Analytical Study of the Minimum Output and Coal Consumption of Units Under the Background of the Next-generation Coal-fired Power Generation

MA Dafu; MA Yuanli; LIN Xiaozhen; FAN Chenghao; ZHOU Wentai; LÜ Xiaodong; ZHANG Shouyu; LIU Pingyuan; LÜ Junfu

doi:10.19805/j.cnki.jcspe.2026.250439

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Analytical Study of the Minimum Output and Coal Consumption of Units Under the Background of the Next-generation Coal-fired Power Generation

更新时间：2026-07-16

- Analytical Study of the Minimum Output and Coal Consumption of Units Under the Background of the Next-generation Coal-fired Power Generation
- Chinese Journal of Power Engineering Vol. 46, Issue 7, Pages: 193-204(2026)
- 作者机构：
  
  1. 上海发电设备成套设计研究院有限责任公司,上海,200240
  2. 青海桥头发电有限责任公司,青海,西宁,810100
  3. 上海理工大学能源与动力工程学院,上海,200093
  4. 清华大学能源与动力工程系,北京,100084
- 作者简介：
- 基金信息：
- DOI：10.19805/j.cnki.jcspe.2026.250439
  CLC： TM621
- Published：2026
- 稿件说明：
移动端阅览
马达夫, 马元礼, 林晓真, 范诚豪, 周文台, 吕晓东, 张守玉, 刘平元, 吕俊复. 新一代煤电背景下机组最小出力与煤耗的分析研究[J]. 动力工程学报, 2026, 46(7): 193-204.
马达夫, 马元礼, 林晓真, 范诚豪, 周文台, 吕晓东, 张守玉, 刘平元, 吕俊复. 新一代煤电背景下机组最小出力与煤耗的分析研究[J]. 动力工程学报, 2026, 46(7): 193-204. DOI： 10.19805/j.cnki.jcspe.2026.250439.

DOI： 10.19805/j.cnki.jcspe.2026.250439

摘要

新型电力系统和新一代煤电概念的提出

预示着先进的煤电机组将基于15%~20%负荷进行设计和运行

因此其所能达到的最小出力和低负荷下的能耗是核心问题。针对以上两个问题

分析和研究了机组深度调峰的瓶颈及影响因素、现役和新建机组的最小出力、现役机组深度调峰下的煤耗以及新一代煤电机组的优化设计等。结果表明:管壁超温及金属疲劳损伤加剧、燃烧稳定性差和脱硝设备压力大是低负荷深度调峰危险性指数最高的3个问题;在20%~35%负荷区间内

300 MW和660~1 000 MW等级机组供电煤耗增加率分别为每%负荷2.6和9.2 g/(kW·h);由于湿态运行、燃料和工质并未等比例下降以及厂用电率升高等原因

某660 MW超超临界机组在15%~20%负荷下供电煤耗增加率高达每%负荷 31.2 g/(kW·h);对于容量≥600 MW的煤电机组

熔盐储热系统吸热过程中

原最小出力为20%和30%负荷的机组出力可相对分别减少20%和53%;建议机组在15%~20%负荷下仍保持干态运行

若需湿态运行则可通过减少给水量并采用循环泵系统

以降低煤耗;尽量采用300 MW等级机组进行超低负荷下的深度调峰。

Abstract

concept of the new electric power system and the new generation of coal power indicate that the advanced coal power units will be designed and operated based on 15%-20% load

so the minimum output and energy consumption under low loads are the core issues. In view of the above two problems

the bottleneck and influencing factors of units under deep peak shaving

the minimum output of existing and newly built units

the coal consumption under deep peak shaving of existing units

and the optimal design of the next-generation coal-fired power generation were analyzed and studied. Results show that the overtemperature of the pipe wall and metal fatigue damage

poor combustion stability

and high pressure of denitration equipment occupied the highest three risk indexes of low load deep peak shaving. In the 20%-35% load range

the coal consumption increase ratio of 300 MW and 660-1 000 MW units is 2.6 and 9.2 g/(kW·h) each percentage load

respectively. The coal consumption of a 660 MW ultra-supercritical unit at 15%-20% load increases by 31.2 g/(kW·h) each percentage load due to such as wet operation

disproportionate decreases for fuel and working medium flow rate

and the increased plant electricity consumption rate. For coal power units with capacity ≥600 MW

in the heat absorption process of molten salt heat storage system

the original minimum output of 20% and 30% load units can be reduced by 20% and 53%

respectively. It is suggested that the unit maintain dry operation under 15%-20% load

and reduce coal consumption by reducing water supply and adopting circulating pump system if wet operation is required. The 300 MW unit should be used as far as possible for deep peak regulation under ultra-low load.

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