CN109323128B - Oil pipeline variable frequency pump and regulating valve combined pressure regulating method - Google Patents
Oil pipeline variable frequency pump and regulating valve combined pressure regulating method Download PDFInfo
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- CN109323128B CN109323128B CN201811303104.4A CN201811303104A CN109323128B CN 109323128 B CN109323128 B CN 109323128B CN 201811303104 A CN201811303104 A CN 201811303104A CN 109323128 B CN109323128 B CN 109323128B
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Abstract
The invention discloses a combined pressure regulating method of a variable frequency pump and a regulating valve of an oil pipeline, which is characterized in that the switching between four pressure regulating control modes is realized by respectively switching the use states of a variable frequency speed regulating pump and a regulating valve through a first manual/automatic change-over switch and a second manual/automatic change-over switch; the first voltage regulation control mode is as follows: the manual rotating speed of the variable-frequency speed regulating pump is controlled, and the manual valve position of the regulating valve is controlled; the second voltage regulation control mode is as follows: the variable-frequency speed regulating pump is used for automatic rotating speed control and the regulating valve is used for manual valve position control; the third voltage regulation control mode is as follows: the manual rotating speed of the variable-frequency speed regulating pump is controlled, and the automatic valve position of the regulating valve is controlled; the fourth voltage regulation control mode is as follows: the variable frequency speed regulating pump is used for controlling the automatic rotating speed and the regulating valve is used for controlling the automatic valve position. The invention has the beneficial effects that: the switching between four pressure regulating control modes of the variable-frequency speed regulating pump and the regulating valve can be realized.
Description
Technical Field
The invention relates to the technical field of oil pipelines, in particular to a combined pressure regulating method of an oil pipeline variable frequency pump and a regulating valve.
Background
In an oil pipeline station, the flow and pressure of an oil pipeline need to be detected and controlled in order to meet the normal operation of the pipeline. In the past, two methods are mainly adopted for adjusting the pressure of a pump station entering and exiting the station: the method comprises the steps that according to pressure sensors of an in-out station, the rotating speed of a variable-frequency speed regulating pump is adjusted through two PID controllers of the in-out station, so that the pressure of the in-out port of a pump station is controlled; and secondly, adjusting the opening of a main pump outlet adjusting valve by two PID controllers of the station according to pressure sensors of the station, so as to control the pressure of the pump station inlet and outlet.
Along with the popularization of frequency converter technology and the use of a large number of variable frequency speed control pumps, more and more oil transportation stations are provided with two kinds of pressure regulating equipment, namely variable frequency speed control pumps and regulating valves. If the PID control is simply put into use for all the two pressure regulating devices, the system is unstable, and the same pressure set value can lead the two different pressure regulating devices to mutually interfere and vibrate. At present, the common solution is that when the variable frequency speed control pump operates in PID pressure control, the manual valve position control of the regulating valve is carried out; and when the PID pressure of the regulating valve is controlled, the manual rotating speed of the variable-frequency speed regulating pump is controlled. In two kinds of pressure regulating equipment of variable frequency speed regulating pump and governing valve, only one can be put into use PID pressure control.
This method has the following disadvantages: the PID pressure control range of the variable-frequency speed control pump is small, only the minimum rotating speed is supported to the maximum rotating speed, and the full-head range of the variable-frequency speed control pump cannot be regulated; secondly, when the pressure of the variable-frequency speed control pump is reduced to the lowest rotating speed and is still too high, the variable-frequency speed control pump needs to be manually set at the lowest rotating speed, and the regulating valve is switched to PID pressure control to continuously regulate the pressure, and the process can be manually finished only; and thirdly, under the manual rotating speed control of the variable-frequency speed control pump, after the PID pressure control of the regulating valve is fully opened, the pressure cannot reach a set value, the rotating speed of the pump still has residual force, the regulating valve is manually switched to a manual valve position to be fully opened, and the variable-frequency speed control pump is switched to the PID pressure control.
Generally speaking, the frequency conversion speed regulating pump must artifical manual completion with the governing valve cooperation pressure regulating, wastes time and energy, has the not timely and maloperation risk of switching operation inadequately.
