CN108405590A - High boiling point organic compound contaminated soil remediation system adopting recirculating and restorative procedure - Google Patents
High boiling point organic compound contaminated soil remediation system adopting recirculating and restorative procedure Download PDFInfo
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- CN108405590A CN108405590A CN201810365484.8A CN201810365484A CN108405590A CN 108405590 A CN108405590 A CN 108405590A CN 201810365484 A CN201810365484 A CN 201810365484A CN 108405590 A CN108405590 A CN 108405590A
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- 239000002689 soil Substances 0.000 title claims abstract description 71
- 238000009835 boiling Methods 0.000 title claims abstract description 36
- 150000002894 organic compounds Chemical class 0.000 title claims abstract description 28
- 238000005067 remediation Methods 0.000 title claims abstract description 23
- 230000003134 recirculating effect Effects 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000003795 desorption Methods 0.000 claims abstract description 65
- 238000010438 heat treatment Methods 0.000 claims abstract description 40
- 238000002485 combustion reaction Methods 0.000 claims abstract description 35
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 31
- 238000012545 processing Methods 0.000 claims abstract description 26
- 230000007246 mechanism Effects 0.000 claims abstract description 7
- 230000008676 import Effects 0.000 claims abstract description 4
- 239000003546 flue gas Substances 0.000 claims description 36
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- 239000007789 gas Substances 0.000 claims description 25
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 20
- 230000018044 dehydration Effects 0.000 claims description 5
- 238000006297 dehydration reaction Methods 0.000 claims description 5
- 239000012716 precipitator Substances 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- 238000011282 treatment Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 5
- 238000004891 communication Methods 0.000 abstract description 3
- 239000004016 soil organic matter Substances 0.000 abstract 1
- 101100385390 Caenorhabditis elegans kin-3 gene Proteins 0.000 description 16
- 239000005416 organic matter Substances 0.000 description 9
- 238000005265 energy consumption Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 238000011084 recovery Methods 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 5
- 238000000605 extraction Methods 0.000 description 5
- 238000003900 soil pollution Methods 0.000 description 5
- 239000004744 fabric Substances 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 235000019504 cigarettes Nutrition 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- -1 flue gas Organic compound Chemical class 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000575 pesticide Substances 0.000 description 2
- 150000003071 polychlorinated biphenyls Chemical class 0.000 description 2
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 241000220324 Pyrus Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010410 dusting Methods 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 235000021184 main course Nutrition 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 235000021017 pears Nutrition 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000002680 soil gas Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000004065 wastewater treatment 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
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- 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)
Abstract
The present invention relates to high boiling point organic compound contaminated soil remediation system adopting recirculating and restorative procedures, the system includes the feeder being sequentially communicated, dewatering device and thermal desorption mechanism, dewatering device includes indirect type kin, it is arranged with heating jacket outside indirect type kin, thermal desorption mechanism includes direct-type thermal desorption kiln, the exhaust outlet of the direct-type thermal desorption kiln has been sequentially communicated combustion decomposition device and heat exchanger, and the exhanst gas outlet of combustion decomposition device is connected to the heating medium entrance of heat exchanger；The outlet of heating jacket is connected to the heat-absorbing medium entrance of heat exchanger, the inlet communication of the heat-absorbing medium outlet and heating jacket of heat exchanger is equipped with circulating pump between the outlet of heating jacket and the heat-absorbing medium entrance of heat exchanger and/or between the outlet of the heat-absorbing medium of heat exchanger and the import of heating jacket.The present invention has the characteristics that operating cost is low, processing capacity is big, stable and non-secondary pollution while meeting soil organic matter desorption effect.
Description
Technical field
The present invention relates to a kind of high boiling point organic compound contaminated soil remediation system adopting recirculating and restorative procedures.
