Research progress of wet process synergistic desulfurization and decarbonization technology for coal-fired flue gas
Treatment of the SO2 and CO2 in coal-fired flue gas is gradually developing to remove them simultaneously,and combined technologies based on the wet process of desulfurization and decarbonization have thus gained wide attention.Firstly,this paper systematically reviewed the main research directions of the stepwise(sequential)SO2 and CO2 removal technology.It was found that amine degradation caused by SO2 is the core problem for this technology,but the mechanism was still in debate.The roles of desulfurization intensification and amine degradation inhibitors in alleviating the negative effects of SO2 were analyzed from the perspectives of emission control and degradation prevention,respectively.Compared with stepwise treatment,the simultaneous SO2 and CO2 removal technology could achieve cyclic absorption and desorption based on a single solvent.Therefore,the latest progress of the simultaneous SO2 and CO2 removal technology was then summarized,including those using calcium-based,ammonia-based,and amine-based solvents.The principles and process design of each type of absorption system were sorted out and compared,and the most developed one was the ammonia-based combined processes.This paper also briefly described the advantages,disadvantages and development prospects of the two types of synergistic removal technologies.Finally,this paper suggested that future attention for the stepwise SO2 and CO2 removal technology should be focused on the mechanism of SO2 caused amine degradation and its role in the development of degradation prevention measures,while for the combined removal technology,studies on reaction theory and integrated process modeling should be pursued.
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维普
