Comprehensive utilization method of industrial furnace gas

Abstract

The invention relates to a comprehensive utilization method of industrial furnace gas, which belongs to the field of metallurgy, in particularly to utilization of industrial furnace gas which mainly comprises CO2. The invention achieves the purposes of providing the comprehensive utilization method of the industrial furnace gas and enhancing utilization value of components and heat in the furnace gas. The method comprises the steps of: A, preheating and removing impurities of the industrial furnace gas; B, decomposing CO2 in the industrial furnace gas treated in step A into CO by using a catalyst at the temperature of not more than 1450 DEG C; and C, usually only using waste heat resources in the reutilization of the industrial furnace gas of CO obtained in step B. In the method, CO2 is effectively used without waste; a catalytic technology is adopted for converting CO2 into CO; the waste heat of the furnace gas is thoroughly used for providing a heat source for a catalytic reaction; when CO2 is catalyzed and converted into CO gas, heat loss is less; therefore, the waste heat resources and CO can be used for largely reducing the utilization of the heat source and a carbon source for realizing the comprehensive utilization of the furnace gas.

Description

technical field [0001] The invention belongs to the field of metallurgy and relates to a method for comprehensive utilization of industrial furnace gas, in particular to a method mainly containing CO 2 The utilization of industrial furnace gas. Background technique [0002] For mainly containing CO 2 The current treatment method of industrial furnace gas is generally to remove the dust impurities or SO 2 、H 2 After removing environmentally unfriendly impurities such as S, they are directly discharged into the atmosphere; or the remaining heat is utilized. [0003] Such as: metal oxide reduction process, that is, the process in which metal oxides (such as copper, iron, chromium, titanium and other oxides) react with reducing agents to obtain metals. When carbonaceous reducing agents are used in the reduction process, the high temperature generated after reduction The main components of furnace gas are CO, CO 2 and solid impurities. The treatment method for this kind of ...

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Problems solved by technology

The above treatment process: waste heat power generation, drying or preheating process raw materials can use the heat in the furnace gas, but will cause a large amount of CO 2 At the same time, because the CO in the furnace gas is not effectively utilized, the production of CO in the main process reduction gas will be increased, thereby increasing the carbon consumption

The way of pressure swing adsorption after cooling is adopted. Although CO can be recycled, CO is removed due to the cooling step and pressure swing adsorption. 2 Both steps require a large amount of equipment investment and operating costs. When the separated CO is used as a reductant for recirculation, the storage link is increased, and energy consumption is required to be heated to the process temperature required for reduction, which increases the operating energy consumption. Therefore, the method The economic cost is relatively high

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