Centrifugal ore pulp preheater feeding pump and feeding pump system

Abstract

The invention discloses a centrifugal ore pulp preheater feeding pump and a feeding pump system.The centrifugal ore pulp preheater feeding pump comprises a driving unit, a centrifugal unit and a sealing and cooling unit, the centrifugal unit comprises an impeller and a wheel cover structure, and the impeller is rotationally arranged in the wheel cover structure; a plurality of medium channels are formed in the impeller cover structure through a plurality of blades of the impeller, one side of the impeller is connected with a driving unit, the other side of the impeller is provided with a feeding port communicated with the impeller cover structure and an opening communicated with one end of each medium channel, and the feeding port of the impeller cover structure is sequentially provided with first protrusions in the circumferential direction. A pump cavity communicated with the other end of the medium channel is further formed in the pump body. The multi-system combined action is adopted, and stable, continuous and leakage-free safe conveying of high-temperature and high-pressure solid, liquid and gas three-phase flow ore pulp media is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of slurry medium transportation, and in particular to a centrifugal slurry preheater feed pump and a feed pump system. Background Art

[0002] High-temperature and high-pressure slurry preheater is a device used to store and heat high-pressure slurry. The slurry is mostly a three-phase mixed slurry of solid, liquid and gas. The solid content is generally 35% to 40%, and the rest is steam and acid solution. The pH is between 2 and 4. The preheater is mostly a sealed cylindrical tank with pressure inside. As the slurry temperature rises from 105℃ to 165℃, the pressure inside the tank rises from 0.8MPa to 2.2MPa.

[0003] At present, high-temperature and high-pressure slurry preheater feed pumps mostly use high-pressure diaphragm pumps, which are positive displacement pumps. Chinese patent CN105201847A discloses a diaphragm oil-free vacuum pump, which uses the principle of eccentric mechanism to realize the suction and discharge function of the pump, and is composed of a stator chamber, a pump chamber and a rotor that runs through the inner cavity of the above two chambers; a stator with an eccentric hole is fixed in the stator chamber; the pump chamber is fixed on the stator chamber and coaxial with it, and a tongue sleeve is fixed in the inner cavity of the pump chamber, and there is a pair of tongues on the tongue sleeve that separate the high-pressure area and the low-pressure area in the pump chamber; the rotor has a C-shaped channel; a plunger is installed in the radial through hole corresponding to the stator, and the inner end of the plunger is covered with an elastic diaphragm sleeve to absolutely isolate the lubricating oil in the stator chamber from the gas in the pump chamber.

[0004] Its working principle is to rely on the back-and-forth agitation of a diaphragm to change the volume of the working chamber to inhale and discharge the liquid, but it has the following disadvantages: the reciprocating motion of the pump will bring impact to the preheater and pipeline valves, and the medium delivery is discontinuous. In addition, its working part is mainly composed of a crank-connecting rod mechanism, a plunger, a cylinder, a diaphragm, a pump body, a suction valve and a discharge valve, which leads to its large size, many parts and complex systems with many failure points. Especially when conveying media containing solid particles, the harder particles will cause serious wear on the suction valve, valve seat, valve cone and the discharge valve, valve seat, valve cone, resulting in defects such as pressure relief and insufficient flow. Summary of the invention

[0005] The purpose of this application is to overcome the above technical deficiencies and propose a centrifugal slurry preheater feed pump and feed pump system to solve the technical problems of severe pump wear, pressure relief and insufficient flow when conveying a medium containing solid particles in the prior art.

[0006] In order to achieve the above technical objectives, this application adopts the following technical solutions: In the first aspect, the present application provides a centrifugal slurry preheater feed pump, comprising: a drive unit, a centrifugal unit and a sealed cooling unit, the centrifugal unit comprising an impeller and a wheel cover structure, the impeller being rotatably arranged inside the wheel cover structure, a plurality of medium channels being formed in the wheel cover structure through a plurality of blades of the impeller, one side of the impeller being connected to the drive unit, and the other side being provided with an opening respectively connected to a feed port of the wheel cover structure and one end of the medium channel, the feed port of the wheel cover structure being sequentially provided with first protrusions along the circumferential direction, and a pump cavity connected to the other end of the medium channel is also formed therein; the sealed cooling unit comprising a sealing system and a sealing body arranged between a rotor and a stator, a sealed cavity connected to an isolation liquid outlet of the sealing system being formed between friction surfaces inside the sealing body, to ensure that there is no leakage of the medium when the centrifugal pump is in operation.

