CN216064830U

CN216064830U - Shallow water layer and large burial depth multiphase extraction system

Info

Publication number: CN216064830U
Application number: CN202122478866.1U
Authority: CN
Inventors: 朱焰; 董海生; 刘兴富; 王超文; 朱齐民; 徐国卫
Original assignee: Center International Group Co Ltd
Current assignee: Center International Group Co Ltd
Priority date: 2021-10-15
Filing date: 2021-10-15
Publication date: 2022-03-18
Anticipated expiration: 2031-10-15

Abstract

The utility model discloses a shallow water layer and large burial depth multiphase extraction system, which comprises an oil-water two-phase extraction subsystem and a gas phase extraction subsystem, wherein the oil-water two-phase extraction subsystem and the gas phase extraction subsystem are respectively connected with each extraction well; the oil-water two-phase extraction subsystem comprises an aboveground flexible shaft pump with variable frequency and speed regulation and an extraction pipe, the extraction pipe hermetically penetrates through the wellhead of each extraction well, the inlet of the flexible shaft pump is connected with the outlet of the extraction pipe, and the outlet of the flexible shaft pump is output through a liquid discharge pipe; the vapor extraction subsystem comprises a vapor extraction pipe and a vacuum pump, the vapor extraction pipe penetrates through the well heads of the extraction wells in a sealing mode, the outlet of the vapor extraction pipe is connected with the inlet of the vacuum pump, and the extraction wells are vacuumized through the vacuum pump. The utility model adopts the overground flexible shaft pump with a variable-frequency speed regulator and the overground vapor extraction equipment, and can be suitable for repairing polluted sites with different depths, and the vacuum pump enables negative pressure to be formed in the well, thereby accelerating the flowing and removing speed of pollutants and accelerating the repairing and treating period.

Description

Shallow water layer and large burial depth multiphase extraction system

Technical Field

The utility model belongs to the technical field of soil and underground water purification, and particularly relates to a shallow water layer and large burial depth multiphase extraction system.

Background

Soil is a basic resource on which human beings rely for survival, but due to industrial development and other artificial pollution, the soil environment is increasingly worsened, the most serious pollution in soil is petroleum pollution, along with the promulgation and implementation of the soil pollution prevention and control law, the soil pollution prevention and control work is paid unprecedented attention, and meanwhile, the soil pollution prevention and control work is urgent.

At present, the petroleum polluted site restoration technology mainly comprises a multiphase extraction technology, a biological ventilation technology, an underground water aeration restoration technology (AS) and the like, wherein only the multiphase extraction technology capable of realizing the co-extraction of gas phase, water phase and LNAPL phase is adopted, the multiphase extraction technology commonly used in China at present comprises a single pump system and a double pump system, the working principle of the single pump system is that a vacuum pump in equipment generates large negative pressure to extract the gas phase, the water phase and the LNAPL phase from the underground to the surface for treatment, the gas phase is discharged to the atmosphere after qualified treatment, the water phase is discharged to a municipal pipe network or is recharged after qualified treatment, and the LNAPL (light non-water phase pollutant) phase is generally treated AS hazardous waste. But its depth of repair is limited because its working principle is a vacuum principle. At present, the maximum repair depth in the existing domestic repair case is 9m, a double-pump system is realized by matching a vacuum pump with an underground submersible pump, and the repair of the pollution depth with more than 9m can be realized.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art and solving the problem of pollution remediation plots with different pollution depths in China, the utility model provides a multiphase extraction system with a shallow water layer and a large buried depth, which can adjust the rotating speed of a motor according to LNAPL (low noise level indicator) and underground water in a well, so that the rotating speed is consistent with the penetration rate, and the failure rate is reduced.