Background technology
Severe soil pollution situation in face of China, State Ministry of Environmental Protection just issues within 2004《About carrying out enterprise conscientiously
The notice that environmental pollution prevention and control works in industry moving process》.Chinese Ministry of Environmental Protection issues within 2008《About reinforcement Soil Pollution Control work
The opinion of work》.Implement from State Council approved in 2011《Xiangjiang River basin Heavy Metal Pollution Control embodiment》Since, it is heavy metal-polluted
Dye soil remediation achieves noticeable achievement.Chinese Ministry of Environmental Protection issues within 2014《About reinforce industrial enterprise shut down, move and former address place redevelopment
The notice to be worked using prevention and cure of pollution in the process》, contaminated site of keeping under strict control circulation and development ＆ construction are examined.
On May 31st, 2016, State Council prints and distributes《Soil Pollution Control action plan》（It is commonly called as " ten, soil "）, to from now on one
The Soil Pollution Control work of a period China is made that overall strategy is disposed.
The main course of soil restoring technology development is as follows in the world：1980 former, to excavate landfill, heavy metal pollution of soil, consolidate
Change/stabilisation, SOIL GAS steam extract, based on chemical extraction；1980-2000, with multiphase extraction, elution, chemical extraction, oxygen
Change based on the technologies such as reduction, vitrifying, thermal desorption；After 2000, according to soil pollution feature, soil remediation is a variety of to formulate
Based on recovery technique scheme for combining.
Compared to foreign countries, thermal desorption repairing polluted soil research in China's is in starting and gradually promotes and applies the stage, wherein
Direct thermal desorption technology is mainly used in soil, sludge, sediment, the filter residue of processing volatility and half volatile organic contaminant
The reparation of equal contaminated sites.
Direct thermal desorption technology is to make the organic pollution in soil volatilize by direct-fired mode to remove, and soil is viscous
Native content, water content and matter property are the key factors for influencing thermal desorption heat utilization rate and pollutant desorption efficiency.But
It is the soil stickiness height of China's major part contaminated site, water content is high, especially in southern developed regions.Therefore directly thermal desorption is deposited
Equipment energy consumption is big, heat recovery rate is low, equipment failure rate is high（The heat exchanger components foulings such as cloth bag blocking, boiler）Etc. problems.
Indirect thermal desorption technology is to make the organic pollution in soil volatilize by way of indirectly heat to remove, but deposit
It is limited in heat exchange area, the problems such as coefficient of heat transfer is low so that its processing capacity is limited, it is difficult to meet the requirement in market.
A kind of organic polluted soil multistage thermal desorption repair system of the Invention Announce of Patent No. CN 104607455A,
Multistage thermal desorption equipment is simply used to improve the rate of recovery of heat, is actually to prevent organic matter from condensing out again, most
The exit gas temperature of rear stage thermal desorption equipment necessarily requires to ensure more than organic matter boiling point.Therefore the system heat recovery rate
It is limited, and organic matter is removed by the way of wet sprinkling, wastewater treatment and the cost of activated carbon can be increased.
Therefore, exploitation is a kind of is used for handling pesticide, polycyclic aromatic hydrocarbon, the height of the high boiling point organic compounds contaminated soil such as Polychlorinated biphenyls
Effect energy conservation and environmental protection segmented thermal desorption processing system is very important.
Invention content
The present invention is intended to provide a kind of high boiling point organic compound contaminated soil remediation system adopting recirculating and restorative procedure that operation energy consumption is low.