[0007] In some embodiments, a second protrusion is provided on the side of the impeller facing away from the feed port of the wheel cover structure, a cavity is provided inside the second protrusion, an inner wall of the cavity is threaded, and is connected to the driving unit through the thread, and five blades that are bent and extended outward are provided in sequence along the circumferential direction on the outer side of the impeller.

[0008] In some embodiments, the wheel cover structure includes a volute, a guard plate and a pump cover, one end of the volute forms an annular feed portion, the first protrusion is arranged on the inner side of the annular feed portion, and the other end of the volute surrounds the impeller and is sequentially connected to the guard plate and the pump cover, so that the impeller is in the pump chamber formed by the volute, the guard plate and the pump cover. The connection between the volute and the guard plate is sealed by a C-shaped ring, and the C-shaped ring is sequentially arranged along the connection between the volute and the guard plate. The two protrusions of the C-shaped ring are respectively connected to the volute and the guard plate, and a plurality of fixing ribs are evenly distributed along the circumferential direction on the side of the C-shaped ring away from the volute, thereby ensuring the sealing and strength of the seal.

[0009] In some embodiments, the sealing system includes a heat exchanger, a forced circulation pump, an accumulator and a fluid replenishment station. The liquid inlet end of the heat exchanger is connected to the liquid discharge port of the sealed cavity through the accumulator, and its liquid discharge end is connected to the liquid inlet of the sealed cavity through the forced circulation pump. The liquid supply end of the fluid replenishment station is connected to the heat exchanger.

[0010] In some embodiments, the centrifugal slurry preheater feed pump further includes a link unit, wherein the link unit connects a driving end of the driving unit and the impeller to transmit a rotational torque.

[0011] In some embodiments, the centrifugal slurry preheater feed pump further includes a non-return transmission unit, the non-return transmission unit includes a transmission unit and a non-return unit, the transmission unit is connected to the driving end and the impeller of the driving unit, and the non-return unit is connected to the transmission unit to prevent the transmission unit from rotating in the opposite direction. The transmission unit includes a rotating shaft, one end of the rotating shaft is connected to the driving end of the driving unit through a link unit, and the other end of the rotating shaft is connected to the impeller; the non-return unit includes a bearing seat, a wedge block, a rotating pin, a spring, a bushing and a stop arm, the bushing is sleeved on the outer side of the rotating shaft, the bearing seat is sleeved on the outer side of the bushing, and an annular cavity is formed between the bushing, the outer side of the bearing seat is fixed to the base of the driving unit through the stop arm, and a plurality of rotating pins are evenly arranged in the annular cavity along the circumferential direction, the rotating pin is rotatably connected to the bearing seat, the spring is installed between two adjacent rotating pins, and the wedge block is sleeved on each rotating pin, and the two ends of the wedge block respectively abut the outer surface of the bearing seat and the inner surface of the bushing to tightly lock the rotating shaft when the rotating shaft reverses.

[0012] Preferably, the backstop transmission unit is used to prevent the slurry in the pressurized preheater from returning from the pump outlet to the inlet through the pipeline to damage the rotor components when the centrifugal pump stops working under abnormal circumstances. The principle of the backstop is similar to that of a ratchet, which can only rotate in one direction and will get stuck when rotating in the opposite direction, thereby playing a backstop role.

[0013] In some embodiments, the centrifugal slurry preheater feed pump also includes an adjustable support, which includes a support traction plate, an adjustment screw, a slider, a baffle, a slide plate and an anchor bolt. The support traction plate and the baffle are fixedly connected to the base of the drive unit, the slide plate is fixed to the bottom end of the baffle, the anchor bolt is movably connected to the slide plate, the slider is sleeved on the anchor bolt, and the adjustment screw is extended along the axial direction of the drive unit, which is threadedly connected to the support traction plate, and one end is rotatably connected to the slide plate to adjust the slide plate to move in a direction parallel to the axis of the drive unit.

[0014] In a second aspect, the present application further provides a feed pump system, comprising a centrifugal slurry preheater feed pump as described in any one of the above items, wherein three centrifugal slurry preheater feed pumps are provided and the three centrifugal slurry preheater feed pumps are connected in sequence.