The utility model adopts the following technical scheme:

a shallow water layer and large burial depth multiphase extraction system is connected with an extraction well group arranged in a polluted site, and comprises an oil-water two-phase extraction subsystem and a gas phase extraction subsystem, wherein the oil-water two-phase extraction subsystem and the gas phase extraction subsystem are respectively connected with each extraction well; the oil-water two-phase extraction subsystem comprises an aboveground flexible shaft pump with variable frequency and speed regulation and extraction pipes, wherein the extraction pipes hermetically penetrate through the well heads of the extraction wells, the inlet of the flexible shaft pump is connected with the outlet of the extraction pipes, and the outlet of the flexible shaft pump is output through a liquid discharge pipe; the vapor extraction subsystem comprises a vapor extraction pipe and a vacuum pump, the vapor extraction pipe hermetically penetrates through the well heads of the extraction wells, the outlet of the vapor extraction pipe is connected with the inlet of the vacuum pump, and the extraction wells are vacuumized by the vacuum pump.

Furthermore, the system also comprises an oil-water two-phase processing subsystem, a tail gas processing subsystem and a control device, wherein the liquid discharge pipe is connected with the oil-water two-phase processing subsystem; the vacuum pump outlet is connected with the tail gas treatment subsystem, and the control device forms interlocking control with the oil-water two-phase extraction subsystem, the gas-phase extraction subsystem, the oil-water two-phase treatment subsystem and the tail gas treatment subsystem respectively.

Preferably, profit diphase processing subsystem includes temporary storage device, diesel pump, self priming pump and oil interceptor, the export of fluid-discharge tube with temporary storage device connects, the diesel pump be used for with LNAPL among the temporary storage device is taken out to the useless container of danger mutually, the self priming pump be used for with aqueous phase among the temporary storage device is taken out extremely the oil interceptor, LNAPL in the oil interceptor is automatic arrange to the useless container of danger mutually.

The top of the oil separation tank is provided with an oil-water interface instrument, the side of the oil separation tank is provided with an electromagnetic valve, and when the LNAPL phase thickness in the oil separation tank reaches a set thickness, the electromagnetic valve is automatically controlled to be opened and automatically discharged to the dangerous waste container.

The oil separation tank is a three-level oil separation tank, the oil-water interface instrument and the electromagnetic valve are respectively arranged in each level of oil separation tank, when the LNAPL phase thickness in each level of oil separation tank reaches a set thickness, the corresponding electromagnetic valve is automatically controlled to be opened, and the LNAPL phase is discharged into the hazardous waste container.

An oil-water interface instrument and a fork level meter are arranged in the temporary storage device and used for detecting the liquid levels of an LNAPL phase and a water phase in the temporary storage device, and the liquid levels respectively form interlocking control with the diesel pump and the self-priming pump.

And the outlet of the gas-phase extraction pipe is connected with a gas-liquid separator, and the gas-phase outlet of the gas-liquid separator is connected with the inlet of the vacuum pump.

The technical scheme of the utility model has the following advantages:

A. the shallow water layer and large burial depth multiphase extraction system provided by the utility model is a double-pump system, an overground flexible shaft pump with a variable frequency speed regulator and an overground gas phase extraction device are adopted, an underground LNAPL phase and a polluted water phase are extracted by the flexible shaft pump (AC24V), a vacuum pump of a gas phase extraction subsystem is connected to an on-site multiphase extraction well group, negative pressure is formed in a well, the LNAPL phase is promoted to permeate and flow into the well from a soil gap, so that the removal rate of an LANPL phase pollutant is accelerated, and the repair and treatment period is shortened; the adopted flexible shaft pump with the frequency conversion and speed regulation functions can be suitable for pollution remediation plots with different pollution depths.

B. The system has good effect on treating and repairing the pollution of large underground water burial depth and shallow water layer, the used flexible shaft pump lifting pipe can be customized according to the repairing depth, the adopted flexible shaft pump is an above-ground pump, the electric elements are all on the ground and cannot be corroded by underground water, and the like, the rotating speed of the motor can be adjusted according to the quantity of the LNAPL phase and the underground water in the well, so that the pumping flow of the flexible shaft pump is adjusted, and the problem that the pumping speed of the existing submersible pump is far higher than the permeation rate of the underground LNAPL phase and the water phase, the phenomenon that the submersible pump runs idle and burns the pump, and the like is solved.

C. According to the utility model, the oil-water two-phase treatment subsystem and the tail gas treatment subsystem are arranged in the system, oil-water-gas three phases extracted from the extraction well group are respectively treated, the extracted oil and water are centrally temporarily stored, and then oil-water separation is carried out through the oil separation tank, so that the purposes of purification and reutilization are achieved, the treatment process is simple, and the repair efficiency is high.

