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Heat transfer strengthened external heat rotary type organic polluted soil thermal desorption device

An external heat rotary type, organic pollution technology, applied in the field of soil remediation of polluted sites, can solve the problems of complex system, large area, adhesion and other problems

Active Publication Date: 2019-04-05
NANJING UNIV OF TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patents CN201721127402.3 and CN201621177931.X have invented a thermal spiral reactor with indirect heat exchange, some of which also use an externally heated auger thermal desorption machine as its core component, because this externally heated auger thermal desorption machine For materials with high water content and high oil content, there is often a sticking problem, and the thermal efficiency is very low. Due to the limitation of the structure of the heating screw itself, the processing capacity of the single machine is low, generally 1.5t / h, when a larger processing capacity is required In this case, multiple machines can only be connected in parallel, the system is complex and occupies a large area, and because the thermal desorption device usually needs to be movable and quickly assembled, the number of parallel series is limited, usually no more than two, and the disposal capacity of a single set of equipment does not exceed 3t / h

Method used

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  • Heat transfer strengthened external heat rotary type organic polluted soil thermal desorption device
  • Heat transfer strengthened external heat rotary type organic polluted soil thermal desorption device
  • Heat transfer strengthened external heat rotary type organic polluted soil thermal desorption device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] The above-mentioned device is used to treat organic pollutants, and its specific parameter conditions are shown in Table 1.

[0082] Processing object:

[0083] Moisture content 20%, toluene, xylene volatile organic pollution soil

[0084] Processing parameters:

[0085] When the temperature of the flue gas inlet (16) inside the cylinder is 650°C, the temperature of the flue gas inlet (14) outside the cylinder is 700°C, and the soil residence time is 30 minutes, the temperature of the flue gas outlet (12) inside the cylinder is 220°C, and the temperature of the flue gas outlet (13) outside the cylinder is 220°C. ) temperature is 260°C, the treatment capacity is 7.4t / h, the initial average concentration of toluene and xylene is 500mg / kg, the average concentration after treatment is lower than 5.0mg / kg, the removal rate has reached 99%, and the average heating per ton of soil Consumption 40Nm 3 / h natural gas;

[0086] The temperature of the flue gas inlet (16) inside...

Embodiment 2

[0088] The above-mentioned device is used to treat organic pollutants, and its specific parameter conditions are shown in Table 1.

[0089] With a moisture content of 20%, semi-volatile organic polluted soil by HCH and DDTs pesticides

[0090] Processing parameters:

[0091] The temperature of the flue gas inlet (16) inside the cylinder is 700°C, the temperature of the flue gas inlet (14) outside the cylinder is 750°C, and when the soil residence time is 30 minutes, the temperature of the flue gas outlet (12) inside the cylinder is 260°C, and the temperature of the flue gas outlet (13) outside the cylinder is 260°C. ) temperature is 300°C, the treatment capacity is 7.4t / h, the initial average concentration of HC6 and DDTs is 300mg / kg, the average concentration after treatment is lower than 6.0mg / kg, the removal rate has reached 98%, and the average heating per ton Soil consumption 45Nm3 / h natural gas;

[0092] The temperature of the flue gas inlet (16) inside the cylinder i...

Embodiment 3

[0094] The above-mentioned device is used to treat organic pollutants, and its specific parameter conditions are shown in Table 1.

[0095] Moisture content 20%, benzanthracene, benzopyrene polycyclic aromatic hydrocarbons hardly volatile organic pollution soil

[0096] Processing parameters:

[0097] The temperature of the flue gas inlet (16) inside the cylinder is 750°C, the temperature of the flue gas inlet (14) outside the cylinder is 800°C, and the soil residence time is 30 minutes, the temperature of the flue gas outlet (12) inside the cylinder is 300°C, and the temperature of the flue gas outlet (13) outside the cylinder is 300°C. ) temperature is 340°C, the treatment capacity is 7.4t / h, the initial average concentration of benzoanthracene and benzopyrene is 100mg / kg, the average concentration after treatment is lower than 2.0mg / kg, the removal rate has reached 98%, and the average heating Consumption of 50Nm per ton of soil 3 / h natural gas;

[0098] The temperature...

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Abstract

The invention discloses a heat transfer strengthened external heat rotary type organic polluted soil thermal desorption device and belongs to the technical field of polluted soil restoration. The heattransfer strengthened external heat rotary type organic polluted soil thermal desorption device comprises a raw soil feeding device, a rotary external heat type reactor and a purified soil discharging device. The heat transfer strengthened external heat rotary type organic polluted soil thermal desorption device can achieve larger processing capacity and a smaller processing area under the condition of identical unit processing energy consumption.

Description

technical field [0001] The invention belongs to the technical field of soil remediation of polluted sites, is applicable to the remediation of soil in organic polluted sites, and specifically relates to an external heat rotary type thermal desorption device for organic polluted soils with enhanced heat transfer. Background technique [0002] Soil refers to the loose surface layer on the land surface that is fertile and capable of growing plants. When too many harmful substances discharged into the soil exceed the self-purification capacity of the soil, the composition, structure and function of the soil will change, and microbial activities will be inhibited. Harmful substances or Its decomposition products gradually accumulate in the soil through "soil → plant → human body", or are indirectly absorbed by the human body through "soil → water → human body", reaching the level of endangering human health, and soil pollution occurs. [0003] China is one of the countries with t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/06
CPCB09C1/06
Inventor 徐海涛张胜田周永贤陈纪赛陈英文王小峰张雪英张小荣章利伟邓梅
Owner NANJING UNIV OF TECH
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