Coal-based direct reduction iron rotary hearth furnace and combustion method thereof

A combustion method and rotary hearth furnace technology, applied in the field of kilns, can solve problems such as high exhaust gas temperature, environmental pollution, energy waste, etc., and achieve the effect of increasing combustion temperature and high combustion temperature

Active Publication Date: 2009-04-22
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Abstract
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Problems solved by technology

[0006] The above-mentioned prior art has at least the following disadvantages: high fuel calorific value requirements, high exhaust gas temperature, energy waste, and environmental pollution

Method used

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  • Coal-based direct reduction iron rotary hearth furnace and combustion method thereof
  • Coal-based direct reduction iron rotary hearth furnace and combustion method thereof

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Embodiment Construction

[0014] Coal-based direct reduced iron rotary hearth furnace of the present invention, its preferred embodiment is as follows figure 1 As shown, it includes an annular inner wall 2 and an outer wall 3, a furnace bottom 6 is provided between the inner wall 2 and the outer wall 3, the furnace bottom 6 can rotate, and a plurality of regenerative burners 1 are respectively arranged on the inner wall 2 and the outer wall 3. In the rotary hearth furnace, along the direction of rotation of the furnace bottom 6, there are sequentially arranged a material distribution area, a preheating reduction section, a heating reduction section, a high temperature reduction section, a control reduction section and a discharge area. Port 5 and outlet 4.

[0015] Multiple burners 1 can be arranged in pairs on the furnace wall. In each pair of burners 1 , one is arranged on the inner wall 2 , and the other is arranged on the outer wall 3 , or both burners 1 are arranged on the outer wall 3 .

[0016...

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Abstract

The invention discloses a coal-based direct reduction iron rotary hearth furnace and a combustion method thereof. The furnace comprises a ring-shaped inner wall and a ring-shaped outer wall, a rotary hearth is arranged between the inner wall and the outer wall, and the inner wall and the outer wall are provided with a plurality of regenerative burners. When the furnace is fired, part of the regenerative burners are fired, and of the left burners are used to discharge smoke; when the preset combustion time is up, the firing burners stop firing and start to discharge smoke, the unfired burners start firing, and the rotation is performed periodically. When the burners discharge smoke, a regenerator absorbs heat so as to lower the temperature of discharged smoke; when the burners are fired, the regenerator releases heat so as to preheat oxidizing air or fuel and increase the combustion temperature. All fuels, of which the thermal values are between 750 and 9000kcal / Nm<3>, can be used, the furnace temperature and furnace inside atmospheres can meet the process requirements for direct reduction iron.

Description

technical field [0001] The invention relates to a kiln technology, in particular to a coal-based direct reduced iron rotary hearth furnace and a combustion method thereof. Background technique [0002] The traditional ironmaking process is to roast iron ore into sinter or oxidized pellets, smelt coking coal into coke, put the iron ore and coke into a blast furnace after burning, and obtain molten iron through reduction reaction. Although this process is very mature and widely used, it requires large investment in equipment, complex process, high energy consumption, and high emission of pollutants, and the coking coal suitable for coking is becoming more and more exhausted. [0003] Direct reduced iron (sponge iron) can replace scrap steel as the raw material for electric furnace steelmaking produced by the new steel short process process. Nowadays, scrap steel resources are in short supply and the price is getting more and more expensive. Therefore, the production of direct ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/08
Inventor 吴道洪谢善清王东方阮立明
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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