CN109396171A - The device and method of dystopy and thermal desorption coupling processing contaminated soil in situ - Google Patents
The device and method of dystopy and thermal desorption coupling processing contaminated soil in situ Download PDFInfo
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- CN109396171A CN109396171A CN201811545536.6A CN201811545536A CN109396171A CN 109396171 A CN109396171 A CN 109396171A CN 201811545536 A CN201811545536 A CN 201811545536A CN 109396171 A CN109396171 A CN 109396171A
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- firing chamber
- dual firing
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- contaminated soil
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- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/60—Combinations of devices covered by groups B01D46/00 and B01D47/00
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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)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The present invention relates to contaminated soil processing techniques, it is desirable to provide a kind of device and method of dystopy and thermal desorption coupling processing contaminated soil in situ.The device includes rotary kiln and cyclone dust collectors, and the latter exports the entrance for being connected to dual firing chamber；The exhanst gas outlet of dual firing chamber is divided into two-way: being connected to heating tube all the way for heated well heat supply, another way accesses chilling tower after merging with heated well gas recovery；The top exit of chilling tower is sequentially connected bag filter and eluting column, sets blowdown stack at the top of eluting column；It is equipped with two-phase by heated well and mentions pumping well, discharge outlet is connected to the import of condensing unit；The liquid discharge outlet of condensing unit is connected to water treatment facilities, and gas discharge outlet is then connected to the entrance of dual firing chamber.The polluted underground water and steam that the present invention generates when proposing to thermal desorption in situ are rationally disposed, and are simplified vent gas treatment step, are improved the economic benefit of system；Complicated contaminated site is handled with direct thermal desorption and thermal desorption in situ simultaneously, universality, economy are strong.
Description
Technical field
The present invention relates to contaminated soil processing technique, in particular to a kind of dystopy and thermal desorption technology coupling processing in situ are dirty
Contaminate the device and method of soil.
Background technique
According to statistics, in recent years, China has nearly 60 organic contamination projects to repair using thermal desorption technology, effectively alleviates
Soil contamination problem.Direct thermal desorption technology because its to organic polluted soil site remediation have contaminant removal efficiency it is high,
The advantages that repairing efficiency is short, universality is strong is usually used in repairing the organic contaminations places such as coking, petrochemical industry.But directly heat is de-
Attached technology can not repair underground deep layer contaminated soil.In addition, when using direct thermal desorption rehabilitating soil, due to prevent two
The generation for disliking English, the high-temperature flue gas generated in dual firing chamber is cooled down rapidly.In this process, what high-temperature flue gas contained is a large amount of
Energy utilization efficiency is lower.
Due to long-term industrial production activities and the improper spy for making some places that there is high pollution, high risk of environmental management
Point, pollutant is complicated and many kinds of, and not only soil is contaminated, but also often with underground water pollution.For these pollutions
Place needs to administer by thermal desorption mode in situ.Situ heat treatment technology (ISTT) includes that steam strengthens extractive technique
(SEE), heat transfer technology (TCH) and ohmic heating technology (ERH) etc..These technologies all need to introduce heat into underground be soil,
Underground water and pollutant heating.The raising of subsurface temperature will will lead to the gasification of volatile contaminant, make underground water and organic
Pollutant boiling generates steam.Gas phase (mixture of vapor and gaseous pollutant) can be stripped well capture, on the ground
It is handled.It can be improved if fume afterheat can be made full use of, if being used for the thermal desorption in situ of counterweight Polluted area entire
The efficiency of system.
In summary, the waste heat for finding a kind of high-temperature flue gas when can efficiently use direct thermal desorption carrys out counterweight contaminated site
The device and method for carrying out thermal desorption in situ, realizing seems necessary to the efficient reparation of contaminated site.
Summary of the invention
The technical problem to be solved by the present invention is to overcome deficiency in the prior art, provide a kind of dystopy and in-situ heat is de-
The device and method of attached coupling processing contaminated soil.
