CN216950339U - Automatic continuous desanding system - Google Patents
Automatic continuous desanding system Download PDFInfo
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- CN216950339U CN216950339U CN202123067303.XU CN202123067303U CN216950339U CN 216950339 U CN216950339 U CN 216950339U CN 202123067303 U CN202123067303 U CN 202123067303U CN 216950339 U CN216950339 U CN 216950339U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The utility model discloses an automatic continuous desanding system which comprises a cyclone separator, a gravity separator, a water tank, a magnetic turning plate liquid level meter, a liquid level alarm controller, a first electric pump and a PLC (programmable logic controller); the top and the bottom of the cyclone separator are respectively connected with the first gas outlet pipeline and the top of the gravity separator; the gravity separator is connected with the second gas outlet pipeline; the bottom of the gravity separator is connected with a sewage discharge pipeline, and an adjusting valve is arranged on the sewage discharge pipeline; the magnetic turning plate liquid level meter is arranged on the gravity separator, and a liquid level alarm controller is connected between an upper end liquid level port and a lower end liquid level port of the magnetic turning plate liquid level meter; a first electric pump pumps water from the water tank to the gravity separator; the PLC controller is respectively electrically connected with the liquid level alarm controller, the first electric pump and the regulating valve. The utility model can solve the problems that the back-end equipment is easy to block and erode and cannot realize automatic sand discharge caused by sand production in the fracturing process of domestic natural gas at present.
Description
Technical Field
The utility model relates to the technical field of natural gas exploitation, in particular to an automatic continuous desanding system.
Background
A large amount of water, sand, impurities and the like can be generated in the natural gas fracturing process, sand is produced in the natural gas fracturing process at present, rear-end equipment is easily blocked and eroded, the production efficiency is seriously affected, automatic sand discharging cannot be realized, and therefore an automatic continuous sand removing system needs to be designed.
SUMMERY OF THE UTILITY MODEL
The utility model provides an automatic continuous sand removing system, which aims to solve the problems that in the prior art, sand production in the natural gas fracturing process easily causes the blockage and erosion of rear-end equipment, and automatic sand discharge cannot be realized.
The technical scheme adopted by the utility model is as follows: the automatic continuous desanding system comprises a cyclone separator, a gravity separator, a water tank, a magnetic turning plate liquid level meter, a liquid level alarm controller, a first electric pump and a PLC (programmable logic controller);
the inlet of the cyclone separator is connected with an air inlet pipeline, and an air outlet at the top and an air outlet at the bottom of the cyclone separator are respectively connected with a first air outlet pipeline and an air inlet at the top of the gravity separator;
the gas outlet of the gravity separator is connected with the second gas outlet pipeline and is converged with the first gas outlet pipeline;
a liquid outlet at the bottom of the gravity separator is connected with a sewage discharge pipeline, and an adjusting valve is arranged on the sewage discharge pipeline;
the magnetic turning plate liquid level meter is arranged on the gravity separator, and the liquid level alarm controller is connected between the upper end liquid level port and the lower end liquid level port of the magnetic turning plate liquid level meter;
the first electric pump pumps water from the water tank and conveys the water to the gravity separator through a first water pumping pipeline;
the PLC controller is respectively electrically connected with the liquid level alarm controller, the first electric pump and the regulating valve.
As a preferable mode of the automatic continuous desanding system, an overflow valve is further arranged on the first water pumping pipeline.
As a preferable mode of the automatic continuous desanding system, an electromagnetic valve is further arranged on the first water pumping pipeline and is electrically connected with the PLC; and a check valve is also arranged on the first water pumping pipeline.
As a preferable mode of the automatic continuous sand removing system, the system further comprises a second electric pump and a second water pumping pipeline, wherein the second electric pump pumps water from the sewage tank and conveys the water to the water tank through the second water pumping pipeline.
As a preferable mode of the automatic continuous sand removing system, the first electric pump and the second electric pump are both gear pumps.
As an optimal mode of the automatic continuous desanding system, the first water pumping pipeline is further provided with two branches which are respectively connected with the upper end liquid level port and the lower end liquid level port of the magnetic turning plate liquid level meter, and the two branches are provided with ball valves.
As a preferable mode of the automatic continuous desanding system, an automatic emptying pipeline and a first manual emptying pipeline are further arranged on the gravity separator, and a spring full-open type safety valve is arranged on the automatic emptying pipeline.
As a preferred mode of the automatic continuous desanding system, a second manual emptying pipeline is connected to the sewage discharge pipeline in parallel.
