A heating buffer bias current boosting control system and its control method

Abstract

The present invention provides a heating buffer bias current efficiency improvement control system and its control method, which relates to the technical field of surface engineering. The system includes: the tops of all heating buffer devices are respectively connected to a gas buffer condensation tank for condensing gas through corresponding explosion-proof electric control valves; side-mounted continuous liquid level float detectors for continuously detecting the real-time liquid level inside each heating buffer device are respectively arranged inside each heating buffer device; a bias current control unit is used to detect the real-time pressure inside the heating buffer device, and adjust the real-time pressure inside the heating buffer device and the gas buffer condensation tank through the explosion-proof electric control valve and the gas regulating pump. To solve the problem that when a large number of heating buffer devices operate simultaneously, due to heating, there is a gas top in their sealed interiors, resulting in a serious bias current phenomenon, which is likely to cause safety accidents. Currently, direct discharge is used for pressure relief, which will seriously affect the environment and cause waste of oil and gas resources.

Description

Technical Field

[0001] The present invention relates to the technical field of surface engineering, and particularly relates to a heating buffer flow deviation efficiency improvement control system and a control method thereof. Background Art

[0002] A large number of heating buffer devices are used in oilfield gathering and transportation stations to heat the circulating water of the system to ensure crude oil gathering and transportation and well flushing of oil wells; during the water-bearing period of oilfield development, most of the special heating equipment in oilfields operates without being sealed, the manholes on the upper part of the containers are opened, and the incoming liquid pressure of 0.1 - 0.2 MPa is greater than the local pressure drop of the pipeline of 0.005 MPa. Therefore, the influence of the incoming liquid flow deviation phenomenon on the heating buffer device is not prominent; with the improvement of national environmental protection standards and the upgrading of oilfield production management, the heating buffer device is stipulated to operate in a sealed manner, and a small amount of dissolved gas is released when the settled sewage is heated, gradually forming a "gas cap" at the top of the heating device. When the "gas cap" continuously increases, it directly causes the sewage interface in the container to continuously drop. When the smoke pipes in the heating cabin are exposed, the vaporization of sewage will quickly cause the gas cap pressure to increase and the temperature of the smoke pipes to rise, posing a risk of local mechanical deformation of the smoke pipes and leakage of dirty oil and sewage. On the one hand, it will cause the combustion of the leaked dirty oil during the operation of the heating device burner, resulting in major safety accidents; on the other hand, the viscosity of the produced liquid sewage in the middle and late stages of oilfield development is also continuously increasing, resulting in an increase in the local resistance of the pipeline. These two factors superimpose and amplify the influence of "flow deviation" on the heating buffer device, making it more difficult to manage the safe production of oil and gas gathering and transportation stations.

[0003] In recent years, due to the serious "flow deviation" phenomenon of the incoming liquid in the heating buffer devices of transfer stations in each oilfield, many major safety accidents have occurred, causing significant economic losses; at the same time, "flow deviation" leads to a reduction in the efficiency of the heating system, and in winter, the heating capacity of the circulating sewage is seriously insufficient, making it difficult to ensure normal crude oil gathering and transportation.

[0004] Currently, to solve the influence of the "flow deviation" caused by the gas cap, the accident process in the initial construction of oilfield stations is to directly discharge the gas cap through the accident pipeline, which not only seriously pollutes the environment but also causes waste of oil and gas resources. Summary of the Invention

[0005] The present invention provides a heating buffer flow deviation efficiency improvement control system and a control method thereof to solve the problem that when a large number of heating buffer devices operate simultaneously, a gas cap exists in their sealed interiors due to heating, resulting in a serious flow deviation phenomenon, which is likely to cause safety accidents. The existing method of directly discharging for pressure relief will seriously affect the environment and cause waste of oil and gas resources.

[0006] According to one aspect of the present invention, a heating buffer flow deviation efficiency improvement control system is provided, including: a plurality of heating buffer devices;

[0007] The tops of all the heating buffer devices are respectively connected to a gas buffer condensation tank for condensing the gas through corresponding explosion-proof electric control valves;

[0008] The gas buffer condensation tank is connected to a gas external transmission pump for transporting and regulating the real-time pressure of the gas inside it;

[0009] Inside each of the heating buffer devices, a side-mounted continuous liquid level float detector for continuously detecting the real-time liquid level inside is respectively provided;

[0010] The heating buffer devices, explosion-proof electric control valves, gas buffer condensation tank, gas external transmission pump, and side-mounted continuous liquid level float detector are respectively connected to a bias current control unit. The bias current control unit is used to detect the real-time pressure inside the heating buffer device and adjust the real-time pressure inside the heating buffer device and the gas buffer condensation tank through the explosion-proof electric control valve and the gas external transmission pump.

[0011] Preferably, the side-mounted continuous liquid level float detector includes: a float and an angle sensing mechanism;

[0012] One end of the float is connected to one end of a transmission rod. The side wall of the transmission rod near the other end is axially connected to the angle sensing mechanism, and one end of the transmission rod can rotate clockwise or counterclockwise along the vertical direction of the axial connection position;

[0013] The angle sensing mechanism is connected to the bias current control unit. The angle sensing mechanism is used to detect the real-time rotation angle of the transmission rod and transmit it to the bias current control unit. The bias current control unit is used to determine the real-time liquid level inside the heating buffer device according to the real-time rotation angle.

