Method and device for thermal activation oxidant and steam combined synergistic flue gas purification

The invention provides a method and a device for thermal activation oxidant and steam combined synergistic flue gas purification. The device comprises a bubble tower, a solution heater, a solution circulating pump, a flue gas inlet, a clean flue gas outlet, a steam inlet, a flushing water system, a demister and a bubbler. Strong-oxidation hydroxyl radicals (.OH) or sulfate radicals (SO4.) are generated by thermal activation decomposition of hyperoxides to serve as oxidants for oxidative removal of SO2, NOx and Hg ; steam is sprayed through steam inlets to form a moisture oversaturated environment in the upper portion of the bubble tower, growth of fine particles carried by flue gas is promoted by heterogeneous coagulation of water drops on surfaces of the fine particles, and the large drops with the fine particles are removed through the demister. The device is simple in structure, small in floor area, low in cost, capable of realizing simultaneous removal of flue gas pollutants including sulfur oxides, ni