CN102225422B - Double-phase vacuum suction simulation system and simulation method thereof - Google Patents
Double-phase vacuum suction simulation system and simulation method thereof Download PDFInfo
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- CN102225422B CN102225422B CN 201110104798 CN201110104798A CN102225422B CN 102225422 B CN102225422 B CN 102225422B CN 201110104798 CN201110104798 CN 201110104798 CN 201110104798 A CN201110104798 A CN 201110104798A CN 102225422 B CN102225422 B CN 102225422B
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Abstract
The invention discloses a double-phase vacuum suction simulation system and a simulation method thereof, and belongs to the technical field of recovery technology for petroleum environmental pollution. The simulation system comprises: a three dimensional simulation zone, pollution source, a double-phase vacuum suction well, a monitoring well, a suction pump, a fluviograph, a water pump, an air compressor, a steam generator and the like. According to the present invention, a transmission process, a migration process, a conversion process and a biodegradation process of nonaqueous phase liquids of petroleum pollutants in groundwater are simulated through adopting a multiphase and multicomponent simulation method, such that the double-phase vacuum recovery process is effectively simulated, parameter calibration problems during the double-phase vacuum suction technology design process are solved well, a optimal design is ensured. According to the simulation model, objective reality of the underground layer can be reflected more veritably, and pollution status and recovery effect of the soil and the underground water can be well simulated and predicted.
Description
Technical field
The invention belongs to petroleum environments pollution remediation technology field, be specifically related to a kind of two-phase vacuum draw simulation system and analogy method thereof.
Background technology
In recent years, the underground water pollution that causes of petroleum industry has become a serious worldwide environmental problem.Annual because of reasons such as oil exploitation, transportation, storage and accidental leakage cause a large amount of organic pollution entering underground water and soil, ecological environment is done great damage.In these pollution sources, underground organic matter seepage has become a topmost underground pollution source.Often have carcinogenic, teratogenesis, mutagenic " three cause effect " from the pollutant of seepages such as buried tank, underground utilities, oil processing equipment; And in underground water and soil environment, be difficult to remove through the natural degradation process; And the ability long-term accumulated, environment and health are had a strong impact on.Therefore, how effectively the soil of oil pollution and underground water being carried out environment remediation has become and has worked as previous important research focus.
Because oil when leaking into subterranean layer, tends to be present in the form of free phase the surface of water.When the density of nonaqueous phase liquid during greater than the density of water, pollutant will pass surface soil and the water-bearing layer arrives the water proof base plate, i.e. subduction is in underground water, and is and extending transversely along the water proof base plate; When nonaqueous phase liquid density during less than the density of water, the vertical migration of pollutant is obstructed at groundwater level, and along the horizontal wide spread of the groundwater level unsaturation band of water (mainly).Nonaqueous phase liquid can be fettered by pore media for a long time, and its solubility composition also can diffuse in the underground water gradually, thereby becomes a kind of persistent pollution sources.Usual way is only to remove to the pollutant in underground water or the soil.Such consequence is; In case the words that repair system is out of service; The free phase (bound nonaqueous phase liquid) that is positioned at the water surface can move freely at subterranean layer again downstream; And constantly enter into soil and underground water through processes such as dissolving, volatilizations, give underground water and soil causes greatly, lasting pollution.Therefore, how effectively the subterranean layer freedom is handled one of the difficult point that always becomes soil and underground water reparation research in the world and emphasis mutually.Two-phase vacuum draw technology is a kind of brand-new; And be the recovery technique of institute's extensive concern in the world; It can effectively remove the pollutant that exists with forms such as free state, ADSORPTION STATE, solubilised state or gaseous states, and can handle the petroleum pollution that is present in saturated zone and unsaturation band simultaneously.But, also have that a large amount of ins and outs and key link need constantly be studied, improvement and perfect because this Study on Technology still is at the initial stage in the world.Though should technology be applied to the removal of the free phase of underground water petroleum pollution gradually, and obtain effect preferably, also very not enough to the exploitation of the simulation model of this technology.
Because underground system is very complicated, very difficulty is perhaps unpractical often to confirm a suitable recovery technique.Even the recovery scenario that those are quite ripe owing to the complexity of soil and conditions such as ground water regime pollution sources and medium, often can not be adjusted special site condition when being applied to actual site accordingly.Therefore, effectively decision support is vital, particularly need carry out real in-site modeling to the underground transmission of repair process and pollutant.Owing to lack this type of simulation model, thereby can not solve the parameter calibration problem in the design process well; Because whether lack the prediction to the treatment effect under the multiple sight, also just can not guarantee to design is optimum.