Disclosure of Invention
In order to solve the above problems, the present invention provides a method for jointly regulating pressure of an oil pipeline variable frequency pump and a regulating valve, which can realize switching between four pressure regulating control modes of the variable frequency variable speed pump and the regulating valve.
The invention provides a combined pressure regulating method of an oil pipeline variable frequency pump and a regulating valve, wherein a first pressure transmitter, a first pressure indicator, a first process gate valve, a second pressure transmitter, a second pressure indicator, a variable frequency speed regulating pump, a third pressure indicator, a third pressure transmitter, a second process gate valve, a fourth pressure transmitter, a fourth pressure indicator, a first process ball valve, a fifth pressure indicator, a regulating valve, a sixth pressure indicator, a second process ball valve and a fifth pressure transmitter are sequentially arranged on a process pipeline;
connecting a bypass pipeline to the process pipeline between the first process gate valve and the second process gate valve, and connecting a check valve on the bypass pipeline along the flow direction of the oil product;
the switching between the four pressure regulating control modes is realized by respectively switching the application states of the variable-frequency speed regulating pump and the regulating valve through a first manual/automatic change-over switch and a second manual/automatic change-over switch;
the first voltage regulation control mode is as follows: the manual rotating speed of the variable-frequency speed regulating pump is controlled, and the manual valve position of the regulating valve is controlled;
the second voltage regulation control mode is as follows: the variable-frequency speed regulating pump is used for automatic rotating speed control and the regulating valve is used for manual valve position control;
the third voltage regulation control mode is as follows: the manual rotating speed of the variable-frequency speed regulating pump is controlled, and the automatic valve position of the regulating valve is controlled;
the fourth voltage regulation control mode is as follows: the variable frequency speed regulating pump is used for controlling the automatic rotating speed and the regulating valve is used for controlling the automatic valve position.
As a further improvement of the invention, when the first voltage regulation control mode is selected:
the rotating speed of the variable-frequency speed-regulating pump is directly set through the first manual/automatic change-over switch;
and the valve position opening degree of the regulating valve is directly set through the second manual/automatic change-over switch.
As a further improvement of the present invention, when the second voltage regulation control mode is selected:
the two input ends of a first low-selection controller are respectively connected to a first pressure controller connected with a first pressure transmitter and a fourth pressure controller connected with a fifth pressure transmitter, the output end of the first low-selection controller is connected to the variable-frequency speed-regulating pump, the first pressure controller and the fourth pressure controller start to work and respectively calculate different pump rotating speeds, and the first low-selection controller selects a smaller pump rotating speed from the outputs of the first pressure controller and the fourth pressure controller and outputs the smaller pump rotating speed to the variable-frequency speed-regulating pump;
and the valve position opening degree of the regulating valve is directly set through the second manual/automatic change-over switch.
As a further improvement of the present invention, when the control mode of the variable-frequency speed-regulating pump is switched from manual to automatic, the fourth pressure controller is switched without disturbance, and the first pressure controller is not switched without disturbance, so that the variable-frequency speed-regulating pump realizes automatic rotation speed control under the control of the fourth pressure controller.
As a further improvement of the present invention, when the third voltage regulation control mode is selected:
the rotating speed of the variable-frequency speed-regulating pump is directly set through the first manual/automatic change-over switch;
the two input ends of a second low-selection controller are respectively connected into a second pressure controller connected with a first pressure transmitter and a third pressure controller connected with a fifth pressure transmitter, the output end of the second low-selection controller is connected into the regulating valve, the second pressure controller and the third pressure controller start to work and respectively calculate different valve position opening degrees, and the second low-selection controller selects a smaller valve position opening degree from the output ends of the second pressure controller and the third pressure controller and outputs the smaller valve position opening degree to the regulating valve.
As a further improvement of the present invention, when the control mode of the regulating valve is switched from manual to automatic, the third pressure controller is switched undisturbed, and the second pressure controller is not switched undisturbed, so that the regulating valve realizes automatic valve position control under the control of the third pressure controller.
