Inlet booster system

Abstract

The application provides an inlet pressurization system, wherein an outlet high-pressure pipe is connected to an outlet of a centrifugal pump, the outlet high-pressure pipe is connected with a throttle valve, the other end of the throttle valve is connected with a pressurized jet injector through a flow guide pipe, one end of the pressurized jet injector is connected with an inlet low-pressure pipe, the other end of the pressurized jet injector is connected with a mixed pressure device, and the tail end of the mixed pressure device is connected with the inlet of the centrifugal pump. The system has simple structure, high efficiency, easy maintenance and low cost, and effectively solves the cavitation problem, the evacuation problem and other problems caused by low pressure of the centrifugal pump in conveying easy-vaporization medium.

Description

Technical Field

[0001] The invention belongs to the technical field of centrifugal pump equipment, and in particular relates to an inlet boosting system for a centrifugal pump. Background Art

[0002] The transportation of low-pressure, easily vaporized fluids and high-speed, high-pressure liquids has long been a major cause of damage to fluid equipment. API 610 (American Petroleum Institute) provides a centrifugal pump solution for transporting easily vaporized fluids. This solution involves pumping the low-pressure, easily vaporized fluid into a sealed barrel bag, where it accumulates and increases pressure, before entering the pump body to achieve inlet pressure boost and prevent vaporization damage. This solution makes pump installation and maintenance difficult, resulting in high costs and a high risk of accidents. Summary of the Invention

[0003] To solve the above problems, the present invention provides a new inlet boosting system, which solves the cavitation problems, vacuum problems and other equipment and process damage caused by low pressure faced by centrifugal pumps when conveying easily gasified media.

[0004] The technical solution adopted by the present invention is: an inlet boosting system, the outlet of the centrifugal pump is connected to the outlet high-pressure pipe, the outlet high-pressure pipe is connected to one end of the throttle valve, the other end of the throttle valve is connected to the injection and pressure ejector through a guide pipe, one end of the injection and pressure ejector is connected to the inlet low-pressure pipe, and the other end is connected to the mixing device, and the tail end of the mixing device is connected to the inlet of the centrifugal pump.

[0005] Further optimization, the pressure mixing device is a mixer installed in the pressure mixing device pipeline near the injection jet position and a flow stabilizer installed in the pressure mixing device pipeline near the centrifugal pump, which is mainly used for uniform mixing and pressure stabilization of high-pressure liquid and low-pressure liquid.

[0006] The injection-pressure ejector has been further optimized to a dual-cavity structure, with several rotating nozzles on the sidewall of the outer ring cavity. High-pressure liquid flows into the outer ring cavity of the injection-pressure ejector through a guide tube, enters the inner ring cavity through the rotating nozzle, and mixes with the low-pressure liquid flowing in from the inlet low-pressure pipe. It then passes through a pressure mixer, achieving a uniform mixing of high and low pressures and a stable pressure state. A guide baffle, diffuser plate, or directional balancing hole is installed on the inner wall of the inner ring cavity near the inlet low-pressure pipe. This is mainly used to adjust the flow direction of the low-pressure liquid to achieve mixing at the same angle as the high-pressure liquid.

[0007] Further optimized, the mixer is a guide baffle, a diffuser plate or a directional balancing hole.

[0008] Further optimization, the flow stabilizer is a flow stabilizing net with a plurality of through holes evenly distributed or a flow stabilizing plate with a plurality of through holes opened on the outer side of the circumference.

[0009] For further optimization, a filter or solid-liquid separation device is installed at the connection between the outlet high-pressure pipe and the throttle valve.

[0010] For further optimization, a directional heat exchanger is installed on the outside of the pipe wall of the mixing device.

[0011] For further optimization, a front measuring instrument interface is left at the inlet low-pressure pipe, and a rear measuring instrument interface is left at the mixing pressure device pipeline, which can be connected to a variety of pressure detection instruments for on-site display or remote monitoring.

[0012] The beneficial effects of the present invention are: the system structure of the present invention is simple, efficient, easy to maintain, and low cost, and effectively solves the cavitation problem, vacuum problem, and other equipment and process damage caused by low pressure when the centrifugal pump transports easily vaporized media. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a structural diagram of the inlet boosting system;

[0014] Figure 2 Schematic diagram of the cross-sectional structure of the injection jet;

[0015] Figure 3 Schematic diagram of the flow stabilizer structure.

[0016] Reference numerals: 1 - centrifugal pump 2 - outlet high-pressure pipe 3 - throttle valve 4 - flow guide pipe 5 - inlet low-pressure pipe 6 - directional heat exchanger 7 - pressure mixer 8 - injection jet 9 - flow stabilizer 10 - front measuring instrument interface 11 - rear measuring instrument interface 12 - filter 81 - outer ring cavity 82 - rotating nozzle 83 - inner ring cavity DETAILED DESCRIPTION

[0017] The inlet boosting system described in the present invention mainly solves the cavitation problems, vacuum problems, etc. faced by the centrifugal pump 1 when transporting easily gasified media, as well as other equipment and process damage caused by low pressure, and protects the pump group by adjusting the circulation volume and realizes constant speed output of various working conditions.

