One-stage hydrogenation feed pump for environment-friendly aromatic oil and paraffin co-production device

Abstract

The utility model relates to the technical field of hydrogenation feed pumps, in particular to a one-stage hydrogenation feed pump for an environment-friendly aromatic oil and paraffin co-production device. Comprising a first-stage impeller, a barrel, a pump cover, a pump shaft, a pump rotor, a suction inlet, a discharge outlet, a second-stage impeller, a guide vane, a last-stage guide vane, a guide vane sealing ring, a middle section sealing ring, a suction box sealing ring, a first-stage impeller sealing ring, a hub sealing ring, an impeller sealing ring, a balance disc, a balance sleeve pressing plate, a balance sleeve, a steel plate, a first winding gasket, a discharge side sealing box and a second winding gasket. A first-stage impeller, a second-stage impeller, a third winding gasket, a first O-shaped ring, a second O-shaped ring and a suction box body are arranged on a pump shaft, the first-stage impeller and the second-stage impeller are positioned on the pump shaft stage by stage in a hot charging mode, a guide vane and a last-stage guide vane are positioned through a guide vane anti-rotating pin, and the first winding gasket, the second winding gasket and the third winding gasket which can be compressed are assembled between the last-stage guide vane and a pump cover. The device is convenient to install, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogenation feed pumps, in particular to a one-stage hydrogenation feed pump for an environmentally friendly aromatic oil and co-production paraffin device. Background Art

[0002] Hydrogenation feed pumps are mostly vane-type multi-stage centrifugal pumps. When the hydrogenation feed pump is working, it sucks in the fluid medium from the suction port, pressurizes the fluid medium through the first-stage impeller, the middle-stage impeller and the final-stage impeller, and throws the fluid medium out from the discharge port. The main purpose and scope of application: the pump for raw material feed in the hydrorefining and hydrocracking units of the refinery. The market now has higher and higher requirements for oil quality, and the processing volume of the unit can no longer meet the needs of overall balance. The investment cost of the new hydrogenation unit is high and the cycle is long. One of the main "bottlenecks" restricting the processing volume of the unit is the hydrogenation feed pump. The original pump can no longer meet the process requirements. Therefore, it is proposed to use a first-stage hydrogenation feed pump for environmentally friendly aromatic oil and co-production paraffin units to meet the process requirements. Utility Model Content

[0003] In view of the problems in the prior art, the utility model provides a one-stage hydrogenation feed pump for an environmentally friendly aromatic oil and co-production paraffin device.

[0004] The utility model solves the technical problem by adopting a technical solution that is a one-stage hydrogenation feed pump for an environmentally friendly aromatic oil and co-production paraffin device, comprising a first-stage impeller, a cylinder, a pump cover, a pump shaft, a pump rotor, a suction port, a discharge port, a secondary impeller, a guide vane, a final guide vane, a guide vane sealing ring, a middle section sealing ring, a suction box body sealing ring, a first-stage impeller sealing ring, a hub sealing ring, an impeller sealing ring, a balancing disc, a balancing sleeve pressure plate, a balancing sleeve, a steel plate, a first winding pad, a discharge side sealing box body, a second winding pad, a third winding pad, a first O-ring, a second O-ring, and a suction box body. The first-stage impeller and the secondary impeller are both It is positioned on the pump shaft step by step by means of heat-fitting, the guide vanes and the last-stage guide vanes are positioned by means of the guide vane anti-rotation pins, a compressible first winding pad, a second winding pad and a third winding pad are assembled between the last-stage guide vanes and the pump cover, a balancing mechanism formed by the balancing disc, the balancing sleeve pressure plate and the balancing sleeve bears the main axial force, mechanical seals are arranged at both ends of the balancing disc, the inlet and the outlet are both located at the top of the cylinder, the pump core package is penetrated by the non-driving end, the driving end is connected to the gear box, the gear box is connected to the motor, both ends of the pump shaft are supported by sliding bearings, and part of the residual axial force is balanced by the thrust bearing.

[0005] By adopting the above technical scheme, the flow rate of the original hydrogenation feed pump was increased, the head of the hydrogenation feed pump was improved, and a new impeller hydraulic model was developed. The guide vanes matched with it met the basic performance requirements of the system for the pump after modification. Compressible first winding pads, second winding pads, and third winding pads were provided between the pump cover and the last-stage guide vanes to prevent axial stringing caused by thermal expansion of the rotor, thereby meeting the needs of 600,000 tons / year of environmentally friendly aromatic oil and 200,000 tons / year of paraffin wax co-production units.

[0006] Specifically, the stop portions of the inner wall of the cylinder in contact with the medium are all welded with a 316L welding layer, the thickness of which is at least 3 mm.

