Phase change heat carrier direct drive heat pump system

Abstract

The application discloses a phase-change heat-carrying direct-drive heat pump system and belongs to the technical field of heat pumps. A flash evaporation unit provides steam for a heat pump unit through a steam channel. The flash evaporation unit comprises a flash evaporation tank body, a liquid inlet pipe is arranged in the flash evaporation tank body, a plurality of parallel liquid distribution heat exchange pipes are arranged on both sides of the liquid inlet pipe, and liquid collection pipelines are connected to both sides of the liquid inlet pipe. A plurality of liquid distribution pipes are connected to a plurality of liquid discharge units arranged on the inner wall of the flash evaporation tank body. The liquid discharge units are used for discharging liquid above the liquid surface in the flash evaporation tank body and discharging liquid below the liquid surface in the flash evaporation tank body. The liquid above and below can be simultaneously flashed through the liquid discharge units. The number of the liquid discharge units above and below is controlled to control the flash evaporation efficiency. The distance between the liquid discharge port of the liquid discharge unit below the liquid surface is controlled to control the flash evaporation efficiency below the liquid surface, the flash evaporation efficiency of the slurry is accurately controlled, and the liquid discharge unit can be adapted to multiple-power flash evaporation equipment, and the adaptability is wide.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of heat pumps, and particularly relates to a phase-change heat-carrying direct-drive heat pump system. BACKGROUND

[0002] Waste heat energy recycling is an important branch in the field of energy saving and environmental protection. China is rich in industrial waste heat resources, especially in coal-fired power generation, steel, non-ferrous, chemical industry, cement, building materials, petroleum and petrochemical industry, light industry and other industries. The waste heat resources account for about 17%-67% of the total fuel consumption, and the recyclable waste heat resources account for about 60% of the total waste heat resources, so the waste heat utilization has great potential. Taking the thermal power industry as an example, a large amount of coal is burned in the operation of a coal-fired thermal power plant, and the generated heat energy is mainly used for power generation and heating, but a large amount of waste heat is discharged into the atmosphere with flue gas after desulfurization. Due to the presence of a large amount of pollutants and impurities in the flue gas, there are serious corrosion and blockage problems, and the waste heat cannot be exchanged by a conventional closed absorption method.

[0003] At present, the slurry flashing position of the flash unit is generally selected to be above the liquid level of the flash tank and below the demister. The slurry is sprayed in this space and is violently flashed in this space. The steam exhaust after flashing has a large number of liquid droplets, which increases the load of the demister, and the flashing efficiency cannot be accurately controlled according to the system load. At the same time, the liquid droplets intercepted by the demister exchange heat with the steam exhaust during the falling process, thereby reducing the steam exhaust temperature and reducing the heat exchange effect. SUMMARY

[0004] The application aims to provide a phase-change heat-carrying direct-drive heat pump system to solve the above problems in the prior art.

[0005] Technical scheme: A phase-change heat-carrying direct-drive heat pump system comprises a flash unit, which provides steam for a heat pump unit through a steam passage. The flash unit comprises a flash tank body, an inlet pipe is arranged in the flash tank body, a plurality of parallel arranged liquid distribution heat exchange pipes are connected with liquid collecting pipes on both sides of the inlet pipe, the liquid collecting pipes are connected with a plurality of liquid discharge units arranged on the inner wall of the flash tank body through a plurality of liquid distribution pipes, respectively, the liquid discharge units are used for discharging liquid to the space above the liquid level in the flash tank body and discharging liquid to the space below the liquid level in the flash tank body.

[0006] Further, a demister is arranged in the flash unit, and the demister is located between the liquid discharge unit and the liquid distribution heat exchange pipe.

[0007] Further, the liquid distribution heat exchange pipes are arranged in a multi-layer rectangular array.

[0008] Further, the liquid discharge unit comprises a buoyancy worm gear reducer, one end of a hollow liquid conveying shaft on the buoyancy worm gear reducer is communicated with the distribution pipe, and the other end of the hollow liquid conveying shaft is connected with the liquid discharge pipe through a liquid passing swing arm.

