Oil-gas separation apparatus capable of implementing complete degassing and methods

Abstract

The present application provides an oil-gas separation apparatus capable of implementing complete degassing and methods. The apparatus comprises: a piston cylinder and a degassing cylinder, a degassing solenoid valve being arranged between the degassing cylinder and the piston cylinder, one end of the degassing solenoid valve extending into the interior of the piston cylinder, and the other end thereof being in communication with the degassing cylinder; a variable speed diaphragm pump, an air intake end thereof being in communication with the atmosphere and an air discharge end thereof being in communication with the degassing cylinder for drawing ambient air, and used for cleaning a gas path of the oil-gas separation apparatus, and providing power for the degassing cylinder, thereby replacing a design involving a carrier gas cylinder or a gas generator; and a main control module. According to the present application, the piston cylinder, the degassing cylinder, the degassing solenoid valve, and the variable speed diaphragm pump are integrated and are uniformly controlled by the main control module, so that high-efficiency oil and gas separation is implemented. A unique degassing control method and a concentration calculation method are designed, so that fast and efficient degassing is implemented, nearly complete degassing is achieved without correcting a degassing rate, a mathematical model for inverse calculation of an oil sample concentration on the basis of a gas concentration is simplified, and concentration conversion is convenient.

Description

Oil-gas separation device and method capable of realizing complete degassing TECHNICAL FIELD

[0001] The present application relates to the technical field of oil-gas separation, in particular to an oil-gas separation device capable of realizing complete degassing, and a corresponding control method and oil sample concentration calculation method. BACKGROUND

[0002] An online monitoring device for dissolved gas in oil is a necessary monitoring device for large transformer operation and has been widely used. The online monitoring device for dissolved gas in oil mainly includes two parts: an oil-gas separation part and a gas analysis part. The oil-gas separation methods adopted mainly include membrane permeation, vacuum degassing and dynamic headspace degassing. Most of the oil-gas separation devices on the market are based on the dissolved equilibrium method. The key indicators of degassing equilibrium time and degassing rate show large differences, and it is difficult to realize complete degassing. In actual application, the degassing rate of the oil-gas separation device needs to be calibrated and corrected, which causes the complexity of the production process of the equipment, and poor degassing consistency is not conducive to batch production.

[0003] Therefore, the present application is proposed. SUMMARY

[0004] In view of the defects in the prior art, the present application aims to provide an oil-gas separation device capable of realizing complete degassing. A special degassing control method and a concentration calculation method are designed based on the device, realizing rapid and efficient degassing, close to complete degassing, without the need to correct the degassing rate, and convenient concentration conversion, thereby solving the above technical problems.

[0005] In one aspect of the present application, an oil-gas separation device capable of realizing complete degassing is provided, comprising:

[0006] A piston cylinder is provided with a piston cylinder top cover at one end and a motor at the other end.

[0007] A degassing cylinder is in communication with one end of the piston cylinder.

[0008] A degassing electromagnetic valve is arranged between the degassing cylinder and the piston cylinder, one end of the degassing electromagnetic valve extends into the interior of the piston cylinder, and the other end is in communication with the degassing cylinder.

[0009] A speed-regulating diaphragm pump is provided with an air inlet end and an air outlet end, the air inlet end is in communication with the atmosphere, the air outlet end is in communication with the degassing cylinder, and the speed-regulating diaphragm pump is used for cleaning the gas circuit of the oil-gas separation device and providing power for the degassing cylinder.

[0010] A main control module is electrically connected with the piston cylinder, the degassing cylinder, the degassing electromagnetic valve and the speed-regulating diaphragm pump, respectively.

[0011] Further, the piston cylinder comprises:

[0012] A piston is arranged inside the piston cylinder, and the piston forms an adjustable accommodating cavity between the inside of the piston cylinder and the piston top cover.

[0013] A piston connecting rod is fixedly connected to one end of the piston and connected to the other end of the motor.

[0014] The piston is sealed with the piston cylinder, and the motor can drive the piston connecting rod to move the piston in the piston cylinder.

[0015] A lead screw is arranged on the motor, the other end of the piston connecting rod is connected to the lead screw, and a lead screw nut is arranged between the other end of the piston connecting rod and the lead screw.

[0016] A limit switch is arranged on the moving path of the limit stop piece; the limit switch includes an upper limit switch and a lower limit switch for limiting the movement distance of the piston connecting rod and controlling the movement of the piston connecting rod within the upper limit switch and the lower limit switch.

[0017] Further, the speed-regulating diaphragm pump is a direct-current brushless motor speed-regulating diaphragm pump.

[0018] The air inlet end of the speed-regulating diaphragm pump is provided with a control filter for filtering the ambient air.

[0019] Further, the air filter is selected to be a 0.2 μm water-blocking filter membrane type filter.

[0020] Further, it further includes a vacuum breaking electromagnetic valve, one end of the vacuum breaking electromagnetic valve has a vacuum breaking port in communication with the external atmosphere, and the other end is in communication with the degassing cylinder for balancing the pressure inside the degassing cylinder.

[0021] The degassing cylinder includes a cylinder piston that can move inside the degassing cylinder to divide the degassing cylinder into an upper cavity and a lower cavity, and the other end of the degassing electromagnetic valve is in communication with the lower cavity.

[0022] The upper cavity of the degassing cylinder is provided with an interface, and the other end of the vacuum breaking electromagnetic valve is in communication with the interface.

[0023] The degassing cylinder is further provided with a cylinder pressure sensor in communication with the upper cavity; the degassing cylinder is an OEM standard cylinder structure.

[0024] The second aspect of the application also provides a control method of an oil-gas separation device, wherein the degassed gas is collected by a gas collection pipe, and the control method includes the following steps:

[0025] S1, acquire the state of the oil-gas separation device, determine whether the oil-gas separation device is reset to the initial state, if yes, continue to execute step S2;

[0026] S2, control the oil-gas separation device to perform gas path flushing and vacuum pumping;

[0027] S3, after confirming that the gas path is in a vacuum state, control the oil-gas separation device to perform oil path cleaning and oil sample quantification operation;

[0028] S4, after confirming that the oil sample quantification operation is completed, control the oil-gas separation device to perform multiple vacuum degassing treatments on the quantified oil sample;

[0029] S5, after confirming that the degassing is completed, control the oil-gas separation device to perform oil discharge.

[0030] Further, in the step S4, the vacuum degassing treatment performed by the oil-gas separation device specifically includes the following steps:

[0031] S41, after confirming that the oil sample quantification operation is completed, open the air breaking electromagnetic valve and the degassing electromagnetic valve, make the piston move upward first, pass through the limiting baffle, determine whether the piston reaches the upper limit switch position, if yes, control the piston to stop moving, and continue to execute step S42;

[0032] S42, close the degassing electromagnetic valve, control the piston to move downward, pass through the limiting baffle, determine whether the piston reaches the lower limit switch position, if yes, control the piston to stop moving, and continue to execute step S43;

[0033] S43, close the air breaking electromagnetic valve, open the degassing electromagnetic valve and the speed regulating diaphragm pump, acquire the data of the cylinder pressure sensor, control the speed and start-stop of the speed regulating diaphragm pump, control the pressure in the degassing cylinder to be within the range of 1.3-1.6 times of atmospheric pressure, at the same time, the air power and the negative pressure in the piston cylinder act together, so that the oil sample in the degassing cylinder rapidly flows back to the piston cylinder, and the gas rapidly degasses from the oil sample;

[0034] S44, determine whether the piston rod in the degassing cylinder returns to the initial position, if yes, close the degassing electromagnetic valve and the speed regulating diaphragm pump;

[0035] S45, control the oil-gas separation device to wait for a set time, open the transfer electromagnetic valve, the piston moves upward to the oil quantification position, close the transfer electromagnetic valve, complete the degassing operation, and record the degassing times.