As a preferred mode of the automatic continuous sand removing system, the gravity separator is a horizontal separator.
The utility model also provides an automatic continuous sand discharge process based on the automatic continuous sand removing system, which comprises the following steps:
main flow: the sand-containing natural gas enters from the gas inlet of the cyclone separator, and after flowing through the cyclone separator, particles such as sand, water, impurities and the like are separated out under the action of cyclone flow; the separated natural gas flows to the gas outlet in two paths, and one path of gas flow upwards reaches the gas outlet from the gas outlet at the top of the cyclone separator; one path of air flow is downward and flows to the air outlet after passing through the gravity separator tank body;
liquid level control process: the PLC controls the regulating valve and the first electric pump to be opened and closed through signals of the liquid level alarm controller, so that the liquid level in the gravity separator is always positioned within the upper limit and the lower limit of the magnetic turning plate liquid level meter; when the liquid level in the gravity separator is higher than the upper limit of the liquid level alarm controller, the PLC controller controls the opening of the regulating valve to be opened according to the set opening and the pressure is controlled step by step until the liquid level is positioned in the upper limit and the lower limit of the liquid level; when the liquid level in the gravity separator is lower than the lower limit of the liquid level alarm controller, the PLC controller controls the first electric pump to be started until the liquid level is positioned within the upper limit and the lower limit of the liquid level;
a sand discharge flow: controlling the liquid level in the gravity separator to ensure that water and sand are always in a mixed state, and discharging a sand-water mixture from the gravity separator;
a water injection flow: when the water level in the water tank is lower than a set value, a second electric pump is started to pump water into the water tank; the first electric pump is linked with the liquid level signal, the PLC controller controls the start and stop of the first electric pump, and water in the water tank is filled into the gravity separator to enable the water level to reach a certain liquid level height;
a cleaning process: the injected water respectively enters from three points, and different parts are cleaned by operating different valves;
a. the sand enters from a slag discharge port of the gravity separator and blows away the sand deposited at the bottom;
b. the liquid enters from a liquid level port at the lower end of the magnetic turning plate liquid level meter, clogging of the liquid level port at the lower end of the liquid level meter is cleaned, and the magnetic turning plate liquid level meter is prevented from being polluted;
c. the liquid enters from a liquid level port at the upper end of the magnetic turning plate liquid level meter, clogging of the liquid level port at the upper end of the liquid level meter is cleaned, and the magnetic turning plate liquid level meter is prevented from being polluted.
The utility model has the beneficial effects that: the system combines a cyclone separator and a gravity separator, sand erosion heavy objects are circularly brought into a sewage disposal pool through the cyclone separator and the gravity separator, and automatic water injection and sand flushing and continuous flow control sand discharge are realized by controlling water injection through a magnetic turning plate liquid level meter and controlling water discharge through an electromagnetic valve. When the liquid level is set at a high pressure, the system opens the transfer electromagnetic valve to discharge liquid according to the set step length and the adjustment time, and simultaneously starts the water injection system to wash sand to ensure that sand in the gravity separator circulates. When the discharged liquid amount is larger than the water yield of the shaft, the system starts to close the electromagnetic valve according to the set step length and the adjustment time, the liquid level in the gravity separator is kept to be more than 400-580mm, and meanwhile, the water injection system can automatically supplement the liquid level to ensure that sufficient water is in the equipment.
Drawings
FIG. 1 is a flow chart of an automatic continuous grit removal system as disclosed in the present invention.
Reference numerals: 1. a cyclone separator; 2. a gravity separator; 3. a sewage tank; 4. a water tank; 5. a magnetic flap level gauge; 6. a liquid level alarm controller; 7. a first electric pump; 8. a second electric pump; 9. an overflow valve; 10. an electromagnetic valve; 11. adjusting a valve; 12. a spring full-open type safety valve; 13. a check valve; 14. an air intake line; 15. a first gas outlet pipeline; 16. a second outlet pipeline; 17. automatically emptying the pipeline; 18. a first manual blowdown line; 19. a sewage draining pipeline; 20. a second manual emptying pipeline; 21. a first water pumping pipeline; 22. And a second water pumping pipeline.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail below with reference to the accompanying drawings, but embodiments of the present invention are not limited thereto.
Example 1:
referring to fig. 1, the embodiment discloses an automatic continuous desanding system, which comprises a cyclone separator 1, a gravity separator 2, a water tank 4, a magnetic turning plate liquid level meter 5, a liquid level alarm controller 6, a first electric pump 7 and a PLC controller.
