On the retrofitting and repowering of coal power plants with post-combustion carbon capture: An advanced integration option with a gas turbine windbox
On the retrofitting and repowering of coal power plants with post-combustion carbon capture: An advanced integration option with a gas turbine windbox
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DOI：
10.1016/j.ijggc.2016.09.015
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发表时间：
2017-01-01
影响因子：
3.9
通讯作者：
Lucquiaud, Mathieu
中科院分区：
文献类型：
--
作者：
del Rio, Maria Sanchez;Gibbins, Jon;Lucquiaud, Mathieu
改造现有燃煤电厂的很大一部分可能是全球碳捕获和储存的重要组成部分。对于适合改造的工厂，燃烧后碳捕集的能量损失可以通过捕集系统与动力循环的有效集成来最小化。以前关于有效集成方案的工作通常集中在从动力循环中提取蒸汽并减少现场功率输出，或者通过天然气燃烧向捕获系统提供热和电力，很少考虑相关的碳排放。本文提出了燃气涡轮机、现有的燃煤电厂和燃烧后捕集工艺，捕集两种燃料的碳排放。燃气涡轮机的废气通过风箱进入现有的燃煤锅炉进行连续燃烧，以允许在单个专用捕集装置中进行捕集，所产生的烟气具有较低的流速和较高的CO2浓度。通过将热回收蒸汽发生器与锅炉、现有蒸汽循环和碳捕获工艺有效集成，在本研究中使用的参考亚临界机组可以以295 kWh/tCO（2）的电力输出损失来重新提供动力，比相同机组的常规抽汽改造低5%，并且天然气燃烧的边际热效率为50% LHV 5%点高于燃气涡轮机具有专用捕获单元的配置。(C)2016作者（S）爱思唯尔有限公司出版
Retrofitting a significant fraction of existing coal-fired power plants is likely to be an important part of a global rollout of carbon capture and storage. For plants suited for a retrofit, the energy penalty for post-combustion carbon capture can be minimised by effective integration of the capture system with the power cycle. Previous work on effective integration options has typically been focused on either steam extraction from the power cycle with a reduction of the site power output, or the supply of heat and electricity to the capture system via the combustion of natural gas, with little consideration for the associated carbon emissions.This article proposes an advanced integration concept between the gas turbine, the existing coal plant and post-combustion capture processes with capture of carbon emissions from both fuels. The exhaust gas of the gas turbine enters the existing coal boiler via the windbox for sequential combustion to allow capture in a single dedicated capture plant, with a lower flow rate and a higher CO2 concentration of the resulting flue gas. With effective integration of the heat recovery steam generator with the boiler, the existing steam cycle and the carbon capture process, the reference subcritical unit used in this study can be repowered with an electricity output penalty of 295 kWh/tCO(2) 5% lower than a conventional steam extraction retrofit of the same unit and marginal thermal efficiency of natural gas combustion of 50% LHV 5% point higher than in a configuration where the gas turbine has a dedicated capture unit. (C) 2016 The Author(s). Published by Elsevier Ltd.