[0009] Further, the buoyancy worm gear reducer comprises a reducer shell, the hollow liquid conveying shaft is installed in the reducer shell through a bearing, a first gear is arranged on the hollow liquid conveying shaft, a driven shaft and a worm are rotatably arranged in the reducer shell, a second gear and a worm wheel are arranged on the driven shaft, the first gear is in meshing transmission with the second gear, the worm wheel is in meshing transmission with the worm, and a buoyancy driving rack is inserted on the reducer shell and connected with the worm through a gear set.

[0010] Further, the buoyancy driving rack comprises a rack, a float and a counterweight are installed on the rack.

[0011] Further, a communication cavity is arranged in the reducer shell, one end of the hollow liquid conveying shaft is arranged in the communication cavity, a flange for closing the communication cavity is arranged on the reducer shell, and the distribution pipe is installed on the flange.

[0012] Further, a plurality of liquid discharge ports are arranged on the side wall of the liquid discharge pipe.

[0013] Further, a gravity pipe is sleeved on the liquid discharge pipe through a sealing bearing, the closed end of the gravity pipe is axially limited through a bolt, a plurality of horizontal liquid outlets are arranged on the gravity pipe, and a gravity block is arranged on the gravity pipe.

[0014] Further, the flash evaporation unit is provided with a liquid outlet pipe, an inspection opening and a liquid level meter. Advantages

[0015] The liquid discharge unit can realize simultaneous flash evaporation of liquid above and liquid below, control of flash evaporation efficiency by controlling the number of liquid discharge units above and below the liquid, and control of the flash evaporation efficiency of the liquid below by controlling the distance between the liquid discharge port of the liquid discharge unit below and the liquid surface, so as to realize precise control of the flash evaporation efficiency of the slurry, and the liquid discharge unit can be adapted to multiple power flash evaporation equipment and has wide adaptability.

[0016] The application realizes distribution in the flash evaporation tank, and then adapts to multiple liquid discharge units, and the distribution heat exchange pipe can realize temperature increase of flash evaporation exhaust steam passing through the demister to reach the saturation temperature, so as to ensure precise control of the temperature output of the flash evaporation exhaust steam.

[0017] The application realizes the rack one-way driving liquid discharge unit by setting the worm gear meshing transmission mode, the liquid discharge unit cannot drive the rack reversely, and the gravity block is arranged on the gravity pipe to ensure that the horizontal liquid outlet keeps horizontal position at all times and the horizontal liquid outlet direction cannot be changed due to the rotation of the liquid swing arm. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 is the structural schematic diagram of the application;

[0019] Fig. 2 is the structural schematic diagram of the flash unit of the application;

[0020] Fig. 3 is the structural schematic diagram of the liquid discharge unit of the application.

[0021] The figure marks are as follows: the flash unit 1, the flash tank body 11, the liquid inlet pipe 12, the liquid distribution heat exchange pipe 13, the liquid collecting pipe 14, the liquid discharge unit 15, the float worm gear reducer 151, the reducer shell 1511, the first gear 1512, the driven shaft 1513, the worm 1514, the second gear 1515, the worm wheel 1516, the float driving rack 1517, the rack 15171, the float 15172, the counterweight 15173, the gear set 1518, the communication cavity 1519, the flange 1520, the hollow liquid conveying shaft 152, the liquid swing arm 153, the liquid discharge pipe 154, the liquid discharge port 155, the gravity pipe 156, the horizontal liquid outlet 157, the gravity block 158, the liquid distribution pipe 16, the demister 17, the liquid outlet pipe 18, the maintenance opening 19, the liquid level meter 20, the heat pump unit 2, the steam passage 3. DETAILED DESCRIPTION

[0022] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the application. However, it will be apparent to one skilled in the art that the application can be practiced without one or more of these specific details. In other instances, well-known features have not been described in detail to avoid obscuring the application.

