Roller-type reverse thermal desorption system for soil polluted by organic matters

Abstract

The invention relates to a roller-type reverse thermal desorption system for soil polluted by organic matters. The roller-type reverse thermal desorption system comprises a soil feeding system, wherein the soil feeding system and a heat source system are connected with a reverse thermal desorption system; the reverse thermal desorption system is connected with a dust removing system, a cooling system and an active carbon adsorption system in turn; and control ends of the soil feeding system, the heat source system, the reverse thermal desorption system, the dust removing system, the cooling system and the active carbon adsorption system are connected with a control system. In the roller-type reverse thermal desorption system, hot air is fed into a reverse thermal desorption roller by an ignition system, and polluted soil is fed into the reverse thermal desorption roller by a soil transferring device, wherein the hot air contacts the soil reversely, so that organic pollutants containedin the soil are heated and volatilized; the purified soil is used as backfill soil; and the volatilized tail gas is dedusted by a cyclone dust extractor and an adsorption dust extractor after passingthrough an induced draft fan, and the dedusted volatilized tail gas is absorbed by a honeycomb-shaped active carbon tower after passing through an atomization cooling tower and a dial plate cooling device, and finally is discharged by a tail gas exhaust device on the basis of meeting the national standard. Materials can be fed into the roller-type reverse thermal desorption system continuously and can be heated directly; and the hot air and the polluted soil are fully mixed, and the roller-type reverse thermal desorption system has high thermal desorption efficiency.

Description

technical field [0001] The invention belongs to the field of soil remediation, and in particular relates to a drum-type reverse thermal desorption system for organic matter polluted soil. Background technique [0002] With the adjustment of industrial structure and the in-depth implementation of the "Stockholm Convention on Persistent Organic Pollutants (POPs)", a large number of high-polluting enterprises such as pesticide factories, steel factories and chemical factories, especially POPs production and use enterprises will gradually 86,000 enterprises have been shut down or relocated, among which 86,000 enterprises have been shut down or relocated across the country from 2001 to 2007, resulting in a large amount of high-pollution risk soil. The danger of soil pollution is that after some organic matter pollutes the soil, it will further pollute the air and water around the soil, while some organic matter or heavy metal pollution will pass through the food chain and have ad...

AI Technical Summary

Problems solved by technology

Although there are some thermal desorption processes and equipment reports in my country at present, they all have deficiencies: the off-site treatment process and device for volatile and semi-volatile organic compound polluted soil (ZL200410056888.7) announced a volatile and semi-volatile organic compound The off-site treatment process and device of organic polluted soil, this patent cannot realize continuous feeding; indirect thermal analysis equipment (CN101780467A) announced an indirect thermal analysis equipment for contaminated soil, the core device of the patent is a heating rotary kiln composed of an inner layer structure and The structure of the outer layer, the heating and combustion system heats between the inner layer structure and the outer layer structure, and the thermal desorption efficiency is low; the direct thermal desorption equipment (CN101712042A) announced a direct thermal desorption (thermal desorption) device for polluted soil, The tail gas is treated by incineration, which has the risk of producing dioxins; Soil Pollution Thermal Desorption Remediation Treatment System (CN101530858A) discloses a direct thermal desorption (thermal desorption) device for polluted soil, in which hot air contacts the polluted soil in the same direction , cannot achieve sufficient mixing of hot air and polluted soil, and the thermal desorption efficiency is low

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