CN109433814A - Soil heterotopic restorative procedure and its device based on pyrolysis desorption - Google Patents
Soil heterotopic restorative procedure and its device based on pyrolysis desorption Download PDFInfo
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- CN109433814A CN109433814A CN201811452413.8A CN201811452413A CN109433814A CN 109433814 A CN109433814 A CN 109433814A CN 201811452413 A CN201811452413 A CN 201811452413A CN 109433814 A CN109433814 A CN 109433814A
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- 238000003795 desorption Methods 0.000 title claims abstract description 84
- 238000000197 pyrolysis Methods 0.000 title claims abstract description 84
- 239000002689 soil Substances 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000007789 gas Substances 0.000 claims abstract description 60
- 238000002485 combustion reaction Methods 0.000 claims abstract description 36
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000003546 flue gas Substances 0.000 claims abstract description 17
- 230000008676 import Effects 0.000 claims abstract description 9
- 238000004064 recycling Methods 0.000 claims abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 18
- 238000009423 ventilation Methods 0.000 claims description 17
- 238000007873 sieving Methods 0.000 claims description 5
- 235000019504 cigarettes Nutrition 0.000 claims description 2
- 239000004744 fabric Substances 0.000 claims description 2
- 238000010791 quenching Methods 0.000 claims description 2
- 238000009412 basement excavation Methods 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 abstract description 2
- 230000006872 improvement Effects 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000003900 soil pollution Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000013022 venting Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000003610 charcoal Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000037452 priming Effects 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005067 remediation Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- -1 sealing Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000004148 unit process Methods 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
- B09C1/065—Reclamation of contaminated soil thermally by pyrolysis
Landscapes
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention belongs to the recovery technique field of contaminated soil, in particular to a kind of soil heterotopic restorative procedure and its device based on pyrolysis desorption.The soil heterotopic restorative procedure based on pyrolysis desorption is the following steps are included: (1) soil excavation, the soil dug out is stored in closed greenhouse；(2) pretreatment of soil is completed in closed greenhouse；(3) while soil pretreatment, the combustion chamber that the air in closed greenhouse is introduced pyrolysis desorption unit is combustion-supporting；(4) pretreated soil transport to pyrolysis desorption unit is subjected to pyrolysis desorption；(5) combustion chamber that the pyrolysis gas that pyrolysis desorption generates imports pyrolysis desorption unit is burnt；The high-temperature flue gas that combustion chamber generates is used to provide heat source for pyrolysis desorption furnace, carries out recycling or direct emission after high-temperature flue gas after vent gas treatment step.The present invention saves equipment investment while improving the vent gas treatment efficiency of closed greenhouse.
Description
Technical field
The invention belongs to the recovery technique field of contaminated soil, in particular to a kind of soil heterotopic based on pyrolysis desorption is repaired
Multiple method and device thereof.
Background technique
Soil pollution is the significant threat that the sustainable health of land resource utilizes." Soil Pollution Control action plan " mentions
Out: arriving the year two thousand twenty, national soil pollution aggravates trend and tentatively contained, soil environment quality totally keeps stablizing.Numerous
Soil restoring technology in, pyrolysis desorption technology be an emerging efficient technology.Thermal desorption technology is because its process range is wide, repairs
The multiple period is short, increasingly by the favor of technical staff.
Pyrolysis desorption is used as a kind of soil heterotopic processing mode, soil is dug, is crushed etc. processes can generate it is more
Tail Gas.Entire treatment process can be limited in a relatively closed space and carry out by the prior art.Such as application No. is
201710526448.0 innovation and creation disclosed in a kind of organic polluted soil chemical oxidation repair system and its method, including steel
The closed greenhouse of structure, sieving approach device, metering transmission device, chemicals dosing plant, priming apparatus, to be stirred to react device, exhaust gas net
Makeup sets, air-introduced machine, PLC control system, and sieving approach device, metering transmission device, chemicals dosing plant, priming apparatus, stirring are anti-
Device is answered to be separately positioned in the closed greenhouse of steel construction, it is closed that waste gas purification apparatus and air-introduced machine are separately positioned on the steel construction
The outside of greenhouse.Entire processing system will not generate secondary pollution to environment in the closed greenhouse of steel construction.
