PTFE膜接触吸收船舶烟气CO_(2)影响因素的研究

Study of factors affecting contact absorption of CO_(2)by PTFE membrane

为减少航运业二氧化碳的排放,选择海水作为吸收剂,以脱碳率为评价指标,探究了海水温度、海水流量、CO_(2)混合气体流量、CO_(2)浓度、海水pH值对PTFE膜接触器吸收CO_(2)的影响。结果表明:海水温度和pH值影响CO_(2)的溶解度及中和反应,18℃、pH=8时脱碳率最高,分别为64.83%、87.67%;CO_(2)的浓度影响气液两相CO_(2)浓度差,20%时脱碳率最高(67.81%);海水流量影响气液接触面的吸收剂更新速度,200 L/h时脱碳率最佳;CO_(2)混合气体流量影响混合气体在膜接触反应器内的停留时间,0.10 m^(3)/h时脱碳率最佳;根据实验结果优化了PTFE膜接触吸收CO_(2)的条件。

In order to reduce carbon dioxide emissions from shipping,seawater was selected as the absorber,and the decarbonization rate was used as the evaluation index to investigate the effects of seawater temperature,seawater flow rate,CO_(2)gas mixture flow rate,CO_(2)concentration,and seawater pH value on the absorption of CO_(2).The results showed that seawater temperature and pH value affected the solubility and neutralization reaction of CO_(2),with the highest decarbonization rates respectively of 64.83%and 87.67%at the temperature of 18℃and pH=8.The concentration of CO_(2)affects the difference in CO_(2)concentration between the gas and liquid phases,and the highest decarbonization rate(67.81%)at 20%,Seawater flow rate affected the renewal rate of the absorbent at the gas-liquid contact surface,and the best decarbonization rate is 200 L/h.CO_(2)gas mixture flow rate affected the residence time of the mixture in the membrane contact reactor,and the decarbonization rate was the best at 0.10 m^(3)/h optimized conditions for contact absorption of CO_(2)by PTFE membranes.