Economic optimization of low-temperature waste heat recovery in supercritical carbon dioxide coal-fired power system

SUN Ruiqiang; YANG Kaixuan; WANG Bo; LIU Ming; YAN Junjie

doi:10.19666/j.rlfd.202005126

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Economic optimization of low-temperature waste heat recovery in supercritical carbon dioxide coal-fired power system

更新时间：2025-09-28

- Economic optimization of low-temperature waste heat recovery in supercritical carbon dioxide coal-fired power system
- Thermal Power Generation Vol. 49, Issue 10, Pages: 120-129(2020)
- 作者机构：
  
  1. 西安交通大学能源与动力工程学院
  2. 东方电气股份有限公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202005126
  CLC： TK115
- Published Online：15 September 2020，
  
  Published：2020
- 稿件说明：
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SUN Ruiqiang, YANG Kaixuan, WANG Bo, et al. Economic optimization of low-temperature waste heat recovery in supercritical carbon dioxide coal-fired power system[J]. Thermal power generation, 2020, 49(10): 120-129.
DOI：

SUN Ruiqiang, YANG Kaixuan, WANG Bo, et al. Economic optimization of low-temperature waste heat recovery in supercritical carbon dioxide coal-fired power system[J]. Thermal power generation, 2020, 49(10): 120-129. DOI： 10.19666/j.rlfd.202005126.

摘要

现有超临界二氧化碳(S-CO_2)燃煤发电系统锅炉排烟温度为120℃左右。通过系统优化降低锅炉排烟温度

有望进一步提高燃煤发电系统效率和烟气除尘效率。为此

本文以1 000 MW S-CO_2燃煤发电系统为例

通过回热系统、烟气冷却系统和空气预热系统的耦合优化

提出了带有低温烟气余热回收系统的改进构型;建立了热力学和技术经济性分析模型

以技术经济性最优对构型进行了优化分析。结果表明:采用烟道旁路、低温省煤器及主压缩机中间冷却的改进构型4

可将排烟温度降低至约95℃

与基础构型相比

可提高锅炉效率1.5%

提高电厂效率1.45%。通过分析燃料成本和运行时间对度电成本的影响

证明改进构型4的度电成本最低

经济性效果最好。

Abstract

The exhaust temperature of boiler in current supercritical carbon dioxide coal-fired power systems is about 120 ℃. The efficiencies of the coal-fired power system and flue gas dust collector can be enhanced by further cooling the boiler exhaust temperature with system optimization. Therefore

by taking a 1 000 MW coal-fired power plant as the example

improved configurations with low-temperature flue gas heat recovery system were proposed by coupling and matching of the air pre-heating process

heat regenerative process and flue gas cooling process. Moreover

the thermodynamic and technical economic models were developed

and the configurations were economically optimized. The results show that

the exhaust temperature can be decreased to about 95 ℃ when the low temperature economizer is integrated together with the main compressor intercooling and flue bypass ahead the air-preheater. Compared with the basic configuration

the improved configuration 4's boiler efficiency increases by 1.5% and the power plant efficiency increases by 1.45%. By analyzing the influences of fuel cost and running time on the electricity cost

it is proved that the improved configuration 4 has the lowest levelized cost of electricity and the best economic effect.

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