Converter gas purification and recovery process and system

Abstract

The invention belongs to the technical field of gas purification and discloses a process and a system for purifying and reclaiming converter coal gas. The process comprises: cooling down high-temperature dust-laden flue gas generated by a converter during oxygen blast smelting to between 800 DEG C and 1,000 DEG C by a gasification cooling system; injecting dust-laden coal gas into a saturated spray tower through a water seal; carrying out heat mass exchange between the coal gas and water mist inside the saturated spray tower; removing most dust and dropping the removed dust into a dust hopper along with mechanical water so as to be fed into the water seal; meanwhile, cooling down the coal gas to 70 DEG C approximately, and injecting the coal gas into a sinter-plate filtration dust catcher for filter purification after the coal gas is dehydrated by a dehydration tower; and respectively reclaiming or dispersing the purified coal gas by a three-way switch valve according to the coal gas reclaiming conditions of the system. The process and the system have the advantages of high coal gas purification efficiency, low system operation resistance and energy consumption and long sinter-plate service life, and the dust concentration of the purified coal gas is less than 10mg / m<3> (under the standard condition); moreover, the process and the system are novel technology with high popularization value, energy conservation and environmental protection, and can be widely used in the converter coal gas purifying and reclaiming system.

Description

technical field [0001] The invention belongs to the technical field of gas purification. The invention relates to the gas purification produced in the steelmaking process of the iron and steel industry, discloses a converter gas purification and recovery process and system, and particularly relates to a converter gas plastic burning plate filter type Purification recovery process and system. Background technique [0002] The temperature of the converter gas at the furnace mouth of the converter is 1450-1650°C, after being cooled to 800-1000°C by the vaporization cooling system, it enters the purification and recovery system. At present, there are two main types of converter gas purification and recovery processes: wet method and dry method (abbreviated as LT). The wet process mainly includes two types of text one tower (abbreviated as OG) and circular seam washing (abbreviated as RSW). [0003] The wet OG purification system is mainly composed of a two-stage Venturi tube p...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a purification and recovery process and system, which solves the problems of high dust concentration in the dust discharge of wet OG and high energy consumption of the system and large system resistance loss as in wet RSW. The dust emission dust concentration is less than 10mg / m 3 (standard condition)

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