Vertical evaporation system and vertical heat pump evaporator

Abstract

The application discloses a vertical evaporation system and a vertical heat pump vacuum evaporator. The vertical evaporation system comprises a raw liquid evaporator, an evaporation heat exchanger and a condensation heat exchanger, the evaporation heat exchanger is arranged outside the bottom of the raw liquid evaporator; the bottom of the raw liquid evaporator is provided with a flat heat exchange surface for heat exchange with the evaporation heat exchanger; a scraper capable of scraping the heat exchange surface is arranged close to the heat exchange surface; and the condensation heat exchanger is arranged in the raw liquid evaporator and located at the upper portion of the raw liquid evaporator. With the vertical evaporation system, the heat exchange surface is located at the bottom of the raw liquid evaporator, the heat exchange surface is flat, open and cleaned by the scraper, problems caused by uneven heating and effective heat exchange area change can be effectively avoided, the heat exchange surface is not easy to be polluted, direct observation and cleaning are facilitated, and the quality of the condensed water is good.

Description

Technical Field

[0001] This application relates to the field of evaporation equipment technology, and in particular to a vertical evaporation system and a vertical heat pump vacuum evaporator. Background Technology

[0002] Evaporators are common chemical equipment widely used in chemical, environmental protection, pharmaceutical, food, textile, and energy industries. Evaporators typically utilize the difference in boiling points between water and other solutes in the solution being treated. By heating the water, it boils and vaporizes, escaping from the solution, thus achieving separation of water from other solutes and concentration of the solution. In recent years, evaporators have also been used to treat wastewater, especially highly polluted and concentrated industrial wastewater, such as electroplating wastewater, cleaning wastewater, and emulsified wastewater. They offer advantages such as wide adaptability, short process chains, and high degree of automation.

[0003] However, some drawbacks of existing evaporators limit their effectiveness in treating wastewater and their wider application. For example, see... Figure 1 A common type of evaporator is a horizontal evaporator 900, with the evaporative heat exchanger 901 located in the lower semicircle of the evaporator. As evaporation proceeds, the wastewater 902 within the horizontal evaporator 900 becomes concentrated, and the liquid level gradually decreases. This reduces the effective heat exchange area in contact with the wastewater, for example, from... Figure 1 The evaporator transitions from state A to state B. At this point, the heat from the portion of the heat exchange surface in contact with the wastewater is transferred to the wastewater, but the heat from the portion not in contact with the wastewater is not transferred, resulting in uneven heating. This can lead to dry burning and scaling. Uneven heating of the evaporator can also cause deformation, potentially damaging it and affecting its lifespan. The continuous change in the effective heat exchange area can also destabilize the evaporation process, affecting the quality of the condensate. This is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] This application aims to provide a design for a vertical raw liquid evaporator, in which the heat exchange surface is located at the bottom of the raw liquid evaporator. The heat exchange surface is flat, open, and equipped with a scraper for cleaning, which can effectively avoid problems caused by uneven heating and changes in the effective heat exchange area. It is not easy to get clogged, and it is convenient to directly inspect and clean. The quality of the condensate is also good.

[0005] In a first aspect, this application provides a vertical evaporation system, including a raw liquid evaporator, an evaporative heat exchanger, and a condensing heat exchanger. The evaporative heat exchanger is disposed on the outer side of the bottom of the raw liquid evaporator. The bottom of the raw liquid evaporator has a flat heat exchange surface for heat exchange with the evaporative heat exchanger. A scraper capable of scraping the heat exchange surface is disposed in close contact with the heat exchange surface. The condensing heat exchanger is disposed inside the raw liquid evaporator and located at the top of the raw liquid evaporator.

[0006] In one possible implementation of the first aspect, a liquid level sensor is disposed above the heat exchange surface, and the height difference between the liquid level sensor and the heat exchange surface is less than a preset threshold, for controlling the liquid level in the raw liquid evaporator to not exceed the position of the liquid level sensor.