[0015] Compared with the prior art, the centrifugal slurry preheater feed pump and feed pump system provided by the present application are composed of three pumps running in series to form a feed pump system. The centrifugal slurry preheater feed pump is composed of a driving unit, a centrifugal unit and a sealed cooling unit. The driving unit is used to realize the rotation of the impeller. During the implementation process, the first-stage pump impeller rotates under the drive of the driving unit, and the negative pressure generated by the centrifugal force sucks the medium in the medium-temperature preheater into the feed port of the wheel cover structure. The centrifugal force generated by the rotation of the blades throws the medium into the pump cavity, gathers in the pump cavity, flows to the outlet of the wheel cover structure, and then enters the second-stage pump, and then Enter the third-stage pump until it is finally delivered to the high-temperature preheater. Each stage of the pump will increase the pressure of the fluid, and the final output pressure will be the sum of the pressures provided by each pump, so that each pump plays a role in increasing the fluid pressure to ensure that the fluid can pass through the entire system smoothly and can withstand the operating conditions under high temperature and high pressure environments, thereby achieving stable, continuous and leak-free safe delivery of high-temperature and high-pressure solid, liquid and gas three-phase flow slurry media; at the same time, a first protrusion is set at the feed inlet of the wheel cover structure to hinder the movement trajectory of solid particles, thereby reducing the wear of the solid medium on the pipe wall; By setting up a sealing cooling unit, a sealing cavity connected with the isolation fluid outlet of the sealing system is formed between the friction surfaces inside the sealing body, and the friction surfaces can be lubricated and cooled by the isolation fluid. The sealing system of the sealing cooling unit can increase the heat exchange capacity of the isolation fluid, ensuring that the rotor components and the stator components of the centrifugal pump operate without leakage during the transportation of high-temperature media. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structural unit of the centrifugal slurry preheater feed pump provided in an embodiment of the present application; Figure 2 It is a schematic diagram of the overall structure of a centrifugal slurry preheater feed pump provided in an embodiment of the present application; Figure 3 It is a structural schematic diagram of a backstop transmission unit of a centrifugal slurry preheater feed pump provided in an embodiment of the present application; Figure 4 2 is a schematic diagram of the front guard plate inlet structure of a centrifugal slurry preheater feed pump provided in an embodiment of the present application; Figure 5 2 is a schematic diagram of the structure of the front guard plate inlet of the centrifugal slurry preheater feed pump provided in an embodiment of the present application; Figure 6 It is a front view structural schematic diagram of the installation of a C-ring of a centrifugal slurry preheater feed pump provided in an embodiment of the present application; Figure 7 It is a side view structural schematic diagram of the installation of a C-ring of a centrifugal slurry preheater feed pump provided in an embodiment of the present application; Figure 8It is a structural schematic diagram of an adjustable support of a centrifugal slurry preheater feed pump provided in an embodiment of the present application; Fig. 9 It is a schematic diagram of the installation arrangement structure of the feed pump system provided in an embodiment of the present application; Fig.10 It is a schematic diagram of a three-unit series structure of a centrifugal slurry preheater feed pump and a feed pump system provided in an embodiment of the present application.

[0017] Description of reference numerals: 1. Drive unit; 2. Link unit; 3. Check transmission unit; 31. Check unit; 311. Bearing seat; 312. Wedge block; 313. Rotating pin; 314. Spring; 315. Bushing; 316. Stop arm; 32. Transmission unit; 4. Centrifugal unit; 41. Flow unit; 411. Impeller; 412. Volute; 4121. First protrusion; 413. Guard plate; 414. Pump cover; 415. C-shaped ring; 416. Fixing rib; 42. Pressure unit; 5. Sealed cooling unit; 51. Sealed body; 52. Sealed system; 521. Heat exchanger; 522. Forced circulation pump; 523. Accumulator; 53. Liquid replenishing station; 6. Adjustable support; 61. Support traction plate; 62. Adjusting screw; 621. First nut; 63. Slider; 64. Baffle; 65. Slide plate; 66. Anchor bolt; 661. Second nut; P1, first pressure transmitter; P2, second pressure transmitter; P3, third pressure transmitter; B1, first stage pump; B2, second stage pump; B3, third stage pump; G1, medium temperature preheater; D, check valve; E, pipeline; G2, high temperature preheater. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0019] In order to solve the technical problems of severe pump wear, pressure relief and insufficient flow when conveying media containing solid particles, the present application provides a centrifugal slurry preheater feed pump and feed pump system, which adopts the joint action of multiple systems to achieve smooth, continuous, leak-free and safe conveying of high-temperature and high-pressure solid, liquid and gas three-phase flow slurry media.

[0020] See also Figures 1 to 8In the first aspect, an embodiment of the present application discloses a centrifugal slurry preheater feed pump, comprising: a drive unit 1, a link unit 2, a check transmission unit 3, a centrifugal unit 4, a sealing cooling unit 5 and an adjustable support 6.