[0014] Preferably, the angle sensing mechanism includes: an electrical wiring housing, a primary pole magnet, a secondary pole magnet, a rotating shaft, a Hall magnetic induction angle sensor, and an induction magnetic core;

[0015] The end of the transmission rod away from the float is connected to the primary pole magnet;

[0016] The side wall of the secondary pole magnet is connected to the inner side wall of the electrical wiring housing through the rotating shaft, and one end of the secondary pole magnet can rotate clockwise or counterclockwise along the vertical direction of the rotating shaft;

[0017] One end of the rotating shaft is installed with the induction magnetic core and the Hall magnetic induction angle sensor.

[0018] Preferably, it further includes: a spring piece, a moving contact, and a static contact;

[0019] One end of the secondary pole magnet away from the primary pole magnet is connected to one end of the spring piece, and the other end of the spring piece is connected to the moving contact;

[0020] The static contact is fixed on the inner side wall of the electrical wiring housing, positioned below the moving contact. When the moving contact contacts the static contact, the real-time liquid level in the heating buffer device is at a predetermined highest position.

[0021] Preferably, the bias current control unit includes: a primary pressure transmitter, a secondary pressure transmitter, a tertiary pressure transmitter, and a liquid level switch;

[0022] The primary pressure transmitter is installed on the liquid inlet manifold connected to the heating buffer device for detecting the real-time liquid inlet pressure in the liquid inlet manifold;

[0023] The secondary pressure transmitter is connected to the heating buffer device for detecting the real-time pressure of the gas in the heating buffer device;

[0024] The tertiary pressure transmitter is connected to the gas buffer condensation tank for detecting the real-time pressure of the gas in the gas buffer condensation tank;

[0025] The liquid level switch is fixed inside the gas buffer condensation tank for detecting whether the real-time liquid level in the gas buffer condensation tank is less than a first predetermined liquid level.

[0026] Preferably, it further includes: a pump reflux solenoid valve;

[0027] The inlet of the pump reflux solenoid valve is connected to the outlet pipeline of the gas export pump, and the outlet of the pump reflux solenoid valve is connected to the inlet pipeline of the gas export pump.

[0028] According to one aspect of the present invention, there is provided a control method for a heating buffer bias current efficiency improvement control system, including:

[0029] Respectively determine the top pressure in each heating buffer device under the same liquid inlet volume;

[0030] The bias current control unit detects the real-time pressure in the heating buffer device and determines whether the real-time pressure in the heating buffer device is equal to its corresponding top pressure. If not, the bias current control unit adjusts the opening degree of the explosion-proof electric control valve to make the real-time pressure equal to the top pressure;

[0031] When the bias current control unit detects and determines through a side-mounted continuous liquid level float detector that the real-time liquid level in the heating buffer device is less than a second predetermined liquid level, it adjusts the opening degree of the explosion-proof electric control valve to make the real-time liquid level equal to the second predetermined liquid level;

[0032] When the bypass flow control unit detects and determines that the real-time pressure in the gas buffer condensation tank is greater than the real-time pressure in the heating buffer device, the bypass flow control unit controls the gas export pump to start so that the real-time pressure in the gas buffer condensation tank is less than the real-time pressure in the heating buffer device.

[0033] Preferably, the method for respectively determining the top pressure in each heating buffer device under the same liquid inlet volume includes:

[0034] Respectively determine the pressure loss of each fluid entering the heating buffer device in the pipeline;

[0035] According to the pressure loss, determine the top pressure in each heating buffer device when the relational expression (1) is satisfied;

[0036] Ht1 + P1 = Ht2 + P2 =... = Ht N + P N (1);

[0037] In the formula, Ht i is the pressure loss corresponding to the i-th heating buffer device, P i is the top pressure corresponding to the i-th heating buffer device, N is the number of heating buffer devices, where i = 1, 2, 3... N.

[0038] Preferably, the method for respectively determining the pressure loss of each fluid entering the heating buffer device in the pipeline includes:

[0039] Use formula (2) to determine the pressure loss of the fluid in the heating buffer device in the pipeline;

[0040] (2);

[0041] Among them,

[0042] ;

[0043] Among them, ;

[0044] In the formula, Ht is the pressure loss, m water column, V is the flow velocity, m / s, is the friction factor, L is the total length of the incoming liquid collecting pipe and the liquid inlet pipeline of the heating buffer device, m, d is the pipeline diameter, m, is the local resistance coefficient, g is the acceleration of gravity, Re is the Reynolds number, is the kinematic viscosity of water, m 2 / s, e is the roughness of the pipeline.

[0045] The present invention has at least the following beneficial effects:

[0046] The present invention provides a heating buffer biasing current boosting efficiency control system and its control method. By interlocking the biasing current control unit with the side-mounted continuous liquid level float detector, the sewage liquid level in the heating buffer device is detected and adjusted in a timely manner, ensuring uniform liquid inlet of each heating buffer device at the station yard, and solving the serious impact of "biasing current" on the heating buffer device. By adding a gas export pump and an explosion-proof electric control valve, and overall continuous control of the system, not only the airtight recovery of gas and pollution elimination are realized, but also it is a guarantee for the stable operation of the biasing current boosting efficiency control system of the heating device. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The accompanying drawings herein are incorporated into the specification and form a part of this specification. These drawings show embodiments consistent with the present invention and, together with the specification, are used to explain the technical solutions of the present invention.

[0048] Figure 1 FIG. shows a schematic structural diagram of a heating buffer biasing current boosting efficiency control system according to an embodiment of the present invention;

[0049] Figure 2 FIG. shows a front view of a side-mounted continuous liquid level float detector according to an embodiment of the present invention;

[0050] Figure 3 FIG. shows a top view of a side-mounted continuous liquid level float detector according to an embodiment of the present invention.

