CN112718830A - Soil and groundwater restoration simulation system based on in-situ steam injection - Google Patents
Soil and groundwater restoration simulation system based on in-situ steam injection Download PDFInfo
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- CN112718830A CN112718830A CN202011435059.5A CN202011435059A CN112718830A CN 112718830 A CN112718830 A CN 112718830A CN 202011435059 A CN202011435059 A CN 202011435059A CN 112718830 A CN112718830 A CN 112718830A
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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
- B09C1/002—Reclamation of contaminated soil involving in-situ ground water treatment
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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
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a soil and underground water restoration simulation system based on in-situ steam injection, which comprises a sand box, an extraction pipe, a tail gas treatment device and a control device, wherein one end of the extraction pipe is inserted into soil to be restored in the sand box, the other end of the extraction pipe is connected with the tail gas treatment device, the internal space of the sand box is divided into an upper water area, a soil area and a lower water area, the upper water area and the lower water area are respectively positioned at two sides of the soil area, the upper water area and the lower water area are separated by a partition plate with a filter hole, a steam injection pipe connected with a steam generator is arranged in the soil area, a steam meter is arranged at the inlet of the steam injection pipe, and the steam generator and the tail gas treatment device are respectively and electrically connected with the. The invention can verify the soil temperature rise under different steam parameter injection conditions, verify the pollutant removal effect through the tail gas treatment device, obtain the operation parameters of in-situ steam injection under different working conditions, provide key technical parameters for actual repair engineering and avoid over-design or under-design problems.
Description
Technical Field
The invention relates to the technical field of soil remediation, in particular to a soil and underground water remediation simulation system based on in-situ steam injection.
Background
The 'soil cleaning' work is one of three big environmental protection attack and solidness wars in China and is an important component for building beautiful China. With the promulgation and implementation of the soil pollution prevention and control law, the soil pollution prevention and control work is paid unprecedented attention at present. The contaminated soil remediation mode comprises in-situ remediation and ex-situ remediation, the ex-situ remediation relates to construction defects such as earthwork excavation, soil transfer and temporary storage, and the current soil in-situ heat treatment gradually becomes a hotspot technology for organic contaminated soil remediation.
The in-situ thermal desorption is a soil remediation method which promotes the volatilization of pollutants by heating soil and performs centralized treatment on the pollutants, and according to different heating modes, the commonly used in-situ thermal desorption comprises three types of heat conduction, resistance heating and steam heating, wherein the heat conduction comprises electric heating heat conduction and fuel gas heating heat conduction. The heat conduction has the advantage of high heating temperature, but has the disadvantages of high energy consumption and high modification cost. The steam-enhanced vapor extraction is to utilize steam as a heat source to heat soil to promote desorption of organic pollutants, and simultaneously combine a vapor extraction technology to realize removal of the soil pollutants.
Due to the fact that hydrogeology of a polluted site is complex, the homogeneity of polluted soil is poor, an ideal heat transfer model is used for simulating heating conditions and heating effects, simulation results are often distorted, and errors are large. At present, the work of soil in-situ heat treatment process design, heating well arrangement and the like is often determined according to repair experience, so that the defect of over-design or under-design can exist, and the defects of high construction cost and long period exist when the field pilot test work is carried out. Before the restoration project is carried out, the key heating design parameters are obtained to be particularly important, an in-situ heat treatment experimental device based on the original pollution site conditions is developed based on the design, the optimized important parameters such as heating time, heating temperature and heating well spacing are provided, and technical support is provided for the heating process.
Disclosure of Invention
Therefore, the invention provides a soil and underground water restoration simulation system based on in-situ steam injection, which can simulate different heating conditions of soil according to different soil environments and verify the extraction decontamination effect, can avoid the defects of over-design or insufficient design of constructors according to the simulation system, and achieves the aim of acquiring parameters such as key heating design before restoration engineering is carried out.
In order to achieve the purpose, the invention adopts the following technical scheme:
the in-situ steam injection-based soil and underground water remediation simulation system comprises a sand box, an extraction pipe, a tail gas treatment device and a control device, wherein one end of the extraction pipe is inserted into soil to be remediated in the sand box, the other end of the extraction pipe is connected with the tail gas treatment device, the inner space of the sand box is divided into a water feeding area, a soil area and a water discharging area, the water feeding area and the water discharging area are respectively located on two sides of the soil area and are separated by a partition plate with a filter hole, a steam injection pipe connected with a steam generator is arranged in the soil area, a steam meter is arranged at the inlet of the steam injection pipe, and the steam generator and the tail gas treatment device are respectively and electrically connected with the control device.
