Ultra-high temperature heat pump injection system

Abstract

The present application relates to the technical field of heat pump system, and particularly relates to a super-high temperature heat pump steam injection system. The super-high temperature heat pump steam injection system comprises a condensing mechanism, and the condensing mechanism comprises an adjusting assembly, a plurality of inner tubes and a plurality of U-shaped tubes. The adjusting assembly comprises a fixed plate, a first plate and a second plate, and a connecting cylinder is arranged on the second plate. When the elongation of the inner tube is greater than the elongation of the U-shaped tube after thermal expansion, the distance between the first plate and the second plate is reduced, and the internal space of the connecting cylinder is reduced, so as to reduce the working medium flow into the inner tube. When the elongation of the inner tube is less than the elongation of the U-shaped tube, the working medium flow into the U-shaped tube is reduced, so that the thermal expansion deformation of the inner tube and the U-shaped tube is consistent. The present application provides the super-high temperature heat pump steam injection system to solve the problem that the existing heat exchange tube is damaged due to thermal stress generated by the temperature difference between the inner layer and the outer layer.

Description

Technical Field

[0001] This invention relates to the field of heat pump system technology, and more specifically to an ultra-high temperature heat pump steam injection system. Background Technology

[0002] Currently, there is a strong demand for high-temperature, high-pressure steam in heavy oil thermal recovery, chemical refining, and geothermal displacement, as it is a core heat source for reservoir heating, media displacement, and process heating. In heavy oil extraction, high-temperature steam can reduce crude oil viscosity, improve fluidity, and increase recovery rate. High-pressure saturated steam is also a key heat transfer medium in industrial waste heat recovery and high-temperature heating scenarios.

[0003] The core components of the system include an evaporator, a regenerator, a compressor, a condenser, and an expander. The evaporator absorbs heat from a low-temperature heat source, causing the working fluid to evaporate into low-temperature, low-pressure steam. The compressor performs adiabatic compression, significantly increasing the steam's temperature and pressure. The high-temperature, high-pressure steam enters the condenser, releasing heat to the heated medium (water or heat transfer oil) and condensing into a liquid. The liquid is then depressurized and cooled by the expander before returning to the evaporator, completing the cycle. The regenerator is typically located between the compressor's exhaust side and the expander's inlet or outlet to recover waste heat and improve the energy efficiency ratio.

[0004] The condenser is a key heat exchange device in an ultra-high temperature heat pump steam injection system. Its function is to cool and condense the high-temperature, high-pressure working fluid steam discharged from the compressor into a liquid, releasing a large amount of latent heat of phase change. This heat is used to heat the steam injection medium on the other side (such as boiler feedwater or heat transfer oil), causing it to heat up rapidly until high-temperature steam that meets the steam injection requirements is produced.

[0005] For example, the invention patent with announcement number CN108463682B provides a U-shaped tube heat exchanger. By creating through holes in the tube support plate to allow some fluid to enter the curved tube chamber for heat exchange, and simultaneously using openings in the partition wall to divert the flow around the curved tube chamber, the heat transfer area is increased while the flow velocity inside the curved tube chamber is reduced, thus suppressing U-shaped tube vibration. However, during operation, the inner and outer U-shaped tubes have different temperatures, resulting in inconsistent expansion amounts during thermal expansion. The resulting internal stress can easily damage the U-shaped tubes. Summary of the Invention

[0006] This invention provides an ultra-high temperature heat pump steam injection system to solve the problem of heat exchange tubes being damaged by thermal stress caused by the temperature difference between the inner and outer layers.

[0007] The ultra-high temperature heat pump steam injection system of the present invention adopts the following technical solution: The ultra-high temperature heat pump steam injection system includes a condensing mechanism, which includes an outer cylinder, an adjusting component, multiple inner pipes, and multiple U-shaped pipes. The outer cylinder is horizontally arranged, and its two ends are the first end and the second end, respectively.

[0008] Both the inner tube and the U-shaped tube are located inside the outer cylinder and are arranged along the axial direction of the outer cylinder. Multiple U-shaped tubes are distributed radially along the outer cylinder, with the two ends of each U-shaped tube being an upper end located at the top of the outer cylinder and a lower end located at the bottom of the outer cylinder, both located at the first end of the outer cylinder. Multiple inner tubes are located within the enclosed area of ​​multiple U-shaped tubes.

