Ex-situ soil thermal desorption device

Abstract

The invention discloses an ex-situ soil thermal desorption device. Soil to be repaired is preheated through heat of bottom residues of a biomass circulating fluidized bed boiler through a heat pipe heat exchange manner; then a direct heat exchange manner is used for desorbing pollutants in soil through heat of circulating ash of the biomass circulating fluidized bed boiler; and meanwhile fertility of the repaired soil is improved through active ingredients in the circulating ash, and gaseous pollutants generated through desorption are introduced into the boiler to be incinerated and decomposed. The device achieving the method comprises a slag conveying room, a first cold residue room, a second cold residue room, a third cold residue room, an inertia separating room, a preheating room, an analyzing room and a heat regeneration room. According to the ex-situ soil thermal desorption device, thermal desorption of the soil is achieved based on waste heat of the bottom residues of the boiler, meanwhile, fertilizer of the soil is improved by mixing active ingredients, volatile pollutants generated through desorption are sent into the boiler to be directly incinerated, and secondary pollution is avoided.

Description

technical field [0001] The invention relates to an ex-situ soil thermal desorption device, which belongs to the technical field of soil pollution control. Background technique [0002] Soil thermal desorption is one of the effective methods for remediating polluted soil. It is a process of heating organic pollutants in the soil to a high enough temperature to separate them from the soil through direct or indirect heating. Obviously, soil thermal desorption requires a lot of heat, and the desorbed gaseous pollutants need special equipment for purification. Therefore, the actual soil thermal desorption method often has problems such as high equipment energy consumption, complex equipment structure, and expensive operation costs. [0003] The biomass circulating fluidized bed boiler is a typical equipment for the horizontal function expansion of circulating fluidized bed boilers. This equipment can not only process straw-like agricultural and forestry wastes, but also produce ...

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Problems solved by technology

[0005] Purpose of the invention: The present invention aims at the problems that a large amount of heat needs to be consumed in the conventional soil thermal repair process, the fertility of the repaired soil is reduced due to the decrease in pH value, and the generated thermal analysis gas is likely to cause secondary pollution due to the presence of polluting organic substances. An ex-situ soil thermal desorption device

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