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
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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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