In order to solve the above-mentioned technical problem, technical scheme is as follows：High boiling point organic compound contaminated soil remediation system
It unites, including feeder, dewatering device and the thermal desorption mechanism being sequentially communicated, the dewatering device includes indirect type kin,
Heating jacket is arranged with outside indirect type kin, the thermal desorption mechanism includes direct-type thermal desorption kiln, and the direct-type heat is de-
The exhaust outlet of attached kiln has been sequentially communicated combustion decomposition device, and the exhanst gas outlet of combustion decomposition device and the heating medium entrance of heat exchanger connect
It is logical；The outlet of the heating jacket is connected to the heat-absorbing medium entrance of heat exchanger, and heat-absorbing medium outlet and the heating of heat exchanger are pressed from both sides
The inlet communication of set, between the outlet of the heating jacket and the heat-absorbing medium entrance of heat exchanger and/or the heat absorption of heat exchanger is situated between
Matter is exported is equipped with circulating pump between the import of heating jacket；The exhaust outlet of indirect type kin is communicated with vacuum pump.
Further, the feeder includes soil buffer storehouse, and the soil buffer storehouse passes through with indirect type kin
Feed valve is connected to.
Further, the exhaust outlet of the indirect type kin is communicated with the first exhaust gas processing device.
Further, first exhaust gas processing device includes the condenser being sequentially communicated and activated carbon slot, the condensation
The air inlet of device is connected to the exhaust outlet of indirect type kin.Activated carbon slot, which can be used for adsorbing, to be desorbed in indirect type kin
A small amount of organic matter, ensure discharge gas it is up to standard.Further, the condenser is water condenser.
Further, the heat exchanger is steam heat exchanger.
Further, the discharge port of indirect type kin and the feed inlet of direct-type thermal desorption kiln are connected by screw conveyor
It is logical.Screw conveyor can guarantee the continuous conveying between indirect type kin, direct-type thermal desorption kiln, and can effectively prevent straight
The flue gas water conservancy diversion for connecing the generation of formula thermal desorption kiln enters in indirect type kin, in addition, can also be played to indirect type kin certain close
Envelope acts on, and is conducive to the formation of negative pressure and the holding of pressure in indirect type kin.The size of negative pressure is according to the processing energy of equipment
Power, moisture content and steam heat exchanger recycle the temperature of heat medium to be considered.
Further, the exhaust outlet of direct-type thermal desorption kiln is set to the feed end of direct-type thermal desorption kiln, direct in this way
Flue gas flow direction in formula thermal desorption kiln is with flow direction of material on the contrary, fully heat exchange, promotes thermal desorption effect.
Further, end where direct-type thermal desorption kiln discharge port is equipped with the first burner；It is set in the combustion decomposition device
There is the second burner, when work, the second burner jets out flames, with the smoke contacts in combustion decomposition device so that in flue gas
Organic compound combustion decomposes.
Further, it is communicated with dust-precipitator between the exhaust outlet of direct-type thermal desorption kiln and combustion decomposition device.Preferably, institute
It is rotoclone collector to state dust-precipitator.
Further, the heating medium outlet of the heat exchanger has air-introduced machine, can in promotion system gas flowing.
Further, the heating medium outlet of the heat exchanger has the second exhaust gas processing device, it is preferable that described
Two exhaust gas processing devices include the extracting tower, deduster and chimney being sequentially communicated.Further, the extracting tower is de- for semidry method
Acid tower.The deduster is bag filter.
The method for carrying out soil remediation using such as above-mentioned system, includes the following steps：
（1）Soil to be repaired is inputted into indirect type kin by feeder, meanwhile, start indirect type kin, vacuum pump,
Direct-type thermal desorption kiln, combustion decomposition device and circulating pump, control indirect type dehydration kiln inner pressure are negative pressure, control indirect type dehydration
Kiln temperature is under current pressure more than the boiling point of water so that the water in soil to be repaired is vaporized；
（2）Step will be passed through（1）Dewatered soil is delivered in direct-type thermal desorption kiln, is carried out direct thermal desorption processing, is made
The high boiling point organic compound obtained in soil is volatized into flue gas, and the soil that thermal desorption has been handled is discharged, and carries out subsequent processing；
（3）By step（2）In be mixed with high boiling point organic compound flue gas be sent into combustion decomposition device in, combustion decomposition, obtain temperature be
900 DEG C or more of high-temperature flue gas；
（4）By step（3）In high-temperature flue gas be passed through in heat exchanger, high-temperature flue gas with from heating jacket conveying come circulatory mediator
Fully heat exchange, obtains the circulatory mediator after low-temperature flue gas and heating, and low-temperature flue gas is sent into next step treatment process, following after heating
Ring medium is sent into heating jacket and carries out next round dehydration.
