CN104438313A - Contaminated soil thermal desorption system capable of efficiently recycling waste heat and method adopting contaminated soil thermal desorption system - Google Patents

Contaminated soil thermal desorption system capable of efficiently recycling waste heat and method adopting contaminated soil thermal desorption system Download PDF

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Publication number
CN104438313A
CN104438313A CN201410677838.4A CN201410677838A CN104438313A CN 104438313 A CN104438313 A CN 104438313A CN 201410677838 A CN201410677838 A CN 201410677838A CN 104438313 A CN104438313 A CN 104438313A
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thermal desorption
soil
gas
rotary kiln
reacting
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CN201410677838.4A
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Inventor
余云飞
杨世辉
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CISDI Engineering Co Ltd
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CISDI Engineering Co Ltd
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Abstract

The invention discloses a contaminated soil thermal desorption system capable of efficiently recycling waste heat. The contaminated soil thermal desorption system comprises a soil thermal desorption system and a tail gas incineration system, wherein a part of high temperature flue gas generated by the tail gas incineration system is discharged through one of flue gas outlets, and the other part of the high temperature flue gas is mixed with air, and then fed to the soil thermal desorption system to be used as a heat source gas. The contaminated soil thermal desorption system disclosed by the invention gives full play to the advantages of the thermal desorption technology for restoring the soil contaminated by organics, sufficiently utilizes the heat in the high temperature flue gas generated by incineration of the thermal desorbed tail gas in combination with the structure of a flue gas furnace, and shunts a part of the high temperature flue gas to be mixed with fresh cool air as the heat source gas which is fed to a rotary kiln reactor as the heat source gas for heating the soil, so as to eliminate the arrangement of a separate burner of the rotary kiln structurally.

