Dust removal/hydrolysis integrated desulfurization system for blast furnace gas

Abstract

The invention provides a dust removal / hydrolysis integrated desulfurization system for blast furnace gas, belonging to the technical field of fine desulfurization of blast furnace gas. The system comprises a dust removal / hydrolysis integrated system and a desulfurization system, wherein the dust removal / hydrolysis integrated system is formed by connecting a plurality of dust removal / hydrolysis integrated devices in parallel, and cut-off valves are arranged between the devices and a main gas pipeline. According to the invention, blast furnace gas firstly enters the dust removal / hydrolysis integrated devices through a raw gas pipe network, and raw gas enters from the lower parts of the devices; firstly, dust in the gas is captured through cloth bags, the captured dust is conveyed to ash bins, and the gas having been subjected to dust removal is converted into hydrogen sulfide through hydrolysis catalyst bed layers; the blast furnace gas having undergone dust removal and hydrolysis entersa desulfurization tower of the desulfurization system; and purified clean gas is converged into a clean gas main pipe network. According to the invention, dust removal of the gas and catalytic hydrolysis of carboxyl sulfur in the gas are combined into the same device, and a gas hydrolysis reactor does not need to be independently arranged, so the occupied area of the gas desulfurization system isreduced, system investment is reduced, and cost is saved.

Description

technical field [0001] The invention relates to the technical field of fine desulfurization of blast furnace gas, in particular to an integrated desulfurization system for blast furnace gas dedusting and hydrolysis. Background technique [0002] Blast furnace gas is a by-product of the blast furnace ironmaking process, which can be used as fuel and widely used in boilers, blast furnace hot blast stoves, steelmaking heating furnaces and other processes. The main components of blast furnace gas are: dust, carbon monoxide, carbon dioxide, nitrogen and sulfides, etc. Among them, the sulfides are organic sulfur and inorganic sulfur. The organic sulfur mainly includes: carbonyl sulfide, carbon disulfide, etc. The inorganic sulfur lard component is hydrogen sulfide , sulfur dioxide, etc. The total sulfur content in blast furnace gas is generally 60-100mg / Nm 3 , of which organic sulfur accounts for 3 / 4 and inorganic sulfur accounts for 1 / 4. Unpurified blast furnace gas is burned ...

AI Technical Summary

Problems solved by technology

The system needs to set up multiple hydrolysis towers and desulfurization towers independently, and the utilization rate of the site is low. It is difficult to implement in iron and steel enterprises with tight sites.

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