A kind of for another example innoxious reparation of organic polluted soil disclosed in the innovation and creation application No. is 201810607122.5
Method.It is the following steps are included: the organic polluted soil dug out is transported to closed big by (1) in organic contamination place excavation pit
In canopy, oxidant is added in organic polluted soil and catalyst is thoroughly mixed uniformly, is stacked 24-28h, is aoxidized
Restore organic polluted soil；(2) the redox organic polluted soil through 150-200 DEG C heat treatment 30-50 minutes, obtain heat
Handle organic polluted soil.The program is also required to be provided with exhaust outlet on closed greenhouse, and exhaust-gas treatment dress is connected outside exhaust outlet
It sets.
According to existing engineering practice and document analysis, in soil remediation, when using closed greenhouse, closed greenhouse will necessarily
Configure individual emission-control equipment.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of soil heterotopic reparations based on pyrolysis desorption
Method saves equipment investment while improving the vent gas treatment efficiency of closed greenhouse.
To achieve the goals above, technical scheme is as follows:
Soil heterotopic restorative procedure based on pyrolysis desorption, comprising the following steps: (1) soil excavates, and the soil dug out is stored
In closed greenhouse；(2) pretreatment of soil is completed in closed greenhouse；(3) while soil pretreatment, by closed greenhouse
The combustion chamber that interior air introduces pyrolysis desorption unit is combustion-supporting；(4) by pretreated soil transport to pyrolysis desorption unit into
Row pyrolysis desorption；(5) combustion chamber that the pyrolysis gas that pyrolysis desorption generates imports pyrolysis desorption unit is burnt；Combustion chamber generates
High-temperature flue gas be used for for pyrolysis desorption furnace heat source is provided, carried out after vent gas treatment step after high-temperature flue gas recycle or directly
Run in and puts.
As an improvement, the pretreatment of the soil includes the size controlling of soil and the moisture control of soil.
As a further improvement, the size controlling of the soil is by the size controlling of soil with sieving approach device 4
Within cm, the moisture control of the soil be by the moisture control of soil within 20%.
As an improvement, the air in the closed greenhouse is introduced the combustion chamber of pyrolysis desorption unit by high pressure blower, make close
It closes in greenhouse in negative pressure state to reduce the gas leak in closed greenhouse.
As an improvement, the vent gas treatment step are as follows: the high-temperature flue gas that pyrolysis desorption unit generates is successively through over-quenching
Tower, bag filter also set up activated carbon eductor between chilling tower and bag filter.
As a further improvement, the high-temperature flue gas that the pyrolysis desorption unit generates first passes through after air preheater exchanges heat again
Into chilling tower, the air in closed greenhouse first enters back into the combustion chamber of pyrolysis desorption unit after air preheater preheats.
As further improving, recycling is carried out after the high-temperature flue gas after vent gas treatment step and is referred to high temperature
Flue gas is imported after vent gas treatment step in closed greenhouse.
It is specific as follows the present invention also provides a kind of soil heterotopic prosthetic device based on pyrolysis desorption:
Include based on the soil heterotopic prosthetic device of pyrolysis desorption, including closed greenhouse, pyrolysis desorption unit, pyrolysis desorption unit
Pyrolysis desorption furnace, combustion chamber, tail gas treating unit, it is characterised in that: the combustion chamber of the closed greenhouse and pyrolysis desorption unit
Between be connected by the first ventilation shaft, be provided on the first ventilation shaft high pressure blower for by closed greenhouse air introduce
It is pyrolyzed the combustion chamber of desorption unit.
As an improvement, the second ventilation shaft is provided between the tail gas treating unit and closed greenhouse, the second ventilation duct
Road will be for that will import closed greenhouse by tail gas treating unit treated tail gas.