Summary of the invention
The object of the present invention is to provide a kind of two-phase vacuum draw simulation system.
The present invention also aims to provide a kind of two-phase vacuum draw simulation system analogy method.
A kind of two-phase vacuum draw simulation system; It is characterized in that said simulation system is made up of three-dimensional simulation district 1, pollution sources 2, air-conditioning 3, water pump 4, water tank 5, water pipe 6, steam generator 7, air compressor 8, header tank 9, petticoat pipe 10, water level meter 11, suction pump 12 and gas-liquid separation device 13; The three-dimensional simulation district is made up of at least one two-phase vacuum draw well, at least one monitor well and contaminated zone; Pollution sources 2 place three-dimensional simulation district 1 one ends; Air-conditioning 3 is positioned at 1 top, three-dimensional simulation district; Water tank 5 connects water pump 4 and water pipe 6; Header tank 9 is connected with water pump 4; Air compressor 8 communicates near an end in contaminated zone with three-dimensional simulation district 1 respectively with steam generator 7; Water tank 5 outlet spouts are divided at least one path and communicate near an end in contaminated zone with three-dimensional simulation district 1; The water level meter is arranged at the two ends in three-dimensional simulation district 1; Suction pump 12 links to each other with two-phase vacuum draw well; Gas-liquid separation device 13 links to each other with suction pump 12.
1 occupation of land of said three-dimensional simulation district is of a size of: long 3.6m, wide 1.2m, high 1.4m; Three-dimensional simulation district 1 is divided into 300 grids, and each size of mesh opening is: long 0.09m, wide 0.08m.
Said three-dimensional simulation district soil horizon is divided into 4 layers, is followed successively by ground floor soil, second layer soil, the 3rd layer of soil, the 4th layer of soil from top to down; Ground floor soil constituent is clay, and second layer soil constituent is clay and sandy clay loam, and the 3rd layer of soil constituent is clay, sandy clay loam and sand, and the 4th layer of soil constituent is sand.
A kind of two-phase vacuum draw simulation system analogy method is characterized in that, comprises the steps:
A, unlatching air-conditioning 3, temperature constant in the control room;
B, add from contaminated zone middle part as pollution sources with 30L gasoline, through the diffusion of 3 day time, the contaminated zone spreads out on the underground water surface;
C, with running water with every day 20L speed pump into the three-dimensional simulation district through water pump 4, the flowing naturally of simulated groundwater;
D, the relative thicker place of layout two-phase vacuum draw well oil reservoir around pollution sources;
E, since the 4th day; Start steam generator 7 and air compressor 8, the air compressor import is an atmospheric pressure, and the outlet average pressure remains on 0.6-0.7MPa; Air compressor moves continuously; Carry out aeration to the three-dimensional simulation district, increase the porosity of soil in the three-dimensional simulation district, thereby strengthen flowing of organic pollution.Steam generator is used to adjust the soil interior humidity;
F, since the 4th day, open suction pump 12 simultaneously, drive the two-phase vacuum pick-up system, system is in service, suction pump is at negative pressure-0.3 H
2Under the O condition; Operation is 30 days continuously; Gas phase in the petroleum pollution district and liquid phase petroleum-type pollutant are drawn into ground surface through two-phase vacuum draw well, enter into gas-liquid separation device 13 and isolate gas phase and liquid phase, isolated gas phase can connect the discarded retracting device of tradition and handle; Isolated liquid phase comprises water and waste oil, can connect traditional oil-containing waste water treating device and handle, and handles the water of removing waste oil in the back and can supply return three-dimensional simulation district underground water;
G, at system's run duration, take water sample from monitor well, distribute and thickness the concentration of the gas phase in soil and the underground water, water and oil phase according to taking water sample to measure oil reservoir;
H, exploitation two-phase vacuum draw simulation system numerical simulator, transmission, migration and the conversion of nonaqueous phase stream in the simulated groundwater, and biodegradation process;
I, utilize the Monitoring Data of pilot test system, the comprehensive two-phase vacuum draw simulation system numerical simulator of checking and calibration exploitation.
