Sectional type heating and modular thermal desorption equipment for restoring organic contaminated soil and method

Abstract

The invention relates to sectional type heating and modular thermal desorption equipment for restoring organic contaminated soil. The sectional type heating and modular thermal desorption equipment is composed of a screening device, a feeding conveying system, a low-temperature drying system, a high-temperature thermal desorption system, a discharging conveying system, a tail gas set treatment system, a heat exchange system and a control system. The feeding conveying system is connected with the low-temperature drying system, the low-temperature drying system is connected with the tail gas treatment system and the high-temperature thermal desorption system, and the high-temperature thermal desorption system is connected with the discharging conveying system. The feeding conveying system, the low-temperature drying system, the high-temperature thermal desorption system, the discharging conveying system, the heat exchange system and the tail gas set treatment system are all connected with the control system, and the whole treatment process is monitored by the control system. According to the equipment, continuous feeding can be achieved, heat can be fully utilized through sectional heating and the scientific heat exchange system, quick connecting face devices are arranged between the components of the whole equipment, and the equipment can be detached, assembled and transported fast.

Description

technical field [0001] The invention relates to the technical field of construction machinery, in particular to a device and a method for repairing organic polluted soil. Background technique [0002] In recent years, with the rapid development of industry and the continuous expansion of urbanization scale, at the same time, the unreasonable development of mineral resources and their smelting emissions have led to the continuous expansion of land pollution and the increasing degree of soil pollution. Among them, a large number of semi-volatile organic pollutants (Semi-Volatile Organic Compounds, referred to as SVOCs) require extremely high removal rates due to their high toxicity. When the concentration of pollutants reaches a certain level, conventional chemical and biological remediation methods are difficult to achieve the remediation target. Therefore, how to dispose of soil polluted by semivolatile highly toxic organic compounds has become a technical problem that need...

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Problems solved by technology

[0004] In the current prior art, when thermal desorption equipment is used to treat contaminated soil, there are many shortcomings such as low thermal energy utilization rate and frequent material blockage.

[0005] In domestic disclosed thermal desorption equipment patent documents, as disclosed in Chinese patents CN10235721A and CN201511036U, jaw crushers or vibrating screens are added as pretreatment means before feeding, but such pretreatment means cannot directly reduce soil water content rate, for cohesive soil, it may cause castables that block the conveying system and wear the inner wall of the rotary kiln, thereby greatly reducing the service life of the equipment and increasing maintenance costs

Chinese patent CN101780467A discloses an indirect thermal analysis equipment for polluted soil. The system heats between the inner structure and the outer structure through the heating system, and the thermal desorption efficiency is low, which wastes a lot of energy.

Chinese patent CN103341486A discloses an electromagnetic heat desorption system for polluted soil. The system heats the kiln body through electromagnetic heat. Compared with the thermal desorption system of gas and fuel oil, the cost is higher and the energy waste is large.

Chinese patent CN102029287A discloses a drum-type reverse thermal desorption system for organic-contaminated soil. The system uses a burner at the tail of the rotary kiln to reversely feed high-temperature air into the kiln. However, since the flow direction of the soil is opposite to the flow direction of the gas, The uniform heating time of the soil is shorter, and the waste of energy is greater than that of the forward system

At present, none of the thermal desorption / thermal analysis equipment patents published in China has a heat recovery system, resulting in a certain amount of energy waste

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