Carbon dioxide booster pump

Abstract

The invention relates to the technical field of oil field recovery, in particular to a carbon dioxide booster pump which comprises a shell, the shell is divided into an upper half and a lower half, a gasket is arranged between the two halves, the two halves are installed through a bolt column, and mechanical seals are arranged at the two ends of the shell; the main shaft is assembled in the two mechanical seals; the main shaft is sequentially provided with a throat bushing, an inner bushing, an impeller ring, a left-handed impeller, a middle bushing and a right-handed impeller which are positioned in the shell from left to right; wherein each left-handed impeller and each right-handed impeller are respectively provided with an impeller ring, and the left-handed impellers and the right-handed impellers adopt the same structure, are opposite in mounting direction and are bilaterally symmetrical about the middle bushing; an inner cavity matched with the left-handed impeller and the right-handed impeller is formed in the shell. According to the single-shell double-volute horizontal multi-stage impeller centrifugal pump, a transition flow channel is of a volute type volute body structure, radial force and axial force are automatically balanced, no complex balance mechanism exists, and stability is high.

Description

Technical Field

[0001] The present invention relates to the technical field of oilfield recovery equipment, and in particular to a carbon dioxide booster pump. Background Art

[0002] The information disclosed in the background art of the present invention is only intended to increase the understanding of the overall background of the present invention, and does not necessarily be regarded as an admission or imply in any form that this information constitutes the prior art already known to those of ordinary skill in the art.

[0003] Carbon dioxide flooding is a technology that injects carbon dioxide into the oil reservoir to improve the oil recovery rate of the oilfield. When carbon dioxide first contacts the formation crude oil, it does not form a miscible phase. However, under the conditions of appropriate pressure, temperature, and crude oil composition, carbon dioxide can form a miscible front. The supercritical fluid will extract heavier hydrocarbons from the crude oil and continuously concentrate the gas at the displacement front. Thus, carbon dioxide and crude oil become a miscible liquid, forming a single liquid phase, which can effectively displace the formation crude oil to the production well. A key parameter for applying miscible flooding to improve oil recovery is the minimum miscible pressure (MMP) of the gas and the crude oil. MMP is the basis for determining the optimal working pressure of gas flooding. Generally, because miscible flooding can recover more crude oil than immiscible flooding, it is desirable to perform gas flooding at or slightly above MMP. If the pressure is much higher than MMP, it is easy to cause formation fractures and cannot guarantee the safety of the production process. As a result, not only can the crude oil production not be increased significantly, but also the economic benefits will be reduced. Carbon dioxide flooding can generally increase the oil recovery rate by 7% - 15% and extend the production life of oil wells by 15 - 20 years.

[0004] Carbon dioxide sequestration refers to capturing and compressing carbon dioxide generated by large emission sources and transporting it to a selected location for long-term storage instead of releasing it into the atmosphere. The supercritical carbon dioxide transport pump is mainly used in the pipeline transportation of carbon dioxide sequestration technology - geological (ocean) sequestration projects. Pipeline transportation usually adopts the supercritical state of carbon dioxide, which is suitable for large-capacity, long-distance, and stable-load directional transportation. The supercritical carbon dioxide transport pump transports carbon dioxide through the pipeline to the carbon dioxide injection pump and injects it into geological structures 5000m underground, such as oilfields, natural gas reservoirs, saline formations, and unmineable coal seams. Carbon dioxide sequestration technology, especially geological sequestration, has received increasing attention and research. The United States, the European Union, Japan, Australia, etc. have all formulated corresponding research plans to carry out theoretical, experimental, demonstration, and application research on carbon dioxide sequestration technology.

[0005] In China, the research on CCUS started relatively late. At present, the development of each technical link is unbalanced, and there is still a large gap from large-scale and full-process demonstration applications. In particular, the research on carbon dioxide subsea storage is blank. There is no suitable equipment in China to boost and transport carbon dioxide in the supercritical state. Usually, the piston pumps and plunger pumps with crankshaft connecting rods are easy to have unorganized leakage due to high speed and are not suitable for high-pressure media in the supercritical state. Diaphragm pumps can avoid leakage, but their service life is too short, only about 15 days. The above pump types simply cannot meet the usage requirements.

