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Tank-type thermal desorption device based on thermal desorption additive filling and desorption method

A technology of thermal desorption and thermal desorption unit, which is applied in the field of contaminated soil treatment, can solve the problems of reduced organic pollutant removal rate, residual, and increased tail gas treatment burden, and achieves significant thermal desorption effect, simple structure, and improved thermal efficiency. The effect of desorption efficiency

Active Publication Date: 2020-12-11
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most thermal desorption devices use heat to volatilize organic pollutants into waste gas and then treat them, which will increase the burden of tail gas treatment, and some organic matter remains in the soil, resulting in a decrease in the removal rate of organic pollutants

Method used

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  • Tank-type thermal desorption device based on thermal desorption additive filling and desorption method
  • Tank-type thermal desorption device based on thermal desorption additive filling and desorption method
  • Tank-type thermal desorption device based on thermal desorption additive filling and desorption method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Such as figure 1 As shown, a tank-type thermal desorption device based on thermal desorption additive filling is characterized in that it includes a support frame 1, and a thermal desorption unit 2, a drive control unit 3, and an exhaust gas treatment unit located above the support frame 1 4; the thermal desorption unit 2 includes a thermal desorption tank 22 connected to the top of the support frame 1 by a support foot 21, and the thermal desorption tank 22 is provided with an electric heating jacket 23 for providing a heat source inside the thermal desorption tank 22, and the thermal desorption tank 22 The top of the desorption tank 22 is provided with a feed inlet 24, the top of the feed inlet 24 is connected with a soil pretreatment mechanism 25, and the center position of the bottom of the thermal desorption tank 22 is provided with a rotating shaft 26, and the upper end of the rotating shaft 26 is detachably connected with The rotary dial 27 filled with thermal de...

Embodiment 2

[0041] This example is basically the same as Example 1, except that the thermal desorption aid only has calcium peroxide particles as the A-type aid.

[0042] After thermal desorption, the removal rate of VOCs benzene was 81.2%, the removal rate of chlorinated organic compounds CVOCs was 79.1%, the removal rate of polycyclic aromatic hydrocarbons PAHs was 76.8%, and the removal rate of polychlorinated biphenyls PCBs was 77.4%.

Embodiment 3

[0044] This embodiment is basically the same as that of Embodiment 1, except that the thermal desorption auxiliary agent is only B-type auxiliary agent adsorbed with alumina balls of hydrogen peroxide solution.

[0045] After thermal desorption, the removal rate of VOCs benzene was 90.1%, the removal rate of chlorinated organic compounds CVOCs was 91.4%, the removal rate of polycyclic aromatic hydrocarbons PAHs was 89.7%, and the removal rate of polychlorinated biphenyls PCBs was 88.5%.

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Abstract

The invention discloses a tank type thermal desorption device based on thermal desorption additive filling and a desorption method thereof. The device comprises a supporting frame, a thermal desorption unit, a drive control unit and a tail gas treatment unit, the thermal desorption unit, the drive control unit and the tail gas treatment unit are at the upper part of the supporting frame, and the thermal desorption unit comprises a thermal desorption tank sleeved with an electric heating sleeve; the bottom of the thermal desorption tank is rotationally connected with a rotating poking wheel filled with a thermal desorption additive through a rotating shaft; the driving control unit comprises an electric box, a motor and a transmission assembly connected with the rotating shaft; and the tailgas treatment unit comprises an adsorption box body filled with an adsorption filler. According to the invention, alumina balls adsorbed with a hydrogen peroxide solution are used as a low-temperature thermal desorption auxiliary agent, calcium peroxide is used as a high-temperature thermal desorption auxiliary agent, and the soil is fully distributed in two poking pieces filled with the thermaldesorption auxiliary agents by virtue of centrifugal rotation of the rotary poking wheel, so that oxygen decomposed by heating can be uniformly dispersed into the soil, and the thermal desorption efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of contaminated soil treatment, in particular to a tank-type thermal desorption device and a desorption method based on thermal desorption additive filling. Background technique [0002] Soil thermal desorption is one of the methods to remove pollutants in organic polluted soil. Heating method is used to heat organic polluted soil to close to or exceed the boiling point of organic matter, so that organic pollutants can be volatilized and separated from the soil, and then the desorbed waste gas processing to achieve the purpose of restoration. Thermal desorption can effectively remove volatile and semi-volatile organic pollutants in soil, such as: volatile organic compounds (VOCs), polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), etc. [0003] The Chinese utility model patent with the publication number CN203578349U discloses an environmentally friendly and energy-saving thermal des...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/06B02C4/08B02C4/42
CPCB09C1/06B02C4/08B02C4/42
Inventor 石佳奇杨璐龙涛黄剑波应蓉蓉郭洋陈朦温冰
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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