PILOT APPLICATION OF HYDROLYSIS ADSORPTION DESULFURIZATION OF BLAST FURNACE GAS
The desulfurization of blast furnace gas is of great significance for promoting the entire process of ultra-low emissions in the steel industry.In response to the emission characteristics of high gas volume,frequent fluctuations,high pressure,and complex components of blast furnace gas,a hydrolysis adsorption desulfurization process for blast furnace gas was proposed,and constructed and operated a pilot system,and evaluated the operating effect.The operational effectiveness of the pilot system was evaluated.The results show that the COS hydrolysis conversion rate and H2S removal efficiency of the hydrolysis adsorption process can reach 98.7％and 97.7％,respectively.After purification,the COS content in blast furnace gas is less than 1.5 mg/m3 and the H2S content is less than 3 mg/m3,meeting the ultra-low emission requirements of the country and various regions;The resistance of the hydrolysis tower developed is less than 3 kPa,and the resistance of the adsorption tower is less than 1 kPa.With the extension of time,the resistance does not show a significant upward trend,and the reactor can operate smoothly for a long time;After the reaction,the K relative content of γ-A12O3 hydrolysis catalyst decreased by 7.1％,and the S relative content increased by 9.3％.The alkaline component of the catalyst was consumed,and there were deposits of sulfur or sulfate on the catalyst surface,but the consumption and deposition were not significant.The specific surface area of the hydrolysis catalyst decreased by 6.20％and the pore volume decreased by 9.30％,indicating that the sulfur deposition after the reaction blocked the pores to a certain extent,but the bulk density and compressive strength of the hydrolysis catalyst the reaction did not show significant changes;After the reaction,the Fe relative content of γ-Fe2 O3 adsorbent decreased by 5.4％,the S relative content increased by 13.2％,the specific surface area decreased by 15.02％,and the pore volume decreased by 11.76％.The generated iron sulfide,ferrous sulfide,and sulfur elemental substances significantly increased the S content of the adsorbent,leading to a decrease in the specific surface area of the adsorbent and blockage of the pores.After the reaction,the bulk density and compressive strength of the adsorbent increased.
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