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Device for reducing dioxins discharge during steel smelting in electric furnace and method thereof

An electric furnace steelmaking and dioxin technology, which is applied in the field of iron and steel smelting to achieve the effect of reducing steelmaking costs and saving energy

Inactive Publication Date: 2008-10-01
JIANGSU SHAGANG GROUP HUAIGANG SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, how to control the emission of dioxins in the process of electric furnace steelmaking has not yet been reported

Method used

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  • Device for reducing dioxins discharge during steel smelting in electric furnace and method thereof
  • Device for reducing dioxins discharge during steel smelting in electric furnace and method thereof

Examples

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Embodiment Construction

[0019] Such as figure 1 As shown, the device for reducing dioxin emissions from electric furnace steelmaking includes a bag filter 17 and a negative pressure device 10 connected to the electric furnace 15 through the flue gas pipeline, and the pipeline between the electric furnace 15 and the bag filter 17 is sequentially It is connected with a combustion settling chamber 1 and a cooling device 2 .

[0020] still as figure 1 As shown, the combustion settling chamber 1 is a cuboid, and the inlet and outlet of the flue gas ducts 3, 3' are respectively arranged on the upper parts of the two ends of the combustion settling chamber 1 in the direction of the long axis, and the upper part of the combustion settling chamber 1 is also provided with an air inlet duct 4. The outer walls of the combustion settling chamber 1 and the flue gas pipes 3, 3' are provided with an insulating layer (not shown).

[0021] Such as figure 2 As shown, the cooling device 2 is composed of a housing 5 ...

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Abstract

The invention discloses a device and a method used for reducing the exhaust of electric furnace steelmaking dioxin, comprising a bag-typed deduster which is communicated with the electric furnace by a flue gas pipeline and a loading device. The invention is characterized in that the pipeline between the electric furnace and the bag-typed deduster is sequentially communicated with a combustion settlement chamber and a temperature reduction device. The method comprises the steps as follows: the electric furnace adopts the molten iron hot charging technique; the steelmaking flue gas enters the combustion settlement chamber for sufficient combustion, then enters the temperature reduction device, with the temperature reduced from 800 to 1000 DEG C at the inlet to below 200 DEG C at the outlet within 1 to 3 seconds, and is finally exhausted after being disposed by the bag-typed deduster; wherein, the content of the dioxin is not more than 0.2ngTEQ / m<3>. The device and the method of the invention reduce the content of the dioxin, generate a plurality of saturated steam at the same time and have the advantages of saving energy and reducing the steelmaking cost.

Description

Technical field: [0001] The invention relates to iron and steel smelting, in particular to the treatment of toxic substances in iron and steel smelting flue gas. Background technique: [0002] Dioxin is known as "the most toxic poison on earth". It is a highly toxic organic chemical substance containing chlorine. It hardly exists in nature. It can only be produced through chemical synthesis. It is the most terrible thing created by human beings. chemicals. In the metallurgical industry, chlorine-containing waste in scrap steel includes scrap steel containing salts, etc. When the high-temperature flue gas generated during high-temperature smelting in an electric furnace is cooled to below 600°C and above 300°C, the ash particles in the flue gas are Catalyst for dioxin formation. The major industrialized countries in the world have formulated specific measures to prevent and control dioxin pollution on the basis of previous investigations and studies, and have determined the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/70C21C5/52
CPCY02P10/20
Inventor 陈水盛陆平袁敏张志如郭晓东
Owner JIANGSU SHAGANG GROUP HUAIGANG SPECIAL STEEL CO LTD
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