[0021] The centrifugal unit 4 includes an impeller 411 and a wheel cover structure, wherein the impeller 411 is rotatably arranged inside the wheel cover structure, and a plurality of medium channels are formed in the wheel cover structure through a plurality of blades of the impeller 411. One side of the impeller 411 is connected to the driving unit 1, and the other side is provided with a feed port connected to the wheel cover structure and an opening at one end of the medium channel respectively. The feed port of the wheel cover structure is sequentially provided with first protrusions 4121 along the circumferential direction, the purpose of which is to reduce the wear of the solid medium on the tube wall under the action of centrifugal force. A pump cavity connected to the other end of the medium channel is also formed inside the wheel cover structure; the sealed cooling unit 5 includes a sealing system 52 and a sealing body 51 arranged between the rotor and the stator, and a sealing cavity connected to the isolation liquid outlet of the sealing system 52 is formed between the friction surfaces inside the sealing body 51.

[0022] In this solution, by setting the driving unit 1, the centrifugal unit 4 and the sealing cooling unit 5, the medium enters the opening on one side of the impeller 411 through the feed port of the wheel cover structure, and flows to the medium channel of each blade through the opening. The impeller 411 of the centrifugal unit 4 is connected to the driving unit 1, and is used to rotate in the wheel cover structure under the action of the driving force of the driving unit 1. The medium is thrown into the pump cavity formed inside the wheel cover structure under the centrifugal force of the impeller 411 blades, and finally flows out through the outlet to realize the transportation of the slurry medium; a first protrusion 4121 is set at the feed port of the wheel cover structure, which can hinder the movement trajectory of solid particles, thereby reducing the wear of the solid medium on the pipe wall; a sealing cavity connected to the isolation liquid outlet of the sealing system 52 is formed between the friction surfaces inside the sealing body 51, and the friction surface can be lubricated and cooled by the isolation liquid. The sealing system 52 of the sealing cooling unit 5 can increase the heat exchange of the isolation liquid to ensure that the centrifugal pump operates without leakage between the rotor component and the stator component during the transportation of high-temperature media.

[0023] Preferably, in this embodiment, the driving unit 1 is an electric motor, which can provide a rotational driving force to provide power for the entire system. A base is provided at the bottom of the electric motor, and the base is used to install the driving unit 1, the link unit 2 and the backstop transmission unit 3.

[0024] Of course, in order to transmit the driving force of the motor, in this embodiment, the link unit 2 is a rigid coupling, which is respectively connected to the driving unit 1 and the centrifugal unit 4 for transmitting the rotational torque.

[0025] It should be noted that in other possible embodiments, the driving unit 1 may also be a driving part such as a diesel engine, and the linking unit 2 may also be a belt assembly, which is composed of a belt and a pulley, and the various components are connected by the pulley, and the belt is arranged between the pulleys to transmit the rotational torque.

[0026] Preferably, in this embodiment, please refer to Figure 2 and Figure 3 The non-return transmission unit 3 is composed of a transmission unit 32 and a non-return unit 31. The transmission unit 32 is used to connect the driving end of the driving unit 1 and the impeller 411. The non-return unit 31 is connected to the transmission unit 32, and its function is to prevent the rotor (impeller 411) of the centrifugal unit 4 from rotating in the reverse direction, thereby preventing the mechanical friction damage caused by the loosening of the impeller 411 due to reverse rotation.

[0027] In one embodiment, the transmission unit 32 includes a rotating shaft, and the non-return unit 31 includes a bearing seat 311, a wedge block 312, a rotating pin 313, a spring 314, a sleeve 315 and a stop arm 316.

[0028] Specifically, one end of the rotating shaft is connected to the driving shaft of the motor through a coupling, and the other end of the rotating shaft is connected to the impeller 411. The shaft sleeve 315 is sleeved on the outer side of the rotating shaft, and is connected to the rotating shaft through a keyway, and can rotate with the rotating shaft. The bearing seat 311 is sleeved on the outer side of the shaft sleeve 315, and an annular cavity is formed between the shaft sleeve 315 and the shaft sleeve 315. The outer side of the bearing seat 311 is fixed to the base of the driving unit 1 through the retaining arm 316, wherein the bearing seat 311 and the retaining arm 316 are integrated and connected to the base to form a stationary part. A plurality of rotating pins 313 are evenly arranged in the annular cavity along the circumferential direction, and the ends of the rotating pins 313 are rotatably connected to the bearing seat 311, and two adjacent ones are fixed to the base 316. The spring 314 is installed between the rotating pins 313, and the wedge block 312 is sleeved on each of the rotating pins 313. The two ends of the wedge block 312 respectively abut the outer side surface of the bearing seat 311 and the inner side surface of the sleeve 315. Multiple wedge blocks 312 are radially arranged in the annular cavity, and are deflected in the direction opposite to the rotation direction of the shaft. In this scheme, the shaft moves normally when it rotates counterclockwise, so that each wedge block 312 is deflected clockwise on a reference aligned with the radius of the bearing seat 311. The wedge block 312 can lock the shaft tightly when the shaft reverses.