As a further improvement of the present invention, when the fourth voltage regulation control mode is selected:
respectively connecting two input ends of a first low-selection controller into a first pressure controller connected with a first pressure transmitter and a fourth pressure controller connected with a fifth pressure transmitter, and connecting an output end of the first low-selection controller into the variable-frequency speed-regulating pump;
two input ends of a second low-selection controller are respectively connected to a second pressure controller connected with the first pressure transmitter and a third pressure controller connected with a fifth pressure transmitter, and the output end of the second low-selection controller is connected to the regulating valve;
maintaining a difference between the pressure set point of the first pressure controller and the pressure set point of the second pressure controller, and maintaining a difference between the pressure set points of the third pressure controller and the fourth pressure controller;
the first pressure controller and the fourth pressure controller start to work, different pump rotating speeds are obtained through calculation respectively, and the first low-selection controller selects a smaller pump rotating speed from the outputs of the first pressure controller and the fourth pressure controller and outputs the smaller pump rotating speed to the variable-frequency speed-regulating pump;
the second pressure controller and the third pressure controller start to work, different valve position opening degrees are obtained through calculation respectively, and the second low-selection controller selects a smaller valve position opening degree from outputs of the second pressure controller and the third pressure controller and outputs the smaller valve position opening degree to the regulating valve.
As a further improvement of the present invention, the pressure set value of the first pressure controller is SP1, the pressure set value of the second pressure controller is SP1- △ P1, the pressure set value of the fourth pressure controller is SP2, and the pressure set value of the third pressure controller is SP2+ △ P2.
As a further improvement of the invention, △ P1 is 0.05MPa, and &lTtTtransformation = Δ "&gTt &lTt/T &gTtP2 is 0.1 MPa.
As a further improvement of the present invention, when the control mode of the variable-frequency speed-regulating pump is switched from manual to automatic, the fourth pressure controller is switched undisturbed, and the first pressure controller is not switched undisturbed, so that the variable-frequency speed-regulating pump realizes automatic rotation speed control under the control of the fourth pressure controller;
when the control mode of the regulating valve is switched from manual to automatic, undisturbed switching is carried out on the third pressure controller, undisturbed switching is not carried out on the second pressure controller, and therefore the regulating valve can realize automatic valve position control under the control of the third pressure controller.
The invention has the beneficial effects that:
the combined pressure regulating control mode of the variable-frequency speed regulating pump and the regulating valve is flexible and changeable through the operation of the first manual/automatic change-over switch and the second manual/automatic change-over switch;
the two low-selection controllers are respectively applied to two pressure regulating devices, namely a variable-frequency speed regulating pump and a regulating valve, so that two risks that the pressure of an oil pipeline station at the outlet is not ultra high and the pressure of the oil pipeline station at the inlet is not ultra low are greatly reduced;
the pressure setting values of the pressure controllers are different, the variable-frequency speed regulating pump and the pressure regulating valve can be simultaneously used for PID pressure control, online hot standby is realized, the pressure control stability, the real-time performance and the reliability of an oil pipeline station are greatly improved, and the variable-frequency speed regulating pump has the advantages of high control precision, high speed, stable operation and convenience in realization and maintenance.
Drawings
Fig. 1 is a schematic structural diagram of a combined pressure regulating device of an oil pipeline variable frequency pump and a regulating valve according to an embodiment of the invention.
In the figure, the position of the upper end of the main shaft,
1. a first flange; 2. a process line; 3. a first process gate valve; 4. a variable frequency speed regulating pump; 5. a second process gate valve; 6. a bypass line; 7. a check valve; 8. a first process ball valve; 9. adjusting a valve; 10. a second process ball valve; 11. a second flange; 12. a first pressure transmitter; 13. a first pressure indicator; 14. a second pressure transmitter; 15. a second pressure indicator; 16. a third pressure indicator; 17. a third pressure transmitter; 18. a fourth pressure transmitter; 19. a fourth pressure indicator; 20. a fifth pressure indicator; 21. a sixth pressure indicator; 22. a fifth pressure transmitter; 23. a first pressure controller; 24. a second pressure controller; 25. a third pressure controller; 26. a fourth pressure controller; 27. a first low-selection controller; 28. a second low-selection controller; 29. a first manual/automatic change-over switch; 30. a second manual/automatic change-over switch; 31. a first instrument cable; 32. a second instrument cable; 33. a third instrument cable; 34. a fourth instrument cable; 35. a fifth instrument cable; 36. a sixth instrument cable; 37. a seventh instrument cable; 38. an eighth instrument cable; 39. a ninth instrument cable; 40. a tenth instrument cable; 41. an eleventh instrument cable; 42. a twelfth instrument cable.
