CN110302654A - A kind of flue gas purification system and method applied to thermal desorption in soil remediation - Google Patents
A kind of flue gas purification system and method applied to thermal desorption in soil remediation Download PDFInfo
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- CN110302654A CN110302654A CN201910386339.2A CN201910386339A CN110302654A CN 110302654 A CN110302654 A CN 110302654A CN 201910386339 A CN201910386339 A CN 201910386339A CN 110302654 A CN110302654 A CN 110302654A
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 108
- 239000003546 flue gas Substances 0.000 title claims abstract description 108
- 238000003795 desorption Methods 0.000 title claims abstract description 58
- 238000000746 purification Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000002689 soil Substances 0.000 title claims abstract description 24
- 238000005067 remediation Methods 0.000 title claims abstract description 17
- 239000007789 gas Substances 0.000 claims abstract description 66
- 238000010304 firing Methods 0.000 claims abstract description 50
- 230000009977 dual effect Effects 0.000 claims abstract description 49
- 238000000605 extraction Methods 0.000 claims abstract description 34
- 238000001816 cooling Methods 0.000 claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 23
- 239000007921 spray Substances 0.000 claims description 15
- 229910052799 carbon Inorganic materials 0.000 claims description 14
- 230000007246 mechanism Effects 0.000 claims description 13
- 238000005507 spraying Methods 0.000 claims description 13
- 239000000428 dust Substances 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 10
- 238000001179 sorption measurement Methods 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 9
- 235000019504 cigarettes Nutrition 0.000 abstract description 7
- 238000004064 recycling Methods 0.000 abstract description 7
- 239000002918 waste heat Substances 0.000 abstract description 6
- 239000003344 environmental pollutant Substances 0.000 description 8
- 231100000719 pollutant Toxicity 0.000 description 8
- 229910001385 heavy metal Inorganic materials 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000003517 fume Substances 0.000 description 5
- 239000002957 persistent organic pollutant Substances 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 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 description 4
- 238000004140 cleaning Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 239000003814 drug Substances 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 230000008439 repair process Effects 0.000 description 4
- 239000000047 product Substances 0.000 description 3
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 2
- 229910052925 anhydrite Inorganic materials 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000010882 bottom ash Substances 0.000 description 2
- 239000001110 calcium chloride Substances 0.000 description 2
- 229910001628 calcium chloride Inorganic materials 0.000 description 2
- 235000011148 calcium chloride Nutrition 0.000 description 2
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 2
- 229910001634 calcium fluoride Inorganic materials 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 235000010261 calcium sulphite Nutrition 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000003610 charcoal Substances 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 229960004424 carbon dioxide Drugs 0.000 description 1
- 229910002090 carbon oxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011066 ex-situ storage Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000003802 soil pollutant Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/68—Halogens or halogen compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/81—Solid phase processes
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a kind of flue gas purification systems applied to thermal desorption in soil remediation, including dual firing chamber, level-one heat-exchanger rig, chilling tower, flue gas purification device, the first dust-extraction unit, air-introduced machine, secondary heat exchange device and extracting tower, wherein, the exhaust gas of the discharge of dual firing chamber is successively after the heat exchange of level-one heat-exchanger rig, the cooling of chilling tower, flue gas purification device purification, the first dust-extraction unit dedusting, secondary heat exchange device secondary heat exchange and extracting tower depickling are sequentially entered by pipeline again, finally enter chimney.Flue gas purification system of the invention is purified twice respectively by using flue gas purification device and extracting tower, to guarantee that it is sufficiently cleaned up up to standard that flue gas carries out；And two-part heat exchange is carried out respectively before purification and after purification, and sufficiently realizes that waste heat recycling reduces system energy consumption while to flue gas through cooling down, so that finally the exhaust gas temperature of discharge chimney is mutually suitable for avoiding " cigarette is white " phenomenon with ambient temperature.Correspondingly, the present invention also provides a kind of flue gas purifying methods.
Description
Technical field
The present invention relates to technical field of soil remediation, and in particular to a kind of flue gas applied to thermal desorption in soil remediation is net
Change system and method.