[0018] The most important feature is that by introducing a portion of the high-pressure liquid at the outlet of the centrifugal pump 1 into the low-pressure inlet, a series of flow limiting, pressure stabilization, and even temperature reduction measures are taken to uniformly mix the high-pressure liquid with the low-pressure inlet liquid to achieve the purpose of increasing the pump suction pressure. Figure 1-Figure 3 The present invention will be described in detail.

[0019] like Figure 1As shown, the outlet of the centrifugal pump 1 is connected to the outlet high-pressure pipe 2, which is connected to the throttle valve 3 through a pipeline. The other end of the throttle valve 3 is connected to the injection jet 8 through the guide pipe 4. The injection jet 8 is a three-way structure, with the upper end connected to the guide pipe 4, one end of the left and right ends connected to the inlet low-pressure pipe 5, and the other end connected to the mixer 7 pipeline. The tail end of the mixer 7 pipeline is connected to the inlet of the centrifugal pump 1. A flow stabilizer 9 is installed near the centrifugal pump 1 in the mixing device pipeline. Figure 3 As shown, the flow stabilizer 9 is a flow stabilizing net with a plurality of through holes evenly distributed, or a flow stabilizing plate with a plurality of through holes opened on the outer side of the circumference, or other forms. Different forms of flow stabilizers 9 are used according to the flow stabilization requirements of different liquids.

[0020] The mixer 7 can adopt various styles such as guide baffle, diffuser, directional balance hole, etc. according to the working conditions. Figure 1 As shown, the mixer 7 of this embodiment adopts a guide baffle style. When the high-pressure liquid flows along the guide tube 4 and enters the outer ring cavity 81 of the injection ejector 8, the high-speed high-pressure liquid is further decelerated and pressurized due to the increase in volume. After turning 90 degrees, it rotates along the pipe wall at a certain angle through the rotating nozzle 82 and enters the inner ring cavity 83. After mixing with the low-pressure liquid entering the inlet low-pressure pipe 5 in the same direction, it is further guided by the guide baffle of the mixer 7 to mix the high and low pressures for pressure stabilization. Then, after passing through the flow stabilizer 9, it enters the inlet of the centrifugal pump 1 in a state of equal pressure and flow after flow stabilization. The rotation angle is given by design calculation based on different parameters.

[0021] like Figure 2As shown, the injection jet 8 has a dual-cavity structure, with a plurality of rotating nozzles 82 on the sidewall of the outer ring cavity 81. High-pressure liquid flows into the outer ring cavity 81 of the injection jet 8 through the guide tube 4, enters the inner ring cavity 83 through the rotating nozzles 82, and mixes with the low-pressure liquid flowing in from the inlet low-pressure pipe 5 through the pressure mixer 7. The direction of the rotating nozzles 82 is 90° to the direction in which the high-pressure liquid is injected into the outer ring cavity 81, turning the ejection direction of the high-pressure liquid ejected from the rotating nozzles 82 by 90°, changing the ejection direction of the high-pressure liquid to be parallel to the inlet low-pressure pipe 5, that is, in the same direction as the low-pressure liquid entering through the inlet low-pressure pipe 5. A guide plate with a calculated angle is fixed at the position of each rotating nozzle 82 to adjust the ejection direction of the high-pressure liquid to spiral ejection, which is more conducive to the mixing of high-pressure and low-pressure liquids. When the high-pressure and low-pressure liquids are difficult to mix, a low-pressure liquid mixing guide plate is added to the inner wall of the inner ring cavity 83. By designing the guide angle of the guide plate, the spiral direction of the low-pressure liquid is consistent with that of the high-pressure liquid ejected from the rotating nozzle 82, thereby achieving a better mixing effect. In addition to using the guide plate as a guide mixing device, a diffuser plate or a directional balance hole can be used according to the different types of liquids to achieve the same effect as the guide plate. The injection jet 8 must not cause a large pipe resistance, but must also ensure that the high-pressure liquid can be evenly injected into the low-pressure liquid with minimal loss, and ensure that the high-pressure liquid and the low-pressure liquid are entangled and mixed in the same direction at a 0-angle angle to reduce the impact loss of the high- and low-pressure liquid flows.

[0022] like Figure 1 As shown, a filter screen 12 is installed at the connection between the outlet high-pressure pipe 2 and the throttle valve 3, which is mainly used to filter a part of the high-pressure liquid diverted from the centrifugal pump 1 to prevent particles from damaging the inlet boosting device of the present invention. A directional heat exchanger 6 is installed on the outside of the pipe wall of the mixing device, which is mainly used to cool high-temperature liquids that need to be cooled, or to heat low-temperature liquids that need to be kept warm. The coolant or heating agent enters the cavity of the directional heat exchanger 6 from the inlet of the directional heat exchanger 6 in a direction countercurrent to the inlet flow direction of the centrifugal pump 1, and is discharged from the outlet of the directional heat exchanger 6 after uniform heat exchange to improve the temperature of the liquid in the main line. Temperature measuring instruments can also be added to the front and rear ends of the device of the present invention to monitor the temperature in real time. The present invention only introduces one form of heat exchange. There are multiple design schemes for the directional heat exchanger 6 to adapt to different working conditions.