[0007] In one possible implementation of the first aspect, the system further includes a scraper shaft and a drive motor, wherein the scraper is connected to the scraper shaft and the drive motor is connected to the scraper shaft to drive the scraper shaft to rotate, thereby causing the scraper to rotate and scrape the heat exchange surface.

[0008] In one possible implementation of the first aspect, a condensate tank is provided along the upper wall of the raw liquid evaporator, and the condensate heat exchanger is a coil heat exchanger distributed in a circular pattern in the condensate tank.

[0009] In one possible implementation of the first aspect, the bottom of the raw liquid evaporator is provided with a discharge port.

[0010] Secondly, this application provides a vertical heat pump vacuum evaporator, including any of the possible vertical evaporation systems of the first aspect.

[0011] In one possible implementation of the second aspect, the evaporator further includes a compressor, an expansion valve, and a chilled water heat exchanger; wherein the outlet of the compressor is connected to the inlet of the evaporator heat exchanger, the outlet of the evaporator heat exchanger is connected to the inlet of the expansion valve, the outlet of the expansion valve is connected to the first refrigerant inlet of the chilled water heat exchanger, and the first refrigerant outlet of the chilled water heat exchanger is connected to the inlet of the compressor; the chilled water heat exchanger also has a first chilled water inlet and a first chilled water outlet in communication.

[0012] In one possible implementation of the second aspect, an air-cooled radiator and / or a water-cooled radiator are further provided between the outlet of the evaporative heat exchanger and the inlet of the expansion valve.

[0013] In one possible implementation of the second aspect, the evaporator further includes an ejector and a circulating pump; wherein, the first cold water outlet of the cold water heat exchanger is connected to the liquid inlet of the ejector, the liquid outlet of the ejector is connected to the inlet of the condenser heat exchanger, and the air intake of the ejector is connected to the raw liquid evaporator; the outlet of the condenser heat exchanger is connected to the inlet of the circulating pump, and the outlet of the circulating pump is connected to the first cold water inlet of the cold water heat exchanger.

[0014] In one possible implementation of the second aspect, when a water-cooled radiator is provided between the outlet of the evaporative heat exchanger and the inlet of the expansion valve, the second cold water inlet of the water-cooled radiator is connected to the first cold water outlet of the cold water heat exchanger, and a water-cooled valve is provided on the connecting pipe between the two. The second cold water outlet of the water-cooled radiator is connected to the inlet of the circulating pump.

[0015] In one possible implementation of the second aspect, a liquid storage tank is further provided between the outlet of the condenser heat exchanger and the inlet of the circulating pump. Attached Figure Description

[0016] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram showing the waste liquid level inside a horizontal evaporator during operation.

[0018] Figure 2 This is a structural schematic diagram of one implementation of the vertical evaporation system of this application;

[0019] Figure 3 This is a partial cross-sectional view of the vertical evaporation system of this application;

[0020] Figure 4 This is a structural schematic diagram of one implementation of the vertical heat pump vacuum evaporator of this application;

[0021] Figure 5 This is a schematic diagram of another implementation of the vertical heat pump vacuum evaporator of this application;

[0022] Figure 6 This is a structural schematic diagram of another implementation of the vertical heat pump vacuum evaporator of this application.

[0023] Explanation of reference numerals in the attached figures:

[0024] Figure 1 900 - Horizontal evaporator; 901 - Evaporative heat exchanger; 902 - Wastewater;

[0025] Figures 2 to 6 :

[0026] 100-Original liquid evaporator; 1001-Discharge port; 1002-Heat exchange surface; 1003-Tank wall; 101-Evaporation heat exchanger; 102-Condensation heat exchanger; 103-Condensate tank; 1031-Tank body baffle; 110-Drive motor; 111-Scraper; 112-Support; 113-Scraper shaft; 120-Liquid level sensor;

[0027] 200 - Compressor; 201 - Air-cooled radiator; 202 - Water-cooled radiator; 203 - First heat exchanger; 2031 - Cold water heat exchanger; 204 - Expansion valve;

[0028] 300 - Circulation pump; 301 - Ejector; 310 - Liquid storage tank; 320 - Vacuum pumping line; 330 - Water cooling line; 331 - Water cooling valve. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solutions of the embodiments of this application, the application will be described below in conjunction with the accompanying drawings and specific implementation methods.