Background technique
With economy upgrading, industry transfer and transition, the industrial lands such as large quantities of steels, chemical industry, solid waste stack field,
Military base etc. is moved from down town area to other areas or suburb, leaves large quantities of contaminated places.In soil
Pollutant be mainly the organic matters such as total petroleum hydrocarbon, polycyclic aromatic hydrocarbon, some soil there are also the pollutant of the heavy metals such as mercury, arsenic, by
Contaminated soil is difficult to restore, and causes damages to agricultural product and human health.In the newest ecological environmental protection planning of country, it is desirable that
In the city of partial contamination plot integrated distribution, specification, orderly carry out redevelopment and administered using pollution plot and repair hydro carbons
Pollutant.In related soil recovery technique, thermal desorption technology have certain advantage, thermal desorption technology refer to by directly or
Heating is connect, the travel notes pollutant in soil is heated to boiling point or more, so that organic pollutant is played from pollution medium,
Into the process of gas handling system, i.e., it mainly includes two basic processes: first is that substance to be processed is heated, by target stains
Object is volatilized into gaseous state separation；Second is that the tail gas containing pollutant the processing such as to be condensed to, collected and burned to heel row up to standard
It puts into atmosphere.Thermal desorption technology includes dystopy thermal desorption and thermal desorption in situ, wherein dystopy thermal desorption technology is then used to handle
It is some be suitable for carry out dystopy environment remediation regions, contaminated soil is extracted and by special thermal desorption system at
Reason.
Dystopy thermal desorption system can be divided into direct thermal desorption and indirect thermal desorption, can also be divided into high temperature thermal desorption and Low Temperature Thermal
Desorption.It mainly include at feed system, desorption system and tail gas currently, generalling use direct thermal desorption in thermal desorption technology
Reason system composition, wherein feed system: by pretreatments such as screening, dehydration, broken, magnetic separation, contaminated soil is transported from workshop
Into desorption system；Desorption system: after contaminated soil enters hot rotary kiln, the direct flame contact generated with hot rotary kiln burner,
It is heated properly the temperature to gasify to target contaminant or more, achievees the purpose that pollutant is separated with soil；Exhaust treatment system:
Enrichment gasification pollutant tail gas by cyclone dust removal, burn, cool, bag-type dust, lye elution etc. links remove tail
Pollutant in gas.
Currently, high using will first be carried out in the incinerator of the flue gas dual firing chamber of thermal desorption usually in exhaust treatment system
Temperature is burned, and then using flue gas heat exchange unit, i.e. air heat exchanger, is quickly cooled to 200 DEG C through chilling tower after recovery waste heat
Hereinafter, after then carrying out gas cleaning using active carbon or calcium hydroxide etc. again, by dust-extraction unit dedusting, then by air-introduced machine by cigarette
Gas is passed through chimney and is discharged.Although after a series of processing such as heat exchange, flue-gas temperature drop to 200 DEG C hereinafter,
Be that the flue-gas temperature that drains into chimney is still higher so that flue gas during throat is discharged into atmosphere because temperature reduces, cigarette
Part vapourous water and pollutant coagulate in gas, form misty steam in throat, misty steam can because of sky background color and
The reasons such as skylight photograph, viewing angle occur color slight change, formed " coloured plume ", usually white, canescence or
The colors such as blue；In addition, tail gas heat quantity is higher, the loss of amount of heat and the waste of the energy are caused, it is de- to increase heat indirectly
The cost of attached recovery technique.
