CN108500046A - Contaminated soil thermal desorption device and its method for reducing dioxin generation - Google Patents
Contaminated soil thermal desorption device and its method for reducing dioxin generation Download PDFInfo
- Publication number
- CN108500046A CN108500046A CN201810438323.7A CN201810438323A CN108500046A CN 108500046 A CN108500046 A CN 108500046A CN 201810438323 A CN201810438323 A CN 201810438323A CN 108500046 A CN108500046 A CN 108500046A
- Authority
- CN
- China
- Prior art keywords
- thermal desorption
- contaminated soil
- nitrogen
- dioxin
- air gun
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000003795 desorption Methods 0.000 title claims abstract description 61
- 239000002689 soil Substances 0.000 title claims abstract description 57
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 79
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 39
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000001301 oxygen Substances 0.000 claims abstract description 16
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 10
- 230000015556 catabolic process Effects 0.000 claims abstract description 5
- 238000006731 degradation reaction Methods 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 230000008676 import Effects 0.000 claims abstract description 4
- 239000002918 waste heat Substances 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims 1
- 238000004321 preservation Methods 0.000 claims 1
- 239000012298 atmosphere Substances 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 238000005755 formation reaction Methods 0.000 description 8
- 239000000428 dust Substances 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 239000012299 nitrogen atmosphere Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 208000031320 Teratogenesis Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000004925 denaturation Methods 0.000 description 1
- 230000036425 denaturation Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 230000002688 persistence Effects 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000012495 reaction gas Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002680 soil gas Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/06—Reclamation of contaminated soil thermally
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/06—Reclamation of contaminated soil thermally
- B09C1/065—Reclamation of contaminated soil thermally by pyrolysis
Abstract
The present invention provides a kind of contaminated soil thermal desorption device and its reduces the method that dioxin generates, the generation of dioxin during reducing contaminated soil thermal desorption by reducing the oxygen content of reaction atmosphere.Nitrogen air accumulator is connected by pipeline with the import of heat-exchange tube, and heat-exchange tube is arranged in chilling tower middle and lower part region；The outlet of heat-exchange tube is connected with air gun, and air gun stretches to the dioxin formation zone in thermal desorption rotary kiln, and divergent nozzle is equipped on air gun, and divergent nozzle is located at the top of contaminated soil in thermal desorption rotary kiln.The nitrogen that nitrogen air accumulator provides enters heat-exchange tube, is heated to the nitrogen for entering thermal desorption rotary kiln with the waste heat of chilling tower, ensures the temperature close into kiln nitrogen and contaminated soil；Contaminated soil surface of the nitrogen after the divergent nozzle on air gun is equably sprayed onto heating, reduces the oxygen content of dioxin formation zone, reduces the production quantity of dioxin, even existing dioxin in pollution degradation soil.
Description
Technical field
The present invention relates to a kind of contaminated soil thermal desorption device and its methods for reducing dioxin generation.
Background technology
Dioxin is a kind of persistence organic pollutant of generally existing in environment, have extremely strong carcinogenic, teratogenesis, cause it is prominent
Denaturation, to the great harm of human health.Dioxin mainly by de novo formation react generate, and the reaction need to have carbon, hydrogen,
Oxygen and chlorine, and could occur under certain temperature action.Contaminated soil contains the raw material needed for dioxin de novo formation, therefore
It carries out that when thermal desorption dioxin can be generated in 250-600 DEG C of temperature range, increases dioxin concentration in flue gas and soil, bring
Secondary pollution.
Contaminated soil thermal desorption device is to pass through direct or indirect heat exchange under vacuum or when being passed through carrier gas, will
Organic pollution in soil is heated to enough temperature, so that organic pollution is able to volatilize or detach from pollution medium,
Into gas handling system, as shown in the Chinese patent application No. is 201711140822.X.Due to contaminated soil constituent
And thermal desorption temperature can not change, therefore seem particularly heavy to the regulation and control reduction dioxin generation of thermal desorption atmosphere progress part
It wants.Studies have found that flying dust reacts 30 minutes almost without dioxin generation for 300 DEG C in a nitrogen atmosphere.When oxygen-containing 10%
Nitrogen is larger by dioxin production quantity when flying dust progress identical experiment, and with oxygen content（0-10%）Increase dioxin
Production quantity increase.Dioxin can be degraded when research also shows to heat flying dust under nitrogen atmosphere.It follows that oxygen is two evils
The oxygen source of English de novo formation reaction, most important for the de novo formation of dioxin, oxygen content can in reduction reaction atmosphere
Reduce the production quantity of contaminated soil dioxin during thermal desorption.
