Wet desulfurization system and wet desulfurization method

Abstract

The invention discloses a wet desulfurization system and a wet desulfurization method. A generator and a waste water evaporator are arranged in a split heat pump system to continuously reduce the temperature of sulfur-containing flue gas passing into a desulfurization tower to the acid dew point temperature Below, promote flue gas SO 3 Condensation and fine pollutants grow for the first time. In the wastewater evaporator, sulfur-containing flue gas is used to evaporate desulfurization wastewater, and the water vapor generated is injected into the desulfurization tower to establish a supersaturated water vapor environment and promote the second growth of fine pollutants in the desulfurization flue gas. At the same time, a certain amount of cold and heat is obtained through the generator and deep evaporator. The cold is used for deep cooling of the purified flue gas, creating a supersaturated water vapor environment, and promoting the third growth of fine pollutants. The heat is used for heating and desulfurization. The tower purifies the flue gas, raises its temperature, and eliminates the white smoke phenomenon. In order to achieve the purpose of removing fine pollutants from desulfurization flue gas, eliminating white smoke, and reducing desulfurization wastewater.

Description

technical field [0001] The invention relates to the technical field of desulfurization, in particular to a wet desulfurization system and a wet desulfurization method. Background technique [0002] The flue gas generated by the combustion of boilers, incinerators, catalytic cracking units, etc. needs to be desulfurized before being discharged into the atmosphere. Generally, wet desulfurization is used to treat sulfur-containing flue gas. At present, the purified flue gas after desulfurization still contains a large amount of submicron SO 3 Fog droplets, fine particles, volatile salts and other pollutants are discharged into the atmosphere to form smog weather, which seriously affects the visibility of the surrounding environment and the physical and mental health of residents. The removal efficiency of sub-micron fine pollutants in the desulfurization flue gas is low in the wet desulfurization system, and the removal efficiency generally does not exceed 40%. [0003] For t...

AI Technical Summary

Problems solved by technology

This method relies on injecting cooling water to establish a supersaturated environment, the water consumption of the system is large, the corresponding desulfurization wastewater treatment volume increases significantly, the operating cost of the desulfurization system is high, and this method is easy to break the water balance of the desulfurization system and affect the overall desulfurization efficiency.

[0005] In addition, the above desulfurization methods will also produce a large amount of white smoke after being discharged into the air. In the case of wasting a lot of heat energy and water resources, it will cause strong visual pollution and cause a large burden on desulfurization wastewater treatment.

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