Demonstration of steady state CO2 capture in a 1.7 MWth calcium looping pilot
Demonstration of steady state CO2 capture in a 1.7 MWth calcium looping pilot
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DOI：
10.1016/j.ijggc.2013.07.014
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发表时间：
2013-10-01
影响因子：
3.9
通讯作者：
Sanchez-Biezma, A.
中科院分区：
文献类型：
--
作者：
Arias, B.;Diego, M. E.;Sanchez-Biezma, A.
钙循环（CaL）作为一种燃烧后CO2捕集技术正在迅速发展，因为它与现有的使用循环流化床燃烧器（CFBC）的发电厂相似。在这项工作中，我们提出了一个试点的实验结果，以证明在MWth规模的概念。中试装置处理现有CFBC发电装置（“Ia Pereda”）的1/150的烟道气，并且其已经在稳定状态下操作了数百小时的累积实验时间。中试包括两个15米高的互连循环流化床反应器：CO2吸收器（或CaO碳酸化器）和作为氧燃料CFBC操作的连续CaCO 3煅烧炉。反应器中的操作条件类似于在大型CaL CO2捕集系统中在反应器温度、气体速度、固体成分和循环速率以及反应气氛方面预期的操作条件。CO2捕集效率和固体性质（CO2携带能力和CaO转化为CaCO 3和CaSO 4）的演变已被研究作为关键操作条件的函数。研究表明，当活性CaO的供应量略高于进入碳酸化器的CO2摩尔流量时，CO2捕获效率超过90%是可行的。在稳定状态期间，碳和硫平衡的关闭令人满意。一个基本的反应堆模型，从较小的测试设施似乎提供了一个合理的解释所观察到的趋势。这将有助于进一步推广这项新技术。(c)2013爱思唯尔有限公司保留所有权利。
Calcium looping, CaL, is rapidly developing as a postcombustion CO2 capture technology because its similarity to existing power plants using circulating fluidized bed combustors, CFBC. In this work we present experimental results from a pilot built to demonstrate the concept at the MWth scale. The pilot plant treats 1/150 of the flue gases of an existing CFBC power plant ("Ia Pereda") and it has been operated in steady state for hundreds of hours of accumulated experimental time. The pilot includes two 15 m height interconnected circulating fluidized bed reactors: a CO2 absorber (or carbonator of CaO) and a continuous CaCO3 calciner operated as an oxy-fuel CFBC. Operating conditions in the reactors are resembling those expected in large CaL CO2 capture systems in terms of reactor temperatures, gas velocities, solid compositions and circulation rates and reaction atmospheres. The evolution of CO2 capture efficiencies and solid properties (CO2 carrying capacity and CaO conversion to CaCO3 and CaSO4) have been studied as a function of key operating conditions. It is demonstrated that CO2 capture efficiencies over 90% are feasible with a supply of active CaO slightly over the molar flow of CO2 entering the carbonator. Closure of carbon and sulphur balances has been satisfactory during steady state periods. A basic reactor model developed from smaller test facilities seems to provide a reasonable interpretation of the observed trends. This should facilitate the further scale up of this new technology. (c) 2013 Elsevier Ltd. All rights reserved.