Aimed at the secondary pollution control of ammonia-containing wastewater and exhaust gas from the chilled ammonia based CO2capture process,a method was proposed to use waste water partly replacing process water for two stage ammonia washing and to remove the absorbed ammonia by two stage rectification.Referring to the low temperature and low concentration conditions involved in the process,the VLE data of NH3-CO2-H2O system was calculated.On the basis of the VLE curves,mass transfer analysis was made to the simultaneous absorption of NH3and CO2.The results show that the ammonia pollution control standards of 10 mg/m3for exhaust gas and 15 mg/L for wastewater both can be satisfied without increasing energy consumption for distillation.