Invention content
It is an object of the invention to overcome above-mentioned deficiency existing in the prior art, and provide a kind of pollution of reasonable design
Soil thermal desorption device and its method for reducing dioxin generation reduce Polluted Soil by reducing the oxygen content of reaction atmosphere
The generation of dioxin during earth thermal desorption.
Technical solution is used by the present invention solves the above problems：A kind of contaminated soil thermal desorption device, including heat are de-
Attached rotary kiln and chilling tower；It is characterized in that：Further include nitrogen air accumulator, heat-exchange tube, air gun and divergent nozzle；Nitrogen gas storage
Tank is connected by pipeline with the import of heat-exchange tube, and heat-exchange tube is arranged in chilling tower middle and lower part region；The outlet of heat-exchange tube
It is connected with air gun, air gun stretches to the dioxin formation zone in thermal desorption rotary kiln, and divergent nozzle is equipped on air gun, diffusion
Nozzle is located at the top of contaminated soil in thermal desorption rotary kiln.
Nitrogen air accumulator of the present invention is provided with gas flow control valve and flow measurement device.
Air gun of the present invention is furnished with temperature measuring equipment.
Divergent nozzle of the present invention is with contaminated soil in the vertical direction at a distance of 5-10cm.
Several branches are separated at the top of air gun of the present invention, every branch road is respectively arranged with divergent nozzle.
For every branch of the present invention at a distance of 20-40cm, the spacing of the nozzle of same branch is 20-40cm.
It is surrounded by thermal insulation material outside air gun of the present invention.
Air gun of the present invention is not rotated with thermal desorption rotary kiln and is rotated.
A kind of method that contaminated soil thermal desorption device reduces dioxin generation, it is characterised in that：It comprises the following processes：
（1）, the nitrogen that provides of nitrogen air accumulator enter heat-exchange tube, with the waste heat of chilling tower to entering the nitrogen of thermal desorption rotary kiln
Gas is heated, and ensures the temperature close into kiln nitrogen and contaminated soil, reduces the influence to thermal desorption effect；
（2）, nitrogen through the divergent nozzle on air gun equably be sprayed onto heating after contaminated soil surface, reduce dioxin generate
The oxygen content in region reduces the production quantity of dioxin, even existing dioxin in pollution degradation soil.
During two of the present invention, contaminated soil thermal desorption device keeps continuous feed to be run with discharge.
Compared with prior art, the present invention haing the following advantages and effect：
（1）, the present invention can not only reduce the dioxin into tail flue gas purification system, can also reduce clean after thermal desorption
Dioxin in soil；
（2）, the present invention can in thermal desorption, required temperature determines that air gun enters the amount of stretching into of kiln, the nitrogen of penetrating according to contaminated soil
Gas is easy the region that the entire dioxin of covering generates；
（3）, nitrogen be heated to the temperature close of contaminated soil in rotary kiln and straying quatity it is less, to the temperature of thermal desorption device
It is smaller to spend influence on system operation；
（4）, structure of the invention is compact, connection and reasonable arrangement, easy to operate, effectively reduce contaminated soil two during thermal desorption
Dislike the production quantity of English.
Description of the drawings
Fig. 1 is the structural schematic diagram of the embodiment of the present invention.
Specific implementation mode
The present invention is described in further detail below in conjunction with the accompanying drawings and by embodiment, and following embodiment is to this hair
Bright explanation and the invention is not limited in following embodiments.
Referring to Fig. 1, a kind of contaminated soil thermal desorption device, including thermal desorption rotary kiln 1, cyclone separator 2, dual firing chamber 3,
Chilling tower 4, bag filter 5, eluting column 6, nitrogen air accumulator 8, heat-exchange tube 9, air gun 10 and divergent nozzle 11.
Thermal desorption rotary kiln 1, cyclone separator 2, dual firing chamber 3, chilling tower 4, bag filter 5, eluting column 6 connect successively
It connects.
Nitrogen air accumulator 8 is provided with gas flow control valve and flow measurement device, can adjust well into kiln nitrogen
Flow.Nitrogen air accumulator 8 is connected by pipeline with the import of heat-exchange tube 9.
