Reactivity of highly cycled particles of CaO in a carbonation/calcination loop

被引:159
作者
Grasa, Gemma S. [1 ]
Abanades, J. Carlos [2 ]
Alonso, Monica [2 ]
Gonzalez, Belen [2 ]
机构
[1] CSIC, Inst Carboquim, Zaragoza 50015, Spain
[2] CSIC, Inst Nacl Carbon, Oviedo 33011, Spain
关键词
limestone; CO2; capture; regenerable sorbent; carbonation; kinetics;
D O I
10.1016/j.cej.2007.05.017
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Calcium oxide can be an effective sorbent for separating CO2 at high temperatures. The carbonation reaction is the basis for several proposed high temperature CO2 capture systems when coupled with a calcination step to produce a pure CO2 stream. Fresh calcined lime is known to be able to carbonate very readily at appropriate temperatures, but the average sorbent particle in a capture system using CaO as regenerable sorbent has to undergo many carbonation/calcination cycles. This work investigates the carbonation reaction rates in highly cycled sorbent particles of CaO (20-100 s of carbonation/calcination cycles). A basic reaction model (homogeneous model) has been proved to be sufficient for interpreting the reactivity data obtained under different conditions: partial pressure of CO2, particle sizes and other relevant operation variables for the carbonation/calcination loop. The intrinsic rate parameter was found to be between 3.2 and 8.9 x 10(-10) m(4)/mol s in agreement with other values found in the literature. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:561 / 567
页数:7
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