Steam-Water Modelling and the Coal-Saving Scheduling Strategy of Combined Heat and Power Systems

Junshan Guo, Wei Zheng, Zhuang Cong, Panfeng Shang, Congyu Wang and Jiwei Song
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Junshan Guo: Zhongshi Yitong Group, Jinan 250003, China
Wei Zheng: State Grid Shandong Electric Power Research Institute, Jinan 250003, China
Zhuang Cong: Zhongshi Yitong Group, Jinan 250003, China
Panfeng Shang: State Grid Shandong Electric Power Research Institute, Jinan 250003, China
Congyu Wang: Institute of Thermal Science and Technology, Shandong University, Jinan 250061, China
Jiwei Song: Institute of Thermal Science and Technology, Shandong University, Jinan 250061, China

Energies, 2021, vol. 15, issue 1, 1-16

Abstract: China aims to peak carbon emissions by 2030. As a result, small-scale coal-fired combined heat and power (CHP) units and self-provided units are gradually shut down, and large-scale coal-fired CHP units are a solution to undertake the industrial heat loads. From the perspective of the industrial heat load allocation during the non-heating season, the problems regarding the coal-saving scheduling strategy of coal-fired CHP units are addressed. The steam-water equations of CHP units are established to analyze the heat-power coupling characteristics. The energy utilization efficiency, exergy efficiency and the coal consumption are analyzed. The optimization model of saving coal consumption is established and the adaptive mutation particle swarm optimization (AMPSO) is introduced to solve the above model. The 330 MW coal-fired CHP unit is taken as an example, and the results show that for the constant main flow rate, each increase of 1 t/h industrial steam extraction will reduce the power output by about 0.321 MW. The energy utilization efficiency and the exergy are mainly influenced by industrial steam supply and the power load, respectively. For the CHP system with two parallel CHP units, the unequal allocation of industrial heat load between two units saves more coal than equal allocation. The coal consumption can be reduced when the unit with lower power load undertakes more industrial heat load. In the typical day, the total coal consumption after optimization is 3203.92 tons, a decrease of 14.66 tons compared to the optimization before. The two CHP units in the case can benefit about 5,612,700 CHY extra in one year.

Keywords: combined heat and power; steam-water equation; load optimal allocation; particle swarm algorithm (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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