Impact of Heat Storage on Coal Consumption of Supercritical Thermal Power Units Under Deep Peak Shaving

CHENG Shan; FU Yi; ZHANG Huang; WANG Zhijie; CHEN Wen; TIAN Hong

doi:10.19805/j.cnki.jcspe.2025.240475

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Impact of Heat Storage on Coal Consumption of Supercritical Thermal Power Units Under Deep Peak Shaving

更新时间：2026-10-10

- Impact of Heat Storage on Coal Consumption of Supercritical Thermal Power Units Under Deep Peak Shaving
- Chinese Journal of Power Engineering Vol. 45, Issue 9, Pages: 1345-1353(2025)
- 作者机构：
  
  1. 长沙理工大学能源与动力工程学院,湖南,长沙,410114
  2. 国网湖南电力有限公司,湖南,长沙,410000
- 作者简介：
- 基金信息：
- DOI：10.19805/j.cnki.jcspe.2025.240475
  CLC：
- Online First：16 September 2025，
  
  Published：2025
- 稿件说明：
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成珊,付毅,张煌,王志杰,陈文,田红. 深度调峰下超临界火电机组蓄热量对煤耗的影响动力工程学报, 2025, 45(9): 1345-1353 https://doi.

org/10.19805/j.cnki.jcspe.2025.240475
成珊,付毅,张煌,王志杰,陈文,田红. 深度调峰下超临界火电机组蓄热量对煤耗的影响动力工程学报, 2025, 45(9): 1345-1353 https://doi. DOI： 10.19805/j.cnki.jcspe.2025.240475.

org/10.19805/j.cnki.jcspe.2025.240475 DOI：

摘要

为探究深度调峰超临界直流锅炉火电机组蓄热量对机组供电煤耗的影响

基于机组稳态与非稳态下不同的运行特征

计算了不同工况下锅炉各汽水流程部件的实际蓄热系数

并基于机组实际运行数据计算得到机组供电煤耗

研究了机组实际蓄热系数对供电标准煤耗的影响。以某660 MW超临界机组为例开展了分析。结果表明:在稳态与非稳态下

当机组从100%汽轮机额定负荷工况(THA)降低到30%THA时

金属蓄热系数分别增大135.47%和133.93%

汽水蓄热系数变化不大

实际蓄热系数分别增大80.83%和80.07%

且非稳态下机组的各项蓄热系数均大于稳态时;非稳态下机组供电标准煤耗比稳态时增加了11.76~22.40 g/(kW·h);机组向上调峰过程中实际蓄热系数和供电煤耗均大于向下调峰过程;机组供电煤耗与实际蓄热系数呈强相关性

且随着实际蓄热系数的增大而增大。

Abstract

To study the impact of heat storage on the coal consumption of power supply of supercritical thermal power units under deep peak shaving

the actual heat storage coefficients of the steam-water process components of the boilers under various operating conditions were calculated based on the operating characteristics of the units at steady state and non-steady state. Based on the actual operating data of the unit

the coal consumption for power supply was calculated

and the influence of actual heat storage coefficients of units on the standard coal consumption of power supply was investigated. Taking a 660 MW supercritical unit as an example. Results show that when the unit load reduces from 100% to 30% at steady state and non-steady state

the metal heat storage coefficient increases by 135.47% and 133.93%

respectively

while the steam and water heat storage coefficients change little

with actual thermal storage coefficients increasing by 80.83% and 80.07% respectively. Moreover

the heat storage coefficients of the unit at non-steady state are greater than those at steady state. The standard coal consumption of power supply at non-steady state increases by 11.76-22.40 g/(kW·h) compared with that at steady state. The actual heat storage coefficient and coal consumption of the unit during the upward peak shaving are greater than that during the downward peak shaving. The unit coal consumption of power supply and the actual heat storage coefficient show a strong correlation

and the former increases with the increment of the actual heat storage coefficient.

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references

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