A vertical internal circulation soil thermal desorption device

Abstract

The invention relates to a vertical internal circulation soil thermal desorption device, which includes a material circulation unit, a flue gas circulation unit and a waste heat recovery unit; the material circulation unit includes a preheating section, an initial desorption unit, and a preheating section that are sequentially connected along the material flow direction to form a circulation loop. chamber, deep desorption chamber and material return chamber; the flue gas circulation unit includes a combustion chamber, an inner heating chamber and an outer heating chamber connected in sequence along the flue gas flow direction; the inner heating chamber and the outer heating chamber are respectively formed inside the primary desorption chamber and the outside; the combustion chamber and the deep desorption chamber have the same wall; a separation chamber for separating fine particles and heating the preheating section is formed between the inner heating chamber, the initial desorption chamber and the return chamber, and the inner and outer heating chambers are connected. The primary desorption chamber is connected with the separation chamber, and the gas outlet section of the separation chamber and the external heating chamber act on the preheating section simultaneously from both sides. The invention improves the desorption efficiency through the cascade utilization of energy and the internal circulation of materials.

Description

technical field [0001] The invention relates to the technical field of soil thermal desorption, in particular to a vertical internal circulation soil thermal desorption device. Background technique [0002] In the prior art, organic contaminated soil remediation technologies are mainly divided into three categories: physical remediation, chemical remediation, and biological remediation, as well as combined remediation technologies based on the above technologies. Among them, the thermal desorption repair technology is one of the most effective methods of ectopic desorption. It uses the method of heating the polluted soil to volatilize the organic pollutants, which has the advantages of high pollutant removal efficiency, short repair period, wide application range and excellent process technology. The principle is simple and so on. [0003] The main equipment of existing thermal desorption devices usually adopts a horizontal rotary kiln structure. Although great results have...

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Problems solved by technology

[0004] Aiming at the defects of the prior art, the present invention provides a vertical internal circulation soil heat desorption device, which solves the technical problem of low desorption efficiency through cascade utilization of energy and internal circulation of materials

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