Thermal remediation system for organic matter contaminated soil through double-phase transformation heat treatment

Abstract

The invention relates to a thermal remediation system for organic matter contaminated soil through double-phase transformation heat treatment. The system comprises a feeding system, a thermal desorption system, an organic pollutant dust removal system, a combustible combustion system, a flue gas waste heat recovery system and a tail gas treatment emission system, wherein the feeding system consists of a hammer crusher communicated with an organic contaminated soil inlet, a screening machine communicated with an outlet of the hammer crusher, a conveying belt communicated with an outlet of the screening machine, and an iron remover above an outlet of the conveying belt; a soil feeding port of the thermal desorption system is connected with an outlet of a belt conveyor, a lower end outlet ofthe tail of the thermal desorption system is communicated with a steel type conveying belt, and an upper end outlet of the tail of the thermal desorption system is communicated with the organic pollutant dust removal system. Energy consumption and tail gas treatment costs are reduced, organic pollutant heat and flue gas waste heat can be recycled, fuel is saved, energy consumption is reduced, thetreatment efficiency is high, tail gas is discharged after being treated, and environmental protection is facilitated.

Description

Technical field: [0001] The invention relates to the field of energy and the environment, in particular to the field of a thermal restoration system for dual-phase transformation heat treatment of soil contaminated by organic matter. Background technique [0002] Thermal desorption is also called thermal desorption. As a non-combustion technology, it is one of the effective technologies for remediating volatile / semi-volatile organic polluted soil. Due to its wide range of treatment and remediation in different places, thermal desorption technology has been It has been successfully used in the remediation of soil contaminated by chlorine-containing organic pollutants, polycyclic aromatic hydrogen, organic pesticides, and herbicides. Tsinghua University invented a drum-type reverse direct heating equipment (ZL201010598161.7), which uses hot flue gas to directly contact the soil for heating, which improves thermal efficiency, but due to the mixing of flue gas and soil, the burd...

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Problems solved by technology

Tsinghua University invented a drum-type reverse direct heating equipment (ZL201010598161.7), which uses hot flue gas to directly contact the soil for heating, which improves thermal efficiency, but due to the mixing of flue gas and soil, the burden of tail gas treatment increases; a Contaminated soil thermal desorption repair system (CN204769860 U), this system adopts the indirect heating method of rotary kiln, which greatly reduces the amount of tail gas treatment, but the combustion system becomes complicated and difficult to operate due to the use of coal as fuel, and the separated organic pollutants If it is not utilized, resources are wasted; An environmental protection and energy-saving thermal desorption repair system for organic polluted soil (CN 203578349 U), which uses a mixture of natural gas and organic pollutants as fuel, reduces energy consumption, but separates The organic pollutants are sent to the combustion chamber for combustion without dust removal. On the one hand, it makes the tissue combustion difficult. On the other hand, the dusty flue gas easily damages the combustion chamber and its pipes, and the heat of the tail flue gas is not further recycled, which reduces the system efficiency. Thermal efficiency

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