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 multiphase extraction system provided by the present invention.

The labels in the figure are as follows:

1-extraction well group

11-extraction well

2-oil-water two-phase extraction subsystem

21-flexible shaft pump, 22-extraction pipe, 23-liquid discharge pipe

3-vapor phase extraction subsystem

31-gas phase extraction tube, 32-vacuum pump, 33-gas-liquid separator

4-oil-water two-phase processing subsystem

41-temporary storage device, 42-diesel pump, 43-self-priming pump and 44-oil separation tank

5-exhaust gas treatment subsystem

6-dangerous waste container

7-flow meter

a-oil-water interface instrument, b-tuning fork level meter, c-electromagnetic valve

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 of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular 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; the connection can be mechanical connection or electrical connection; 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 fig. 1, the utility model provides a multiphase extraction system with a shallow water layer and a large burial depth, which is connected with a plurality of extraction well groups 1 arranged in a polluted site, the system comprises an oil-water two-phase extraction subsystem 2 and a gas-phase extraction subsystem 3, and the oil-water two-phase extraction subsystem 2 and the gas-phase extraction subsystem 3 are respectively connected with each extraction well 11; the oil-water two-phase extraction subsystem 2 adopted in the system comprises an aboveground flexible shaft pump 21 and an extraction pipe 22 with variable frequency and speed regulation, the rotating speed of the flexible shaft pump 21 is controlled by a frequency converter, a sealed wellhead (not shown in the figure) is respectively arranged at the outlet end of each extraction well 11 and is equivalent to a well plug seal, two openings are arranged on the wellhead, the extraction pipe 22 is in a sealed manner and penetrates through the wellhead opening of each extraction well 11, the extraction pipe 22 is in sealed connection with the opening, the inlet of the flexible shaft pump 21 is connected with the outlet of the extraction pipe 22 on the aboveground, the outlet of the flexible shaft pump 21 is output through a liquid discharge pipe 23, namely, the oil-water two-phase liquid extracted by the flexible shaft pump 21 of each extraction well 11 is collected into the liquid discharge pipe 23; the vapor extraction subsystem 3 comprises a vapor extraction pipe 31 and a vacuum pump 32, the vapor extraction pipe 31 penetrates through the other opening of the wellhead of each extraction well 11 in a sealing manner and is connected with the opening of the wellhead in a sealing manner, the outlet of the vapor extraction pipe 31 is connected with the inlet of the vacuum pump 32, the extraction wells 11 are vacuumized by the vacuum pump 32, and the vapor in the soil is pumped into the wells from gaps and is subjected to subsequent treatment after being vacuumized by the vacuum pump 32.

The flexible shaft pump 21 provides power for the extraction system after being powered on, the material of the extraction pipe 22 is preferably U-PVC, the corrosion resistance is strong, the flow resistance is small, and meanwhile, marks are made on the outer pipe wall of the extraction pipe 22 at intervals of 1m and are used for roughly estimating the descending depth of the flexible shaft pump 21, and fine measurement needs to be carried out by additionally matching a mechanical hand-operated oil-water interface meter (not shown in the figure) graduated scale; the material of the drain pipe 23 is preferably U-PVC, and the LNAPL phase and the water phase pumped out by the flexible shaft pump 21 enter the subsequent process treatment link.

The system is also provided with an oil-water two-phase processing subsystem 4 for processing the extracted oil, gas and water three phases, a tail gas processing subsystem 5 and a control device (not shown in the figure), and a liquid discharge pipe 23 is connected with the oil-water two-phase processing subsystem 4; the outlet of the vacuum pump 32 is connected with the tail gas treatment subsystem 5, and the control device forms interlocking control with the oil-water two-phase extraction subsystem 2, the gas-phase extraction subsystem 3, the oil-water two-phase treatment subsystem 4 and the tail gas treatment subsystem 5 respectively.

Specifically, the oil-water two-phase processing subsystem 4 includes four parts, which are a temporary storage device 41, a diesel pump 42, a self-priming pump 43 and an oil separation tank 44.