[0009] The adjusting assembly includes a fixed plate, a first plate, and a second plate distributed along a direction from the first end to the second end of the outer cylinder. The fixed plate is fixedly disposed inside the outer cylinder, while the first and second plates are slidably disposed inside the outer cylinder. The two ends of an inner tube are connected to the fixed plate and the first plate, respectively. The two ends of a U-shaped tube are connected to the fixed plate and the second plate, respectively, and are slidably connected to the first plate. A connecting cylinder is disposed on the side of the second plate closest to the first plate, and the connecting cylinder is slidably connected to the first plate. Multiple inner tubes and connecting cylinders are interconnected.

[0010] The working fluid enters the upper inner tube from the first end of the outer cylinder, flows into the connecting cylinder, and then flows out from the lower inner tube back to the first end of the outer cylinder. The working fluid flows in from the upper port of the U-shaped tube and out from the lower port. When thermal expansion causes a greater elongation of the inner tube, the inner tube pushes the first plate to move more, reducing the distance between the first and second plates, thus reducing the internal space of the connecting cylinder and decreasing the flow rate of the working fluid entering the inner tube. When the elongation of the U-shaped tube is greater, the flow rate of the working fluid entering the U-shaped tube also decreases.

[0011] Furthermore, a steam inlet is provided on the upper side of the outer cylinder, and a steam outlet is provided on the lower side.

[0012] Furthermore, the outer cylinder is equipped with multiple first baffles and multiple second baffles, which are sequentially distributed along the axial direction of the outer cylinder, and the first and second baffles are alternately arranged. A first channel is formed between the lower part of the first baffle and the outer cylinder, and a second channel is formed between the upper part of the second baffle and the outer cylinder. Steam entering the outer cylinder from the steam inlet passes through the multiple first channels and multiple second channels in sequence before being discharged from the steam outlet.

[0013] Furthermore, the outer cylinder includes a first end cylinder, a middle cylinder, and a last end cylinder. The first end cylinder, middle cylinder, and last end cylinder are distributed sequentially from the first end to the second end of the outer cylinder. The middle cylinder connects the first end cylinder and the last end cylinder. The inner tube and U-shaped tube are located inside the middle cylinder and the last end cylinder, and the steam inlet and steam outlet are both located on the middle cylinder.

[0014] Furthermore, the first end cylinder has an inlet chamber and an outlet chamber, with the inlet chamber located above the outlet chamber. The inlet chamber connects to the inner tube located in the upper part of the middle cylinder and the upper end of the U-shaped tube. The outlet chamber connects to the inner tube located in the lower part of the middle cylinder and the lower end of the U-shaped tube.

[0015] Furthermore, the first end cylinder has a working fluid inlet and a working fluid outlet, with the working fluid inlet connected to the feed chamber and the working fluid outlet connected to the discharge chamber.

[0016] Furthermore, an annular groove is formed on the side of the first plate near the second plate. The annular groove and the connecting cylinder are coaxially arranged, with the open end of the connecting cylinder facing the first plate. The connecting cylinder is slidably disposed in the annular groove.

[0017] Furthermore, a sealing ring is provided at the mating position of the annular groove and the connecting cylinder.

[0018] Furthermore, the ultra-high temperature heat pump steam injection system also includes an evaporator, a regenerator, a compressor, and an expander. The evaporator and the regenerator are connected, the regenerator and the compressor are connected, the compressor and the working fluid inlet are connected, the working fluid outlet and the regenerator are connected, the regenerator and the expander are connected, and the expander and the evaporator are connected, forming a closed-loop circuit.

[0019] Furthermore, a bracket is provided on the outer wall of the middle cylinder to support the middle cylinder.