In order to solve the above technical problems, solution of the invention is:
The device of a kind of dystopy and thermal desorption coupling processing contaminated soil in situ is provided, including for heating desorption Polluted Soil
The rotary kiln of earth；The device further includes that cyclone dust collectors, dual firing chamber, heating tube, heated well, two-phase mention and take out well, chilling tower, cloth bag
Deduster, eluting column, condensing unit and water treatment facilities；
The entrance of cyclone dust collectors is connected to the gas vent of rotary kiln, and outlet is connected to the entrance of dual firing chamber；Dual firing chamber
Exhanst gas outlet is divided into two-way: being connected to the heating tube for protruding into heating bottom all the way, another way is connected to the bottom inlet of chilling tower；Add
The top exit of hot well is connected to chilling tower bottom entrance, for conveying the flue gas for completing heat exchange；The top exit of chilling tower is successively
Bag filter and eluting column are connected, sets blowdown stack at the top of eluting column；
In the contaminated soil processing plot of setting heated well, it is additionally provided with for capturing vapor and gaseous pollutant mixing
The two-phase of object mentions pumping well, and discharge outlet is connected to the import of condensing unit；The liquid discharge outlet of condensing unit is connected to water treatment facilities,
Gas discharge outlet is then connected to the entrance of dual firing chamber；
Connection between aforementioned each equipment is realized by pipeline to be connected.
In the present invention, the heating tube is vertically arranged in heated well, and multiple temperature are equipped at intervals on the outer wall of heating tube
Detector and pressure detector, for monitoring the temperature and pressure numerical value of different depth soil.
Invention further provides realize dystopy and thermal desorption coupling processing contaminated soil in situ using aforementioned device
Method, comprising the following steps:
(1) heated well being excavated in contaminated soil processing plot and two-phase mentioning pumping well, heating tube is inserted into heated well, nozzle
Positioned at shaft bottom；Remaining equipment is arranged in suitable position, and with piping connection；
(2) contaminated soil on surface layer is sent into rotary kiln to heat, separates organic pollutant with soil；Contain
The tail gas of machine pollutant is sent to cyclone dust collectors removal particulate matter, and tail gas send to dual firing chamber and carries out burning processing；
(3) flue gas of dual firing chamber's discharge is divided into two-way: being wherein sent to heating tube all the way；It is dirty with deep layer in heated well
It is returned after contaminating soil heat exchange from well head, is re-fed into chilling tower after merging with the another way flue gas that dual firing chamber discharges；
Deep layer contaminated soil is after heat exchange, and underground water and volatile contaminant are gasified, the vapor and gaseous state of generation
After pollutant mixture proposes pumping well capture by two-phase, separated by condensing unit；Wherein, liquid portion is sent to water treatment facilities
Carry out conventional water treatment；Gas part is sent to the entrance of dual firing chamber, is burnt after mixing with the tail gas of cyclone dust collectors discharge
Processing；
(4) flue-gas temperature is reduced rapidly with spray water mist in chilling tower, prevents the generation of dioxin；The discharge of chilling tower
Tail gas after bag filter dedusting, send to eluting column；In eluting column, spraying cooling, alkali cleaning and demisting are carried out to tail gas
Processing, flue gas is by smoke stack emission to atmosphere.
In step (2) of the present invention, cyclone dust collectors are used to remove the particulate matter that partial size is greater than 6 μm.
In step (2) of the present invention, the ignition temperature of dual firing chamber is 925~1100 DEG C, the residence time 1~2 second.
In step (3) of the present invention, the temperature of dual firing chamber's exiting flue gas is 900~950 DEG C.
In step (3) of the present invention, the flue gas volume flow to heating tube is sent to account for dual firing chamber's exiting flue gas total flow
10~20%.
In step (4) of the present invention, the inlet temperature of chilling tower is 500~550 DEG C, and outlet temperature is 170~200
℃。
In step (4) of the present invention, bag filter is used to remove the solid particle that partial size is greater than 0.1 μm.
Inventive principle description:
Studies have shown that directly thermal desorption technology processing contaminated soil main removal pollutant the step of generation in dual firing chamber
It is interior.Dual firing chamber uses high temperature oxidation process, and temperature is 925~1100 DEG C (when by flue gas to 900 DEG C or so, to organic dirt
The removal rate of dye object can reach 99.99% or more).High-temperature flue gas is just then passed through chilling tower, rapid cooling prevents two evils
English generates.But high-temperature flue gas has very high heat, is sent directly into the cooling loss that will cause energy in chilling tower, makes whole system
It is inefficient.Therefore, the part high-temperature flue gas of dual firing chamber is led into progress In Situ Heating reparation in heating tube, helps to mention
The efficiency of high system, efficiently utilizes the energy of high-temperature flue gas, while can also administer the heavily contaminated that direct thermal desorption can not be repaired
Place.