The soil area is filled with sandy soil or fine sand and is used for forming a saturated zone environment; soil media such as plain filling soil, silt or clay are filled above the sandy soil or the fine sand and are used for forming an aeration zone environment, and the steam injection pipe is inserted into a saturated zone environment or an aeration zone environment in the soil area.
The ratio of the soil height of the saturated zone environment to the soil height of the aeration zone environment is 10:1 to 1: 1.
Preferably, the extraction pipe is a perforated pipe, a metal screen is wound outside the extraction pipe, and meshes of the metal screen are smaller than holes in the extraction pipe.
The aperture of the metal screen is less than 1 mm.
Further, the outer side face of the sand box is coated with an insulation board, and a blocking layer covers the soil area.
And a thermocouple for observing the temperature rise condition of the soil is also inserted into the soil in the soil area, and the control device is electrically connected with the thermocouple.
The tail gas treatment device comprises a gas-liquid separator, a condenser, a refrigerator, a fan and an activated carbon tank, the extraction pipe is sequentially connected with the gas-liquid separator, the condenser, the fan and the activated carbon tank, and the refrigerator is connected with the condenser.
The sand box is characterized in that the water feeding area is connected with the water tank through a water inlet pipe, the bottom of the sand box is also provided with a water outlet pipe communicated with the water discharging area, and the water outlet pipe is provided with an adjusting valve.
The sand box is made of carbon steel, and the extraction pipe is made of stainless steel.
The technical scheme of the invention has the following beneficial effects:
A. the soil and underground water restoration simulation system provided by the invention can verify the temperature rise of soil under different steam parameters (pressure, temperature, flow and the like) injection conditions, can verify the removal effect of pollutants through the tail gas treatment device, is used for obtaining the operation parameters of in-situ steam injection under different working conditions, and provides key technical parameters for actual restoration engineering, thereby avoiding the problem of over-design or under-design.
B. The simulation system can simulate the situation of a polluted site under different hydrological conditions, such as underground water flow rate, water-containing media and the like, analyze the using effect of the steam injection in-situ thermal desorption technology, and effectively reduce the cost.
C. The simulation system can analyze the soil heating law of heating different types of soil, and provides key parameters such as a heating strategy, a heating well interval, a heating period, a heating temperature, extraction conditions and the like for developing the actual repair engineering.
D. The simulation system provided by the invention can be used for in-situ remediation of soil and underground water in a polluted site, avoids soil excavation and transportation, reduces secondary pollution, and reduces the defects of high energy consumption and high cost such as heat conduction and resistance heating by adopting a steam heating mode.
E: the invention can automatically control the water flow input by feeding water, is used for simulating different hydrogeological scenes and has wide simulation application range.
Drawings
In order to more clearly illustrate the embodiments of the present invention, the drawings which are needed to be used in the embodiments will be briefly described below, and it is apparent that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained from the drawings without inventive labor to those skilled in the art.
Fig. 1 is a schematic diagram of the overall structure of the simulation system provided by the present invention.
Description of reference numerals:
1-flask
11-upper water zone, 12-soil zone, 13-lower water zone
2-extraction tube
3-tail gas treatment device
31-a gas-liquid separator, 32-a condenser, 33-a refrigerator, 34-a fan and 35-an activated carbon tank;
4-a control device; 5-a separator; 6-a steam generator; 7-a steam injection pipe;
8-a steam meter; 9-a metal screen; 10-a heat-insulating plate; 20-a barrier layer;
30-a thermocouple; 40-a water tank; 50-water outlet pipe; 60-adjusting valve;
a-saturated zone environment; b-air-entrained environment.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the system or element being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in figure 1, the invention provides a soil and underground water restoration simulation system based on in-situ steam injection, which comprises a sand box 1, an extraction pipe 2, an exhaust gas treatment device 3 and a control device 4, wherein one end of the extraction pipe 2 is inserted into soil to be restored in the sand box 1, the other end of the extraction pipe is connected with the exhaust gas treatment device 3, the internal space of the sand box 1 is divided into an upper water area 11, a soil area 12 and a lower water area 13, the upper water area 11 and the lower water area 13 are respectively positioned at two sides of the soil area 12 and are separated by a partition plate 5 with a filter hole, a steam injection pipe 7 connected with a steam generator 6 is arranged in the soil area 12, a steam meter 8 is arranged at the inlet of the steam injection pipe 7, and the steam generator 6 and the exhaust gas treatment device 3 are respectively and electrically connected with the control device 4. The control device is used for setting the highest heating temperature, the heating time and the steam injection amount of the steam generator 6, and controlling the steam temperature, the steam flow and the heating time.