[0006] At present, the overall level of carbon dioxide storage and supercritical fluid carbon dioxide transportation technology in China is relatively low. The local procurement rate of key supporting equipment is far lower than that of developed countries. High-end equipment, especially supercritical carbon dioxide transport pumps and injection pumps, all rely on imports. Among them, as the key core equipment for carbon dioxide storage, the domestic market of supercritical carbon dioxide transport pumps is monopolized by foreign enterprises, which greatly restricts the development, utilization and industrial development of carbon dioxide storage technology in China.

[0007] CN203809297U, a skid-mounted large-displacement carbon dioxide booster pump device, can inhale liquid carbon dioxide through 16 suction ports with 4″ butterfly valves, which can greatly increase the suction displacement. Two carbon dioxide gas-liquid separation tanks can separate the gas in the liquid carbon dioxide from the suction pipe faster, and can provide sufficient liquid carbon dioxide to the inlet of the booster pump under the condition of large displacement. Two parallel carbon dioxide booster pumps can boost the liquid carbon dioxide under the condition of large displacement and pump it to the suction port of the large pump of the fracturing truck through the discharge manifold valve to complete the designed pumping displacement.

[0008] CN104196699B, a gas booster pump. By setting a closed intake cavity, it can boost air or other high-purity gases. By setting a guide sleeve, the swing of the connecting rod can be converted into the linear motion of the push-pull rod, and the linear motion can greatly improve the service life of the piston assembly. By setting a rod seal ring, it has the double seals of piston rings and rod seal rings to improve the reliability of the external seal of the boosted gas.

[0009] CN112727785A, a multi-stage gas booster pump, includes a pump body. There are two or more booster chambers arranged in the pump body. Each booster chamber is connected end to end in sequence, and the volume of each booster chamber gradually decreases in the direction from the head end to the tail end. An air inlet connected to the booster chamber at the most head end and an air outlet connected to the booster chamber at the most tail end are arranged on the pump body; an impeller is respectively arranged in each booster chamber, and a driving device is arranged on the pump body. The driving device is used to drive each impeller to rotate so that the gas in each booster chamber flows from the head end to the tail end, pressurizing the gas step by step. And because each booster chamber is independent of each other, it can effectively maintain the stability of the air flow direction, reduce the backflow of gas and the mutual interference of air flows. Therefore, it can effectively improve the pressurization effect on gas and can continuously and stably maintain the supply of high-pressure gas.

[0010] The above-mentioned booster pumps are not suitable for high-pressure media in the supercritical state. There is an urgent need to study the technology for boosting and transporting carbon dioxide in the supercritical state to fill the key technology gap of domestic supercritical carbon dioxide transport pumps. Summary of the Invention

[0011] Aiming at the technical problem that there is no suitable equipment in China to boost and transport carbon dioxide in the supercritical state. Usually, the plunger pumps and piston pumps with crankshaft and connecting rod are easy to have unorganized leakage at high speed and are not suitable for high-pressure media in the supercritical state. The diaphragm pump can avoid leakage, but its service life is too short and it can only be used for about fifteen days. The above pump types simply cannot meet the usage requirements. The present invention provides a carbon dioxide booster pump, which conforms to the long-term interests of sustainable high-quality continuous development.

[0012] To solve the existing technical problems, the technical solution adopted by the present invention is:

[0013] A carbon dioxide booster pump includes a housing. The housing is divided into upper and lower halves. A gasket is padded between the two halves and they are installed through bolt columns. Mechanical seals are arranged at both ends of the housing;

[0014] It also includes a main shaft assembled in two mechanical seals. A throat bushing, an inner bushing, a stuffing box, a left-handed impeller, an intermediate bushing and a right-handed impeller are sequentially installed on the main shaft from left to right in the housing;

[0015] Among them, each of the left-handed impeller and the right-handed impeller is respectively equipped with a stuffing box. The left-handed impeller and the right-handed impeller adopt the same structure and their installation directions are opposite, being symmetric about the intermediate bushing left and right;

[0016] An inner cavity adapted to the left-handed impeller and the right-handed impeller is arranged in the housing.

[0017] Preferably, the left-handed impeller and the right-handed impeller are both provided with slots, and a plurality of arc-shaped flow guiding plates are arranged in the slots. The left-handed impeller and the right-handed impeller both comprise two spaced plate-like structures. The flow guiding plates serve as fan blades arranged within the two plate-like structures and fix the two plate-like structures into one body;

[0018] The stuffing box and the corresponding left-handed impeller or right-handed impeller are connected by snap-fitting through slots provided, and are connected by inserting stud bolts into the slots.