[0036] Further, after the step S45, the following step is further included:

[0037] S46, acquire the current degassing times, determine whether the degassing times are greater than or equal to the set degassing times, if yes, acquire the pressure in the gas collection pipe for collecting the degassed gas;

[0038] S47, acquiring the pressure in the gas collection pipe through the gas path pressure sensor, judging whether the pressure in the gas collection pipe changes, if not, acquiring the duration of the pressure not changing;

[0039] S48, judging whether the preset time is exceeded according to the duration of the pressure not changing, if yes, determining that the vacuum degassing is completed.

[0040] The third aspect of the application also provides an oil sample concentration calculation method of an oil-gas separation device capable of realizing complete degassing, and the method comprises:

[0041] S100, collecting the degassed gas by using the gas collection pipe, acquiring the pressure in the degassed gas collection pipe, the volume of the gas collection pipe, the gas concentration in the gas collection pipe and the oil sample quantitative volume;

[0042] S200, according to the acquired pressure in the gas collection pipe, the volume of the gas collection pipe, the gas concentration in the gas collection pipe and the oil sample quantitative volume, the oil-gas concentration conversion model is brought into the set, and the concentration of the current oil sample is calculated;

[0043] The set oil-gas concentration conversion model is: CiL0=Cig*Ps / 101.3*Vs / VL;

[0044] Wherein, CiL0 is the oil sample concentration; Cig is the gas concentration in the gas collection pipe; Ps is the pressure 101.3kpa; Vs is the volume of the gas collection pipe; VL is the oil sample quantitative volume.

[0045] Compared with the prior art, the application has at least one of the following beneficial effects:

[0046] 1, the application integrates the piston cylinder, the degassing cylinder, the degassing electromagnetic valve, the speed regulating diaphragm pump and the gas collection pipe, and is controlled by the master control module, realizes the efficient oil-gas separation and automatic cleaning function, ensures the efficient separation and complete degassing effect of oil and gas, effectively improves the oil and gas treatment efficiency and the intelligent level of device operation; by using the speed regulating diaphragm pump to extract the environment air, the gas path in the oil-gas separation device is cleaned, and the power for the cylinder piston movement of the degassing cylinder is provided, the smoothness of the gas path and the stable power supply are realized, the carrier gas bottle or the gas generator design is replaced, the gas source is not dependent, the structure is compact, and the cost is saved.

[0047] 2、The application can realize the complete degassing of the characteristic gas components in the oil sample by designing a reasonable degassing frequency for the quantitative oil sample, degassing multiple times and collecting the gas, simplifying the mathematical model for calculating the oil sample concentration by the gas concentration, which is only related to the gas pressure in the gas collection pipe, the oil volume and the gas volume, realizing fast and efficient degassing, and no longer being affected by the oil type, the gas-liquid ratio, the oil temperature and the like. BRIEF DESCRIPTION OF DRAWINGS

[0048] Other features, objects and advantages of the application will become more apparent from the following detailed description of non-limiting embodiments, made with reference to the accompanying drawings:

[0049] Fig. 1 is a structural diagram of an oil-gas separation device capable of realizing complete degassing in an embodiment of the application.

[0050] Fig. 2 is a flowchart of a control method of the oil-gas separation device capable of realizing complete degassing in an embodiment of the application.

[0051] Fig. 3 is a flowchart of step S2 in a preferred embodiment of the application.

[0052] Fig. 4 is a flowchart of step S3 in a preferred embodiment of the application.

[0053] Fig. 5 is a flowchart of step S4 in a preferred embodiment of the application.

[0054] Fig. 6 is a flowchart of an oil sample concentration calculation method of the oil-gas separation device capable of realizing complete degassing in an embodiment of the application.

[0055] In the drawings: 1, motor; 2, screw rod; 3, screw nut; 4, piston connecting rod; 5, piston cylinder; 6, piston cylinder top cover; 7, piston; 8, heating sheet; 9, lower limit switch; 10, upper limit switch; 11, limit stopper; 12, degassing cylinder; 13, air breaking electromagnetic valve; 14, air breaking port; 15, cylinder pressure sensor; 16, oil inlet electromagnetic valve; 17, oil outlet electromagnetic valve; 18, degassing electromagnetic valve; 19, cylinder piston; 20, oil inlet pipeline joint; 21, oil return pipeline joint; 22, speed regulating diaphragm pump; 23, air filter; 24, flushing electromagnetic valve; 25, transfer electromagnetic valve; 26, gas path pressure sensor; 27, gas collection pipe; 28, exhaust electromagnetic valve; 29, exhaust port; 30, first detection auxiliary electromagnetic valve; 31, second detection auxiliary electromagnetic valve; 32, main control module. DETAILED DESCRIPTION

[0056] The application will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art to further understand the application, but do not limit the application in any form. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the application. These all belong to the protection scope of the application. The parts not described in detail in the embodiments of the application can be implemented with reference to the prior art.

[0057] Referring to FIG. 1, an oil-gas separation device in an embodiment of the application includes a piston cylinder 5, a degassing cylinder 12, a degassing electromagnetic valve 18, a speed-regulating diaphragm pump 22, and a main control module 32. The piston cylinder 5 is provided with a piston cylinder top cover 6 at one end and a motor 1 at the other end. The degassing cylinder 12 is in communication with one end of the piston cylinder 5. The degassing cylinder 12 and the piston cylinder 5 are provided with the degassing electromagnetic valve 18, one end of which extends into the interior of the piston cylinder 5, and the other end of which is in communication with the degassing cylinder 12. The speed-regulating diaphragm pump 22 is in communication with the atmosphere at the air inlet end and in communication with the degassing cylinder 12 at the air outlet end, and is used for cleaning the gas circuit of the oil-gas separation device and providing power for the cylinder piston 19 of the degassing cylinder 12. The main control module 32 is electrically connected with the piston cylinder 5, the degassing cylinder 12, the degassing electromagnetic valve 18, and the speed-regulating diaphragm pump 22, respectively.

[0058] In the above embodiment of the application, the piston cylinder 5 is used for placing a quantitative oil sample. After the quantitative oil sample in the piston cylinder 5 enters the degassing cylinder 12, the degassing electromagnetic valve 18, the speed-regulating diaphragm pump 22, and the gas collection pipe 27 are controlled by the main control module 32. A very high vacuum environment is created by the piston cylinder 5. The piston cylinder 5 and the degassing cylinder 12 cooperate to make the oil sample flow in the piston cylinder 5 and the degassing cylinder 12. Under the condition of high pressure difference, a plurality of fine streams are formed and drop, and the gas in the quantitative oil sample is subjected to vacuum degassing treatment. The efficient oil-gas separation is realized, the efficient separation and complete degassing effect of the oil-gas are ensured, and the oil-gas treatment efficiency and the intelligent level of the device operation are effectively improved.

