燃煤烟气化学吸收碳捕集系统分析与优化

doi:10.16085/j.issn.1000-6613.2017-1417

化工进展 ›› 2018, Vol. 37 ›› Issue (06): 2406-2412.DOI: 10.16085/j.issn.1000-6613.2017-1417

燃煤烟气化学吸收碳捕集系统分析与优化

何卉, 方梦祥, 王涛, 葛坤

浙江大学能源清洁利用国家重点实验室, 浙江杭州 310027

收稿日期:2017-07-10 修回日期:2017-08-16 出版日期:2018-06-05 发布日期:2018-06-05
通讯作者: 方梦祥,教授,主要研究方向为二氧化碳控制技术、煤及生物质燃烧和气化技术。
作者简介:何卉(1993-),女,硕士研究生。
基金资助:
国家重点研发计划项目（2017YFB0603300）。

Analysis and optimization of post-combustion CO₂ capture system based on chemical absorption

HE Hui, FANG Mengxiang, WANG Tao, GE Kun

State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, Zhejiang, China

Received:2017-07-10 Revised:2017-08-16 Online:2018-06-05 Published:2018-06-05

摘要/Abstract

摘要： 系统工艺优化是有效降低化学吸收法碳捕集成本的手段之一。本文以1000MW燃煤机组燃烧后烟气化学吸收CO₂捕集系统为研究对象，建立该系统碳捕集能耗模型和成本模型；在此基础上研究各流程参数对碳捕集能耗及成本的影响规律并获得基于正交设计的最优参数组合。结果显示： CO₂脱除率、吸收剂质量浓度、贫富液换热器端差能显著影响系统碳捕集能耗及成本。随着CO₂脱除率的增加（50%～90%）、吸收剂浓度的增大，脱碳系统的CO₂避免成本下降，而对于贫富液换热器端差，存在一个最优值7℃，使得CO₂避免成本最小。本次研究得到的优化方案的再生热耗为3.61GJ/tCO₂，相比基础方案下降10.9%；单位投资为3156.7元/kW，相比基础方案下降12.2%；单位运行成本为177.3元/tCO₂，相比基础方案下降8.0%； CO₂避免成本为315.86元/tCO₂，与基础方案的364.52元/tCO₂相比，下降13.3%。

关键词: 碳捕集, 化学吸收, 能耗, 成本, 模型, 优化

Abstract: Optimization and integration of system is known as a potential approach to efficiently lower the cost of CO₂ chemical absorption capture technology. Energy penalty model and cost model were established for a post-combustion CO₂ chemical absorption system of a 1000MW coal-fired plant. The influence of process parameters was investigated and an optimized scheme was obtained. Results show that CO₂ removal efficiency, absorbent concentration and terminal temperature difference of the rich-lean heat exchanger can affect the energy penalty and cost obviously. CO₂ avoided cost would decrease with the increase of CO₂ removal efficiency(50% to 90%) or the absorbent concentration. There is an optimal terminal temperature difference of the rich-lean heat exchanger as 7℃ to reach the lowest CO₂ avoided cost. The regeneration energy penalty of the optimized scheme is 3.61GJ/tCO₂, 10.9% lower than that of the base case. The unit capital expenditure and operation cost is 3156.7CNY/kW and 177.3CNY/tCO₂, respectively, having reduction of 12.2% and 8.0% over the base case. CO₂ avoided cost of the optimized scheme is 315.86CNY/tCO₂, which is 13.3% lower than 364.52CNY/tCO₂ of the base case.

Key words: CO₂ capture, chemical absorption, energy penalty, cost, model, optimization

中图分类号:

TQ028

何卉, 方梦祥, 王涛, 葛坤. 燃煤烟气化学吸收碳捕集系统分析与优化[J]. 化工进展, 2018, 37(06): 2406-2412.

HE Hui, FANG Mengxiang, WANG Tao, GE Kun. Analysis and optimization of post-combustion CO₂ capture system based on chemical absorption[J]. Chemical Industry and Engineering Progress, 2018, 37(06): 2406-2412.

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燃煤烟气化学吸收碳捕集系统分析与优化

Analysis and optimization of post-combustion CO₂ capture system based on chemical absorption

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燃煤烟气化学吸收碳捕集系统分析与优化

Analysis and optimization of post-combustion CO2 capture system based on chemical absorption

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Analysis and optimization of post-combustion CO₂ capture system based on chemical absorption