School of Energy and Power Engineering, Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology 116023, Dalian, China.
J Hazard Mater. 2010 Nov 15;183(1-3):759-65. doi: 10.1016/j.jhazmat.2010.07.091. Epub 2010 Jul 30.
The gas-solid reaction and breakthrough curve of CO(2) capture using calcium oxide sorbent at high temperature in a fixed-bed reactor are of great importance, and being influenced by a number of factors makes the characterization and prediction of these a difficult problem. In this study, the operating parameters on reaction between solid sorbent and CO(2) gas at high temperature were investigated. The results of the breakthrough curves showed that calcium oxide sorbent in the fixed-bed reactor was capable of reducing the CO(2) level to near zero level with the steam of 10 vol%, and the sorbent in CaO mixed with MgO of 40 wt% had extremely low capacity for CO(2) capture at 550°C. Calcium oxide sorbent after reaction can be easily regenerated at 900°C by pure N(2) flow. The experimental data were analyzed by shrinking core model, and the results showed reaction rates of both fresh and regeneration sorbents with CO(2) were controlled by a combination of the surface chemical reaction and diffusion of product layer.
高温固定床反应器中氧化钙吸附剂捕集 CO2 的气固反应和突破曲线非常重要，但受到许多因素的影响，使得对这些因素的特征描述和预测成为一个难题。本研究考察了高温下固体吸附剂与 CO2 气体之间反应的操作参数。突破曲线的结果表明，在 10%体积分数的蒸汽存在下，固定床反应器中的氧化钙吸附剂能够将 CO2 水平降低到接近零水平，并且在 550°C 时，氧化钙与 40wt%氧化镁混合的吸附剂对 CO2 的捕集能力极低。反应后的氧化钙吸附剂可以通过纯 N2 流在 900°C 下轻松再生。通过收缩核模型对实验数据进行分析，结果表明，新鲜和再生吸附剂与 CO2 的反应速率均受表面化学反应和产物层扩散的组合控制。