[0030] In addition to the aforementioned problems with horizontal evaporators (i.e., dry burning and scaling caused by changes in effective heat exchange area, easy damage to the evaporator, and unstable evaporation process), as evaporation proceeds, the water content in the wastewater gradually decreases, while the amount of pollutants (such as oil or solid particles) or salt increases, which can easily form fouling on the heat exchange surface of the evaporator, leading to a decrease in heat exchange efficiency.

[0031] In conventional evaporators, evaporative heat exchangers are usually coil, shell and tube, or plate heat exchangers. Their heat exchange surfaces are curved and tortuous, making them sensitive to particulate matter and impurities. They are also prone to accumulating dirt, which leads to a decrease in heat exchange efficiency and makes them difficult to inspect and clean.

[0032] This application provides a vertical feed liquid evaporator with the heat exchange surface located at the bottom. During the evaporation and concentration process, even if the amount of waste liquid decreases, the heat exchange surface can always be completely covered by the waste liquid, effectively preventing the problem of dry burning and scaling on part of the heat exchange surface. The effective heat exchange area does not change, the heating is relatively uniform, the evaporation process is more stable, and the problem of easy damage to the evaporator is avoided. Furthermore, the heat exchange surface is flat, open, and equipped with a scraper for cleaning, so dirt is not easy to accumulate and does not easily cause blockage, avoiding the problem of reduced heat exchange efficiency caused by this, and it is also convenient for direct inspection and cleaning.

[0033] See Figures 2 to 3 This application provides a vertical evaporation system, including a raw liquid evaporator 100, an evaporation heat exchanger 101, and a condensation heat exchanger 102.

[0034] The raw liquid evaporator 100 is the main body for boiling and evaporating the raw wastewater. The raw liquid evaporator can have a cylindrical shape, a combination of a cylinder and a cone, etc. This application does not limit the specific shape of the raw liquid evaporator. Optionally, the bottom of the raw liquid evaporator 100 may be provided with a discharge port 1001, from which the concentrate can be discharged after evaporation and concentration are completed.

[0035] Evaporative heat exchanger 101 is located on the outer side of the bottom of raw liquid evaporator 100. The bottom of raw liquid evaporator 100 is at least partially a flat area, which can form a heat exchange surface 1002 for heat exchange with evaporative heat exchanger 101.

[0036] In some implementations, the evaporative heat exchanger can adopt a jacketed structure. High-temperature refrigerant can be introduced into the jacket, while the outer surface, facing the inside of the evaporator, is for wastewater. During the operation of the vertical evaporation system, the high-temperature refrigerant transfers heat to the wastewater through the heat exchange surface, causing it to be heated, evaporated, and concentrated.

[0037] A scraper 111, capable of scraping the heat exchange surface 1002, is tightly attached to the heat exchange surface 1002. The scraper is in close contact with the heat exchange surface, and by relative displacement with the heat exchange surface, it can scrape the heat exchange surface, thereby achieving a cleaning effect. It is understood that one or more scrapers can be provided on the heat exchange surface, and this application does not limit this.

[0038] In some implementations, the heat exchange surface 1002 can be designed as a flat, dish-shaped or conical surface, for example... Figure 2 and Figure 3 As shown. Optionally, the heat exchange surface is a smooth and flat surface, which is relatively easier to clean and less prone to scaling.

[0039] In some implementations, the vertical evaporation system further includes a scraper shaft 113 and a drive motor 110. A scraper 111 is connected to the scraper shaft 113, and the drive motor 110 is also connected to the scraper shaft 113. When the drive motor is operating, it drives the scraper shaft to rotate. Under the drive of the scraper shaft, the scraper rotates on the heat exchange surface, scraping the heat exchange surface and continuously cleaning it. Optionally, the scraper 111 can be connected to the scraper shaft 113 via a bracket 112. Of course, the scraper can also be connected to the scraper shaft in other possible ways, and this application does not limit this.

