Carbon roasting smoke calcium hydroxide desulfurization and defluorination purification method and device

Abstract

The invention relates to a carbon roasting smoke calcium hydroxide desulfurization and defluorination purification method and device. A preliminary dust remover arranged on an outlet of a roasting furnace is used for removing tar and dust; smoke enters a full-evaporation dry bottom type cooling tower to be subjected to spraying cooling; after cooling, the smoke enters an adsorption reaction separator, the smoke and inner circulation calcium hydroxide adsorption agents are subjected to a primary adsorption reaction, materials collected in the adsorption reaction separator are conveyed to a fluoride-containing stock bin through a conveying device to be stored; the smoke and added fresh calcium hydroxide adsorption agents are subjected to secondary adsorption reaction through a desulfurization and defluorination reactor, and the desulfurization and defluorination process is performed; then the smoke enters a cloth bag dust remover and is subjected to the gas and solid separation filtering process, and gas generated after separation and filtration is discharged from a chimney through an induced draught fan. Sulfur dioxide, fluoride, dust and tar in the smoke are removed while calcium hydroxide is adopted, the purposes of desulfurization, defluorination and dust removal are achieved, and the method and device have the advantages that the technology is reasonable and simple, operation is convenient, equipment is easy to manufacture, cost is low, the floor space is small, maintenance is easy, running is reliable, and service life is long.

Description

technical field [0001] The invention relates to the technical field of carbon roasting flue gas purification, in particular to a purification method and device for calcium hydroxide desulfurization and fluorine removal of carbon roasting flue gas. It can effectively deal with sulfur dioxide, fluoride, tar, benzopyrene and other harmful substances in the flue gas of carbon roasting. Background technique [0002] At present, carbon plants equipped with electrolytic aluminum plants generally use desulfurization devices + alumina to absorb tar and fluoride in the flue gas. After the adsorption reaction, the surface of alumina contains tar, which will bring about the production process of subsequent electrolytic aluminum production. Fluctuation, due to the back-and-forth transportation of alumina, increases production costs and increases the damage of alumina. The use of wet desulfurization is likely to cause secondary pollution. If the carbon plant does not have a matching ele...

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Problems solved by technology

The use of wet desulfurization is easy to cause secondary pollution

If the carbon plant does not have a matching electrolytic aluminum plant, the electric tar collector is generally used to treat the tar in the flue gas. The flue gas purified by the electric tar collector cannot meet the current national emission standards. At the same time, the electric tar collector , the equipment is unstable, and there are safety factors such as fire

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