Detailed Description
The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.
The oil pipeline variable frequency pump and regulating valve combined pressure regulating method of the embodiment of the invention is based on the oil pipeline variable frequency pump and regulating valve combined pressure regulating device shown in figure 1, and the device comprises:
the two ends of the process pipeline 2 are respectively connected with a first flange 1 and a second flange 11, and a first pressure transmitter 12, a first pressure indicator 13, a first process gate valve 3, a second pressure transmitter 14, a second pressure indicator 15, a variable-frequency speed-regulating pump 4, a third pressure indicator 16, a third pressure transmitter 17, a second process gate valve 5, a fourth pressure transmitter 18, a fourth pressure indicator 19, a first process ball valve 8, a fifth pressure indicator 20, a regulating valve 9, a sixth pressure indicator 21, a second process ball valve 10 and a fifth pressure transmitter 22 are sequentially arranged between the first flange 1 and the second flange 11.
A bypass line 6, one end of which is connected to the process line 2 between the first pressure indicator 13 and the first process gate valve 3, the other end of the bypass line 6 is connected to the process line 2 between the second process gate valve 5 and the fourth pressure transmitter 18, and the bypass line 6 is connected to the check valve 7 along the oil flow direction;
the pressure control device comprises a first pressure controller 23 and a second pressure controller 24 connected with the first pressure transmitter 12, a third pressure controller 25 and a fourth pressure controller 26 connected with the fifth pressure transmitter 22, a first low-selection controller 27 connected with the first pressure controller 23 and the fourth pressure controller 26, a second low-selection controller 28 connected with the second pressure controller 24 and the third pressure controller 25, a first manual/automatic switch 29 connected with the first low-selection controller 27 and the variable-frequency speed-regulating pump 4, and a second manual/automatic switch 30 connected with the second low-selection controller 28 and the regulating valve 9.
Wherein, the first pressure controller 23 is connected with the first pressure transmitter 12 through a first instrument cable 31, the second pressure controller 24 is connected with the first pressure transmitter 12 through a second instrument cable 32, the third pressure controller 25 is connected with the fifth pressure transmitter 22 through a third instrument cable 33, the fourth pressure controller 26 is connected with the fifth pressure transmitter 22 through a fourth instrument cable 34, the first low-selection controller 27 is connected with the first pressure controller 23 through a fifth instrument cable 35, the second low-selection controller 28 is connected with the second pressure controller 24 through a sixth instrument cable 36, the second low-selection controller 28 is connected with the third pressure controller 25 through a seventh instrument cable 37, the first low-selection controller 27 is connected with the fourth pressure controller 26 through an eighth instrument cable 38, the first manual/automatic change-over switch 29 is connected with the first low-selection controller 27 through a ninth instrument cable 39, the second manual/automatic change-over switch 30 is connected with the second low-selection controller 28 through a tenth instrument cable 40, the first manual/automatic change-over switch 29 is connected with the variable-frequency speed-regulating pump 4 through an eleventh instrument cable 41, and the second manual/automatic change-over switch 30 is connected with the regulating valve 9 through a twelfth instrument cable 42.