Further, step（1）In, indirect type is dehydrated kiln inner pressure control in -10Pa or so, preferably -5-15Pa.
Further, step（2）In, control direct-type thermal desorption kiln temperature is higher than organic matter boiling point.
Further, step（2）It is middle to be discharged through thermal desorption treated soil, backfill processing.
Further, step（3）In, temperature control is at 900 DEG C or more in combustion decomposition device.Further, flue gas is controlled
The residence time is in 2s or more in combustion decomposition device.
Further, the temperature of the low-temperature flue gas is 400-500 DEG C.
Further, the circulatory mediator includes water.
The present invention according to the difference of water and organic matter boiling point, by soil moisture and organic pollution substep remove, subtract
The content for entering water in the flue gas of combustion decomposition device less, reduces the total amount of flue gas, reduces combustion decomposition device energy consumption, and reduction is set
The energy consumption of received shipment row, while reducing the risk that equipment operation blocks.Meanwhile the high temperature cigarette that organic pollution desorption processing generates
Gas high efficient heat exchanging in heat exchanger with the circulatory mediator in heating jacket, the circulatory mediator after heat exchange put into next round dehydration again
Processing, organic compound combustion decomposes the heat generated and the heat of thermal desorption kiln fuel combustion generation is utilized effectively, substantially
Reduce energy consumption.Negative pressure state is in indirect type kin in addition, may make by vacuum pump, to reduce the boiling point of water, drop
Low soil water desorption difficulty, even if circulatory mediator may make indirect type to be dehydrated kiln temperature if being hot water of the temperature no more than 100 DEG C
Higher than boiling point aqueous in soil in kin so that water is effectively deviate from soil, and reduces energy consumption, to reduce operation at
This.
Compared with prior art, beneficial effects of the present invention：
The high boiling point organic compound contaminated soil remediation system adopting recirculating of the present invention is according to the difference of water and organic matter boiling point by the water in soil
Divide and organic pollution successively removes step by step, wherein the vapor for being desorbed out in indirect type kin can be cold by condenser
It is discharged after solidifying, by indirect type kin, treated that soil moisture content significantly declines, and it is de- to enter back into direct-type thermal desorption kiln
Removal organic polluter, because contaminated soil moisture content significantly declines, so the fuel consumption of direct-type thermal desorption kiln significantly under
Drop, while the gas gross for entering the processing of combustion decomposition device also and then significantly declines, so that combustion decomposition device fuel consumes
Amount also significantly declines, while being provided with thermal recovery unit -- heat exchanger at combustion decomposition device rear portion, and the heat of recycling is used for
Heat indirect type kin.The setting of the vent gas treatments facility such as activated carbon slot, extracting tower, deduster, it is ensured that system discharge
Tail gas meets the requirement of national environmental protection.
The high boiling point organic compound contaminated soil remediation system adopting recirculating of the present invention, can effectively realize in high boiling point organic compound contaminated soil
The desorption of organic matter has the characteristics that operating cost is low, removal efficiency is high, non-secondary pollution, be particularly suitable for it is existing by pesticide,
The repair process of the high boiling point organic compounds contaminated soil such as polycyclic aromatic hydrocarbon, Polychlorinated biphenyls.
Description of the drawings
Fig. 1 is the high boiling point organic compound contaminated soil remediation system adopting recirculating structural schematic diagram of the first embodiment of the invention.