[0059] In the above embodiment of the application, the speed-regulating diaphragm pump 22 is used to extract ambient air to clean the gas circuit of the oil-gas separation device and provide power for the movement of the cylinder piston 19 of the degassing cylinder 12. The oil-gas separation device has an automatic cleaning function, the smoothness of the gas circuit and the stable supply of power are realized, the design of the carrier gas bottle or the gas generator is replaced, the oil-gas separation device does not depend on the gas source, the structure is compact, and the cost is saved.

[0060] In order to avoid the oil and gas separation from the outside temperature too much influence, in some possible embodiments, the piston cylinder 5 is wrapped with heating sheet 8 for controlling the temperature in the piston cylinder 5. Specifically, in an embodiment, by wrapping a layer of heating sheet 8 on the outside of the piston cylinder 5, the oil and gas separation device is consistent in the temperature in the piston cylinder 5 during the degassing process, avoiding the influence of the outside temperature. Of course, in other embodiments, the heating sheet 8 can also be other forms.

[0061] In order to achieve efficient degassing, in some possible embodiments, the degassing cylinder 12 can adopt a standard cylinder structure, which can be a standard cylinder structure of OEM model, and through the customized volume and assembly size, good air tightness and piston movement performance can be achieved, and air can be used as power to accelerate the movement of the cylinder piston 19, and cooperate with the piston cylinder 5 to achieve high-efficiency degassing mode. Of course, in other embodiments, the degassing cylinder 12 can also be other structural forms, as long as the above technical purposes can be achieved.

[0062] In order to avoid the influence of air impurities on the oil and gas separation effect, in some possible embodiments, the air inlet end of the speed regulating diaphragm pump 22 is provided with an air filter 23.

[0063] In some possible embodiments, the speed regulating diaphragm pump 22 can be selected as a direct-current brushless motor speed regulating diaphragm pump, and the service life of this type of speed regulating diaphragm pump can exceed 8000 hours. An air filter 23 is installed at the inlet of the speed regulating diaphragm pump 22, and the air filter 23 can be selected as a 0.2um water-blocking filter membrane type filter. The filter of this size can better filter the ambient air, and ensure that the device is clean and free of impurities. Of course, the above selection is only preferred in the present application, and in other embodiments, other models of speed regulating diaphragm pumps 22 and air filters 23 can also be selected according to the actual use environment.

[0064] In the above embodiments of the present application, the air filter 23 filters air impurities, and the speed regulating diaphragm pump 22 extracts the filtered clean ambient air to clean the gas path in the oil and gas separation device and provide power for the movement of the degassing cylinder 12, which is beneficial to improve the final oil and gas separation effect.

[0065] In some possible embodiments, the piston cylinder 5 includes a piston 7 and a piston connecting rod 4. Preferably, the motor 1 is a lead screw stepper motor. In the present embodiment, the piston 7 is located inside the piston cylinder 5, and the piston 7 forms an adjustable containing cavity between the inside of the piston cylinder 5 and the piston cylinder top cover 6. One end of the piston connecting rod 4 is fixedly connected with the piston 7, and the other end is connected with the motor 1. The motor 1 is sealed by the piston 7 and the piston cylinder 5, and the motor 1 can drive the piston connecting rod 4 to move the piston 7 in the piston cylinder 5. The motor 1 is provided with a lead screw 2, the other end of the piston connecting rod 4 is connected with the lead screw 2, and a lead screw nut 3 is arranged between the other end of the piston connecting rod 4 and the lead screw 2.

[0066] In operation, the main control module 32 controls the operation of the speed regulating diaphragm pump 22, the air inlet end inhales fresh air from the atmosphere, the air is sent into the degassing cylinder 12 through the air outlet end, and the gas collection pipe 27 is used to clean the gas circuit of the oil-gas separation device. After cleaning is completed, a start signal is sent to the motor 1, the motor 1 starts to drive the piston 7 in the piston cylinder 5 to reciprocate, forming a cycle of compression and release, thereby helping the oil-gas mixture to be preliminarily separated in the piston cylinder 5. After the oil-gas mixture enters the piston cylinder 5, due to the movement of the piston 7, the oil and the gas begin to separate under the physical action. The heavier oil is left in the piston cylinder 5, and the gas moves to the degassing cylinder 12 through the specifically designed pipeline; when the gas reaches the degassing electromagnetic valve 18 between the degassing cylinder 12 and the piston cylinder 5, if the main control module 32 determines that it is suitable to perform degassing operation at this time, the degassing electromagnetic valve 18 is controlled to be opened, allowing the gas to enter the degassing cylinder 12, and realizing oil-gas separation.

[0067] The piston cylinder 5 is internally provided with the piston 7, and the piston 7 is sealed by a sealing ring, so that the piston 7 and the piston cylinder top cover 6 form a space with adjustable volume.

[0068] In some possible embodiments, the lead screw nut 3 is provided with a limiting baffle 11, and the limiting baffle 11 can move with the piston connecting rod 4. Preferably, a limiting switch is arranged on the movement path of the limiting baffle 11. The limiting switch includes an upper limiting switch 10 and a lower limiting switch 9, which are used to limit the movement distance of the piston connecting rod 4 and control the piston connecting rod 4 to move within the upper limiting switch 10 and the lower limiting switch 9.

[0069] In the above embodiments, by arranging the limiting baffle 11 on the lead screw nut 3 and the limiting switch (including the upper limiting switch 10 and the lower limiting switch 9) on the movement path of the limiting baffle 11, the movement distance of the piston connecting rod 4 is accurately controlled. When the piston connecting rod 4 moves with the rotation of the lead screw nut 3 in operation, the limiting baffle 11 moves accordingly. When the limiting baffle 11 touches the upper limiting switch 10 or the lower limiting switch 9, the limiting switch sends a signal to the main control module 32, and the main control module 32 controls the motor 1 to stop or reverse accordingly, thereby preventing the piston connecting rod 4 from exceeding the predetermined movement range, realizing the stability and safety of the operation of the oil-gas separation device, avoiding mechanical damage or operation failure caused by excessive movement of the piston connecting rod 4, and improving the service life and reliability of the equipment.

[0070] In some possible embodiments, the piston cylinder top cover 6 is provided with an oil inlet electromagnetic valve 16, an oil discharge electromagnetic valve 17, a transfer electromagnetic valve 25 and an exhaust electromagnetic valve 28 which are in communication with the inside of the piston cylinder 5. The oil inlet electromagnetic valve 16 and the oil discharge electromagnetic valve 17 are connected with the oil inlet pipeline joint 20 and the oil return pipeline joint 21 respectively, and are used to realize oil sample exchange. The exhaust electromagnetic valve 28 is in communication with the external atmosphere.

[0071] Specifically, the top of the piston cylinder 5 is equipped with a piston cylinder top cover 6, four sides of the piston cylinder top cover 6 are respectively equipped into an oil inlet electromagnetic valve 16, an oil outlet electromagnetic valve 17, a transfer electromagnetic valve 25 and an exhaust electromagnetic valve 28, the top of the piston cylinder top cover 6 is equipped with a degassing electromagnetic valve 18, all of which are in communication with the inner cavity of the piston cylinder 5, the oil inlet electromagnetic valve 16 and the oil outlet electromagnetic valve 17 are in communication with an oil inlet pipeline joint 20 and an oil return pipeline joint 21, an external transformer (not marked in the figure) or an oil sample container (not marked in the figure) is in communication with the oil inlet pipeline joint 20 and the oil return pipeline joint 21 through a connecting pipeline, so as to realize oil sample exchange; the outlet of the exhaust electromagnetic valve 28 is in communication with an exhaust port 29 and communicates with the atmosphere; the piston cylinder 5 is wrapped with a layer of heating sheet 8, which can control the heating of the piston cylinder 5; the piston 7 is equipped with a piston connecting rod 4, which is connected with a screw rod 2 through a screw nut 3, the screw rod step motor is integrated with the screw rod 2; the screw nut 3 is equipped with a limit stop 11 through a structural connecting piece (not shown in the figure), the screw rod step motor drives the piston 7 to move up and down, the limit stop 11 moves synchronously, and the movement path of the limit stop 11 is equipped with an upper limit switch 10 and a lower limit switch 9 at both ends respectively, to control the limit stroke of the piston 7.

