Device and method for sectional type thermal remediation of organic contaminated soil

Abstract

The invention relates to a device and method for sectional type thermal remediation of organic contaminated soil, and belongs to the field of soil remediation. Organic contaminated soil is fed into astirring type preheating device and indirectly exchanges heat with a circulating heat exchange medium in the device, the organic contaminated soil is continuously stirred and heated, moisture and light organic pollutants in the soil are separated out in the heating process and are condensed by a condensing device A and then fed into a non-condensable gas storage tank to be stored; the preheated soil is fed into a thermal desorption device and is subjected to direct contact type heat exchange with high-temperature non-condensable gas from a combustion heat exchanger; the preheated soil is heated to a higher temperature; residual organic pollutants in the soil are subjected to a thermal desorption reaction; a desorbed gas product is fed into a condensing device B to be condensed, condensateenters a condensate storage tank, high-temperature soil obtained after thermal desorption is fed into a granular bed air cooling device, residual trace organic matter in the high-temperature soil andoxygen in the air are subjected to a micro-combustion reaction and cooled by the air, and finally the soil is discharged in a low-temperature clean soil mode.

Description

technical field [0001] The invention belongs to the field of soil remediation, and in particular relates to a device and method for segmented thermal remediation of organic polluted soil. Background technique [0002] With the acceleration of urbanization and industrialization in my country, the proportion of organically polluted soil is increasing year by year. Soils with high organic content will transfer pollutants to crops along with agricultural planting, and then enter the human body through the food chain, seriously endangering human health. Therefore, the control of soil pollution is urgent. [0003] At present, the thermal remediation methods of organic contaminated soil mainly adopt incineration technology and thermal analysis technology. The supporting facilities of incineration treatment equipment are complex, occupy a large area, and have high investment and operating costs; thermal analysis method is considered to be one of the cleaner technologies for treating...

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Problems solved by technology

[0003] At present, the thermal remediation methods of organic contaminated soil mainly adopt incineration technology and thermal analysis technology. The supporting facilities of incineration treatment equipment are complex, occupy a large area, and have high investment and operating costs; thermal analysis method is considered to be one of the cleaner technologies for treating organic contaminated soil. , while the conventional thermal analysis method has problems such as low heat transfer efficiency and high process energy consumption, which have seriously restricted the development of this technology.

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