Description

The contaminated soil thermal desorption system of the efficient reuse of a kind of waste heat and method
Technical field
The present invention relates to soil remediation field, be specifically related to the contaminated soil thermal desorption system of the efficient reuse of a kind of waste heat.
Background technology
Thermal desorption technology is a kind of important contaminated soil remediation technology, to being repaired by the place soil of Organic Pollution, and can reach good repairing effect.It adopts mode of heating to be heated to more than organic boiling point by by the soil of Organic Pollution, carries out separating treatment again after making the organic matter be adsorbed in soil evaporate into gaseous state.Thermal desorption technology effectively can remove the organic matter of effumability, such as, aromatic hydrocarbon etc., also effectively can remove such as PCBs, DDT, bioxin, organic contamination soil containing the difficult volatilization such as chloro pesticide, difficult degradation, and can once heat to reach reparation target to the organic matter of multiple different boiling.
In existing thermal desorption technology, usually the method for burning is adopted to carry out harmlessness disposing for the tail gas containing organic pollution, the coal dust that uses or the fuel such as natural gas is needed in burning process, flue gas after burning has the high temperature of nearly thousand degrees Celsius, have a large amount of heats, must equipment UTILIZATION OF VESIDUAL HEAT IN equip before discharge.Conventional bootstrap system is add waste heat boiler after gas-gas heat exchanger or air-water heat exchanger, not only equipment is complicated, thermal loss in heat transfer process is also very large waste, and wayward, and the hot-air after heat exchange is difficult to meet the temperature needed for Soil Thermal desorption and tolerance.
Summary of the invention
In view of this, an object of the present invention is to provide the contaminated soil thermal desorption system of the efficient reuse of a kind of waste heat, the present invention gives full play to the advantage of thermal desorption technology in repairing organic polluted soil process, in conjunction with the structure of combustion gas furnace, make full use of the heat in the rear high-temperature flue gas of thermal desorption tail gas burning, mixing with fresh cold air after distributing a part of high-temperature flue gas passes in reacting in rotary kiln device as thermal source gas, as the thermal source gas of heating soil, therefore decrease the setting of the independent burner of rotary kiln from structure; Meanwhile the present invention also provides a kind of method utilizing aforementioned desorption system to carry out Soil Thermal desorption.
An object of the present invention is achieved through the following technical solutions, the contaminated soil thermal desorption system of the efficient reuse of a kind of waste heat, comprise Soil Thermal desorption system, tail gas CIU, the high-temperature flue gas that described tail gas CIU produces a wherein part, through the discharge of one of them flue gas gas outlet, enters into Soil Thermal desorption system as thermal source gas after another part mixes with air.
Further, described Soil Thermal desorption system comprises soil feed arrangement, Soil Thermal desorption apparatus, soil drawing mechanism, and three is linked in sequence, and described Soil Thermal desorption apparatus is connected with tail gas CIU.
Further, described Soil Thermal desorption apparatus is internal heat type thermal desorption reacting in rotary kiln device, described soil feed arrangement is connected with the feeding mouth of internal heat type thermal desorption reacting in rotary kiln device, and the discharging opening of internal heat type thermal desorption reacting in rotary kiln device is connected with soil drawing mechanism.
Further, described internal heat type thermal desorption reacting in rotary kiln device is placed with 0.01 ~ 0.03 gradient.
Further, described tail gas CIU comprises cyclone dust collectors, flue gas incineration furnace, spray cooling tower and activated carbon adsorber; The gas outlet of internal heat type thermal desorption reacting in rotary kiln device, cyclone dust collectors, flue gas incineration furnace, spray cooling tower are connected successively with activated carbon adsorber; Dust mouth at the bottom of described cyclone dust collectors is connected with described soil drawing mechanism.
Further, described flue gas incineration furnace comprises combustion chamber and gas distributing chamber, and described combustion chamber is connected with gas distributing chamber, and described combustion chamber is furnished with fuel igniter and air compensating jet, the high-temperature flue gas part that combustion chamber produces enters gas distributing chamber, and remainder enters spray cooling tower; Described gas distributing chamber be used for air mix with high-temperature flue gas and mist as the thermal source gas of internal heat type thermal desorption reacting in rotary kiln device, the outlet side of described gas distributing chamber is connected with the air inlet of described internal heat type thermal desorption reacting in rotary kiln device.
Further, the discharging opening of described soil drawing mechanism is spiral discharging mouth.
Two of object of the present invention is achieved through the following technical solutions, and a kind of contaminated soil desorption method, comprises the following steps:
Step 1: polluted soil, after sieving approach pretreatment, removes wherein stone or metal pulverize soil to below 5cm;
Step 2: feed through the feeding mouth of pretreated soil from reacting in rotary kiln device, makes contaminated soil carry out thermal desorption along the cylindrical shell continuous rolling of reacting in rotary kiln device;
Step 3: the organic material contaminated soil after thermal desorption enters soil drawing mechanism from the discharging opening of reacting in rotary kiln device, discharges after cooling damping;
Step 4: the organic exhaust gas that reacting in rotary kiln device produces is transported to cyclone dust collectors by the gas outlet of reacting in rotary kiln device and carries out dedusting, flue gas after dedusting passes in flue gas incineration furnace combustion chamber and carries out second-time burning, and the dust that deduster is collected enters soil adjuster cooling discharge;
Step 5: through the organic exhaust gas part of second-time burning by forming the high-temperature gas of the certain tolerance of uniform temperature after mixing with certain proportion fresh air in gas distributing chamber, enter heating soil in reacting in rotary kiln device as thermal source gas by the air inlet of reacting in rotary kiln device; Another part high-temperature flue gas is drained in air by spray cooling tower, activated carbon adsorber successively by exhaust combustion chamber pipe.
Owing to have employed technique scheme, the present invention has following advantage:
1, the high-temperature flue gas after burning is shunted, a part produces the thermal source gas needed for thermal desorption process after mixing with fresh cold air, the temperature of this part gas and tolerance can realize controlling simultaneously, and simultaneously the atmosphere of its hypoxemia inhibits thermal desorption to cross the generation risk of the noxious materials such as bioxin in journey to a certain extent;
2, the generation of the pernicious gases such as NOx can be suppressed after thermal desorption tail gas enters flue gas incineration furnace by the magnitude of recruitment controlling oxygen;
3, the heat source system of thermal desorption is combined with thermal desorption tail gas incineration disposal system, saves fuel, reduce energy consumption;
4, the high temperature soil of thermal desorption discharges after soil spiral discharging mouth cooling damping, can not cause dust pollution.
Accompanying drawing explanation
In order to make the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail, wherein:
Fig. 1 is theory diagram of the present invention;
Fig. 2 is the process chart of thermal desorption method.
Detailed description of the invention
Below with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail; Should be appreciated that preferred embodiment only in order to the present invention is described, instead of in order to limit the scope of the invention.
As shown in Figure 1, the contaminated soil thermal desorption system of the efficient reuse of a kind of waste heat, comprise Soil Thermal desorption system, tail gas CIU, the high-temperature flue gas that described tail gas CIU produces a wherein part, through the discharge of one of them flue gas gas outlet, enters into Soil Thermal desorption system as thermal source gas after another part mixes with air.
High-temperature flue gas after burning is shunted with novel by this, a part produces the thermal source gas of thermal desorption after mixing with fresh cold air, temperature and the tolerance of this part gas all easily control, and simultaneously the atmosphere of its hypoxemia inhibits thermal desorption to cross the generation risk of the noxious materials such as bioxin in journey to a certain extent.
In the present embodiment, being the shunt ratio by regulating the splitter position of flue gas incineration furnace gas outlet to control high-temperature flue gas as the temperature of the mist of thermal source gas and tolerance, the air capacity passed in gas distributing chamber can being regulated to reach simultaneously.Due to Organic Pollution not of the same race soil needed for thermal desorption operating parameter (mainly refer to desorption temperature and the time of staying) different, therefore the accurate control of thermal source gas is very necessary to control thermal desorption process.
Described Soil Thermal desorption system comprises soil feed arrangement, Soil Thermal desorption apparatus, soil drawing mechanism, and three is linked in sequence, and described Soil Thermal desorption apparatus is connected with tail gas CIU.Described Soil Thermal desorption apparatus is internal heat type thermal desorption reacting in rotary kiln device, and described soil feed arrangement is connected with the feeding mouth of internal heat type thermal desorption reacting in rotary kiln device, and the discharging opening of internal heat type thermal desorption reacting in rotary kiln device is connected with soil drawing mechanism.Described tail gas CIU comprises cyclone dust collectors, flue gas incineration furnace, spray cooling tower and activated carbon adsorber; The gas outlet of internal heat type thermal desorption reacting in rotary kiln device, cyclone dust collectors, flue gas incineration furnace, spray cooling tower are connected successively with activated carbon adsorber; Dust mouth at the bottom of described cyclone dust collectors is connected with described soil drawing mechanism.Described flue gas incineration furnace comprises combustion chamber and gas distributing chamber, described combustion chamber is connected with gas distributing chamber, described combustion chamber is furnished with fuel igniter and air compensating jet, and the high-temperature flue gas part that combustion chamber produces enters gas distributing chamber, and remainder enters spray cooling tower; Described gas distributing chamber be used for air mix with high-temperature flue gas and mist as the thermal source gas of internal heat type thermal desorption reacting in rotary kiln device, the outlet side of described gas distributing chamber is connected with the air inlet of described internal heat type thermal desorption reacting in rotary kiln device.
As shown in Figure 2, soil enters in reacting in rotary kiln device and carries out thermal desorption process after the screening of soil feed arrangement, broken pretreatment, and after thermal desorption, clean soil is discharged via soil spiral discharging machine cooling damping.Thermal desorption tail gas wherein a part successively by discharging after cyclone dust collectors, flue gas incineration furnace, spray cooling tower and activated carbon adsorber, produce the high-temperature flue gas of certain flow uniform temperature after another part tail gas mixes with air in gas distributing chamber, this flue gas can be used as the thermal source gas of Soil Thermal desorption reacting in rotary kiln device.
In the present embodiment, the discharging opening of described soil drawing mechanism is spiral discharging mouth, and the high temperature soil of thermal desorption discharges after soil spiral discharging mouth cooling damping, can not cause dust pollution.
In the present embodiment, described internal heat type thermal desorption reacting in rotary kiln device is placed with 0.01 ~ 0.03 gradient.
According to above-mentioned thermal desorption device, the present invention also provides a kind of contaminated soil thermal desorption method, comprises the following steps:
Step 1: polluted soil, after sieving approach pretreatment, removes wherein stone or metal pulverize soil to below 5cm;
Step 2: feed through the feeding mouth of pretreated soil from reacting in rotary kiln device, makes contaminated soil carry out thermal desorption along the cylindrical shell continuous rolling of reacting in rotary kiln device;
Step 3: the organic material contaminated soil after thermal desorption enters soil drawing mechanism from the discharging opening of reacting in rotary kiln device, discharges after cooling damping;
Step 4: the organic exhaust gas that reacting in rotary kiln device produces is transported to cyclone dust collectors by the gas outlet of reacting in rotary kiln device and carries out dedusting, flue gas after dedusting passes in flue gas incineration furnace combustion chamber and carries out second-time burning, and the dust that deduster is collected enters soil adjuster cooling discharge;
Step 5: through the organic exhaust gas part of second-time burning by forming the high-temperature gas of the certain tolerance of uniform temperature after mixing with certain proportion fresh air in gas distributing chamber, enter heating soil in reacting in rotary kiln device as thermal source gas by the air inlet of reacting in rotary kiln device; Another part high-temperature flue gas is drained in air by spray cooling tower, activated carbon adsorber successively by exhaust combustion chamber pipe.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.