The oil pipeline variable frequency pump and regulating valve combined pressure regulating method comprises the following steps:
a first pressure transmitter 12, a first pressure indicator 13, a first process gate valve 3, a second pressure transmitter 14, a second pressure indicator 15, a variable-frequency speed-regulating pump 4, a third pressure indicator 16, a third pressure transmitter 17, a second process gate valve 5, a fourth pressure transmitter 18, a fourth pressure indicator 19, a first process ball valve 8, a fifth pressure indicator 20, a regulating valve 9, a sixth pressure indicator 21, a second process ball valve 10 and a fifth pressure transmitter 22 are sequentially arranged on the process pipeline 2;
connecting a bypass pipeline 6 to the process pipeline 2 between the first process gate valve 3 and the second process gate valve 5, and connecting a check valve 7 on the bypass pipeline 6 along the flow direction of the oil product;
the switching between the four pressure regulating control modes is realized by switching the use states of the variable-frequency speed regulating pump 4 and the regulating valve 9 through the first manual/automatic change-over switch 29 and the second manual/automatic change-over switch 30 respectively.
The first voltage regulation control mode is as follows: the frequency conversion speed regulating pump 4 is controlled by the manual rotating speed and the regulating valve 9 is controlled by the manual valve position. The control method of the voltage regulation control mode comprises the following steps: the rotating speed of the variable-frequency speed-regulating pump 4 is directly set through a first manual/automatic change-over switch 29, and the valve position opening of the regulating valve 9 is directly set through a second manual/automatic change-over switch 30.
The second voltage regulation control mode is as follows: the frequency conversion speed regulating pump 4 is controlled by the automatic rotating speed and the regulating valve 9 is controlled by the manual valve position. At this time, the first low-selection controller 27 needs to be applied to the variable frequency speed pump 4. The control method of the voltage regulation control mode comprises the following steps: two input ends of a first low-selection controller 27 are respectively connected to a first pressure controller 23 connected with the first pressure transmitter 12 and a fourth pressure controller 26 connected with the fifth pressure transmitter 22, an output end of the first low-selection controller 27 is connected to the variable-frequency speed-regulating pump 4, the first pressure controller 23 and the fourth pressure controller 26 start to work and respectively calculate different pump rotating speeds, and the first low-selection controller 27 selects a smaller pump rotating speed from outputs of the first pressure controller 23 and the fourth pressure controller 26 and outputs the smaller pump rotating speed to the variable-frequency speed-regulating pump 4; the valve position opening of the regulating valve 9 is directly set by the second manual/automatic changeover switch 30.
In the switching of the pressure regulating mode, when the control mode of the variable-frequency speed-regulating pump 4 is switched from manual to automatic, the four-pressure controller 26 is switched without disturbance, and the first pressure controller 23 is not switched without disturbance, so that the variable-frequency speed-regulating pump 4 realizes automatic rotation speed control under the control of the fourth pressure controller 26.
The third voltage regulation control mode is as follows: the frequency conversion speed regulating pump 4 is controlled by the manual rotating speed and the regulating valve 9 is controlled by the automatic valve position. At this time, the second low select controller 28 needs to be applied to the regulator valve 9. The control method of the voltage regulation control mode comprises the following steps: the rotating speed of the variable-frequency speed-regulating pump 4 is directly set through a first manual/automatic change-over switch 29; two input ends of a second low-selection controller 28 are respectively connected to a second pressure controller 24 connected with the first pressure transmitter 12 and a third pressure controller 25 connected with the fifth pressure transmitter 22, an output end of the second low-selection controller 28 is connected to the regulating valve 9, the second pressure controller 24 and the third pressure controller 25 start to work, different valve position opening degrees are respectively obtained through calculation, and the second low-selection controller 28 selects a smaller valve position opening degree from outputs of the second pressure controller 24 and the third pressure controller 25 and outputs the smaller valve position opening degree to the regulating valve 9.
In the switching of the pressure regulating modes, when the control mode of the regulating valve 9 is switched from manual to automatic, undisturbed switching is performed on the third pressure controller 25, undisturbed switching is not performed on the second pressure controller 24, and therefore the regulating valve 9 can realize automatic valve position control under the control of the third pressure controller 25.
