Soil thermal desorption repair process and apparatus

Abstract

The invention discloses a soil thermal desorption process and apparatus. The apparatus comprises a soil pretreatment system, a rotary kiln thermal desorption system and a rotary kiln tail gas treatment system. During treatment, to-be-repaired soil is fed into an inflation shed pretreatment field to be subjected to crushing, screening and dehydration pretreatment, and the water content of the soil is controlled to be 20% or less; the soil is conveyed into a thermal desorption rotary kiln to be subjected to thermal desorption treatment under the closed environment, and the treated material is subjected to spraying humidification treatment and then fed into an inspection waiting area to be inspected; and waste gas produced by the rotary kiln is fed into a condensing tower to be condensed, the flue gas temperature is controlled to be 180 DEG C or lower, most dust is removed through a bag dust remover, the waste gas is then fed into an activated carbon absorber so that pollutants in the waste gas can be further removed and is fed into a NOx chemical absorption system so that NOx produced in the combustion process can be purified, and finally, the waste gas is extracted through an induced draft fan and exhausted into the atmosphere through a chimney after the standard is reached. According to the soil thermal desorption process, the pollutant treatment range is wide, the pollutant removal rate is high, and secondary pollution cannot be caused.

Description

Technical field [0001] The invention relates to the technical field of soil restoration, in particular to a soil thermal desorption restoration process and equipment. Background technique [0002] Soil thermal desorption technology is a kind of heat treatment technology. The research on thermal desorption of soil and sludge contaminated by organic matter in foreign countries began in the 1980s. In the United States, the proportion of organic soil remediation and disposal using thermal desorption technology accounts for more than 70%. Thermal desorption technology is in its infancy stage in my country, and there is no relevant report on a complete set of equipment and process that can handle a wide range of pollutants, high pollutant removal rate, and will not cause secondary pollution. Summary of the invention [0003] The technical problem to be solved by the present invention is to provide a soil thermal desorption repair process and equipment that has a wide range of pollutant...

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Problems solved by technology

Thermal desorption technology is just in its infancy in my country. At present, there is no related report on a complete set of equipment and technology that can handle a wide range of pollutants, high pollutant removal rate, and will not cause secondary pollution.

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