Claims (8)

1. the contaminated soil thermal desorption system of the efficient reuse of waste heat, comprise Soil Thermal desorption system, tail gas CIU, it is characterized in that: the high-temperature flue gas that described tail gas CIU produces a wherein part, through the discharge of one of them flue gas gas outlet, enters into Soil Thermal desorption system as thermal source gas after another part mixes with air.
2. the contaminated soil thermal desorption system of the efficient reuse of waste heat according to claim 1, it is characterized in that: described Soil Thermal desorption system comprises soil feed arrangement, Soil Thermal desorption apparatus, soil drawing mechanism, three is linked in sequence, and described Soil Thermal desorption apparatus is connected with tail gas CIU.
3. the contaminated soil thermal desorption system of the efficient reuse of waste heat according to claim 2, it is characterized in that: described Soil Thermal desorption apparatus is internal heat type thermal desorption reacting in rotary kiln device, described soil feed arrangement is connected with the feeding mouth of internal heat type thermal desorption reacting in rotary kiln device, and the discharging opening of internal heat type thermal desorption reacting in rotary kiln device is connected with soil drawing mechanism.
4. the contaminated soil thermal desorption system of the efficient reuse of waste heat according to claim 3, is characterized in that: described internal heat type thermal desorption reacting in rotary kiln device is placed with 0.01 ~ 0.03 gradient.
5. the contaminated soil thermal desorption system of the efficient reuse of waste heat according to claim 3, is characterized in that: described tail gas CIU comprises cyclone dust collectors, flue gas incineration furnace, spray cooling tower and activated carbon adsorber; The gas outlet of internal heat type thermal desorption reacting in rotary kiln device, cyclone dust collectors, flue gas incineration furnace, spray cooling tower are connected successively with activated carbon adsorber; The dust mouth of described cyclone dust collectors is connected with described soil drawing mechanism.
6. the contaminated soil thermal desorption system of the efficient reuse of waste heat according to claim 5, it is characterized in that: described flue gas incineration furnace comprises combustion chamber and gas distributing chamber, described combustion chamber is connected with gas distributing chamber, described combustion chamber is furnished with fuel igniter and air compensating jet, the high-temperature flue gas part that combustion chamber produces enters gas distributing chamber, and remainder enters spray cooling tower; Described gas distributing chamber be used for air mix with high-temperature flue gas and mist as the thermal source gas of internal heat type thermal desorption reacting in rotary kiln device, the gas outlet of described gas distributing chamber is connected with the air inlet of described internal heat type thermal desorption reacting in rotary kiln device.
7. the contaminated soil thermal desorption system of the efficient reuse of waste heat according to claim 2, is characterized in that: the discharging opening of described soil drawing mechanism is spiral discharging mouth.
8. utilize the contaminated soil thermal desorption system of the efficient reuse of the waste heat described in claim 6 to carry out the method for thermal desorption, it is characterized in that, comprise the following steps:
Step 1: polluted soil, after sieving approach pretreatment, removes wherein stone or metal pulverize soil to below 5cm;
Step 2: feed through the feeding mouth of pretreated soil from reacting in rotary kiln device, makes contaminated soil carry out thermal desorption along the cylindrical shell continuous rolling of reacting in rotary kiln device;
Step 3: the clean soil after thermal desorption enters soil drawing mechanism from the discharging opening of reacting in rotary kiln device, discharges after cooling damping;
Step 4: the organic exhaust gas that reacting in rotary kiln device produces is transported to cyclone dust collectors by the gas outlet of reacting in rotary kiln device and carries out dedusting, flue gas after dedusting passes in flue gas incineration furnace combustion chamber and carries out second-time burning, and the dust that deduster is collected enters soil adjuster cooling discharge;
Step 5: through the organic exhaust gas part of second-time burning by forming the high-temperature gas of the certain tolerance of uniform temperature after mixing with certain proportion fresh air in gas distributing chamber, enter heating soil in reacting in rotary kiln device as thermal source gas by the air inlet of reacting in rotary kiln device; Another part high-temperature flue gas is drained in air by spray cooling tower, activated carbon adsorber successively by exhaust combustion chamber pipe.
CN201410677838.4A 2014-11-21 2014-11-21 Contaminated soil thermal desorption system capable of efficiently recycling waste heat and method adopting contaminated soil thermal desorption system Pending CN104438313A (en)