[0023] As Figs. 1 to 3As shown, a phase change heat carrying direct drive heat pump system comprises a flash unit 1 providing steam for a heat pump unit 2 through a steam passage 3, the flash unit 1 comprising a flash tank body 11, a liquid inlet pipe 12 arranged in the flash tank body 11, a plurality of parallel arranged liquid distribution heat exchange pipes 13 connected with liquid collecting pipes 14 arranged on both sides of the liquid inlet pipe 12, a plurality of liquid discharge units 15 arranged on the inner wall of the flash tank body 11 and connected with the liquid collecting pipes 14 through a plurality of liquid distribution pipes 16, the liquid discharge units 15 being used for discharging liquid above the liquid surface in the flash tank body 11 and discharging liquid below the liquid surface in the flash tank body 11. A demister 17 is arranged in the flash unit 1 and located between the liquid discharge units 15 and the liquid distribution heat exchange pipes 13. The liquid distribution heat exchange pipes 13 are arranged in a multi-layer rectangular array. The liquid discharge unit 15 comprises a buoyancy worm gear reducer 151, a hollow liquid conveying shaft 152 of the buoyancy worm gear reducer 151 being communicated with the liquid distribution pipe 16 at one end and connected with a liquid discharge pipe 154 through a liquid passing swing arm 153 at the other end. The buoyancy worm gear reducer 151 comprises a reducer shell 1511, the hollow liquid conveying shaft 152 being mounted in the reducer shell 1511 through a bearing, a first gear 1512 being arranged on the hollow liquid conveying shaft 152, a driven shaft 1513 and a worm 1514 being rotatably arranged in the reducer shell 1511, a second gear 1515 and a worm wheel 1516 being arranged on the driven shaft 1513, the first gear 1512 being in meshing transmission with the second gear 1515, the worm wheel 1516 being in meshing transmission with the worm 1514, a buoyancy driving rack 1517 being inserted on the reducer shell 1511, the buoyancy driving rack 1517 being connected with the worm 1514 through a gear set 1518. The buoyancy driving rack 1517 comprises a rack 15171 inserted on the reducer shell 1511, a float 15172 and a counterweight 15173 being mounted on the rack 15171. A communication cavity 1519 is arranged in the reducer shell 1511, one end of the hollow liquid conveying shaft 152 is arranged in the communication cavity 1519, a flange 1520 is arranged on the reducer shell 1511 for closing the communication cavity 1519, and the liquid distribution pipe 16 is mounted on the flange 1520. A plurality of liquid discharge ports 155 are arranged on the side wall of the liquid discharge pipe 154. A gravity pipe 156 is sleeved on the liquid discharge pipe 154 through a sealing bearing, the closed end of the gravity pipe 156 is axially limited through a bolt, a plurality of horizontal liquid outlets 157 are arranged on the gravity pipe 156, and a gravity block 158 is arranged on the gravity pipe 156. An liquid outlet pipe 18, an inspection hole 19 and a liquid level meter 20 are arranged on the flash unit 1.

[0024] The flash evaporation unit 1 is a key component of the entire heat pump system, providing steam to the heat pump unit 2 and playing a crucial role in the waste heat recovery process. It mainly consists of components such as the flash tank body 11, inlet pipe 12, liquid-liquid heat exchange pipe 13, liquid collection pipe 14, drain unit 15, demister 17, outlet pipe 18, inspection port 19, and level gauge 20.

[0025] The flash tank 11, serving as the outer shell of the flash unit 1, provides a closed space for the internal flash evaporation process, ensuring that the slurry undergoes flash evaporation under specific conditions. It can withstand certain pressures and temperatures, guaranteeing the safety and stability of the system. Simultaneously, the tank's structural design provides a foundation for the installation and layout of other components, making the entire flash unit 1 a cohesive whole.

[0026] The inlet pipe 12 is responsible for introducing the slurry to be flash-treated into the flash tank 11. It is the channel through which the slurry enters the flash unit 1, and its position and pipe diameter design affect the slurry's entry velocity and flow distribution. A well-designed inlet pipe 12 can ensure that the slurry enters the subsequent liquid-liquid heat exchanger 13 evenly, providing favorable conditions for the subsequent flash-evaporation process.

[0027] The liquid-liquid heat exchange tubes 13 are arranged in a multi-layer rectangular array and serve multiple functions. Firstly, they evenly distribute the slurry from the inlet pipe 12 to the collecting pipe 14, ensuring a more uniform distribution of the slurry within the flash tank and increasing the contact area between the slurry and the flash space, thus facilitating the full execution of the flash process. Secondly, they also raise the temperature of the flash exhaust steam after passing through the demister 17, bringing it to its saturation temperature. This process not only improves the quality of the flash exhaust steam but also ensures precise control of its temperature output, guaranteeing the efficient operation of the subsequent heat pump unit 2.