Studies have shown that either direct thermal desorption or In Situ Heating desorption, require to the tail after progress soil remediation
Gas is handled, and needs up to standard to discharge.But vent gas treatment, meeting are carried out respectively to direct thermal desorption and thermal desorption in situ
Cause economic cost excessive.Therefore, it is necessary to take condensing unit to condense the steam that two-phase proposes pumping well extraction, from condensation
Export carries out conventional water treatment below device, discharges after up to standard.By the contamination gas extracted by being continued to vent to above condensing unit
Dual firing chamber's high-temperature oxydation removes contained pollutant, saves additional vent gas treatment step, substantially increase the economic benefit of system.
Compared with prior art, the beneficial effects of the present invention are:
1, the polluted underground water and steam generated when the present invention is proposed to thermal desorption in situ is rationally disposed, and tail is simplified
Gas disposal step improves the economic benefit of system；
2, while ensuring that direct thermal desorption process is gone on smoothly, the waste heat of high-temperature flue gas is made full use of, improves system
Efficiency；
3, complicated contaminated site can be handled with direct thermal desorption and thermal desorption in situ simultaneously, universality, economy are strong；
4, apparatus structure is compact, connection and reasonable arrangement, utilization rate of waste heat are high, and the innoxious reparation of soil pollution has been effectively relieved
Predicament.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of apparatus of the present invention.
Appended drawing reference in figure are as follows: 1 rotary kiln；2 cyclone dust collectors；3 dual firing chamber；4 heating tubes；5 heated wells；6 two-phases mention
Take out well；7 chilling towers；8 bag filters；9 eluting columns；10 condensing units；11 water treatment facilities.
Specific embodiment
Present invention is further described in detail with specific embodiment with reference to the accompanying drawing.The following examples can make
The present invention, but do not limit the invention in any way is more fully understood in the professional technician of this profession.
The device of dystopy and thermal desorption coupling processing contaminated soil in situ, including the revolution for heating desorption contaminated soil
Kiln 1, cyclone dust collectors 2, dual firing chamber 3, heating tube 4, heated well 5, two-phase, which mention, takes out well 6, chilling tower 7, bag filter 8, elution
Tower 9, condensing unit 10 and water treatment facilities 11；The entrance of cyclone dust collectors 2 is connected to the gas vent of rotary kiln 1, and outlet connects
To the entrance of dual firing chamber 3；The exhanst gas outlet of dual firing chamber 3 is divided into two-way: being connected to the heating tube 4 for protruding into 5 bottom of heated well all the way, separately
It is connected to the bottom inlet of chilling tower 7 all the way；Heating tube 4 is vertically arranged in heated well 6, is equipped at intervals on the outer wall of heating tube 4
Multiple temperature detectors and pressure detector, for monitoring the temperature and pressure numerical value of different depth soil.The top of heated well 5
Outlet is connected to 7 bottom inlet of chilling tower, for conveying the flue gas for completing heat exchange；The top exit of chilling tower 7 is sequentially connected cloth bag
Deduster 8 and eluting column 9 set blowdown stack at the top of eluting column 9；In the contaminated soil processing plot of setting heated well 5, also set
There is the two-phase for capturing vapor and gaseous pollutant mixture to mention and take out well 6, discharge outlet is connected to the import of condensing unit 10；
The liquid discharge outlet of condensing unit 10 is connected to water treatment facilities, and gas discharge outlet is then connected to the entrance of dual firing chamber 3；Aforementioned each equipment
Between connection by pipeline realize connect.
The method for realizing dystopy and thermal desorption coupling processing contaminated soil in situ using aforementioned device, comprising the following steps:
(1) heated well 5 being excavated in contaminated soil processing plot and two-phase mentioning and takes out well 6, heating tube 4 is inserted into heated well 5,
Nozzle is located at shaft bottom；Remaining equipment is arranged in suitable position, and with piping connection；
(2) contaminated soil on surface layer is sent into rotary kiln 1 to heat, separates organic pollutant with soil；Contain
The tail gas of organic pollutant is sent to particulate matter of the removal partial size of cyclone dust collectors 2 greater than 6 μm, and tail gas send to dual firing chamber 3 and carries out
Burning processing；The ignition temperature of dual firing chamber is 925~1100 DEG C, and the residence time 1~2 second, the temperature of dual firing chamber's exiting flue gas was
900~950 DEG C.
