Method for removing dioxin in waste incineration flue gas and equipment thereof

A waste incineration and dioxin technology, which is applied in the field of waste gas treatment, can solve the problems of increasing the amount of powdered activated carbon, consuming large powdered activated carbon, and limited dioxin removal rate, achieving significant effect, increased specific surface area, The effect of improving the adsorption utilization rate

Active Publication Date: 2010-05-19
TIANJIN TEDA ENVIRONMENTAL PROTECTION
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method mainly has the following defects: 1) In order to reduce the dioxin content in the waste incineration flue gas to the EU standard, a large amount of powdered activated carbon must be consumed, usually 15-20kg / h, and the annual operating cost is about 1.5 million yuan. Heavy burden; 2) Dioxin removal rate is limited, the lowest can be reduced to 0.05-0.06ng / m 3 , and the amount of powdered activated carbon needs to be doubled

Method used

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  • Method for removing dioxin in waste incineration flue gas and equipment thereof
  • Method for removing dioxin in waste incineration flue gas and equipment thereof
  • Method for removing dioxin in waste incineration flue gas and equipment thereof

Examples

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Effect test

Embodiment 1

[0017] Flue gas flow: 83816m 3 / h, dioxin concentration: 5ng / m 3 . (The above values ​​are converted to 11% oxygen content on a dry basis)

[0018] First, 6kg / h powdered activated carbon 2 is sprayed into the flue through a venturi injector 3, and the dioxins in the waste incineration flue gas are initially removed, and then the flue gas enters the bag filter 4 for dust removal, and the remaining trace dust is in the When the flue gas flows through the inlet of the filter device 7, it is intercepted by about 10kg of activated carbon fibers 8. After the flue gas passes through the filter device 7, dioxin is successively adsorbed on the granular activated carbon 6 and about 20kg of activated carbon fiber 8 at the outlet of the flue gas, and the content is reduced to 0.02ng / m 3 , discharged through the chimney 5. The granular activated carbon 6 removed from the bottom of the filtering device 7 enters the pulverizer 9 and is pulverized into powdered activated carbon 2, and the...

Embodiment 2

[0021] Flue gas flow: 92500m 3 / h, dioxin concentration: 10ng / m 3 . (The above values ​​are converted to 11% oxygen content on a dry basis)

[0022] First, 10kg / h powdered activated carbon 2 is sprayed into the flue through the venturi injector 3, and the dioxins in the waste incineration flue gas are initially removed, and then the flue gas enters the bag filter 4 for dust removal, and the remaining trace dust is in the When the flue gas flows through the inlet of the filter device 7, it is intercepted by about 10kg of activated carbon fibers 8. After the flue gas passes through the filter device 7, dioxins are successively adsorbed on the granular activated carbon 6 and about 40kg of activated carbon fibers 8 at the outlet of the flue gas, and the content is reduced to 0.02ng / m 3 , discharged through the chimney 5. The granular activated carbon 6 removed from the bottom of the filtering device 7 enters the pulverizer 9 and is pulverized into powdered activated carbon 2, ...

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Abstract

The invention discloses a method for removing dioxin in waste incineration flue gas, which comprises the following steps of: a) first adopting a combined process of a Venturi jet and a dry dust collector to remove the dioxin; b) then adopting filtration equipment to remove the dioxin; c) allowing granular activated carbon absorbing the dioxin to be discharged through the bottom of the filtration equipment and enter a crushing machine to be crushed into powdery activated carbon; d) supplying the powdery activated carbon to the Venturi jet for use; and e) discharging purified waste incineration flue gas which is output from a flue gas outlet of the filtration equipment into the atmosphere through a chimney. The invention also discloses equipment for implementing the method. The method and the equipment can increase the removal rate of the dioxin and reduce operating cost.

Description

technical field [0001] The invention relates to a waste gas treatment method, in particular to a method for removing dioxins in waste incineration flue gas. The invention also relates to a device for implementing the method. Background technique [0002] Disposal of garbage is commonly done by incineration. Since garbage is rich in heavy metals such as hydrocarbons, organic chlorides, and copper, during the incineration process, hydrocarbons and organic chlorides will undergo chemical reactions at 280-450° to form dioxins. In the formation reaction of the above-mentioned dioxins, the copper substances (metallic copper, copper oxide and copper ions) contained in the garbage acted as a catalyst. The English name of dioxin is Dioxins, abbreviated as DXN. It has carcinogenicity, teratogenicity and immunotoxicity to humans. It is a highly toxic and harmful substance, so it must be thoroughly controlled. People have tried to use cheap and easy-to-obtain granular activated carbo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/83B01D53/75B01D53/70B01D46/30F23G7/00
CPCY02A50/2351
Inventor 韩檬高建东张曙光徐朝阳刘汉桥郝永俊董珂
Owner TIANJIN TEDA ENVIRONMENTAL PROTECTION
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