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System and method for fluidized bed gas production, gas-based reduction and electric steelmaking coupling

An electric furnace steelmaking and fluidized bed technology, applied in electric furnaces, furnaces, shaft furnaces, etc., can solve the problems of large energy consumption, large equipment investment, long process flow, etc., to reduce energy consumption, reduce production costs, reduce system The effect of investment

Pending Publication Date: 2017-10-27
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the cooling and heating of high-temperature gas, desulfurization and decarbonization transformation, and the pressurized turbine decompression process are long, the equipment investment is large, the energy consumption is large, and energy waste is also caused.

Method used

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  • System and method for fluidized bed gas production, gas-based reduction and electric steelmaking coupling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] Dry the crushed and screened coal and lime with a particle size of 2-8mm in the drying furnace. The heat source of coal drying is: gas-based direct reduction shaft furnace top gas flue gas, and the shaft furnace top gas temperature is 450°C. Moisture pulverized coal is transported to the fluidized bed silo for use, and the coal is added through the screw feeder.

[0095] First, the raw coal and desulfurizer are fed into the fluidized bed from the feeder from the silo, and the mass ratio of coal to desulfurizer is 100:1.5. All water vapor is introduced from the bottom of the bed. In order to better couple with the direct reduction process of the shaft furnace, the molar ratio of carbon to water vapor in the pulverized coal during the production process is 1.15:1. The pressure in the bed is controlled at 0.25MPa, and the bed temperature is 850°C. The contents of carbon dioxide and water vapor in the gas at the outlet of the fluidized bed were 6.52% and 5.39%, respectivel...

Embodiment 2

[0113] The semi-coke and calcium carbonate with a particle size of 2-8 mm after crushing and screening are transported to the fluidized bed silo for use, and the coal is added through a screw feeder.

[0114] First, the raw coal and desulfurizer are fed into the fluidized bed from the feeder from the silo, and the mass ratio of coal to desulfurizer is 100:1. All the pure oxygen is fed from the bottom of the bed. In order to better couple with the direct reduction process of the shaft furnace, the molar ratio of carbon to pure oxygen in the pulverized coal during the production process is 1.1:1. The pressure in the bed is controlled at 0.4MPa, and the bed temperature is 750°C. The contents of carbon dioxide and water vapor in the gas at the outlet of the fluidized bed are 6.01% and 5.33%, respectively. The main principle of fluidized bed coal gasification:

[0115] C+H 2 O=CO+H 2 , C+O 2 =CO 2 , C+CO 2 =2CO, and methane and CnHm gas obtained by decomposition of volatile ...

Embodiment 3

[0134] Dry the coal and dolomite with a particle size of 2-8mm after crushing and screening. The dehydrated coal powder is transported to the fluidized bed silo for use, and the coal is added through the screw feeder.

[0135] First, the raw coal and desulfurizer are fed into the fluidized bed from the feeder from the silo, and the mass ratio of coal to desulfurizer is 100:1.5. The mixture of water vapor and pure oxygen is completely fed from the bottom of the bed. In order to better couple with the direct reduction process of the shaft furnace, the molar ratio of carbon in the pulverized coal to the mixture of water vapor and pure oxygen in the production process is 1.15:1. The pressure in the bed is controlled at 0.8MPa, and the bed temperature is 750°C. The contents of carbon dioxide and water vapor in the gas at the outlet of the fluidized bed are 6.25% and 5.12%, respectively. The main principle of fluidized bed coal gasification:

[0136] C+H 2 O=CO+H 2 , C+O 2 =CO...

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Abstract

The invention relates to a system and a method for fluidized bed gas production, gas-based reduction and electric steelmaking coupling. The system comprises a fluidized bed, a gas-based reduction device and an electric furnace, wherein the fluidized bed comprises an air distribution plate, a gas blowing hole, a fluidized bed material cabin and a coal gas outlet; the gas-based reduction device comprises a vertical furnace and a iron tank which are connected with each other; the vertical furnace comprises a coal gas inlet and an oxidized block cabin; the coal gas inlet is connected with the coal gas outlet; the iron tank comprises a reduced iron outlet; the electric furnace comprises a reduced iron inlet, an electric furnace cabin and a steel outlet; and the electric furnace reduced iron inlet is connected with the reduced iron outlet of the iron tank. Through coupling processes of fluidized bed gas production-direct gas-based reduction-electric steelmaking coupling, the process of cooling, washing, dust collection and further heating of a coal gas produced by using the fluidized bed is avoided, system investment is reduced, sensible heat of the coal gas is sufficiently utilized, energy consumption of coal gas heating of the vertical furnace is reduced, relatively optimal parameters are screened, the complete-flow optimal process is explored, and optimal coupling of production parameters of equipment is achieved.

Description

technical field [0001] The invention relates to the technical field of chemical metallurgy, in particular to a system and method for fluidized bed gas production-gas-based direct reduction-electric furnace steelmaking. Background technique [0002] Compared with the traditional blast furnace process, the gas-based shaft furnace direct reduction-electric furnace process has the advantages of relatively short process, no coking coal, large output of a single set of equipment, energy saving, and CO emission reduction. 2 Technical advantages such as obvious effects can help the iron and steel industry get rid of the shackles of coking coal resources, reduce energy consumption and reduce CO 2 Emission reduction is the mainstream technology of coke-free ironmaking technology. Because the gas-based direct reduction method can improve the structure of iron and steel products, it has become a low-carbon green advanced ironmaking technology to improve the quality of iron and steel pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/02C21C5/52C10J3/54
CPCC10J3/54C21B13/02C21C5/52Y02P10/20
Inventor 邓君曹志成冯鲁兴范志辉韩志彪唐敬坤吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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