学术
摘 要:
提出了采用醋酸溶液调质石灰石和白云石的方法来提高它们在循环煅烧-碳酸化过反应过程中吸收CO2的能力．在不同反应条件下分别研究了石灰石和白云石的醋酸化产物醋酸钙和醋酸钙镁在循环煅烧-碳酸化过程中的碳酸化转化率．结果表明：碳酸化温度在600～700℃时，醋酸钙和醋酸钙镁的转化率分别明显高于石灰石和白云石，经过15次循环和20次循环后其碳酸化转化率分别可达0．54和0．6．当煅烧温度从920℃增加到1050℃时，醋酸钙和醋酸钙镁转化率和抗烧结性能明显优于石灰石和白云石．随着碳酸化气氛中CO2浓度的增加，醋酸钙和醋酸钙镁转化率的增量小于石灰石和白云石．存在最佳的粒径范围使醋酸钙和醋酸钙镁的碳酸化能力最大．虽然醋酸钙镁的碳酸化转化率高于醋酸钙，但单位质量煅烧后的醋酸钙的CO2吸收量大于醋酸钙镁．[著者文摘]
文章出处:
《东南大学学报：自然科学版》-2008年38卷1期 -123-128页
分 类 号:
文献标识码:
A
文章编号:
1001-0505（2008）01-0123-06
Cyclic carbonation characteristics of calcium-sorbents modified by acetic acid solution
Li Yingjie Zhao Changsui Duan Lunbo Li Qingzhao Liang Cai （ Key Laboratory of Coal Power Generation and Combustion Technology of Ministry of Education, Southeast University, Nanjing 210096, China）
Abstract:
To improve the CO2 capture capability of limestone and dolomite during cyclic calcination-carbonation reaction process it is proposed to modify the limestone and dolomite by acetic acid solution. The carbonation conversions of calcium acetate （CA） and calcium magnesium acetate （CMA） from the acetification of limestone and dolomite reacting by acetic acid solution were investigated under different conditions during multiple calcination-carbonation cycles. The results show that the carbonation conversions of CA and CMA are much higher than those of limestone and dolomite for the carbonation at the range of 600 - 700 ℃, respectively. The conversion of CA reaches as high as 0. 54 after 15 cycles and that of CMA achieves as high as 0. 6 after 20 cycles. Obviously, the anti-sintering capacities of CA and CMA are much greater than those of limestone and dolomite when the calcination temperature increases from 920 ℃ to 1 050 ℃. The increments in the carbonation conversions of CA and CMA are smaller than those of limestone and dolomite with the increase of CO2 concentration in carbonation atmosphere. There might be an optimum particle size range for CA and CMA to achieve the maximum carbonation capability. Although the carbonation conversion of CMA is superior to that of CA, the CO2 capture capacity of calcined CA per unit mass is higher than that of calcined CMA.[著者文摘]
Key words:
acetic acid modification; calcium-sorbents; cyclic carbonation; CO2 capture
基金资助:
国家重点基础研究发展计划（973计划）资助项目（2006CB705806）、江苏省高校研究生科技创新计划资助项目（JS06059）、东南大学优秀博士学位论文基金资助项目.
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