[0007] By adopting the above technical solution, the stoppers of the cylinder body in contact with the medium are all welded with a 316L layer with a thickness of at least 3mm to increase the corrosion resistance and ensure its service life.

[0008] Specifically, the suction port and the discharge port are parallel to each other and located on the same horizontal plane.

[0009] By adopting the above technical solution, the suction port and the discharge port are parallel to each other and are located on the same horizontal plane, which can meet the special requirements of installation.

[0010] Specifically, the first-stage impeller and the secondary impeller are both centrifugal single-suction impellers.

[0011] By adopting the above technical solution, the first-stage impeller and the secondary impeller are both centrifugal single-suction impellers, which can balance the axial force.

[0012] Specifically, the mechanical seal adopts a PLAN32+PLAN53B flushing type mechanical seal.

[0013] By adopting the above technical solution, the mechanical seal adopts PLAN32+PLAN53B flushing mechanical seal, which ensures the safety and reliability of the pump during use.

[0014] Beneficial effects of the utility model:

[0015] (1) The environmentally friendly aromatic oil and co-production paraffin unit described in the utility model uses a one-stage hydrogenation feed pump, which increases the flow rate of the original hydrogenation feed pump and improves the head height of the hydrogenation feed pump. A new impeller hydraulic model and a guide vane matched therewith are developed to meet the basic performance requirements of the system after the pump is modified. A compressible first winding pad, a second winding pad, and a third winding pad are provided between the pump cover and the last-stage guide vane to prevent axial stringing caused by thermal expansion of the rotor, thereby meeting the needs of a 600,000 tons / year environmentally friendly aromatic oil and a 200,000 tons / year co-production paraffin unit.

[0016] (2) The environmentally friendly aromatic oil and co-production paraffin unit described in the utility model uses a one-stage hydrogenation feed pump. The stopper where the barrel contacts the medium is welded with a 316L weld layer with a thickness of at least 3 mm to increase corrosion resistance and ensure its service life. The first-stage impeller and the secondary impeller are both centrifugal single-suction impellers that can balance the axial force. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 It is a structural schematic diagram of the utility model.

[0019] In the figure: 1. first-stage impeller; 2. secondary impeller; 3. guide vane; 4. final-stage guide vane; 5. guide vane sealing ring; 6. middle-section sealing ring; 7. suction box sealing ring; 8. first-stage impeller sealing ring; 9. hub sealing ring; 10. impeller sealing ring; 11. balance disc; 12. balance sleeve pressure plate; 13. balance sleeve; 14. steel plate; 15. first winding pad; 16. second winding pad; 17. discharge side sealing box; 18. third winding pad; 19. first O-ring; 20. second O-ring; 21. suction box. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0021] In order to meet the process requirements, as an embodiment of the utility model, Figure 1As shown, the one-stage hydrogenation feed pump for the environmentally friendly aromatic oil and co-production paraffin device described in the utility model includes a first-stage impeller 1, a cylinder, a pump cover, a pump shaft, a pump rotor, a suction port, a discharge port, a secondary impeller 2, a guide vane 3, a final guide vane 4, a guide vane sealing ring 5, a middle section sealing ring 6, a suction box body sealing ring 7, a first-stage impeller sealing ring 8, a hub sealing ring 9, an impeller sealing ring 10, a balancing disc 11, a balancing sleeve pressure plate 12, a balancing sleeve 13, a steel plate 14, a first winding pad 15, a discharge side sealing box body 17, a second winding pad 16, a third winding pad 18, a first O-ring 19, a second O-ring 20, and a suction box body 21. The first-stage impeller 1, the secondary impeller The wheels 2 are positioned on the pump shaft step by step by means of heat-fitting. The guide vanes 3 and the last-stage guide vanes 4 are positioned by means of guide vane anti-rotation pins. A compressible first winding pad 15, a second winding pad 16 and a third winding pad 18 are assembled between the last-stage guide vanes 4 and the pump cover. The balancing mechanism formed by the balancing disc 11, the balancing sleeve pressure plate 12 and the balancing sleeve 13 bears the main axial force. Mechanical seals are provided at both ends of the balancing disc 11. The inlet and the outlet are both located at the top of the cylinder. The pump core package is inserted from the non-driving end, and the driving end is connected to the gear box, which is connected to the motor. Both ends of the pump shaft are supported by sliding bearings, and part of the residual axial force is balanced by thrust bearings.

[0022] When in use, the flow rate of the original hydrogenation feed pump is increased, the head height of the hydrogenation feed pump is improved, a new impeller hydraulic model is developed, and the guide vanes 3 and the last-stage guide vanes 4 matched therewith meet the basic performance requirements of the system for the pump after transformation. A compressible first winding pad 15, a second winding pad 16, and a third winding pad 18 are arranged between the pump cover and the last-stage guide vane 4 to prevent axial stringing caused by thermal expansion of the rotor, thereby meeting the needs of 600,000 tons / year of environmentally friendly aromatic oil and 200,000 tons / year of co-production of paraffin units.

