Hydrate slurry cooling oil pump

Abstract

The present invention relates to a hydrate slurry cooling oil pump, which has a pump body, a suction chamber at the front end of the pump body, a discharge chamber at the rear end, and a spiral cooling pipe connected between the suction chamber and the discharge chamber; a cooling layer for initially cooling the high-temperature oil is installed on the left wall of the suction chamber, and an annular pipe for secondary cooling the high-temperature oil by inputting carbon dioxide hydrate slurry is tightly installed on the outside of the spiral cooling pipe, and a boosting chamber is provided on the right side of the suction chamber, and the volume of the boosting chamber is increased by the carbon dioxide decomposed from the carbon dioxide hydrate, which indirectly increases the pressure of the suction chamber, making it difficult for the oil to be gasified. The present invention combines cooling with pressurization, thereby effectively preventing the problem of evacuation or idling of the oil pump, and has many advantages in dealing with various problems of high-temperature oil transportation, such as good heat exchange performance, economy, environmental protection, and energy saving.

Description

Technical Field

[0001] The invention relates to the technical field of oil pipeline delivery pumps, in particular to a hydrate slurry cooling oil delivery pump. Background Art

[0002] As one of the important resources, petroleum is consumed in great quantities every year. In addition to continuous domestic exploitation, it is also necessary to import from abroad to meet the demand, so there are many oil refineries distributed in both inland oil fields and coastal areas. In refineries, it is often necessary to fractionate the oil products transported from upstream to obtain finished oil, but the temperature in the distillation tower is too high, and the finished oil products output from the distillation tower often vaporize due to the high temperature, or the oil contains incompletely separated water that is vaporized by high temperature. When such high-temperature oil products with vaporization are input into the centrifugal pump, the pump will be evacuated and run idle. Since the existing centrifugal pumps do not have the function of cooling the conveying fluid, an oil pump that uses carbon dioxide hydrate slurry for cooling is proposed. Carbon dioxide hydrate slurry is a low-temperature, environmentally friendly two-phase fluid that can perform more thorough heat exchange under the condition of maintaining effective fluidity by adding corresponding reagents. Summary of the invention

[0003] The technical problem to be solved by the present invention is: in order to overcome the deficiencies in the prior art, the present invention provides a hydrate slurry cooling oil transfer pump to solve the problem of centrifugal pump idling and vacuuming caused by oil gasification or unseparated water vaporization due to excessive temperature after oil distillation.

[0004] The technical solution adopted by the present invention to solve the technical problem is: a hydrate slurry cooling oil delivery pump, comprising a pump body, wherein the front end of the pump body has a suction chamber, the rear end of the pump body has a discharge chamber, the suction chamber is provided with a suction impeller, the discharge chamber is provided with a discharge impeller, and a spiral cooling pipe is connected between the suction chamber and the discharge chamber;

[0005] The spiral cooling tube is tightly mounted with an annular tube for inputting carbon dioxide hydrate slurry outside, a cooling layer is mounted on the left wall of the suction chamber, a boost chamber is mounted on the right side of the suction chamber, a sealed partition for movable change of the internal volume of the boost chamber is mounted between the boost chamber and the suction chamber, and a vent pipe for inputting or discharging carbon dioxide gas to the boost chamber is mounted on the side wall of the pump body;

[0006] A collecting chamber for collecting carbon dioxide gas decomposed in the annular tube is provided above the annular tube, and the collecting chamber is connected to the pipeline of the boosting chamber;

[0007] The pump body is provided with a generation chamber for generating carbon dioxide hydrate slurry, which is respectively connected to the cooling layer and the upper end pipeline of the annular tube to input carbon dioxide hydrate slurry, the lower end of the cooling layer is connected to a first discharge pipe passing through the side wall of the pump body, and the lower end of the annular tube is connected to a second discharge pipe passing through the side wall of the pump body.

[0008] Furthermore, a motor is installed outside the rear end of the pump body, and the motor output shaft is drivingly connected to a rotating shaft, the rotating shaft traverses the discharge chamber and the suction chamber, and the discharge impeller and the suction impeller are respectively installed on the rotating shaft.

