Heating unit, heating method and application of continuous direct thermal desorption repair system

Abstract

The invention relates to a heating unit, a heating method and application of a continuous direct thermal desorption remediation system, and belongs to the field of contaminated soil remediation, combustion nozzles are arranged on a motion path of soil at intervals to perform segmented heating on the soil, the fuel utilization efficiency is higher, the fuel consumption is less, and the economical efficiency is good. And on the heating path, the soil is in direct contact with flame of the combustor, and the heat exchange efficiency is higher. Soil is driven by the disc to do circular motion, the materials are overturned by the rake plow, disturbance to the materials is very low, and raised dust is basically not generated. Compared with existing direct thermal desorption, the tail gas treatment device is simpler in design, low in manufacturing cost, good in treatment effect and low in energy consumption, and cyclone dust removal equipment, cloth bag dust removal equipment and the like do not need to be installed. Due to the segmented direct flame heating mode, the heat utilization rate is high, the gas amount is small, and the tail gas treatment load is small. By changing the position of the soil guide plate on the annular sliding rail, the heating period of the soil is changed, and the whole remediation system is wider in adaptability.

Description

technical field [0001] The invention belongs to the field of contaminated soil remediation, in particular to a heating unit, a heating method and an application of a continuous direct thermal desorption remediation system. Background technique [0002] At present, the thermal desorption treatment devices used for polluted soil, especially polluted soil that is difficult to treat by traditional remediation processes such as polycyclic aromatic hydrocarbons, pesticides, and petroleum hydrocarbons, mainly include cement kiln, direct thermal desorption rotary kiln, and indirect thermal desorption rotary kiln. (or spiral), heating stack, heating box, etc. [0003] Among them, cement kilns mainly add contaminated soil or solid waste as raw materials to raw materials during the production of cement, and achieve high-temperature degradation of pollutants in the high-temperature calcination stage. The cement kiln has high treatment efficiency and good effect, and there is no problem...

AI Technical Summary

Problems solved by technology

In order to ensure that the soil has enough heated flue gas on the heating path to achieve heat exchange, the combustion power of the burner can only be increased, which leads to a further increase in energy consumption, and the amount of flue gas after combustion is larger and mixed with pollutants and dust Afterwards, the tail gas end treatment load will increase sharply, resulting in an increase in end treatment energy consumption, and the economy is poor

[0006] (2) Since the soil turns up and down with the rotation of the kiln body inside the rotary kiln, and the kiln head heater has a large amount of flue gas, a large amount of dust will be generated under the dual effects of mechanical agitation and gas purging. Pollutants and water vapor enter the back-end tail gas treatment device together, which increases the difficulty of the end gas treatment device, complicates the equipment design of the tail gas treatment device, and puts forward higher requirements for the connection of the tail gas unit.

In addition, because the soil is turned up and down all the time inside the kiln body, the soil cannot be in uniform contact with the flame, resulting in low heat utilization efficiency.

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