According to the invention, according to the condition of simulating soil remediation, sand or fine sand can be filled in the soil area 12 to form a saturated zone environment a; soil media such as plain filling soil, silt or clay are filled above the sandy soil or the fine sand to form an aeration zone environment b, and the steam injection pipe 7 is inserted into a saturated zone environment a or the aeration zone environment b in the soil area 12.
The sand box 1 is used for simulating the environment of underground water and underground soil, the matrix of the sand box 1 is made of carbon steel (corrosion phenomenon caused by underground environment condition is avoided), the sand box 1 is of a three-dimensional structure, a water feeding area 11 is a water storage section and is used as a water storage tank, the upper stream of the simulated underground water is provided with a water inlet device such as a water tank 40 and the like at the upper end; the soil area 12 is a soil medium for simulating heating restoration and is used for installing the extraction pipe 2, the steam injection pipe 7 and the like; the drainage zone 13 is used as a drainage section for simulating the downstream of underground water, a drainage pipe 50 is arranged at the bottom of the drainage zone 13, and an adjusting valve 60 is arranged on the drainage pipe 50 to ensure the stability of a water head. The upper water area 11 and the lower water area 13 are both separated from the soil area 12 by a stainless steel perforated partition 5, the aperture on the partition 5 being less than 1 mm. The polyethylene foam heat-insulation plate 10 is preferably arranged on the outer side of the whole sand box 1, so that heat loss is reduced, and the barrier layer 20 is arranged at the top of the soil area, so that heat loss can be well prevented. Meanwhile, the groundwater seepage speed can be controlled from the liquid level difference between the upper water area 11 and the lower water area 13, and the height of the saturated zone environment a in the invention is preferably consistent with the height of the water stored in the upper water area 11.
The invention preferably provides that the ratio of the soil height of the saturated zone environment a to the soil height of the aeration zone environment b is 10: 1-1: 1, preferably 1:1 set.
In order to prevent soil particles from being sucked into the extraction pipe, the extraction pipe 2 adopted by the invention is a stainless steel perforated pipe, and a metal screen 9 is wound on the outer side of the extraction pipe 2 to prevent the soil particles from entering the extraction pipe. The extraction pipe is connected with a fan at the back to ensure that a negative pressure environment (300Pa-2000Pa) is formed for the waste gas generated by heating to enter the tail gas treatment device.
The mesh of the metal screen 9 is smaller than the holes of the extraction tube 2, and the metal screen is commercially available, and the structure thereof will not be described in detail. The aperture of the metal screen 9 is less than 1 mm.
The soil heating in the invention adopts a steam injection mode. An in-situ thermal desorption steam injection pipe 7 is arranged in the middle of a soil area 12 of the sand box 1, and the steam injection pipe 7 is used for heating soil and promoting the volatilization of organic pollutants. The steam injection pipe 7 is preferably a stainless steel pipe, the steel pipe is provided with a hole (or a slit), and the steam injection pipe 7 can be inserted into a saturated zone environment a or an aeration zone environment b for simulating different types of applicable scenes. The steam injection pipe 7 is connected with the steam generator 6, the steam outlet end of the steam generator 6 (namely the air inlet end of the steam injection pipe 7) is provided with a steam meter 8, the steam usage is adjusted according to the working condition, and the influence of different steam injection amount/injection temperature on the heating effect, the heat transfer effect and the removal of the polluted area is verified.
In order to facilitate the detection of the temperature of the soil area, a thermocouple 30 for observing the temperature rise condition of the soil is further inserted into the soil in the soil area 11, the control device 4 is electrically connected with the thermocouple 30, a display screen can be arranged on the control device 4 to display the temperature rise, the steam flow, the pressure and other parameters of the soil area, the steam flow, the pressure and other parameters of the steam generator can be adjusted according to the temperature rise condition of the soil temperature, and the simulation of different heating conditions is realized.
The bottom of the sand box 1 is also provided with a water outlet pipe 50 communicated with the drainage area 13, and the water outlet pipe 50 is provided with an adjusting valve 60.
