Ca-based sorbent looping combustion for CO2 capture in pilot-scale dual fluidized beds
Ca-based sorbent looping combustion for CO2 capture in pilot-scale dual fluidized beds
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DOI：
10.1016/j.fuproc.2008.06.011
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发表时间：
2008-12-01
影响因子：
7.5
通讯作者：
Anthony, Edward J.
中科院分区：
文献类型：
--
作者：
Lu, Dennis Y.;Hughes, Robin W.;Anthony, Edward J.
为了证明使用钙基吸附剂循环技术从化石燃料燃烧中原位捕集CO2的工艺可行性，构建了柔性常压双流化床燃烧系统。两种反应器的内径均为100 mm，可在高达1000 ℃的大气压下运行。本文介绍了各种操作条件下的初步结果，包括吸附剂循环率，烟气流量，CaO/CO2比和燃烧模式，为吸附剂再生器供热，包括含氧燃料燃烧的生物质和煤与烟气再循环，以实现高浓度的CO2的废气。作者认为，这项研究是首次使用中试规模的双流化床系统演示该技术，该系统具有连续的吸附剂循环，用于原位CO2捕集，尽管是在大气压下。进行了多次循环试验，在前几次循环中实现了高CO2捕获效率（>90%），即使在超过25次循环后，该效率也降低到仍然可接受的水平（>75%）。循环吸附剂进行了在线采样，并显示出与使用实验室规模的热重分析（TGA）装置观察到的功能一般协议。正如预期的那样，CO2捕集效率随着吸附剂循环次数的增加而降低，并且发现吸附剂磨损是限制吸附剂性能的另一个重要因素。皇冠版权所有（C）2008年出版的爱思唯尔B. V.保留所有权利。
To demonstrate process feasibility of in situ CO2 capture from combustion of fossil fuels using Ca-based sorbent looping technology, a flexible atmospheric dual fluidized bed combustion system has been constructed. Both reactors have an ID of 100 mm and can be operated at up to 1000 degrees C at atmospheric pressure. This paper presents preliminary results for a variety of operating conditions, including sorbent looping rate, flue gas stream volume, CaO/CO2 ratio and combustion mode for supplying heat to the sorbent regenerator, including oxy-fuel combustion of biomass and coal with flue gas recirculation to achieve high-concentration CO2 in the off-gas. It is the authors' belief that this study is the first demonstration of this technology using a pilot-scale dual fluidized bed system, with continuous sorbent looping for in situ CO2 capture, albeit at atmospheric pressure. A multicycle test was conducted and a high CO2 capture efficiency (>90%) was achieved for the first several cycles, which decreased to a still acceptable level (>75%) even after more than 25 cycles. The cyclic sorbent was sampled on-line and showed general agreement with the features observed using a lab-scale thermogravimetric analysis (TGA) apparatus. CO2 capture efficiency decreased with increasing number of sorbent looping cycles as expected, and sorbent attrition was found to be another significant factor to be limiting sorbent performance. Crown Copyright (C) 2008 Published by Elsevier B.V. All rights reserved.