Photocatalytic hydrolysis fine desulfurization method for blast furnace gas

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, ...

AI Technical Summary

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.

Images