[0029] When the sleeve 315 rotates counterclockwise with the shaft, the inner side of the wedge block 312 rubs against the sleeve 315 to form an offset angle, so that a small gap is formed between the outer side of the wedge block 312 and the bearing seat 311, thereby operating normally; when the sleeve 315 rotates clockwise, the wedge block 312 rubs against the bearing seat 311 under the combined action of the friction force and the spring 314, and then an angle offset occurs and it is stuck between the sleeve 315 and the bearing seat 311. The force on the bearing seat 311 is transmitted to the base through the stop arm 316, and finally a backstop is formed. The backstop transmission unit 3 is used to prevent the slurry in the pressurized preheater from returning from the pump outlet to the inlet through the pipeline when the centrifugal pump stops working under abnormal circumstances, causing damage to the rotor components. The principle of the backstop is similar to that of a ratchet. It can only rotate in one direction. When it rotates in the opposite direction, it will get stuck, thereby playing a backstop role.

[0030] In order to realize the connection between the impeller 411 and the rotating shaft, in this embodiment, please refer to Figure 2 A second cylindrical protrusion is provided on the side of the impeller 411 away from the feed port of the wheel cover structure, and a cavity is provided inside the second protrusion. The inner diameter of the cavity matches the outer diameter of the rotating shaft, and the inner wall of the cavity is threaded and connected to the rotating shaft of the non-return transmission unit 3 through the thread. The rotating shaft is connected to the motor through a coupling.

[0031] Furthermore, the outer side of the impeller 411 is provided with five blades that are bent and extended outward in sequence along the circumferential direction. The impeller 411 is a disc-mounted structure. The five scattering spatially distorted blades are sandwiched between the front and rear annular cover plates to form a disc-mounted structure with five channels in the radial direction. The cylindrical inlet of the impeller 411 is connected to the five channels, and the medium enters the five channels through the inlet.

[0032] It should be noted that, in other embodiments, the number of blades of the impeller 411 is not limited, and may be more than 5.

[0033] Preferably, in this embodiment, please refer to Figure 2 The centrifugal unit 4 also includes a pressure unit 42, which includes two front and rear pump shells for realizing the encapsulation of the impeller 411 and the wheel cover structure. The impeller 411 and the wheel cover structure form a flow unit 41. The wheel cover structure includes a volute 412, a guard plate 413 and a pump cover 414. One end of the volute 412 forms an annular feed portion. The first protrusion 4121 is arranged on the inner side of the annular feed portion. The other end of the volute 412 surrounds the impeller 411 and is connected to the guard plate 413 and the pump cover 414 in sequence, so that the impeller 411 is in the pump cavity formed by the volute 412, the guard plate 413 and the pump cover 414. The flow unit 41 is made of wear-resistant, corrosion-resistant and high-hardness material, and the pressure unit 42 is made of high-strength ductile iron material. The two work together to ensure the service life of the centrifugal unit 4.

[0034] During implementation, when the motor rotates, it transmits torque to the impeller 411 to make it rotate. Under the centrifugal force of the blades of the impeller 411, the medium is thrown into the pump chamber composed of the volute 412, the guard plate 413 and the pump cover 414, and finally flows out through the outlet of the volute 412.

[0035] Preferably, in this embodiment, please refer to Figure 5 The first protrusion 4121 is scattered, and its purpose is to reduce the wear of the solid medium on the pipe wall under the action of centrifugal force. The principle is as follows: the medium flows in the cylindrical pipe, and when it is sucked into the pump inlet, the impeller 411 drives the medium to rotate inside the pipe wall. Because the solid particles are ore and have a greater specific gravity than water, their running tracks stick to the inside of the pipe wall, thereby causing wear on the pipe wall. Adding protrusions along the axial direction inside the inlet pipe wall of the volute 412 can hinder the movement track of solid particles, thereby reducing the wear of the solid medium on the pipe wall.

[0036] Preferably, in this embodiment, please refer to Figure 6 and Figure 7 In the relatively closed cavity composed of the volute 412, the front guard plate 413, and the rear guard plate 413, the centrifugal unit 4 adopts a C-shaped ring 415 structure to ensure the installation and sealing of parts. The C-shaped ring 415 is arranged in sequence along the connection between the volute 412 and the guard plate 413. The two protrusions of the C-shaped ring 415 are respectively connected to the volute 412 and the guard plate 413, so that the two C-shaped protrusions of the structure form a seal with the volute 412 and the guard plate 413 respectively, ensuring that the high-pressure cavity does not leak. In addition, in order to eliminate the thermal expansion and contraction of the metal material during the temperature change process, a certain gap δ is left between the guard plate 413 and the volute 412, and the size of the gap is 0.01% to 0.02% of the maximum outer diameter of the guard plate 413.