[0051] In the figures, 1 - heating buffer device, 2 - controller, 4 - gas buffer condensation tank, 11 - liquid inlet pipeline, 12 - liquid outlet pipeline, 16 - liquid inlet manifold, 17 - liquid outlet manifold, 21 - primary pressure transmitter, 22 - side-mounted continuous liquid level float detector, 23 - secondary pressure transmitter, 24 - explosion-proof electric control valve, 31 - tertiary pressure transmitter, 32 - liquid level switch, 33 - condensate discharge solenoid valve, 34 - pump return solenoid valve, 42 - condensate discharge pipeline, 44 - gas export pump, 45 - check valve, 71 - float, 72 - primary magnetic pole magnet, 73 - secondary magnetic pole magnet, 74 - rotating shaft, 75 - Hall magnetic induction angle sensor, 76 - induction magnetic core, 77 - static contact, 78 - moving contact, 79 - spring piece, 80 - transmission rod, 81 - electrical wiring housing. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0052] The following will detail various exemplary embodiments, features, and aspects of the present invention with reference to the accompanying drawings. The same reference numerals in the drawings denote elements having the same or similar functions. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0053] As used herein, the term "exemplary" means "serving as an example, embodiment, or illustration". Any embodiment described as "exemplary" herein need not be construed as superior or better than other embodiments.

[0054] As used herein, the term "and / or" is merely a description of the relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the term "at least one" as used herein means any one of a plurality or any combination of at least two of a plurality. For example, including at least one of A, B, and C can represent including any one or more elements selected from the set composed of A, B, and C.

[0055] In addition, to better illustrate the present invention, numerous specific details are given in the following detailed implementation manners. Those skilled in the art should understand that the present invention can also be implemented without certain specific details. In some instances, methods, means, elements, and circuits well-known to those skilled in the art are not described in detail to highlight the gist of the present invention.

[0056] Figure 1 A schematic structural diagram of a heating buffer bias current boosting control system according to an embodiment of the present invention is shown; Figure 2 A front view of a side-mounted continuous liquid level float detector according to an embodiment of the present invention is shown; Figure 3 A top view of a side-mounted continuous liquid level float detector according to an embodiment of the present invention is shown. As Figures 1-3 shown, a heating buffer bias current boosting control system includes: a plurality of heating buffer devices 1; the tops of all the heating buffer devices 1 are respectively connected to a gas buffer condensation tank 4 for condensing gas through corresponding explosion-proof electric control valves 24; the gas buffer condensation tank 4 is connected to a gas external transmission pump 44 for transporting and regulating the real-time pressure inside it; a side-mounted continuous liquid level float detector 22 for continuously detecting the real-time liquid level inside is respectively arranged inside each heating buffer device 1; the heating buffer device 1, the explosion-proof electric control valve 24, the gas buffer condensation tank 4, the gas external transmission pump 44, and the side-mounted continuous liquid level float detector 22 are respectively connected to a bias current control unit, and the bias current control unit is used to detect the real-time pressure inside the heating buffer device 1 and regulate the real-time pressure inside the heating buffer device 1 and the gas buffer condensation tank 4 through the explosion-proof electric control valve 24 and the gas external transmission pump.

[0057] In an embodiment of the present invention, if there are two heating buffer devices 1 in the system, the two heating buffer devices 1 are respectively connected to the inlet liquid manifold 16 through the corresponding inlet liquid pipelines 11, respectively connected to the outlet liquid manifold 17 through the corresponding outlet liquid pipelines 12, and respectively connected to the gas buffer condensation tank 4 through the corresponding explosion-proof electric control valve 24 and the condensation tank gas inlet pipeline.

[0058] After the heating buffer device 1 is started, the liquid inside it is heated. The gas pressures generated after heating are different. At the same time, due to the different positions of the two heating buffer devices 1 and the different lengths of the inlet liquid pipelines 11, the liquid flow rates and velocities entering their interiors are also different. In order to prevent the occurrence of uneven flow in the two heating buffer devices 1 during operation, it is necessary to ensure that the real-time liquid inlet amounts inside the two devices are the same.

[0059] The liquid inlet amount is affected by the pressure loss of the liquid in the pipeline and the back pressure inside the heating buffer device 1. When the sum of the back pressure inside each heating buffer device 1 and the pressure loss of the corresponding liquid entering its interior is equal, the liquid inlet amounts inside each heating buffer device 1 are the same at this time. Therefore, according to the corresponding pressure losses of each heating buffer device 1, the back pressure that needs to be maintained inside each heating buffer device 1, that is, the predetermined back pressure, can be determined.

[0060] After the uneven flow control unit is started, it continuously detects the real-time pressure inside each heating buffer device 1 and constantly judges whether the real-time pressure inside the heating buffer device 1 is equal to the predetermined back pressure. If not, it means that the liquid inlet amounts inside each heating buffer device 1 are not the same. Then the uneven flow control unit controls the explosion-proof electric control valve 24 to open and adjusts its opening degree so that the real-time pressure inside each heating buffer device 1 is maintained the same as the corresponding predetermined back pressure. When there is instrument air source at the station yard, the explosion-proof electric control valve 24 can also be replaced by an explosion-proof pneumatic control valve.

