Roasting flue gas defluorination, dust collection, asphalt fume removal, desulfuration and denitration integral treatment method and system

Abstract

The invention relates to the field of flue gas treatment and in particular to a roasting flue gas defluorination, dust collection, asphalt fume removal, desulfuration and denitration integral treatment method and system. According to the method, roasting flue gas pollutants are thoroughly treated through heat accumulating type incinerator+denitration+alkali dry method adsorption. The system has a structure as follows: a roasting furnace outlet flue is divided into two paths, one path comprises a filter, a heat accumulating type incinerator, a dust collector flue, a circulation fluidized bed reactor, a dust collector, a dust collection rear flue, a draft fan and a chimney which are arranged in sequence; the other path communicates with the lower part in the chimney through an accident flue I and an accident flue III; the accident flue I communicates with the dust collector flue through a pipeline; and the accident flue I communicate with the dust collection rear flue through an accident flue II. The method and system are mainly applied to newly constructed anode roasting flue gas treatment projects, conventional anode roasting flue gas updating and transformation projects and desulfuration treatment projects of boilers and other flue gases.

Description

technical field [0001] The present invention relates to the field of flue gas treatment, in particular to an integrated treatment method and system for defluorination, dust removal, deasphalting fume, desulfurization and denitrification of roasting flue gas. Flue gas upgrading projects, boiler and other flue gas desulfurization treatment projects. Background technique [0002] The main pollutant of the carbon plant in the electrolytic aluminum industry is the roasting flue gas produced during the anode roasting process, which contains harmful components such as asphalt fume, dust, fluoride, sulfur dioxide, nitrogen oxides, and benzopyrene. With the improvement of national environmental protection standards, the country has become more and more strict on various pollutant discharge indicators, and many new and existing enterprises are facing huge environmental protection pressure. The increase in sulfur content in carbon raw materials on the market has led to a substantial i...

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Problems solved by technology

[0015] The purpose of the present invention is to provide an integrated treatment method and system for defluorination, dust removal, deasphalt fume, desulfurization and denitrification of roasting flue gas, so as to solve the problems of high system energy consumption, difficult secondary pollution and high equipment investment in the prior art. , Incomplete treatment of pollutants, serious corrosion of equipment, etc.

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