[0028] The liquid collection pipe 14 connects the liquid distribution heat exchange pipe 13 and the liquid distribution pipe 16, and serves to collect and transport the slurry. It gathers the slurry distributed by the liquid distribution heat exchange pipe 13 and then transports it to each drainage unit 15 through the liquid distribution pipe 16, ensuring that the slurry can accurately reach the position required for flash evaporation and maintain the continuity and stability of the flash evaporation process.

[0029] The liquid discharge unit 15 is a key component for precise control of flash evaporation efficiency. It can discharge liquid to the space above and below the liquid level in the flash tank 11. By controlling the number of liquid discharge units 15 above and below the liquid level, and the distance of the liquid discharge port of the liquid discharge unit 15 below the liquid level, the flash evaporation efficiency of the slurry can be precisely adjusted. This design makes the liquid discharge unit 15 adaptable to flash evaporation equipment of different power, with wide adaptability. In addition, the liquid discharge unit 15 also includes a floating worm gear reducer 151, a hollow liquid conveying shaft 152, a liquid passing swing arm 153, a liquid discharge pipe 154, a gravity pipe 156 and other sub-components, which work together to further enhance the function of the liquid discharge unit 15.

[0030] The floating worm gear reducer 151 is the core transmission component of the liquid discharge unit 15, mainly composed of a reducer housing 1511, a first gear 1512, a driven shaft 1513, a worm 1514, a second gear 1515, a worm gear 1516, a floating drive rack 1517 and a gear set 1518. It uses the meshing transmission mode of worm and gear to achieve one-way drive of the rack to the liquid discharge unit 15, preventing the liquid discharge unit 15 from driving the rack in reverse, ensuring the stability and reliability of the transmission. At the same time, through the movement of the floating drive rack 1517, the entire liquid discharge unit 15 is driven to work, realizing automatic control of the liquid discharge function.

[0031] The hollow liquid conveying shaft 152 is connected to the liquid distribution pipe 16 at one end and connected to the liquid discharge pipe 154 through the liquid passing swing arm 153 at the other end. It is not only a channel for slurry transportation, but also rotates the liquid discharge pipe 154 under the drive of the floating worm gear reducer 151, thereby adjusting the direction and position of liquid discharge. The hollow design not only meets the demand of slurry transportation, but also reduces the weight of the shaft and reduces energy consumption.

[0032] The liquid passing swing arm 153 connects the hollow liquid conveying shaft 152 and the liquid discharge pipe 154. When the hollow liquid conveying shaft 152 rotates, it drives the liquid discharge pipe 154 to swing, allowing the liquid discharge pipe 154 to discharge liquid at different positions, increasing the flexibility and coverage of liquid discharge, and helping to improve the flash evaporation efficiency.

[0033] The liquid discharge pipe 154 has a plurality of liquid discharge ports 155 on the side wall, which are used to discharge the slurry into the corresponding space in the flash tank 11. The distribution and size of these liquid discharge ports 155 affect the discharge speed and flow of the slurry, and thus affect the flash evaporation efficiency. By reasonably designing the parameters of the liquid discharge ports 155, fine control of the flash evaporation process can be achieved.

[0034] The drainage pipe 154 is equipped with a gravity pipe 156 through a sealing bearing, and the closed end of the gravity pipe 156 is axially limited by a bolt. A plurality of horizontal liquid outlets 157 are arranged on the pipe, and a gravity block 158 is arranged on the pipe. The main function of the gravity pipe 156 is to ensure that the horizontal liquid outlet 157 is always kept in a horizontal position and will not change the drainage direction due to the rotation of the liquid swing arm 153. This design ensures that the slurry can be stably discharged from the horizontal liquid outlet 157, and improves the stability and uniformity of the flash evaporation.

[0035] The demister 17 is located between the liquid drainage unit 15 and the liquid separation heat exchange pipe 13, and is used to remove the liquid droplets carried in the flash evaporation steam. It effectively reduces the content of liquid droplets in the steam exhaust, reduces the load of the subsequent equipment, and improves the quality of the steam. At the same time, it reduces the heat exchange between the liquid droplets and the steam exhaust, avoids the reduction of the steam exhaust temperature, ensures the heat exchange effect, and improves the overall efficiency of the system.

[0036] The liquid outlet pipe 18 is used to discharge the treated liquid in the flash evaporation unit 1, maintain the stable liquid level in the flash evaporation tank 11, and ensure the normal operation of the flash evaporation process. It is a channel for discharging liquid in the flash evaporation unit 1, and the design of its diameter and position needs to consider the flow and pressure of the liquid to ensure that the liquid can be smoothly discharged.