[0061] After the gas inside the heating buffer device 1 enters the gas buffer condensation tank 4 through the explosion-proof electric control valve 24 and the condensation tank gas inlet pipeline, the gas buffer condensation tank 4 is started to cool the gas. Condensate is generated after the gas is cooled; the uneven flow control unit detects the real-time liquid level inside the gas buffer condensation tank 4. When it judges that the real-time liquid level reaches the first predetermined liquid level, it controls the condensate discharge solenoid valve 33 connected to the condensate discharge pipeline 42 at the bottom of the gas buffer condensation tank 4 to open, and the internal condensate flows to the station's dirty oil buffer tank to realize the system recovery of light oil. After the condensate discharge is completed, it controls the condensate discharge solenoid valve 33 to close.

[0062] The real-time pressure of the gas in the gas buffer condensation tank 4 needs to be less than the real-time pressure in the heating buffer device 1 to prevent the real-time pressure in the heating buffer device 1 from being too high to be discharged into the gas buffer condensation tank 4, causing a phenomenon of uneven flow. The uneven flow control unit detects the real-time pressure in the gas buffer condensation tank 4 in real time and determines whether it is less than the real-time pressure in the heating buffer device 1. If so, it controls the gas export pump 44 to start and the check valve 45 at the outlet of the gas export pump 44 to open. The gas export pump 44 pumps out the gas in the gas buffer condensation tank 4, boosts the pressure and transports it to the natural gas drying system in the station to achieve the full recovery of the gas. When the real-time pressure in the gas buffer condensation tank 4 drops to be less than the real-time pressure in the heating buffer device 1, the gas export pump 44 and the check valve 45 are controlled to close.

[0063] The uneven flow control unit detects the real-time liquid level in the heating buffer device 1 in real time through the side-mounted continuous liquid level float detector 22 and determines whether the real-time liquid level is equal to the second predetermined liquid level. If not, it controls the explosion-proof electric control valve 24 to open, so that the real-time pressure in the heating buffer device 1 decreases, thereby increasing the real-time liquid level, or controls the opening degree of the valve at the inlet or outlet to adjust the liquid inflow or outflow to adjust the real-time liquid level. The liquid level in the heating buffer device 1 needs to be kept stable. Too high or too low will affect the operation stability of the system. The uneven flow control unit can adjust the real-time liquid level through the side-mounted continuous liquid level float detector 22.

[0064] At the same time, in addition to adjusting the liquid inflow of the heating buffer device 1 through the top pressure to prevent uneven flow, the uneven flow control unit can also detect and judge whether the real-time liquid levels in each heating buffer device 1 are the same or equal to the second predetermined liquid level through the side-mounted continuous liquid level float detector 22, so as to determine whether there is an uneven flow phenomenon and prevent the uneven flow phenomenon from not being detected in time due to inaccurate pressure detection.

[0065] In the present invention, the side-mounted continuous liquid level float detector 22 includes: a float 71 and an angle sensing mechanism; the float 71 is connected to one end of a transmission rod 80, the side wall of the transmission rod 80 near the other end is axially connected to the angle sensing mechanism, and one end of the transmission rod 80 can rotate clockwise or counterclockwise along the vertical direction of the axial connection position; the angle sensing mechanism is connected to the uneven flow control unit, the angle sensing mechanism is used to detect the real-time rotation angle of the transmission rod 80 and transmit it to the uneven flow control unit, and the uneven flow control unit is used to determine the real-time liquid level in the heating buffer device 1 according to the real-time rotation angle.

[0066] In an embodiment of the present invention, when detecting the liquid level, the floating ball 71 floats on the liquid surface of the liquid in the heating buffer device 1. When the liquid level rises or falls, the floating ball 71 floats along with the liquid level, thereby driving one end of the transmission rod 80 to rotate clockwise or counterclockwise with the connection part with the angle sensing mechanism as the axis. The angle sensing mechanism detects the rotation angle of the transmission rod 80 in real time and transmits it to the bias current control unit. The bias current control unit determines the real-time liquid level of the liquid in the heating buffer device 1 according to the rotation angle. For example, according to the position of the floating ball 71 at the lowest point, that is, when the floating ball 71 moves to the lowest point, one end of the transmission rod 80 rotates downward counterclockwise to the liquid level position corresponding to the minimum angle, and when the floating ball 71 moves to the highest point, one end of the transmission rod 80 rotates upward clockwise to the liquid level position corresponding to the maximum angle, the real-time liquid level in the heating buffer device 1 corresponding to a certain angle between the maximum angle and the minimum angle when the transmission rod 80 rotates can be calculated.

[0067] In the present invention, the angle sensing mechanism includes: an electrical wiring housing 81, a primary pole magnet 72, a secondary pole magnet 73, a rotating shaft 74, a Hall magnetic induction angle sensor 75, and an induction magnetic core 76; one end of the transmission rod 80 away from the floating ball 71 is connected to the primary pole magnet 72; the side wall of the secondary pole magnet 73 is connected to the inner side wall of the electrical wiring housing 81 through the rotating shaft 74, and one end of the secondary pole magnet 73 can rotate clockwise or counterclockwise along the vertical direction of the rotating shaft 74; one end of the rotating shaft 74 is provided with the induction magnetic core 76 and the Hall magnetic induction angle sensor 75.

[0068] In an embodiment of the present invention, one end of the transmission rod 80 away from the floating ball 71 is inside the electrical wiring housing 81, and the side wall of one end of the transmission rod 80 away from the floating ball 71 is axially connected to the inner side wall of the electrical wiring housing 81. One end of the primary pole magnet 72 is connected to the transmission rod 80; the connection position of the secondary pole magnet 73 with the inner side wall of the electrical wiring housing 81 is close to one end of the secondary pole magnet 73; the other end of the primary pole magnet 72 is opposite to the other end of the secondary pole magnet 73, and the magnetic poles of the opposite ends of the two pole magnets are opposite, and the Hall magnetic induction angle sensor 75 is installed close to the induction magnetic core 76.

