Coal-fired flue gas purification process and equipment thereof

According to the coal-fired flue gas purification process and equipment, flue gas of a coal-fired furnace firstly enters the gas-gas heat exchanger for heat exchange and cooling, then enters the air preheater for heat exchange and cooling through the waste heat boiler and the coal economizer, then enters the electric bag dust collector to remove dust in the flue gas, and finally passes through the induced draft fan; according to the technical scheme, ammonium sulfite and ammonium sulfate crystals are effectively eliminated in the air preheater, the maintenance frequency of the equipment is greatly reduced, the energy consumption of the equipment is reduced, the energy consumption of the equipment is reduced, the energy consumption of the equipment is reduced, and the energy consumption of the equipment is reduced. By adopting the process and the equipment, the cycle operation time is greatly prolonged, the service life of the low-temperature catalyst is prolonged, and the production efficiency is further impr