An inlet a of the cyclone separator 1 is connected with an air inlet pipeline 14, and an air outlet b at the top and an air outlet h at the bottom of the cyclone separator 1 are respectively connected with a first air outlet pipeline 15 and an air inlet c at the top of the gravity separator 2.
The gas outlet d of the gravity separator 2 is connected with the second gas outlet pipeline 16 and is converged with the first gas outlet pipeline 15; and the first outlet pipeline 15 and/or the second outlet pipeline 16 are/is provided with one-way valves. Preferably, the gravity separator 2 is a horizontal separator.
A liquid outlet e at the bottom of the gravity separator 2 is connected with a sewage discharge pipeline 19, and the sewage discharge pipeline 19 is provided with an adjusting valve 11. Preferably, a second manual emptying line 20 is also arranged in parallel on the blowdown line 19, and the liquid in the gravity separator 2 can be manually emptied, and the second manual emptying line 20 can be used for releasing when the gravity separator 2 needs to be emptied.
The magnetic flap liquid level meter 5 is arranged on the gravity separator 2, and a liquid level alarm controller 6 is connected between an upper end liquid level port g1 and a lower end liquid level port g2 of the magnetic flap liquid level meter 5.
The first electric pump 7 draws water from the water tank 4 and delivers it to the gravity separator 2 through a first water drawing line 21.
The PLC controller is respectively and electrically connected with the liquid level alarm controller 6, the first electric pump 7 and the regulating valve 11.
Further, the first water pumping pipeline 21 is further provided with an overflow valve 9, so that the first electric pump 7 is protected from being over-pressurized. Still be provided with solenoid valve 13 on the first pipeline 21 of intaking, and solenoid valve 13 is connected with the PLC controller electricity, avoids the electric pump to take the pressure to start. The first water pumping line 21 is also provided with a check valve 13 to prevent the first electric pump 7 from being unsafe in pressure reversal.
Because the air field water resource is scarce, just can utilize the water that the blowdown pipeline was arranged to the effluent water sump 3 as the water source, still need to design second electric pump 8 and second water pumping pipeline 22 this moment, and second electric pump 8 draws water from effluent water sump 3 and carries to water tank 4 through second water pumping pipeline 22, and is pumped to gravity separator 2 by first electric pump 7 after deposiing in water tank 4. Preferably, the first electric pump 7 and the second electric pump 8 are gear pumps, which are powerful and less sensitive to liquid contamination than other types of pumps.
Furthermore, the first water pumping pipeline 21 is further provided with two branches which are respectively connected with the upper end liquid level port g1 and the lower end liquid level port g2 of the magnetic turning plate liquid level meter 5, and the two branches are provided with ball valves for cleaning clogging of the upper port and the lower port of the magnetic turning plate liquid level meter 5, so that the magnetic turning plate liquid level meter 5 is prevented from being polluted, and the whole control system is disabled due to sensing failure of the liquid level.
An automatic emptying pipeline 17 and a first manual emptying pipeline 18 are further arranged on the gravity separator 2, and a spring full-open type safety valve is arranged on the automatic emptying pipeline 17.
The system combines a cyclone separator 1 and a gravity separator 2, sand erosion heavy objects are circularly brought into a sewage disposal pool 3 through the cyclone separator 1 and the gravity separator 2, water injection is controlled through a magnetic turning plate liquid level meter 5, and water drainage is controlled through an electromagnetic valve 10 to realize automatic water injection sand washing and continuous flow control sand drainage. When the liquid level is set at a high pressure, the system opens the transfer electromagnetic valve 10 to discharge liquid according to the set step length and the adjustment time, and simultaneously starts the water injection system to wash sand to ensure that sand in the gravity separator 2 circulates. When the discharged liquid amount is larger than the water yield of the shaft, the system starts to close the electromagnetic valve 10 according to the set step length and the adjustment time, the liquid level in the gravity separator 2 is kept to be more than 400-580mm, and meanwhile, the water injection system can automatically supplement the liquid level to ensure that sufficient water exists in the equipment.
Illustratively, the process of the present invention is as follows:
after sand removal by the cyclone separator 1, the natural gas is separated in a gravity separator 2.
Continuous desanding is realized by logically controlling the water injection system and the electromagnetic valve 10, and the control mode is as follows:
in the first case:
the liquid level is 300
The liquid level is 400
The liquid level is 500, and the period is adjusted until the maximum opening degree is reached.
In the second case:
liquid level lower limit 300
The liquid level is 400
The liquid level is 200, and the opening degree is reduced by 2 every 20s until the liquid level is 0.