[0040] A condenser heat exchanger 102 is installed inside the raw liquid evaporator 100 and located at the top of the raw liquid evaporator 100. A cooling medium circulates inside the condenser heat exchanger 102. The steam generated by the evaporation of wastewater rises to the top of the raw liquid evaporator, meets and exchanges heat with the condenser heat exchanger, and transfers the heat to the cooling medium therein, thereby condensing into condensate water, which is collected and output to the outside of the raw liquid evaporator.

[0041] In some implementations, a condensate tank 103 is provided along the upper tank wall 1003 of the feed evaporator 100, and a condensation heat exchanger 102 can be installed in the condensate tank 103. The condensate formed from the steam can be collected in the condensate tank and discharged to the outside of the feed evaporator. For example, see... Figure 2 and Figure 3 The condensate tank 103 can be arranged around the tank wall 1003, and the condenser heat exchanger 102 can be a coil-type heat exchanger with its coils distributed circumferentially within the condensate tank 103. The condenser heat exchanger is positioned close to the tank wall, rather than in the middle of the upper part of the raw liquid heat exchanger. This provides more space for wastewater boiling, reducing foam generation. Furthermore, the wider steam rising channel slows the steam flow rate, reducing the amount of foam and droplets entrained in the steam. Both aspects effectively reduce impurities in the condensate and improve its quality. In addition, when the cooling medium temperature in the condenser heat exchanger is too low, some organic matter or volatile substances entrained in the steam can easily condense and mix with the condensate, affecting its quality. However, by using the aforementioned method, when the cooling medium temperature is too low, it can absorb heat from the environment outside the raw liquid evaporator relatively quickly, reducing the impact of low cooling medium temperature on condensate quality. From another perspective, this also helps improve the quality of the condensate. Of course, this also provides space for the installation of the scraper shaft.

[0042] In some implementations, a trough baffle 1031 can be provided on the tank wall 1003, forming a condensate trough 103 together with the tank wall 1003. The trough baffle 1031 can be placed as close as possible to the tank wall 1003 to form a relatively narrow trough, thereby minimizing the space occupied in the upper part of the raw liquid evaporator 100. This narrow trough and wide flow channel design can provide a relatively larger boiling space and gas flow channel, and when the cooling medium temperature is too low, the cooling medium can more directly absorb heat from the external environment through the tank wall, which helps to further improve the quality of the condensate.

[0043] The cooling medium in a condensing heat exchanger can be either refrigerant or chilled water. Compared to using common refrigerants, using chilled water has several advantages.

[0044] First, a gentler and more uniform condensation temperature helps improve the quality of condensate. Specifically, when wastewater boils, it not only produces water vapor but also other organic or volatile substances with similar boiling points. The lower the temperature of the cooling medium, the easier it is for more organic or volatile substances to condense and mix with the condensate, thus affecting its quality. Common refrigerants (usually gaseous) typically have very low temperatures, 10-20°C lower than the temperature of chilled water (above 0°C); furthermore, the temperature distribution of the refrigerant entering the condensing heat exchanger is uneven, decreasing closer to the expansion valve. This makes it easier for organic or volatile substances to condense and mix into the condensate, affecting its quality. Using chilled water as the cooling medium in a condensing heat exchanger, with its relatively higher and more uniform temperature distribution, helps to obtain better quality condensate.

[0045] Secondly, the refrigerant requires specialized refrigerant piping (such as relatively expensive copper pipes or high-pressure resistant pipes), which places high demands on the piping and increases costs. Using chilled water, on the other hand, can at least make the cooling system more streamlined, more reliable, and cheaper to manufacture, thus providing a basis for the miniaturization of vertical heat pump vacuum evaporators.

