The air emissions are also lower than the conventional BF units. The commissioning was in Posted by Satyendra on Feb 22, in Technical 0 comments.
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The modified Rist operating diagram for the shaft furnace SF provided a nearly ideal value for the restriction point W when the metallization rate was increased, while the point P on the operating line for the melter gasifier MG moved upward due to reduction in the heat required in hearth.
It is an industrially and commercially proven direct smelting reduction process which allows for cost-efficient and environmentally compatible production of hot metal directly from iron ore and non-coking coal. The schematic process flow sheet ccorex shown in Fig 1 and the schematic view of main Corex plant sections is shown in Fig 2.
Corex Process for Production of Iron
Hot metal and slag are tapped as in conventional blast furnace practice. Therefore, mass and heat balance equations for the COREX process were established using the basic principles included proxess the Rist operating diagram for blast furnace BF as a reference.
Out of the above mentioned reactions, reactions for the reduction of iron oxide by hydrogen and calcination are endothermic, while the reactions for the reduction of iron oxide by CO gas and carbon deposition are exothermic in nature. Recommended articles Citing articles 0. This calls for high heat transfer efficiency. Meanwhile, in a two-stage process, like Corex, the ore is reduced in one shaft and melted and purified in another.
The plant rated capacity wasmetric tons per year.
Corex Process for Production of Iron | modellingadvice.info
The volatile matter is driven off and shattered fixed carbon particles fall into the gasification zone where oxygen is injected through blast furnace type tuyeres to burn the carbon to carbon monoxide CO. Corex process was developed by the Austrian technology supplier VOEST in the late s, and its feasibility was confirmed during the s. The general applicability of this first generation process was limited and a lot of technical problems had to be solved. The challenge Economical iron making basis for a new steelworks in an isolated area with limited access to fuel gas.
Corex process distinguishes itself from the blast furnace route by i direct use of non-coking coal as reducing agent and energy source, ii Iron ore can be directly and feasibly charged to the process in form of lump ore, and pellets, and iii use of pure oxygen instead of nitrogen rich hot blast.
Presently, the majority of steel production is through the blast furnace which has to rely on ever decreasing amounts of coking coal. Emission values are already far below the maximum values allowed by future standards. Furthermore, waste-water emissions from the Corex process are far lower than those in the conventional blast-furnace route. Due to this increased gas utilization which is based on gas recycling, gas production in the melter gasifier can be significantly lowered, which is directly reflected in lower fuel proccess oxygen consumption.
The air emissions are also lower than the conventional BF units. Because of many peripheral requirements, the total xorex of a Corex project can be relatively high. In a Corex process, the blast furnace concept is used but the blast furnace is virtually split into two halves at the cohesive zone interface Fig 3. The gasified coal is then fed into a shaft furnace to remove oxygen from iron ore lumps, pellets or sinter and finally, this direct reduced iron DRI is fed to forex smelting reactor.
A recycling system consisting of a compressor station and CO2 removal makes it possible to utilize more export gas for metallurgical work.
Corex Process - Wikipedia
The process gasifies non-coking coal in a smelting reactor, which also produces liquid iron. Due to its high calorific value, this gas can be recycled for reduction work or used for heat or energy generation. This being a two stage process, i. The feasibility of reducing the energy consumption during the COREX process by changing the fuel structure was also demonstrated.
The first stage of the process takes place in the reduction shaft, where iron ore burden is reduced by gases emanating from the melter-gasifier and is converted to hot DRI.
Corex process is one of these initiatives. Leave a Reply Cancel reply Your email address will not be published.
Articles created via the Article Wizard. The materials descend in the reduction shaft by gravity. Keywords modified Rist operating diagram. Retrieved November 3,