[0020] The beneficial effects of this invention are as follows: The ultra-high temperature heat pump steam injection system of this invention, through the set adjustment components, adapts to the deformation of the inner tube and the U-shaped tube by moving the first plate and the second plate. When the elongation of the inner tube due to thermal expansion is greater than that of the U-shaped tube, the distance between the first plate and the second plate decreases, and the internal space of the connecting cylinder decreases accordingly, thereby reducing the flow rate of the working fluid entering the inner tube and ensuring that the thermal expansion deformation of the inner tube and the U-shaped tube are consistent. When the elongation of the inner tube due to thermal expansion is less than that of the U-shaped tube, the distance between the first plate and the second plate increases, and the internal space of the connecting cylinder increases, thereby increasing the flow rate of the working fluid entering the inner tube, similarly ensuring that the thermal expansion deformation of the inner tube and the U-shaped tube are consistent.

[0021] This condensation mechanism can adaptively adjust the working fluid distribution ratio based on the real-time temperature difference between the U-tube and the inner tube, accurately balance the thermal expansion difference between the U-tube and the inner tube, completely avoid structural internal stress caused by uneven pipeline temperature and inconsistent expansion deformation, effectively prevent problems such as deformation and pulling, fatigue damage between the U-tube and the inner tube, and continuously ensure efficient and stable heat exchange performance while stabilizing the equipment's operating conditions. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the condensation mechanism of the ultra-high temperature heat pump steam injection system provided in an embodiment of the present invention; Figure 2 A side view of the condensing mechanism of the ultra-high temperature heat pump steam injection system provided in an embodiment of the present invention; Figure 3 for Figure 2 Sectional view along the middle AA direction; Figure 4 for Figure 3 Enlarged view of point B in the middle; Figure 5 An exploded view of the condensation mechanism of the ultra-high temperature heat pump steam injection system provided in an embodiment of the present invention; Figure 6 A schematic diagram of another embodiment of the condensation mechanism of the ultra-high temperature heat pump steam injection system provided in this invention; Figure 7 This is a schematic diagram of an ultra-high temperature heat pump steam injection system provided in an embodiment of the present invention.

[0024] In the diagram: 100, Evaporator; 200, Regenerator; 300, Compressor; 400, Outer cylinder; 401, Working fluid inlet; 402, Working fluid outlet; 404, Steam inlet; 405, Steam outlet; 408, U-tube; 409, Inner tube; 410, First plate; 411, Second plate; 412, Fixed plate; 413, Connecting cylinder; 420, First baffle; 430, Second baffle; 440, Feed chamber; 441, Discharge chamber; 450, Support; 500, Expander; 600, Outer tube; 610, Adjustment chamber; 620, Movable disc; 630, Connecting ring. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Reference Figures 1 to 7 As shown, the ultra-high temperature heat pump steam injection system provided in this embodiment of the invention includes a condensing mechanism, which comprises an outer cylinder 400, an adjusting component, multiple inner pipes 409, and multiple U-shaped pipes 408. The outer cylinder 400 is horizontally arranged, with its two ends being a first end and a second end, respectively.

[0027] Both the inner tube 409 and the U-shaped tube 408 are located within the outer cylinder 400 and are arranged axially along the outer cylinder 400. Multiple U-shaped tubes 408 are radially distributed along the outer cylinder 400, and their height gradually increases as they approach the axis of the outer cylinder 400. The two ends of each U-shaped tube 408 are an upper end located at the top of the outer cylinder 400 and a lower end located at the bottom of the outer cylinder 400, both at the first end of the outer cylinder 400. Multiple inner tubes 409 are situated within the area enclosed by multiple U-shaped tubes 408.

[0028] The adjustment assembly includes a fixed plate 412, a first plate 410, and a second plate 411 distributed along the direction from the first end to the second end of the outer cylinder 400. The fixed plate 412 is fixedly disposed inside the outer cylinder 400, and the first plate 410 and the second plate 411 are slidably disposed inside the outer cylinder 400.

[0029] The inner tube 409 is connected to a fixed plate 412 and a first plate 410 at both ends. The U-shaped tube 408 is connected to a fixed plate 412 and a second plate 411 at both ends, and passes through the first plate 410 and slides with it. A connecting cylinder 413 is provided on the side of the second plate 411 near the first plate 410, and the connecting cylinder 413 is slidably connected to the first plate 410. Multiple inner tubes 409 and connecting cylinders 413 are connected in series.

