摘要
以氨水为吸收剂进行CO_(2)化学吸收时,为抑制氨挥发,一般需要在高温高压条件下对富CO_(2)氨水进行热解吸,能耗较高。基于此,本文提出在氨水富液中添加生物质灰,通过生物质灰的CO_(2)矿化特性来实现氨水富液解吸与CO_(2)固定,并探究了生物质灰矿化解吸氨水富液的可行性、氨水贫液的沼气CO_(2)再吸收特性以及氨水在“CO_(2)吸收-生物灰矿化解吸”中的循环稳定性。结果表明,在氨水富液中添加生物质灰,能有效解吸氨水富液,且解吸后获得的氨水贫液具备良好的CO_(2)再吸收性能,净CO_(2)吸收能力最高可达0.32mol/mol。在常压条件下,氨水富液的CO_(2)负荷降幅随生物质灰添加量及反应温度的增加而增大。在初始CO_(2)负荷为0.6mol/mol的氨水富液中添加生物质灰进行解吸时,当添加量从50g/L提升至250g/L时,富液CO_(2)负荷降幅从18.83%急剧上升至94.17%。与直接添加CaO解吸相比,生物质飞灰矿化解吸氨水富液时,氨水的CO_(2)循环吸收能力略低,但在5个“吸收-解吸”循环周期里,氨水的平均净CO_(2)吸收能力仍能达到0.24mol/mol。
In the ammonia-based CO_(2)chemical absorption process,CO_(2)-rich ammonia aqueous solution is generally regenerated at the high temperature and pressure conditions for inhibiting the ammonia volatilization,in which a high energy input is necessary.To minimize the energy inputs,biomass ash was adopted into the CO_(2)-rich ammonia aqueous solution(i.e.,rich ammonia solution)in this study for CO_(2) desorption and CO_(2) fixation through CO_(2)mineralization.The feasibility of CO_(2) desorption by adding biomass ash,CO_(2) reabsorption performance of CO_(2)-lean ammonia aqueous solution and cyclic stability of ammonia during CO_(2) absorption-CO_(2) desorption induced by biomass ash addition were experimented.The results showed that the rich ammonia solution can be desorbed effectively through adding biomass ash to form the CO_(2)-lean ammonia aqueous solution with a maximum net CO_(2) absorption capacity of 0.32mol/mol.Under the ambient pressure,the decrement of CO_(2) loading of rich ammonia solution increased with the biomass ash dosage and reaction temperature.When the dosage of biomass ash added into the rich ammonia solution with an initial CO_(2) loading of 0.6mol/mol varied from 50g/L to 250g/L,the decrement of CO_(2) loading of rich ammonia solution increased gigantically from 18.83%to 94.17%.Compared to the case adopting CaO,adopting biomass ash to desorb rich ammonia solution could achieve a relatively lower cyclic CO_(2) absorption performance.However,an averaged net CO_(2) absorption capacity of ammonia with 0.24mol/mol could still be achieved in five“absorption-desorption”cycles.
作者
韦诗慧
郑璇
王燕
汪洋
纪龙
晏水平
WEI Shihui;ZHENG Xuan;WANG Yan;WANG Yang;JI Long;YAN Shuiping(College of Engineering,Huazhong Agricultural University,Wuhan 430070,Hubei,China;Key Laboratory of Agricultural Equipment in Mid-lower Yangtze River,Ministry of Agriculture and Rural Affairs,Wuhan 430070,Hubei,China)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2024年第10期5950-5957,共8页
Chemical Industry and Engineering Progress
基金
武汉市知识创新专项——基础研究项目(2023020201010108)
国家自然科学基金(52076101)。
关键词
二氧化碳捕集
吸收
解吸
生物质灰
沼气提纯
CO_(2) capture
absorption
desorption
biomass ash
biogas upgrading
