耦合原料气预热的Sabatier固定床反应器拉偏试验研究

摘要

The CO2 reduction is one of the key technologies of the life-support system in long duration manned space flight.The reactor is the hard core of the CO2 reduction system.Sabatier reaction was tested under the H2/CO2 ratio from 1 ∶ 1 to 5 ∶ 1 and the flow rate of feed gas between 2.0～ 8.0 L/min in a Sabatier fixed-bed reactor coupled with feed gas preheating filled with Ru/Al2 O3 catalysts.The reaction was started successfully at 150 ℃,and the distribution of temperature steps in the reactor was regular under different conditions.The conversion of the lean component reached above 98％ except for the ratio of H2 to CO2 (4∶1).The configuration of the Sabatier fixed-bed reactor coupled with feed gas preheating was reasonable,and the activity of Ru/Al2O3 catalysts was high.The favorable performance was achieved for a crew size of 2～4 persons in the cabin.%CO2还原是长期载人航天中生命保障系统的关键技术,针对作为CO2还原系统核心的反应器及其中的催化剂的效率问题,在耦合原料气预热的Sabatier固定床反应器和Ru/Al2O3催化剂上,在宽范围的原料气氢碳比(1∶1～5∶1)和流量(2～8 L/min)工况下,进行了Sabatier 反应拉偏试验,结果表明:反应的起动温度为150℃,在不同原料气流量和氢碳比下,反应器温度梯度分布合理,贫组分的转化率达到98％以上(氢碳比4:1除外).耦合原料气预热的Saba-tier固定床反应器结构合理,Ru/Al2O3催化剂活性高,能够高效处理舱室中2～4人的代谢量.