[0069] When the floating ball 71 rotates upward or downward, it drives the other end of the transmission rod 80 to rotate upward or downward, thereby driving the other end of the primary magnetic pole magnet 72 to rotate upward or downward; since the other end of the primary magnetic pole magnet 72 is opposite to and has an opposite magnetic pole with the other end of the secondary magnetic pole magnet 73, the other end of the secondary magnetic pole magnet 73 is driven to rotate upward or downward by magnetic suction. When the secondary magnetic pole magnet 73 rotates upward or downward, it drives the induction magnetic core 76 to rotate. The Hall magnetic induction angle sensor 75 detects the angle change value when the induction magnetic core 76 rotates, and outputs a continuous rotation angle signal and transmits it to the bias current control unit. The bias current control unit can determine the rotation angle of the transmission rod 80 according to this rotation angle signal, thereby determining the floating distance of the floating ball 71, that is, the real-time liquid level in the current heating buffer device 1, so as to measure the continuous liquid level change.

[0070] In the present invention, it further includes: a spring piece 79, a moving contact 78, and a static contact 77; one end of the secondary magnetic pole magnet 73 away from the primary magnetic pole magnet 72 is connected to one end of the spring piece 79, and the other end of the spring piece 79 is connected to the moving contact 78; the static contact 77 is fixed on the inner side wall of the electrical wiring housing 81 and is located below the moving contact 78. When the moving contact 78 contacts the static contact 77, the real-time liquid level in the heating buffer device 1 is at a predetermined highest position.

[0071] In an embodiment of the present invention, the moving contact 78 is connected to the bias current control unit. When the floating ball 71 moves downward to the lowest position, one end of the secondary magnetic pole magnet 73 is at the highest position. At this time, the moving contact 78 at the other end of the spring piece 79 is also at the highest position, indicating that the liquid level inside the heating buffer device 1 is the lowest; when the floating ball 71 moves upward to the highest position as the liquid level rises, one end of the secondary magnetic pole magnet 73 is at the lowest position. At this time, the moving contact 78 at the other end of the spring piece 79 contacts the static contact 77 below. When the moving contact 78 contacts the static contact 77, a signal will be sent to the bias current control unit. The bias current control unit determines that the liquid level in the heating buffer device 1 has reached the highest level according to the signal sent by the moving contact 78. In order to prevent the liquid in the heating buffer device 1 from overflowing upward from the pipeline or the pressure from being too high due to the continuous rise of the liquid level, the bias current control unit can control the valve of the corresponding liquid inlet pipeline 11 to close, or control the corresponding explosion-proof electric control valve 24 to close, so that the liquid level no longer rises.

[0072] Setting the moving contact 78 and the static contact 77 can prevent the problem that when only the floating ball 71 and the Hall magnetic induction angle sensor 75 are used to detect the liquid level height to judge whether the liquid level has reached the highest point, due to abnormal detection or calculation of the sensor, the liquid level has reached the highest level but not been detected in time, resulting in too much liquid in the heating buffer device 1.

[0073] In the present invention, the bias current control unit includes: a primary pressure transmitter 21, a secondary pressure transmitter 23, a tertiary pressure transmitter 31, and a liquid level switch 32; the primary pressure transmitter 21 is installed on the liquid inlet manifold 16 connected to the heating buffer device 1 for detecting the real-time liquid inlet pressure in the liquid inlet manifold 16; the secondary pressure transmitter 23 is connected to the heating buffer device 1 for detecting the real-time pressure of the gas in the heating buffer device 1; the tertiary pressure transmitter 31 is connected to the gas buffer condensation tank 4 for detecting the real-time pressure of the gas in the gas buffer condensation tank 4; the liquid level switch 32 is fixed inside the gas buffer condensation tank 4 for detecting whether the liquid level in the gas buffer condensation tank 4 is less than a first predetermined liquid level.

[0074] In an embodiment of the present invention, the bias current control unit further includes: a controller 2, and the controller 2 is respectively connected to the primary pressure transmitter 21, the secondary pressure transmitter 23, the tertiary pressure transmitter 31, the liquid level switch 32, a Hall magnetic induction angle sensor 75, a moving contact 78, a gas export pump 44, an explosion-proof electric control valve 24, a condensate discharge solenoid valve 33, and a check valve 45.

[0075] The controller 2 controls the secondary pressure transmitter 23 to start, detects the real-time pressure inside the corresponding connected heat buffer device, and continuously determines whether the real-time pressure in the heating buffer device 1 is equal to a predetermined top pressure. If not, it controls the explosion-proof electric control valve 24 corresponding to the heating buffer device 1 to open the opening degree to adjust the real-time pressure in the heating buffer device 1 to be equal to the predetermined top pressure.

[0076] The controller 2 controls the tertiary pressure transmitter 31 to start detecting the real-time pressure in the gas buffer condensation tank 4, and determines whether the real-time pressure in the gas buffer condensation tank 4 is less than the real-time pressure in the heating buffer device 1. If not, the controller 2 controls the gas export pump 44 to start, extracts the gas in the gas buffer condensation tank 4 and transports it to the natural gas system. When the real-time pressure in the gas buffer condensation tank 4 is less than the real-time pressure in the heating buffer device 1, it controls the gas export pump 44 to close.

[0077] The controller 2 controls the liquid level switch 32 to start, detects the liquid level in the gas buffer condensation tank 4, and determines whether the real-time liquid level in the gas buffer condensation tank 4 is less than the first predetermined liquid level. If not, it controls the condensate discharge solenoid valve 33 to open and discharges the liquid in the gas buffer condensation tank 4 to the dirty oil buffer tank.