The fourth voltage regulation control mode is as follows: the frequency conversion speed regulating pump 4 is automatically controlled in rotating speed and the regulating valve 9 is automatically controlled in valve position. At this time, the first low-selection controller 27 and the second low-selection controller 28 are respectively applied to two pressure regulating devices, namely the variable-frequency speed regulating pump 4 and the regulating valve 9. The control method of the voltage regulation control mode comprises the following steps: two input ends of a first low-selection controller 27 are respectively connected into a first pressure controller 23 connected with the first pressure transmitter 12 and a fourth pressure controller 26 connected with the fifth pressure transmitter 22, and the output end of the first low-selection controller 27 is connected into the variable-frequency speed-regulating pump 4; two input ends of a second low-selection controller 28 are respectively connected into a second pressure controller 24 connected with the first pressure transmitter 12 and a third pressure controller 25 connected with the fifth pressure transmitter 22, and the output end of the second low-selection controller 28 is connected into the regulating valve 9; the pressure set value of the first pressure controller 23 and the pressure set value of the second pressure controller 24 are kept different, and the pressure set values of the third pressure controller 25 and the fourth pressure controller 26 are kept different; the first pressure controller 23 and the fourth pressure controller 26 start to work, different pump rotating speeds are obtained through calculation respectively, and the first low-selection controller 27 selects a smaller pump rotating speed from the outputs of the first pressure controller 23 and the fourth pressure controller 26 and outputs the smaller pump rotating speed to the variable-frequency speed-regulating pump 4; the second pressure controller 24 and the third pressure controller 25 start to operate, different valve position opening degrees are respectively calculated, and the second low-selection controller 28 selects a smaller valve position opening degree from the outputs of the second pressure controller 24 and the third pressure controller 25 and outputs the smaller valve position opening degree to the regulating valve 9.
In the method, when the pressure set values of the first pressure controller 23, the second pressure controller 24, the third pressure controller 25 and the fourth pressure controller 26 are set, the pressure set values of the first pressure controller 23 and the second pressure controller 24 are kept to be different, the pressure set values of the third pressure controller 25 and the fourth pressure controller 26 are kept to be different, so that the automatic joint regulation function of the variable frequency speed regulating pump 4 and the regulating valve 9 is realized, the robustness of the whole combined pressure regulating device is kept, and the situation that the control is unstable due to the consistency of the pressure set values is avoided.
In the switching of the pressure regulating modes, when the control mode of the variable-frequency speed regulating pump 4 is switched from manual to automatic, the four-pressure controller 26 is switched without disturbance, and the first pressure controller 23 is not switched without disturbance, so that the variable-frequency speed regulating pump 4 realizes automatic rotating speed control under the control of the fourth pressure controller 26; when the control mode of the regulating valve 9 is switched from manual to automatic, undisturbed switching is performed on the third pressure controller 25, undisturbed switching is not performed on the second pressure controller 24, and therefore the regulating valve 9 can realize automatic valve position control under the control of the third pressure controller 25.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A combined pressure regulating method of a variable frequency pump and a regulating valve of an oil pipeline is characterized in that,
a first pressure transmitter (12), a first pressure indicator (13), a first process gate valve (3), a second pressure transmitter (14), a second pressure indicator (15), a variable-frequency speed-regulating pump (4), a third pressure indicator (16), a third pressure transmitter (17), a second process gate valve (5), a fourth pressure transmitter (18), a fourth pressure indicator (19), a first process ball valve (8), a fifth pressure indicator (20), a regulating valve (9), a sixth pressure indicator (21), a second process ball valve (10) and a fifth pressure transmitter (22) are sequentially arranged on a process pipeline (2);
connecting a bypass line (6) to the process line (2) between the first process gate valve (3) and the second process gate valve (5), and connecting a check valve (7) in the oil flow direction on the bypass line (6);
the switching between the four pressure regulating control modes is realized by respectively switching the use states of the variable-frequency speed regulating pump (4) and the regulating valve (9) through a first manual/automatic change-over switch (29) and a second manual/automatic change-over switch (30);
wherein the content of the first and second substances,
the first voltage regulation control mode is as follows: the variable-frequency speed regulating pump (4) is controlled by manual rotating speed and the regulating valve (9) is controlled by manual valve position;
the second voltage regulation control mode is as follows: the variable-frequency speed regulating pump (4) is controlled by the automatic rotating speed and the regulating valve (9) is controlled by the manual valve position;