[0037] Furthermore, a plurality of fixing ribs 416 are evenly distributed along the circumferential direction on the side of the C-shaped ring 415 away from the volute 412 , and the fixing ribs 416 are distributed in a scattered manner, thereby ensuring the sealing performance and strength of the seal.

[0038] Preferably, in this embodiment, please refer to Figure 2 The sealing system 52 includes a heat exchanger 521, a forced circulation pump 522, an accumulator 523 and a liquid replenishing station 53. The liquid inlet end of the heat exchanger 521 is connected to the liquid discharge port of the sealed cavity through the accumulator 523, and the liquid discharge end is connected to the liquid inlet of the sealed cavity through the forced circulation pump 522. The liquid supply end of the liquid replenishing station 53 is connected to the heat exchanger 521. The outlet of the pressure unit 42 is equipped with a third pressure transmitter P3, the accumulator 523 is equipped with a second pressure transmitter P2, and the liquid replenishing station 53 is equipped with a first pressure transmitter P1.

[0039] The liquid replenishing station 53 provides isolation liquid for the whole system, the sealing system 52 realizes the circulation and cooling of the isolation liquid, and the sealing body 51 is installed in the centrifugal unit 4 to ensure that the medium does not leak out when the centrifugal pump is in operation.

[0040] During implementation, the heat exchange of the isolation liquid is increased by the forced circulation pump 522 to ensure that the centrifugal pump operates without leakage between the rotor component and the stator component during the transportation of high-temperature media. The sealing body 51 is installed between the pump rotor component and the stator component, and is actually installed between the rotating shaft and the pump cover 414. The sealing cavity of the sealing body 51 is connected with the isolation liquid from the sealing system 52 to provide lubrication for the friction surface. The isolation liquid of the sealing system 52 is supplied by the liquid replenishment station 53, wherein the sealing system 52 is equipped with a pressure sensor, which can feedback the pressure value of the isolation liquid in the sealing cavity at any time, and the pump outlet pressure transmitter timely feedbacks the pump outlet pressure value. Through the interlocking relationship, the pressure value of the isolation liquid in the sealing cavity is always kept greater than the pump outlet pressure value by 0.3MPa, thereby ensuring that the mechanical seal is well lubricated.

[0041] The impeller 411 is mounted on the transmission unit 32. An axial adjustment mechanism is designed between the transmission unit 32 and the stator to achieve axial relative movement between the two, ensuring that the gap γ between the impeller 411 and the front guard plate 413 is 0.5 mm. This gap ensures that the rotor components can run smoothly while minimizing the flow rate of the medium flowing back from the volute 412 cavity to the pump inlet, thereby achieving efficient operation of the centrifugal pump. In this embodiment, please refer to Figure 2 and Figure 8 The axial adjustment mechanism is an adjustable support 6, which includes a support traction plate 61, an adjustment screw 62, a slider 63, a baffle 64, a slide plate 65 and an anchor bolt 66.

[0042] Specifically, the support traction plate 61 and the baffle 64 are welded to the base as a whole and installed as a whole with the pump. The slide plate 65 is fixed to the bottom end of the baffle 64. The anchor bolt 66 is movably connected to the slide plate 65 and can slide on the slide plate 65 and the baffle 64 along the axial direction of the pump. The slider 63 is sleeved on the anchor bolt 66, and the anchor bolt 66 is prefabricated and fixed in the foundation. The adjustment screw 62 is extended along the axial direction of the drive unit 1, and is threadedly connected to the support traction plate 61, and one end is rotatably connected to the slide plate 65 to adjust the slide plate 65 to move in a direction parallel to the axis of the drive unit 1.

[0043] When the pump is installed and pressed, it needs to move axially as a whole. At this time, by adjusting the adjustment screw 62, the distance between the slider 63 and the support traction plate 61 is increased, so that the pump unit moves axially to a certain displacement relative to the anchor bolt 66. In particular, the baffle 64 prevents the slider 63 from radially offset during the movement; the contact surfaces of the slide plate 65 and the baffle 64 are processed very smoothly to reduce the friction during the movement.

