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Contaminated soil thermal decomposition tail gas treatment method

A technology for exhaust gas treatment and polluted soil, applied in the field of polluted soil remediation, can solve the problems of high processing cost and high energy consumption, and achieve the effects of reducing the processing cost, being conducive to wide application, safe and effective processing

Inactive Publication Date: 2014-09-24
BEIJING BUILDING MATERIALS ACADEMY OF SCI RES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thermal desorption is suitable for the treatment of soil contaminated by volatile or semi-volatile organic compounds. It has the characteristics of high treatment efficiency, no secondary pollution, and usable soil after remediation, but there are also problems of high energy consumption and high treatment cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for treating polluted soil thermal desorption tail gas, which is to treat the tail gas discharged from the gas phase outlet of the thermal desorber, and remove the particulate matter and pollutants in the tail gas produced by the thermal desorption of the polluted soil, so that the tail gas can be purified to meet the discharge standard. The method Including: dust removal treatment, catalytic combustion, cooling treatment and absorption treatment, among which:

[0025] The dust removal treatment: the tail gas discharged from the gas phase outlet of the thermal analyzer passes through the filter bag to remove particles; in order to effectively remove particles, after the contaminated soil is thermally desorbed, the organic pollutants in the soil are decomposed, and the dust generated during the thermal desorption process To form flue gas with particulate matter, firstly, dust removal treatment is carried out. The dust removal treatment of flue gas is carried out ...

Embodiment 2

[0030] This embodiment is a preferred solution of Embodiment 1, so the content of Embodiment 1 should also be regarded as the content not shown in this embodiment.

[0031] In this embodiment, in the catalytic combustion process, according to the type and content of organic pollutants in the exhaust gas, the catalytic combustion temperature can be controlled at 200°C, 300°C, 400°C, 500°C, and 600°C respectively. , the running time can be appropriately extended or shortened according to the temperature, but it must be guaranteed to be more than 2 seconds.

[0032] In an embodiment, in the composite oxide of the carrier and manganese oxide and one or more elements of Ce, Zr, Ti, Co, Fe, Cu: the carrier is a mesoporous molecular sieve, and the manganese oxide and The composite oxides of one or more elements in Ce, Zr, Ti, Co, Fe, Cu are: manganese oxide and Ce, the content is 65% and 35% of the total; manganese oxide and Ti, the content They are 76% and 24% of the total respecti...

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Abstract

The invention discloses a contaminated soil thermal decomposition tail gas treatment method. The contaminated soil thermal decomposition tail gas treatment method comprises the steps of dust removal treatment, catalytic combustion, cooling treatment and absorption treatment, wherein according to the catalytic combustion, tail gas without particles is fed into a catalytic combustion chamber to be subjected to catalytic combustion, the combustion process is a process with catalytic combustion through catalysts, the temperature of catalytic combustion ranges from 200 DEG C to 600 DEG C, and the time of catalytic combustion is two seconds or longer. Compared with an existing tail gas high-temperature incineration method, the contaminated soil thermal decomposition tail gas treatment method has the advantages that due to the fact that the tail gas is treated with a catalytic combustion method, the damage and removal rate of organic pollutants is more than 99%, and the tail gas is treated efficiently, safely and effectively; due to the fact that tail gas treatment is carried out at low temperature, energy consumed in the tail gas treatment process is about only half of the energy consumed in high-temperature incineration, the treatment cost of thermal decomposition is remarkably reduced, and the contaminated soil thermal decomposition technology can be widely applied easily.

Description

technical field [0001] The invention relates to the technical field of contaminated soil remediation, in particular to a method for treating contaminated soil thermal analysis tail gas. Background technique [0002] As a kind of contaminated soil remediation technology, thermal analysis has developed rapidly in recent years because of its effectiveness in the treatment of organic-contaminated soil. reports. [0003] Thermal desorption means that by heating the polluted soil, the polluted soil is heated to a sufficient temperature, and the pollutants are volatilized and separated from the soil, so that the soil can be purified. Thermal desorption is suitable for the treatment of soil contaminated by volatile or semi-volatile organic compounds. It has the characteristics of high treatment efficiency, no secondary pollution, and usable soil after remediation. However, it also has the problems of high energy consumption and high treatment cost. Generally, the thermal desorptio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14B01D46/02F23G7/07
Inventor 朱延臣李春萍杨飞华
Owner BEIJING BUILDING MATERIALS ACADEMY OF SCI RES
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