Contaminated soil thermal desorption system capable of efficiently recycling waste heat and method adopting contaminated soil thermal desorption system

Abstract

The invention discloses a contaminated soil thermal desorption system capable of efficiently recycling waste heat. The contaminated soil thermal desorption system comprises a soil thermal desorption system and a tail gas incineration system, wherein a part of high temperature flue gas generated by the tail gas incineration system is discharged through one of flue gas outlets, and the other part of the high temperature flue gas is mixed with air, and then fed to the soil thermal desorption system to be used as a heat source gas. The contaminated soil thermal desorption system disclosed by the invention gives full play to the advantages of the thermal desorption technology for restoring the soil contaminated by organics, sufficiently utilizes the heat in the high temperature flue gas generated by incineration of the thermal desorbed tail gas in combination with the structure of a flue gas furnace, and shunts a part of the high temperature flue gas to be mixed with fresh cool air as the heat source gas which is fed to a rotary kiln reactor as the heat source gas for heating the soil, so as to eliminate the arrangement of a separate burner of the rotary kiln structurally.

Description

technical field [0001] The invention relates to the field of soil remediation, in particular to a thermal desorption system for polluted soil with high-efficiency reuse of waste heat. Background technique [0002] Thermal desorption technology is an important contaminated soil remediation technology, which can remediate the soil that has been polluted by organic matter, and can achieve good remediation effect. It uses heating to heat the soil polluted by organic matter to above the boiling point of the organic matter, so that the organic matter adsorbed in the soil is volatilized into a gaseous state and then separated. Thermal desorption technology can effectively remove volatile organic compounds, such as aromatic hydrocarbons, etc., and can also effectively remove non-volatile and refractory organic pollutants such as PCBs, DDT, dioxins, and chlorine-containing pesticides. Organic substances with different boiling points can be heated at one time to achieve the restorati...

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Problems solved by technology

The commonly used waste heat utilization system is an air-air heat exchanger or an air-water heat exchanger followed by a waste heat boiler. Not only is the equipment complex, but the heat loss during the heat exchange is also a great waste, and it is not easy to control. The hot air after heat exchange is very expensive. It is difficult to meet the temperature and air volume required for soil thermal desorption

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