Process and equipment for flue gas roasting, adsorption desulfurization, dust removal and purification by adopting combination process

Abstract

The invention relates to a process and equipment for flue gas roasting, adsorption desulfurization, dust removal and purification by adopting a combination process. Tar and dust in flue gas are gathered by a spraying tower having a cooling function and an electrical tar precipitator, and fluorine, SO2, NOX, dust and harmful substances, such as tar and dust which are not electrically gathered, in flue gas are adsorbed by using calcium hydroxide. The process disclosed by the invention has the advantages of simple process flow, small occupied area, low investment and low energy consumption; the equipment for comprehensive adsorption desulfurization, dust removal and purification by adopting a set of electric trapping dry process can be used for simultaneously removing multiple harmful substances from the flue gas, thoroughly purifying the flue gas at one step, and effectively overcoming the technical difficulty that multiple harmful substances in the flue gas cannot be removed until multiple sets of purification equipment are simultaneously used; the harmful substances in the flue gas can be removed at a distinct gradation and a high efficiency, and the emission concentration of the flue gas is superior to a national emission standard.

Description

technical field [0001] The invention relates to a roasting flue gas purification technology, in particular to a combined method roasting flue gas adsorption desulfurization and dust removal purification process and equipment. Background technique [0002] The flue gas produced by the carbon plant roaster contains a large amount of sulfide, fluoride, tar, dust, NO N , benzopyrene and other harmful substances, these substances will cause serious harm to animals, plants and human body, especially the acid gas SO 2 , NO x And HF is highly corrosive, and the multi-type carcinogen benzopyrene is more harmful. At present, most of the treatment of carbon roasting flue gas adopts a single electric tar catcher or the rear end of the electric tar catcher is equipped with alumina adsorption dry purification equipment. This kind of purification equipment can only collect tar, dust, FH, and less Some benzopyrene, sulfur-containing substances in the flue gas, nitrogen dioxide, nitric ox...

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Problems solved by technology

[0003] In the existing process technology, the common process is to use alumina as the vicinity of the roasting flue gas of the carbon plant, and, according to the needs, use the electric tar collector as the tar and dust in the flue gas. However, due to the oxidation Aluminum itself has very low ability to adsorb and react to sulfur oxides and nitrogen oxides. The electric tar collector uses a high-voltage electric field as a means of capturing tar, which will generate a certain amount of nitrogen oxides; in this way, it will make nitrogen oxides and The pollution problem of sulfide is difficult to be solved

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