Summary of the invention
For the above technical problems, the present invention provides a kind of gas cleaning applied to thermal desorption in soil remediation
System.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention are as follows:
A kind of flue gas purification system applied to thermal desorption in soil remediation comprising the dual firing chamber that sets gradually, level-one
Heat-exchanger rig, chilling tower, flue gas purification device, the first dust-extraction unit, air-introduced machine, secondary heat exchange device and extracting tower, wherein
The exhanst gas outlet of the dual firing chamber is connected by flue with the level-one heat-exchanger rig, the level-one heat exchange
Device also passes through flue and is connected respectively with the chilling tower and the combustion-supporting air supply line of dual firing chamber/thermal desorption device, institute
It states chilling tower and is connected by flue with the flue gas purification device, the flue gas purification device passes through flue and institute
It states the first dust-extraction unit to be connected, first dust-extraction unit is filled by flue and the air-introduced machine and the secondary heat exchange
It sets and is connected, the secondary heat exchange device also passes through combustion-supporting air feed of the flue respectively with the extracting tower and the dual firing chamber
Pipeline is connected, and the gas outlet of the extracting tower passes through the external chimney of flue.In flue gas purification system of the invention, this two
Grade heat-exchanger rig is respectively communicated to the combustion-supporting air supply line of extracting tower and dual firing chamber by flue, so that exhaust gas is by cooling
Chimney is discharged into after depickling again, thus cigarette Bai Xianxiang caused by avoiding the exhaust gas of discharge and periodic environment temperature difference larger,
Meanwhile the combustion-supporting air supply line by the way that the hot-air after heat exchange to be passed through to dual firing chamber carries out air with the waste heat of recovered flue gas
The combustion air as dual firing chamber is preheated, the loss of amount of heat and the waste of the energy are avoided, thermal desorption is also reduced and repairs skill
The cost of art；On the other hand, level-one heat-exchanger rig is connected to the combustion-supporting air supply line of dual firing chamber by flue and/or heat takes off
The combustion-supporting air supply line of rotary kiln in adsorption device, to further improve the recycling to fume afterheat.Certainly, of the invention
In the cool air inlet of the level-one heat-exchanger rig and secondary heat exchange device can pass through the external cold air feeding mechanism of pipeline respectively, such as
Cold air air-introduced machine.
Wherein, lye spraying mechanism is provided in the chilling tower, the lye spraying mechanism is connected to by atomizer
Lye pond.The present invention by chilling tower access lye spraying mechanism, thus to flue gas carry out fast cooling while, it is right
Flue gas carries out depickling, to achieve the purpose that purifying smoke.
Wherein, the flue gas purification device includes dry type extracting tower and active carbon spray tower, wherein the dry type extracting tower
Air intake be connected with the gas outlet of the chilling tower, the gas outlet of the dry type extracting tower and entering for the active carbon spray tower
Port is connected, and the gas outlet of the active carbon spray tower is connected with the air intake of first dust-extraction unit.The present invention by
Dry type extracting tower is set gradually between chilling tower and the first dust-extraction unit and active carbon spray tower comes respectively to the flue gas after cooling
Depickling and absorption heavy metal, organic matter etc. are carried out, to purify to flue gas, the gas being discharged is up to standard.
Wherein, extracting tower uses wet process extracting tower.Depickling is carried out to flue gas again using wet process depickling in the present invention, is guaranteed
Flue gas is up to standard.
Further, the flue gas purification system further includes the second dust-extraction unit, and the air intake of second dust-extraction unit is logical
The gas outlet that flue is connected to thermal desorption device is crossed, and the gas outlet of second dust-extraction unit is then connected by flue
To the air intake of above-mentioned dual firing chamber.
Preferably, the first dust-extraction unit is bag filter, and the second dust-extraction unit is cyclone dust collectors.
Based on the above-mentioned flue gas purification system for being applied to thermal desorption in soil remediation, the present invention also provides a kind of applications
The flue gas purifying method of thermal desorption in soil remediation comprising step:
The exhaust gas that thermal desorption generates is passed through dual firing chamber and is heated to 850 DEG C -1100 DEG C, obtains high-temperature flue gas；
The high-temperature flue gas is passed through after level-one heat-exchanger rig carries out heat exchange, then through chilling tower is cooled to 150-200 DEG C,
Meanwhile the hot-air after level-one heat-exchanger rig heat exchange being passed through to the combustion-supporting air supply line of dual firing chamber by flue
And/or the combustion-supporting air supply line of thermal desorption device is to preheat combustion-supporting gas；
Flue gas after fast cooling is passed through in flue gas purification device and successively carries out dry type depickling, activated carbon adsorption, first
After dust-extraction unit dedusting, secondary heat exchange device being introduced through air-introduced machine and carries out heat exchange again, it is wet to be then passed through extracting tower progress again
Chimney discharge is passed through after method depickling, meanwhile, the hot-air after secondary heat exchange device heat exchange is passed through by flue
The combustion-supporting air supply line of dual firing chamber is to preheat combustion-supporting gas.
Further, before the exhaust gas that thermal desorption generates is passed through the dual firing chamber, the exhaust gas that thermal desorption generates is passed through
Second dust-extraction unit is dusted.