[0009] Specifically, sensor bases are respectively installed on the upper and lower inner walls of the pump body, a track is installed on the sensor base, rollers that roll with the track are respectively installed on the upper and lower ends of the closed partition, magnets are respectively fixed on the upper and lower ends of the inner side of the closed partition, and driving electromagnets corresponding to the magnets are respectively fixed on the upper and lower inner walls of the pump body in the booster chamber.

[0010] In order to timely feedback the position of the sealed partition, ten groups of optical sensors are installed on the sensor base, which send signals to the external computer in real time through the light shielding generated by the movement of the roller to feedback the position of the sealed partition.

[0011] The outside of the collecting chamber is provided with three emergency discharge ports in parallel, which are used to discharge carbon dioxide into the pump body to extinguish the fire when a fire occurs inside the pump body.

[0012] Preferably, the connection between the head end of the spiral cooling tube and the suction chamber, and the connection between the tail end and the discharge chamber are eccentric to the central axis of the spiral cooling tube.

[0013] The beneficial effects of the present invention are as follows: the present invention cools the high-temperature oil twice in the pump body by arranging a cooling layer filled with carbon dioxide hydrate slurry inside the suction chamber of the pump body and connecting the suction chamber to a spiral cooling tube with low-temperature carbon dioxide hydrate slurry attached to the outside for heat exchange and cooling; in addition, a boosting chamber is set up on the side wall of the suction chamber of the pump body. Since the total volume of the suction chamber and the boosting chamber is constant, the volume of the boosting chamber is increased by utilizing the carbon dioxide decomposed from the carbon dioxide hydrate, thereby indirectly increasing the pressure in the suction chamber and making it difficult for the oil to be gasified. Thus, the problem of evacuation or idling of the oil pump is prevented by combining cooling and pressurization. In dealing with various problems of high-temperature oil transportation, the present invention has many advantages such as good heat exchange performance, economy, environmental protection, and energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0015] Figure 1 It is a side cross-sectional structural schematic diagram of the present invention.

[0016] Figure 2 It is a schematic diagram of the front cross-sectional structure of the suction chamber of the present invention.

[0017] Figure 3 It is a rear cross-sectional structural schematic diagram of the present invention.

[0018] In the figure: 1. pump body, 2. fixing bolts, 3. cooling layer, 4. suction chamber, 5. first slurry pipe, 6. suction impeller, 7. second slurry pipe, 8. annular pipe, 9. input pipe, 10. input pipe valve, 11. emergency discharge port, 12. collecting chamber, 13. pressure sensor, 14. spiral cooling pipe, 15. collecting pipe, 16. second connecting seat, 17. discharge impeller, 18. discharge chamber, 19. rotating shaft, 20. motor, 21. first discharge pipe, 22. first connecting seat, 23. sensor base, 24. heat-resistant sealed belt, 25. roller, 26. track, 27. driving electromagnet, 28. boost chamber, 29. ventilation pipe, 30. magnet, 31. sealed partition, 32. generation chamber, 33. second discharge pipe, 34. exhaust valve. DETAILED DESCRIPTION

[0019] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0020] like Figure 1 to Figure 3 A hydrate slurry cooling oil delivery pump is shown, comprising a pump body 1, wherein a high-temperature oil delivery system, a cooling system and a pressurizing system are arranged in the pump body 1.

[0021] The conveying system includes a suction chamber 4 located at the front end of the pump body 1 and a discharge chamber 18 located at the rear end of the pump body 1. A suction impeller 6 is provided in the suction chamber 4, and a discharge impeller 17 is provided in the discharge chamber 18. A motor 20 is installed outside the rear end of the pump body, and a rotating shaft 19 is connected to the motor output shaft.

[0022] A spiral cooling tube 14 is tightly connected between the suction chamber 4 and the discharge chamber 18. A first connecting seat 22 fixed to the rear wall of the suction chamber 4 is welded to the front end of the spiral cooling tube 14, and a second connecting seat 16 fixed to the front wall of the discharge chamber 18 is welded to the rear end of the spiral cooling tube 14 to facilitate the disassembly and replacement of the spiral cooling tube 14. Sealing rings are installed inside the connections at the front and rear ends of the spiral cooling tube 14. Preferably, the connections between the head end of the spiral cooling tube 14 and the suction chamber 4 and the tail end of the spiral cooling tube 14 and the discharge chamber 18 are eccentric to the central axis of the spiral cooling tube 14 itself.

