%. Waste heat recovery is of great significance for reducing coal consu...

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Bibliographic Details
Published in:IOP conference series. Earth and environmental science 2021-02, Vol.661 (1), p.12017
Main Authors: Sun, Jian, Ma, Shicai, Huo, Cheng, Ge, Zhihua, Zhou, Shaoxiang
Format: Article
Language:English
Subjects:
CHP
Coal consumption index
District heating
Double rotor
High back pressure
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Summary:CHP (combined heating and power) system is playing an important role for district heating, meanwhile, the latent heat of exhausted steam at the thermal power plant is discharged to atmosphere directly, which is often more than 30%. Waste heat recovery is of great significance for reducing coal consumption indicators for heating in CHP system. The method by replacing different rotors of the LP (low pressure) cylinder is presented and experimented with a 140MW turbine, whose exhausted steam could be recovered completely. Besides, an improved calculation method of coal consumption index for heating is discussed. The improved mathematical model is used to calculate the influence of exhaust pressure on steam turbine power generation efficiency, which improves the accuracy of heating coal consumption. This experimented coal consumption index for heating is 12.7 kgce/GJ, which is much lower than the traditional CHP system (20 kgce/GJ).
ISSN:1755-1307
1755-1315
DOI:10.1088/1755-1315/661/1/012017