[0019] Preferably, outlets and inlets are further provided on both sides of the housing, and a balance pipe connecting both ends is further provided at the bottom; the housing is provided with three groups of steel pipes including a first steel pipe group, a second steel pipe group and a third steel pipe group respectively;

[0020] The first steel pipe group and the second steel pipe group are arranged in the middle of the top surface of the housing and on one side of the top surface of the housing where the inlet is located, and the third steel pipe group is arranged in the middle of the bottom surface of the housing.

[0021] Preferably, a left bearing box connecting the main shaft is installed at the left end of the housing. A blower is provided on the left side of the left bearing box, two groups of thermocouples and two groups of pressure sensors are provided above, a group of constant-level oil cups is further provided on the front, and a group of metal thermometers is further provided on the side;

[0022] Inside the left bearing box, a bearing isolator, an oil slinger, a bearing anti-rotation sleeve, two groups of sliding bearings and a dust-proof disc are successively arranged from left to right. The dust-proof disc is composed of a moving ring fitting the main shaft and a stationary ring assembled outside the moving ring.

[0023] Preferably, a right bearing box connecting the main shaft is installed at the right end of the housing. Two groups of thermocouples and two groups of pressure sensors are provided above the right bearing box, a group of constant-level oil cups is further provided on the front, and a group of metal thermometers is further provided on the side;

[0024] Two groups of dust-proof discs are provided at both ends inside the right bearing box. Two groups of sliding bearings are provided between the two groups of dust-proof discs, and a pressure ring connecting the thermocouples is provided between the two groups of sliding bearings.

[0025] Preferably, an oil drain plug is provided at the bottom of the sliding bearing, and a gas vent plug is provided at the upper part.

[0026] Preferably, both the left-handed impeller and the right-handed impeller are integral castings; the throat bushing and the inner bushing are detachably connected.

[0027] Preferably, a driving motor is drivingly connected to the main shaft at the end of the right bearing box to drive the left-handed impeller and the right-handed impeller on the main shaft to rotate, so as to discharge the high-pressure carbon dioxide in the supercritical state entering from the inlet from the outlet.

[0028] Preferably, the mechanical seal is a cartridge type double - face balanced seal; the seal flushing liquid between the double - face seals is a hydrodynamic flushing type.

[0029] Preferably, white oil is used as the seal flushing liquid between the double - face seals.

[0030] Beneficial effects: The present invention is a single - casing double - volute horizontal multi - stage impeller centrifugal pump. The transition flow path adopts a volute - type spiral body structure, which is symmetrically arranged above and below the center line, and the radial force is automatically balanced. At the same time, the left - hand impeller and the right - hand impeller are symmetrically arranged back - to - back, and the axial force is automatically balanced. There is no complex balancing mechanism, and the stability is relatively high.

[0031] By setting the radial bearings as sliding bearings, and one pair is arranged at each of the drive end and the non - drive end, the main shaft drive is more stable.

[0032] Due to the stable main shaft drive, during the operation of the present invention, through testing, the deflection of the shaft at the seal caused by the radial load does not exceed 50μm. Static balance and dynamic balance tests are carried out on the rotor and the main rotating components of the pump. The static balance accuracy is not less than G6.3, and the dynamic balance accuracy is not less than G2.5.

[0033] The throat bushing and the inner bushing are replaceable and are made of wear - resistant, corrosion - resistant, and erosion - resistant materials, so that the bushings including the throat bushing and the inner bushing are reliably fixed on the shaft and can meet the temperature changes under working conditions without loosening.

[0034] All chambers are sealed, which can effectively prevent the splashing of foreign harmful media.

[0035] Under the rated working conditions of this equipment, within 10,000 hours of cumulative operation of the centrifugal pump, the pump efficiency decline is not greater than 1%, which greatly guarantees the service life of the pump. Brief Description of the Drawings

[0036] Figure 1 is the front - view three - dimensional view of the present invention;

[0037] Figure 2 is the rear - view three - dimensional view of the present invention;

[0038] Figure 3 is the internal structure diagram of the housing of the present invention;

[0039] Figure 4 is the internal structure diagram of the bearing box of the present invention;

[0040] Figure 5 is the impeller structure diagram of the present invention;

[0041] Figure 6 is the wearing ring structure diagram of the present invention.