[0023] The system of the present invention reserves a front measuring instrument interface 10 and a rear measuring instrument interface 11, which can be connected to a variety of pressure detection instruments, for on-site display or remote control, such as a pressure gauge, a differential pressure gauge, a pressure sensor, a differential pressure sensor, etc. The pressure increased by the inlet boosting system of the present invention can be displayed on-site or remotely transmitted to the control room in real time. When using a remote transmission instrument, it can also be interlocked with the throttle valve 3 through a PLC or DCS, and the injection flow can be adjusted in real time by adjusting the throttle valve 3 to increase the inlet pressure of the centrifugal pump 1. The throttle valve 3 can also play a role in protecting the pump unit. When the process conditions require the pump unit to operate at different flow rates, especially when the pump unit needs to operate at a very small flow rate, the throttle valve 3 can be adjusted to adjust the return flow of the pump unit and then adjust the flow required by the process conditions. In this way, the pump will not be damaged due to long-term operation at a small flow rate, and the demand for different process flow rate regulation can also be met.

[0024] During operation, the system of the present invention is used to pressurize the low-pressure liquid entering the inlet low-pressure pipe 5. The specific working process is as follows:

[0025] Part of the high-pressure liquid flows from the outlet of the centrifugal pump 1 into the outlet high-pressure pipe 2, then passes through the throttle valve 3 according to the calculated flow rate, and after being quantitatively measured, it enters the outer ring cavity 81 of the injection and pressure ejector 8 through the guide pipe 4 and is injected into the inner ring cavity 83 at a set specific angle through the rotating nozzle 82, mixing with the low-pressure liquid entering from the inlet low-pressure pipe 5. The high-pressure liquid and the low-pressure liquid are then fully mixed through the mixer 7 at a specific rotation angle or expansion and contraction angle. The mixed liquid then passes through the flow stabilizer 9 and enters the centrifugal pump 1 at a pressure higher than the inlet pressure, thereby increasing the pump inlet pressure. For liquids that need to be cooled or heated, they are cooled or heated through the directional heat exchanger 6.

Claims

1. An inlet pressurization system, characterized in that: The outlet of the centrifugal pump (1) is connected to an outlet high-pressure pipe (2), the outlet high-pressure pipe (2) is connected to one end of a throttle valve (3), the other end of the throttle valve (3) is connected to an injection jet (8) through a guide pipe (4), one end of the injection jet (8) is connected to an inlet low-pressure pipe (5), and the other end is connected to a mixing device, the tail end of the mixing device is connected to the inlet of the centrifugal pump (1), the mixing device is a mixer (7) installed in the mixing device pipeline near the injection jet (8) and a flow stabilizer (9) installed in the mixing device pipeline near the centrifugal pump (1), the injection jet (8) is a double-cavity structure, and a plurality of rotating nozzles (82) are provided on the side wall of the outer ring cavity (81), and the direction of the rotating nozzle (82) is 90 degrees to the direction of the high-pressure liquid injected into the outer ring cavity (81), The ejection direction of the high-pressure liquid ejected from the rotating nozzle (82) is turned 90 degrees, and the ejection direction of the high-pressure liquid is changed to be parallel to the inlet low-pressure pipe (5), that is, in the same direction as the low-pressure liquid entering through the inlet low-pressure pipe (5) at an angle of 0. A guide plate with a calculated angle is fixed at each rotating nozzle (82) position to adjust the ejection direction of the high-pressure liquid to spiral ejection. The high-pressure liquid flows into the outer ring cavity (81) of the injection jet (8) through the guide pipe (4), enters the inner ring cavity (83) through the rotating nozzle (82), and is mixed with the low-pressure liquid flowing into the inlet low-pressure pipe (5) through the mixer (7) to achieve a uniform mixing of high and low pressures to a stable pressure state. A guide partition, a diffuser plate or a directional balance hole is installed on the inner wall of the inner ring cavity (83) on the side close to the inlet low-pressure pipe (5).

2. The inlet boosting system according to claim 1, characterized in that: The mixer (7) is a guide baffle, a diffuser plate or a directional balancing hole.

3. The inlet boosting system according to claim 1, characterized in that: The flow stabilizer (9) is a flow stabilizing net with a plurality of through holes evenly distributed thereon or a flow stabilizing plate with a plurality of through holes opened on the outer side of the circumference.

4. The inlet boosting system according to any one of claims 1 to 3, characterized in that: A filter (12) or a solid-liquid separation device is installed at the connection between the outlet high-pressure pipe (2) and the throttle valve (3).

5. The inlet boosting system according to any one of claims 1 to 3, characterized in that: A directional heat exchanger (6) is installed on the outer side of the pipe wall of the mixing pressure device.

6. The inlet boosting system according to any one of claims 1 to 3, characterized in that: A front measuring instrument interface (10) is left at the inlet low-pressure pipe (5), and a rear measuring instrument interface (11) is left at the mixing pressure device pipeline.

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