Influence of Water and Coal Disturbance on Dynamic Characteristics of Subcritical Power Unit and Spatiotemporal Distribution Characteristics of Heat Storage in the System

LIU Yi; CHEN Chen; RAN Shenming; WANG Chaoyang; LIU Ming; YAN Junjie

doi:10.19805/j.cnki.jcspe.2025.240319

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Influence of Water and Coal Disturbance on Dynamic Characteristics of Subcritical Power Unit and Spatiotemporal Distribution Characteristics of Heat Storage in the System

更新时间：2026-10-10

- Influence of Water and Coal Disturbance on Dynamic Characteristics of Subcritical Power Unit and Spatiotemporal Distribution Characteristics of Heat Storage in the System
- Chinese Journal of Power Engineering Vol. 45, Issue 8, Pages: 1278-1289(2025)
- 作者机构：
  
  1. 东方电气集团东方锅炉股份有限公司,四川,自贡,643001
  2. 能源清洁低碳热转化利用技术与装备四川省重点实验室,四川,成都,611731
  3. 西安交通大学动力工程多相流国家重点实验室,陕西,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.19805/j.cnki.jcspe.2025.240319
  CLC：
- Online First：12 August 2025，
  
  Published：2025
- 稿件说明：
移动端阅览
刘一,陈晨,冉燊铭,王朝阳,刘明,严俊杰. 水煤扰动对亚临界机组动态特性及系统蓄热时空分布特性的影响动力工程学报, 2025, 45(8): 1278-1289 https://doi.

org/10.19805/j.cnki.jcspe.2025.240319
刘一,陈晨,冉燊铭,王朝阳,刘明,严俊杰. 水煤扰动对亚临界机组动态特性及系统蓄热时空分布特性的影响动力工程学报, 2025, 45(8): 1278-1289 https://doi. DOI： 10.19805/j.cnki.jcspe.2025.240319.

org/10.19805/j.cnki.jcspe.2025.240319 DOI：

摘要

为获得给水流量、给煤量等参数对亚临界机组变负荷能力的影响规律

以300 MW等级机组为例

建立并验证了热力系统动态模型。在75%负荷工况下

分别研究了给水流量阶跃减少2.5%~10.0%、给煤量阶跃增加2.5%~10.0%后

热力系统中汽包压力和温度、主蒸汽压力和温度、机组发电功率的变化趋势

获得了热力系统内部蓄热的时空分布特性。结果表明:给水流量减少或给煤量增加后

汽包水位下降

蒸发系统产汽量迅速增加

机组的输出功率也增加;亚临界机组中

汽包锅炉蓄热占整个热力系统总蓄热的90%以上;以汽包最低水位100 mm作为安全运行边界

给水流量减少时热力系统总蓄热最大减少9.2 GJ

给煤量增加时热力系统总蓄热最大减少9.4 GJ;各部分蓄热在演变过程中

汽包内蓄热的变化幅度最大

蓄热变化量达总蓄热的1/3左右

具备提升1.85%/min变负荷速率的潜力。

Abstract

To obtain the influence of feed water flow rate

coal supply flow rate and other parameters on the load cycling capacity of the subcritical unit

a dynamic thermal system model was established and verified by taking a 300 MW unit as an example. Under 75% load working conditions

the change trends of drum pressure and temperature

main steam pressure and temperature

and unit power generation in the thermal system were studied after the feed water flow rate was reduced by 2.5%-10.0% and the coal supply flow rate was increased by 2.5%-10.0%

and the temporal and spatial distribution characteristics of heat storage in the thermal system were obtained. Results show that when the feed water flow rate decreases or the coal supply flow rate increases

the drum water level drops

the steam production of the evaporation system increases rapidly

and the output power of the unit increases. In the subcritical unit

the heat storage of the drum boiler accounts for more than 90% of the entire thermal system. Taking the lowest drum water level of 100 mm as the safe operation boundary

the total heat storage of the thermal system decreases by a maximum of 9.2 GJ when the feed water flow rate decreases

and decreases by a maximum of 9.4 GJ when the coal supply flow rate increases. During the evolution of the heat storage of each part

the heat storage in the drum has the largest change amplitude

and the heat storage change accounts for about one-third of the total heat storage

which has the potential to increase the load cycling rate by 1.85%/min.

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