Beneficial effect of the present invention: the present invention effectively solves the parameter calibration problem in the two-phase vacuum pick-up system design process; Adopt multinomial flow model, effectively transmission, migration and the conversion of nonaqueous phase flowstone oil contaminants in the simulated groundwater, and biodegradation process are for design, exploitation and the operation of two-phase vacuum pick-up system provides effective decision support; Through simulate predict with assess different geological conditions under the operational effect of different two-phase vacuum draw art designs schemes, instruct design and improve the scientific decision tenability; Through simulation and optimization, guarantee under the prerequisite that minimum systematic running cost is used, to realize maximum remediation efficiency to two-phase vacuum draw technical operation process; With compare based on the analytical method of experience at present, this simulation model can reflect the objective reality of subterranean layer more really, better simulation, prediction soil and underground water pollution situation and repairing effect.
Description of drawings
Fig. 1 two-phase vacuum draw simulation system structural representation;
Among the figure, 1-three-dimensional simulation district, 2-pollution sources, 3-air-conditioning, 4-water pump, 5-water tank, 6-water pipe, 7-steam generator, 8-air compressor, 9-header tank, 10-petticoat pipe, 11-water level meter, 12-suction pump, 13-gas-liquid separation device.
Fig. 2 two-phase vacuum pick-up system three-dimensional simulation district floor map;
Among the figure, 2-pollution sources, 14-vacuum draw well, 15-monitor well, 16-contaminated zone; The direction of arrow is the subsurface flow direction.
Fig. 3 two-phase vacuum pick-up system three-dimensional simulation district soil texture;
Among the figure, 17-ground floor soil, 18-second layer soil, the 3rd layer of soil of 19-, the 4th layer of soil of 20-, 21-clay, 22-sandy clay loam, 23-sand; The direction of arrow is the subsurface flow direction.
Fig. 4 two-phase vacuum pick-up system three-dimensional simulation district grid is divided;
Among the figure, 24-vacuum draw well location is put; The direction of arrow is the subsurface flow direction.
The specific embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is further specified.
Set up a cover disposal ability in Canadian Univ Regina year May in November, 2005 to 2007 is 12m
3/ s; Be used for the two-phase vacuum draw simulation system of oil pollution groundwater treatment, this system is made up of three-dimensional simulation district 1, pollution sources 2, air-conditioning 3, water pump 4, water tank 5, water pipe 6, steam generator 7, air compressor 8, header tank 9, petticoat pipe 10, water level meter 11, suction pump 12 and gas-liquid separation device 13; The three-dimensional simulation district is made up of at least one two-phase vacuum draw well 14, at least one monitor well 15 and contaminated zone 16; Pollution sources 2 place three-dimensional simulation district 1 one ends; Air-conditioning 3 is positioned at 1 top, three-dimensional simulation district; Water tank 5 connects water pump 4 and water pipe 6; Header tank 9 is connected with water pump 4; Air compressor 8 communicates near an end in contaminated zone with three-dimensional simulation district 1 respectively with steam generator 7; Water tank 5 outlet spouts are divided at least one path and communicate near an end in contaminated zone with three-dimensional simulation district 1; Water level meter 11 is arranged at the two ends in three-dimensional simulation district 1; Suction pump 12 links to each other with two-phase vacuum draw well; Gas-liquid separation device 13 links to each other with suction pump 12.
1 occupation of land of three-dimensional simulation district is of a size of: long 3.6m, wide 1.2m, high 1.4m; Three-dimensional simulation district 1 is divided into 300 grids, and each size of mesh opening is: long 0.09m, wide 0.08m.
Three-dimensional simulation district 1 soil horizon is divided into 4 layers, is followed successively by ground floor soil, second layer soil, the 3rd layer of soil, the 4th layer of soil from top to down; Ground floor soil constituent is clay, and second layer soil constituent is clay and sandy clay loam, and the 3rd layer of soil constituent is clay, sandy clay loam and sand, and the 4th layer of soil constituent is sand.
Three-dimensional simulation district 1 be used for reflecting with physical analogy oil organic pollution free mutually, transmission course and rule in gas phase and the dissolving mutually; Two-phase vacuum draw well is used for aspirating, removal gas phase and free petroleum pollution mutually; The water level meter is used for the degree of depth of water in the monitoring reaction device; Monitor well is used for collection soil and sampling of ground water, detects groundwater level, pollutant levels, the underground distribution of reflection pollutant; Suction pump is used under the vacuum environment condition, extracts the petroleum pollution that contains gas phase and liquid phase; Air compressor is the underground air that blasts, for increasing soil porosity and providing oxygen that power is provided; Steam generator is used for controlling soil moisture.