[0078] In the present invention, it further includes: a pump return solenoid valve 34; the inlet of the pump return solenoid valve 34 is connected to the outlet pipeline of the gas export pump 44, and the outlet of the pump return solenoid valve 34 is connected to the inlet pipeline of the gas export pump 44.

[0079] In the embodiment of the present invention, the function of the pump return solenoid valve 34 is to appropriately open the pump return solenoid valve 34 when the gas volume discharged is insufficient during the pressure regulation process of multiple heating buffer devices 1, so as to ensure that the gas export pump 44 does not start and stop frequently, and enables the gas export pump 44 to operate in a low-power state, ensuring the stability of the gas pressure in the gas buffer condensation tank 4 and also ensuring the stable control of the gas pressure inside the entire heating buffer device 1.

[0080] The present invention also provides a control method for a heating buffer flow deviation and efficiency improvement control system, including: respectively determining the top pressure of each heating buffer device 1 under the same liquid inlet volume; the flow deviation control unit detects the real-time pressure in the heating buffer device 1 and determines whether the real-time pressure in the heating buffer device 1 is equal to the corresponding top pressure. If not, the flow deviation control unit adjusts the opening of the explosion-proof electric control valve 24 to make the real-time pressure equal to the top pressure; when the flow deviation control unit detects and determines through the side-mounted continuous liquid level float detector 22 that the real-time liquid level in the heating buffer device 1 is less than the predetermined liquid level, the opening of the explosion-proof electric control valve 24 is adjusted to make the real-time liquid level equal to the second predetermined liquid level; when the flow deviation control unit detects and determines that the real-time pressure in the gas buffer condensation tank 4 is greater than the real-time pressure in the heating buffer device 1, the flow deviation control unit controls the gas export pump 44 to start so that the real-time pressure in the gas buffer condensation tank 4 is less than the real-time pressure in the heating buffer device 1.

[0081] In the present invention, the method for respectively determining the top pressure of each heating buffer device 1 under the same liquid inlet volume includes: respectively determining the pressure loss of the fluid entering each heating buffer device in the pipeline; according to the pressure loss, determining the top pressure of each heating buffer device that satisfies the relational expression (1);

[0082] Ht1 + P1 = Ht2 + P2 =... = Ht N + P N (1);

[0083] In the formula, Ht i is the pressure loss corresponding to the i-th heating buffer device, P i is the top pressure corresponding to the i-th heating buffer device, N is the number of heating buffer devices, where i = 1, 2, 3... N.

[0084] In the present invention, the method for respectively determining the pressure loss of the fluid entering each heating buffer device in the pipeline includes: using formula (2) to determine the pressure loss of the fluid in the heating buffer device in the pipeline;

[0085] (2);

[0086] Wherein,

[0087] ;

[0088] Among them, ;

[0089] In the formula, Ht is the pressure loss, m of water column, V is the flow velocity, m / s, is the friction resistance coefficient, L is the total length of the liquid inlet pipe and the liquid inlet pipeline of the heating buffer device, m, d is the pipe diameter, m, is the local resistance coefficient, g is the acceleration of gravity, Re is the Reynolds number, is the kinematic viscosity of water, m 2 / s, e is the roughness of the pipe.

[0090] In the embodiment of the present invention, according to the fluid mechanics formula, it can be known that the pressure loss of the medium in the pipeline is proportional to the square of the fluid flow velocity and the local resistance coefficient and the friction resistance coefficient of the fluid flowing in the pipeline, that is, formula (2).

[0091] Assume that the local resistance coefficients of the heating buffer device 1 are all the same (that is, the elbows in the liquid inlet pipeline, the side outlet mode of the T-shaped pipe of the liquid inlet manifold into the heating buffer device 1, the fully open liquid inlet regulating gate valve, etc. are all the same), and the friction resistance coefficient and the pressure loss of the inlet fluid of each heating buffer device 1 are related to the spacing length L between the heating buffer devices 1. The spacing between the liquid inlet manifold 16 through the 1# heating buffer device to the N# heating buffer device is different, and its pressure loss is also different. In order to maintain the same pressure loss, the fluid automatically distributes different flow velocities to each heating buffer device 1. The flow velocities are different, and the inlet flow rates are different, and the inlet flow velocity of the last heating buffer device 1 is the smallest.

[0092] In addition, due to the different pressures of the gas at the top of each heating buffer device 1, it will be superimposed on the pressure loss of the inlet liquid of the entire heating buffer device 1. Due to the different inlet liquid volumes, the generated volatile gas volumes are different, resulting in differences in the gas pressure at the top, causing the inlet flow rate to be more unbalanced, forming a negative feedback effect, and thus forming a greater deviation flow.

[0093] Assume that the gas top pressure of the 1# heating buffer device is P1, the pressure loss is Ht1, the pipeline length is L1, and the friction resistance coefficient 1; the flow velocity is V1;

[0094] Assume that the gas top pressure of the 2# heating buffer device is P2, the pressure loss is Ht2, the pipeline length is L2, and the friction resistance coefficient 2; the flow velocity is V2…;

[0095] Assume that the gas top pressure of the N# heating buffer device is P N , the pressure loss is Ht N, pipeline length L N , friction factor along the way N ; flow velocity V N ;

[0096] Then ; ; ;

[0097] In order to ensure that the liquid inlet volume of each heating buffer device remains consistent, it is necessary to ensure that Ht1 + P1 = Ht2 + P2 = Ht N + P N ;

[0098] Through the secondary pressure transmitter 23, the gas top pressures (real-time pressures) of each heating buffer device 1 can be measured as P1, P2,... P N , from which the liquid inlet flow velocities of each heating buffer device 1 can be calculated, and then the liquid inlet volume can be calculated. By adjusting the gas top pressures P1, P2,... P of each heating buffer device 1 N , the purpose of consistent liquid inlet volume can be achieved, thereby preventing the occurrence of uneven flow.

