The invention relates to a
system for recycling SO2 and NO from
oxygen-enriched
combustion boiler fume CO2 collection and belongs to boiler fume
processing equipment. A method for recycling the SO2 and NO from the
oxygen-enriched
combustion boiler fume CO2 collection comprises the following steps of: heating boiler feed water by using the fume discharged by a boiler first; cooling the fume to the temperature of 30 DEG C and pressurizing the fume; reacting the SO2, the NO, O2 and H2O in the pressurized fume in a first contact
tower, wherein the SO2 is totally oxidized to generate SO3 and dilute
sulfuric acid; and continuously pressurizing the reacted fume to finish the recycling of the SO2 and the NO, wherein the NO is oxidized to NO2 in a second contact
tower and is reacted with the water to generate dilute
nitric acid. In the
system, no catalyst is needed, the removal rate of
sulfur oxides approaches 100 percent, and the removal rate of
nitrogen oxides is over 90 percent. The
system has the advantages of reducing content of
residual oxygen and water, improving CO2 purity, reducing CO2 compression
power consumption and
dehydration power consumption, saving devices for low
NOX combustion, desulfurization and denitration, and improving energy utilization efficiency by heating the boiler feed water with the heat of cooled fume, the heat generated by compression and the reaction heat in the contact
tower.