Rotary kiln thermal desorption device capable of uniformly heating materials

Abstract

The invention relates to the soil remediation industry in the field of environmental protection, in particular to a rotary kiln thermal desorption device capable of uniformly heating materials. The rotary kiln thermal desorption device is composed of fixed section kiln bodies, rotary section kiln bodies, combustor devices, supporting roller devices, kiln body heat preservation devices and sealingdevices; a rotary kiln for thermal desorption treatment is divided into a plurality of sections in the length direction according to the requirement of the treatment capacity, and the device is formedby combining the two structures, namely the rotary section kiln bodies and the fixed section kiln bodies in an alternated mode; the rotary section kiln bodies adopt the design structure of a conventional rotary kiln; one or more combustor devices are arranged on the fixed section kiln bodies and are used for heating the materials in the kiln; sealing between the rotary section kiln bodies and thefixed section kiln bodies adopts a double-sealing mode of sealing hoop plates and labyrinth heat preservation devices. According to the rotary kiln thermal desorption device, the nonuniformity of thetemperature among the materials in the kiln can be maximally reduced, and high-efficiency purification and remediation of contaminated soil can be completed efficiently.

Description

technical field [0001] The invention relates to the soil restoration industry in the field of environmental protection, and is a rotary kiln thermal desorption device suitable for an ex-situ direct thermal desorption restoration process. Background technique [0002] The ex-situ direct thermal desorption remediation process is an effective method for remediation of organically polluted soil. Its basic principle is: through heating, the pollutants in the material (contaminated soil) are released from the soil surface or pores in the gas phase form of volatile components. desorbed out. The difference between thermal desorption repair process and incineration disposal is: (1) The combustion temperature required for incineration disposal is at least 850°C; (2) The thermal desorption temperature only needs to reach the thermal volatilization temperature of the pollutant itself or slightly higher Just a few. At present, the thermal volatilization temperature of the organic pollu...

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Problems solved by technology

[0005] The invention solves the problem of poor temperature uniformity of materials in the kiln at various time points to the greatest extent, and makes volatile organic compounds, semi-volatile organic compounds, chlorinated phenols, dioxins / furans, petroleum, mercury and other pollutants in the soil free from Quickly separate from the soil, and efficiently complete the purification and restoration of polluted soil

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