Simulation study on the process of carbon dioxide capture and methanation utilization of flue gas in coal-fired power plants

ZHANG Zhihe; WEN Yanbo; ZHANG Jingpeng; GUO Dongfang; YAN Binhang

doi:10.19666/j.rlfd.202007190

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Simulation study on the process of carbon dioxide capture and methanation utilization of flue gas in coal-fired power plants

Thermal Power Generation Vol. 50, Issue 1, Pages: 87-93(2021)

更新时间：2025-09-28

- Simulation study on the process of carbon dioxide capture and methanation utilization of flue gas in coal-fired power plants
- 作者机构：
  
  1. 清华大学化学工程系
  2. 华亭煤业集团有限责任公司煤制甲醇公司
  3. 二氧化碳捕集与处理北京市重点实验室中国华能集团清洁能源技术研究院有限公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202007190
  CLC： TQ-9
- Published Online：30 December 2020，
  
  Published：2021
- 稿件说明：
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ZHANG Zhihe, WEN Yanbo, ZHANG Jingpeng, et al. Simulation study on the process of carbon dioxide capture and methanation utilization of flue gas in coal-fired power plants[J]. Thermal Power Generation, 2021, 50(1): 87-93.
DOI：

ZHANG Zhihe, WEN Yanbo, ZHANG Jingpeng, et al. Simulation study on the process of carbon dioxide capture and methanation utilization of flue gas in coal-fired power plants[J]. Thermal Power Generation, 2021, 50(1): 87-93. DOI： 10.19666/j.rlfd.202007190.

摘要

燃煤电厂烟气中大量的CO_2直接排空对环境负面影响严重

而捕集这部分CO_2并利用可再生能源制氢将其转化为CH4等能源产品

可以同时实现环境保护和能源转换与储存。本文对CO_2捕集-甲烷化利用工艺流程进行了详细的模拟分析

并核算了这一耦合工艺的能耗、碳排放以及经济性。模拟结果表明:捕集工段中CO_2捕集率可达79%

获得摩尔分数98%的CO_2;甲烷化工段中最终得到CH_4摩尔分数为91%～94%的产品气。此过程若采用可再生能源制氢工艺提供H_2

则可显著降低总能耗

实现CO_2净减排。在未来可再生能源制氢成本大幅下降或能够获得大量廉价氢气的情况下

此耦合工艺可获得一定的经济收益

有望成为未来燃煤电厂烟气CO_2大规模工业利用的重要技术路径之一。

Abstract

The direct discharge of large amounts of CO_2 from coal-fired power plants has a serious negative impact on the environment. The conversion of captured CO_2 and H2 generated from renewable energy sources into CH_4 is encouraged for both environmental protection and energy conversion and storage. In this work

the process of CO_2 capture combined with CO_2 methanation was simulated and analyzed. Meanwhile

the energy consumption

net CO_2 emission and cost of CH4 were evaluated. The results show that

the CO_2 capture efficiency can reach 79%

a high purity CO_2(98%

mole fraction) stream is obtained and then transformed to CH4. Finally

a product gas with 91%～94% CH_4 can be produced. When hydrogen is produced from renewable energy sources

the total energy consumption of this process can be significantly reduced and a net carbon emission reduction can be achieved. This combined process can be driven to economically attractive when the cost of hydrogen production from renewable energy sources is greatly decreased in the future or a large amount of cheap hydrogen is available

which is expected to become one of the important technologies for large-scale utilization of captured CO_2 from coal-fired power plants.

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