Low-energy-consumption organic contaminated soil heterotopic thermal desorption process

Abstract

The invention discloses a low-energy-consumption organic contaminated soil heterotopic thermal desorption process. The heat of high-temperature soil treated through indirect heterotopic thermal desorption equipment is recycled to generate high-temperature water, and heat of thermal desorption tail gas spraying sewage is recycled to generate high-temperature water. A belt type drier is arranged infront of the thermal desorption equipment, the high-temperature water serves as a heat source to dry the soil, the water content of the soil entering the thermal desorption equipment is lowered, the energy utilization efficiency is improved, the operation cost is lowered, and the treatment capacity of the thermal desorption equipment is improved. As the drier is used for carrying out drying pretreatment on the soil, the pretreatment efficiency of the soil is improved, and the occupied area of the pretreatment process is reduced. Meanwhile, a burning method is used for carrying out final treatment on dry tail gas and thermal desorption tail gas, and pollutants are thoroughly decomposed.

Description

technical field [0001] The invention relates to the fields of environmental protection and soil restoration, in particular to an ex-situ thermal desorption process of low energy consumption organic polluted soil. Background technique [0002] Due to the extensive economic development model and people's lack of attention to the environment, the soil of chemical plants, pesticide plants, steel plants, electroplating plants and other enterprises is often polluted. With the development of the city, the land of these enterprises will be reused after relocation, so the soil needs to be repaired to meet the reuse standard. For organic contaminated soils, ex-situ thermal desorption has attracted widespread attention due to its high efficiency, wide treatment range, high remediation standards, and reliable technology, and is one of the mainstream technologies in soil remediation. [0003] Ex-situ thermal desorption is to heat the soil with high-temperature flue gas generated by comb...

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Problems solved by technology

[0007] In order to reduce the operating energy consumption of thermal desorption, the patent 201510749335.8 couples thermal desorption with biomass fluidized bed, the conditions of use are relatively harsh, and it is difficult to promote

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