This two-phase vacuum draw simulation system analogy method, carry out according to following steps:
A, unlatching air-conditioning 3, temperature constant in the control room;
B, add from contaminated zone middle part as pollution sources with 30L gasoline, through the diffusion of 3 day time, the contaminated zone spreads out on the underground water surface;
C, with running water with every day 20L speed pump into the three-dimensional simulation district through water pump 4, the flowing naturally of simulated groundwater;
D, the relative thicker place of layout two-phase vacuum draw well oil reservoir around pollution sources;
E, since the 4th day, start steam generator 7 and air compressor 8, the air compressor import is an atmospheric pressure; The outlet average pressure remains on 0.6-0.7MPa; Air compressor moves continuously, carries out aeration to the three-dimensional simulation district, increases the porosity of soil in the three-dimensional simulation district; Thereby strengthen flowing of organic pollution, steam generator is used to adjust the soil interior humidity;
F, since the 4th day, open suction pump 12 simultaneously, drive the two-phase vacuum pick-up system, system is in service, suction pump is at negative pressure-0.3 H
2Under the O condition; Operation is 30 days continuously; Gas phase in the petroleum pollution district and liquid phase petroleum-type pollutant are drawn into ground surface through two-phase vacuum draw well, enter into gas-liquid separation device 13 and isolate gas phase and liquid phase, isolated gas phase can connect the discarded retracting device of tradition and handle; Isolated liquid phase comprises water and waste oil, can connect traditional oil-containing waste water treating device and handle, and handles the water of removing waste oil in the back and can supply return three-dimensional simulation district underground water;
G, at system's run duration, take water sample from monitor well, distribute and thickness the concentration of the gas phase in soil and the underground water, water and oil phase according to taking water sample to measure oil reservoir;
H, exploitation two-phase vacuum draw simulation system numerical simulator, transmission, migration and the conversion of nonaqueous phase stream in the simulated groundwater, and biodegradation process;
I, utilize the Monitoring Data of pilot test system, the comprehensive two-phase vacuum draw simulation system numerical simulator of checking and calibration exploitation.
Claims (4)
1. two-phase vacuum draw simulation system; It is characterized in that said simulation system is made up of three-dimensional simulation district (1), pollution sources (2), air-conditioning (3), water pump (4), water tank (5), water pipe (6), steam generator (7), air compressor (8), header tank (9), petticoat pipe (10), water level meter (11), suction pump (12) and gas-liquid separation device (13); The three-dimensional simulation district is made up of at least one two-phase vacuum draw well, at least one monitor well and contaminated zone; Pollution sources (2) place three-dimensional simulation district (1) one end; Air-conditioning (3) is positioned at top, three-dimensional simulation district (1); Water tank (5) connects water pump (4) and water pipe (6); Header tank (9) is connected with water pump (4); Air compressor (8) and steam generator (7) communicate with three-dimensional simulation district (1) end near the contaminated zone respectively; Water tank (5) outlet spout is divided at least one path and communicates with three-dimensional simulation district (1) end near the contaminated zone; The water level meter is arranged at the two ends of three-dimensional simulation district (1); Suction pump (12) links to each other with two-phase vacuum draw well; Gas-liquid separation device (13) links to each other with suction pump (12).
2. according to the said a kind of two-phase vacuum draw simulation system of claim 1, it is characterized in that said three-dimensional simulation district (1) occupation of land is of a size of: long 3.6m, wide 1.2m, high 1.4m; Three-dimensional simulation district (1) is divided into 300 grids, and each size of mesh opening is: long 0.09 m, wide 0.08m.
3. according to the said a kind of two-phase vacuum draw simulation system of claim 1, it is characterized in that said three-dimensional simulation district soil horizon is divided into 4 layers, be followed successively by ground floor soil, second layer soil, the 3rd layer of soil, the 4th layer of soil from top to down; Ground floor soil constituent is clay, and second layer soil constituent is clay and sandy clay loam, and the 3rd layer of soil constituent is clay, sandy clay loam and sand, and the 4th layer of soil constituent is sand.