[0037] The maintenance opening 19 provides a channel for workers to enter the inside of the flash evaporation tank 11 to check, maintain and repair the equipment. After the system runs for a period of time, the internal parts can be checked through the maintenance opening 19, and the fault can be found and handled in time to ensure the long-term stable operation of the system.

[0038] The liquid level meter 20 is used to monitor the liquid level height in the flash evaporation tank 11 in real time. Through the feedback information of the liquid level meter 20, the operator can timely adjust the liquid inlet and outlet to maintain the stability of the liquid level in the flash evaporation tank 11, and avoid affecting the flash evaporation effect and the normal operation of the system due to the too high or too low liquid level.

[0039] The steam channel 3 connects the flash evaporation unit 1 and the heat pump unit 2, and is a channel for transporting the steam generated by the flash evaporation unit 1 to the heat pump unit 2. It ensures that the steam can be smoothly transmitted from the flash evaporation unit 1 to the heat pump unit 2, provides a stable heat source for the heat pump unit 2, and is an important connecting component for realizing waste heat recovery. The parameters such as the pipe diameter, material and heat preservation performance of the steam channel 3 will affect the transportation efficiency and heat loss of the steam, and reasonable design of the steam channel 3 can improve the overall performance of the system.

[0040] Working process:

[0041] Slurry input and distribution: The slurry to be treated enters the flash tank 11 through the inlet pipe 12, and the inlet pipe 12 is connected to a plurality of parallelly arranged distribution heat exchange pipes 13 on both sides. These distribution heat exchange pipes 13 are arranged in a multi-layer rectangular array, which can uniformly disperse the slurry. When the slurry flows in the distribution heat exchange pipes 13, it exchanges heat with the surrounding environment, preparing for subsequent flashing. Subsequently, the dispersed slurry flows into the liquid collecting pipe 14 located on both sides of the inlet pipe 12, which serves to converge the slurry, and then the slurry is transported to a plurality of discharge units 15 through a plurality of distribution pipes 16.

[0042] Flashing process: The discharge unit 15 is the key execution component of the flashing process. The floating worm gear reducer 151 in the discharge unit 15 starts to work under the action of the floating driving rack 1517. The floating driving rack 1517 is installed with a float 15172 and a counterweight 15173. When the liquid level in the flash tank 11 changes, the float 15172 changes the floating force, driving the rack 15171 to move. The rack 15171 is connected to the worm 1514 through the gear set 1518, and then drives the worm 1514 to rotate, and through the transmission of the worm wheel 1516 and the driven shaft 1513, the hollow liquid delivery shaft 152 rotates. One end of the hollow liquid delivery shaft 152 is communicated with the distribution pipe 16, and the other end is connected with the discharge pipe 154 through the liquid passing swing arm 153. The rotation of the hollow liquid delivery shaft 152 drives the discharge pipe 154 to swing.

[0043] Liquid flashing: The discharge pipe 154 changes with the change of the liquid level, and then keeps the position of the discharge port 155 to the demister at all times. The discharge port 155 discharges the slurry to the space above the liquid level in the flash tank 11. The slurry is rapidly flashed in this space and becomes steam.

[0044] Sub-liquid flashing: The liquid pipe 154 changes with the change of the liquid level, and then keeps the position of the discharge port 155 to the liquid level at all times. The discharge pipe 154 of part of the discharge units 15 can also discharge the slurry to the space below the liquid level. The newly incoming slurry exchanges heat with the liquid level slurry, and the liquid level slurry reaches the flashing temperature, and then performs flashing to generate steam.

[0045] Steam Treatment and Transportation: The exhaust steam generated by flash evaporation contains droplets, which rise and pass through demister 17. Demister 17 is located between the drain unit 15 and the liquid-distributing heat exchange tubes 13, effectively intercepting droplets in the steam, reducing the moisture content of the steam, and improving steam quality. After demisting, the steam continues to rise and comes into contact with the liquid-distributing heat exchange tubes 13 arranged in a multi-layer rectangular array. The liquid-distributing heat exchange tubes 13 heat the steam to reach its saturation temperature, ensuring precise control of the steam temperature output. Finally, the qualified steam is transported to the heat pump unit 2 through steam channel 3.

