Photocatalytic hydrolysis fine desulfurization method for blast furnace gas

A technology of blast furnace gas and photocatalysis, which is applied in the purification of combustible gas, removal of gas pollutants, purification/reconstruction of combustible gas, etc., can solve the problems of high investment cost, unfavorable industrial application, and reduce catalyst activity, and achieves low investment. , prolong the service life, avoid the effect of influence

Inactive Publication Date: 2021-04-06
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention is aimed at the fact that the existing blast furnace gas desulfurization process requires multi-stage hydrolysis devices in the stage of catalytic hydrolysis of organic sulfur, and the investment cost is high, which is not conducive to industrial application. Sulfurization phenomenon, reducing catalyst activity and other problems, provides a method of blast furnace gas photocatalytic hydrolysis fine desulfurization, the method uses catalytic hydrolysis combined with photocatalysis, on the basis of organic sulfur hydrolysis, fully utilizes the oxygen in the raw material gas, in Under the condition of ultraviolet light, strong oxidizing substances such as hydroxyl radicals are generated through photoreaction, and organic sulfur is oxidized, thereby effectively avoiding the poisoning phenomenon of the hydrolysis catalyst caused by oxygen. In the process, the integration of catalytic hydrolysis and photocatalysis of COS is realized, and the organic sulfur is completely converted into inorganic sulfur; after entering the follow-up device, the inorganic sulfur is removed through the existing relatively mature desulfurization process, and the zero-sulfur utilization of blast furnace gas is realized.

Method used

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  • Photocatalytic hydrolysis fine desulfurization method for blast furnace gas

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Experimental program
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Effect test

Embodiment 1

[0030] 1. BiWO 6 -TiO 2 The preparation of the modified photocatalyst is as follows:

[0031] Mix 20mL of absolute ethanol and 6mL of tetra-n-butyl phthalate, stir at 30°C for 30min, then add 1mL of acetylacetone and 0.75mL of nitric acid, keep stirring for 30min, adjust the pH to 7 with ammonia water, at a rate of 20°C / h Raise the temperature to 70°C to gel state to obtain sol-like TiO 2 ; Add sol-like TiO to the bismuth tungstate solution with a mass concentration of 5% 2 , stirred evenly, transferred to an autoclave, reacted at 200°C for 15h, centrifuged and filtered, washed with 25% ethanol solution for 3 times, dried at 60°C for 12h, and then calcined at 350°C for 4h to obtain BiWO 6 -TiO 2 Modified photocatalyst;

[0032] 2. If figure 1 As shown, the blast furnace gas after dedusting is cooled to 70-80°C, and the COS concentration in the gas is 140mg / m 3 , Dust concentration 0.2mg / m 3 , at an airspeed of 500h -1 access with BiWO 6 -TiO 2 In the first-stage pho...

Embodiment 2

[0034] Cool the blast furnace gas after dedusting to 80-90°C, and the COS concentration in the gas is 150mg / m 3 , Dust concentration 0.2mg / m 3 , at an airspeed of 600h -1 Pass through with Cu-KOH / γ-Al 2 o 3 In the first-stage photocatalytic hydrolysis desulfurization device of the modified photocatalyst, water vapor is introduced at the same time, and the volume percentage of water vapor in the gas is 5.5%. Under the condition of simultaneous presence of catalyst, photocatalytic oxidation and hydrolysis of organic sulfur in blast furnace gas are carried out, the reaction temperature is 90°C, and the concentration of COS in the gas after reaction is lower than 0.1mg / m 3 , the concentration of hydrogen sulfide is 149mg / m 3 ; then sent to the secondary inorganic sulfur removal device (dry desulfurization system), the dry desulfurization system is an adsorption desulfurization tower, built-in copper-doped activated carbon modified adsorbent (refer to "Liu Xiaokun, Liu Yongjun....

Embodiment 3

[0037] Cool the blast furnace gas after dedusting to 90-100°C, and the COS concentration in the gas is 160mg / m 3 , Dust concentration 0.3mg / m 3 , at an airspeed of 700h -1 into ZrO with Cu-Ce load 2 In the first-stage photocatalytic hydrolysis desulfurization device of the catalyst, water vapor is introduced at the same time. The volume percentage of water vapor in the gas is 5.7%. Photocatalytic oxidation and hydrolysis of organic sulfur in blast furnace gas under existing conditions, the reaction temperature is 100°C, and the concentration of COS in the gas after the reaction is lower than 0.1mg / m 3 , the concentration of hydrogen sulfide is 158mg / m 3 , dust concentration 16mg / m 3 ; and then sent to the secondary inorganic sulfur removal device (wet desulfurization system), the wet desulfurization system is a lye absorption tower, built-in NaOH lye, double tower desulfurization, the airflow enters from the lower part of the desulfurization tower, and the upper part of th...

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Abstract

The invention provides a method for fine desulfurization of blast furnace gas by photocatalytic hydrolysis, which comprises the following steps: cooling dedusted blast furnace gas to 50-150 DEG C, introducing the cooled blast furnace gas into a gas-solid photocatalytic reactor, and carrying out photocatalytic oxidation and hydrolysis reaction on organic sulfur in the blast furnace gas in the presence of water vapor, illumination and a catalyst at the same time, organic sulfur in the blast furnace gas is hydrolyzed and oxidized into inorganic sulfur, the reacted gas passes through an inorganic sulfur removal device to remove the inorganic sulfur, and the desulfurized blast furnace gas enters a gas pipe network to be used; organic sulfur and inorganic sulfur in blast furnace gas are subjected to source treatment by adopting a two-step method, so that the desulfurization effect is improved, and fine desulfurization is realized; the blast furnace gas is cleaned and utilized after being desulfurized, so that the concentration of SO2 after combustion can reach a pollutant emission limit value, the ecological environment pollution is reduced, and the resource utilization rate is improved.

Description

technical field [0001] The invention belongs to the technical field of gas treatment, and in particular relates to a method for fine desulfurization by photocatalytic hydrolysis of blast furnace gas. Background technique [0002] Blast furnace gas is a by-product gas in the steelmaking process, and there is about 1300-1600m3 for every ton of steel produced. 3 Blast furnace gas is produced; blast furnace gas contains many impurities, such as sulfides, oxygen, etc., among which sulfides are not only high in content, but also of various types; these sulfur-containing gases often have stench and toxicity, which are harmful to the ecological environment and human health. severe impact. Among them, more than 90% of the organic sulfur is COS. The existence of these gases will not only corrode the facilities in the process and poison the catalyst, but also cause the combustion product SO 2 excessive emissions. From the perspective of safe production and environmental protection, ...

Claims

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Application Information

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IPC IPC(8): C10K1/34C10K1/00
CPCC10K1/34C10K1/004
Inventor 王学谦周菲王郎郎蔡君
Owner KUNMING UNIV OF SCI & TECH
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