Comprehensive energy efficiency analysis of multiple ultra-supercritical units and load distribution strategy

ZHANG Haifeng; LIU Qingtong; CHEN Guoqing; YIN Ge; GAO Xinglong; ZHOU Xiaoming

doi:10.19944/j.eptep.1674-8069.2026.04.007

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Comprehensive energy efficiency analysis of multiple ultra-supercritical units and load distribution strategy

New\-generation flexibility control technologies for coal\-fired power plants | 更新时间：2026-10-14

- Comprehensive energy efficiency analysis of multiple ultra-supercritical units and load distribution strategy
- Electric Power Technology and Environmental Protection Vol. 42, Issue 4, Pages: 582-590(2026)
- 作者机构：
  
  1.国能常州第二发电有限公司，江苏常州 213001
  2.河海大学机电工程学院，江苏常州 213022
  3.低碳智能燃煤发电与超净排放全国重点实验室（国家能源集团科学技术研究院有限公司），江苏南京 210023
  4.河海大学电气与动力工程学院，江苏南京 211100
- 作者简介：
- 基金信息：
- DOI：10.19944/j.eptep.1674-8069.2026.04.007
  CLC： TK11+5
- Received：30 June 2025，
  
  Accepted：30 September 2025，
  
  Published：15 August 2026
- 稿件说明：
移动端阅览
张海峰,刘庆同,陈国庆，等.多台超超临界机组负荷分配及其综合能效分析[J].电力科技与环保,2026,42(4):582-590.

ZHANG Haifeng, LIU Qingtong, CHEN Guoqing, et al. Comprehensive energy efficiency analysis of multiple ultra-supercritical units and load distribution strategy[J]. Electric Power Technology and Environmental Protection, 2026, 42(4):582-590.
张海峰,刘庆同,陈国庆，等.多台超超临界机组负荷分配及其综合能效分析[J].电力科技与环保,2026,42(4):582-590. DOI： 10.19944/j.eptep.1674-8069.2026.04.007.

ZHANG Haifeng, LIU Qingtong, CHEN Guoqing, et al. Comprehensive energy efficiency analysis of multiple ultra-supercritical units and load distribution strategy[J]. Electric Power Technology and Environmental Protection, 2026, 42(4):582-590. DOI： 10.19944/j.eptep.1674-8069.2026.04.007.

摘要

目的

燃煤电厂厂级电负荷分配方式影响其经济性，为揭示某电厂多台超超临界机组能效特性的差异及电负荷分配对全厂经济性的影响，提出最优电负荷分配策略，以实现全厂运行节能增效。

方法

本文以某电厂一期2×1 000 MW超超临界一次再热机组和二期2×1 000 MW超超临界二次再热机组为对象，基于Ebsilon软件平台建立一、二期机组的热力系统模型，模拟纯凝工况下以5%为步长、30% THA~100% THA共15个负荷点时，一、二期机组的煤耗及热耗率变化规律。

结果

研究表明，在电负荷为300 MW至1 000 MW之间，一期机组煤耗率区间为277.1~310.9 g/（kW·h），最大差值为33.8 g/（kW·h）；而二期机组煤耗率区间为266.8~297.6 g/（kW·h），最大差值为30.8 g/（kW·h）。低负荷时，单位电负荷变化对煤耗率的影响更显著。一期机组在低负荷下煤耗率降幅更大；高负荷时，二期机组经济性更优，2 200 MW总负荷下，一期多带负荷方案热耗率较二期低30.26 kJ/（kW·h）。

结论

机组负荷分配需动态优化，总负荷较低时优先由一期机组承担，随着总负荷升高需逐步增加二期机组负荷比例，高负荷时段由二期机组主导，可显著降低全厂煤耗。

Abstract

Objective

The plant-level electric load distribution mode of coal-fired power plant affects its economy. In order to reveal the difference of energy efficiency characteristics of multiple ultra-supercritical units in a power plant and the influence of electric load distribution on the economy of the whole plant

the optimal electric load distribution strategy is proposed to realize the energy saving and efficiency increase of the whole plant operation.

Methods

In this paper

the 2 × 1 000 MW ultra-supercritical single-reheat unit in the first phase and the 2 × 1 000 MW ultra-supercritical double-reheat unit in the second phase of a power plant are taken as the object. Based on the Ebsilon software platform

the thermal system models of the first and second phase units are established. The variation of coal consumption and heat consumption rate of the first and second phase units is simulated under the condition of pure condensation with 5 % step size and 30%THA ~ 100%THA

a total of 15 load points.

Results

The results show that when the electric load is between 300 MW and 1 000 MW

the coal consumption rate of the first stage unit is 277.1 ~ 310.9 g/(kW·h)

and the maximum difference is 33.8 g/(kW·h). The coal consumption rate of the second phase unit is 266.8 ~ 297.6 g/(kW·h)

and the maximum difference is 30.8 g/(kW·h). At low load

the influence of unit electric load change on coal consumption rate is more significant. The coal consumption rate of the first-stage unit decreases more under low load ; under high load

the economy of the second-stage unit is better. Under the total load of 2 200 MW

the heat consumption rate of the first-stage multi-load scheme is 30.26 kJ/(kW·h) lower than that of the second-stage.

Conclusion

The load distribution of the unit needs to be dynamically optimized. When the total load is low

it is preferentially borne by the first-stage unit. As the total load increases

the load ratio of the second-stage unit needs to be gradually increased. The high-load period is dominated by the second-stage unit

which can significantly reduce the coal consumption of the whole plant.

关键词

Keywords

references

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