(3) flue gas that dual firing chamber 3 discharges is divided into two-way: being wherein sent to heating tube 4 all the way；It send to the flue gas of heating tube
Volume flow accounts for the 10~20% of dual firing chamber's exiting flue gas total flow.From well after exchanging heat in heated well 5 with deep layer contaminated soil
Mouth returns, and being re-fed into chilling tower 7 after merging with the another way flue gas that dual firing chamber 3 discharges, (temperature of mixed flue gas is 500~550
DEG C or so)；
Deep layer contaminated soil heats target restoring area by way of heat transfer, and the soil moisture is made to be raised to target temperature.
After heat exchange, underground water and volatile contaminant are gasified, and the vapor and gaseous pollutant mixture of generation are mentioned by two-phase
After taking out the capture of well 6, separated by condensing unit 10；Wherein, liquid portion send to water treatment facilities 11 and carries out conventional water treatment；
Gas part is sent to the entrance of dual firing chamber 3, carries out burning processing after mixing with the tail gas that cyclone dust collectors 2 discharge；
(4) flue-gas temperature is reduced rapidly with spray water mist in chilling tower 7, prevents the generation of dioxin；Chilling tower
Inlet temperature is 500~550 DEG C, and outlet temperature is 170~200 DEG C.The tail gas that chilling tower 7 discharges is removed through bag filter 8
After solid particle of the partial size greater than 0.1 μm, send to eluting column 9；In eluting column 9, spraying cooling, alkali cleaning are carried out to tail gas and removed
Mist processing, flue gas is by smoke stack emission to atmosphere.
The verifying for the treatment of effect:
Manufacture and design 2 ton/hours of soil treatment ability of heat in Shanxi Province's coking contaminated soil of site recovery project
Desorption apparatus controls dual firing chamber's export branch road volume flow using flow valve in experimentation, studies different volumes flow to soil
The removal rate of earth organic matter.Wherein contaminated site area is directly proportional to volume flow, and dual firing chamber's exiting flue gas is 900~950 DEG C,
System operation time is 2 weeks.1000 tons of heavily contaminated soil containing benzene homologues and polycyclic aromatic hydrocarbon have been repaired in experimentation altogether, have been handled
Soil reaches scheduled contaminated soil remediation target value afterwards.
Experiments verify that the present invention has, stable, process is simple, high to contaminant removal efficiency, repairing efficiency is short,
The advantages that universality is strong.In terms of existing technologies, fume afterheat can efficiently be utilized using the present invention, is meeting target value
On the basis of further increase efficiency, while reducing the generation of dioxin.Meanwhile the present invention can be set based in the prior art
It is realized for carry out system simple reformation.
Finally it should be noted that the above enumerated are only specific embodiments of the present invention.It is clear that the invention is not restricted to
Above embodiments can also have many variations.Those skilled in the art can directly lead from present disclosure
Out or all deformations for associating, it is considered as protection scope of the present invention.
Claims (9)
1. the device of a kind of dystopy and thermal desorption coupling processing contaminated soil in situ, including for heating returning for desorption contaminated soil
Rotary kiln；It is characterized in that, the device further includes that cyclone dust collectors, dual firing chamber, heating tube, heated well, two-phase mention and take out well, chilling
Tower, bag filter, eluting column, condensing unit and water treatment facilities；
The entrance of cyclone dust collectors is connected to the gas vent of rotary kiln, and outlet is connected to the entrance of dual firing chamber；The flue gas of dual firing chamber
Outlet is divided into two-way: being connected to the heating tube for protruding into heating bottom all the way, another way is connected to the bottom inlet of chilling tower；Heated well
Top exit be connected to chilling tower bottom entrance, for convey complete heat exchange flue gas；The top exit of chilling tower is sequentially connected
Bag filter and eluting column, eluting column top set blowdown stack；
In the contaminated soil processing plot of setting heated well, it is additionally provided with for capturing vapor and gaseous pollutant mixture
Two-phase mentions pumping well, and discharge outlet is connected to the import of condensing unit；The liquid discharge outlet of condensing unit is connected to water treatment facilities, gas
Discharge outlet is then connected to the entrance of dual firing chamber；
Connection between aforementioned each equipment is realized by pipeline to be connected.
2. the apparatus according to claim 1, which is characterized in that the heating tube is vertically arranged in heated well, heating tube
Outer wall on be equipped at intervals with multiple temperature detectors and pressure detector, for monitoring the temperature and pressure number of different depth soil
Value.
