Fine desulfurization device and fine desulfurization method for blast furnace gas

Abstract

The invention relates to the technical field of flue gas desulfurization, and provides a blast furnace gas fine desulfurization device and a fine desulfurization method, a front-end treatment technology is adopted, i.e., desulfurization is carried out before blast furnace gas is sent out of a system, according to the characteristic that the COS content of the blast furnace gas is high, desulfurization can be realized by adopting a COS hydrolysis process, and because the blast furnace gas contains trace toxicants such as HCl, HF and HCN, the content of the toxicants in the blast furnace gas is low, and the content of the toxicants in the blast furnace gas is low. Therefore, a liquid-phase detoxification catalyst and a hydrolysis protective agent which are specially used for removing toxicants in the blast furnace gas are adopted, most toxicants in the blast furnace gas can be removed, the desulfurization efficiency and stability of the system are improved, and the device comprises a bag-type dust collector and a heat recovery system for recovering the blast furnace gas, the heat recovery system is communicated with the bag-type dust collector through a three-way front pipe, the three-way front pipe is communicated with a liquid-phase detoxification catalyst supplementing device, a delivery pump is arranged between the liquid-phase detoxification catalyst supplementing device and the three-way front pipe, and a liquid-phase detoxification catalyst is arranged in the liquid-phase detoxification catalyst supplementing device.

Description

technical field [0001] The invention relates to the technical field of flue gas desulfurization, in particular to a blast furnace gas fine desulfurization device and a fine desulfurization method. Background technique [0002] As we all know, blast furnace gas is a kind of combustible gas produced by blast furnace smelting process. Dust, blast furnace gas is not only used as fuel for hot blast stove in its own system, but also a large amount of rich blast furnace gas that needs to be discharged. The discharged blast furnace gas is usually used for coke oven, heating furnace, soaking furnace, rolling steel heating furnace fuel and boiler. For steam power generation, etc., whether it is the external use of blast furnace gas or the final discharge, it is necessary to absorb sulfur and other harmful substances in the blast furnace gas to reduce the corrosion of subsequent equipment and reduce the environmental pollution during the discharge process. , In order to realize the de...

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Problems solved by technology

[0003] After retrieval, such as the Chinese invention patent published on August 28, 2020, with the publication number CN111592917A, which discloses a blast furnace gas fine desulfurization method and a fine desulfurization system, which is roughly described as follows: the blast furnace gas is sequentially passed through After gravity dust removal and bag dust removal, it enters the organic sulfur conversion device. The organic sulfur in the blast furnace gas is hydrolyzed and converted into H2S. The blast furnace gas is discharged from the organic sulfur conversion device and then enters the residual pressure power generation device. The final blast furnace gas is passed into the desulfurization device, and is contacted with the mixed desulfurization liquid formed by desulfurizing agent and lye for fine desulfurization. The present invention designs a method for fine desulfurization of blast furnace gas, which can remove COS and H2S in the gas at the same time. Synergistically remove HCl and utilize continuous melting sulfur process to realize resource utilization of sulfur in blast furnace gas, reduce the impact of fine desulfurization process at the same time, and ensure the quality of blast furnace gas. However, at present, the desulfurization of blast furnace gas including the above-mentioned schemes adopts the terminal treatment technology to remove SO2 in the flue gas, but the terminal treatment has the disadvantages of scattered user sites, repeated investment, high operating costs and difficult treatment.

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