[0042] The reference numerals in the drawings are shown as follows:

[0043] In the figure, 100 is the housing; 101 is the dust-proof disc; 103 is the pressing ring; 110 is the mechanical seal; 130 is the main shaft; 131 is the throat bushing; 132 is the inner bushing; 133 is the gland; 134 is the left-handed impeller; 135 is the intermediate bushing; 136 is the right-handed impeller; 137 is the slot; 138 is the deflector; 139 is the clamping groove; 140 is the gasket; 150 is the bolt column; 160 is the outlet; 170 is the inlet; 180 is the balance pipe; 190 is the steel pipe; 191 is the first steel pipe; 192 is the second steel pipe; 193 is the third steel pipe; 200 is the left bearing housing; 210 is the fan; 220 is the thermocouple; 230 is the pressure sensor; 240 is the constant-level oil cup; 250 is the thermometer; 260 is the bearing isolator; 270 is the oil slinger; 280 is the anti-rotation sleeve for bearing; 290 is the sliding bearing; 300 is the right bearing housing. Detailed implementation manners

[0044] To further understand the features, technical means, specific purposes and functions achieved by the present invention, the present invention will be further described in detail below in conjunction with the drawings and specific implementation manners.

[0045] Figures 1 to 6 There is shown a carbon dioxide booster pump, including: a housing 100, mechanical seals 110 provided at both ends of the housing 100, a main shaft 130 assembled within the two mechanical seals 110, the housing 100 being divided into upper and lower halves, with a gasket 140 interposed therebetween and being installed by means of bolt columns 150. On the main shaft 130, there are successively installed from left to right a throat bushing 131, an inner bushing 132, a gland 133, a left-handed impeller 134, an intermediate bushing 135 and a right-handed impeller 136 within the housing 100. Among them, each left-handed impeller 134 and right-handed impeller 136 is respectively equipped with a gland 133, and the left-handed impeller 134 and the right-handed impeller 136 have the same structure and are installed in opposite directions. In addition, an inner cavity (a cylindrical structure such as the inner diameter of the gasket 140) adapted to the left-handed impeller 134 and the right-handed impeller 136 is left within the housing 100.

[0046] All sealed chambers of this carbon dioxide booster pump can effectively prevent the splashing of foreign harmful media. The structure of this carbon dioxide booster pump makes it suitable for high-pressure media in the supercritical state, can avoid leakage, and has a long service life.

[0047] In another embodiment, slots 137 are provided on both the left-handed impeller 134 / right-handed impeller 136. An arc-shaped flow guide plate 138 is provided in the slot 137. The flow guide plate 138 is equivalent to a fan blade disposed within two plate-like structures. The two circular plates are connected by the flow guide plate 138 to form the structure of the left-handed impeller 134 / right-handed impeller 136. Corresponding card slots 139 are provided on the wearing ring 133 and the left-handed impeller 134 / right-handed impeller 136 respectively. The connection can be completed by inserting a stud into the card slot 139.

[0048] In another embodiment, outlets 160 and inlets 170 are further provided on both sides of the housing 100, and a balance pipe 180 connecting both ends is provided at the bottom. Three groups of steel pipes 190 are provided on the housing, namely a first steel pipe group 191, a second steel pipe group 192, and a third steel pipe group 193.

[0049] The first steel pipe group 191 and the second steel pipe group 192 are disposed in the middle of the top surface of the housing 100 and on one side of the inlet 170 on the top surface of the housing 100, and the third steel pipe group 193 is disposed in the middle of the bottom surface of the housing 100.

[0050] In another embodiment, a left bearing housing 200 connecting the main shaft 130 is installed at the left end of the housing 100. A fan 210 is provided on the left side of the left bearing housing 200, two groups of thermocouples 220 are provided above, two groups of pressure sensors 230 are provided, a constant-level oil cup 240 is provided on the front, and a metal thermometer 250 is provided on the side. Inside the left bearing housing 200, a bearing isolator 260, an oil slinger 270, a bearing anti-rotation sleeve 280, two groups of sliding bearings 290, and a dust-proof disc 101 are sequentially provided from left to right. The dust-proof disc 101 is composed of a moving ring fitting the main shaft 130 and a stationary ring assembled outside the moving ring.

[0051] In another embodiment, a right bearing housing 300 connecting the main shaft 130 is installed at the left end of the housing 100. A constant-level oil cup 240, a thermocouple 220, a pressure sensor 230, and a metal thermometer 250 are also provided thereon. Two groups of dust-proof discs 101 are provided at both ends inside, two groups of sliding bearings 290 are provided between the two groups of dust-proof discs 101, and a pressure ring 103 connecting the thermocouple 220 is provided between the two groups of sliding bearings 290.

