Screw type indirect thermal desorption device for organic contaminated soil remediation

Abstract

The invention relates to a screw type indirect thermal desorption device for organic contaminated soil remediation. The screw type indirect thermal desorption device comprises an outer cylinder and ascrew which are arranged in the horizontal direction. The upper portion of the front end of the outer cylinder is fixedly connected with a feeding machine with scrapping materials, and the lower partof the rear end of the outer cylinder is fixedly connected with a discharging cylinder; three branch pipelines are arranged at the upper part of the outer cylinder for collecting tail gas; the three branch pipelines are gathered in a centralized pipeline, and a gas sampling opening is formed in the centralized pipeline. The screw rod is fixedly supported in the outer cylinder; a cavity used for heating soil is formed in the screw rod, the rear end of the cavity is used for introducing hot air, and the front end of the cavity is used for exhausting the hot air; and the flowing direction of thehot air in the cavity is opposite to the moving direction of soil. According to the device provided by the invention, a plurality of temperature detection devices and gas collection devices are arranged, a centralized control system is used for controlling data collection, and meanwhile, hot air in the thermal desorption process can be recycled, so that the organic contaminated soil remediation process is more energy-saving, environment-friendly and visual.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a screw-type indirect thermal desorption device for remediation of organic polluted soil. Background technique [0002] Due to the acceleration of industrialization and the shortage of land resources, the number of soil pollution sites is increasing, the scope of pollution is gradually expanding, and the types of soil pollutants are increasing. The problem of soil pollution has received more and more attention, and the problem of soil pollution needs to be solved urgently. [0003] The current soil remediation technologies mainly include physical remediation, chemical remediation, biological remediation, etc. Different technologies are suitable for different contaminated sites. Among many remediation technologies, thermal desorption is currently one of the most mature and widely used remediation technologies. [0004] Thermal desorption can be used for the remediation of ...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: to overcome the deficiencies of the prior art, to provide a screw-type indirect thermal desorption device for remediation of organic polluted soil, and to solve the problem of uneven heating during the thermal desorption process of the indirect thermal desorption device, and thermal desorption Poor adhesion, high energy consumption, and difficult to monitor and control working conditions

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