Wet desulfurization system and wet desulfurization method

Abstract

The application provides a wet desulfurization system and a wet desulfurization method, which relate to the technical field of desulfurization, wherein the wet desulfurization system includes a waste liquid evaporator, a desulfurization tower, a negative pressure evaporator and a settling tank; The higher temperature flue gas is used to treat desulfurization wastewater, and the temperature of the circulating slurry is reduced by means of negative pressure evaporation and cooling. At the same time, the unsaturation of the purified flue gas is greatly increased by means of air mixing, thereby achieving the deep elimination of white smoke and zero discharge of desulfurization wastewater. The purpose, and use the principle of condensation phase change to further reduce the content of fine particles in the flue gas, to achieve ultra-clean emission of flue gas.

Description

technical field [0001] The present application 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 produced by combustion of boilers, incinerators, and catalytic cracking units needs to be desulfurized before it can be discharged into the air. Desulfurization generally adopts wet desulfurization. After desulfurization, the temperature of the flue gas decreases, and the water vapor in the flue gas is in a supersaturated state. When the flue gas is discharged into the air, it will produce a large number of small water droplets to form white smoke when it is cold, which not only wastes a lot of heat energy and water resources, but also causes strong visual pollution; and, the small liquid droplets condensed by water vapor and the flue gas The residual aerosols and fine particles in the air can easily form smog, seriously affecting the visibility of the surro...

AI Technical Summary

Problems solved by technology

[0002] The flue gas produced by combustion of boilers, incinerators, and catalytic cracking units needs to be desulfurized before it can be discharged into the air. Desulfurization generally adopts wet desulfurization. After desulfurization, the temperature of the flue gas decreases, and the water vapor in the flue gas is in a supersaturated state. When the flue gas is discharged into the air, it will produce a large number of small water droplets to form white smoke when it is cold, which not only wastes a lot of heat energy and water resources, but also causes strong visual pollution; and, the small liquid droplets condensed by water vapor and the flue gas The residual aerosols and fine particles in the air can easily form smog, which seriously affects the visibility of the surrounding environment and the physical and mental health of residents.

[0003] In order to solve the above problems, condensation, reheating, mixing and mutual combination are generally used to solve the white smoke problem of desulfurization flue gas; but the above-mentioned technology needs to consider the problem of low-temperature cold source and high-temperature heat source, and the temperature rise of the flue gas is limited. The ability to eliminate white smoke needs to be improved; at the same time, the desulfurization wastewater generated by wet flue gas desulfurization is generally treated through neutralization, sedimentation, oxidation, clarification and other steps in conventional processes, but it is difficult to achieve zero discharge of desulfurization wastewater after treatment

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