Efficient method and device for removal of acidic gas from fume or coal gas

Abstract

The invention provides an efficient method and an efficient device for removal of acidic gas from fume or coal gas. The method is characterized by comprising a step of using an aluminium hydroxide (Al(OH)3) or an iron hydroxide (Fe(OH)3) as a deacidification agent for the removal of hydrogen chloride (HCl) or hydrogen fluoride (HF) gas from the fume or the coal gas, wherein the deacidification agent and a carbon dioxide (CO2) in the fume or the coal gas cannot undergo a side reaction, so that the efficient utilization of the deacidification agent is guaranteed. The efficient device for the removal of the acidic gas from the fume or the coal gas comprises an acid-resisting temperature reduction device, an acid-resisting bag dust removal system, a primary deacidification system, a secondary deacidification system and a draught fan. After the fume or the coal gas passes through the acid-resisting temperature reduction device, the acid-resisting bag dust removal system, the primary deacidification system and the secondary deacidification system sequentially, temperature reduction and dust removal of the fume or the coal gas can be realized, and the HCl or HF gas can be efficiently removed from the fume or the coal gas more importantly, so that the aims of cleaning discharge and prevention of combustion equipment corrosion are achieved.

Description

technical field [0001] The patent of the present invention relates to an acid gas purification device, especially a high-efficiency purification device suitable for deacidification of flue gas or coal gas in incinerators and submerged arc furnaces, which belongs to the field of environmental protection technology. Background technique [0002] In the production of modern industrial devices (such as incinerators and submerged arc furnaces, etc.), it is easy to produce a certain amount of HCl, HF, SO 2 or H 2 Flue gas or coal gas of acid gases such as S, usually containing CO, CO 2 , if these acid gases are directly discharged into the atmosphere, it will cause serious environmental pollution, and it will also corrode equipment during the high-temperature heat exchange process. In order to protect the environment and prevent equipment corrosion, these acid gases must be purified. After the flue gas passes through the deacidification device, clean gas can be obtained, so as ...

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Problems solved by technology

[0003] The usual acid gas purification device adopts lye deacidification method, and the alkaline solution is NaOH or Ca(OH) 2 , these added deacidifiers can often also interact with CO 2 Reaction, that takes place: 2NaOH+CO 2 =Na 2 CO 3 +H 2 O or Ca(OH) 2 +CO 2 =CaCO 3 +H 2 The side reactions of O consume a large amount of effective deacidification components in the lye. These side reactions reduce the deacidification efficiency, resulting in excessive consumption of deacidification agents, and the lye must be frequently updated. Therefore, it is necessary to design a method for removing flue gas or High-efficiency device for acid gas in coal gas, thoroughly deacidifies flue gas or coal gas produced by incinerators and submerged arc furnaces

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