高炉煤气全干式精脱硫工艺路线探讨

doi:10.13228/j.boyuan.issn0449-749x.20210686

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Abstract Regarding the characteristics of sulfide in blast furnace gas, big gas output and numerous scattered downstream users, the present situation of gas fine desulfurization were studied. By controlling from source, the fine desulfurization technology route of “pretreatment +catalytic hydrolysis + dry desulphurization” was proposed. According to the actual working conditions, the pretreatment and hydrolysis system could be placed before or after the top gas pressure recovery turbine unit. The route was adopting full-dry processing unit, which could ensure the calorific value, reduce the pressure of end of pipe control and achieve ultra-low emissions. The pretreating section could effectively avoid the influence of acidic gases such as hydrogen chloride on the back-end process. Taking the form of setting the process route after the top gas pressure recovery turbine for example, the integrated experimental system was set up to study the influence of various factors on system efficiency, including setting of pretreatment system, temperature, water content, oxygen content, etc. The experimental results showed that the pretreatment system could effectively remove acidic gases, such as hydrogen chloride, prolong the service life of hydrolytic agent and avoid corrosion of back-end pipes and equipment. Setting fine desulfurization system after TRT, there existed a better temperature range 70-90 ℃, and an optimal reaction temperature 80 ℃, resulting in a stable total sulfur removal rate over 95%, when reaction temperature varied from 40-120 ℃. The experimental results also indicated that the hydrolysis efficiency could achieve higher than 96%, when the volume ratio of H₂O/COS was 6. It was not conductive to the hydrolysis when the ratio was too high or too low. When the molar ratio of O₂/H₂S was greater than 3, the desulfurization and regeneration could take place simultaneously, and no extra operation was required. The experiments prove that the route of “pretreatment +catalytic hydrolysis + dry desulphurization” which can meet the requirements of different working conditions and effectively reduce the sulfur content is a simple and efficient new process for fine desulfurization of blast furnace gas.

Key words： blast furnace gas fine desulfurization fully-dry catalytic hydrolysis dechlorination

Received: 11 November 2021

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	SUN Man-li
	ZHANG Min
	WANG Jian
	HAN Wen-tao
	CHEN Fan

Cite this article:

SUN Man-li,ZHANG Min,WANG Jian等. Discussion on process route for full-dry fine desulfurization of blast furnace gas[J]. Iron and Steel, 2022, 57(4): 148-157.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20210686 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I4/148

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