[0044] Furthermore, the end of the adjusting screw 62 is threadedly connected with a first nut 621, and the position of the adjusting screw 62 and the support traction plate 61 is locked by the first nut 621; the top end of the anchor bolt 66 is threadedly connected with a second nut 661, and the second nut 661 can be tightened and locked after the position is adjusted to prevent secondary axial movement; the adjustable support 6 can achieve the overall axial displacement of a single set of equipment by adjusting the top screw and the limit nut, thereby ensuring that the sealing gasket is tightened when three sets of equipment are installed in series.

[0045] See also Fig. 9 and Fig.10 In a second aspect, an embodiment of the present application further provides a feed pump system, comprising a centrifugal slurry preheater feed pump as described in any one of the above embodiments, wherein three centrifugal slurry preheater feed pumps are provided, and the three centrifugal slurry preheater feed pumps are operated in series end to end.

[0046] For ease of introduction, the three centrifugal slurry preheater feed pumps are defined as the first stage pump B1, the second stage pump B2 and the third stage pump B3. In some embodiments, the feed pump system further includes a medium temperature preheater G1, a check valve D, a pipeline E and a high temperature preheater G2. Each preheater is connected to the pump through a pipeline.

[0047] Specifically, the medium-temperature preheater G1 is a dome-shaped cylindrical sealed container with an internal pressure of about 0.8MPa. It stores acid-containing slurry with a temperature of 105°C and a solid content of 30% to 45%. During implementation, the medium in the container needs to be transported to the high-temperature preheater G2. Similarly, the high-temperature preheater G2 is a dome-shaped cylindrical sealed container with an internal pressure of about 2MPa. The present invention uses three high-temperature and high-pressure slurry preheater feed pumps to run in series. The advantage is that the flow rate is the same as that of a single pump, and the head is the superposition of three pumps, which solves the problem that high-pressure slurry can only be transported into the preheater. In particular, a check valve is provided at the outlet of the third-stage pump to prevent the backflow of pressurized medium in the high-temperature preheater G2 under abnormal conditions.

[0048] During implementation, the medium of the medium-temperature preheater G1 is sucked from the inlet of the first-stage pump B1, passes through the second-stage pump B2, and is finally discharged from the outlet of the third-stage pump B3 to the high-temperature preheater G2.

[0049] The present application forms a feed pump system by running three pumps in series. The centrifugal slurry preheater feed pump is composed of a drive unit 1, a centrifugal unit 4 and a sealed cooling unit 5. The drive unit 1 is used to realize the rotation of the impeller 411. During the implementation process, the first-stage pump impeller 411 rotates under the drive of the drive unit 1, and the negative pressure generated by the centrifugal force sucks the medium in the medium-temperature preheater into the feed port of the wheel cover structure, and the centrifugal force generated by the rotation of the blades throws the medium into the pump cavity, gathers in the pump cavity, and flows to the outlet of the wheel cover structure, and then enters the second-stage pump, and then enters the third-stage pump, until the last It is transported to the high-temperature preheater, where each stage of the pump will increase the pressure of the fluid, and the final output pressure will be the sum of the pressures provided by each pump, so that each pump plays a role in increasing the fluid pressure to ensure that the fluid can pass through the entire system smoothly and can withstand the operating conditions under high temperature and high pressure environments, thereby achieving smooth, continuous and leak-free safe transportation of high-temperature and high-pressure solid, liquid and gas three-phase flow slurry media; at the same time, a first protrusion 4121 is provided at the feed port of the wheel cover structure, which can hinder the movement trajectory of solid particles, thereby reducing the wear of the solid medium on the pipe wall.

[0050] The present application sets up a sealed cooling unit 5, and a sealed cavity connected to the isolation liquid outlet of the sealing system 52 is formed between the friction surfaces inside the sealing body 51. The friction surfaces can be lubricated and cooled by the isolation liquid. The sealing system 52 of the sealed cooling unit 5 can increase the heat exchange capacity of the isolation liquid, thereby ensuring that the rotor components and the stator components of the centrifugal pump operate without leakage during the transportation of high-temperature media.

[0051] In the description of the present application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0052] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0053] The specific implementation methods of the present application described above do not constitute a limitation on the protection scope of the present application. Any other corresponding changes and modifications made according to the technical concept of the present application should be included in the protection scope of the claims of the present application.

