Research on variable load performance of CFB heating unit based on condensate throttle and thermal network energy storage

ZHANG Kaiping; GAO Mingming; ZHANG Hongfu; WANG Yong; MA Cong; WEI Guang; YUE Guangxi

doi:10.19666/j.rlfd.202107144

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Research on variable load performance of CFB heating unit based on condensate throttle and thermal network energy storage

Thermal Power Generation Vol. 51, Issue 4, Pages: 47-54(2022)

更新时间：2025-09-28

- Research on variable load performance of CFB heating unit based on condensate throttle and thermal network energy storage
- 作者机构：
  
  1. 新能源电力系统国家重点实验室(华北电力大学控制与计算工程学院)
  2. 华电国际电力股份有限公司天津开发区分公司
  3. 清华大学能源与动力工程系
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202107144
  CLC： TM621
- Published：2022
- 稿件说明：
移动端阅览
ZHANG Kaiping, GAO Mingming, ZHANG Hongfu, et al. Research on variable load performance of CFB heating unit based on condensate throttle and thermal network energy storage[J]. Thermal Power Generation, 2022, 51(4): 47-54.
DOI：

ZHANG Kaiping, GAO Mingming, ZHANG Hongfu, et al. Research on variable load performance of CFB heating unit based on condensate throttle and thermal network energy storage[J]. Thermal Power Generation, 2022, 51(4): 47-54. DOI： 10.19666/j.rlfd.202107144.

摘要

为提高循环流化床机组的变负荷速率，基于火电机组锅炉侧和汽轮机侧响应存在差异，提出了基于凝结水节流和热网蓄能利用的快速变负荷方式。首先建立了抽汽系统以及汽轮机的机理模型，并计算了多个工况下负荷的理论值，验证上述模型的准确性；然后对抽汽系统蓄热进行分析，建立了基于凝结水节流的除氧器蓄热和热网蓄热定量计算模型，分析了影响循环流化床供热机组蓄热能力主要因素；最后提出了蓄热和负荷等响应特性。结果表明：循环流化床供热机组因存在冷渣环节，可调节凝结水流量受限，除氧器蓄热较煤粉炉更小；热网蓄热作为一个巨大的蓄热体，充分利用可提供可观的负荷提升，且短时间内的波动对于热网整体并无影响；除氧器蓄热和热网蓄热2种方式结合使用，在带供热工况下，变负荷时间可以缩短达4 min左右。

Abstract

In order to increase the variable load rate of circulating fluidized bed(CFB) units

a fast variable load method is proposed based on condensate throttling and heat network energy storage utilization according to the difference between the response of the boiler side and the steam turbine side of the thermal power unit. Firstly

the mechanism model of the extraction steam system and steam turbine is established

and the theoretical value of load under multiple operating conditions is calculated to verify the accuracy of the above model. Then

the heat storage of the extraction steam system is analyzed

and the quantitative calculation model for heat storage of deaerator and heat network is established based on condensate throttling. The main factors affecting the heat storage capacity of the CFB heating units are analyzed. Finally

the response characteristics of heat storage and load are put forward.The results show that

the CFB heating unit has limited adjustable condensate flow due to the slag cold link

and the heat storage of the deaerator is smaller than that of the pulverized coal furnace. The heat storage of the heating network is a huge heat storage body

its full utilization can provide a considerable load rise

and the short-term fluctuations have no effect on the overall heating network. The combination of the above two methods can shorten the variable load time by up to 4 minutes under heating conditions.

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