Hot air circulation type indirect thermal desorption soil remediation system and method thereof

Abstract

The invention discloses a hot air circulation type indirect thermal desorption soil remediation system and method thereof, and belongs to the technical field of soil remediation. The system comprises a thermal desorption reactor, a dust remover, a hot air circulating fan, a hot air heater, an air preheater, a combustion fan, a combustion device and the like. Thermal desorption gas generated by soil heating volatilization is used as a heat transfer medium, contact type efficient heat transfer between hot air and soil is achieved in a cyclic heating mode, meanwhile, high-temperature flue gas is kept not to make direct contact with soil, and the advantages of being high in treatment capacity, small in equipment scale and the like are achieved.

Description

technical field [0001] The invention belongs to the technical field of soil remediation of polluted sites, is applicable to the remediation of organic polluted site soil, and specifically relates to a hot air circulation type indirect thermal desorption soil remediation system and a method thereof. Background technique [0002] Soil refers to the loose surface layer on the land surface that is fertile and capable of growing plants. When too many harmful substances discharged into the soil exceed the self-purification capacity of the soil, the composition, structure and function of the soil will change, and microbial activities will be inhibited. Harmful substances or Its decomposition products gradually accumulate in the soil through "soil → plant → human body", or are indirectly absorbed by the human body through "soil → water → human body", reaching the level of endangering human health, and soil pollution occurs. [0003] At present, the heavily polluted sites mainly incl...

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Problems solved by technology

Both of these two patents use indirect thermal desorption technology, the amount of tail gas to be purified is small, but the fluidity of the solid soil is poor, and the complex reactor structure will lead to failures such as blockage, so under the condition of convenient disassembly and transportation, the scale of the equipment is limited. limited, the heat transfer area is small, resulting in low heat transfer efficiency, and the processing capacity of the equipment is usually only about 3-4 tons per hour

However, the amount of soil that needs to be repaired in polluted sites is often thousands or even tens of thousands of tons. The current equipment processing capacity is far from meeting the repair needs, and the repair period is very long, which restricts the application and promotion of indirect thermal desorption technology.

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