The temporary storage device 41 for the LNAPL phase and the water phase needs to be arranged in a land parcel for repairing a polluted land parcel with a large area, two-phase liquid extracted by the flexible shaft pump 21 in the extraction well group 1 is discharged into the temporary storage device 41, the liquid extracted by the flexible shaft pump 21 from the extraction well group 1 on site is temporarily stored in the temporary storage device 41, and the temporary storage device 41 can be provided with an oil-water interface instrument a and a sound fork level meter b for detecting the liquid levels of the LNAPL phase and the water phase in the temporary storage device 41.

When the liquid level of the LNAPL phase in the temporary storage device 41 reaches the set thickness, the diesel pump 42 directly pumps the LNAPL phase in the temporary storage device 41 to the hazardous waste container 6; when the water phase in the temporary storage device 41 reaches the set liquid level, the self-priming pump 43 pumps the water phase in the temporary storage device 41 out to the oil separation tank 44 for secondary oil separation treatment, and the flow meter 7 is installed on the pipeline for counting the treated water quantity.

The oil separation tank 44 of the utility model mainly carries out secondary treatment on liquid from a self-priming pump 43, the oil separation tank 44 is specially designed, the top of the oil separation tank 44 is provided with an oil-water interface instrument a, the side surface is provided with an electromagnetic valve c automatic monitoring instrument, when the LNAPL phase thickness in the oil separation tank 44 reaches a set thickness, the LNAPL phase thickness is automatically discharged to a hazardous waste container 6, and the water phase enters a subsequent water treatment device for further treatment. The oil separation tank 44 is preferably a three-stage oil separation tank, an oil-water interface instrument a and an electromagnetic valve c are respectively arranged in each stage of oil separation tank 44, each stage of oil separation tank 44 is directly connected to the hazardous waste container 6 through an oil path, and the discharge of the hazardous waste container is controlled through the electromagnetic valve c.

In order to further carry out gas-liquid two-phase separation treatment on the extracted waste gas, a gas-liquid separator 33 is arranged in front of the vacuum pump 32, VOCs gas in the extraction wells 11 is extracted into the gas-liquid separator 33 for gas-liquid separation by means of negative pressure formed in each extraction well 11 by the vacuum pump 32, LNAPL phase in soil gaps flows into the wells under the driving of the negative pressure, the separated waste gas is discharged to the tail gas treatment subsystem 5 through the vacuum pump 32, and the condensed waste water is conveyed to waste water treatment equipment.

The tail gas treatment subsystem 5 adopted by the utility model can select proper tail gas treatment equipment according to the concentration of VOCs gas, such as: activated carbon adsorption, TO, RTO, CO, RCO, and the like.

The control device provides power supply and interlocking control for power equipment such as the soft shaft pump, the diesel pump, the self-priming pump and the vacuum pump, and monitoring instruments such as an oil-water interface instrument and a tuning fork level meter, and is the core for realizing automatic control of the whole system.

The multiphase extraction system for shallow water layers and large burial depth provided by the utility model adopts an overground flexible shaft pump and a gas phase extraction subsystem to form a multiphase repair system capable of realizing shallow water layers and large burial depth. The aboveground flexible shaft pump avoids a series of defects of a submersible pump in a traditional multiphase extraction double-pump system, such as: the submersible pump is placed in liquid in the well for a long time, so that a pump body, parts and a power line of a motor are corroded and damaged, the pump body cannot be extracted, the pumping rate of the submersible pump is far higher than the permeation rate of an underground LNAPL phase and a water phase, and the phenomenon of idle pump burning of the pump occurs. The depth of the flexible shaft pump inserted into the extraction well can be customized according to the depth of the field extraction well, the defect that a multiphase extraction single pump system can only repair 9m buried depth is solved, the flexible shaft pump is designed and matched with a variable frequency speed regulator, the flexible shaft pump can be input into a power supply to be regulated below AC6V through the variable frequency speed regulator, the flow of LNAPL and a water phase pumped by the flexible shaft pump can be regulated to about 0.5L/min, and the pump burning phenomenon caused by slow infiltration of the LNAPL phase and the water phase in a soil gap and higher extraction rate of a submersible pump than the infiltration rate of the LNAPL phase and the water phase is solved.

