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The oxygen-enriched top-blown smelting reduction furnace Numerical Simulation and Experimental Study

Author: YueZhengChao
Tutor: QingShan；WangHua
School: Kunming University of Science and Technology
Course: Engineering Thermophysics
Keywords: Smelting reduction furnace Numerical Simulation Bath Flow Fuel combustion Temperature distribution
CLC: TF557
Type: Master's thesis
Year: 2010
Downloads: 74
Quote: 0
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Abstract


With the development of socio-economic resources of the global steel industry is facing a shortage of growing environmental load pressure, insightful people more and more attention, and therefore meet the contemporary trend of the development of a new iron-making technology to replace the traditional The blast furnace ironmaking technology is imminent. New ironmaking process is characterized by direct use of untreated pulverized coal and iron ore as raw materials, direct reduction of iron ore for the solid iron or iron ore reduction reaction in high temperature slag phase. New ironmaking process can be omitted sintering of iron ore and coal coke for blast furnace ironmaking process procedures, not only can reduce the pollution generated in the iron-making process, and improve the economic efficiency of ironmaking. After decades of development, smelting reduction ironmaking technology with its environmental, process simple, high energy efficiency, high melting efficiency, and flexible process operation advantages gradually come to the fore. The research of this subject that is generated in this background. In this paper, computational fluid dynamics (CFD) FLUENT package, numerical simulation study HIsmelt melt reduction furnace, and Laboratory designed and built by the oxygen-enriched top-blown smelting reduction furnace, the molten pool flow model and furnace fuel combustion model were established, which HIsmelt melt reduction furnace gas combustion model of oxygen-rich top blown smelting reduction furnace fuel combustion model, respectively furnace combustion temperature field distribution and influencing factors on the flow behavior of the pool, a numerical simulation study. The GAMBIT software first before using CFD processing, according to the geometric model of the actual furnace structure and subregional unstructured grids and structured grid combined with the mixed grid mesh, to ensure the quality of the grid. FLUENT numerical simulation model, the choice of a suitable fluid flow and combustion heat and mass transfer to calculate mathematical model, based on the fuel flow by theoretical calculations, the theoretical amount of air required for complete combustion and different excess air ratio when the the corresponding inlet air speed, as the initial parameters are substituted into the model were numerically simulated. The HIsmelt melt reduction furnace model and oxygen-enriched top-blown melt reduction furnace model study focused on the flow behavior of the molten pool and furnace fuel combustion temperature field distribution. Mainly reached the following conclusions: HIsmelt smelting reduction furnace side gun blowing action \The pool area temperature of about 40 ° C; enriched top blowing melt reduction furnace in gun position when only the top lance blowing 600mm formation of \furnace gas combustion in the combustion process, with the increase of excess air ratio, the average temperature of furnace significantly increased, but when the excess air ratio over 1.4, the temperature is on a downward trend; oxygen-enriched top-blown smelting reduction furnace hearth is fuel combustion, the combustion process, the more substantial increase in the average temperature of furnace, when the excess air ratio exceeds 1.2, the temperature on a downward trend; HIsmelt smelting reduction furnace combustion process, with the increase of oxygen enrichment, the average temperature of the furnace significantly increased; oxygen-rich top-blown smelting reduction furnace combustion process, with increasing oxygen enrichment, a significant increase in the average temperature of furnace. In addition, the oxygen-rich top blown smelting reduction furnace fuel combustion process, the selection of spray atomization furnace fuel combustion temperature field distribution have a greater impact. Based on the principle of combining theory, simulation and testing, while numerical simulation study of the oxygen-rich top blowing molten high-phosphorus iron ore reduction furnace smelting industrial test, during the test, get the thermocouple to monitor temperature and flue gas component analysis parameters, the data is consistent with both blown smelting reduction furnace numerical simulation results contrast with the oxygen-rich top.

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CLC: > Industrial Technology > Metallurgical Industry > Ironmaking > Iron ore directly restore > Smelting reduction method
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