Specific implementation mode
Come that the present invention will be described in detail below with reference to attached drawing and in conjunction with the embodiments.It should be noted that in the feelings not conflicted
Under condition, the feature in embodiment and embodiment in the present invention can be combined with each other.For sake of convenience, hereinafter as occurred
"upper", "lower", "left", "right" printed words only indicate consistent with the upper and lower, left and right direction of attached drawing itself, do not play limit to structure
It is set for using.
As shown in Figure 1, high boiling point organic compound contaminated soil remediation system adopting recirculating, including the feeder, the dewaterer that are sequentially communicated
Structure and thermal desorption mechanism, the dewatering device include indirect type kin 3, are arranged with heating jacket outside indirect type kin 3, institute
It includes direct-type thermal desorption kiln 5 to state thermal desorption mechanism, and the exhaust outlet of the direct-type thermal desorption kiln 5 has been sequentially communicated combustion decomposition
Device 7, the exhanst gas outlet of combustion decomposition device 7 are connected to the heating medium entrance of heat exchanger 8；The outlet and heat exchange of the heating jacket
The heat-absorbing medium entrance of device 8 is connected to, the inlet communication of the heat-absorbing medium outlet and heating jacket of heat exchanger 8, the heating jacket
Outlet and the heat-absorbing medium entrance of heat exchanger 8 between be equipped with the circulating pump 17 that is sequentially communicated and storage bin 16；Indirect type is dehydrated
The exhaust outlet of kiln 3 is communicated with vacuum pump 14.
Wherein, the feeder includes soil buffer storehouse 1, and the soil buffer storehouse 1 is with indirect type kin 3 by giving
Expect that valve 2 is connected to.
The exhaust outlet of the indirect type kin 3 is communicated with the first exhaust gas processing device.First exhaust gas processing device
Including the condenser 13 being sequentially communicated and activated carbon slot 15, the exhaust of the air inlet and indirect type kin 3 of the condenser 13
Mouth connection.Vacuum pump 14 is set between condenser and activated carbon slot.
The discharge port of indirect type kin 3 is connected to the feed inlet of direct-type thermal desorption kiln 5 by screw conveyor 4.
End is equipped with the first burner 18 where 5 discharge port of direct-type thermal desorption kiln；Second is equipped in the combustion decomposition device 7
Burner 19.
It is communicated with dust-precipitator 6 between the exhaust outlet and combustion decomposition device 7 of direct-type thermal desorption kiln 5.Preferably, described to gather dust
Device is rotoclone collector.
Existing relevant device can be used in indirect type kin 3, direct-type thermal desorption kiln 5.
The heating medium outlet of the heat exchanger 8 has air-introduced machine 11.The heating medium outlet of the heat exchanger 8
There is the second exhaust gas processing device, it is preferable that second exhaust gas processing device includes the extracting tower 9 being sequentially communicated, deduster 10
With chimney 12.Shown air-introduced machine 11 is set between deduster 10 and chimney 12.
When operation, pending contaminated soil can by forklift artificial conveyance to soil buffer storehouse 1, then by feed valve 2 into
Enter indirect type kin 3, contaminated soil is heated in indirect type kin 3, and the temperature controlled in kiln makes in contaminated soil
Water be vaporized, organic matter enters direct-type thermal desorption kiln 5 and is desorbed again, and the water vapour generated in indirect type kin 3 enters gas
Entered in condenser 13 by the extraction of vacuum pump 14 effect in phase and be cooled to water again, part incoagulable gas enters activated carbon
It is emptied after the processing of slot 15.
