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Removal device of tetrachlorodibenzo-p-dioxin in refuse burning system

A technology of waste incineration and dioxin, which is applied in the field of dioxin removal device in waste incineration system, can solve the problems of high price of activated carbon molecular sieve and low dioxin adsorption efficiency, and achieve good adsorption and absorption capacity, Effective adsorption, wide source effect

Inactive Publication Date: 2012-11-14
北京至清时光环保工程技术有限公司
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical problems in the prior art that activated carbon molecular sieves are expensive and the adsorption efficiency of dioxins is not strong, the present invention provides a device for removing dioxins in a waste incineration system. Pyromolecular sieves as adsorbents for dioxins

Method used

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  • Removal device of tetrachlorodibenzo-p-dioxin in refuse burning system
  • Removal device of tetrachlorodibenzo-p-dioxin in refuse burning system

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Flue gas flow: 82500m 3 / h, dioxin concentration: 5ng / m 3

[0026] Semi-coke molecular sieve refers to the above-mentioned lignite semi-coke and kaolin with a particle size of less than 200 meshes as raw materials. The mass ratio of lignite semi-coke to kaolin is 10:1, and a spherical molecular sieve with a diameter of 5mm is prepared by extrusion, and heated at 620 ° C. Prepared by roasting for 3h.

[0027] First, through the semi-coke molecular sieve inlet on the top of the flue gas purification tower, 30kg of the above-mentioned semi-coke molecular sieves are evenly arranged on the substrate, and the flue gas passes through the above-mentioned semi-coke molecular sieve through the waste incineration flue gas inlet to absorb dioxins in the waste incineration flue gas and removal, the dioxin content in the flue gas is reduced to 0.05ng / m at the outlet of waste incineration flue gas 3 , and then discharged through the chimney 5. The adsorbed semi-coke molecular siev...

Embodiment 2

[0029] Compared with Example 1, the only difference is that the semi-coke molecular sieve is a modified semi-coke molecular sieve, and the modified semi-coke molecular sieve is obtained through the following steps: first, the semi-coke molecular sieve is placed in 1.5mol / L NaOH The solution was crystallized at 90°C for 3h, washed with water to pH = 8, and then placed in 90°C, 0.5mol / L CaCl 2 Exchange in the solution for 2 hours. After the exchanged samples were washed and dried, they were placed in a 1mol / L oxalic acid solution at 80°C for 2 hours. After washing and drying, they were activated at 500°C for 2 hours. At the outlet of waste incineration flue gas, the content of dioxin in the flue gas is reduced to 0.03ng / m 3 .

Embodiment 3

[0031] Compared with Example 1, the difference is only in the described semi-coke molecular sieve. The semi-coke molecular sieve refers to the above-mentioned lignite semi-coke and kaolin with a particle size below 200 meshes as raw materials, and the mass ratio of lignite semi-coke to kaolin is 10: 1. Prepare a spherical molecular sieve with a diameter of 5mm by extrusion, and bake it at 550°C for 3 hours. At the outlet of waste incineration flue gas, the content of dioxin in the flue gas is reduced to 0.06ng / m 3 .

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Abstract

The invention relates to a removal device of tetrachlorodibenzo-p-dioxin in a refuse burning system. By means of the device, a semi-coke molecular sieve which is low in cost is utilized as an absorbing agent of the tetrachlorodibenzo-p-dioxin. The technical problems that in prior art, an activated carbon molecular sieve is expensive and absorbing efficiency and capacity of the activated carbon molecular sieve for the tetrachlorodibenzo-p-dioxin is poor can be solved. The removal device of the tetrachlorodibenzo-p-dioxin in the refuse burning system has an excellent purifying effect on the tetrachlorodibenzo-p-dioxin.

Description

technical field [0001] The invention relates to a waste gas treatment device, more specifically the invention relates to a device for removing dioxins in a garbage incineration system. Background technique [0002] With the rapid development of urbanization in China, the annual output of hundreds of millions of tons of garbage and the unbearable stench of garbage have become a barrier to urban development. Since garbage is rich in heavy metals such as hydrocarbons, organic chlorides and copper, during the process of garbage incineration, 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. Dioxin has carcinogenicity, teratogenicity, and immunotoxicity to humans, and is a highly toxic and harmful substance, so it must be thoroughly controlled. Dioxins that are ...

Claims

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Application Information

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IPC IPC(8): B01D53/04B01J20/20B01J20/34
Inventor 周琪
Owner 北京至清时光环保工程技术有限公司
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