High-temperature coal gas treatment system adopting smelting reduction process for iron making

Abstract

The invention discloses a high-temperature coal gas treatment system adopting a smelting reduction process for iron making, and belongs to the technical field of smelting coal gas treatment. Waste heat of high-temperature coal gas generated by a smelting and reducing furnace is recycled through a vaporization fume hood and a waste heat boiler; after high-temperature cyclone and coarse dust-removaltreatment, a dry-process cloth bag dust remover is used to perform coal gas secondary dust removal; dust content of purified coal gas is smaller than 5 mg / Nm<3>; and purified coal gas is sprayed andcooled through a washing tower, and concentration of corrosive elements in coal gas is reduced, so that dehydrated purified coal gas is supplied to a user to use. Sludge treatment link in an existingprocess is cancelled, and environmental pollution is reduced; content of the purified coal gas is reduced, and energy and power consumption in existing process production are reduced; the purified coal gas which passes through the dry-process cloth bag dust remover is in series connection with the washing tower for spraying water and removing impurity elements, so that corrosion on a coal gas pipeline system is reduced; and fly ash is returned to a smelting reduction furnace, so that cyclic utilization of carbon-containing resources is realized.

Description

technical field [0001] The invention belongs to the technical field of smelting gas treatment, and in particular relates to a high-temperature gas treatment system for smelting reduction ironmaking process. Background technique [0002] At present, in the smelting reduction ironmaking process, the temperature of the high-temperature gas coming out of the gas outlet of the smelting reduction furnace is between 1480 and 1650 ° C, and the gas volume per ton of iron is about 2200 to 2400 Nm 3 / tHM, the dust content of high temperature gas is 20~80g / Nm 3 , the high-temperature gas is recovered by waste heat and then wet dust removal to produce clean gas for use by users. [0003] The existing process adopts the traditional wet dedusting process. Compared with this process, the widely used dry dedusting process has many advantages: water does not participate in gas purification, and water consumption is low; electric energy is only used for part of the valve drive and auxiliary c...

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Problems solved by technology

[0004] Moreover, the wet dedusting process adopted in the existing process produces a large amount of sewage, and a sewage treatment system needs to be designed. The dedusting ash treatment process is relatively complicated, difficult to control, and has secondary pollution, which needs to be improved

At present, the dry dedusting technology of blast furnace gas has encountered the problem of serious corrosion of gas pipelines, which has brought serious threats to the safe operation of iron and steel plants.

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