As a further improvement, the tail gas treating unit successively includes air preheater, chilling tower, active carbon injection
Device, bag filter, the first ventilation shaft between closed greenhouse and the combustion chamber for being pyrolyzed desorption unit pass through air preheater.
Inventive concept of the invention is:
The exhaust treatment system for cancelling closed greenhouse makes the air in closed greenhouse as the combustion air of pyrolysis desorption unit
With；Closed greenhouse will be imported by tail gas treating unit treated tail gas simultaneously, and make contaminated gas only in closed greenhouse
It is recycled between pyrolysis desorption unit, to reduce the influence to ambient enviroment.
The beneficial effects of the present invention are:
(1) in the prior art, the tail gas of closed greenhouse frequently with activated carbon adsorption mode, and activated carbon adsorption have it is certain
Selectivity, different activities charcoal are different to the adsorption saturation degree of different pollutants, i.e., adsorption rate differs greatly, therefore simple activity
Charcoal goes absorption to be difficult to the thoroughly absorption simultaneously by various pollutants, and the consumption of active carbon is very big.And the present invention will be closed big
Air in canopy is used as the combustion air of pyrolysis desorption unit, and the pollutant generated in closed greenhouse is in 850-1100 DEG C of temperature
It is lower to be handled through burning, it handles more thorough；
(2) a large amount of combustion air air of pyrolysis desorption process needs, and the oxygen content of waste gas and air oxygen generated in closed greenhouse
Content is not much different, and dust content is moderate to be complied fully with and do the condition of pyrolysis desorption combustion air and therefore handle the two collaboration,
Reach emission reduction effect；
(3) air preheater plays the role of as cooling high-temperature fume, while to will enter being gone out by closed greenhouse for combustion chamber
The exhaust gas come is preheated, and the pollutant be conducive in exhaust gas more fully burns in combustion chamber；
(4) closed greenhouse will be imported by tail gas treating unit treated tail gas, the residual temperature of tail gas can accelerate the dry of soil
It is dry, while recycle contaminated gas only between closed greenhouse and pyrolysis desorption unit.It is of course also possible to which tail gas will be passed through
Tail gas direct emission after processing unit processes.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
In figure: 1, closed greenhouse；2, pyrolysis desorption furnace；21, feeding inlet；22, discharge port；23, pyrolysis gas outlet；24, cigarette
Gas outlet；3, combustion chamber；41, air preheater；42, chilling tower；43, activated carbon eductor；44, bag filter；51,
One ventilation shaft；52, the second ventilation shaft；53, third venting pipeline；6, high pressure blower.
Specific embodiment
Embodiment 1
Soil heterotopic restorative procedure based on pyrolysis desorption, comprising the following steps:
(1) soil excavates, and the soil dug out is stored in closed greenhouse.
(2) pretreatment of soil is completed in closed greenhouse.The pretreatment of soil includes the size controlling and soil of soil
Moisture control, the size controlling of soil be with sieving approach device by the size controlling of soil within 4 cm, soil
Moisture control be by the moisture control of soil within 20%.
(3) while soil pretreatment, the air in closed greenhouse is introduced into pyrolysis desorption unit by high pressure blower
Combustion chamber is combustion-supporting, and high pressure blower makes in closed greenhouse in negative pressure state to reduce the gas leak in closed greenhouse.
(4) pretreated soil transport to pyrolysis desorption unit is subjected to pyrolysis desorption.
(5) combustion chamber that the pyrolysis gas that pyrolysis desorption generates imports pyrolysis desorption unit is burnt；What combustion chamber generated
High-temperature flue gas is used to provide heat source for pyrolysis desorption furnace, through vent gas treatment step, vent gas treatment step after high-temperature flue gas are as follows: hot
The high-temperature flue gas that solution desorption unit generates successively passes through air preheater, chilling tower, bag filter, removes in chilling tower with cloth bag
Activated carbon eductor is also set up between dirt device.Air in closed greenhouse first enters back into pyrolysis desorption after air preheater preheats
The combustion chamber of unit.Tail gas carries out recycling after processing or direct emission, tail gas recycling refer to high-temperature flue gas through tail gas
It is imported after processing step in closed greenhouse.