[0052] In another embodiment, an oil drain plug is provided at the bottom of the sliding bearing 290, and a gas vent plug is provided at the upper part.

[0053] Both the left-handed impeller 134 and the right-handed impeller 136 are integral castings; the throat bushing 131 and the inner bushing 132 are detachably connected, specifically, they can be connected by threaded fasteners.

[0054] In another embodiment, the mechanical seal 110 is a cartridge type double-ended balanced seal; the seal flushing fluid between the double-ended seals is hydrodynamic flushing. Fully considering the influence of the flushing fluid on the pump's transported medium carbon dioxide and the influence of the pump's transported medium carbon dioxide on the flushing fluid, white oil is used as the mechanical seal 110 flushing fluid between the double-ended seals.

[0055] In another embodiment, the normal operating point of this carbon dioxide booster pump is within the high-efficiency range of the pump, the rated point of the pump is within the range of 80% to 110% of the flow rate at the best efficiency point, the impeller of the pump is 231 mm, and the head of the pump corresponds to the maximum flow rate or the rated flow rate. The rated load of the selected impeller size does not exceed 90% of the rated load of the maximum impeller size.

[0056] In another embodiment, a drive motor is drivingly connected to the main shaft 130 at the end of the right bearing housing 300 of the carbon dioxide booster pump to drive the left-handed impeller 134 and the right-handed impeller 136 on the main shaft 130 to rotate, so as to discharge the high-pressure carbon dioxide in the supercritical state entering from the inlet from the outlet.

[0057] In another embodiment, all the external pipeline interfaces of this carbon dioxide booster pump adopt flange connections. For the pipe orifices on the equipment body that are not connected to the external pipeline, stop valves and plugs are configured.

[0058] In another embodiment, for all the external cables of this carbon dioxide booster pump, the required external cable interfaces are reserved in the junction box, and connection seals such as gland heads and flexible connecting pipes for the external cable interfaces are provided. All the fixing and connecting accessories are provided in a complete set, and the specifications need to be configured according to the cable specifications, models and numbers provided by the design.

[0059] In another embodiment, the temperature and vibration signals of this carbon dioxide booster pump and the motor are uploaded to the station control system. The station control system is provided with an upload signal interface, and the owner is responsible for the wiring between the signal upload and the station control system. The pressure and temperature signals in the mechanical seal 110 flushing system are uploaded to the station control system. The station control system is provided with the above-mentioned upload signal interfaces, and the owner is responsible for uploading the signals and the wiring between the signals and the station control system.

[0060] In another embodiment, all the holes or gaps on the bearing body of this carbon dioxide booster pump that communicate with the outside can prevent the entry of dust and the transported medium and the leakage of lubricant under normal operating conditions.

[0061] In another embodiment, this carbon dioxide booster pump further includes auxiliary systems such as pump body liquid drainage, venting, and seal flushing pipelines, etc. At the same time, accessories on the pipelines such as pressure gauges and valves are provided and installed on the pump body or within the range of the combined base in an assembled form for easy disassembly and maintenance.

[0062] The present invention is a single-casing double-volute horizontal multi-stage impeller centrifugal pump. The transition flow passage adopts a volute-shaped spiral structure, which is symmetrically arranged above and below the center line, and the radial force is automatically balanced. At the same time, the left-handed impeller and the right-handed impeller are symmetrically arranged back to back, and the axial force is automatically balanced. There is no complex balancing mechanism, and the stability is relatively high. It breaks the technical monopoly and fills the key technical gap of supercritical carbon dioxide transport pumps in China.

[0063] The radial bearings are set as sliding bearings 290, with a pair arranged at each of the drive end and the non-drive end, and the thrust bearings are a pair of angular contact ball bearings arranged back to back diagonally.

[0064] During the operation of the present invention, due to the radial load, the deflection of the shaft at the seal does not exceed 50 μm. The rotor and the main rotating components of the pump are subjected to static balance and dynamic balance tests. The static balance accuracy is not lower than G6.3, and the dynamic balance accuracy is not lower than G2.5.

[0065] The throat bushing 131 and the inner bushing 132 are replaceable and are made of wear-resistant, corrosion-resistant, and erosion-resistant materials, so that the bushings including the throat bushing 131 and the inner bushing 132 are reliably fixed on the main shaft 130 and can meet the temperature changes under working conditions without loosening.