[0023] The high-temperature oil delivery system is the main structure of the cooling oil pump. The rotating shaft 19 connected to the motor 20 penetrates into the pump body 1 from the rear wall of the discharge chamber 18, extends through the front wall of the discharge chamber 18, and penetrates into the rear wall of the suction chamber 4 along the central axis of the spiral cooling tube 14. The discharge impeller 17 and the suction impeller 6 are respectively installed on the rotating shaft 19. The penetration point of the above-mentioned rotating shaft 19 is circumferentially installed with high-temperature resistant sealing rings to prevent leakage of high-temperature oil; the part of the rotating shaft 19 exposed to the high-temperature oil is wrapped with a thermal insulation protective layer; the suction impeller 6 and the discharge impeller 17 both adopt closed impellers.

[0024] The cooling system includes a generation chamber 32 arranged outside the pump body 1 for generating carbon dioxide hydrate slurry. The cooling system is divided into two parts. The main body of the first part is a cooling layer 3 made of carbon fiber composite material in the suction chamber 4. The cooling layer 3 is laid flat on the left wall of the suction chamber 4, and ten groups of holes are left thereon. The cooling layer 3 is fixed to the left wall of the suction chamber 4 by using ten groups of fixing bolts 2 and sealing rings.

[0025] The pipe part at the upper end of the cooling layer 3 passes through the upper end of the left wall of the suction chamber 4 and extends outside the pump body 1. It is connected to the first slurry pipe 5 through a connecting flange. The first slurry pipe 5 is connected to the generation chamber 32. A part of the carbon dioxide hydrate slurry in the generation chamber 32 is input into the cooling layer 3 through the first slurry pipe 5 to perform preliminary cooling for the high-temperature fluid entering the suction chamber 4; the pipe part at the lower end of the cooling layer 3 passes through the lower end of the left wall of the suction chamber 4 and extends outside the pump body 1, and is connected to the first discharge pipe 21 through a connecting flange to discharge the carbon dioxide and water decomposed in the cooling layer 3 outside the pump body 1 for recycling.

[0026] The second main body of the cooling system is an annular tube 8 tightly wrapped around the outside of the spiral cooling tube 14. The annular tube 8 is a hollow cylindrical pipe made of carbon fiber composite material. The bottom of the annular tube 8 is in close contact with the bottom wall of the pump body 1. The top pipe section at the front end of the annular tube 8 extends through the right wall of the pump body 1 and is connected to the second slurry pipe 7 through a connecting flange. The second slurry pipe 7 is connected to the generation chamber 32. Another part of the carbon dioxide hydrate slurry in the generation chamber 32 is input into the annular tube 8 through the second slurry pipe 7, so as to perform secondary cooling for the high-temperature oil in the spiral cooling tube 14 and further reduce the temperature of the oil. The end pipe section of the annular tube 8 passes through the right wall of the pump body 1 and is connected to the second discharge pipe 33 through a connecting flange. The second discharge pipe 33 is installed side by side with the first discharge pipe 21. The second discharge pipe 33 discharges the water generated by the decomposition in the annular tube 8 to the outside of the pump body 1 for recycling.

[0027] The boosting system includes a collecting pipe 15, a collecting chamber 12, a boosting chamber 28 and several components therein. The boosting chamber 28 is located on the right side of the suction chamber 4. A closed partition 31 that can be moved to change the internal volume of the boosting chamber 28 is provided between the boosting chamber 28 and the suction chamber 4. A ventilation pipe 29 for inputting or discharging carbon dioxide gas to the boosting chamber 28 is installed on the side wall of the pump body 1.

[0028] During the secondary cooling process, the carbon dioxide hydrate slurry that exchanges heat in the annular tube 8 is heated and decomposed into carbon dioxide and water. The carbon dioxide enters the collecting chamber 12 through the three collecting pipes 15 welded on the top of the annular tube 8. A pressure sensor 13 is installed on the collecting chamber 12 to provide real-time feedback of the pressure in the collecting chamber 12 to an external computer. The collecting chamber 12 plays a buffering role in the boosting system.