4. a two-phase vacuum draw simulation system analogy method is characterized in that, comprises the steps:
A, unlatching air-conditioning (3), temperature constant in the control room;
B, add from contaminated zone middle part as pollution sources with 30L gasoline, through the diffusion of 3 day time, the contaminated zone spreads out on the underground water surface;
C, with running water with every day 20L speed pump into the three-dimensional simulation district through water pump (4), the flowing naturally of simulated groundwater;
D, the relative thicker place of layout two-phase vacuum draw well oil reservoir around pollution sources;
E, since the 4th day, start steam generator (7) and air compressor (8), the air compressor import is an atmospheric pressure; The outlet average pressure remains on 0.6-0.7 MPa; Air compressor moves continuously, carries out aeration to the three-dimensional simulation district, increases the porosity of soil in the three-dimensional simulation district; Thereby strengthen flowing of organic pollution, steam generator is used to adjust the soil interior humidity;
F, since the 4th day, open suction pump (12) simultaneously, drive the two-phase vacuum pick-up system, system is in service, suction pump is at negative pressure 0.3 mH
2Under the O condition; Operation is 30 days continuously; Gas phase in the petroleum pollution district and liquid phase petroleum-type pollutant are drawn into ground surface through two-phase vacuum draw well, enter into gas-liquid separation device (13) and isolate gas phase and liquid phase, isolated gas phase connects the discarded retracting device of tradition and handles; Isolated liquid phase comprises water and waste oil, connects traditional oil-containing waste water treating device and handles, and handles the water supply of removing waste oil in the back and returns three-dimensional simulation district underground water;
G, at system's run duration, take water sample from monitor well, distribute and thickness the concentration of the gas phase in soil and the underground water, water and oil phase according to taking water sample to measure oil reservoir;
H, exploitation two-phase vacuum draw simulation system numerical simulator, transmission, migration and the conversion of nonaqueous phase stream in the simulated groundwater, and biodegradation process;
I, utilize the Monitoring Data of pilot test system, the comprehensive two-phase vacuum draw simulation system numerical simulator of checking and calibration exploitation.
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| CN102426225B (en) * | 2011-10-31 | 2015-01-07 | 青岛理工大学 | Experimental device and monitoring method for researching arsenic transformation of underground water |
| CN102921718B (en) * | 2012-10-30 | 2014-02-26 | 华北电力大学 | Two-phase vacuum suction device with auxiliary chemical leaching and method for repairing soil thereof |
| CN103302089B (en) * | 2013-07-01 | 2015-05-20 | 上海格林曼环境技术有限公司 | Integrated type multifunctional movable soil underground water repairing equipment and application thereof |
| CN104833788B (en) * | 2014-12-26 | 2023-09-29 | 中国科学院武汉岩土力学研究所 | Polluted soil restoration process simulation test system |
| CN104569322B (en) * | 2015-02-15 | 2016-02-10 | 中国地质科学院水文地质环境地质研究所 | A kind of construction method of groundwater dynamic simulation experiment platform |
| CN106607453A (en) * | 2017-01-20 | 2017-05-03 | 北京佳业佳境环保科技有限公司 | Environmental risk preventing and controlling and contaminated site repair method for gasoline station |
| CN110410526A (en) * | 2019-08-06 | 2019-11-05 | 谢德泳 | A kind of oil pulse formula suction petroleum emergency processing equipment |
| CN112718830B (en) * | 2020-12-09 | 2023-03-21 | 森特士兴集团股份有限公司 | Soil and groundwater restoration simulation system based on in-situ steam injection |
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| US5050676A (en) * | 1989-09-27 | 1991-09-24 | Xerox Corporation | Process for two phase vacuum extraction of soil contaminants |
| CN101898198A (en) * | 2009-05-27 | 2010-12-01 | 中国石油天然气集团公司 | Method for remedying oil pollution by unitedly using air shatter crack and microorganism and device thereof |
| CN101921023A (en) * | 2009-06-17 | 2010-12-22 | 中国石油天然气集团公司 | Gas breaking and gas stripping linked double-phase vacuum underground water pumping in-situ repair method |
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Patent Citations (3)
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|---|---|---|---|---|
| US5050676A (en) * | 1989-09-27 | 1991-09-24 | Xerox Corporation | Process for two phase vacuum extraction of soil contaminants |
| CN101898198A (en) * | 2009-05-27 | 2010-12-01 | 中国石油天然气集团公司 | Method for remedying oil pollution by unitedly using air shatter crack and microorganism and device thereof |
| CN101921023A (en) * | 2009-06-17 | 2010-12-22 | 中国石油天然气集团公司 | Gas breaking and gas stripping linked double-phase vacuum underground water pumping in-situ repair method |
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