[0066] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same and similar parts among the embodiments, reference can be made to each other.

[0067] Terms such as "upper", "lower", "outer side", "inner side", etc. in the specification, claims and above-mentioned drawings of the present invention, if any, are used to distinguish the relative relationships in position and do not have to be qualitatively defined. It should be understood that such used data can be interchanged under appropriate circumstances, so that the embodiments of the present invention described herein can be implemented in an order different from those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0068] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A carbon dioxide booster pump, comprising a housing, characterized in that: The housing is divided into upper and lower halves, with a gasket padded between the two halves and installed through bolt columns, and mechanical seals are provided at both ends of the housing; It further includes a main shaft assembled within two mechanical seals, and a throat bushing, an inner bushing, a stuffing box, a left-handed impeller, an intermediate bushing, and a right-handed impeller located within the housing are sequentially installed on the main shaft from left to right; Wherein, each of the left-handed impeller and the right-handed impeller is respectively equipped with a stuffing box, the left-handed impeller and the right-handed impeller have the same structure, and their installation directions are opposite, being symmetric about the intermediate bushing left and right; An inner cavity adapted to the left-handed impeller and the right-handed impeller is provided within the housing.

2. The carbon dioxide booster pump according to claim 1, characterized in that: Slots are provided on both the left-handed impeller and the right-handed impeller, and a plurality of arc-shaped flow guide plates are provided within the slots. Both the left-handed impeller and the right-handed impeller are each composed of two spaced plate-like structures, and the flow guide plates serve as fan blades provided within the two plate-like structures and fix the two plate-like structures into one body; The stuffing box and the corresponding left-handed impeller or right-handed impeller are connected by snap-fitting through the provided slots and are connected by inserting studs into the slots.

3. The carbon dioxide booster pump according to claim 2, characterized in that: An outlet and an inlet are further provided on both sides of the housing, and a balance pipe connecting both ends is provided at the bottom; The housing is provided with three groups of steel pipes including a first steel pipe group, a second steel pipe group, and a third steel pipe group respectively; The first steel pipe group and the second steel pipe group are provided in the middle of the top surface of the housing and on one side of the top surface of the housing where the inlet is located, and the third steel pipe group is provided in the middle of the bottom surface of the housing.

4. The carbon dioxide booster pump according to claim 2, characterized in that: A left bearing box connecting the main shaft is installed at the left end of the housing. A blower is provided on the left side of the left bearing box, two groups of thermocouples and two groups of pressure sensors are provided above, a group of constant-level oil cups is provided on the front, and a group of metal thermometers is provided on the side; Inside the left bearing box, a bearing isolator, an oil slinger, a bearing anti-rotation sleeve, two groups of sliding bearings, and a dust-proof disc are sequentially provided from left to right. The dust-proof disc is composed of a moving ring fitting the main shaft and a stationary ring assembled outside the moving ring.

5. The carbon dioxide booster pump according to claim 2, characterized in that: A right bearing box connecting the main shaft is installed at the right end of the housing. Two groups of thermocouples, two groups of pressure sensors are provided above the right bearing box, a group of constant-level oil cups is provided on the front, and a group of metal thermometers is provided on the side; Two groups of dust-proof discs are provided at both ends inside the right bearing box, two groups of sliding bearings are provided between the two groups of dust-proof discs, and a compression ring connecting the thermocouples is provided between the two groups of sliding bearings.

6. The carbon dioxide booster pump according to claim 5, characterized in that: An oil drain plug is provided at the bottom of the sliding bearing, and a gas vent plug is provided at the upper part.

7. The carbon dioxide booster pump according to claim 1, characterized in that: Both the left-handed impeller and the right-handed impeller are integral castings; The throat bushing and the inner bushing are detachably connected.

8. The carbon dioxide booster pump according to claim 3, It is characterized in that: A drive motor is drivingly connected to the main shaft at the end of the right bearing housing to drive the left-handed impeller and the right-handed impeller on the main shaft to rotate, so as to discharge the high-pressure carbon dioxide in a supercritical state entering from the inlet from the outlet.

9. The carbon dioxide booster pump according to claim 1, It is characterized in that: The mechanical seal is a cartridge-type double-ended balanced seal; the seal flushing fluid between the double-ended seals is a hydrodynamic flushing type.

10. The carbon dioxide booster pump according to claim 9, It is characterized in that: The seal flushing fluid between the double-ended seals uses white oil.

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