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This paper presents the study on co-capture of SO2 and NOx in O2/CO2 recycled coal combustion in a pilot scale facility with the heat input of 0.3 MW by using high-sulphur lean coal.Detailed comparison of SO2 and NOx emission indexes and desulphurization and denitration rates have been made among three working conditions of O2/CO2,O2/CO2 with limestone injection(O2/CO2+Ca) and O2/RFG(recycled flue gas) with limestone injection(O2/RFG+Ca).Combustion in air was performed as a base case.Results showed that in the O2/RFG with limestone injection,desulphurization and denitration rates could reach up to 96% and 89%,respectively.Limestone injection under the high-CO2 atmosphere caused a significant reduction on SO2 emission and NOx emission as well.This indicated O2/CO2 recycled coal combustion could reduce the investment on the flue gas purification.The techno-economic evaluation indicated that Oxy-combustion technique is not only feasible for CO2 emission control based on existing power plants but is also cost-effective.
This paper presents the study on co-capture of SO2 and NOx in O2 / CO2 recycled coal combustion in a pilot scale facility with the heat input of 0.3 MW by using high-sulfur lean coal. Did not differ SO2 and NOx emission indexes and desulphurization and denitration rates have been made among three working conditions of O2 / CO2, O2 / CO2 with limestone injection (O2 / CO2 + Ca) and O2 / RFG (recycled flue gas) with limestone injection (O2 / RFG + Results were showed that the O2 / RFG with limestone injection, desulfurization and denitration rates could reach up to 96% and 89% respectively. Limestone injection under the high-CO2 atmosphere caused a significant reduction on SO2 emission and NOx emission as well. which O2 / CO2 recycled coal combustion could reduce the investment on the flue gas purification. the techno-economic evaluation indicates that Oxy-combustion technique is not only feasible for CO2 emission control based on existing power pla nts but is also cost-effective.