Blast furnace gas organic sulfur removal method

Abstract

The invention relates to a blast furnace gas organic sulfur removal method, which is characterized by comprising the following steps: S1, primarily filtration of blast furnace gas; s2, absorption by an absorption tower; s3, desorptive regeneration; and S4, desorptive regeneration again. The invention also discloses the desulfurized blast furnace gas prepared according to the blast furnace gas organic sulfur removal method. The method for removing the organic sulfur from the blast furnace gas is simple in process, easy to operate, suitable for continuous large-scale production, capable of rapidly, safely and efficiently removing the organic sulfur from the blast furnace gas, good in removal effect, high in efficiency, small in secondary pollution and capable of achieving organic unificationof economic benefits, social benefits and ecological benefits.

Description

technical field [0001] The invention relates to the technical field of blast furnace gas purification, in particular to a method for removing organic sulfur from blast furnace gas. Background technique [0002] Blast furnace ironmaking is one of the important processes of modern iron and steel production. The reducing agents used in ironmaking blast furnaces are coke, coal, heavy oil, etc., and the reducing agent CO is produced by air blast and provides high-temperature heat. Due to the high nitrogen content in the air, dilution The CO in the reducing gas is removed, so the CO content in the blast furnace gas is low and the nitrogen content is high. The typical blast furnace gas contains CO: 24-26%; CO 2 14-16%; H 2 1-2%;CH 4 0.3-0.8%;N 2 56-59%. Calorific value: 3200-4000kJ / Nm 3 ; In addition, there is H in the blast furnace gas 2 S. CO S , SO 2 , SO 3 and other sulfides. The blast furnace gas containing sulfide is directly used as fuel for boilers in power pl...

AI Technical Summary

Problems solved by technology

The desulfurization process of traditional acid-base neutralization cannot be efficiently removed, and at the same time it will increase the environmental protection investment of subsequent blast furnace gas users such as hot blast stoves, sintering machines, pellet furnaces, heating furnaces, and boiler power generation

At present, a relatively mature method is to install a wet scrubbing device after the TRT device to remove acid gas. This method can effectively remove acid gas H in blast furnace gas. 2 S, SO 2 , SO 3 and other acid gases, but COS in the blast furnace gas cannot be removed, resulting in SO in the flue gas after combustion 2 Excessive content

Another method is to desulfurize in the flue gas, but because the volume of the flue gas increases several times after combustion, and the temperature is high and the pressure is low, the flue gas desulfurization has huge equipment, large water consumption, and the circulating water needs to be treated and removed separately. High cost, secondary pollution, etc.