Clean flue gas recycling type desulfurization waste water spraying system

Abstract

The invention discloses a clean flue gas recycling type desulfurization waste water spraying system comprising a clean flue gas recycling passage, a recycling fan, a tube-and-shell heat exchanger, a spraying evaporating column, a desulfurization waste water pipe, and a bypass flue. The recycling fan, the tube-and-shell heat exchanger and the spraying evaporating column are mounted in order behind the clean flue gas recycling passage. The desulfurization waste water pipe is communicated with the spraying evaporating column. The bypass flue is mounted between a boiler and an air preheater and is communicated with a raw flue gas inlet of the tube-and-shell heat exchanger. An outlet, for raw flue gas subjected to heat exchanging, of the tube-and-shell heat exchanger is communicated with an outlet of the air preheater and an outlet of the spraying evaporating column and is then connected to an inlet of an electric precipitator; an outlet of the electric precipitator is communicated with a desulfurization column and a draught fan in order. The system is applied to heating and spraying the desulfurization waste water, so that the evaporated clean flue gas is hot and dust free, evaporating speed is high, and dust caking rarely occurs; the hot flue gas and the desulfurization waste water are sprayed and evaporated in an independent reaction container, low influence is caused to the original system, and start-stop and maintenance are facilitated.

Description

technical field [0001] The invention relates to the technical field of thermal power generation, in particular to a clean flue gas recirculation type desulfurization wastewater spray treatment system. Background technique [0002] Since 2014, my country has further increased the SO2 of coal-fired power plants. 2 , NO x And the discharge standard of smoke and dust has reached a level superior to the international advanced standard. In order to achieve the goal of pollutant control, the traditional single-stage desulfurization tower layout often cannot meet the SO2 at the chimney outlet. 2 Emission concentration does not exceed 35mg / m 3 The limit value, but the arrangement of two-stage towers in series or two-stage towers in parallel is required. In addition, the desulfurization system needs to run around the clock to meet the real-time data monitoring needs of the environmental protection department. In order to meet the needs of the normal operation of the desulfurizati...

AI Technical Summary

Problems solved by technology

The flue gas used to heat desulfurization wastewater in this system contains almost no dust, so the problem of ash accumulation and agglomeration is fundamentally solved. The treated wastewater enters the desulfurization system, and the precipitated salt particles are captured by the dust collector, thereby realizing Realized "zero discharge" of desulfurization wastewater

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