Heat-exchange tube 9 is arranged in 4 middle and lower part region of chilling tower（The regional temperature is 200-400 DEG C）, heat-exchange tube 9 goes out
Mouth is connected with air gun 10.
Air gun 10 is furnished with temperature measuring equipment, adjusts nitrogen flow according to the temperature value of feedback, ensures the temperature into kiln nitrogen
Degree maintains near contaminated soil thermal desorption required temperature.Air gun 10 stretches to dioxin formation zone in thermal desorption rotary kiln 1
（The regional temperature is 250 DEG C or more）, divergent nozzle 11 is installed on air gun 10, divergent nozzle 11 is located at thermal desorption rotary kiln 1
The top of interior contaminated soil 7, with contaminated soil 7 in the vertical direction at a distance of 5-10 cm.10 top of air gun separates 3 branches, often
Branch is at a distance of 20-40cm.Every branch road of air gun 10 is respectively arranged with divergent nozzle 11, and the spacing of the nozzle 11 of same branch is
20-40cm.It is surrounded by thermal insulation material outside air gun 10.Air gun 10 is not rotated with thermal desorption rotary kiln 1 and is rotated, and is farthest carried
The contact area of high nitrogen and contaminated soil.
A kind of method that above-mentioned contaminated soil thermal desorption device reduces dioxin generation, comprises the following processes：
（1）, the nitrogen that provides of nitrogen air accumulator 8 enter heat-exchange tube 9, with the waste heat of chilling tower 4 to entering thermal desorption rotary kiln 1
Nitrogen carry out being heated to 300 DEG C or so, ensure the temperature close into kiln nitrogen and contaminated soil 7, reduce to thermal desorption effect
Influence.
（2）, nitrogen through the divergent nozzle 11 on air gun 10 equably be sprayed onto heating after 7 surface of contaminated soil, reduce
The oxygen content of dioxin formation zone reduces the production quantity of dioxin, even existing dioxin in pollution degradation soil；
During above-mentioned two, contaminated soil thermal desorption device keeps continuous feed to be run with discharge.Nitrogen flow, air gun 10
The arrangement for entering kiln depth and divergent nozzle 11 is adjusted according to the disposing capacity and thermal desorption required temperature of thermal desorption device.
Inventive principle describes：
Oxygen is the key factor of dioxin de novo formation, and the production quantity of dioxin is with oxygen content（0-10%）Increase and
The oxygen content for increasing, therefore reducing reaction gas during thermal desorption of contaminated soil 7 can reduce the production quantity of dioxin.
To the temperature window of profiling temperatures and dioxin generation of the contaminated soil 7 in thermal desorption rotary kiln 1（250-600℃）Into
Row comparison finds in thermal desorption rotary kiln 1 that only small part contaminated soil be in the temperature region that dioxin generates, therefore can be with
Equably spraying into a small amount of nitrogen reduces the oxygen content in the region, to reduce the production quantity of dioxin, even pollution degradation
Original dioxin in soil 7.Thermal desorption device scale is smaller, exhaust gas volumn in kiln, the nitrogen total amount of penetrating is less, therefore to heat
The stable operation of desorption apparatus influences negligible.
Furthermore, it is necessary to illustrate, the specific embodiment described in this specification, the shape of parts and components is named
Claiming etc. can be different, described in this specification above content is only to structure of the invention example explanation.It is all according to
The equivalence changes or simple change done according to the structure, feature and principle described in inventional idea of the present invention, are included in this hair
In the protection domain of bright patent.Those skilled in the art can do described specific embodiment various
The modify or supplement or adopt similar mode of various kinds substitutes, and without departing from structure of the invention or surmounts present claims
Range defined in book, is within the scope of protection of the invention.
Claims (10)
1. a kind of contaminated soil thermal desorption device, including thermal desorption rotary kiln and chilling tower；It is characterized in that：It further include nitrogen storage
Gas tank, heat-exchange tube, air gun and divergent nozzle；Nitrogen air accumulator is connected by pipeline with the import of heat-exchange tube, heat-exchange tube
It is arranged in chilling tower middle and lower part region；The outlet of heat-exchange tube is connected with air gun, and air gun stretches to two in thermal desorption rotary kiln
English formation zone is disliked, divergent nozzle is installed on air gun, divergent nozzle is located at the top of contaminated soil in thermal desorption rotary kiln.
2. contaminated soil thermal desorption device according to claim 1, it is characterised in that：The nitrogen air accumulator is provided with
Gas flow control valve and flow measurement device.
