CAJ | 학술논문

为强化二氧化碳的吸收过程，采用一类旋流逆向气液多级接触的方式，以NaOH溶液为吸收剂，研究其与大跨度浓度CO2（2.5%～15%）接触反应的传质性能。分别探讨了吸收剂浓度、吸收剂流量、烟气CO2浓度、烟气流量及反应温度对气相总体积传质系数（Kga）的定量影响。结果表明，在实验条件下，其Kga可达（4.53×10?5）～（9.22×10?5）kmol·m?3·s?1·kPa?1。与双级直流喷雾和单级旋流喷雾相比，旋流逆向气液多级接触能够有效强化大跨度浓度CO2的吸收过程。Kga随吸收剂浓度、流量和反应温度的增加而增加，随CO2浓度增加呈现先增加后减小（CO2浓度大于5%）的非线性关系，随气体流量增加先增加后趋于稳定。
위강화이양화탄적흡수과정，채용일류선류역향기액다급접촉적방식，이NaOH용액위흡수제，연구기여대과도농도CO2（2.5%～15%）접촉반응적전질성능。분별탐토료흡수제농도、흡수제류량、연기CO2농도、연기류량급반응온도대기상총체적전질계수（Kga）적정량영향。결과표명，재실험조건하，기Kga가체（4.53×10?5）～（9.22×10?5）kmol·m?3·s?1·kPa?1。여쌍급직류분무화단급선류분무상비，선류역향기액다급접촉능구유효강화대과도농도CO2적흡수과정。Kga수흡수제농도、류량화반응온도적증가이증가，수CO2농도증가정현선증가후감소（CO2농도대우5%）적비선성관계，수기체류량증가선증가후추우은정。
To intensify the CO2 absorption process, a reactor based on swirling and multi-staged liquid-gas contact was used to examine the mass transfer performance of long-concentration span CO2 (2.5%—15%) capture with NaOH solution. The effects of absorbent concentration, absorbent flow rate, CO2 concentration, gas flow rate and reaction temperature on volumetric overall mass transfer coefficient (Kga) were experimentally investigated. The mass transfer coefficient varied from 4.53×10?5 to 9.22×10?5 kmol·m?3·s?1·kPa?1 under the experimental conditions. Compared with axial spray with double stages and swirling spray with single stage, swirling-based multi-staged spray reactor was able to effectively enhance the performance of absorption of long-concentration span CO2. A high concentration and a high flow rate of the absorbent, and a high reaction temperature helped to increase Kga. Kga increased with the increase of CO2 concentration, but decreased while CO2 concentration was more than 5%. Kga increased and then stabilized with increase of gas flow rate.