Claims

1. A centrifugal slurry preheater feed pump, characterized in that: include: Drive unit; A centrifugal unit, comprising an impeller and a wheel cover structure, wherein the impeller is rotatably arranged inside the wheel cover structure, wherein a plurality of medium channels are formed in the wheel cover structure through a plurality of blades of the impeller, wherein one side of the impeller is connected to the driving unit, and the other side is provided with an opening respectively connected to a feed port of the wheel cover structure and one end of the medium channel, wherein the feed port of the wheel cover structure is sequentially provided with first protrusions along the circumferential direction, and a pump cavity connected to the other end of the medium channel is also formed inside the feed port of the wheel cover structure; and, The sealed cooling unit comprises a sealing system and a sealing body arranged between a rotor and a stator, wherein a sealing cavity communicating with an isolation liquid outlet of the sealing system is formed between friction surfaces inside the sealing body.

2. The centrifugal slurry preheater feed pump according to claim 1, characterized in that: A second protrusion is provided on the side of the impeller away from the feed port of the wheel cover structure, a cavity is provided inside the second protrusion, the inner wall of the cavity has threads and is connected to the driving unit through the threads, and five blades that are bent and extended outward are sequentially provided on the outer side of the impeller along the circumferential direction.

3. The centrifugal slurry preheater feed pump according to claim 1, characterized in that: The wheel cover structure includes a volute, a guard plate and a pump cover, one end of the volute forms an annular feed portion, the first protrusion is arranged on the inner side of the annular feed portion, and the other end of the volute surrounds the impeller and is sequentially connected to the guard plate and the pump cover, so that the impeller is in the pump chamber formed by the volute, the guard plate and the pump cover.

4. The centrifugal slurry preheater feed pump according to claim 3, characterized in that: The connection between the volute and the guard plate is sealed by a C-shaped ring, which is arranged in sequence along the connection between the volute and the guard plate. The two protrusions of the C-shaped ring are respectively connected to the volute and the guard plate, and a plurality of fixing ribs are evenly distributed along the circumferential direction on the side of the C-shaped ring away from the volute.

5. The centrifugal slurry preheater feed pump according to claim 1, characterized in that: The sealing system includes a heat exchanger, a forced circulation pump, an accumulator and a liquid replenishing station. The liquid inlet end of the heat exchanger is connected to the liquid discharge port of the sealed cavity through the accumulator, and the liquid discharge end is connected to the liquid inlet of the sealed cavity through the forced circulation pump. The liquid supply end of the liquid replenishing station is connected to the heat exchanger.

6. The centrifugal slurry preheater feed pump according to claim 1, characterized in that: The centrifugal slurry preheater feed pump further includes a link unit, which connects a driving end of the driving unit and the impeller to transmit a rotational torque.

7. The centrifugal slurry preheater feed pump according to claim 6, characterized in that: The centrifugal slurry preheater feed pump also includes a non-return transmission unit, which includes a transmission unit and a non-return unit. The transmission unit is connected to the driving end of the driving unit and the impeller, and the non-return unit is connected to the transmission unit to prevent the transmission unit from rotating in the opposite direction.

8. The centrifugal slurry preheater feed pump according to claim 7, characterized in that: The transmission unit comprises a rotating shaft, one end of which is connected to the driving end of the driving unit through a link unit, and the other end of which is connected to the impeller; The check unit includes a bearing seat, a wedge block, a rotating pin, a spring, a sleeve and a stop arm. The sleeve is sleeved on the outer side of the rotating shaft. The bearing seat is sleeved on the outer side of the sleeve to form an annular cavity with the sleeve. The outer side of the bearing seat is fixed to the base of the driving unit through the stop arm. A plurality of rotating pins are evenly arranged along the circumference in the annular cavity. The rotating pins are rotatably connected to the bearing seat. The spring is installed between two adjacent rotating pins. The wedge block is sleeved on each rotating pin. The two ends of the wedge block respectively abut the outer surface of the bearing seat and the inner surface of the sleeve to tightly lock the rotating shaft when the rotating shaft reverses.

9. The centrifugal slurry preheater feed pump according to claim 1, characterized in that: The centrifugal slurry preheater feed pump also includes an adjustable support, which includes a support traction plate, an adjustment screw, a slider, a baffle, a slide plate and an anchor bolt. The support traction plate and the baffle are fixedly connected to the base of the drive unit, the slide plate is fixed to the bottom end of the baffle, the anchor bolt is movably connected to the slide plate, the slider is sleeved on the anchor bolt, and the adjustment screw is extended along the axial direction of the drive unit, is threadedly connected to the support traction plate, and one end is rotatably connected to the slide plate to adjust the slide plate to move in a direction parallel to the axis of the drive unit.

10. A feed pump system, characterized in that: It comprises the centrifugal slurry preheater feed pump according to any one of claims 1 to 9, wherein three centrifugal slurry preheater feed pumps are provided and the three centrifugal slurry preheater feed pumps are connected in sequence.

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