3. contaminated soil thermal desorption device according to claim 1, it is characterised in that：The air gun is measured equipped with temperature
Device.
4. contaminated soil thermal desorption device according to claim 1, it is characterised in that：The divergent nozzle and Polluted Soil
Earth is in the vertical direction at a distance of 5-10cm.
5. contaminated soil thermal desorption device according to claim 1, it is characterised in that：It is separated at the top of the air gun several
Branch, every branch road are respectively arranged with divergent nozzle.
6. contaminated soil thermal desorption device according to claim 5, it is characterised in that：Every branch is at a distance of 20-
The spacing of 40cm, the nozzle of same branch are 20-40cm.
7. contaminated soil thermal desorption device according to claim 1, it is characterised in that：Heat preservation is surrounded by outside the air gun
Material.
8. contaminated soil thermal desorption device according to claim 1, it is characterised in that：The air gun is not returned with thermal desorption
Rotary kiln is rotated and is rotated.
9. the contaminated soil thermal desorption device described in a kind of claim 1-8 any claims reduces the side that dioxin generates
Method, it is characterised in that：It comprises the following processes：
（1）, the nitrogen that provides of nitrogen air accumulator enter heat-exchange tube, with the waste heat of chilling tower to entering the nitrogen of thermal desorption rotary kiln
Gas is heated, and ensures the temperature close into kiln nitrogen and contaminated soil, reduces the influence to thermal desorption effect；
（2）, nitrogen through the divergent nozzle on air gun equably be sprayed onto heating after contaminated soil surface, reduce dioxin generate
The oxygen content in region reduces the production quantity of dioxin, even existing dioxin in pollution degradation soil.
10. according to the method described in claim 9, it is characterized in that：During described two, contaminated soil thermal desorption device
Continuous feed is kept to be run with discharge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810438323.7A CN108500046A (en) | 2018-05-09 | 2018-05-09 | Contaminated soil thermal desorption device and its method for reducing dioxin generation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810438323.7A CN108500046A (en) | 2018-05-09 | 2018-05-09 | Contaminated soil thermal desorption device and its method for reducing dioxin generation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108500046A true CN108500046A (en) | 2018-09-07 |
Family
ID=63400146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810438323.7A Pending CN108500046A (en) | 2018-05-09 | 2018-05-09 | Contaminated soil thermal desorption device and its method for reducing dioxin generation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108500046A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109396171A (en) * | 2018-12-17 | 2019-03-01 | 中国计量大学 | The device and method of dystopy and thermal desorption coupling processing contaminated soil in situ |
| CN110788123A (en) * | 2019-12-02 | 2020-02-14 | 中科鼎实环境工程有限公司 | Heating device and soil remediation gas thermal desorption equipment |
| CN113369294A (en) * | 2021-06-10 | 2021-09-10 | 上海环土环境科技有限公司 | Polluted soil ex-situ low-carbon circulating thermal desorption system |
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| US5216821A (en) * | 1991-04-10 | 1993-06-08 | Remediation Technologies, Incorporated | System and method for removing a volatile component from a matrix |
| US5230167A (en) * | 1991-10-30 | 1993-07-27 | Westinghouse Electric Corp. | Removal or organics and volatile metals from soils using thermal desorption |
| US20060293551A1 (en) * | 1998-03-31 | 2006-12-28 | Houei Syoukai Co., Ltd. | Method for producing soil, soil-processing unit, method for processing and unit for processing |
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2018
- 2018-05-09 CN CN201810438323.7A patent/CN108500046A/en active Pending
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|---|---|---|---|---|
| US5216821A (en) * | 1991-04-10 | 1993-06-08 | Remediation Technologies, Incorporated | System and method for removing a volatile component from a matrix |
| US5230167A (en) * | 1991-10-30 | 1993-07-27 | Westinghouse Electric Corp. | Removal or organics and volatile metals from soils using thermal desorption |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109396171A (en) * | 2018-12-17 | 2019-03-01 | 中国计量大学 | The device and method of dystopy and thermal desorption coupling processing contaminated soil in situ |
| CN110788123A (en) * | 2019-12-02 | 2020-02-14 | 中科鼎实环境工程有限公司 | Heating device and soil remediation gas thermal desorption equipment |
| CN113369294A (en) * | 2021-06-10 | 2021-09-10 | 上海环土环境科技有限公司 | Polluted soil ex-situ low-carbon circulating thermal desorption system |
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