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CN104874593A (en) * 2015-05-19 2015-09-02 北京鼎实环境工程有限公司 Method and device for treating organic polluted soil by two-section-type indirect thermal desorption technology
CN105080957A (en) * 2015-09-18 2015-11-25 中国科学院武汉岩土力学研究所 Afterheat-recycled contaminated soil thermal desorption repair system
CN105170634A (en) * 2015-08-20 2015-12-23 凯天环保科技股份有限公司 Remediation device for halohydrocarbon contaminated soil
CN105382024A (en) * 2015-11-05 2016-03-09 东南大学 Ex-situ soil thermal desorption device
CN106040724A (en) * 2016-07-27 2016-10-26 沈阳环境科学研究院 Solid waste thermal desorption module type emergency treatment device
CN106040731A (en) * 2016-08-16 2016-10-26 南京格洛特环境工程股份有限公司 Organic pollution soil restoration method
CN107036107A (en) * 2016-02-04 2017-08-11 北京建工环境修复股份有限公司 Organic waste gas treatment device and organic waste gas treatment method
CN107030100A (en) * 2016-02-04 2017-08-11 北京建工环境修复股份有限公司 Thermal desorption system and thermal desorption method
CN107931320A (en) * 2017-11-16 2018-04-20 葛洲坝中固科技股份有限公司 A kind of environment-friendly type organic polluted soil thermal desorption repair system
CN110238181A (en) * 2018-03-07 2019-09-17 中石化广州工程有限公司 The Thermal desorption restorative procedure of the soil containing chlorine pollution
CN110548759A (en) * 2019-08-30 2019-12-10 湖南恒凯环保科技投资有限公司 rotary thermal desorption kiln, device and process for thermal desorption of organic contaminated soil

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Publication number Priority date Publication date Assignee Title
CN104874593A (en) * 2015-05-19 2015-09-02 北京鼎实环境工程有限公司 Method and device for treating organic polluted soil by two-section-type indirect thermal desorption technology
CN105170634A (en) * 2015-08-20 2015-12-23 凯天环保科技股份有限公司 Remediation device for halohydrocarbon contaminated soil
CN105170634B (en) * 2015-08-20 2017-09-15 航天凯天环保科技股份有限公司 A kind of contaminated with halogenated hydrocarbons soil restoring device
CN105080957A (en) * 2015-09-18 2015-11-25 中国科学院武汉岩土力学研究所 Afterheat-recycled contaminated soil thermal desorption repair system
CN105382024A (en) * 2015-11-05 2016-03-09 东南大学 Ex-situ soil thermal desorption device
CN105382024B (en) * 2015-11-05 2018-03-20 东南大学 A kind of dystopy soil thermal desorption device
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CN107931320A (en) * 2017-11-16 2018-04-20 葛洲坝中固科技股份有限公司 A kind of environment-friendly type organic polluted soil thermal desorption repair system
CN107931320B (en) * 2017-11-16 2020-12-25 葛洲坝中固科技股份有限公司 Environment-friendly organic contaminated soil thermal desorption repair system
CN110238181A (en) * 2018-03-07 2019-09-17 中石化广州工程有限公司 The Thermal desorption restorative procedure of the soil containing chlorine pollution
CN110548759A (en) * 2019-08-30 2019-12-10 湖南恒凯环保科技投资有限公司 rotary thermal desorption kiln, device and process for thermal desorption of organic contaminated soil

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