发电技术 ›› 2022, Vol. 43 ›› Issue (1): 126-130.DOI: 10.12096/j.2096-4528.pgt.20018

• 发电及环境保护 • 上一篇    下一篇

低温场景超临界CO2循环燃煤发电系统研究

郑开云   

  1. 上海发电设备成套设计研究院有限责任公司,上海市 闵行区 200240
  • 收稿日期:2021-04-07 出版日期:2022-02-28 发布日期:2022-03-18
  • 作者简介:郑开云(1980),男,博士,高级工程师,主要从事先进能源技术研究,zhengkaiyun@speri.com.cn

Study on Supercritical CO2 Cycle Coal-fired Power Generation System for Low Temperature Scenario

Kaiyun ZHENG   

  1. Shanghai Power Equipment Research Institute Co. Ltd. , Minhang District, Shanghai 200240, China
  • Received:2021-04-07 Published:2022-02-28 Online:2022-03-18

摘要:

超临界CO2循环在低温场景下,循环终端温度降低,循环压比增大,可以与燃煤锅炉很好地匹配,组成高效的燃煤发电机组。根据气候和煤炭分布,我国北方煤炭基地(如蒙东、北疆)在冬、春季有长达4个月以上的低温条件,有利于构建高效的超临界CO2燃煤发电机组。对于3~15 ℃的终温工况,对超临界CO2循环发电机组进行热力计算,并对机组的经济和社会效益作初步分析。结果表明:初始参数620 ℃/30 MPa的超临界CO2循环发电机组在9 ℃以下低温场景下,可获得48%以上的全厂净发电效率,高于二次再热超超临界汽轮发电机组。超临界CO2循环燃煤发电可补充可再生能源发电在冬、春季的发电量缺口,并可通过“北电南送”实现北方煤炭资源的高效利用。

关键词: 超临界CO2循环, 燃煤发电, 低温环境

Abstract:

Supercritical CO2 cycle can be used in the low temperature scenario to reduce the end temperature of the cycle and increase the cycle pressure ratio, which can well match with the coal-fired boiler to form a high-efficiency coal-fired power plant. Considering the climate and coal mine distribution, the coal mine bases in northern China, such as eastern Inner Mongolia and northern Xinjiang, have low atmospheric temperature conditions for more than four months in winter and spring, which is good for the constrution of high-efficiency supercritical CO2 coal-fired power plants. For the end temperature condition of 3-15 ℃, the thermodynamic calculation of supercritical CO2 cycle was carried out, and the economic and social benefits of the unit were analyzed. The results show that the supercritical CO2 cycle generator with 620 ℃/30 MPa initial parameters can obtain more than 48% of the net plant power generation efficiency in the low temperature scenario below 9 ℃, which is expected to surpass the efficiency of double-reheat ultra supercritical steam turbine unit. Supercritical CO2 cycle coal-fired power plants can supplement the power generation gap of renewable energy generation in winter and spring, and realize the efficient utilization of coal resources in the north through “North to South Power Transmission”.

Key words: supercritical CO2 cycle, coal-fired power generation, low temperature environment

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