机械成型水泥支撑钙基吸收剂脱碳活性及强度

doi:10.16085/j.issn.1000-6613.2017.06.036

化工进展 ›› 2017, Vol. 36 ›› Issue (06): 2222-2229.DOI: 10.16085/j.issn.1000-6613.2017.06.036

机械成型水泥支撑钙基吸收剂脱碳活性及强度

余志健, 段伦博, 李小乐, 苏成林, 赵长遂

东南大学能源与环境学院, 能源热转换及其过程测控教育部重点实验室, 江苏南京 210096

收稿日期:2016-10-09 修回日期:2016-12-26 出版日期:2017-06-05 发布日期:2017-06-05
通讯作者: 段伦博
作者简介:余志健(1993—),男,硕士研究生。E-mail:zhjyu@outlook.com。
基金资助:
国家自然科学基金项目（51661125011）。

CO₂ capacity and strength of cement-supported Ca-sorbent pelletized by granulator

YU Zhijian, DUAN Lunbo, LI Xiaole, SU Chenglin, ZHAO Changsui

Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, Jiangsu, China

Received:2016-10-09 Revised:2016-12-26 Online:2017-06-05 Published:2017-06-05

摘要/Abstract

摘要： 采用湿法机械制粒机制备水泥支撑钙基吸收剂颗粒，在鼓泡床上研究其循环碳酸化活性及磨损，在颗粒碰撞装置上研究其碰撞强度，并结合扫描电镜、氮吸附分析微观结构。研究表明，制粒过程掺杂10%高铝水泥制备的吸收剂高温下具有较好的抗烧结特性，多次循环后孔隙衰竭较弱。其850℃、N₂及950℃、100%CO₂煅烧下的循环钙转化率均优于原始石灰石。成型颗粒鼓泡床内抗磨损能力也优于石灰石。碰撞实验表明，该粉末成型的颗粒煅烧后仍有与石灰石相近的抗碰撞破碎强度。煅烧温度越高，颗粒强度减弱；多次循环后颗粒因烧结强度增加。基于Rittinger磨损理论，结合碰撞数据发展了计算吸收剂碰撞破碎后平均粒径的半经验预测公式。该机械成型、水泥支撑的吸收剂兼具较好的脱碳活性及机械强度。

关键词: 钙基吸收剂, 机械制粒, 水泥支撑, 钙循环, 强度特性, CO₂捕集

Abstract: Cement support and granulation were used to synthesize calcium sorbent. CO₂ capacity was investigated in a quartz bubbling fluidized bed. A particle impact apparatus was employed to evaluate the mechanical strength. The morphology and porosity of the sorbents were also assessed by scanning electron microscope and N₂ absorption/desorption. The synthesized sorbents doped with 10% aluminum cement during pelletisation showed higher sintering resistance and lower porosity decaying than raw limestone. Thus,the cyclic reactivity of the synthesized pellets calcined at 850℃/N₂ or 950℃/100%CO₂ was superior to limestone. The less fine particles in reactor after multiple cycles exhibited higher attrition resistance to synthetic sorbents. The impact tests also showed that the pellets formed from powder still possessed similar impact breakage resistance to limestone after calcination. High calcined temperature decreased the strength of pellets,which could be improved by sintering after multiple cycles. A semi-empirical formula for calculating the average diameter after impact breakage based on Rittinger's surface theory was developed. This sorbent could acquire good reactivity without expense of strength decaying.

Key words: calcium sorbent, granulation, cement support, calcium looping, mechanic strength, CO₂ capture

中图分类号:

TQ534

余志健, 段伦博, 李小乐, 苏成林, 赵长遂. 机械成型水泥支撑钙基吸收剂脱碳活性及强度[J]. 化工进展, 2017, 36(06): 2222-2229.

YU Zhijian, DUAN Lunbo, LI Xiaole, SU Chenglin, ZHAO Changsui. CO₂ capacity and strength of cement-supported Ca-sorbent pelletized by granulator[J]. Chemical Industry and Engineering Progress, 2017, 36(06): 2222-2229.

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机械成型水泥支撑钙基吸收剂脱碳活性及强度

CO₂ capacity and strength of cement-supported Ca-sorbent pelletized by granulator

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机械成型水泥支撑钙基吸收剂脱碳活性及强度

CO2 capacity and strength of cement-supported Ca-sorbent pelletized by granulator

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CO₂ capacity and strength of cement-supported Ca-sorbent pelletized by granulator