Experiment and analysis of ammonia escape from decarburization absorbent inhibited by NHD

CO2 is the most important greenhouse gas,and reducing its emission has caught wide attention.It is very important to develop CO2 capture technology for coal-fired power plants,which account for major greenhouse gas emission in China.Using ammonia solution to absorb CO2 from flue gas is expected to realize low cost and high efficiency.However,this technology faces a problem of escape of ammonia.This paper focuses on the problem of ammonia escape in ammonia decarburization process,through a series of experiments on NHD(polyethylene glycol dimethy ether)inhibiting effects in bubbling absorption of ammonia.The impacts of NHD and ammonia concentrations on ammonia escape were studied,and NHD inhibition mechanism of ammonia escape was analyzed.The results showed that NHD showed inhibition for ammonia escape and enhanced removal of CO2 at the same time.The amount of escaping ammonia was reduced by 24.86% and the removal efficiency for CO2 increased by about 10% when 5% NHD was added to decarburization solution.The results could provide reference for further research of ammonia method to capture CO2.