[0029] The upper and lower inner walls of the pump body 1 are respectively provided with a sensor base 23 , a track 26 is installed on the sensor base 23 , and rollers 25 rollingly matched with the track 26 are respectively installed on the upper and lower ends of the sealed partition 31 .

[0030] Three emergency discharge ports 11 are installed on the side of the collecting chamber 12 . When a fire occurs inside the pump body 1 , the emergency discharge ports 11 pop open to discharge the carbon dioxide in the collecting chamber 12 , thereby suffocating the fire inside the pump body 1 .

[0031] The front end of the collecting chamber 12 is connected to an input pipe 9, and an external computer controls the input pipe valve 10 to open, so as to quantitatively transport the carbon dioxide gas in the collecting chamber 12 into the boosting chamber 28 through the input pipe 9; when the space in the boosting chamber 28 is insufficient to accommodate the increasing carbon dioxide gas, the excess gas will push the sealed partition 31 to slide on the track 26 on the sensor base 23 using the roller 25, thereby increasing the volume of the boosting chamber 28 and reducing the volume of the suction chamber 4, thereby indirectly increasing the gas pressure in the suction chamber 4, and its function is to form a synergistic effect with the cooling system to further reduce the gasification of the high-temperature oil in the suction chamber 4.

[0032] Ten groups of optical sensors are installed on the sensor base 23 located in the boost chamber 28, which use the light shielding generated by the movement of the rollers 25 at the upper and lower ends of the sealed partition 31 to send signals to the external computer in real time to feedback the position of the sealed partition 31. When the sealed partition 31 reaches the limit position or provides sufficient pressure for the suction chamber 4, the exhaust valve 34 installed on the ventilation pipe 29 is opened to discharge excess carbon dioxide and circulate the carbon dioxide in the system.

[0033] In order to prevent high-temperature oil from leaking from the roller 25, a stretchable heat-resistant sealing belt 24 made of polyphenylene sulfide is connected to the upper end of the notch of the sealed partition 31. When the sealed partition 31 is under pressure and is in the extreme position, the heat-resistant sealing belt 24 is in a relaxed state, and before the sealed partition 31 moves, the heat-resistant sealing belt 24 is in a tight state.

[0034] Two sets of corresponding matching magnets 30 and driving electromagnets 27 are also installed at the upper and lower ends of the boost chamber 28 and the sealed partition 31, wherein the magnets 30 are fixed at the upper and lower ends of the inner side of the sealed partition 31, and the driving electromagnets 27 are installed on the upper and lower inner walls of the pump body 1 in the boost chamber 28, respectively corresponding to the magnets 30. When there is insufficient gas in the boost chamber 28 or the suction chamber 4 needs more space, the position of the sealed partition 31 is changed in time by controlling the forward and reverse power supply and current size of the electromagnet 27. When the quantitative input of carbon dioxide fails, the system can play an emergency control effect.

[0035] The vent pipe 29 is welded to the side wall of the pump body 1 at the lower end of the boosting chamber 28. When the oil pump just starts to work, a certain amount of carbon dioxide gas is first filled into the boosting chamber 28, so that the boosting chamber 28 has the ability to increase pressure in the initial stage of the oil pump's operation, and at the same time, the excess carbon dioxide is discharged after the oil pump has been working for a period of time.

[0036] The working process of the oil pump is briefly described as follows:

[0037] Before work, sufficient carbon dioxide gas is injected into the boost chamber 28 through the ventilation pipe 29 to put the sealed partition 31 in a critical motion state. The high-temperature oil processed by the upstream equipment enters the suction chamber 4, and the high-temperature oil is initially cooled by the carbon dioxide hydrate slurry in the cooling layer 3 in the suction chamber 4. At the same time, the suction impeller 6 in the suction chamber 4 provides initial energy for the high-temperature oil of the oil pump, forcing the high-temperature oil to enter the spiral cooling pipe 14. The carbon dioxide hydrate slurry in the generation chamber 32 enters the annular pipe 8 through the second slurry pipe 7 to perform secondary cooling on the high-temperature oil in the spiral cooling pipe 14. At the same time, the carbon dioxide gas decomposed in the annular pipe 8 is collected into the collection chamber 12, and then quantitatively transported into the boost chamber 28, increasing the volume of the boost chamber 28 and indirectly increasing the pressure in the suction chamber 4.