The invention has the beneficial effects that:
The invention discloses a kind of flue gas purification systems and method applied to thermal desorption in soil remediation, by chilling
Flue gas purification device is arranged between tower and the first dust-extraction unit to purify flue gas for the first time, then deacidifying device is set to flue gas
Double purification is carried out, to the sufficiently cleaned up of flue gas；And the flue gas before purifying exchanges heat by level-one heat-exchanger rig, purified flue gas
Heat exchange is then carried out again by secondary heat exchange device, i.e., two-part heat exchange has been carried out to flue gas, so that into the cigarette of extracting tower
Temperature degree is lower than 100 DEG C, to guarantee that the flue gas being discharged through chimney can be adapted with ambient temperature, and then avoids cigarette
Bai Xianxiang；On the other hand, by the way that the hot-air after secondary heat exchange device heat exchange to be passed through to the combustion-supporting air supply line of dual firing chamber, with
And the hot-air after level-one heat-exchanger rig heat exchange is passed through to the combustion-supporting air duct of rotary kiln in dual firing chamber and/or thermal desorption device
Road realizes the abundant recycling of fume afterheat, reduces the energy consumption of system, reduces the cost of soil remediation indirectly.
Detailed description of the invention
Fig. 1 is a kind of structure applied to an embodiment of the flue gas purification system of thermal desorption in soil remediation of the invention
Schematic diagram.
Specific embodiment
With reference to the accompanying drawing, the present invention is described in detail.
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Embodiment one
It is an a kind of embodiment applied to the flue gas purification system of thermal desorption in soil remediation of the invention referring to Fig. 1
Structural schematic diagram, specifically, the flue gas purification system of the present embodiment includes being sequentially connected by pipeline along flue gas circulating direction
Logical dual firing chamber 11, level-one heat-exchanger rig 12, chilling tower 13, flue gas purification device 14, the first dust-extraction unit 15, air-introduced machine, two
Grade heat-exchanger rig 17 and extracting tower 16, wherein
The exhanst gas outlet of dual firing chamber 11 is connected with the exhaust gas entrance of level-one heat-exchanger rig 12, and level-one heat-exchanger rig 12 passes through
Flue is connected with the combustion-supporting air supply line of rotary kiln in thermal desorption device is connected with chilling tower 13 respectively, and level-one is changed
The cool air inlet of thermal 12 then external cold air feeding mechanism, such as cold air air-introduced machine；Chilling tower 13 passes through flue
It is connected with flue gas purification device 14, flue gas purification device 14 is connected by flue with the first dust-extraction unit 15, and first
Dust-extraction unit 15 is connected by flue, air-introduced machine with the exhaust gas entrance of secondary heat exchange device 17, and secondary heat exchange device 17
Then it is connected respectively with the combustion-supporting air supply line of extracting tower 16 and dual firing chamber by flue, and secondary heat exchange device 17 is cold
The external cold air feeding mechanism of air intake, such as cold air air-introduced machine；Extracting tower 16 is connected to chimney by flue.
In the present embodiment, when the exhaust gas that thermal desorption processing generates enters cyclone dust collectors under the action of exhaust gas air-introduced machine
It is interior so that after cyclone dust collectors remove most of dust in removing exhaust gas, into dual firing chamber's furnace in carry out high temperature incineration so that useless
Temperature degree is increased to 850 DEG C -1100 DEG C, so that the organic pollutant thoroughly eliminated in exhaust gas can sufficiently decompose removal, and not
Dioxin can be generated；And by setting level-one heat-exchanger rig, so that the exhaust gas after burning disposal enters level-one heat-exchanger rig
Waste heat recycling is carried out to save system energy consumption to the exhaust gas of dual firing chamber's discharge while carrying out heat exchange, and the exhaust gas after heat exchange
Into chilling tower 13, i.e., fast cooling is carried out to 200 DEG C using chilling tower 13 and its hereinafter, synthesize temperature again with avoid dioxin
Spend section, prevent the generation of dioxin, then using flue gas purification device, the further dedusting of the first dust-extraction unit after, through drawing
Again through carrying out waste heat recycling while secondary heat exchange device heat exchange to further save system energy consumption after blower extraction, and again
Exhaust gas after heat exchange removes heavy metal, organic pollutant and sour gas in flue gas through extracting tower, finally enters chimney
20, one-part form heat exchange, chilling tower fast cooling are carried out since exhaust gas passes through level-one heat-exchanger rig before cleaning, and after purifying again
It is secondary to carry out two-period form heat exchange by secondary heat exchange device, so that the exhaust gas temperature for eventually entering into chimney is lower, when it is by de-
After acid tower processing, and after chimney is discharged, can with the Acclimation temperature of ambient enviroment, so as to avoid cigarette Bai Xianxiang.
