Modeling and dynamic characteristic analysis for boiler in a 5 MW supercritical carbon dioxide cycle power unit

QIAO Yongqiang; WANG Shengpeng; BAI Wengang; ZHANG Yifan; ZHANG Xuwei; LI Hongzhi; YANG Yu; GU Zhengmeng; YAO Mingyu

doi:10.19666/j.rlfd.202406146

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Modeling and dynamic characteristic analysis for boiler in a 5 MW supercritical carbon dioxide cycle power unit

更新时间：2025-09-28

- Modeling and dynamic characteristic analysis for boiler in a 5 MW supercritical carbon dioxide cycle power unit
- Thermal Power Generation Vol. 53, Issue 12, Pages: 39-48(2024)
- 作者机构：
  
  1. 西安热工研究院有限公司
  2. 中国华能集团有限公司华中分公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202406146
  CLC： TM621.2
- Published：2024
- 稿件说明：
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QIAO Yongqiang, WANG Shengpeng, BAI Wengang, et al. Modeling and dynamic characteristic analysis for boiler in a 5 MW supercritical carbon dioxide cycle power unit[J]. Thermal power generation, 2024, 53(12): 39-48.
DOI：

QIAO Yongqiang, WANG Shengpeng, BAI Wengang, et al. Modeling and dynamic characteristic analysis for boiler in a 5 MW supercritical carbon dioxide cycle power unit[J]. Thermal power generation, 2024, 53(12): 39-48. DOI： 10.19666/j.rlfd.202406146.

摘要

提升超临界二氧化碳（S-CO_2）锅炉调峰能力是实现S-CO_2燃煤发电机组灵活运行的关键。研究S-CO_2锅炉动态特性有助于优化锅炉运行控制。以西安热工研究院有限公司5MW S-CO_2循环发电机组锅炉为研究对象，基于热力学和传热学原理，建立了S-CO_2锅炉动态仿真模型，并利用机组运行数据验证了模型的可靠性。基于仿真模型，开展了燃料量、工质流量、工质温度等不同边界条件阶跃扰动下S-CO_2锅炉的动态特性分析。结果表明：S-CO_2锅炉具有较大的热惯性，不同边界条件扰动下锅炉出口工质温度稳定时间不同，且随着边界条件扰动幅度增加，稳定时间变长；随着S-CO_2锅炉热负荷升高，锅炉出口工质压力下降，出口工质流量会出现瞬时增大现象。

Abstract

Enhancing peak shaving capability of supercritical carbon dioxide(S-CO_2) boiler is the key to realize flexible operation of S-CO_2 coal-fired power plants. Research on dynamic characteristics of S-CO_2 boiler is beneficial to optimize the boiler operation control strategies. A dynamic simulation model of S-CO_2 boiler is established by the principles of thermodynamics and heat transfer based on the boiler of a 5 MW S-CO_2 cycle power unit designed and built by Xi'an Thermal Power Research Institute

and the reliability of the model is validated with operational data from unit. Based on the simulation model

dynamic characteristics of the above S-CO_2 boiler under step disturbance of different boundary conditions

such as fuel flow rate

working fluid flow rate

and working fluid temperature

are analyzed. The results show that

the S-CO_2 boiler has large thermal inertia

stability times of working fluid temperature at the boiler outlet are different under disturbance of different boundary conditions.With the increase of disturbance range of boundary conditions

stability times become longer. With the increase of boiler heat load

the working fluid pressure at the S-CO_2 boiler outlet decreases

and the working fluid flow rate at the S-CO_2 boiler outlet increases instantaneously in the initial stages of a dynamic process.

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