In a third case:
liquid level lower limit 300
The liquid level is 400
The liquid level is 350, and the opening degree is not changed.
In a fourth case:
the liquid level is 300
The liquid level is 400
Safety liquid level of 200
The liquid level is 100, the opening degree is immediately 0, and the adjusting time is closed to 0.
The industrial personal computer sends a data instruction to the PLC control system according to the magnetic turning plate liquid level meter 5, and the PLC logic control system switches the opening degree of the electromagnetic valve 10 and the water injection system until the liquid level is within a set liquid level range.
The working principle is as follows:
1. main flow: the sand-containing natural gas enters from an air inlet a of the cyclone separator 1, and after flowing through the cyclone separator 1, particles such as sand, water, impurities and the like are separated out under the action of cyclone flow; the separated natural gas flows to the gas outlet in two paths. One path of air flow upwards reaches an air outlet from an air outlet b at the top of the cyclone separator 1; one path of air flow is downward, passes through the tank body of the horizontal gravity separator 2, reaches the air outlet end d, and is converged with the air flow from the upper part at the air outlet.
In the first stage, solid and liquid impurities separated by the cyclone separator 1 enter the tank body from an air inlet of the gravity separator 2 under the action of gravity and downward airflow; in the second stage, impurities are settled in the tank body of the gravity separator 2, so that solid particles such as water, sand and the like are separated and gathered at the bottom of the separator, and secondary sand removal is completed.
2. A sand discharge flow: the purpose is to continuously discharge sand. The sand is in the water, and the sand is carried out of the tank through the opening e by the drainage through the mixture formed by the water and the sand by utilizing the pressure difference. The purpose of sand discharge is achieved. Through the regulating valve 11, the water level signal is interlocked and operated, the drainage flow is automatically regulated, and the purposes of stabilizing sand drainage and preventing air blowby are achieved.
3. Water injection flow and cleaning flow:
in order to increase the reliability of a desanding system and meet the requirement of smooth desanding under different working conditions, the process is specially designed, so that water is always kept at a certain liquid level height, the sand is prevented from being deposited and agglomerated easily, and the desanding is facilitated. A two-stage pump package is provided, the first stage from the sump 3 to the tank 4 and the second stage from the tank 4 to the gravity separator 2.
a water injection flow: first electric pump 7 links with the liquid level signal, and PLC controls opening of first electric pump stops, with the water filling of water tank 4 to gravity separator 2, makes the water level reach certain liquid level height.
Here, the design is made in detail,
1) an overflow valve of the pump station protects the electric pump from over-high pressure; when the pressure in the pipeline is overlarge, the overflow valve is automatically opened to drain water and release pressure in the pipeline;
2) the electromagnetic valve is arranged to prevent the electric pump from starting under pressure;
3) the check valve is arranged to prevent the unsafe situation of the pressure reverse thrust electric pump;
b, cleaning process:
the injected water enters from three points respectively, and different parts are cleaned by operating different valves.
a. Enters from the slag discharge port f and blows off the sand grains deposited at the bottom.
b. The liquid enters from a liquid level port g2 at the lower end of the liquid level meter, clogging of the liquid level port at the lower end of the liquid level meter is cleaned, the pollution of the liquid level meter is avoided, and the whole control system is disabled due to failure of liquid level sensing.
c. Enters from a liquid level port g1 at the upper end of the liquid level meter and has the same function as the liquid level meter.
4. The control flow comprises the following steps:
through the PLC, realized:
a. liquid level and regulating valve linkage
b. Liquid level and electric pump linkage
Example 2
The embodiment discloses an automatic continuous sand discharge process, which is based on the automatic continuous sand discharge system in the embodiment 1, and the process comprises the following steps:
main flow: the sand-containing natural gas enters from the gas inlet of the cyclone separator, and after flowing through the cyclone separator, particles such as sand, water, impurities and the like are separated out under the action of cyclone flow; the separated natural gas flows to the gas outlet in two paths, and one path of gas flow upwards reaches the gas outlet from the gas outlet at the top of the cyclone separator; one path of air flow is downward and flows to the air outlet after passing through the tank body of the horizontal gravity separator.