Soil heterotopic prosthetic device based on pyrolysis desorption is as shown in Figure 1, include closed greenhouse 1, pyrolysis desorption unit, heat
Solving desorption unit includes pyrolysis desorption furnace 2, combustion chamber 3, tail gas treating unit.
Closed greenhouse 1 is the prior art, can be used that application No. is samples disclosed in the innovation and creation of 201810460389 .6
Formula, it is also possible to which existing workshop through thin colored steel edge sealing, PVDF/PVC film be closed etc. reequip to obtain by modes.It is provided in closed greenhouse 1
Rotary screen, the mesh size of rotary screen are 4cm, power of motor 7.5kw.Soil block less than 4cm is delivered to as undersize material
Feed bin send to hammer mill greater than 4cm on-the-sieve material and carries out break process.
Pyrolysis desorption furnace 2 is equipped with feeding inlet 21, discharge port 22, pyrolysis gas outlet 23, exhanst gas outlet 24.Closed greenhouse 1
It is connected between the combustion chamber 2 of pyrolysis desorption unit by the first ventilation shaft 51, is provided with high-pressure blast on the first ventilation shaft 51
Machine 6 is used to introduce in closed greenhouse 1 air the combustion chamber 3 of pyrolysis desorption unit.The power of motor of high pressure blower 6 is generally
45Kw or more.Tail gas treating unit successively includes air preheater 41, chilling tower 42, activated carbon eductor 43, bag-type dust
Device 44, the first ventilation shaft 51 between closed greenhouse 1 and the combustion chamber 3 for being pyrolyzed desorption unit pass through air preheater 41.Tail
The second ventilation shaft 52 is provided between gas disposal unit and closed greenhouse 1, the second ventilation shaft 52 will be for that will pass through at tail gas
Tail gas after managing cell processing imports closed greenhouse 1.It is provided between pyrolysis gas outlet 23 and the combustion chamber 3 for being pyrolyzed desorption unit
Third venting pipeline 53, third venting pipeline 53 are used to be pyrolyzed the burning that the pyrolysis gas that desorption generates imports pyrolysis desorption unit
It burns room 3.
Claims (10)
1. the soil heterotopic restorative procedure based on pyrolysis desorption, which comprises the following steps: (1) soil excavates, and will dig
Soil out is stored in closed greenhouse；(2) pretreatment of soil is completed in closed greenhouse；(3) in the same of soil pretreatment
When, the combustion chamber that the air in closed greenhouse is introduced pyrolysis desorption unit is combustion-supporting；(4) by pretreated soil transport to heat
Solution desorption unit carries out pyrolysis desorption；(5) combustion chamber that the pyrolysis gas that pyrolysis desorption generates imports pyrolysis desorption unit is fired
It burns；The high-temperature flue gas that combustion chamber generates, which is used to that furnace to be desorbed for pyrolysis, provides heat source, after high-temperature flue gas after vent gas treatment step
Carry out recycling or direct emission.
2. the soil heterotopic restorative procedure according to claim 1 based on pyrolysis desorption, it is characterised in that: the soil
Pretreatment includes the size controlling of soil and the moisture control of soil.
3. the soil heterotopic restorative procedure according to claim 2 based on pyrolysis desorption, it is characterised in that: the soil
Size controlling is by the size controlling of soil within 4 cm with sieving approach device, and the moisture control of the soil is will
The moisture control of soil is within 20%.
4. the soil heterotopic restorative procedure according to claim 1 based on pyrolysis desorption, it is characterised in that: described closed big
Air in canopy is introduced the combustion chamber of pyrolysis desorption unit by high pressure blower, is made close to reduce in negative pressure state in closed greenhouse
Close the gas leak in greenhouse.
