Thermal desorption remediation device for polluted soil

Abstract

The invention relates to the technical field of soil treatment, in particular to a thermal desorption remediation device for polluted soil. The device comprises a treatment device, a material guide pipe and a spiral conveyor which are sequentially connected together from top to bottom, inner cavities of the treatment device, the material guide pipe and the spiral conveyor are communicated, and the spiral conveyor and the material guide pipe are located on one side of the top of the spiral conveyor; and a fixed pipe with the same inner diameter as the material guide pipe is installed in the middle of the inner bottom of the treatment device, the fixed pipe is sleeved with a movable pipe, a transmission column is further vertically installed in the treatment device, the tail end of the transmission column extends into the fixed pipe, and spiral blades are installed on the outer wall of the transmission column. The retention time of soil between the movable pipe and the fixed pipe is prolonged through a guide plate and a buffer strip, the heating efficiency is improved, the treated soil enters the spiral conveyor through the material guide pipe to be conveyed, the treated soil makes contact with inlet air in the reverse convection direction in the conveying process, secondary thermal desorption is conducted, the contact time between the soil and hot air is prolonged, and through two times of thermal desorption, the thermal desorption efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of soil treatment, in particular to a thermal desorption restoration device for polluted soil. Background technique [0002] Soil remediation is a technical measure to restore contaminated soil to normal functions. In the soil remediation industry, there are more than one hundred existing soil remediation technologies, and there are more than ten commonly used technologies, which can be roughly divided into three types: physical, chemical and biological. The method, thermal desorption, refers to the process of volatilizing and separating organic pollutants and metal mercury in polluted soil through direct or indirect heat exchange, and effectively collecting and treating the volatilized pollutants. . As a non-combustion technology, thermal desorption has a wide range of pollutant treatment, removable equipment, and reusable soil after restoration. Especially for chlorine-containing organic compounds, non-ox...

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Problems solved by technology

[0004] In order to solve the problem that the existing restoration device has a short contact time with the soil, which affects the effect of thermal desorption, and at the same time, the soil is easy to agglomerate, which makes the heating speed slow and causes waste of heat energy, and provides a thermal desorption restoration device for polluted soil. Meet actual use needs

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