Liquid level control process: the PLC controls the regulating valve and the first electric pump to be opened and closed through signals of the liquid level alarm controller, so that the liquid level in the gravity separator is always positioned within the upper limit and the lower limit of the magnetic turning plate liquid level meter; when the liquid level in the gravity separator is higher than the upper limit of the liquid level alarm controller, the PLC controller controls the opening of the regulating valve to be opened according to the set opening and the pressure is controlled step by step until the liquid level is positioned in the upper limit and the lower limit of the liquid level; when the liquid level in the gravity separator is lower than the lower limit of the liquid level alarm controller, the PLC controller controls the first electric pump to be started until the liquid level is within the upper limit and the lower limit of the liquid level.
A sand discharge flow: the water and the sand are always in a mixed state by controlling the liquid level in the gravity separator, and the sand-water mixture is discharged from the gravity separator.
A water injection flow: when the water level in the water tank is lower than a set value, a second electric pump is started to pump water into the water tank; the first electric pump is linked with the liquid level signal, the PLC controller controls the start and stop of the first electric pump, and water in the water tank is filled into the gravity separator, so that the water level reaches a certain liquid level height.
A cleaning process: the injected water enters from three points respectively, and different parts are cleaned by operating different valves.
a. The sand enters from a slag discharge port of the gravity separator and blows away the sand deposited at the bottom;
b. the liquid enters from a liquid level port at the lower end of the magnetic turning plate liquid level meter, clogging of the liquid level port at the lower end of the liquid level meter is cleaned, and the magnetic turning plate liquid level meter is prevented from being polluted;
c. the liquid enters from a liquid level port at the upper end of the magnetic turning plate liquid level meter, clogging of the liquid level port at the upper end of the liquid level meter is cleaned, and the magnetic turning plate liquid level meter is prevented from being polluted.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. An automatic continuous desanding system is characterized by comprising a cyclone separator, a gravity separator, a water tank, a magnetic turning plate liquid level meter, a liquid level alarm controller, a first electric pump and a PLC (programmable logic controller);
the inlet of the cyclone separator is connected with an air inlet pipeline, and an air outlet at the top and an air outlet at the bottom of the cyclone separator are respectively connected with a first air outlet pipeline and an air inlet at the top of the gravity separator;
the gas outlet of the gravity separator is connected with the second gas outlet pipeline and is converged with the first gas outlet pipeline;
a liquid outlet at the bottom of the gravity separator is connected with a sewage discharge pipeline, and an adjusting valve is arranged on the sewage discharge pipeline;
the magnetic turning plate liquid level meter is arranged on the gravity separator, and the liquid level alarm controller is connected between the upper end liquid level port and the lower end liquid level port of the magnetic turning plate liquid level meter;
the first electric pump pumps water from the water tank and conveys the water to the gravity separator through a first water pumping pipeline;
the PLC controller is respectively electrically connected with the liquid level alarm controller, the first electric pump and the regulating valve.
2. The system according to claim 1, wherein an overflow valve is further disposed on the first pumping line.
3. The automatic continuous desanding system according to claim 1, wherein an electromagnetic valve is further arranged on the first water pumping pipeline and electrically connected with a PLC (programmable logic controller); and a check valve is also arranged on the first water pumping pipeline.
4. The system of claim 1, further comprising a second electric pump and a second pumping line, wherein the second electric pump pumps water from the wastewater tank and delivers the pumped water to the tank through the second pumping line.
5. The automatic continuous grit removal system of claim 4, wherein said first and second electric pumps are gear pumps.
6. The automatic continuous desanding system according to claim 1, wherein the first pumping pipeline is further provided with two branches which are respectively connected with the upper liquid level port and the lower liquid level port of the magnetic flap level gauge, and the two branches are provided with ball valves.
7. The automatic continuous desanding system according to claim 1, wherein an automatic emptying pipeline and a first manual emptying pipeline are further arranged on the gravity separator, and a spring full-open safety valve is arranged on the automatic emptying pipeline.
8. The automatic continuous desanding system of claim 1 wherein a second manual blowdown line is also connected in parallel to the blowdown line.
9. The system for automated continuous grit removal according to claim 1, wherein said gravity separator is a horizontal separator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123067303.XU CN216950339U (en) | 2021-12-08 | 2021-12-08 | Automatic continuous desanding system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123067303.XU CN216950339U (en) | 2021-12-08 | 2021-12-08 | Automatic continuous desanding system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216950339U true CN216950339U (en) | 2022-07-12 |
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ID=82306973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123067303.XU Active CN216950339U (en) | 2021-12-08 | 2021-12-08 | Automatic continuous desanding system |
Country Status (1)
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| CN (1) | CN216950339U (en) |
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2021
- 2021-12-08 CN CN202123067303.XU patent/CN216950339U/en active Active
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