Auxiliary heating system for extraction tube in in situ thermal desorption remediation of soil

Abstract

An auxiliary heating system for extraction pipes used in in-situ thermal desorption restoration of soil, comprising an extraction pipe body, a heating strip is spirally wound on the outside of the extraction pipe body along the axial direction, and the heating strip includes a flexible heat-conducting The casing and the heating module are arranged in the flexible heat-conducting casing, and a plurality of sealed heat storage bags are evenly arranged on the side of the flexible heat-conducting casing facing the soil, and the heat storage bags are filled with heat storage materials. The invention provides auxiliary heating for the gas-phase extraction tube in the in-situ thermal desorption restoration process, uses soil waste heat to heat the extraction pipe during the restoration process, and uses conduction auxiliary heating when the soil waste heat is insufficient, so as to solve the problem in the process of repairing deep soil Insufficient soil temperature in the upper layer causes pollutants to condense and block the extraction pipeline.

Description

technical field [0001] The invention belongs to the field of soil remediation, in particular to an auxiliary heating system for extraction pipes in in-situ thermal desorption remediation of soil. Background technique [0002] In-situ thermal desorption soil remediation technology is widely used in the field of soil remediation. In the process of remediating deep soil, usually only the contaminated soil layer is heated, which leads to inconsistent temperatures of the extraction tubes for extracting organic pollutant vapors at different depths. In some depths, the pollutants may condense and block the extraction due to insufficient temperature. Lifting the tube will affect the repair effect. Sometimes in order to maintain the temperature of the extraction tube, the non-contaminated layer is also heated, which consumes a lot of heat and greatly increases the energy consumption and cost of repair. Contents of the invention [0003] The invention solves the deficiencies of th...

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Problems solved by technology

[0003] The invention solves the deficiencies of the prior art and provides a simple structure, which can use the waste heat of the soil to heat the extraction pipe, and uses conduction auxiliary heating when the waste heat of the soil is insufficient, and solves the pollution caused by the insufficient temperature of the upper soil in the process of repairing the deep soil. Auxiliary heating system for extraction pipes in soil in-situ thermal desorption remediation for the problem of solidification and blockage of extraction pipes

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