[0072] In some possible embodiments, the oil-gas separation device can further include a gas path pressure sensor 26, a first auxiliary detection electromagnetic valve, a second auxiliary detection electromagnetic valve and a flushing electromagnetic valve 24. The gas path pressure sensor 26 is connected with one end of a gas collection pipe 27 for detecting the pressure inside the gas collection pipe 27. The first detection auxiliary electromagnetic valve 30 and the second detection auxiliary electromagnetic valve 31 are equipped at both ends of the gas collection pipe 27 for auxiliary control of the on-off of the gas path. One end of the flushing electromagnetic valve 24 is connected with the gas outlet end of the speed regulating diaphragm pump 22, and the other end is connected with the other end of the gas collection pipe 27.

[0073] As shown in FIG. 1, one end of the gas collection pipe 27 is respectively in communication with the flushing electromagnetic valve 24 and the first detection auxiliary electromagnetic valve 30, and the other end is respectively in communication with the transfer electromagnetic valve 25 and the second detection auxiliary electromagnetic valve 31, and is provided with the gas path pressure sensor 26 for detecting the pressure inside the gas collection pipe 27.

[0074] During operation, the gas collection pipe 27 is responsible for collecting gas from the oil-gas separation device, and the gas path pressure sensor 26 monitors the pressure inside the gas collection pipe 27 in real time to ensure that the collection process is carried out within a safe pressure range, and the first detection auxiliary electromagnetic valve 30 and the second detection auxiliary electromagnetic valve 31 flexibly control the on-off of the gas path according to the instructions of the main control module 32 to meet different collection requirements.

[0075] When the gas collection pipe 27 needs to be cleaned, the flushing solenoid valve 24 is opened, and the compressed air provided by the speed regulating diaphragm pump 22 enters the gas collection pipe 27 through the flushing solenoid valve 24, effectively removing the residual oil gas or other impurities in the pipe, improving the accuracy and reliability of gas collection, prolonging the service life of the gas collection pipe 27 through timely cleaning and maintenance, reducing maintenance costs, and ensuring the quality of subsequent gas treatment.

[0076] In some possible embodiments, the oil-gas separation device further comprises a break vacuum solenoid valve 13 and a cylinder pressure sensor 15. The break vacuum solenoid valve 13 has a break vacuum port 14 at one end for communication with the external atmosphere, and is in communication with the degassing cylinder 12 at the other end for balancing the pressure inside the degassing cylinder 12. The degassing cylinder 12 comprises a cylinder piston 19 movable inside the degassing cylinder 12 to divide the degassing cylinder 12 into an upper cavity and a lower cavity, and the other end of the degassing solenoid valve 18 is in communication with the lower cavity. The cylinder pressure sensor 15 is arranged on the degassing cylinder 12 for communication with the upper cavity. The upper cavity of the degassing cylinder 12 is provided with an interface, and the other end of the break vacuum solenoid valve 13 is in communication with the interface.

[0077] The above embodiments of the present application further enhance the control ability of the oil-gas separation device over the pressure inside the degassing cylinder 12 by introducing the break vacuum solenoid valve 13 and the cylinder pressure sensor 15. When the pressure inside the degassing cylinder 12 abnormally rises, the main control module 32 will control the break vacuum solenoid valve 13 to open, and communicate with the external atmosphere through the break vacuum port 14, thereby rapidly balancing the pressure inside the degassing cylinder 12 and avoiding mechanical failure or safety hazards that may be caused by excessively high pressure. At the same time, the cylinder pressure sensor 15 monitors the pressure of the upper cavity of the degassing cylinder 12 in real time and feeds back the data to the main control module 32, so that the main control module 32 can more accurately judge the working state of the degassing cylinder 12 and adjust the actions of the break vacuum solenoid valve 13 or other control elements accordingly, to realize more refined pressure control, improve the safety and stability of the oil-gas separation device, and reduce the influence of pressure fluctuations on the separation effect.

[0078] Specifically, the degassing cylinder 12 has an interface (not labeled in the figure) at the bottom for threaded connection with a connecting pipeline (not shown in the figure) for communication with the degassing solenoid valve 18 through the connecting pipeline; an upper interface (not labeled in the figure) connects the break vacuum solenoid valve 13 and the cylinder pressure sensor 15 for measuring the pressure of the upper cavity of the cylinder piston 19, and is in communication with the outlet of the speed regulating diaphragm pump 22; the break vacuum solenoid valve 13 connects the break vacuum port 14 for communication with the external atmosphere.

[0079] The main control module 32 in the application is electrically connected with the electromagnetic valves (including the oil inlet electromagnetic valve 16, the oil discharge electromagnetic valve 17, the transfer electromagnetic valve 25, the exhaust electromagnetic valve 28, the degassing electromagnetic valve 18, the flushing electromagnetic valve 24, the first detection auxiliary electromagnetic valve 30, and the second detection auxiliary electromagnetic valve 31) in the device, the speed regulating diaphragm pump 22, the screw stepping motor, the heating sheet 8, and the pressure sensors (including the gas path pressure sensor 26 and the cylinder pressure sensor 15), so as to realize the functions of process control, software algorithm, and external communication.

[0080] Referring to FIG. 2, a control method of the oil-gas separation device capable of realizing complete degassing is provided in an embodiment of the application. The oil-gas separation device is the oil-gas separation device capable of realizing complete degassing in any of the above embodiments. Specifically, the control method comprises the following steps:

[0081] S1, obtaining the state of the oil-gas separation device, determining whether the oil-gas separation device is reset to the initial state, and if so, continuing to execute step S2.

[0082] S2, controlling the oil-gas separation device to perform gas path flushing and vacuum pumping.

[0083] S3, after confirming that the gas path is in a vacuum state, controlling the oil-gas separation device to perform oil path cleaning and oil sample quantification operation.

[0084] S4, after confirming that the oil sample quantification operation is completed, controlling the oil-gas separation device to perform multiple vacuum degassing treatments on the quantified oil sample.

[0085] S5, after confirming that the degassing is completed, controlling the oil-gas separation device to perform oil discharge.

[0086] In the oil-gas separation process of the application, the state of the oil-gas separation device is first obtained by the main control module 32, and it is determined whether the oil-gas separation device is reset to the initial state. After it is determined that the oil-gas separation device is already in the initial state, the gas path in the oil-gas separation device is then flushed to avoid the influence of residual gas or impurities in the gas path on the separated gas during the separation process. After the flushing is completed, the gas path is then vacuum pumped to prepare for subsequent oil-gas separation operation. Then, after confirming that the gas path reaches the vacuum state, the oil path is cleaned and the oil sample is quantified to ensure that the purity and quantity of the oil sample meet the analysis requirements. Then, the quantified oil sample is subjected to multiple vacuum degassing treatments to remove the dissolved gas in the oil and improve the accuracy of oil sample analysis. Finally, after the degassing operation is completed, the device is controlled to discharge the oil for the next round of operation or to collect the processed oil sample. Through the fine operation steps, the efficient and stable operation of the oil-gas separation device is ensured, and the precision and reliability of the oil sample analysis are improved.