[0038] The oil product that has been cooled twice enters the discharge chamber 18, and the motor 20 drives the discharge impeller 17 to provide sufficient energy for the oil product and transport it out of the pump body. At the same time, the generation chamber 32 in the low temperature environment uses its internal stirring system and the added promoter to generate carbon dioxide hydrate slurry, which is continuously transported into the first slurry pipe 5 and the second slurry pipe 7.

[0039] The carbon dioxide and water decomposed in the cooling layer 3 are directly discharged through the first discharge pipe 21, the water decomposed in the annular pipe 8 is discharged through the second discharge pipe 33, and the decomposed carbon dioxide enters the collection chamber 12. If the sealed partition 31 in the boost chamber 28 reaches the limit position and the carbon dioxide gas storage amount in the collection chamber 12 reaches the limit, the input pipe valve 10 and the exhaust valve 34 are opened at the same time to keep the carbon dioxide in the pump body 1 in a circulating state.

[0040] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A hydrate slurry cooling oil pump, having a pump body, characterized by: The pump body has a suction chamber at the front end and a discharge chamber at the rear end. The suction chamber is provided with a suction impeller, the discharge chamber is provided with a discharge impeller, and a spiral cooling pipe is connected between the suction chamber and the discharge chamber. The spiral cooling tube is tightly mounted with an annular tube for inputting carbon dioxide hydrate slurry outside, a cooling layer is mounted on the left wall of the suction chamber, a boost chamber is mounted on the right side of the suction chamber, a sealed partition for movable change of the internal volume of the boost chamber is mounted between the boost chamber and the suction chamber, and a vent pipe for inputting or discharging carbon dioxide gas to the boost chamber is mounted on the side wall of the pump body; A collecting chamber for collecting carbon dioxide gas decomposed in the annular tube is provided above the annular tube, and the collecting chamber is connected to the pipeline of the boosting chamber; The pump body is provided with a generation chamber for generating carbon dioxide hydrate slurry, which is respectively connected to the cooling layer and the upper end pipeline of the annular tube to input carbon dioxide hydrate slurry, the lower end of the cooling layer is connected to a first discharge pipe passing through the side wall of the pump body, and the lower end of the annular tube is connected to a second discharge pipe passing through the side wall of the pump body.

2. The hydrate slurry cooling oil transfer pump according to claim 1, characterized in that: A motor is installed outside the rear end of the pump body, and the motor output shaft is drivingly connected with a rotating shaft. The rotating shaft crosses the discharge chamber and the suction chamber, and the discharge impeller and the suction impeller are respectively installed on the rotating shaft.

3. The hydrate slurry cooling oil transfer pump according to claim 1, characterized in that: Sensor bases are respectively installed on the upper and lower inner walls of the pump body, and a track is installed on the sensor base. Rollers that roll with the track are respectively installed on the upper and lower ends of the closed partition, and magnets are respectively fixed on the upper and lower ends of the inner side of the closed partition. Driving electromagnets corresponding to the magnets are respectively fixed on the upper and lower inner walls of the pump body in the booster chamber.

4. The hydrate slurry cooling oil transfer pump according to claim 3, characterized in that: The sensor base is equipped with ten groups of optical sensors which send signals to an external computer in real time through the light shielding generated by the movement of the roller to feedback the position of the closed partition.

5. The hydrate slurry cooling oil transfer pump according to claim 1, characterized in that: The outside of the collecting chamber is provided with three emergency discharge ports in parallel for discharging carbon dioxide to extinguish the fire when a fire occurs inside the pump body.

6. The hydrate slurry cooling oil transfer pump according to claim 1, characterized in that: The connection between the head end of the spiral cooling tube and the suction chamber and the tail end and the discharge chamber is eccentric to the central axis of the spiral cooling tube.

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