Certainly, the level-one heat-exchanger rig 12 in the present embodiment is also connected to the combustion-supporting air supply line of dual firing chamber, or
It is connected to the combustion-supporting air supply line of dual firing chamber and rotary kiln simultaneously；Similarly, which can also be connected by flue
It is connected to the combustion-supporting air supply line of rotary kiln, alternatively, being connected to the combustion-supporting air supply line of dual firing chamber and rotary kiln simultaneously.
In one embodiment, which is carried out using high-temperature flue gas of the air heat exchanger to dual firing chamber
Heat exchange, and the brethaid is connected with the combustion-supporting air-supply pipeline of dual firing chamber, to utilize the hot-air pair after heat exchange
The combustion air of dual firing chamber is preheated, and to save system energy consumption, and the exhaust gas after the air heat exchanger heat exchange then passes through flue gas
Pipeline is connected to extracting tower；Certainly, the air heat exchanger is with dual firing chamber 11 other than being connected, can also with during thermal desorption
Thermal desorption device, if the combustion-supporting air supply line of rotary kiln is connected, i.e., for preheated air using as the combustion-supporting of thermal desorption device
Wind uses, to save system energy consumption.Correspondingly, air heat exchanger can also be used in level-one heat-exchanger rig, and it passes through flue
It is respectively connected to the combustion-supporting air supply line of chilling tower and thermal desorption device, i.e. hot-air after heat exchange is returned in thermal desorption device
The combustion air of rotary kiln is preheated, and to save system energy consumption, and the exhaust gas after the air heat exchanger heat exchange then passes through fume pipe
Road is passed through chilling tower and is rapidly cooled.
In one embodiment, which is used to carry out fast quickly cooling to the heat exchange flue gas that level-one heat-exchanger rig comes out
But to 150-200 DEG C, to prevent the generation of dioxin, the type of cooling is water-spraying control；Certainly, it can also be set in the chilling tower 13
It is equipped with lye spraying mechanism (including aerial fog nozzle), and the lye spraying mechanism is connected to lye pond by atomizer, thus
While being rapidly cooled to flue gas, depickling processing is carried out.
In one embodiment, which includes dry type extracting tower 141 and active carbon spray tower 142,
Wherein, the air intake of dry type extracting tower 141 is connected with the gas outlet of chilling tower 13, the gas outlet of dry type extracting tower 141 and activity
The air intake of charcoal spray tower 142 is connected, and the gas outlet of active carbon spray tower 142 is connected with the air intake of the first dust-extraction unit 15,
Wherein, which uses depickling medicament (CaO) spraying system, sprays SO2, HCl, HF in flue gas with by atomization
The CaO reaction entered, generates the reaction products such as CaSO4 and CaSO3 and CaCl2 and CaF2, these dry state products are under normal circumstances
Fraction is discharged from dry type extracting tower tower bottom ash discharging hole, and the overwhelming majority enters flue through flue with flue gas and enters through activity
Charcoal spray tower, and heavy metal, the organic pollutant in flue gas are adsorbed by active carbon, i.e., by spraying into stemness depickling medicament
And active carbon, it is ensured that flue gas emission safety compliance.
In one embodiment, which uses bag filter.
In one embodiment, which uses wet process depickling, and specifically, which can be used above-mentioned chilling tower
Structure, i.e., in tower be arranged lye spraying mechanism, and the lye spraying mechanism in the extracting tower pass through pipeline and lye pond phase
Even.
Further, second dust-extraction unit is also set up before dual firing chamber 11, specifically, using cyclone dust collectors.When
So, which may also be arranged between the dual firing chamber and air heat exchanger.
Further, in this embodiment temperature thermocouple and flowmeter etc. are set on pipeline between above-mentioned each equipment, and
Also settable pressure transmitter, regulating valve, stop valve etc. on each pipeline, such as dual firing chamber 11, chilling tower equipment it is corresponding
Regulating valve, stop valve, flowmeter etc. are set on the pipelines such as air supply pipe, liquid supply pipe, and above-mentioned each electrical component is native with organic contamination
Central controller connection in earth ex-situ repair system, to realize the automation control of this repair system, what is be directed to is automatic
Changing control mode can be used existing common automation control method, which is that computer and PLC cooperation etc. are normal
Automation control appliance system.