[0087] By setting the control method matched with the oil-gas separation device, designing the reasonable degassing times for the quantitative oil sample, and accumulating the collected gas through multiple degassing, the characteristic gas components in the oil sample can be completely degassed, the mathematical model for calculating the oil sample concentration through the gas concentration is simplified, and only related to the gas pressure in the gas collection pipe 27, the oil volume, and the gas path volume, so that the rapid and efficient degassing is realized, and the oil type, gas-liquid ratio, oil temperature, and the like no longer affect the degassing.

[0088] The normal initial state is characterized by: (1) the cylinder pressure sensor 15 indicates the gas pressure data for driving the cylinder to move, and the cylinder pressure is atmospheric pressure ± 10%; (2) the position of the piston 7 in the piston cylinder 5 is the upper limit position of the piston 7; and (3) all electromagnetic valves and brushless speed-regulating diaphragm pumps 22 are in the closed state.

[0089] The oil path in the oil-gas separation device includes the pipelines connected between the piston cylinder 5 and the oil inlet electromagnetic valve 16, the oil outlet electromagnetic valve 17, the degassing electromagnetic valve 18, and the oil outlet electromagnetic valve 17.

[0090] In step S1, when it is judged that the oil-gas separation device is in the initial state, the following operations are performed to reset the initial state of the device:

[0091] (1) Close all electromagnetic valves and brushless speed-regulating diaphragm pumps 22.

[0092] (2) Check the signal of the cylinder pressure sensor 15, if the signal exceeds atmospheric pressure ± 10%, open the air breaking electromagnetic valve 13, and after the signal is normal, close the air breaking electromagnetic valve 13.

[0093] (3) Judge the position of the piston 7:

[0094] If the position of the piston 7 is the upper limit position of the piston 7, the operation is completed.

[0095] If the position of the piston 7 is not the upper limit position of the piston 7, open the oil outlet electromagnetic valve 17, the piston 7 moves downward, and when the piston 7 reaches the upper limit position of the piston 7, stop and close the oil outlet electromagnetic valve 17, and the operation is completed.

[0096] As shown in FIG. 3, in some possible embodiments, in step S2, the oil-gas separation device is controlled to perform gas path flushing, including the following steps:

[0097] S21, under the condition that the position of the piston 7 is the upper limit position of the piston 7, close the oil inlet electromagnetic valve 16, the oil outlet electromagnetic valve 17, the degassing electromagnetic valve 18, and the air breaking electromagnetic valve 13, open the flushing electromagnetic valve 24, the transfer electromagnetic valve 25, and the exhaust electromagnetic valve 28, open the speed-regulating diaphragm pump 22, and absorb the ambient air through the air filter 23 to flush the gas path, and along the path through the gas collection pipe 27, discharge the gas to the outside.

[0098] S22, control the rotation speed of the speed regulating diaphragm pump 22 to make the air flow of the cleaning gas path in the range of 500-800 mL / min, gradually replace the residual gas in the gas path with dry and clean ambient air, wait for 30 seconds, and then close the speed regulating diaphragm pump 22, the flushing solenoid valve 24, the transfer solenoid valve 25, and the exhaust solenoid valve 28.

[0099] The air flow and the waiting time can be changed as needed, and the above ranges are not limited.

[0100] In some possible embodiments, after step S22, after judging that the gas path flushing is completed, a vacuum operation is further performed on the gas path, specifically including the following steps:

[0101] S23, when the piston 7 position is the upper limit position, close all the solenoid valves, open the transfer solenoid valve 25 and the degassing solenoid valve 18, the piston 7 moves downward, stops when reaching the lower limit position of the piston 7, closes the transfer solenoid valve 25 and the degassing solenoid valve 18, opens the exhaust solenoid valve 28, and the piston 7 moves upward, stops when reaching the upper limit position of the piston 7, and closes the exhaust solenoid valve 28.

[0102] As shown in FIG. 4, in some possible embodiments, after step S3, confirming that the gas path is in a vacuum state, the oil-gas separation device is controlled to clean the oil path and perform oil sample quantification, specifically including the following steps:

[0103] S31, first clean the oil path, when the piston 7 position is the upper limit position of the piston 7, open the oil inlet solenoid valve 16, the piston 7 runs downward to the oil circulation position, stops the piston 7, closes the oil inlet solenoid valve 16 after completing oil inlet, opens the air breaking solenoid valve 13 and the degassing solenoid valve 18, and the piston 7 moves upward, stops when reaching the oil quantification position, in the process, the piston rod (not shown in the figure) of the degassing cylinder 12 rises under the action of oil pressure, and the oil sample volume in the cylinder increases.

[0104] In the above process, the piston 7 in the piston cylinder 5 moves downward, a negative pressure is formed in the piston cylinder 5, and the oil sample in the degassing cylinder 12 flows back to the piston cylinder 5 under the action of the negative pressure and gravity, and the piston rod in the degassing cylinder 12 falls back to the initial position.

[0105] S32, after the piston connecting rod 4 stops when reaching the lower limit position of the piston 7, close the degassing solenoid valve 18 and the air breaking solenoid valve 13, open the oil outlet solenoid valve 17, the piston 7 moves upward, stops when the piston 7 reaches the upper limit position of the piston 7, and closes the oil outlet solenoid valve 17.

[0106] After performing the above steps S31 and S32, the above process is repeated for a set number of times N.

[0107] Preferably, the value of N ranges from 3 to 10.

[0108] After the oil line flushing is completed in step S32, the following step is included: quantifying the oil sample

[0109] S33, under the condition that the position of the piston 7 is the upper limit position of the piston 7, the oil inlet electromagnetic valve 16 is opened, the piston 7 runs downward to the oil circulation position, the piston 7 stops, after the oil inlet is completed, the oil inlet electromagnetic valve 16 is closed, the oil outlet electromagnetic valve 17 is opened, the piston 7 moves upward, and the piston 7 stops after reaching the oil quantification position, and the oil outlet electromagnetic valve 17 is closed.

[0110] The upper limit position and the lower limit position are signals emitted when the limit stopper 11 moves to the upper limit switch 10 and the lower limit switch 9, respectively.

[0111] The effective volume in the piston cylinder 5 is designed to be 125 mL, the oil quantification volume is 25 mL, the inner diameter of the piston cylinder 5 is 40 mm, the degassing cylinder 12 is a custom model from a cylinder manufacturer, and the maximum sample volume is 50 mL.

[0112] The piston 7 in the piston cylinder 5 moves vertically up and down under the driving of the lead screw stepper motor. For the convenience of describing the running process, several key positions of the piston 7 in the piston cylinder 5 are defined:

[0113] (1) The upper limit position of the piston 7: the extreme position of the upward movement of the piston 7, which is controlled by the upper limit switch 10. The piston 7 runs upward until the limit stopper 11 triggers the upper limit switch 10. The main control module 32 receives this signal and immediately stops the piston 7. The position of the piston 7 is automatically reset to 0. This position is the reference zero point of the position of the piston 7, corresponding to a volume of 0 mL.