[0023] In order to improve the anti-corrosion ability, the stoppers of the inner wall of the cylinder in contact with the medium are all welded with a 316L welding layer with a thickness of at least 3mm.

[0024] When in use, the stoppers of the cylinder that come into contact with the medium are all welded with a 316L layer with a thickness of at least 3mm to increase corrosion resistance and ensure its service life.

[0025] In order to meet the installation requirements, the suction port and the discharge port are parallel to each other and are located on the same horizontal plane.

[0026] In order to balance the axial force, the primary impeller 1 and the secondary impeller 2 are both centrifugal single-suction impellers.

[0027] In order to improve the sealing performance and safety, the mechanical seal adopts a PLAN32+PLAN53B flushing mechanical seal.

[0028] When the utility model is in use, the mechanical seal adopts PLAN32+PLAN53B flushing mechanical seal to ensure the safety and reliability of the pump during use. The first-stage impeller and the secondary impeller are both centrifugal single-suction impellers, which can balance the axial force. The stoppers where the cylinder body contacts the medium are all welded with a 316L weld layer with a thickness of at least 3mm to increase the corrosion resistance and ensure its service life. The flow rate of the original hydrogenation feed pump is increased, and the head height of the hydrogenation feed pump is improved. A new impeller hydraulic model is developed, and the guide vanes 3 and the last-stage guide vanes 4 matched therewith meet the basic performance requirements of the system after the transformation of the pump. A compressible first winding pad 15, a second winding pad 16, and a third winding pad 18 are arranged between the pump cover and the last-stage guide vane 4 to prevent the axial stringing phenomenon caused by the thermal expansion of the rotor, thereby meeting the needs of the 600,000 tons / year environmentally friendly aromatic oil and the co-production of 200,000 tons / year paraffin unit.

[0029] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and the description in the specification are only to illustrate the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, and these changes and improvements fall within the scope of protection claimed by the utility model. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents. The contents not described in detail in the utility model belong to the prior art known to those skilled in the art.

Claims

1. A one-stage hydrogenation feed pump for environmentally friendly aromatic oil and co-production paraffin units, characterized in that: The pump comprises a first-stage impeller (1), a cylinder, a pump cover, a pump shaft, a pump rotor, a suction port, a discharge port, an inlet, an outlet, a secondary impeller (2), a guide vane (3), a final-stage guide vane (4), a guide vane sealing ring (5), a middle section sealing ring (6), a suction box body sealing ring (7), a first-stage impeller sealing ring (8), a hub sealing ring (9), an impeller sealing ring (10), a balancing disc (11), a balancing sleeve pressure plate (12), a balancing sleeve (13), a steel plate (14), a first winding pad (15), a discharge side sealing box body (17), a second winding pad (16), a third winding pad (18), a first O-ring (19), a second O-ring (20), and a suction box body (21). The first-stage impeller (1), the secondary impeller ( 2) are positioned step by step on the pump shaft by means of heat-fitting, the guide vane (3) and the last-stage guide vane (4) are positioned by means of a guide vane anti-rotation pin, a compressible first winding pad (15), a second winding pad (16) and a third winding pad (18) are installed between the last-stage guide vane (4) and the pump cover, a balancing mechanism formed by the balancing disc (11), the balancing sleeve pressure plate (12) and the balancing sleeve (13) bears the main axial force, both ends of the balancing disc (11) are provided with mechanical seals, the inlet and the outlet are both located at the top of the cylinder, the pump core package is inserted from the non-driving end, the driving end is connected to the gear box, the gear box is connected to the motor, both ends of the pump shaft are supported by sliding bearings, and part of the residual axial force is balanced by the thrust bearing.

2. The one-stage hydrogenation feed pump for the environmentally friendly aromatic oil and co-production paraffin device according to claim 1, characterized in that: The stop portions of the inner wall of the cylinder in contact with the medium are all welded with a 316L welding layer, the thickness of which is at least 3 mm.

3. The one-stage hydrogenation feed pump for the environmentally friendly aromatic oil and co-production paraffin unit according to claim 1, characterized in that: The suction port and the discharge port are parallel to each other and are located on the same horizontal plane.

4. The one-stage hydrogenation feed pump for the environmentally friendly aromatic oil and co-production paraffin unit according to claim 1, characterized in that: The first-stage impeller (1) and the secondary impeller (2) are both centrifugal single-suction impellers.

5. The one-stage hydrogenation feed pump for the environmentally friendly aromatic oil and co-production paraffin unit according to claim 1, characterized in that: The mechanical seal adopts a PLAN32+PLAN53B flushing type mechanical seal.

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