Thermal desorption method and device for organic polluted soil on basis of cement process

Abstract

A thermal desorption method for organic polluted soil enables the polluted soil to be reversely contacted with hot wind for thermal desorption and enables volatility / semi-volatility organic matter to be separated and taken out by the hot wind, and tail gas generated during thermal desorption enters a cement kiln for burning and purification and is exhausted. The soil after thermal desorption is cooled and humidified. The invention further discloses a device for achieving the method. The thermal desorption method and the device for the organic polluted soil on the basis of cement process avoidthe shortcomings that a traditional cement kiln has low treatment capacity for burning, treatment types are limited, processed soil can not be utilized, and traditional thermal desorption tail gas treatment has high cost, improves treatment capacity of the polluted soil and tail gas purification level, reduces treatment energy consumption, and is environment-friendly repair technology which is energy-saving, high in efficiency and low in cost.

Description

technical field [0001] The invention belongs to the field of contaminated soil remediation, is applicable to volatile / semi-volatile organic contaminated soil, and more specifically relates to a method for thermal desorption and remediation of polluted soil using high-temperature calcination in cement production for tail gas treatment. [0002] The invention also relates to a device for implementing the above method. Background technique [0003] In recent years, with the adjustment of the industrial structure, many industrial enterprises in the main urban areas of many cities have been closed or relocated, leaving behind a large amount of polluted soil, including a large amount of organic polluted soil. These polluted sites must undergo soil restoration before they can be put into operation. new uses. For the remediation of organic polluted soil, thermal desorption technology is a commonly used and effective technology. It uses direct or indirect heat exchange to heat the s...

AI Technical Summary

Problems solved by technology

[0010] In this patent, incineration of the tail gas after thermal desorption at high temperature can completely remove harmful substances, but the energy consumption of the tail gas alone is high, and the treatment cost is bound to increase.

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