The utility model is applicable to the prior art.

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 utility model.

Claims

1. A shallow water layer and large burial depth multi-phase extraction system is connected with an extraction well group (1) arranged in a polluted site and is characterized by comprising an oil-water two-phase extraction subsystem (2) and a gas-phase extraction subsystem (3), wherein the oil-water two-phase extraction subsystem (2) and the gas-phase extraction subsystem (3) are respectively connected with each extraction well (11); the oil-water two-phase extraction subsystem (2) comprises an aboveground flexible shaft pump (21) with variable frequency and variable speed and extraction pipes (22), the extraction pipes (22) hermetically penetrate through the well heads of the extraction wells (11), the inlet of the flexible shaft pump (21) is connected with the outlet of the extraction pipes (22), and the outlet of the flexible shaft pump (21) is output through a liquid discharge pipe (23); the vapor extraction subsystem (3) comprises vapor extraction pipes (31) and vacuum pumps (32), the vapor extraction pipes (31) hermetically penetrate through the wellhead of each extraction well (11), the outlets of the vapor extraction pipes (31) are connected with the inlets of the vacuum pumps (32), and the extraction wells (11) are vacuumized through the vacuum pumps (32).

2. The shallow water layer and large burial depth multiphase extraction system of claim 1, further comprising an oil-water two-phase treatment subsystem (4), a tail gas treatment subsystem (5) and a control device, wherein the liquid discharge pipe (23) is connected with the oil-water two-phase treatment subsystem (4); the outlet of the vacuum pump (32) is connected with the tail gas treatment subsystem (5), and the control device forms interlocking control with the oil-water two-phase extraction subsystem (2), the gas-phase extraction subsystem (3), the oil-water two-phase treatment subsystem (4) and the tail gas treatment subsystem (5) respectively.

3. The shallow water layer and large burial depth multiphase extraction system of claim 2, wherein the oil-water two-phase treatment subsystem (4) comprises a temporary storage device (41), a diesel pump (42), a self-priming pump (43) and an oil separation tank (44), wherein an outlet of the drain pipe (23) is connected with the temporary storage device (41), the diesel pump (42) is used for pumping the LNAPL phase in the temporary storage device (41) to the hazardous waste container (6), the self-priming pump (43) is used for pumping the water phase in the temporary storage device (41) to the oil separation tank (44), and the LNAPL phase in the oil separation tank (44) is automatically discharged to the hazardous waste container (6).

4. The shallow water layer and large burial depth multiphase extraction system of claim 3, wherein an oil-water interface meter (a) is arranged at the top of the oil separation tank (44), an electromagnetic valve (c) is arranged on the side surface of the oil separation tank, and when the thickness of the LNAPL phase in the oil separation tank (44) reaches a set thickness, the electromagnetic valve (c) is automatically controlled to be opened and automatically discharged to the hazardous waste container (6).

5. The shallow water layer and large burial depth multiphase extraction system of claim 4, wherein the oil separation tank (44) is a three-stage oil separation tank, the oil-water interface instrument (a) and the electromagnetic valve (c) are respectively arranged in each stage of oil separation tank (44), and when the LNAPL phase thickness in each stage of oil separation tank (44) reaches a set thickness, the corresponding electromagnetic valve is automatically controlled to be opened, so that the LNAPL phase is discharged into the hazardous waste container (6).

6. The shallow water layer, large burial depth multiphase extraction system of claim 3, wherein the temporary storage device (41) is provided with an oil-water level meter (a) and a tone fork level meter (b) for detecting the liquid levels of the LNAPL phase and the water phase in the temporary storage device (41), which are interlocked with the diesel pump (42) and the self-priming pump (43), respectively.

7. The shallow water layer, large burial depth multiphase extraction system of any one of claims 1-6, wherein an outlet of the gas phase extraction pipe (31) is connected with a gas-liquid separator (33), and a gas phase outlet of the gas-liquid separator (33) is connected with an inlet of the vacuum pump (32).