KO2／NaO2－H2O－CO2反应系统特性的研究

A Study on the Characteristics of KO2/NaO2-H2O-C02 Reaction System

采用固定床微分管式反应器进行了一系列不同湿度下的等温实验，对ｋＯ２－Ｈ２Ｏ－ＣＯ２反应系统的行为进行了观察，着重观察了温度和湿度对反应系统的影响。共进行了２３次实验，其中在中等湿度（５５％ＨＲ）下进行了１３次实验，高湿度（７５％ＨＲ）下进行了７次实验，低湿度（３３％ＨＲ）下进行了３次实验。此外，还对所用的ＫＯ２／ＮａＯ２；样品进行了热分析（ＴＧＡ和ＤＳＣ）试验。初步实验结果揭示了一些在积分反应器中无法观察到的现象，这些结果对反应器的合理设计具有一定的指导意义。实验表明，反应床的温度对ＫＯ２－Ｈ２Ｏ－ＣＯ２反应系统的行为具有重要的影响。升高温度，该反应系统的产Ｏ２速率、ＣＯ２吸收速率以及Ｈ２Ｏ吸收速率均显著降低，并且随着温度的变化，反应固体（固体反应物和固体产物）发生不同的结构变化。在室温（２０℃）下，固体产物发生显著的膨胀，造成反应床严重结块；在温度升高时，ＫＯ２则可能发生烧结，使其颗粒间发生相互融合，致使其孔隙率降低和孔隙孔口闭合，进而导致ＫＯ２不能反应完全。湿度对反应系统的行为也有很大影响。增加进气的湿度，使该系统的产Ｏ２速率、ＣＯ２吸收速率以及ＨＯ２吸收率均提高。但是湿度增加，反应床吸Ｈ２Ｏ量增加，致?

To investigate the reaction characteristics of ko2/NaO2-H2O-CO2 reac-tion system,a packed-bed differential tubular reactor was used and a series of isothermal ex-periments were conducted。The main aim is to study the effects of temperature and humidity on the reaction system performance ,as well as the thermal decomposition properties of KO2 and NaO2.The results showed that an increase in the bed temperature led to a significant de-crease in the O2 production rate,and CO2 and H2O absorption rates,while an increase in the inlet humidity led to an increase in the O2 production rate,and CO2 and H2O absorption rates ,but the possibility of plug- formation also increased。 It also showed that higher tem-perature may lead to the sintering of KO2/NaO2 particles and further to their incomplete uti-lization.The thermal decomposition of both KO2 and NaO2 were endothermal ,and the ther-mal decomposition temperature range was 126～212℃for KO2 sample and 145～292 C for NaO2 sample。