[0030] The working fluid enters the upper inner tube 409 from the first end of the outer cylinder 400, flows into the connecting cylinder 413, and then flows from the lower inner tube 409 back to the first end of the outer cylinder 400 before being discharged. The working fluid flows in from the upper port and out from the lower port of the U-shaped tube 408. When the inner tube 409 and the U-shaped tube 408 expand due to heat, they adapt to the deformation by moving the first plate 410 and the second plate 411. When the elongation of the inner tube 409 due to heat expansion is greater than that of the U-shaped tube 408, the movement of the first plate 410 driven by the inner tube 409 is greater than the movement of the second plate 411 driven by the U-shaped tube 408. This reduces the distance between the first plate 410 and the second plate 411, thereby reducing the internal space of the connecting cylinder 413 and decreasing the flow rate of the working fluid entering the inner tube 409, thus ensuring that the thermal expansion deformation of the inner tube 409 and the U-shaped tube 408 is consistent.

[0031] When the elongation of the U-shaped tube 408 due to thermal expansion is greater than that of the inner tube 409 due to thermal expansion, the movement of the second plate 411 driven by the U-shaped tube 408 is greater than the movement of the first plate 410 driven by the inner tube 409. This increases the distance between the second plate 411 and the first plate 410, thereby increasing the internal space of the connecting cylinder 413. This increases the flow rate of the working fluid entering the inner tube 409 and decreases the flow rate of the working fluid entering the U-shaped tube 408, thus ensuring that the thermal expansion deformation of the U-shaped tube 408 and the inner tube 409 remains consistent.

[0032] The condensation mechanism can adaptively adjust the working fluid distribution ratio based on the real-time temperature difference between the U-tube 408 and the inner tube 409, accurately balance the thermal expansion difference between the U-tube 408 and the inner tube 409, completely avoid the structural internal stress caused by uneven pipeline temperature and inconsistent expansion deformation, effectively prevent problems such as deformation and tension and fatigue damage between the U-tube 408 and the inner tube 409, and continuously ensure efficient and stable heat exchange performance while stabilizing the equipment operation.

[0033] Furthermore, by setting the first plate 410 and the second plate 411, the problems in existing floating head condensers, such as the large connection area between the floating head cover and the tube sheet flange leading to an enlarged shell, the formation of an annular bypass channel between the tube bundle and the shell, and the fact that some fluid does not participate in heat exchange, are effectively solved.

[0034] In other embodiments, the condensation mechanism includes an outer cylinder 400, an adjustment assembly, multiple inner tubes 409, and multiple outer tubes 600. Both the inner tubes 409 and the outer tubes 600 are straight tubes, which are less prone to clogging and easier to clean. The adjustment assembly includes a fixed plate 412, a first plate 410, and a second plate 411. The two ends of the outer tubes 600 are respectively connected to the fixed plate 412 and the second plate 411, and are slidably connected to the first plate 410. The side of the second plate 411 near the second end of the outer cylinder 400 forms an adjustment cavity 610 with the outer cylinder 400, and the multiple outer tubes 600 communicate with the adjustment cavity 610. Sealing rings are provided at the connections between the first plate 410 and the second plate 411 and the outer cylinder 400. The working fluid enters the upper outer tube 600 from the first end of the outer cylinder 400, flows into the adjustment cavity 610, and then flows from the lower outer tube 600 back to the first end of the outer cylinder 400 before being discharged.

[0035] In another embodiment, the condensation mechanism includes an outer cylinder 400, an adjustment assembly, multiple inner tubes 409, and multiple outer tubes 600, all of which are straight tubes. The adjustment assembly includes a fixed plate 412, a movable disc 620, and a connecting ring 630. The movable disc 620 and the connecting ring 630 are coaxially arranged with the outer cylinder 400. The fixed plate 412 and the movable disc 620 are distributed sequentially from the first end to the second end of the outer cylinder 400. The two ends of the inner tubes 409 are respectively connected to the fixed plate 412 and the movable disc 620. The connecting ring 630 is located outside the movable disc 620, and the two ends of the outer tubes 600 are respectively connected to the fixed plate 412 and the connecting ring 630.

