Method for removing sulfur dioxide in flue gas with white slime and device

Abstract

The invention discloses a method for removing sulfur dioxide in smoke by using white mud, which uses the white mud plasma as desulfurization solution, and implements the two-stage absorption desulfurization to the sulfur dioxide in smoke and then dissipates fog and discharges the smoke. The desulfurization solution absorbed in the first stage is collected at a low position, and is stored for recycling thereby forming a low position cycle, and the desulfurization solution absorbed in the second stage is collected at a high position, and is stored for recycling thereby forming a high position cycle; the desulfurization solution stored in the high position cycle overflows to the low position cycle, and the desulfurization gypsum generated in the low position cycle is pumped out for cyclone separation, top-flowing thin gypsum plasma refluxes to the high position cycle, and the bottom thick gypsum plasma is treated for deslagging. The invention also discloses a device for realizing the method. The inventive method and device has reasonable design and can effectively improve desulfurization efficiency.

Description

technical field [0001] The invention relates to the technical field of environmental protection and resource utilization, in particular to a method and a device for removing sulfur dioxide in flue gas with lime mud. Background technique [0002] White mud, as a kind of waste from papermaking enterprises, contains a large amount of calcium carbonate. Due to the high alkali content in white mud, direct discharge will cause serious pollution and harm to the environment; the cost of its treatment is high, so most enterprises still use foreign landfill or direct discharge. Using lime mud to remove sulfur dioxide in flue gas can not only solve the problem of waste disposal and pollution, but also greatly reduce the cost of desulfurization. At present, there have been many reports on the use of lime mud as a desulfurizer, the main ones are as follows: [0003] The Chinese patent application with the application number 200510200279.9 adopts a single-loop liquid circulation system,...

AI Technical Summary

Problems solved by technology

This invention adopts the traditional limestone-gypsum desulfurization process, and only uses white clay instead of absorbent in the selection of absorbent, without fully considering the characteristics of white clay, that is, white clay contains quantitative reducing substances and requires a lower pH value to Preparation of desulfurization gypsum, and the method adopted requires a large liquid-gas ratio to ensure desulfurization efficiency due to the low pH value of the control

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