[0114] (2) The lower limit position of the piston 7: the extreme position of the downward movement of the piston 7, which is controlled by the lower limit switch 9. The piston 7 runs downward until the limit stopper 11 triggers the lower limit switch 9. The main control module 32 receives this signal and immediately stops the piston 7, corresponding to a volume of 125 mL.

[0115] (3) The oil quantification position: controlled by the number of steps of the lead screw stepper motor, about 20 mm, corresponding to a volume of 25 mL.

[0116] (4) The oil circulation position: controlled by the number of steps of the lead screw stepper motor, about 60 mm, corresponding to a volume of 75 mL.

[0117] ​​​​​​​​​​​The piston 7 movement is controlled by the master module 32: the piston 7 position is calculated, the absolute position of the piston 7 is calculated in real time during the movement of the piston 7 according to the running frequency and the step number of the motor 1, and the piston 7 position is taken as the reference zero point; the piston 7 position positioning is realized by controlling the piston 7 movement to the specified position through the step number of the screw stepper motor, and the control precision of the piston 7 movement distance is less than 0.1 mm; the piston 7 running limit control is realized by immediately controlling the piston 7 to stop when the piston 7 upward movement triggers the upper limit switch 10 signal or the piston 7 downward movement triggers the lower limit switch 9 signal.

[0118] As shown in FIG. 5, in step S4, the control of the oil-gas separation device for vacuum degassing treatment specifically includes the following steps:

[0119] S41, confirming that the oil sample quantitative operation is completed, opening the emptying electromagnetic valve 13 and the degassing electromagnetic valve 18, and moving the piston 7 upward first, passing through the limit stop 11, judging whether the piston 7 reaches the position of the upper limit switch 10, if yes, controlling the piston 7 to stop moving, and continuing to execute step S42.

[0120] S42, closing the degassing electromagnetic valve 18, controlling the piston 7 to move downward, passing through the limit stop 11, judging whether the piston 7 reaches the position of the lower limit switch 9, if yes, controlling the piston 7 to stop moving, and continuing to execute step S43.

[0121] S43, closing the emptying electromagnetic valve 13, opening the degassing electromagnetic valve 18 and the speed regulating diaphragm pump 22, acquiring the data of the cylinder pressure sensor 15, controlling the rotation speed and start-stop of the speed regulating diaphragm pump 22, controlling the pressure in the degassing cylinder 12 to be in the range of 1.3-1.6 times atmospheric pressure, and simultaneously, the air power and the negative pressure in the piston cylinder 5 act together to make the oil sample in the degassing cylinder 12 flow back to the piston cylinder 5 rapidly, and the gas is rapidly separated from the oil sample.

[0122] S44, judging whether the piston rod in the degassing cylinder 12 returns to the initial position, if yes, closing the degassing electromagnetic valve 18 and the speed regulating diaphragm pump 22.

[0123] S45, controlling the oil-gas separation device to wait for a set time, opening the transfer electromagnetic valve 25, moving the piston 7 upward to the oil quantitative position, closing the transfer electromagnetic valve 25, completing the degassing operation, and recording the degassing times.

[0124] Specifically, when vacuum degassing is performed, the initial piston 7 position is the oil dosing position, the air breaking electromagnetic valve 13 and the degassing electromagnetic valve 18 are opened, the piston 7 moves upward, stops after reaching the upper limit position of the piston 7, the degassing electromagnetic valve 18 is closed, the piston 7 moves downward, stops after reaching the lower limit position of the piston 7, the air breaking electromagnetic valve 13 is closed, the degassing electromagnetic valve 18 and the speed regulating diaphragm pump 22 are opened, the gas flows into the chamber above the piston of the degassing cylinder 12, forms an air power, accelerates the falling of the piston rod, controls the speed and start-stop of the speed regulating diaphragm pump 22 through the data of the cylinder pressure sensor 15, and controls the pressure data in the range of 1.3-1.6 times of atmospheric pressure. The air power and the negative pressure in the piston cylinder 5 act together to make the oil sample in the degassing cylinder 12 flow back to the piston cylinder 5 quickly, and the gas is quickly degassed from the oil sample. The piston cylinder top cover 6 is designed with a special oil flow passage, and the degassing efficiency is obviously better than that of the straight-through hole and the spraying scheme. The piston rod in the degassing cylinder 12 returns to the initial position, and the degassing electromagnetic valve 18 and the speed regulating diaphragm pump 22 are closed. After continuing to wait for 30s, the transfer electromagnetic valve 25 is opened, the piston 7 moves upward to the oil dosing position, the transfer electromagnetic valve 25 is closed, and the degassing process is completed.

[0125] The present application greatly accelerates the degassing speed of the gas in the oil sample by utilizing the dual action of air power and negative pressure in the piston cylinder 5, is more effective than the traditional straight-through hole or spraying scheme, significantly improves the degassing efficiency, utilizes the cylinder pressure sensor 15 to monitor and control the speed and start-stop of the speed regulating diaphragm pump 22 in real time, ensures that the pressure in the degassing cylinder 12 is always maintained in the ideal range of 1.3-1.6 times of atmospheric pressure during the degassing process, guarantees the degassing effect, and avoids the problems of equipment damage or incomplete degassing caused by excessively high or low pressure; the entire degassing process is realized through the precise control of automatic equipment such as electromagnetic valves and speed regulating diaphragm pumps 22, reduces the need for manual operation, improves work efficiency, and reduces human error.

[0126] In some possible implementations, after step S45, the following steps are further included:

[0127] S46, obtaining the current degassing times, judging whether the degassing times are greater than or equal to the set degassing times, if yes, obtaining the pressure in the gas collection pipe 27;

[0128] S47, obtaining the pressure in the gas collection pipe 27 through the gas path pressure sensor 26, judging whether the pressure in the gas collection pipe 27 changes, if no, obtaining the duration of the unchanged pressure;

[0129] S48, judging whether the duration of the unchanged pressure exceeds the preset time according to the duration of the unchanged pressure, if yes, determining that the vacuum degassing is completed.

[0130] In the above process, one specific embodiment is to obtain the current degassing times and compare it with the preset degassing times to ensure that the required degassing cycle times are reached or exceeded, ensuring that the degassing process is fully carried out and effectively removes impurities or dissolved gas in the gas. After the degassing times reach the preset degassing times, it indicates that the current oil sample has completed degassing.

[0131] In the above process, one specific embodiment is to obtain the current degassing times and compare it with the preset degassing times to ensure that the required degassing cycle times are reached or exceeded, ensuring that the degassing process is fully carried out and effectively removes impurities or dissolved gas in the gas. After the degassing times reach the preset degassing times, it indicates that the current oil sample has completed degassing.

[0132] In the above process, another specific embodiment is to first obtain the current degassing times and compare it with the preset degassing times to ensure that the required degassing cycle times are reached or exceeded, ensuring that the degassing process is fully carried out. Then, the pressure change in the gas collection tube 27 is monitored in real time by the gas path pressure sensor 26 to detect the degassing effect. If the pressure remains stable for a period of time, it indicates that most or all of the removable gas components in the oil sample have been removed, and the system then calculates and records this period of time. Finally, if the time during which the pressure does not change exceeds the preset threshold, it is determined that the vacuum degassing operation has been completed. An accurate and automated degassing completion determination mechanism is provided, reducing human intervention and improving work efficiency and degassing quality, ensuring the accuracy and reliability of subsequent experiments or production.

