A device and method for desulfurizing and decarbonizing flue gas by using calcium carbide slag

Abstract

The invention discloses an apparatus and a method for desulfurization and decarbonization to flue gas by means of carbide slag. In the method, the carbide slag is dissolved in water to perform decarbonization for producing calcium carbonate; then the calcium carbonate and reductive substances in the carbide slag are separated through sedimentation effect of a sedimentation tank; finally the carbide slag is fed into a desulfurization column to perform desulfurization or discharge. Through the reasonable process design, a problem of oxidization of calcium sulfite, generated after the desulfurization, due to interference of the reductive substances in the carbide slag can be completely avoided.

Description

technical field [0001] The application relates to a device and method for desulfurization and decarbonization of flue gas, in particular to a device and method for desulfurization and decarbonization of flue gas using carbide slag as raw material. Background technique [0002] The country pays more and more attention to environmental protection, and the development of SO 2 The governance work has become an important task of the current thermal power plant. my country's major factories, especially thermal power plants, started late in the desulfurization of flue gas. There are still relatively few mature desulfurization technologies, and most of them are still in the stage of accumulating engineering experience. Whether using CaCO 3 , CaO or Ca(OH) 2 , the common principle is through chemical reaction to make calcium element Ca(OH) 2 Form and SO in flue gas 2 reaction to generate CaSO 3 and CaSO 4 . [0003] And with Ca(OH) 2 Carbide slag, the main component, is prod...

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Problems solved by technology

[0004] Since the main component of carbide slag is Ca(OH) 2 Therefore, many enterprises and scientific research institutes have carried out research work on desulfurization using carbide slag as raw material, but generally speaking, this work is still in the laboratory stage

One of the main reasons is that calcium carbide slag contains a certain amount of reducing ions, especially S2-, which absorbs SO 2 Not much effect, but it seriously affects the oxidation of sulfite

In response to this problem, Hangzhou Tianlan Environmental Protection Equipment Co., Ltd. proposed a method of oxidation outside the tower, and some companies also proposed to add a strong oxidant to carbide slag to oxidize sulfide, but the effect of the above method in practice is not significant

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