Dewatered contaminated soil is carried out by indirect type kin 3, and direct thermal desorption is delivered to by screw conveyor 4
The high-temperature flue gas that kiln 5 and the first burner 18 generate carries out counter current contacting.So that the high boiling point organic compound in contaminated soil carries out
Vaporization desorption enters in flue gas, and flue gas carries out rough dusting into deduster 6, enter back under the extraction effect of air-introduced machine 11
Combustion decomposition device 7, the thermal energy generated using the second burner 19 makes flue-gas temperature reach 900 DEG C or more, so that flue gas
In organic pollution whole combustion decomposition at CO2、H2O、SO2Equal substances.The high-temperature flue gas come out from combustion decomposition device 7 enters
Heat exchanger 8, using circulating pump 17 come water be cooled to as low-temperature receiver so that flue-gas temperature drops to 400 after heat exchanger 8
DEG C ~ 500 DEG C, it enters back into extracting tower 9 and removes SO2, the sour gas such as HCl, HF, while spraying into aqueous lye and so that flue-gas temperature is anxious
After being cooled to 180 DEG C enter bag-type dust carry out depth dedusting, after pass through smoke stack emission 12.
The feed valve 2 ensures the continuity and adjustability of soil charging using frequency conversion revolution feed valve, while having one
Fixed leakproofness is conducive to kiln inner pressure and maintains negative pressure.
Further, the indirect type kin 3 is the external pears blade heating mixer for being equipped with heating jacket, further
Ground, kiln inner pressure control is negative pressure in control indirect type kin 3, control kiln temperature under current pressure water boiling temperature with
On, negative pressure is conducive to the removing of moisture content in contaminated soil, reduces and enters containing for organic material contaminated soil in direct-type thermal desorption kiln 5
Water rate, so reduce equipment energy consumption and follow-up equipment because water content is big in flue gas, acid dew point is low, and lead to the powder in flue gas
The risk of dirt fouling and clogging equipment, in addition, the heat source needed for indirect type kin 3 uses the heat from the heat exchange of heat exchanger 8 out
Water or steam improve the heat utilization efficiency of equipment.
Further, control 13 flue gas exit temperature of condenser is less than 30 DEG C, reduces the use of activated carbon in activated carbon slot 15
Amount.
The heat exchanger 8 using circulating pump 17 come water as low-temperature receiver, the cooling high temperature cigarette come out from combustion decomposition device 7
Gas so that flue-gas temperature drops to 400 DEG C ~ 500 DEG C after steam heat exchanger 8, and the hot water or steam that heat exchanger 8 generates are done
Heat source for indirect type kin 3 makes contaminated soil be dehydrated, and improves the heat recovery rate of equipment.
The spray liquid that the extracting tower 9 uses is low-concentration alkali liquor, for removing sour gas, while spraying into a large amount of aqueous
Lye makes flue-gas temperature be chilled to 180 DEG C, and the purpose for spraying into a large amount of aqueous lye makes flue gas be dropped to from 400 ~ 500 DEG C
180 DEG C, while ensureing cloth bag operational safety, regrouping for bioxin is prevented, and because of the dirt of direct-type thermal desorption kiln 5
After dye soil is dehydrated in indirect type kin 3 so that it is low into water content in the flue gas of extracting tower 9, therefore spray into and largely contain
Scale liquid will not increase the risk of cloth bag blocking.
The content that above-described embodiment illustrates should be understood as that these embodiments are only used for being illustrated more clearly that the present invention, without
For limiting the scope of the invention, after having read the present invention, various equivalent forms of the those skilled in the art to the present invention
Modification each fall within the application range as defined in the appended claims.
Claims (10)
1. high boiling point organic compound contaminated soil remediation system adopting recirculating, including the feeder, dewatering device and the thermal desorption machine that are sequentially communicated
Structure, which is characterized in that the dewatering device includes indirect type kin（3）, indirect type kin（3）It is outer to be arranged with heating folder
Set, the thermal desorption mechanism includes direct-type thermal desorption kiln（5）, the direct-type thermal desorption kiln（5）Exhaust outlet be communicated with combustion
Burn decomposer（7）, combustion decomposition device（7）Exhanst gas outlet and heat exchanger（8）Heating medium entrance connection；The heating jacket
Outlet and heat exchanger（8）Heat-absorbing medium entrance connection, heat exchanger（8）Heat-absorbing medium outlet connect with the import of heating jacket
It is logical, the outlet of the heating jacket and heat exchanger（8）Heat-absorbing medium entrance between and/or heat exchanger（8）Heat-absorbing medium go out
Circulating pump is equipped between mouth and the import of heating jacket；Indirect type kin（3）Exhaust outlet be communicated with vacuum pump（14）.