the third voltage regulation control mode is as follows: the variable-frequency speed regulating pump (4) is controlled by manual rotating speed and the regulating valve (9) is controlled by automatic valve position;
the fourth voltage regulation control mode is as follows: the variable-frequency speed regulating pump (4) is automatically controlled in rotating speed and the regulating valve (9) is automatically controlled in valve position;
two input ends of a first low-selection controller (27) are respectively connected into a first pressure controller (23) connected with a first pressure transmitter (12) and a fourth pressure controller (26) connected with a fifth pressure transmitter (22), and the output end of the first low-selection controller (27) is connected into the variable-frequency speed-regulating pump (4);
two input ends of a second low-selection controller (28) are respectively connected into a second pressure controller (24) connected with the first pressure transmitter (12) and a third pressure controller (25) connected with a fifth pressure transmitter (22), and the output end of the second low-selection controller (28) is connected into the regulating valve (9);
-maintaining a difference between the pressure set-point of the first pressure controller (23) and the pressure set-point of the second pressure controller (24), and maintaining a difference between the pressure set-points of the third pressure controller (25) and the fourth pressure controller (26);
when the control mode of the variable-frequency speed-regulating pump (4) is switched from manual to automatic, the fourth pressure controller (26) is switched without disturbance, and the first pressure controller (23) is not switched without disturbance, so that the variable-frequency speed-regulating pump (4) realizes automatic rotating speed control under the control of the fourth pressure controller (26);
when the control mode of the regulating valve (9) is switched from manual to automatic, undisturbed switching is performed on the third pressure controller (25), undisturbed switching is not performed on the second pressure controller (24), and therefore the regulating valve (9) can realize automatic valve position control under the control of the third pressure controller (25).
2. The oil pipeline variable frequency pump and regulating valve combined pressure regulating method according to claim 1, characterized in that when the first pressure regulating control mode is selected:
the rotating speed of the variable-frequency speed-regulating pump (4) is directly set through the first manual/automatic change-over switch (29);
the valve position opening degree of the regulating valve (9) is directly set through the second manual/automatic switch (30).
3. The oil pipeline variable frequency pump and regulating valve combined pressure regulating method according to claim 1, characterized in that when the second pressure regulating control mode is selected:
the two input ends of a first low-selection controller (27) are respectively connected into a first pressure controller (23) connected with a first pressure transmitter (12) and a fourth pressure controller (26) connected with a fifth pressure transmitter (22), the output end of the first low-selection controller (27) is connected into the variable-frequency speed-regulating pump (4), the first pressure controller (23) and the fourth pressure controller (26) start to work and respectively calculate different pump rotating speeds, and the first low-selection controller (27) selects a smaller pump rotating speed from the outputs of the first pressure controller (23) and the fourth pressure controller (26) and outputs the smaller pump rotating speed to the variable-frequency speed-regulating pump (4);
the valve position opening degree of the regulating valve (9) is directly set through the second manual/automatic switch (30).
4. The oil pipeline variable frequency pump and regulating valve combined pressure regulating method according to claim 3, characterized in that when the control mode of the variable frequency and speed regulating pump (4) is switched from manual to automatic, the fourth pressure controller (26) is switched without disturbance, and the first pressure controller (23) is not switched without disturbance, so that the variable frequency and speed regulating pump (4) realizes automatic rotation speed control under the control of the fourth pressure controller (26).
5. The oil pipeline variable frequency pump and regulating valve combined pressure regulating method according to claim 1, characterized in that when the third pressure regulating control mode is selected:
the rotating speed of the variable-frequency speed-regulating pump (4) is directly set through the first manual/automatic change-over switch (29);
two input ends of a second low-selection controller (28) are respectively connected into a second pressure controller (24) connected with the first pressure transmitter (12) and a third pressure controller (25) connected with a fifth pressure transmitter (22), the output end of the second low-selection controller (28) is connected into the regulating valve (9), the second pressure controller (24) and the third pressure controller (25) start to work and respectively calculate different valve position opening degrees, and the second low-selection controller (28) selects a smaller valve position opening degree from the outputs of the second pressure controller (24) and the third pressure controller (25) and outputs the smaller valve position opening degree to the regulating valve (9).
