System for removing corrosive substances in coal gas obtained by dry dedusting of blast furnace and process thereof

Abstract

The invention discloses a system for removing corrosive substances in coal gas obtained by dry dedusting of a blast furnace and a process thereof, which belong to the technical field of blast-furnace dedusting. The system comprises a NaOH alkaline solution preparation and spraying system, a softened water assisted alkaline solution spraying system, a circulating water system, a reuse water supplementing and spraying system, a cleaning tower and a cleaning tower packing layer. An outlet pipe of an alkaline solution metering pump in the NaOH alkaline solution preparation and spraying system is connected with an outlet pipe of a softening water pump in the softened water assisted alkaline solution spraying system, pressurized alkaline solution is pumped into pressurized softened water, and the mixture is conveyed into the cleaning tower through a pipeline and is sprayed into the cleaning tower on a common nozzle of the alkaline solution and the softened water. The system and the process have the advantages that the system and the process can successfully remove an acid substance NH4CL with extremely strong corrosiveness in the coal gas, improve the PH value of condensed water of the coal gas, reduce the salt content and electrical conductivity of the condensed water of the coal gas, greatly delay the corrosion rate of coal gas transmission pipeline networks and coal gas user facilities, and guarantee the safe operation of steel production.

Description

technical field [0001] The invention belongs to the technical field of blast furnace dedusting, and in particular provides a system and process for removing corrosive substances in ironmaking blast furnace dry dust removal gas, which is used for removing acidic corrosive substances contained in ironmaking blast furnace dry dust removal gas . Background technique [0002] With the increasingly intensified competition in the world's iron and steel metallurgy industry, blast furnace gas dry dust removal, an energy-saving and consumption-reducing process technology, has received unprecedented attention in the industry. Major iron and steel companies at home and abroad have generally begun to promote and apply it. One of the energy-saving and consumption-reducing technologies advocated and popularized is bringing huge economic benefits to enterprises. However, there are advantages and disadvantages. Compared with wet dust removal, the dry dust removal technology currently implem...

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Problems solved by technology

However, there are advantages and disadvantages. Compared with wet dust removal, the dry dust removal technology currently implemented at home and abroad can save precious water resources and greatly increase the power generation load, but it cannot successfully remove the acidity in gas like wet dust removal. Corrosive substances, the corrosive substances entrained in the gas will bring rapid and serious damage to the pipeline network and user facilit

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