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Blast furnace iron manufacturing process

A blast furnace ironmaking and blast furnace technology, applied in blast furnaces, blast furnace details, furnaces, etc., can solve problems such as low thermal efficiency, reduce coke ratio and energy consumption, save coke consumption, and benefit environmental protection

Active Publication Date: 2009-06-24
BEIJING PEKING UNIV PIONEER TECH
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Problems solved by technology

[0007] If the volume fraction of CO in the blast furnace gas can be increased to more than 60% (that is, the calorific value reaches 7536kJ / m 3 Above), it can be directly used as fuel without coke oven gas or fuel oil; but using blast furnace gas as combustion gas, the thermal efficiency of combustion is low; if CO can be enriched in blast furnace gas and returned to the blast furnace Used as reducing gas, it can greatly reduce the amount of coke used in the ironmaking process, further reduce the energy consumption of the ironmaking process, and reduce the emission of blast furnace gas

Method used

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Embodiment 1

[0039] see figure 1 , using the two-bed flow pressure swing adsorption process combined with the blast furnace ironmaking process to compare with the conventional ironmaking process.

[0040] The adsorbent used in the adsorption bed of the two-bed process pressure swing adsorption process is a molecular sieve loaded with copper compounds. The adsorption process includes the following cycle steps: adsorption, pressure equalization, forward discharge, displacement flushing, reverse discharge, vacuuming, pressure charging, Final pressure, wherein the pressure of the adsorption step is 0.3Mpa; the pressure of the replacement step is 0.01Mpa; the pressure of the vacuum step is -0.06Mpa.

[0041] The blast furnace gas on the top of the furnace is cooled to room temperature with a heat exchanger, and carbon monoxide gas with a purity of 70% is enriched through the pressure swing adsorption process, and is directly blown in from the shaft of the blast furnace. The other ironmaking pro...

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Abstract

The invention relates to a method for ironmaking by a novel blast furnace. A pressure-swing absorption apparatus and a blast furnace ironmaking device are combined and applied. Carbon monoxide is enriched from blast furnace coal gas by the pressure-swing absorption apparatus after cooling and removing dust, and the enriched carbon monoxide returns to the blast furnace from different parts of the blast furnace. The invention not only lowers coke consumption during the ironmaking process and reduces the coke rate and the energy consumption for ironmaking by the blast furnace, but also solves the problem that utilization rate of the blast furnace coal gas is low. The invention reduces the emission of harmful gas, such as the carbon monoxide, carbon dioxide and the like and is good for the environmental protection. Under proper condition, the coke rate can be reduced from 420kg / t to 180kg / t by the method to the maximum.

Description

technical field [0001] The invention relates to a blast furnace ironmaking method, in particular to a blast furnace ironmaking method combining pressure swing adsorption and blast furnace ironmaking. Background technique [0002] The basic industry of my country's iron and steel industry is blast furnace ironmaking. Almost all steel raw materials are produced by blast furnace ironmaking. Therefore, one of the by-products of blast furnace ironmaking: blast furnace gas has a huge discharge. Because the content of combustible components in blast furnace gas is not high enough, it is difficult to recycle. A large amount of blast furnace gas is directly discharged into the air in the domestic iron and steel industry. If the country produces 100 million tons of pig iron a year, the volume fraction is 10%. , the volume fraction of CO in the blast furnace gas is calculated as 25%, and the CO discharged into the air is 450 million m 3 . It can be seen that the direct discharge of b...

Claims

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Application Information

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IPC IPC(8): C21B5/00C21B5/06
Inventor 耿云峰田伟张佳平吕昌忠唐伟谢有畅
Owner BEIJING PEKING UNIV PIONEER TECH
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