6. The oil pipeline variable frequency pump and regulating valve combined pressure regulating method according to claim 5, characterized in that when the control mode of the regulating valve (9) is switched from manual to automatic, the third pressure controller (25) is switched undisturbed, and the second pressure controller (24) is not switched undisturbed, so that the regulating valve (9) realizes automatic valve position control under the control of the third pressure controller (25).
7. The oil pipeline variable frequency pump and regulating valve combined pressure regulating method according to claim 1, characterized in that when the fourth pressure regulating control mode is selected:
the first pressure controller (23) and the fourth pressure controller (26) start to work, different pump rotating speeds are obtained through calculation respectively, and the first low-selection controller (27) selects a smaller pump rotating speed from the outputs of the first pressure controller (23) and the fourth pressure controller (26) and outputs the smaller pump rotating speed to the variable-frequency speed-regulating pump (4);
the second pressure controller (24) and the third pressure controller (25) start to work, different valve position opening degrees are obtained through calculation respectively, and the second low-selection controller (28) selects a smaller valve position opening degree from outputs of the second pressure controller (24) and the third pressure controller (25) and outputs the smaller valve position opening degree to the regulating valve (9).
8. The combined variable pressure regulating method for a variable frequency pump and a regulator valve of a oil pipeline according to claim 7, wherein the pressure set value of the first pressure controller (23) is SP1, the pressure set value of the second pressure controller (24) is SP1- △ P1, the pressure set value of the fourth pressure controller (26) is SP2, and the pressure set value of the third pressure controller (25) is SP2+ △ P2.
9. The method of claim 8, wherein △ P1 is 0.05MPa, and wherein &lTtT transformation = & "Δ" &gTt &/T &gTtP2 is 0.1 MPa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811303104.4A CN109323128B (en) | 2018-11-02 | 2018-11-02 | Oil pipeline variable frequency pump and regulating valve combined pressure regulating method |
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| CN201811303104.4A CN109323128B (en) | 2018-11-02 | 2018-11-02 | Oil pipeline variable frequency pump and regulating valve combined pressure regulating method |
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| CN109323128A CN109323128A (en) | 2019-02-12 |
| CN109323128B true CN109323128B (en) | 2020-06-23 |
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| CN201811303104.4A Active CN109323128B (en) | 2018-11-02 | 2018-11-02 | Oil pipeline variable frequency pump and regulating valve combined pressure regulating method |
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Address after: 100120 Beijing Xicheng District six laying Kang Applicant after: CHINA NATIONAL PETROLEUM Corp. Applicant after: CHINA PETROLEUM PIPELINE ENGINEERING Co.,Ltd. Applicant after: DESIGN BRANCH OF CHINA PETROLEUM PIPELINE ENGINEERING Corp. Address before: 100120 Beijing Xicheng District six laying Kang Applicant before: China National Petroleum Corp. Applicant before: CHINA PETROLEUM PIPELINE ENGINEERING Co.,Ltd. Applicant before: DESIGN BRANCH OF CHINA PETROLEUM PIPELINE ENGINEERING Corp. |
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Effective date of registration: 20200515 Address after: 100007 Beijing, Dongzhimen, North Street, No. 9, No. Applicant after: CHINA NATIONAL PETROLEUM Corp. Applicant after: CHINA PETROLEUM PIPELINE ENGINEERING Co.,Ltd. Applicant after: CHINA PETROLEUM PIPELINE ENGINEERING Corp. Address before: 100120 Beijing Xicheng District six laying Kang Applicant before: CHINA NATIONAL PETROLEUM Corp. Applicant before: CHINA PETROLEUM PIPELINE ENGINEERING Co.,Ltd. Applicant before: DESIGN BRANCH OF CHINA PETROLEUM PIPELINE ENGINEERING Corp. |
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