Overall energy efficiency and flexibility retrofit scheme analysis of heat-power integrated energy system

HU Kang; CHEN Qun

doi:10.19666/j.rlfd.201803036

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Overall energy efficiency and flexibility retrofit scheme analysis of heat-power integrated energy system

更新时间：2025-09-28

- Overall energy efficiency and flexibility retrofit scheme analysis of heat-power integrated energy system
- Thermal Power Generation Vol. 47, Issue 5, Pages: 14-21(2018)
- 作者机构：
  
  清华大学航天航空学院工程热物理研究所
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.201803036
  CLC： TE01+9
- Published Online：03 May 2018，
  
  Published：2018
- 稿件说明：
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HU Kang, CHEN Qun. Overall energy efficiency and flexibility retrofit scheme analysis of heat-power integrated energy system[J]. Thermal power generation, 2018, 47(5): 14-21.
DOI：

HU Kang, CHEN Qun. Overall energy efficiency and flexibility retrofit scheme analysis of heat-power integrated energy system[J]. Thermal power generation, 2018, 47(5): 14-21. DOI： 10.19666/j.rlfd.201803036.

摘要

热电联产技术提高了电厂的能源利用效率

却也制约了热电机组的电出力调节能力

限制了电力系统的灵活性

阻碍了可再生能源的大规模接入

造成了严重的弃风问题。本文以系统煤耗总量为主要参考

分析了热电联产对系统整体效率的影响

并比较了电加热储热、电热泵制热、热电机组储热、汽轮机高/中压旁路抽汽供热4种灵活性改造方案的效果。结果表明:热电联产是否提升能源系统的整体利用效率取决于电能、热能的供需情况;现阶段高比例的热电联产机组

在"以热定电"的运行模式下

限制了系统整体效率;汽轮机高/中压旁路抽汽供热方案应用限制较少

能够有效提升热电机组调节能力

是最优灵活性改造方案。

Abstract

The technology of the combined heat and power(CHP) improves the energy utilization efficiency of units. However

this technology also restricts the adjustability of the power generation

limits the flexibility of the power system

hinders the introduction of large-scale renewable energy

and causes serious curtailment of wind power. Taking the total coal consumption of the system as the main reference

this study discusses the influence of CHP on the overall energy efficiency of the system

and compares the effects of four kinds of flexibility retrofit schemes: heat storage by electric heating

electric heat pump heating

heat storage by CHP unit

and extraction heating by high/medium pressure bypass of turbine. The results show that whether CHP improves the overall energy utilization efficiency of the energy system depends on the supply and demand condition of power and heat in the system. At the present

a high proportion of the CHP units

which are operated in the "heat-led" mode

have limited the overall energy utilization efficiency of the system. Extraction heating scheme by high/medium pressure bypass of turbine has less limitations and can improve the adjustability of the CHP unit effectively

which is the optimal flexibility retrofit scheme.

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