Blast furnace gas hydrolysis and dry-process fine desulfurization treatment system and method

Abstract

The invention provides a blast furnace gas hydrolysis and dry fine desulfurization treatment system and method. The system comprises a gas cooling heat exchanger, a catalytic hydrolysis tower, a hydrogen sulfide adsorption tower and a catalytic oxidation tower. Blast furnace gas firstly enters the gas cooling heat exchanger to be cooled, the gas temperature is reduced by 5 DEG C through the cooling heat exchanger, and part of moisture is separated out. Then the blast furnace gas enters a catalytic hydrolysis tower, organic sulfur contained in the gas is converted into inorganic sulfur after passing through a hydrolysis catalyst, the hydrolyzed blast furnace gas is heated by a reheater at the front end of an adsorption tower and enters a hydrogen sulfide adsorption tower, and the inorganicsulfur in the gas is removed through a catalyst in the tower. The blast furnace gas without the inorganic sulfur can be directly conveyed to a downstream client side, and a catalytic oxidation step can also be added after hydrogen sulfide is adsorbed to remove COS, H2S and other sulfur-containing substances. The blast furnace gas hydrolysis reaction time only needs 1-3 seconds, the conversion ratecan reach 98% or above, the removal efficiency of the hydrogen sulfide adsorption catalyst is 90% or above, and the removal efficiency in the catalytic oxidation tower reaches up to 70% or above.

Description

technical field [0001] The invention belongs to the technical field of atmospheric control, and in particular relates to a blast furnace gas hydrolysis and dry fine desulfurization treatment system and method. Background technique [0002] In order to continuously improve the ambient air quality and promote the reduction of air pollutant emissions, the state has put forward higher requirements for air pollutants in various regions, especially for iron and steel enterprises to fully implement ultra-low emission standards. At this stage, production lines such as steel sintering and pelletizing have successively achieved ultra-low emissions, while production lines such as blast furnace gas, hot blast stoves, and heating furnaces have just begun to implement ultra-low emission indicators. In recent years, with the vigorous development of energy saving and emission reduction in steel mills and circular economy, as well as the continuous strengthening of national environmental pro...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a blast furnace gas hydrolysis and dry fine desulfurization treatment system and method, which mainly solves the problem of waste water in the conventional wet desulfurization process of iron and steel blast furnace gas, the difficult problem of dry adsorption saturation analysis and regeneration, and the total sulfur content of outlet gas Unable to meet the challenge of ultra-low emissions

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