Multi-stage thermal desorption remediation system for organic polluted soil

Abstract

The invention relates to a multi-stage thermal desorption remediation system for organic polluted soil, and belongs to the technical field of soil remediation. The system consists of a first-stage thermal desorption device, a second-stage thermal desorption device, a tail gas treatment device, a secondary combustion chamber and a falling type conveying belt. Soil is preheated and desorbed primarily by high-temperature tail gas generated by thermal desorption; a two-stage or multi-stage polluted soil treatment method is adopted, and the residual heat of the tail gas is utilized fully, so that the comprehensive utilization ratio of heat energy of the system is improved obviously; soil enters a thermal desorption cabin with relatively high temperature under the gravity effect by virtue of the S-shaped falling type conveying belt, so that the energy consumption of a conveying and transmitting device and the conveying process is prevented; meanwhile, the soil conveying path and the conveying time are prolonged, the retention time is prolonged, and thus soil pollutants are desorbed relatively fully. The thermal desorption soil remediation system is reasonable in structure, is simple to operate, is convenient to use, has no secondary pollution, recycles residual heat of tail gas, and has wide application prospect and high practical value.

Description

Technical field [0001] The invention relates to a multi-stage thermal desorption remediation system for organic contaminated soil, which is mainly used for thermal desorption remediation of soil contaminated by volatile and semi-volatile organic pollutants, and belongs to the technical field of soil remediation. Background technique [0002] Soil is the ultimate destination of various pollutants, and the accumulation of pollutants has become one of its main environmental problems. Volatile organic compounds (VOCs) or semi-volatile organic compounds (SVOCs) enter the soil and pollute the soil and cause secondary pollution to surface water and groundwater, directly or indirectly endangering human health. In recent years, the problem of soil VOCs or SVOCs pollution in my country has become increasingly prominent, posing a serious threat to the ecological environment, food safety and human health. [0003] At present, methods such as landfill, incineration, biological treatment, and t...

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Problems solved by technology

For example, the Chinese Patent Publication No. CN 102029287 B, dated June 6, 2012, and the title of the invention is "a drum-type reverse thermal desorption system for organic matter-contaminated soil". The soil remediation system provided in this application can continuously feed materials, directly Heating realizes the full mixing of hot air and polluted soil, and the thermal desorption efficiency is high, but the repair system treats the tail gas and discharges it directly, without reusing the waste heat of the tail gas

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