3. the method for realizing dystopy and thermal desorption coupling processing contaminated soil in situ using claim 1 described device, feature
It is, comprising the following steps:
(1) heated well is excavated in contaminated soil processing plot and two-phase mentions pumping well, heating tube is inserted into heated well, nozzle is located at
Shaft bottom；Remaining equipment is arranged in suitable position, and with piping connection；
(2) contaminated soil on surface layer is sent into rotary kiln to heat, separates organic pollutant with soil；Containing organic dirt
The tail gas of dye object is sent to cyclone dust collectors removal particulate matter, and tail gas send to dual firing chamber and carries out burning processing；
(3) flue gas of dual firing chamber's discharge is divided into two-way: being wherein sent to heating tube all the way；In heated well with deep layer Polluted Soil
It is returned after earth heat exchange from well head, is re-fed into chilling tower after merging with the another way flue gas that dual firing chamber discharges；
Deep layer contaminated soil is after heat exchange, and underground water and volatile contaminant are gasified, the vapor and gaseous contamination of generation
After object mixture proposes pumping well capture by two-phase, separated by condensing unit；Wherein, liquid portion send to water treatment facilities and carries out
Conventional water treatment；Gas part is sent to the entrance of dual firing chamber, carries out burning processing after mixing with the tail gas of cyclone dust collectors discharge；
(4) flue-gas temperature is reduced rapidly with spray water mist in chilling tower, prevents the generation of dioxin；The tail of chilling tower discharge
Gas is sent after bag filter dedusting to eluting column；In eluting columns, spraying cooling, alkali cleaning and demisting are carried out to tail gas and handled,
Flue gas is by smoke stack emission to atmosphere.
4. according to the method described in claim 3, it is characterized in that, cyclone dust collectors are for removing partial size in the step (2)
Particulate matter greater than 6 μm.
5. according to the method described in claim 3, it is characterized in that, the ignition temperature of dual firing chamber is 925 in the step (2)
~1100 DEG C, the residence time 1~2 second.
6. according to the method described in claim 3, it is characterized in that, in the step (3), the temperature of dual firing chamber's exiting flue gas is
900~950 DEG C.
7. according to the method described in claim 3, it is characterized in that, sending in the step (3) to the flue gas volume stream of heating tube
The 10~20% of Liang Zhan dual firing chamber exiting flue gas total flow.
8. according to the method described in claim 3, it is characterized in that, the inlet temperature of chilling tower is 500 in the step (4)
~550 DEG C, outlet temperature is 170~200 DEG C.
9. according to the method described in claim 3, it is characterized in that, bag filter is for removing partial size in the step (4)
Solid particle greater than 0.1 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811545536.6A CN109396171A (en) | 2018-12-17 | 2018-12-17 | The device and method of dystopy and thermal desorption coupling processing contaminated soil in situ |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811545536.6A CN109396171A (en) | 2018-12-17 | 2018-12-17 | The device and method of dystopy and thermal desorption coupling processing contaminated soil in situ |
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| CN109396171A true CN109396171A (en) | 2019-03-01 |
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ID=65460431
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110252793A (en) * | 2019-05-30 | 2019-09-20 | 中国联合工程有限公司 | The method of contaminated site is repaired before a kind of steel plant are discarded on the spot |
| CN113877950A (en) * | 2021-09-10 | 2022-01-04 | 中铁上海工程局集团市政环保工程有限公司 | System for repairing organic contaminated soil and municipal sludge in linkage manner and using method |
| CN114733895A (en) * | 2022-04-01 | 2022-07-12 | 中冶南方都市环保工程技术股份有限公司 | Pollute soil gas normal position thermal desorption restoration equipment |
| CN115055506A (en) * | 2022-05-13 | 2022-09-16 | 北京建工环境工程咨询有限责任公司 | Contaminated soil remediation system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110252793A (en) * | 2019-05-30 | 2019-09-20 | 中国联合工程有限公司 | The method of contaminated site is repaired before a kind of steel plant are discarded on the spot |
| CN113877950A (en) * | 2021-09-10 | 2022-01-04 | 中铁上海工程局集团市政环保工程有限公司 | System for repairing organic contaminated soil and municipal sludge in linkage manner and using method |
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| CN115055506B (en) * | 2022-05-13 | 2024-04-19 | 北京建工环境工程咨询有限责任公司 | Contaminated soil restoration system |
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