[0036] An adjusting cavity 610 is formed between the movable disc 620 near the first end of the outer cylinder 400 and the connecting ring 630 near the first end of the outer cylinder 400. Multiple outer tubes 600 communicate with the adjusting cavity 610. A connecting cylinder 413 is fixedly mounted on the movable disc 620, located within the adjusting cavity 610, and multiple inner tubes 409 communicate with the connecting cylinder 413. A sealing ring is provided between the movable disc 620 and the connecting ring 630, and a sealing ring is provided between the connecting ring 630 and the outer cylinder 400.

[0037] Part of the working fluid enters the upper outer tube 600 from the first end of the outer cylinder 400, flows into the regulating chamber 610, and then flows from the lower outer tube 600 back to the first end of the outer cylinder 400 before being discharged. Another part of the working fluid enters the upper inner tube 409 from the first end of the outer cylinder 400, flows into the connecting cylinder 413, and then flows from the lower inner tube 409 back to the first end of the outer cylinder 400 before being discharged.

[0038] In this embodiment, the outer cylinder 400 has a steam inlet 404 on the upper side and a steam outlet 405 on the lower side.

[0039] In this embodiment, a plurality of first baffles 420 and a plurality of second baffles 430 are provided inside the outer cylinder 400. The first baffles 420 and the second baffles 430 are sequentially distributed along the axial direction of the outer cylinder 400, and the first baffles 420 and the second baffles 430 are alternately arranged. A first channel is formed between the lower part of the first baffle 420 and the outer cylinder 400, and a second channel is formed between the upper part of the second baffle 430 and the outer cylinder 400. Both the first baffles 420 and the second baffles 430 have a plurality of through holes. Steam entering the outer cylinder 400 from the steam inlet 404 passes sequentially through the plurality of first channels, the plurality of second channels, and the plurality of through holes before exiting from the steam outlet 405.

[0040] In this embodiment, the outer cylinder 400 includes a first end cylinder, a middle cylinder, and a last end cylinder. The first end cylinder, the middle cylinder, and the last end cylinder are distributed sequentially from the first end to the second end of the outer cylinder 400. The middle cylinder connects the first end cylinder and the last end cylinder. The inner tube 409 and the U-shaped tube 408 are located inside the middle cylinder and the last end cylinder, and the steam inlet 404 and the steam outlet 405 are both located on the middle cylinder.

[0041] In this embodiment, the first end cylinder has a feed chamber 440 and a discharge chamber 441, with the feed chamber 440 located above the discharge chamber 441. The feed chamber 440 connects to the upper port of the inner tube 409 and the upper port of the U-shaped tube 408 located in the upper part of the middle cylinder. The discharge chamber 441 connects to the lower port of the inner tube 409 and the lower port of the U-shaped tube 408 located in the lower part of the middle cylinder.

[0042] In this embodiment, the first end cylinder has a working fluid inlet 401 and a working fluid outlet 402, and the working fluid inlet 401 is connected to the feed chamber 440. The working fluid outlet 402 is connected to the discharge chamber 441.

[0043] The working medium enters the feed chamber 440 through the working medium inlet 401. A portion of the working medium flows into the U-shaped tube 408 through the upper port, then enters the discharge chamber 441 through the lower port of the U-shaped tube 408, and is finally discharged outwards. The other portion of the working medium in the feed chamber 440 enters the inner tube 409 located at the upper part of the middle cylinder, then flows into the connecting cylinder 413, then enters the inner tube 409 located at the lower part of the middle cylinder, and finally enters the discharge chamber 441 and is discharged outwards.

[0044] In this embodiment, the first plate 410 has an annular groove on the side near the second plate 411. The annular groove and the connecting cylinder 413 are coaxially arranged. The open end of the connecting cylinder 413 faces the first plate 410, and the connecting cylinder 413 is slidably disposed in the annular groove.

[0045] In this embodiment, a sealing ring is provided at the mating position of the annular groove and the connecting cylinder 413 to prevent liquid leakage from the connecting cylinder 413.

[0046] In this embodiment, the ultra-high temperature heat pump steam injection system further includes an evaporator 100, a regenerator 200, a compressor 300, and an expander 500. The evaporator 100 and the regenerator 200 are connected, the regenerator 200 and the compressor 300 are connected, the compressor 300 and the working fluid inlet 401 are connected, the working fluid outlet 402 and the regenerator 200 are connected, the regenerator 200 and the expander 500 are connected, and the expander 500 and the evaporator 100 are connected, forming a closed-loop circulation circuit.

