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System and method for removing dioxin from fly ash

A dioxin removal technology, which is applied in separation methods, chemical instruments and methods, and solid waste removal, etc., can solve the problems of incineration fly ash disposal cost constraints, and the difficulty of popularization and application of the technology.

Inactive Publication Date: 2021-05-11
四川深蓝环保科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the disposal of incineration fly ash in my country is limited by the cost of disposal, and technologies with high disposal costs such as high-temperature melting, mechanical ball milling, gas-phase chemical reduction, plasma, and supercritical water oxidation are difficult to popularize and apply in the short term

Method used

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  • System and method for removing dioxin from fly ash
  • System and method for removing dioxin from fly ash

Examples

Experimental program
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Effect test

Embodiment 1

[0041]A flying ash removes the dioxin system, such asFigure 1-2As shown, including the sequentially connected fly ash silicon, dioxin removal device, discharge delivery device, and detoxification flyer bin, further comprising a catalyst mixing apparatus, the catalyst mixing device is disposed in a fly ash bin and two There is a CA-containing compound and a transition metal oxide in the catalyst added in the catalyst mixing apparatus, and in particular, the catalyst comprising a desulfurized lime powder CaO, Ca (OH) 2 and CaCO3 As a Ca-containing compound, MgO, manganese dioxide, and silica are contained as a transition metal oxide. Preferably, Na2CO3, sodium citrate is further included. Under low temperature heat treatment decologic conditions, it is not possible to provide a lower chance of reacting with hydroxy radicals and high energy, hydroxylation, and benzene crackers. Dichloro / Hydrogenation is considered to be the main pathway of dioxin removal over a period of time. By set...

Embodiment 2

[0060]A fly ash removes the dioxide system, replacing the catalyst mixing apparatus in Example 1, such asFigure 1-2As shown, the catalyst mixing device is a liquid spray mixing device. The catalytic solvent can be better mixed with fly ash, which makes the reaction more sufficient and more efficient.

[0061]Correspondingly, this example also discloses a fly ash removal dioxide method, including the following steps:

[0062]A. Insert nitrogen into the dioxinum removal device, and form an oxygen in the dioxin removal device;

[0063]B. In the fly ash fly ash stored in the fly, fly, fly as average, and the catalyst is sufficiently mixed with the catalyst to obtain a fly ash mixture, and the dioxin removal device is given by the feed gas lock valve;

[0064]C. In the dioxin removal device, the fly ash mixture is heated to 450 ° C by external heat insulating heating, and the reaction time is 15 min, and the dioxin is removed.

[0065]D. Tixin fly as average enters the discharge screw conveyor by the d...

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Abstract

The invention discloses a system and method for removing dioxin from fly ash, and relates to the technical field of household garbage incineration fly ash treatment. The system for removing dioxin from fly ash comprises a fly ash bin, a dioxin removing device, a discharging and conveying device and a detoxification fly ash bin which are sequentially connected and further comprises a catalyst mixing device, the catalyst mixing device is arranged between the fly ash bin and the dioxin removing device, and a catalyst in the catalyst mixing device comprises a Ca-containing compound and a transition metal oxide. According to the system and method for removing dioxin from fly ash, the fly ash and the catalyst are mixed and can be subjected to high-efficiency low-temperature pyrolysis, and detoxified fly ash is obtained; the process system is simple and efficient, the number of devices is small, and the requirement for removing the dioxin in the incinerated fly ash can be met with low cost; and reaction environment is anaerobic, and the efficiency of removing the dioxin in the fly ash is effectively improved.

Description

Technical field[0001]The present invention relates to the field of domestic waste incineration flying ash processing, and therefore specifically involves a flying ash removal of dioxin system and method.Background technique[0002]Domestic waste incineration fly ash (hereinafter referred to as "flying gray") is the flue gas purification system of domestic waste incineration facilities and the bottom ash of the flue and the bottom of the chimney. A variety of toxic and hazardous substances such as heavy metals, dioxines, chlorinated salts are enriched, and therefore included in the National Hazardous Waste Directory, and the waste category is HW18, the waste number is 772-002-18. "GB / T1134-2020" Domestic Waste Incineration Fly Ash Pollution Control Technical Specification (Trial) ":" The dioxide content in the fly ash treatment product should be controlled, which can be used for low temperature heat decomposition, high temperature sintering and high temperature melting. Dioxation tec...

Claims

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Application Information

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IPC IPC(8): B09B3/00B01D45/16B01D50/00
CPCB09B3/00B01D45/16B01D50/00B01D2258/0283B09B2101/30
Inventor 谢非张超邬冕夏洲荀锐
Owner 四川深蓝环保科技有限公司
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