5. the soil heterotopic restorative procedure according to claim 1 based on pyrolysis desorption, it is characterised in that: the tail gas
Processing step are as follows: the high-temperature flue gas that pyrolysis desorption unit generates is successively through over-quenching tower, bag filter, in chilling tower and cloth bag
Activated carbon eductor is also set up between deduster.
6. the soil heterotopic restorative procedure according to claim 5 based on pyrolysis desorption, it is characterised in that: the pyrolysis is de-
The high-temperature flue gas that coupon member generates enters back into chilling tower after first passing through air preheater heat exchange, and the air in closed greenhouse is first through sky
The combustion chamber of pyrolysis desorption unit is entered back into after air preheater preheating.
7. the soil heterotopic restorative procedure according to claim 1 based on pyrolysis desorption, it is characterised in that: the high temperature cigarette
It carries out recycling after vent gas treatment step after gas and refers to and import high-temperature flue gas in closed greenhouse after vent gas treatment step.
8. based on the soil heterotopic prosthetic device of pyrolysis desorption, including closed greenhouse, pyrolysis desorption unit, it is pyrolyzed desorption unit packet
Include pyrolysis desorption furnace, combustion chamber, tail gas treating unit, it is characterised in that: the burning of the closed greenhouse and pyrolysis desorption unit
It is connected between room by the first ventilation shaft, high pressure blower is provided on the first ventilation shaft for drawing the air in closed greenhouse
Enter to be pyrolyzed the combustion chamber of desorption unit.
9. the soil heterotopic prosthetic device according to claim 8 based on pyrolysis desorption, it is characterised in that: at the tail gas
The second ventilation shaft is provided between reason unit and closed greenhouse, the second ventilation shaft by tail gas treating unit for that will handle
Tail gas afterwards imports closed greenhouse.
10. the soil heterotopic prosthetic device according to claim 8 based on pyrolysis desorption, it is characterised in that: the tail gas
Processing unit successively includes air preheater, chilling tower, activated carbon eductor, bag filter, and closed greenhouse and pyrolysis are desorbed
The first ventilation shaft between the combustion chamber of unit passes through air preheater.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811452413.8A CN109433814A (en) | 2018-11-30 | 2018-11-30 | Soil heterotopic restorative procedure and its device based on pyrolysis desorption |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811452413.8A CN109433814A (en) | 2018-11-30 | 2018-11-30 | Soil heterotopic restorative procedure and its device based on pyrolysis desorption |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110340126A (en) * | 2019-06-28 | 2019-10-18 | 中节能大地环境修复有限公司 | Contaminated soil heterotopic thermal desorption processing method and its thermal desorption system |
| CN110369477A (en) * | 2019-08-30 | 2019-10-25 | 浙江宜可欧环保科技有限公司 | Soil pyrolysis treating method and equipment based on directly pyrolysis desorption |
| CN111014263A (en) * | 2019-11-22 | 2020-04-17 | 光大环境修复(江苏)有限公司 | System and method for ex-situ industrial remediation of contaminated soil |
| CN112387769A (en) * | 2020-09-30 | 2021-02-23 | 南京格洛特环境工程股份有限公司 | Micro negative pressure collecting and processing system for contaminated soil ex-situ remediation engineering |
| CN113634049A (en) * | 2021-08-07 | 2021-11-12 | 浙江宜可欧环保科技有限公司 | Pyrolysis desorption gas dust removal method and pyrolysis desorption furnace applying same |
| CN115351057A (en) * | 2022-07-12 | 2022-11-18 | 中国瑞林工程技术股份有限公司 | Soil remediation method for normal-temperature enhanced desorption |
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| CN115351057A (en) * | 2022-07-12 | 2022-11-18 | 中国瑞林工程技术股份有限公司 | Soil remediation method for normal-temperature enhanced desorption |
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