The tail gas treatment device 3 shown in fig. 1 comprises a gas-liquid separator 31, a condenser 32, a refrigerator 33, a fan 34 and an activated carbon tank 35, wherein the extraction pipe 2 is sequentially connected with the gas-liquid separator 31, the condenser 32, the fan 34 and the activated carbon tank 35, and the refrigerator 33 is connected with the condenser 32. High-temperature waste gas collected by the extraction pipe 2 firstly enters the gas-liquid separator 31, easily condensed components become liquid and are collected by a device below the condensation pipe, the components which are not easily condensed enter the condenser 32 for further separation, the condenser 32 is an indirect condensation pipe and is connected with the refrigerating machine 33, and the refrigerating machine 33 is a circulating water refrigerating machine. The rest non-condensable gas is further removed through the subsequent activated carbon canister 35, ensuring no secondary pollution. Meanwhile, the pressure and the flow of the exhaust gas discharged from the activated carbon canister 35 can be monitored, the working condition of the exhaust gas can be known, and no secondary pollution is ensured.
The steam generator and the tail gas treatment device adopt the prior art, specific matching parameters can be selected according to a simulation experiment, and the details of the devices or the devices are not repeated.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are intended to be within the scope of the invention.
Claims (9)
1. A soil and underground water restoration simulation system based on in-situ steam injection comprises a sand box (1), an extraction pipe (2), an exhaust gas treatment device (3) and a control device (4), wherein one end of the extraction pipe (2) is inserted into soil to be restored inside the sand box (1), the other end of the extraction pipe is connected with the exhaust gas treatment device (3), the system is characterized in that the inner space of the sand box (1) is divided into an upper water area (11), a soil area (12) and a lower water area (13), the upper water area (11) and the lower water area (13) are respectively positioned on two sides of the soil area (12), the areas are separated by a partition plate (5) with a filter hole, a steam injection pipe (7) connected with a steam generator (6) is arranged in the soil area (12), a steam meter (8) is arranged at the inlet of the steam injection pipe (7), the steam generator (6) and the tail gas treatment device (3) are respectively electrically connected with the control device (4).
2. An in situ steam injection based soil and groundwater remediation simulation system according to claim 1, wherein the soil zone (12) is filled with sandy soil or fine sand for forming a saturated zone environment (a); soil media such as plain filling soil, silt or clay are filled above the sandy soil or the fine sand to form an aeration zone environment (b), and the steam injection pipe (7) is inserted into the saturated zone environment (a) or the aeration zone environment (b) in the soil area (12).
3. The in-situ steam injection-based soil and groundwater remediation simulation system of claim 2, wherein the ratio of the soil height of the saturated zone environment (a) to the soil height of the aeration zone environment (b) is 10:1 to 1: 1.
4. An in-situ steam injection based soil and groundwater remediation simulation system according to claim 1, wherein the extraction pipe (2) is an open hole pipe, a metal screen (9) is wound outside the extraction pipe (2), and the mesh of the metal screen (9) is smaller than the holes on the extraction pipe (2).
5. An in situ steam injection based soil and groundwater remediation simulation system as claimed in claim 4, wherein the metal mesh (9) has a pore size of less than 1 mm.
6. The simulation system for soil and groundwater remediation based on in situ steam injection as claimed in any of claims 1 to 5, wherein the outside of the sand box (1) is coated with an insulation board (10) and the soil area (11) is covered with a barrier layer (20).
7. The in-situ steam injection-based soil and groundwater remediation simulation system according to claim 6, wherein a thermocouple (30) for observing a soil temperature rise condition is further inserted into the soil in the soil area (11), and the control device (4) is electrically connected with the thermocouple (30).
8. The in-situ steam injection-based soil and groundwater remediation simulation system according to claim 1, wherein the tail gas treatment device (3) comprises a gas-liquid separator (31), a condenser (32), a refrigerator (33), a fan (34) and an activated carbon tank (35), the extraction pipe (2) is sequentially connected with the gas-liquid separator (31), the condenser (32), the fan (34) and the activated carbon tank (35), and the refrigerator (33) is connected with the condenser (32).
9. The in-situ steam injection-based soil and groundwater remediation simulation system according to claim 1, wherein the water feeding area (11) is connected with a water tank (40) through a water inlet pipe, a water outlet pipe (50) communicated with the water discharging area (13) is further arranged at the bottom of the sand box (1), and a regulating valve (60) is arranged on the water outlet pipe (50).
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