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在常压、60~90℃下通过试验系统对氨水吸收CO2后的富液的再生特性以及再生液的吸收能力进行了研究,得到了影响氨水富液再生的因素及再生液的吸收性能.结果表明:提高再生温度可以增大CO2的再生速率和再生程度;氨水富液负荷对再生有很大影响,负荷低于0.4 molCO2/mol NH3时,再生率维持在较低水平,随后再生率随负荷上升而线性增加;负荷为0.6 molCO2/mol NH3时,氨水富液已基本丧失脱碳能力,再生后其吸收性能得到一定恢复;在再生液中添加少量的新鲜氨水,有助于恢复再生液对CO2的吸收能力;综合考虑富液再生与再生液吸收两方面,推荐氨水循环脱碳时负荷变化范围为富液0.6 mol CO2/mol NH3,贫液0.4 mol CO2/mol NH3.
The regeneration characteristics of rich liquid after absorption of CO2 by ammonia water and the absorption capacity of regenerant liquid were studied by the test system at atmospheric pressure and 60 ~ 90 ℃, and the factors influencing regeneration of ammonia rich liquid and the absorption capacity of regenerant liquid were obtained. The results show that increasing regeneration temperature can increase the regeneration rate and regeneration degree of CO2. Ammonia rich liquid load has a great influence on regeneration. When the load is lower than 0.4 molCO2 / mol NH3, the regeneration rate is kept at a low level, And the concentration of ammonia in the recycle liquid has a linear increase. When the load is 0.6 molCO2 / mol NH3, the rich liquid of ammonia has basically lost its decarburization capacity, and its absorption performance will be restored after the regeneration. The addition of a small amount of fresh ammonia in the regeneration liquid will help to restore the regeneration liquid When considering the two aspects of rich liquid regeneration and reclaimed liquid absorption, the recommended range of load for ammonia decarbonization is 0.6 mol CO2 / mol NH3 and 0.4 mol CO2 / mol NH3.