[0133] More specifically, after repeating the degassing process M times, the pressure in the gas collection tube 27 is detected to gradually increase and tend to be stable, and the multiple degassing gases are collected. After completing degassing, the gas pressure in the gas collection tube 27, the oil volume, and the gas path volume are recorded as parameters for converting gas concentration to oil concentration.

[0134] In the above process, one specific embodiment is to obtain the current degassing times and compare it with the preset degassing times to ensure that the required degassing cycle times are reached or exceeded, ensuring that the degassing process is fully carried out and effectively removes impurities or dissolved gas in the gas. After the degassing times reach the preset degassing times, it indicates that the current oil sample has completed degassing.

[0135] In the above process, another specific embodiment is to first obtain the current degassing times and compare it with the preset degassing times to ensure that the required degassing cycle times are reached or exceeded, ensuring that the degassing process is fully carried out. Then, the pressure change in the gas collection tube 27 is monitored in real time by the gas path pressure sensor 26 to detect the degassing effect. If the pressure remains stable for a period of time, it indicates that most or all of the removable gas components in the oil sample have been removed, and the system then calculates and records this period of time. Finally, if the time during which the pressure does not change exceeds the preset threshold, it is determined that the vacuum degassing operation has been completed. An accurate and automated degassing completion determination mechanism is provided, reducing human intervention and improving work efficiency and degassing quality, ensuring the accuracy and reliability of subsequent experiments or production.

[0136] Specifically, it includes obtaining the pressure data detected by the gas path pressure sensor 26, generating a pressure change curve, determining whether the pressure change curve tends to be stable, if so, obtaining the duration of the pressure curve tending to be stable, determining whether the duration exceeds the set time, if so, obtaining the relevant parameters of the oil sample during the degassing process, bringing the obtained relevant parameters into the set degassing rate calculation model, calculating whether the degassing rate of the current oil sample reaches the set degassing rate, if so, determining that the degassing is completed.

[0137] In the above embodiment, the degassing calculation model is set as: ηi = 1 / (1 + Ki / β);

[0138] Wherein: ηi is the degassing rate, Ki is the gas distribution coefficient of the oil sample at a constant temperature, and β is the gas-liquid ratio = Vg / VL, wherein: VL is the volume of the oil sample, and Vg is the volume of the gas phase.

[0139] According to the above embodiment, by theoretically calculating and designing the degassing times, almost all of the characteristic gas components in the oil sample can be degassed, the mathematical model for inversely calculating the oil sample concentration from the gas concentration is greatly simplified, and only related to the gas pressure in the gas collection pipe 27, the oil quantitative volume, and the gas path volume, and no longer affected by the oil variety, the gas-liquid ratio, the oil temperature, and the like.

[0140] The oil temperature during the degassing process is constant at Td, the gas distribution coefficient Ki at this temperature is also called the Ostwald coefficient, and the Ki is generally obtained by consulting the standard.

[0141] When the gas-liquid equilibrium is reached during the degassing process: the volume of the oil sample is VL, the volume of the gas phase is Vg, and the gas-liquid ratio β = Vg / VL is specified.

[0142] The degassing rate ηi represents the percentage of the amount of gas degassed from the oil at the degassing equilibrium to the total amount of gas in the oil before degassing. ηi = 1 / (1 + Ki / β)

[0143] After the nth degassing: ηi (n) = 1-1 / (1+β / Ki) n

[0144] According to the gas distribution coefficient of the domestic mineral insulating oil at 50°C in the standard, see Table 1 below, the gas-liquid ratio is designed to be 4. Assuming that the degassing oil temperature is 50°C, the degassing rate of multiple degassing is theoretically calculated, see Table 2 below. It can be seen that the degassing rate of the lowest ethane component is about 63% at the first degassing equilibrium, and the degassing rate is about 98% at the fourth degassing equilibrium. According to the theoretical calculation and design margin, the degassing times are designed, so that the concentration in the oil after multiple degassing equilibrium is close to 0, and the degassing rate is close to 100%.

[0145] Table 1: Gas distribution coefficient (Ki) of domestic mineral insulating oil at 50°C

[0146] Table 2

[0147] The above embodiments can be used in combination.

[0148] In some possible implementation manners, after confirming that the degassing is completed in step S5, the oil-gas separation device is controlled to perform oil discharge, specifically including: the initial position of the piston 7 is the oil dosing position, the piston 7 moves upward, the oil discharge electromagnetic valve 17 is opened, the piston 7 stops after reaching the upper limit position, the oil discharge electromagnetic valve 17 is closed, and one oil-gas separation process is completed.

[0149] Referring to FIG. 6, an oil sample concentration calculation method of an oil-gas separation device capable of complete degassing is provided in an embodiment of the present application. The oil sample concentration is theoretically calculated according to the gas concentration in the gas collection pipe 27 of the oil-gas separation device.

[0150] After the oil-gas separation device completes the oil-gas separation process, the first detection auxiliary electromagnetic valve 30 and the second detection auxiliary electromagnetic valve 31 are controlled to act, and the external carrier gas is pushed or the vacuum pump is pumped to vacuum, so as to transfer the gas in the gas collection pipe 27 to the detection module, detect the gas concentration, and then use the oil sample concentration calculation method designed in the present application to inversely calculate the oil sample concentration from the gas concentration. The oil sample concentration calculation method does not need to correct the concentration calculation method of the degassing rate. By measuring the gas concentration in the gas collection pipe 27, the oil concentration under standard conditions (101.3 kpa, 20℃) can be calculated only according to the pressure, volume and oil dosing volume in the gas collection pipe 27 after the degassing is completed. The data accuracy does not depend on the detection accuracy of the gas distribution coefficient, oil temperature and gas-liquid ratio, and is not limited by the oil sample variety.

[0151] For example, in the initial state: under standard conditions, the oil sample volume is VL, the gas phase volume is 0, the oil sample concentration is CiL0, the pressure is 101.3 kpa, and the oil temperature is 20℃; the gas concentration in the gas collection pipe 27 is 0 (except for oxygen and nitrogen).

[0152] When the gas-liquid equilibrium is reached during the degassing process: the oil sample volume is VL, after N times of degassing, the oil sample degassing rate is 100%, the volume of the gas collection pipe 27 is Vs, the pressure is Ps, the temperature is 20℃, and the gas concentration is Cig (except for oxygen and nitrogen).

[0153] The oil gas concentration calculation formula: CiL0=Cig*Ps / 101.3*Vs / VL

[0154] Wherein: CiL0: oil sample concentration; Cig: gas concentration; Ps: pressure in the gas collection pipe 27; Vs: volume of the gas collection pipe 27; VL: oil sample volume.

[0155] The gas concentration in the gas collection tube 27 is measured by the detection module, and the concentration in the oil under standard conditions (101.3 kPa, 20 DEG C) can be calculated according to the pressure and volume in the gas collection tube 27 after degassing and the oil quantitative volume. In the example, the volume of the gas collection tube 27 is Vs=3 mL, the oil quantitative volume is VL=25 mL, the pressure in the gas collection tube 27 after degassing of the designated oil sample is complete is Ps=67 kPa, and CiL0=Cig*0.079 is calculated. The oil sample concentration can be calculated very simply using the gas concentration Cig measured by the detection module, and the data accuracy is not dependent on the detection accuracy of the gas distribution coefficient, oil temperature, gas-liquid ratio and other parameters, and is not limited by the oil sample variety, which is an ideal oil gas concentration conversion algorithm.

