System and method for evaporating desulfurization wastewater by utilizing waste heat in flue

Abstract

The invention provides a system and method for evaporating desulfurization wastewater by utilizing waste heat in a flue. The system comprises an air preheater, the flue, an electrostatic dust collector and a desulfurization tower which are sequentially arranged along a flue gas circulation direction; the desulfurization tower is connected with a triple box to obtain pretreated desulfurization wastewater; the air preheater is used for generating hot secondary air by utilizing flue gas waste heat; a desulfurization wastewater atomization assembly is arranged in the flue, and the triple box communicates with the desulfurization wastewater atomization assembly; a first hot secondary air injection pipe assembly is further arranged in the flue, and a first hot secondary air injection pipe assembly is transversely arranged at the bottom of the flue and connected with the air preheater; and the electrostatic dust collector is used for capturing crystalline salt formed after the desulfurizationwastewater is dried and dust in flue gas. The system is simple in structure, convenient to manufacture, capable of effectively improving evaporation of desulfurization wastewater and precipitation ofcrystalline salt, capable of avoiding corrosion of the bottom of the flue and the electrostatic dust collector, capable of saving cost and high in practicability.

Description

technical field [0001] The invention belongs to the technical field of energy utilization and environmental protection, and in particular relates to a system and a method for evaporating desulfurization wastewater by using waste heat in a flue. Background technique [0002] Flue evaporation zero-emission treatment is to pump and spray desulfurization wastewater into the high-temperature flue between the air preheater and electrostatic precipitator of the power plant, and use high-temperature flue gas to evaporate the sprayed and refined wastewater, and the droplets will remain after evaporation. The solid matter that comes down is captured by the electrostatic precipitator. The zero-discharge method of desulfurization wastewater has the advantages of simple process, simple equipment, low investment, and small land occupation. The flue gas temperature is higher than the acid dew point, otherwise it may cause corrosion to the internal components such as the electrode plate of...

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to provide a system and method for evaporating desulfurization wastewater by using waste heat in the flue, so as to at least solve the problem of incomplete evaporation of the desulfurization wastewater droplets in the current flue, which causes the droplets to corrode the flue or accumulate dust at the bottom of the flue. Reduce the problem of corrosion prone to electrostatic precipitators

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