Further, in order to make full use of waste heat, in the present embodiment, the level-one heat-exchanger rig and secondary heat exchange device are logical
Flue is crossed other than the combustion gas air supply line that can be connected to dual firing chamber, is also connected to the combustion gas air duct of thermal desorption device
Road reduces the energy consumption of system to sufficiently realize flue gas heat recovery.
Embodiment two
Based on above-mentioned flue gas purification system, the present invention also provides a kind of gas cleaning sides applied to soil remediation
Method, specifically, the flue gas purifying method of the present embodiment comprising steps of
The exhaust gas that thermal desorption generates is passed through dual firing chamber and is heated to 950 DEG C -1100 DEG C, obtains high-temperature flue gas by step 1；
Specifically, exhaust gas residence time in the dual firing chamber is greater than 2s；
Step 2, after the high-temperature flue gas generated in step 1 is passed through the progress heat exchange of level-one heat-exchanger rig, then through chilling
Tower is cooled to 150-200 DEG C, while the hot-air after level-one heat-exchanger rig heat exchange being connected to by flue into two
Fire the combustion-supporting air supply line of rotary kiln in the combustion-supporting air supply line and/or thermal desorption device of room；
Step 3, the flue gas after fast cooling in step 3 is passed through in flue gas purification device successively carry out dry type depickling and
Activated carbon adsorption heavy metal and organic matter；
Step 4 after the flue gas in step 3 is passed through the first dust-extraction unit dedusting, enters secondary heat exchange dress through air-introduced machine
After setting heat exchange again, it is passed through after extracting tower carries out wet process depickling and is passed through chimney discharge, meanwhile, it will be by secondary heat exchange device heat
Hot-air after exchange is passed through the combustion-supporting air supply line of dual firing chamber by flue to preheat to combustion-supporting gas.
In one embodiment, the dual firing chamber in step 1 is using the vertical dual firing chamber of square, specification be 3.4m ×
3.4m × 15.0m, and the flue gas that thermal desorption generates residence time in the dual firing chamber is greater than 2s, so that flue gas is heated to 850
DEG C or 1000 DEG C or 1050 DEG C, reach as high as 1100 DEG C.
In one embodiment, the level-one heat-exchanger rig and secondary heat exchange device are all made of air heat exchanger, and by one
Grade heat-exchanger rig is respectively connected to the combustion-supporting air duct of the combustion-supporting air supply line of rotary kiln in thermal desorption device by flue
Road and chilling tower, so that the exhaust gas by heat exchange enters chilling tower and is rapidly cooled in step 2, and after heat exchange
Hot-air then the combustion-supporting gas in the combustion-supporting air supply line of dual firing chamber is preheated, i.e., to flue gas cool-down while also realize
Recycling to fume afterheat；Similarly, the gas vent of secondary heat exchange device is respectively connected to two combustions by flue
To carry out wet process depickling to the flue gas that will be discharged, i.e., the combustion-supporting air supply line of room is to carry out preheating and extracting tower to combustion-supporting gas
Also the recycling to fume afterheat is realized while to flue gas cool-down, reduces system energy consumption.
In one embodiment, dry type depickling and activated carbon adsorption are carried out to the gas after fast cooling in step 3
Step specifically includes: carrying out dry type depickling to flue gas using dry type extracting tower first, i.e., using depickling medicament (CaO) injection system
System reacts SO2, HCl, HF in flue gas with the CaO sprayed by atomization, generates CaSO4 and CaSO3 and CaCl2 and CaF2
Etc. reaction products, these dry state products under normal circumstances fraction from dry type extracting tower tower bottom ash discharging hole be discharged, the overwhelming majority with
Flue gas enters flue through flue；Then, the flue gas after dry type depickling is passed through active carbon spray tower, by active carbon pair
Heavy metal, organic pollutant in flue gas are adsorbed, i.e., respectively by spray into stemness depickling medicament and active carbon to flue gas into
Row purification, it is ensured that flue gas emission safety compliance.
