Thermal desorption combined utilization and waste heat recycling method and system adopted by method

Abstract

The invention discloses a thermal desorption combined utilization and waste heat recycling method and a system adopted by the method. The method comprises the following steps of (1) carrying out drying and directly thermal desorption treatment on low-concentration oil sludge or chlorine-free organic polluted soil, and carrying out cyclone dust removal treatment on generated waste gas; (2) carryingout drying and indirect thermal desorption treatment on high-concentration oil sludge or chlorine-containing organic polluted soil or mercury polluted soil, and sequentially carrying out condensationand oil-water separation treatment on the generated waste gas; and (3) carrying out high-temperature oxidation, two-stage heat exchange cooling treatment and tail gas treatment on the waste gas in the step (1) and the non-condensable gas in the step (2), and then discharging. The system consists of a directly-heated thermal desorption system, an indirectly-heated thermal desorption system and a tail gas purification and waste heat recycling system; pollutants are treated in a classified mode, the treatment amount is large, the treatment efficiency is high, and safety and environment friendliness are achieved; and generated waste heat is recycled to the maximum extent, energy is saved, consumption is reduced, resource recovery is achieved while pollution treatment is achieved, and sustainable development is facilitated.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a method for combined use of thermal desorption and waste heat recovery and utilization and a system thereof. Background technique [0002] In recent years, for the treatment of organic contaminated soil, thermal desorption technology has obvious advantages in terms of remediation cycle and remediation effect, and has gradually been popularized and applied in the field of soil remediation. At present, the development of thermal desorption technology at home and abroad is quite mature, and an industrial chain of thermal desorption technology has been formed. Thermal desorption equipment can be divided into direct thermal desorption and indirect thermal desorption according to the heating method. The difference between the two is mainly in the heating system and the tail gas treatment system. After entering the thermal rotary kiln, the polluted soil with direct thermal de...

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Problems solved by technology

The direct thermal desorption system has the characteristics of high thermal efficiency and large processing capacity, but it also has the disadvantages of large dust production and high safety hazards.

The flame generated by the indirect thermal desorption burner evenly heats the outside of the rotary kiln. After the polluted soil is indirectly heated to the boiling point of the pollutant, the pollutant is separated from the soil, and the exhaust gas is directly discharged through combustion, which has the advantages of less dust production and low safety hazards. , resource recovery and other advantages, but there are also some disadvantages, such as low thermal efficiency, small processing capacity, etc.

[0003] The two kinds of thermal desorption have their own advantages and disadvantages, but they are complementary. However, currently on the market and in projects, some kind of thermal desorption system is used alone. It has not been found that the combination of the two technologies can be used in conjunction with the high temperature oxidation chamber. A report on the method and related equipment for recycling the heat

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