Flue gas desulfurization process and device adopting acetylene sludge-gypsum method

Abstract

The invention discloses a flue gas desulfurization process and a device adopting acetylene sludge-gypsum method. The process comprises the following steps that acetylene sludge is utilized as a desulfurizing agent to carry out wet desulphurization to fuel gas to obtain pure smoke; the process in characterized in that the acetylene sludge is subjected to pulping so as to obtain an acetylene sludge solution, part of clean smoke is agitated into the acetylene sludge solution to carry out bubbling reaction, the acetylene sludge is preprocessed, and the acetylene sludge solution after preprocessing is utilized as the desulfurizing agent to carry out spraying desulfuration through rotational flow separation edulcoration. The device comprises an absorption tower, a circulating pump, a chimney and an outlet smoke channel arranged between the absorption tower and the chimney, as well as a serous fluid preprocessing tank which is internally provided with a bubbling layer and a rotational flow separating device which is connected with the serous fluid preprocessing tank and the inlet of the circulating pump, wherein the bubbling layer is communicated with the outlet smoke channel. According to the invention, the smoke after purification is preprocessed through the acetylene sludge, the quality of the desulfurization gypsum is improved, and the industrial cost is low.

Description

technical field [0001] The invention relates to the technical field of flue gas desulfurization, in particular to a calcium carbide slag-gypsum method flue gas desulfurization process and device. Background technique [0002] Controlling coal-fired boiler flue gas SO 2 In addition to measures such as coal washing, clean coal combustion technology, burning low-sulfur coal and flue gas desulfurization, flue gas desulfurization technology is the most widely used technology. There are hundreds of flue gas desulfurization technologies, and the implementation of desulfurization and dust removal technology is one of them. It is a practical technology developed on the basis of traditional wet dust removal technology in line with China's national conditions. It is especially suitable for large and medium-sized Dust removal and desulfurization of industrial boiler flue gas. [0003] Wet flue gas desulfurization technology is to use liquid absorbent to wash flue gas to absorb SO in e...

AI Technical Summary

Problems solved by technology

[0009] If calcium carbide slag is directly used as a desulfurizer in the traditional limestone-gypsum flue gas desulfurization device for desulfurization, many fatal problems will occur, resulting in the failure of the entire desulfurization device to operate normally.

The sulfide in calcium carbide slag has strong reducibility, and it will perform redox reaction with oxygen in the air prior to calcium sulfite, hindering the oxidation of calcium sulfite, making the whole system unable to produce gypsum; trace silicon oxide And aluminum oxide will form a colloidal substance in the desulfurization system to fill the entire slurry pool. These colloidal substances will form a film with extremely poor air permeability on the surface of the gypsum, which makes the dehydration process of the by-product gypsum very difficult. At the same time, aluminum hydroxide The calcium carbide slag particles will also be wrapped to prevent the dissolution of calcium hydroxide; during the desulfurization process, due to the fast dissolution rate of calcium hydroxide, it is easy to cause the local slurry pH of the device to be too high, resulting in serious structure in some areas and affecting the entire desulfurization process. Serious blockage of the system

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