[0156] The specific embodiments of the present application are described above. It should be understood that the present application is not limited to the specific embodiments described above, and various modifications or changes can be made by those skilled in the art within the scope of the claims, which do not affect the essential content of the present application. The above preferred features can be used in combination as long as they do not conflict with each other.

Claims

1. An oil and gas separation device that can achieve complete degassing, characterized by, The utility model relates to an oil-gas separation device control method and device, and relates to the technical field of oil-gas separation device. It comprises: A piston cylinder, one end of which is provided with a piston cylinder top cover, and the other end of which is provided with a motor; A degassing cylinder, which is communicated with one end of the piston cylinder; A degassing electromagnetic valve, which is arranged between the degassing cylinder and the piston cylinder, one end of the degassing electromagnetic valve extends into the interior of the piston cylinder, and the other end of the degassing electromagnetic valve is communicated with the degassing cylinder; A speed-regulating diaphragm pump, which is provided with an air inlet end and an air outlet end, the air inlet end is communicated with the atmosphere, the air outlet end is communicated with the degassing cylinder, and the speed-regulating diaphragm pump is used for cleaning the gas circuit of the oil-gas separation device and providing power for the degassing cylinder; 2. The oil and gas separation device capable of complete degassing according to claim 1, characterized in that, A main control module, which is electrically connected with the piston cylinder, the degassing cylinder, the degassing electromagnetic valve and the speed-regulating diaphragm pump respectively. The piston cylinder comprises: A piston, which is located in the interior of the piston cylinder, and the piston forms an adjustable containing cavity between the interior of the piston cylinder and the piston top cover; A piston connecting rod, one end of which is fixedly connected with the piston, and the other end of which is connected with the motor; Wherein, the piston is sealed with the piston cylinder, and the motor can drive the piston connecting rod, so as to drive the piston to move in the piston cylinder; A lead screw is arranged on the motor, the other end of the piston connecting rod is connected with the lead screw, and a lead screw nut is arranged between the other end of the piston connecting rod and the lead screw; A limiting baffle is arranged on the lead screw nut, and the limiting baffle can move with the piston connecting rod; 3. The oil and gas separation device capable of complete degassing according to claim 1, characterized in that, A limiting switch is arranged on the moving path of the limiting baffle; the limiting switch comprises an upper limiting switch and a lower limiting switch, which are used for limiting the moving distance of the piston connecting rod and controlling the piston connecting rod to move within the upper limiting switch and the lower limiting switch.

4. The oil and gas separation device capable of complete degassing according to claim 3, characterized in that, The speed-regulating diaphragm pump is a direct-current brushless motor speed-regulating diaphragm pump, and the air inlet end of the speed-regulating diaphragm pump is provided with an air filter, which is used for filtering the ambient air.

5. The oil and gas separation device capable of complete degassing according to claim 1, characterized in that, The air filter is selected to be a 0.2 μm water-blocking filter membrane type filter. Further comprising: A vacuum breaking electromagnetic valve, one end of the vacuum breaking electromagnetic valve is provided with a vacuum breaking opening, which is communicated with the external atmosphere, and the other end of the vacuum breaking electromagnetic valve is communicated with the degassing cylinder, which is used for balancing the pressure in the interior of the degassing cylinder; The degassing cylinder comprises a cylinder piston, which can move in the interior of the degassing cylinder, divides the degassing cylinder into an upper cavity and a lower cavity, and the other end of the degassing electromagnetic valve is communicated with the lower cavity; The upper cavity of the degassing cylinder is provided with an interface, and the other end of the vacuum breaking electromagnetic valve is communicated with the interface; 6. A control method of an oil and gas separation device capable of complete degassing according to any one of claims 1 to 5, characterized in that, The degassing cylinder is further provided with a cylinder pressure sensor, the cylinder pressure sensor is communicated with the upper cavity, and the degassing cylinder is an OEM type standard cylinder structure. The control method comprises the following steps: S1, obtaining the state of the oil-gas separation device, judging whether the oil-gas separation device is reset to the initial state, if yes, continuing to execute step S2; S2, controlling the oil-gas separation device to perform gas circuit flushing and vacuumizing; S3, after confirming that the gas circuit is in a vacuum state, controlling the oil-gas separation device to clean the oil circuit and perform oil sample quantification operation; S4, after confirming that the oil sample quantification operation is completed, controlling the oil-gas separation device to perform multiple vacuum degassing treatments on the quantified oil sample; 7. The control method according to claim 6, characterized in that: S5, after confirming that the degassing is completed, controlling the oil-gas separation device to discharge oil. In the step S4, the vacuum degassing treatment of the oil-gas separation device comprises the following steps: S41, confirming that the oil sample quantitative operation is completed, opening the broken empty electromagnetic valve and the degassing electromagnetic valve, making the piston move upward first, passing through the limiting baffle, judging whether the piston reaches the upper limit switch position, if yes, controlling the piston to stop moving, and continuing to execute step S42; S42, closing the degassing electromagnetic valve, controlling the piston to move downward, passing through the limiting baffle, judging whether the piston reaches the lower limit switch position, if yes, controlling the piston to stop moving, and continuing to execute step S43; S43, closing the broken empty electromagnetic valve, opening the degassing electromagnetic valve and the speed regulating diaphragm pump, acquiring the data of the cylinder pressure sensor, controlling the rotating speed and start-stop of the speed regulating diaphragm pump, controlling the pressure in the degassing cylinder to be in the range of 1.3-1.6 times of atmospheric pressure, at the same time, the air power and the negative pressure in the piston cylinder act together, so that the oil sample in the degassing cylinder flows back to the piston cylinder rapidly, and the gas is rapidly separated from the oil sample; S44, judging whether the piston rod in the degassing cylinder returns to the initial position, if yes, closing the degassing electromagnetic valve and the speed regulating diaphragm pump; S45, controlling the oil-gas separation device to wait for a set time, opening the transfer electromagnetic valve, making the piston move upward to the oil quantitative position, closing the transfer electromagnetic valve, completing the degassing operation, and recording the degassing times.

8. The control method according to claim 7, characterized in that: After the step S45, the following steps are further included: S46, acquiring the current degassing times, judging whether the degassing times are greater than or equal to the set degassing times, if yes, acquiring the pressure in the gas collection pipe which is used for collecting the gas after degassing; S47, acquiring the pressure in the gas collection pipe through the gas path pressure sensor, judging whether the pressure in the gas collection pipe changes, if no, acquiring the duration of the pressure not changing; S48, judging whether the duration of the pressure not changing exceeds the preset time according to the duration of the pressure not changing, if yes, determining that the vacuum degassing is completed.

9. A method of calculating the concentration of oil sample in an oil-gas separation device capable of complete degassing according to any one of claims 1 to 5, characterized in that, The method comprises: S100, collecting the gas after degassing by using the gas collection pipe, acquiring the pressure in the gas collection pipe after degassing, the volume of the gas collection pipe, the gas concentration in the gas collection pipe and the oil sample quantitative volume; S200, according to the acquired pressure in the gas collection pipe, the volume of the gas collection pipe, the gas concentration in the gas collection pipe and the oil sample quantitative volume, bringing them into the set oil-gas concentration conversion model, and calculating the concentration of the current oil sample; The set oil-gas concentration conversion model is: CiL0=Cig*Ps / 101.3*Vs / VL; Wherein, CiL0 is the oil sample concentration; Cig is the gas concentration in the gas collection pipe; Ps is the pressure 101.3kpa; Vs is the volume of the gas collection pipe; VL is the oil sample quantitative volume.

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