Degradation study of a novel polymorphic sorbent under realistic post-combustion conditions
Degradation study of a novel polymorphic sorbent under realistic post-combustion conditions
复制标题
DOI：
10.1016/j.fuel.2016.08.098
复制
发表时间：
2016-12-15
期刊：
影响因子：
7.4
通讯作者：
Fennell, Paul S.
中科院分区：
文献类型：
--
作者：
Clough, Peter T.;Boot-Handford, Matthew E.;Fennell, Paul S.
钙循环是一种碳捕获和储存（CCS）技术，具有应用于发电厂和一些工业排放源的潜力。使用基于氧化钙的吸附剂的主要问题是它们的承载能力的特征衰减。这是由烧结引起的，并且在CO2吸收（碳酸化）和释放（煅烧）的多个循环期间变得更糟。本文提供了一种新型的吸附剂，能够再生的孔隙率在钙循环的温度循环过程中的降解的调查。该吸附剂的孔隙率再生是硅酸二钙添加剂经历可靠相变（α 'β）的结果，其因此具有与之相关的有用体积变化。结果表明，在流化气中存在CO2的情况下煅烧时，吸附剂表现出特征性的承载能力下降，但在流化气中不存在CO2的情况下煅烧时，吸附剂的承载能力没有下降。本文还提出了一种改进的方法来进行CO2吸收剂的TGA承载能力测量，该方法最大限度地减少了循环之间的过度碳酸化。(C)2016由Elsevier Ltd.出版
Calcium looping is a Carbon Capture and Storage (CCS) technology which has the potential to be applied to both power generation plants and some industrial emission sources. The main problem with the use of calcium oxide-based sorbents is their characteristic decay in carrying capacity. This is caused by sintering and is made worse during multiple cycles of CO2 absorption (carbonation) and release (calcination). This paper provides an investigation into the degradation of a novel type of sorbent that is able to regenerate porosity during the temperature cycling of calcium looping. The porosity regeneration of this sorbent is a result of a dicalcium silicate additive undergoing a reliable phase change (alpha' beta), which consequently has a useful volume change associated with it. The sorbent here, has been tested for the first time under reasonably realistic conditions within a TGA for multiple cycles. The results demonstrated that the sorbent displays the characteristic decline in carrying capacity when calcined in the presence of CO2, but not when calcined in the absence of CO2 in the fluidising gas. This paper also presents an improved method to conduct TGA carrying capacity measurements of CO2 sorbents which minimises the over carbonation between cycles. (C) 2016 Published by Elsevier Ltd.