[0046] Subsequent processing and system monitoring: During flash evaporation, the remaining liquid in the flash tank 11 is discharged through the outlet pipe 18 to maintain a stable liquid level in the tank. The level gauge 20 monitors the liquid level in the flash tank 11 in real time. If an abnormality occurs, the operator can adjust the inflow or outflow rate based on the information from the level gauge. In addition, the system is equipped with an inspection port 19 to facilitate regular inspection, maintenance, and repair of the components inside the flash unit 1, ensuring long-term stable operation of the system. The steam entering the heat pump unit 2 undergoes heat transfer and enhancement under the action of the heat pump to meet various industrial or domestic heating needs, completing the waste heat recovery process of the entire phase change heat transfer direct-drive heat pump system.

[0047] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.

Claims

1. A phase change heat transfer direct-drive heat pump system, comprising: A flash evaporation unit (1) provides steam to a heat pump unit (2) through a steam channel (3). The flash evaporation unit (1) includes a flash tank (11), an inlet pipe (12) is provided inside the flash tank (11), and the inlet pipe (12) is connected to a collection pipe (14) located on both sides of the inlet pipe (12) through a plurality of parallel liquid-distributing heat exchange pipes (13). The collection pipe (14) is connected to a plurality of drainage units (15) provided on the inner wall of the flash tank (11) through a plurality of liquid-distributing pipes (16). The drainage units (15) are used to drain liquid into the space above the liquid surface inside the flash tank (11) and to drain liquid into the space below the liquid surface inside the flash tank (11). The drainage unit (15) includes: a buoyancy worm gear reducer (151), one end of the hollow infusion shaft (152) on the buoyancy worm gear reducer (151) is connected to the liquid distribution pipe (16), and the other end of the hollow infusion shaft (152) is connected to the drainage pipe (154) through the liquid flow swing arm (153); The buoyancy worm gear reducer (151) includes: a reducer housing (1511), a hollow infusion shaft (152) mounted in the reducer housing (1511) via bearings, a first gear (1512) on the hollow infusion shaft (152), a driven shaft (1513) and a worm (1514) rotatably disposed in the reducer housing (1511), a second gear (1515) and a worm wheel (1516) on the driven shaft (1513), the first gear (1512) meshing with the second gear (1515) for transmission, the worm wheel (1516) meshing with the worm (1514) for transmission, and a buoyancy drive rack (1517) inserted through the reducer housing (1511), the buoyancy drive rack (1517) being connected to the worm (1514) via a gear set (1518).

2. The phase change heat transfer direct-drive heat pump system according to claim 1, characterized in that, The flash evaporation unit (1) is equipped with a demister (17), which is located between the drain unit (15) and the liquid-separating heat exchange tube (13).

3. The phase change heat transfer direct-drive heat pump system according to claim 1, characterized in that, The liquid-liquid heat exchange tube (13) is arranged in a multi-layer rectangular array.

4. The phase change heat transfer direct-drive heat pump system according to claim 1, characterized in that, The buoyancy drive rack (1517) includes: a rack (15171) which is inserted through the reducer housing (1511), and a float (15172) and a counterweight (15173) are mounted on the rack (15171).

5. The phase change heat transfer direct-drive heat pump system according to claim 1, characterized in that, The reducer housing (1511) is provided with a connecting cavity (1519), one end of the hollow infusion shaft (152) is placed in the connecting cavity (1519), the reducer housing (1511) is provided with a flange (1520) for closing the connecting cavity (1519), and the liquid distribution pipe (16) is installed on the flange (1520).

6. The phase change heat transfer direct-drive heat pump system according to claim 1, characterized in that, The drain pipe (154) has multiple drain ports (155) on its side wall.

7. The phase change heat transfer direct-drive heat pump system according to claim 6, characterized in that, The drain pipe (154) is fitted with a gravity pipe (156) through a sealed bearing. The closed end of the gravity pipe (156) is axially limited by bolts. The gravity pipe (156) is provided with multiple horizontal outlets (157). The gravity pipe (156) is also provided with a gravity block (158).

8. The phase change heat transfer direct-drive heat pump system according to claim 1, characterized in that, The flash evaporation unit (1) is equipped with a liquid outlet pipe (18), an inspection port (19), and a liquid level gauge (20).

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