[0047] Low-temperature waste heat enters the evaporator 100, where it absorbs heat and evaporates into low-pressure steam. This low-pressure steam then enters the regenerator 200, where it exchanges heat with the low-pressure working fluid exiting the expander 500, achieving preliminary preheating and thus recovering some waste heat. The preheated steam enters the compressor 300, where it is compressed into high-temperature, high-pressure superheated steam. This high-temperature, high-pressure steam enters the outer cylinder 400, where it releases heat and cools down, becoming medium-temperature, medium-pressure steam. After exiting the outer cylinder 400, it re-enters the regenerator 200, where it exchanges heat with the low-temperature steam exiting the evaporator 100, further reducing its own temperature and releasing heat, while simultaneously preheating the steam exiting the evaporator 100. The working fluid, having undergone heat exchange, flows into the expander 500, expands, performs work, and reduces its pressure, ultimately returning to the evaporator 100, continuously completing waste heat recovery and energy recycling.

[0048] In this embodiment, a bracket 450 is provided on the outer wall of the middle cylinder, and the bracket 450 is used to support the middle cylinder.

[0049] Working process: The working medium enters the feed chamber 440 through the working medium inlet 401. A portion of the working medium flows into the U-shaped tube 408 through the upper port, then enters the discharge chamber 441 through the lower port of the U-shaped tube 408, and is finally discharged outwards. The other portion of the working medium in the feed chamber 440 enters the inner tube 409 located at the upper part of the middle cylinder, then flows into the connecting cylinder 413, then enters the inner tube 409 located at the lower part of the middle cylinder, and finally enters the discharge chamber 441 and is discharged outwards.

[0050] Steam enters the outer pipe 600 through the steam inlet 404, flows through multiple first channels and multiple second channels in sequence, and finally exits from the steam outlet 405. During this process, the steam exchanges heat with the U-shaped tube 408 and the inner pipe 409.

[0051] As the U-shaped tube 408 and inner tube 409 expand due to temperature increase after the working medium is introduced, and as they expand and elongate as a whole, the inner tube 409 causes the first plate 410 to move away from the fixed plate 412, while the U-shaped tube 408 causes the second plate 411 to move away from the fixed plate 412. The inner tube 409 and U-shaped tube 408 adapt to their own deformation through the movement of the first plate 410 and the second plate 411.

[0052] When the temperature of the inner tube 409 is higher than that of the U-shaped tube 408, the elongation of the inner tube 409 is greater than that of the U-shaped tube 408. At this time, the inner tube 409 will drive the first plate 410 to move closer to the second plate 411. The distance between the first plate 410 and the second plate 411 will decrease, which will reduce the internal space of the connecting cylinder 413 and increase the resistance to the working fluid. This will reduce the flow rate of the working fluid entering the inner tube 409 and guide more working fluid into the U-shaped tube 408. By automatically adjusting the distribution ratio of the two working fluids, the thermal expansion of the inner tube 409 and the U-shaped tube 408 will tend to be balanced and unified, effectively optimizing the overall heat exchange efficiency.

