Rotary hearth furnace and rotary hearth furnace waste gases utilization method

A technology of rotary hearth furnace bottom and rotary hearth furnace, which is applied in the field of iron and steel smelting to achieve the effects of fast heat transfer of furnace charge, high production efficiency and efficient use of waste heat

Inactive Publication Date: 2009-07-08
PANGANG GROUP RESEARCH INSTITUTE CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, no technical measures have been taken for the traditional rotary hearth furnace, and the literature and reports of using the waste heat of the exhaust gas to preheat the charge and promote the reduction have appeared

Method used

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  • Rotary hearth furnace and rotary hearth furnace waste gases utilization method
  • Rotary hearth furnace and rotary hearth furnace waste gases utilization method

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Comparison scheme
Effect test

Embodiment 1

[0021] In the present invention, a waste gas utilization device is arranged on the furnace bottom of the rotary hearth furnace, and the waste gas utilization device is a ventilation brick 13 and an exhaust fan 14 arranged at the furnace bottom positions of the preheating section 10 and the reduction section 20 of the rotary hearth furnace 200; The furnace bottoms of the preheating section 10 and the reducing section 20 are laid with air-permeable bricks 13 , and a plurality of exhaust fans 14 are connected below the air-permeable bricks 13 .

[0022] Adopt the waste gas utilization method of the rotary hearth furnace of the present invention, at first send the carbon-containing pellet charge into the rotary hearth furnace of the present invention, directly make the material layer thickness reach 100mm, when the rotary hearth furnace is heated, use the exhaust fan 14 to The high-temperature waste gas generated in the heating section and the reduction section is extracted through...

Embodiment 2

[0024]On the basis of the improved rotary hearth furnace structure of embodiment 1, adopt the rotary hearth furnace exhaust gas utilization method of the present invention, at first send carbon-containing pellet charge in the rotary hearth furnace of the present invention, directly make material layer thickness reach 200mm, During the heating operation of the rotary hearth furnace, the exhaust fan 14 is used to extract the high-temperature exhaust gas generated in the preheating section and the reduction section through the ventilating brick 13, and the high-temperature exhaust gas is generated in the furnace charge in the preheating section and the reduction section for convective heat transfer; The exhaust gas extraction process is to perform forced preheating, heat transfer and heating on the carbon-containing pellets in the preheating section and reduction section of the rotary hearth furnace, and promote the reduction of the carbon-containing pellets. The metallization rat...

Embodiment 3

[0026] On the basis of the improved rotary hearth furnace structure of embodiment 1, adopt the rotary hearth furnace exhaust gas utilization method of the present invention, at first send carbon-containing pellet charge in the rotary hearth furnace of the present invention, directly make material layer thickness reach 300mm, During the heating operation of the rotary hearth furnace, the exhaust fan 14 is used to extract the high-temperature exhaust gas generated in the preheating section and the reduction section through the ventilating brick 13, and the high-temperature exhaust gas is generated in the furnace charge in the preheating section and the reduction section for convective heat transfer; The exhaust gas extraction process is to perform forced preheating, heat transfer and heating on the carbon-containing pellets in the preheating section and reduction section of the rotary hearth furnace, and promote the reduction of the carbon-containing pellets. The metallization ra...

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Abstract

The invention discloses a rotary hearth furnace and a waste gas utilization method thereof. The invention is characterized in that, a waste gas utilization apparatus is arranged at the bottom of the rotary hearth furnace, namely, an air extractor and gas permeable bricks are arranged at the bottom of the rotary hearth furnace; when the rotary hearth furnace is working, hot waste gas generated by the rotary hearth furnace is extracted by the air extractor, therefore convection heat transferring by hot waste gas is formed in the materials in the rotary hearth furnace, a forced pre-heating of the materials is performed and heat quantity is provided for material reduction, therefore, the reduction of the materials at the reduction segment can be promoted, and the thickness of material layer is up to 100mm-300mm.By adopting the rotary hearth furnace and the waste gas utilization method of the invention, exhaust heat of the waste gas generated by a rotary hearth furnace can be utilized efficiently, heat transmission speed of the materials is fast and the material layer is thick, therefore, a stable continuous production with a high production efficiency can be realized.

Description

technical field [0001] The invention relates to the field of iron and steel smelting. In particular, the present invention relates to a rotary hearth furnace and a method for improving the reduction efficiency of carbonaceous pellets by using the waste gas produced by the rotary hearth furnace. Background technique [0002] Nowadays, there are many kinds of coal-based direct reduction processes. Among them, the rotary hearth furnace reduction process has attracted extensive attention because of its advantages such as simple equipment, easy operation, short production cycle, fast reaction speed, and environmental friendliness. focus on. The direct reduction iron (DRI) process using rotary hearth furnace equipment mainly includes the following steps: uniformly mix iron ore powder and reducing agent coal powder, press into carbon-containing pellets, and dry; spread the dried carbon-containing pellets evenly on On the rotary hearth furnace, the carbon-containing pellets are re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/08
Inventor 邓君文永才刘功国李占军薛逊汤天宇何群
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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