Flue gas adsorption desulfurizer and preparation method thereof

Abstract

A flue gas adsorption desulfurizer is prepared from the following raw materials by weight: 100-120 parts of charcoal, 10-12 parts of zinc chloride, 30-35 parts of magnesium chloride, 20-24 parts of calcium oxide, 50-55 parts of attapulgite, 20-24 parts of straw, 3-4 parts of expandable graphite, 30-35 parts of expanded perlite, 30-35 parts of eclipta alba, 15-18 parts of raw radix astragali, 12-14 parts of peanut shells, 2-3 parts of glycerin, 2-3 parts of stearic acid polyoxyethylene ester, 4-5 parts of auxiliary agents, and a proper amount of water. By using plant raw materials such as straw and the like, through high temperature charring and processing with chemicals such as zinc chloride and the like, the desulfurizer of the invention is provided with a form with a developed pore structure and a large specific surface area, has high-efficient adsorption effect, also generates alkaline substances, and realizes high-efficient desulfurization; by using expandable graphite, expanded perlite and attapulgite, the desulfurizer of the invention has developed pores, and increased desulfurization capacity; the desulfurizer of the invention can also reduce the discharge of harmful gas such as flue dust, carbon monoxide, and the like, and reduce flue gas blackness.

Description

Technical field [0001] The invention relates to a desulfurizer, in particular to a flue gas adsorption desulfurizer and a preparation method thereof. Background technique [0002] At present, there are three main methods for flue gas desulfurization: one is the combustion method of sulfur fixation, which is to add a certain amount of sulfur fixation agent to the coal, so that the sulfur dioxide generated during the combustion of the coal reacts with the sulfur fixation agent, and the sulfate is discharged together with the slag , This method is costly. The other method is wet desulfurization. The spray method is mainly used to absorb sulfur dioxide in the flue gas with an alkaline aqueous solution. This method uses a large amount of water, and the product after desulfurization is difficult to handle, which is prone to secondary pollution and high investment costs. Large area, high equipment anti-corrosion requirements. Another method is the activated carbon adsorption method. T...

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Problems solved by technology

Another method is wet desulfurization, which mainly adopts spraying method, and uses alkaline aqueous solution to absorb sulfur dioxide in flue gas. Large area, high requirements for equipment anti-corrosion

Another method is the activated carbon adsorption method, which has a short service life of activated carbon, complicated regeneration, low desulfurization efficiency, large water consumption for washing, easy to cause secondary pollution, and high price of activated carbon, which increases the cost.

[0003] There are two main ways to remove NO and NO2 from flue gas. One is to reduce NO and NO2, such as using ammonia (NH3) as a reducing agent to reduce it to nitrogen. It is necessary to continuously adjust NH3 according to the operating load of the boiler. The amount of injection and the location of injection to ensure that NH3 is injected at the optimum temperature, this method has high operating costs; the other is to convert it into nitrate by oxidation, so as to achieve the purpose of removing NO and NO2