[0053] When the temperature of the U-tube 408 is higher than that of the inner tube 409, the elongation of the U-tube 408 is greater than that of the inner tube 409. The distance between the first plate 410 and the second plate 411 increases, the internal space of the connecting cylinder 413 increases, and the resistance to the working fluid decreases, which can greatly increase the amount of working fluid entering the inner tube 409, supplement the working fluid supply of the inner tube 409, and make the thermal expansion deformation of the U-tube 408 and the inner tube 409 consistent.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An ultra-high temperature heat pump steam injection system, characterized in that: The device includes a condensation mechanism, which comprises an outer cylinder, an adjustment assembly, multiple inner tubes, and multiple U-shaped tubes. The outer cylinder is horizontally positioned, with its two ends being a first end and a second end, respectively. The inner tubes and U-shaped tubes are both located within the outer cylinder and are arranged along its axial direction. The multiple U-shaped tubes are radially distributed along the outer cylinder, with their two ends being an upper end at the top and a lower end at the bottom of the outer cylinder, both located at the first end of the outer cylinder. The multiple inner tubes are situated within the area enclosed by the multiple U-shaped tubes. The adjustment assembly includes a fixed plate, a first plate, and a second plate distributed along a direction from the first end to the second end of the outer cylinder; the fixed plate is fixedly disposed inside the outer cylinder, and the first plate and the second plate are slidably disposed inside the outer cylinder; the two ends of the inner tube are respectively connected to the fixed plate and the first plate; the two ends of the U-shaped tube are respectively connected to the fixed plate and the second plate, and are slidably connected to the first plate; a connecting cylinder is disposed on the side of the second plate near the first plate, and the connecting cylinder is slidably connected to the first plate; multiple inner tubes and connecting cylinders are connected in communication; The working fluid enters the upper inner tube from the first end of the outer cylinder, flows into the connecting cylinder, and then flows from the lower inner tube back to the first end of the outer cylinder for discharge. The working fluid flows in from the upper port of the U-shaped tube and flows out from the lower port. When the inner tube elongates more due to thermal expansion, the inner tube pushes the first plate to move more, which reduces the distance between the first and second plates, thereby reducing the internal space of the connecting cylinder and decreasing the flow rate of the working fluid entering the inner tube. When the U-shaped tube elongates more, the flow rate of the working fluid entering the U-shaped tube also decreases.

2. The ultra-high temperature heat pump steam injection system according to claim 1, characterized in that: A steam inlet is located on the upper side of the outer cylinder, and a steam outlet is located on the lower side.

3. The ultra-high temperature heat pump steam injection system according to claim 2, characterized in that: The outer cylinder is provided with multiple first baffles and multiple second baffles, which are distributed sequentially along the axial direction of the outer cylinder, and the first baffles and second baffles are alternately arranged; a first channel is formed between the lower part of the first baffle and the outer cylinder, and a second channel is formed between the upper part of the second baffle and the outer cylinder; steam entering the outer cylinder from the steam inlet passes through multiple first channels and multiple second channels in sequence and is discharged from the steam outlet.

4. The ultra-high temperature heat pump steam injection system according to claim 2, characterized in that: The outer cylinder includes a first end cylinder, a middle cylinder, and a last end cylinder; the first end cylinder, the middle cylinder, and the last end cylinder are distributed sequentially from the first end to the second end of the outer cylinder; the middle cylinder connects the first end cylinder and the last end cylinder; the inner tube and the U-shaped tube are located inside the middle cylinder and the last end cylinder, and the steam inlet and the steam outlet are both located on the middle cylinder.

5. The ultra-high temperature heat pump steam injection system according to claim 4, characterized in that: The first end cylinder has a feeding chamber and a discharging chamber, with the feeding chamber located above the discharging chamber. The feeding chamber is connected to the upper end of the inner tube in the upper part of the middle cylinder and the upper end of the U-shaped tube. The discharging chamber is connected to the lower end of the inner tube in the lower part of the middle cylinder and the lower end of the U-shaped tube.

6. The ultra-high temperature heat pump steam injection system according to claim 5, characterized in that: The first end cylinder has a working fluid inlet and a working fluid outlet. The working fluid inlet is connected to the feed chamber, and the working fluid outlet is connected to the discharge chamber.

7. The ultra-high temperature heat pump steam injection system according to claim 1, characterized in that: An annular groove is provided on the side of the first plate near the second plate. The annular groove and the connecting cylinder are coaxially arranged. The open end of the connecting cylinder faces the first plate, and the connecting cylinder is slidably disposed in the annular groove.

8. The ultra-high temperature heat pump steam injection system according to claim 7, characterized in that: A sealing ring is provided at the mating position of the annular groove and the connecting cylinder.

9. The ultra-high temperature heat pump steam injection system according to claim 6, characterized in that: It also includes an evaporator, a regenerator, a compressor, and an expander; the evaporator and the regenerator are connected, the regenerator and the compressor are connected, the compressor and the working fluid inlet are connected, the working fluid outlet and the regenerator are connected, the regenerator and the expander are connected, and the expander and the evaporator are connected, forming a closed loop.

10. The ultra-high temperature heat pump steam injection system according to claim 4, characterized in that: A bracket is installed on the outer wall of the middle cylinder to support it.

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