低温等离子体氧化氨气影响因素及动力学研究

采用电晕放电低温等离子体处理模拟氨气恶臭气体,考察了输入功率、初始浓度、气体湿度、停留时间等因素对降解效果和能量效率的影响,同时对反应过程进行了动力学研究。研究表明,输入功率以及停留时间对氨气降解的影响是积极的,但能量效率随着两者的增加先增大后减小。氨气的降解率随着初始浓度的增加而降低,而能量效率随着输入功率的增加而增加。氨气降解率和能量效率均随着气体湿度的增加而增加,当气体湿度为45%时达到最大值,然而随着气体湿度的进一步增加,其降解率和能量效率反而降低。反应尾气中臭氧浓度随着输入功率的增加而不断升高,而氨气的存在却使臭氧浓度有不同程度的降低。对电晕放电低温等离子体处理NH3的反应动力学进行了分析,得到NH3的反应速率常数为kNH3=0.0707 m3/(W·h)。

Study of influencing factors and kinetics of ammonia degradation with non-thermal plasma technology

Non-thermal plasma reactor (NTP) was employed to degrade the ammonia existing in foul gas.The influencing factors of input power,initial concentrations,relative humidity and resident time on ammonia degradation and energy efficiency were investigated,and the macro-dynamics of reaction mechanism were also analyzed.The results showed that the ammonia degradation increased with increasing input power and residence time,while the energy efficiency increased with increasing input power and residence time and then decreased.Ammonia degradation decreased with increasing initial concentration,while energy efficiency increased with increasing initial concentration.Ammonia degradation and energy efficiency increased with elevated relative humidity to 45%,which is followed by a decrease with a further increase in relative humidity.The ozone concentration in the reaction gas increases with increasing power input,and the presence of ammonia can significantly decrease ozone concentration.The reaction kinetic of NH₃ was also analyzed and discussed,and the reaction rate constant of NH₃ was 0.0707 m³/(W·h).