Multi-heat source and shaftless intervallic heating type thermal desorption device for organic pollutant contaminated soil repair

Abstract

The invention relates to the field of environmental protection, and aims to provide a multi-heat source and shaftless intervallic heating type thermal desorption device for the organic pollutant contaminated soil repair. The device comprises an intervallic heating type thermal desorption machine being a jacket type heating furnace, as well as an inner cylinder and an outer cylinder arranged in the horizontal direction, wherein a soil feeding port, an unearthing machine, a multi-heat source inlet and a multi-heat source outlet are formed in the outer cylinder; a carrier gas inlet and a carrier gas outlet are formed in the inner cylinder; a shaftless rotating shaft formed by continuous spiral blades is arranged in the inner cylinder. The device is particularly suitable for repairing high-concentration and multi-component organic pollutant contaminated soil fields, has excellent adaptability to various heat sources, improves the synthetic utilization efficiency of the heat sources, reduces the amount of smoke required to be treated, facilitates the heat exchange between the various heat sources and the soil, improves the heat transfer efficiency, has great soil processing capacity in unit time, and is particularly suitable for sandy contaminated soil.

Description

technical field [0001] The invention relates to a set of organic pollutant polluted soil restoration device, which desorbs organic pollutants in soil through an indirect thermal desorption system, and belongs to the field of environmental protection. Background technique [0002] A large amount of soil in my country has been polluted by organic pollutants. The types of pollutants include pesticides used in agricultural production, polychlorinated biphenyls used in the power industry, and accidental oil spills in the oil industry. With the gradual public awareness of the environmental and health hazards of organic pollutants, there is an urgent need for economical and effective methods to deal with these toxic substances. [0003] The main remediation technologies for soil contaminated by organic pollutants include biological remediation, chemical remediation, and physical remediation. Bioremediation is mostly in-situ repair, which has small investment, low operating cost, m...

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Problems solved by technology

The heat source of the direct heating technology is in direct contact with the polluted soil, which has high heat transfer efficiency and large processing capacity, but produces a large amount of harmful gas that needs further treatment; the heat source of the indirect heating technology does not directly contact the polluted material, and the heat transfer efficiency is low, but it needs to The amount of harmful gas processed is small, especially suitable for the treatment of soil contaminated by highly toxic organic substances

[0005] However, the current indirect thermal desorption technology still has the following defects: the structure of the thermal desorber is complex, the construction cost is high, and the operation is inconvenient; the heat transfer efficiency is low, and the energy utilization efficiency is low; Utilize low-taste energy

Poor adaptability to soils of different textures, prone to soil bonding during thermal desorption

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