[0099] After the uneven flow control unit determines the predetermined top pressure corresponding to each heating buffer device 1 through the above formulas (1) and (2), it compares the detected real-time pressure with the predetermined top pressure through the secondary pressure transmitter 23, and keeps the real-time pressure in each heating buffer device 1 equal to the predetermined top pressure by adjusting the opening degree of the corresponding explosion-proof electric control valve 24, so as to achieve the purpose of keeping the liquid inlet volume of each heating buffer device 1 consistent.

[0100] The uneven flow control unit can judge the trend of the incoming liquid volume according to the real-time liquid level detected by the side-mounted continuous liquid level float detector 22 of each heating buffer device 1, which is used to correct the error of calculating the liquid inlet flow through formulas (1) and (2), and at the same time ensure that the uneven flow control unit can control the liquid level height of the heating section of each heating buffer device 1 to fluctuate within the required range.

[0101] It can be understood that for the above-mentioned various method embodiments mentioned in the present invention, without violating the principle logic, they can be combined with each other to form a combined embodiment. Due to space limitations, the present invention will not elaborate further.

[0102] Those skilled in the art can understand that in the above method of the specific implementation manner, the writing order of each step does not mean a strict execution order and does not constitute any limitation to the implementation process. The specific execution order of each step should be determined according to its function and possible internal logic.

[0103] The present invention has the following advantages: 1. Without changing the original mechanical equipment of the heating buffer device, the liquid level and pressure detection methods are updated. Through "gas top" pressure regulation, the serious problem of uneven incoming water of the recycled sewage in the oilfield gathering and transportation station is efficiently solved, eliminating potential safety hazards and improving the heating efficiency of the system, meeting the technical requirements of oilfield safety production; 2. The uneven flow control unit is adopted to overall monitor and adjust the liquid level and pressure of each heating device, ensuring the safe and stable operation of multiple operating heating buffer devices; 3. The original interfaces of the existing containers are utilized to improve the process, without the need to transform the pressure vessels, ensuring the feasibility; 4. The uneven flow control unit is independently developed. Through programmed design, on the premise of realizing the function of stable liquid level of the heating buffer device, by comparing the liquid level and pressure, the faulty device is accurately determined and alarm and interlock safeguard measures are implemented. While ensuring the safety and stability of the system, the device fault points are timely detected, greatly reducing the labor intensity of the operating staff; 5. For large-scale stations or small independent stations, this type of system has good adaptability, and has the advantages of reliable technology and strong economy compared with the conventional treatment of potential safety hazards; 6. Through the implementation of the heating buffer uneven flow efficiency improvement control device, multiple heating buffer devices in the station and depot no longer operate in an open mode due to uneven flow, preventing the leakage of volatile organic compounds, providing technical guarantee for improving the air quality in the oilfield production area.

[0104] The present invention solves the serious impact of "uneven flow" on the heating buffer device by setting up the side-mounted continuous liquid level float detector, pressure transmitter, and explosion-proof electric control valve to operate in series, and by measuring and adjusting the sewage liquid level in real time to ensure uniform liquid inlet of each heating buffer device in the station. And by adding a gas buffer and condenser tank for gas pressure stabilization, the overall continuous control of the system is realized, not only realizing the airtight recovery of gas and eliminating pollution, but also guaranteeing the stable operation of the system. It solves the major potential safety hazard problem caused by the "uneven flow" of the liquid supply of the heating buffer device in the existing oilfield transfer stations, gathering and transportation stations, and water discharge stations. By adopting the control method of balancing the gas top pressure of different heating buffer devices, the uneven flow phenomenon of the heating buffer device is eliminated, and the potential safety hazard caused by dry burning of the heating buffer device due to uneven flow is avoided, achieving the purpose of safe production. The present invention also has the advantages of simple equipment installation, wide adaptability, simple process control, small construction volume, safe and reliable operation, low cost, and good process adaptability.

[0105] The embodiments of the present invention have been described above. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other ordinary skilled persons in the technical field to understand the disclosed embodiments.

Claims

1. A heating buffer bias current efficiency improvement control system, characterized in that Comprising: A plurality of heating buffer devices (1); The tops of all the heating buffer devices (1) are respectively connected to a gas buffer condensation tank (4) for condensing gas through corresponding explosion-proof electric control valves (24); The gas buffer condensation tank (4) is connected to a gas external transmission pump (44) for transporting and regulating the real-time pressure inside it; Inside each heating buffer device (1), a side-mounted continuous liquid level float detector (22) for continuously detecting the real-time liquid level inside it is respectively arranged; The heating buffer device (1), the explosion-proof electric control valve (24), the gas buffer condensation tank (4), the gas external transmission pump (44), and the side-mounted continuous liquid level float detector (22) are respectively connected to a bias current control unit, and the bias current control unit is used to detect the real-time pressure inside the heating buffer device (1), and regulate the real-time pressure inside the heating buffer device (1) and the gas buffer condensation tank (4) through the explosion-proof electric control valve (24) and the gas external transmission pump; Respectively determine the top pressure of each heating buffer device (1) under the same liquid inflow; The bias current control unit detects the real-time pressure inside the heating buffer device (1), and judges whether the real-time pressure inside the heating buffer device (1) is equal to its corresponding top pressure. If not, the bias current control unit adjusts the opening degree of the explosion-proof electric control valve (24) to make the real-time pressure equal to the top pressure; When the bias current control unit detects and judges through the side-mounted continuous liquid level float detector (22) that the real-time liquid level inside the heating buffer device (1) is less than the second predetermined liquid level, it adjusts the opening degree of the explosion-proof electric control valve (24) to make the real-time liquid level equal to the second predetermined liquid level; When the bias current control unit detects and judges that the real-time pressure inside the gas buffer condensation tank (4) is greater than the real-time pressure inside the heating buffer device (1), the bias current control unit controls the gas external transmission pump (44) to start so that the real-time pressure inside the gas buffer condensation tank (4) is less than the real-time pressure inside the heating buffer device (1).