Further, while flue gas in step 2 after heat exchanging carries out fast cooling, can also simultaneously to flue gas into
Row depickling specifically can be by being arranged lye spraying mechanism in chilling tower, and the lye spraying mechanism is connected by atomizer pump
To lye pond, to just be purified for the first time to flue gas before being purified in step 3 to flue gas, i.e. wet process depickling.
Further, the flue gas that can also generate before step 1 to thermal desorption is dusted, and specifically, passes through setting
Flue gas after dedusting after being dusted such as cyclone dust collectors, then is passed through dual firing chamber and burned by the second dust-extraction unit；Certainly,
It can also be arranged after second dust-extraction unit is dusted after dual firing chamber burns and be passed through level-one heat-exchange device progress heat for the first time
Exchange.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (8)
1. a kind of flue gas purification system applied to thermal desorption in soil remediation, which is characterized in that including along flue gas circulating direction
The dual firing chamber that sets gradually, level-one heat-exchanger rig, chilling tower, flue gas purification device, the first dust-extraction unit, air-introduced machine, second level are changed
Thermal and extracting tower, wherein
The exhanst gas outlet of the dual firing chamber is connected by flue with the level-one heat-exchanger rig, the level-one heat-exchanger rig
Also it is connected respectively with the combustion-supporting air supply line of the chilling tower and thermal desorption device by flue, the chilling tower passes through
Flue is connected with the flue gas purification device, and the flue gas purification device is filled by flue and first dedusting
It sets and is connected, first dust-extraction unit is connected by flue and the air-introduced machine with the secondary heat exchange device, institute
It states secondary heat exchange device and also passes through flue and be connected respectively with the combustion-supporting air supply line of the extracting tower and the dual firing chamber,
The gas outlet of the extracting tower passes through the external chimney of flue.
2. flue gas purification system as described in claim 1, which is characterized in that be provided with lye spray thrower in the chilling tower
Structure, the lye spraying mechanism are connected to lye pond by atomizer pump.
3. flue gas purification system as claimed in claim 2, which is characterized in that the flue gas purification device includes dry type extracting tower
With active carbon spray tower, wherein the air intake of the dry type extracting tower is connected with the gas outlet of the chilling tower, and the dry type is de-
The gas outlet of acid tower is connected with the air intake of the active carbon spray tower, the gas outlet of the active carbon spray tower and described first
The air intake of dust-extraction unit is connected.
4. the flue gas purification system as described in any one of claims 1 to 3, which is characterized in that the extracting tower is wet process
Extracting tower.
5. flue gas purification system as claimed in claim 4, which is characterized in that further include being connected to thermal desorption device gas outlet
The gas outlet of second dust-extraction unit, second dust-extraction unit is connected with the air intake of the dual firing chamber.
6. flue gas purification system as claimed in claim 5, which is characterized in that first dust-extraction unit is cyclone dust collectors；
And/or second dust-extraction unit is bag-type dust collector.
7. a kind of flue gas purifying method applied to thermal desorption in soil remediation, which is characterized in that the flue gas purifying method base
In the flue gas purification system as described in any one of claim 1 to 6, then the flue gas purifying method specifically includes step:
The exhaust gas that thermal desorption generates is passed through dual firing chamber and is heated to 850 DEG C -1100 DEG C, obtains high-temperature flue gas；
The high-temperature flue gas is passed through after level-one heat-exchanger rig carries out heat exchange, then through chilling tower is cooled to 150 DEG C -200 DEG C, together
When, the hot-air after level-one heat-exchanger rig heat exchange is passed through to the combustion-supporting air supply line of thermal desorption device by flue
To be preheated to combustion-supporting gas；
Flue gas after fast cooling is passed through in flue gas purification device and successively carries out dry type depickling, the first dedusting of activated carbon adsorption dress
After setting dedusting, it is passed through after air-introduced machine introduces after secondary heat exchange device carries out heat exchange again and is passed through extracting tower progress wet process depickling
Chimney discharge, meanwhile, the hot-air after secondary heat exchange device heat exchange is passed through the combustion-supporting of dual firing chamber by flue
Air supply line is to preheat combustion-supporting gas.
8. flue gas purifying method as claimed in claim 7, which is characterized in that be passed through described two in the exhaust gas for generating thermal desorption
Before firing room, further comprise the steps of:
The exhaust gas that thermal desorption generates is passed through the second dust-extraction unit to be dusted.
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Application publication date: 20191008 |