Dry process and wet process combined smoke gas desulfuration system

Abstract

The invention discloses a dry process and wet process combined smoke gas desulfuration system, which consists of a dry process desulfuration system and a wet process desulfuration system, wherein the wet process desulfuration system comprises a backflow water tank, a wet process absorption tower and a limestone slurry box, the dry process desulfuration system comprises a dry process absorption tower, a water tank, a slaked lime cabin and an electric dust remover, the dry process absorption tower is connected with the backflow water tank, the water tank is respectively connected with the wet process absorption tower and the limestone slurry box, and the electric dust remover is connected with the wet process absorption tower. The dry process and wet process combined smoke gas desulfuration system has the advantages that the redundancy of the sulfur content of firing coal in an electric plant is improved, the tail end wet process desulfuration liquid-gas ratio can be reduced, and the generated waste water can be used as process water for semi-dry process desulfuration, so the zero waste water discharge is realized.

Description

technical field [0001] The invention relates to a flue gas desulfurization system, in particular to a combined dry and wet flue gas desulfurization system for high-sulfur coal power plants. Background technique [0002] The acid rain formed by sulfur dioxide emitted by thermal power plants has seriously endangered the living environment of human beings. The country mandates that thermal power plants must install flue gas desulfurization devices. However, limited by technical and economic conditions, it is necessary to develop desulfurization technologies and processes that have strong applicability to coal combustion, high desulfurization rate, high system availability, simplified process, low system power consumption, and low investment and operating costs. . [0003] At present, the initial investment cost of the wet desulfurization system is too high, the operating cost is also high, the floor area is large, the system management operation is complicated, the wear and co...

AI Technical Summary

Problems solved by technology

However, limited by technical and economic conditions, it is necessary to develop desulfurization technologies and processes that have strong applicability to coal combustion, high desulfurization rate, high system availability, simplified process, low system power consumption, and low investment and operating costs.

[0003] At present, the initial investment cost of the wet desulfurization system is too high, the operating cost is also high, the floor area is large, the system management operation is complicated, the wear and corrosion phenomenon is relatively serious, the by-product - gypsum is difficult to handle (it can only be stacked due to market problems), and the waste water is relatively large. intractable

Affected by the current situation of domestic power coal supply, the sulfur content is high, and the coal source of many power plants is unstable, and the sulfur content of coal-fired fluctuates greatly, which has caused great difficulties to the operation of the wet desulfurization system

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