2. The heating buffer bias current boosting control system according to claim 1, wherein The side-mounted continuous liquid level float detector (22) includes: a float (71) and an angle sensing mechanism; The float (71) is connected to one end of a transmission rod (80), the side wall of the transmission rod (80) near the other end is axially connected to the angle sensing mechanism, and one end of the transmission rod (80) can rotate clockwise or counterclockwise along the vertical direction of the axial connection position; The angle sensing mechanism is connected to the bias current control unit, the angle sensing mechanism is used to detect the real-time rotation angle of the transmission rod (80) and transmit it to the bias current control unit, and the bias current control unit is used to determine the real-time liquid level inside the heating buffer device (1) according to the real-time rotation angle.

3. The heating buffer bias current boosting control system according to claim 2, characterized in that The angle sensing mechanism includes: an electrical wiring housing (81), a primary pole magnet (72), a secondary pole magnet (73), a rotating shaft (74), a Hall magnetic induction angle sensor (75), and an induction magnetic core (76); One end of the transmission rod (80) away from the float (71) is connected to the primary pole magnet (72); The side wall of the secondary pole magnet (73) is connected to the inner side wall of the electrical wiring housing (81) through the rotating shaft (74), and one end of the secondary pole magnet (73) can rotate clockwise or counterclockwise along the vertical direction of the rotating shaft (74); One end of the rotating shaft (74) is installed with the induction magnetic core (76) and the Hall magnetic induction angle sensor (75).

4. The heating buffer bias current boosting control system according to claim 3, wherein It further includes: A spring piece (79), a moving contact (78), and a static contact (77); One end of the secondary pole magnet (73) far from the primary pole magnet (72) is connected to one end of the spring piece (79), and the other end of the spring piece (79) is connected to the moving contact (78); The static contact (77) is fixed on the inner side wall of the electrical wiring housing (81), and is located below the moving contact (78). When the moving contact (78) contacts the static contact (77), the real-time liquid level in the heating buffer device (1) is at the predetermined highest position.

5. The heating buffer bias current boosting control system according to claim 1, wherein The bias current control unit includes: a primary pressure transmitter (21), a secondary pressure transmitter (23), a tertiary pressure transmitter (31), and a liquid level switch (32); The primary pressure transmitter (21) is installed on the liquid inlet manifold (16) connected to the heating buffer device (1) for detecting the real-time liquid inlet pressure in the liquid inlet manifold (16); The secondary pressure transmitter (23) is connected to the heating buffer device (1) for detecting the real-time pressure of the gas in the heating buffer device (1); The tertiary pressure transmitter (31) is connected to the gas buffer condensation tank (4) for detecting the real-time pressure of the gas in the gas buffer condensation tank (4); The liquid level switch (32) is fixed inside the gas buffer condensation tank (4) for detecting whether the real-time liquid level in the gas buffer condensation tank (4) is less than the first predetermined liquid level.

6. The heating buffer bias current boosting control system according to any one of claims 1-5, characterized in that, It further includes: A pump reflux solenoid valve (34); The inlet of the pump reflux solenoid valve (34) is connected to the outlet pipeline of the gas export pump (44), and the outlet of the pump reflux solenoid valve (34) is connected to the inlet pipeline of the gas export pump (44).

7. The heating buffer bias current boosting control system according to claim 1, characterized in that The method for respectively determining the top pressure in each heating buffer device (1) under the condition of the same liquid inlet volume includes: Respectively determining the pressure loss of the fluid in the pipeline entering each heating buffer device (1); According to the pressure loss, determining the top pressure in each heating buffer device (1) when the relational expression (1) is satisfied; Ht1 + P1 = Ht2 + P2 =... = Ht N + P N (1); Wherein, Ht i is the pressure loss corresponding to the i-th heating buffer device (1), P i is the top pressure corresponding to the i-th heating buffer device (1), and N is the number of heating buffer devices (1), where i = 1, 2, 3... N.

8. The heating buffer bias current boosting control system according to claim 7, wherein The method for respectively determining the pressure loss of the fluid in the pipeline entering each heating buffer device (1) includes: Using formula (2) to determine the pressure loss of the fluid in the pipeline of the heating buffer device (1); （2）； Wherein, ； Among them, ; Wherein, Ht is the pressure loss, in m of water column, V is the flow velocity, in m / s, is the friction coefficient along the path, L is the total length of the liquid inlet pipe and the liquid inlet pipeline of the heating buffer device, in m, d is the pipe diameter, in m, is the local resistance coefficient, g is the acceleration due to gravity, Re is the Reynolds number, is the kinematic viscosity of water, in m 2 / s, and e is the roughness of the pipe.

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