Purification system and method for flue gas in continuous feeding electric-arc furnace

A flue gas purification system and flue gas purification technology are applied in the field of flue gas purification to achieve the effects of shortening the synthesis reaction time, helping to protect the environment, and reducing the production of toxic and carcinogenic dioxins

Pending Publication Date: 2018-11-16
江苏久华环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially for electric arc furnaces with continuous feeding, such as Consdie electric furnace, steel scrap is preheated by high-temperature flue gas in the continuous feeding system. Although a lot of energy is saved, it also brings new environmental problems. Harmful impurities in steel scrap and high-temperature smoke Gas contact, will produce a lot of harmful gases such as dioxin

Method used

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  • Purification system and method for flue gas in continuous feeding electric-arc furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The temperature at the exhaust outlet 1 of the scrap steel preheating section is 700°C. The high-temperature flue gas enters the settling chamber 3 through the water-cooled elbow 2 for pre-settling dust removal, and then enters the evaporative cooling tower 5 through the heat preservation flue 4, and the heat preservation flue 4 The dioxin toxic carcinogens in the flue gas are basically decomposed and destroyed, and the evaporative cooling tower 5 is rapidly cooled to 200°C at a rate of 200°C / s to shorten the synthesis reaction time of the dioxin toxic carcinogens in the flue gas, that is, Reduce the production of toxic and carcinogenic dioxins. The rapidly cooled flue gas enters the bag filter 6 for fine dust removal. The final flue gas temperature is 76°C and the dust concentration is 8.2mg / Nm 3 , containing dioxin 0.38mg / Nm 3 , up to emission standards.

Embodiment 2

[0028] The temperature at the exhaust port 1 of the scrap steel preheating section is 900°C, and the high-temperature flue gas enters the settling chamber 3 through the water-cooled elbow 2 for pre-settling dust removal, and then enters the evaporative cooling tower 5 through the heat preservation flue 4, and the heat preservation flue 4 The dioxin toxic carcinogens in the flue gas are basically decomposed and destroyed, and the evaporative cooling tower 5 is rapidly cooled to 210°C at a rate of 300°C / s to shorten the synthesis reaction time of the dioxin toxic carcinogens in the flue gas, that is, Reduce the production of toxic and carcinogenic dioxins. The flue gas after rapid cooling enters the bag filter 6 for fine dust removal. The final flue gas temperature is 79°C and the dust concentration is 8.9mg / Nm 3 , containing dioxin toxic carcinogen 0.42mg / Nm 3 , up to emission standards.

Embodiment 3

[0030] The temperature at the exhaust outlet 1 of the scrap steel preheating section is 1000°C. The high-temperature flue gas enters the settling chamber 3 through the water-cooled elbow 2 for pre-settling dust removal, and then enters the evaporative cooling tower 5 through the heat preservation flue 4, and the heat preservation flue 4 The dioxin toxic carcinogens in the flue gas are basically decomposed and destroyed, and the evaporative cooling tower 5 is rapidly cooled to 228°C at a rate of 400°C / s to shorten the synthesis reaction time of the dioxin toxic carcinogens in the flue gas, that is, Reduce the production of toxic and carcinogenic dioxins. After rapid cooling, the flue gas enters the bag filter 6 for fine dust removal. The final flue gas temperature is 83°C and the dust concentration is 8.6mg / Nm 3 , containing dioxin toxic carcinogen 0.41mg / Nm 3 , up to emission standards.

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Abstract

The invention relates to a purification system and method for flue gas in a continuous feeding electric-arc furnace. The flue gas purification system comprises a water cooling elbow, a settling chamber, an insulating flue, an evaporative cooling tower, a bag-type dust collector and a discharging device; one end of the water cooling elbow communicates with a smoke outlet of a steel scrap preheatingsection of the electric-arc furnace in a sealing mode; the other end of the water cooling elbow is introduced into the settling chamber in a sealing mode; the insulating flue is provided with a low end and a high end, and the low end of the insulating flue communicates with the upper portion of the settling chamber in a sealing mode; the evaporative cooling tower is provided with a flue gas inletand a flue gas outlet, and the high end of the insulating flue communicates with the flue gas inlet of the evaporative cooling tower in a sealing mode; the bag-type dust collector is provided with aflue gas inlet and a flue gas outlet, and the flue gas inlet of the dust collector communicates with the flue gas outlet of the evaporative cooling tower through a pipeline with a mixer selector valve; and the discharging device communicates with the flue gas outlet of the dust collector. According to the purification system and method for the flue gas in the continuous feeding electric-arc furnace, the content of toxic cancerogenic substances such as dioxin in purified flue gas is greatly decreased, and the cooling water demand quantity is significantly decreased.

Description

technical field [0001] The invention relates to the technical field of flue gas purification, in particular to a system and method for purifying flue gas in a continuous feeding electric arc furnace. Background technique [0002] During the smelting process, the electric arc furnace will produce a large amount of high-temperature flue gas, and there are harmful substances such as dust in the flue gas. Especially for electric arc furnaces with continuous feeding, such as Consdie electric furnace, steel scrap is preheated by high-temperature flue gas in the continuous feeding system. Although a lot of energy is saved, it also brings new environmental problems. Harmful impurities in steel scrap and high-temperature smoke Gas contact will produce a large amount of harmful gases such as dioxins. How to purify the flue gas in the electric arc furnace, so that the emission of particulate matter in the flue dust reaches the standard, and eliminate harmful substances such as dioxins...

Claims

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Application Information

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IPC IPC(8): F27D17/00
CPCF27D17/008Y02P10/25
Inventor 朱国平查显文刘文武王艳龙
Owner 江苏久华环保科技股份有限公司
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