2. high boiling point organic compound contaminated soil remediation system adopting recirculating according to claim 1, which is characterized in that the feeder
Including soil buffer storehouse（1）, the soil buffer storehouse（1）With indirect type kin（3）Pass through feed valve（2）Connection.
3. high boiling point organic compound contaminated soil remediation system adopting recirculating according to claim 1, which is characterized in that the indirect type is de-
Water kiln（3）Exhaust outlet be communicated with the first exhaust gas processing device.
4. high boiling point organic compound contaminated soil remediation system adopting recirculating according to claim 3, which is characterized in that first tail gas
Processing unit includes the condenser being sequentially communicated（13）With activated carbon slot（15）, the condenser（13）Air inlet and indirect type
Kin（3）Exhaust outlet connection.
5. high boiling point organic compound contaminated soil remediation system adopting recirculating according to claim 1, which is characterized in that indirect type kin
（3）Discharge port and direct-type thermal desorption kiln（5）Feed inlet pass through screw conveyor（4）Connection.
6. high boiling point organic compound contaminated soil remediation system adopting recirculating according to claim 1, which is characterized in that direct-type thermal desorption
Kiln（5）End is equipped with the first burner where discharge port（18）；The combustion decomposition device（7）Inside it is equipped with the second burner（19）.
7. high boiling point organic compound contaminated soil remediation system adopting recirculating according to claim 1, which is characterized in that direct-type thermal desorption
Kiln（5）Exhaust outlet and combustion decomposition device（7）Between be communicated with dust-precipitator（6）.
8. high boiling point organic compound contaminated soil remediation system adopting recirculating according to claim 1, which is characterized in that the heat exchanger
（8）Heating medium outlet have air-introduced machine（11）.
9. high boiling point organic compound contaminated soil remediation system adopting recirculating according to claim 1, which is characterized in that the heat exchanger
（8）Heating medium outlet have the second exhaust gas processing device, it is preferable that second exhaust gas processing device include connect successively
Logical extracting tower（9）, deduster（10）And chimney（12）.
10. the method for carrying out soil remediation using such as claim 1-9 any one of them system, which is characterized in that including such as
Lower step：
（1）Soil to be repaired is inputted into indirect type kin by feeder（3）, meanwhile, start indirect type kin（3）、
Vacuum pump（14）, direct-type thermal desorption kiln（5）, combustion decomposition device（7）And circulating pump, control indirect type kin（3）Interior pressure
For negative pressure, indirect type kin is controlled（3）Interior temperature is under current pressure more than the boiling point of water so that the water in soil to be repaired
It is vaporized；
（2）Step will be passed through（1）Dewatered soil is delivered to direct-type thermal desorption kiln（5）It is interior, direct thermal desorption processing is carried out,
So that the high boiling point organic compound in soil is volatized into flue gas, the soil that thermal desorption has been handled is discharged, and carries out subsequent processing；
（3）By step（2）In be mixed with high boiling point organic compound flue gas be sent into combustion decomposition device（7）In, combustion decomposition obtains temperature
For 900 DEG C or more of high-temperature flue gas；
（4）By step（3）In high-temperature flue gas be passed through heat exchanger（8）In, high-temperature flue gas and the cycle come from heating jacket conveying
Medium fully exchanges heat, and obtains the circulatory mediator after low-temperature flue gas and heating, low-temperature flue gas is sent into next step treatment process, after heating
Circulatory mediator be sent into heating jacket carry out next round dehydration.
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