[0046] Third, the connection between the dedicated refrigerant piping and the inlet and outlet of the condenser heat exchanger is usually non-removable, while using chilled water eliminates the need for dedicated piping, providing a basis for the flexible connection of the inlet and outlet of the condenser heat exchanger. This allows the condenser heat exchanger to be directly disassembled and cleaned when dirty, and also facilitates maintenance.

[0047] In some implementations, see Figure 2 A liquid level sensor 120 is installed above the heat exchange surface 1002. The height difference between the liquid level sensor 120 and the heat exchange surface 1002 is less than a preset threshold, which is used to control the liquid level in the raw liquid evaporator 100, ensuring that it does not exceed the position of the liquid level sensor 120. In this way, the liquid level in the raw liquid evaporator is always maintained at or below the position of the liquid level sensor. The liquid level sensor can be placed as close to the heat exchange surface as possible, meaning the preset threshold value should be as small as possible. Of course, this application does not limit the specific value of the preset threshold. Using this method, less raw liquid can be stored in the raw liquid evaporator, resulting in a larger liquid volume and heat exchange area ratio, thus accelerating the evaporation and concentration rate. Typically, rapid evaporation and concentration can easily lead to concentration differences between the liquid surface and the heat exchange surface, which can easily cause scaling and crystallization on the heat exchange surface. However, in this implementation, the scraping action of the scraper effectively ensures uniform liquid concentration and a smooth heat exchange surface, preventing scaling and crystallization.

[0048] This application also provides a vertical heat pump vacuum evaporator, which may include any of the aforementioned possible vertical evaporation systems.

[0049] In some implementations, the vertical heat pump vacuum evaporator may also include a heat pump loop for providing heat to the evaporative heat exchanger and recycling the heat.

[0050] See Figure 4 For example, the vertical heat pump vacuum evaporator further includes a compressor 200, an expansion valve 204, and a first heat exchanger 203. The outlet of the compressor 200 is connected to the inlet of the evaporator heat exchanger 101, the outlet of the evaporator heat exchanger 101 is connected to the inlet of the expansion valve 204, the outlet of the expansion valve 204 is connected to the first refrigerant inlet of the first heat exchanger 203, and the first refrigerant outlet of the first heat exchanger 203 is connected to the inlet of the compressor 200, thereby forming a heat pump circuit. The first heat exchanger 203 also has a communicating medium inlet and a medium outlet.

[0051] In this method, the refrigerant is compressed by the compressor into a high-temperature, high-pressure gaseous refrigerant, which is then fed into the evaporator heat exchanger to heat wastewater. In the evaporator heat exchanger, the high-temperature refrigerant transfers heat to the wastewater in the original liquid evaporator, causing the gaseous refrigerant to condense into a liquid refrigerant. The liquid refrigerant then passes through an expansion valve and enters the first heat exchanger. One side of the first heat exchanger contains the refrigerant, and the other side contains the cooling medium. In the first heat exchanger, the liquid refrigerant absorbs heat from the cooling medium and vaporizes into a gaseous refrigerant, while the cooling medium, having absorbed heat, further cools down. The gaseous refrigerant then re-enters the compressor for compression, becoming a high-temperature, high-pressure gaseous refrigerant again, thus completing the heat pump system cycle.

[0052] The first heat exchanger 203 can be arranged near the compressor 200, thereby reducing the length of the refrigerant pipeline, reducing the heat absorbed by the refrigerant from the environment and the superheat after vaporization, and improving the compressor efficiency.

[0053] In some implementations, the vertical heat pump vacuum evaporator may also include a vacuum system to provide a vacuum environment for the feed liquid evaporator.

[0054] In some implementations, the vertical heat pump vacuum evaporator may also include a cooling system for providing a cooling medium for the condenser heat exchanger, the first heat exchanger, and other equipment that may require cooling (such as some equipment in the vacuum system).

[0055] See Figure 4 For example, the vertical heat pump vacuum evaporator also includes a circulating pump 300. The medium inlet of the first heat exchanger 203 is connected to the outlet of the circulating pump 300, the medium outlet of the first heat exchanger 203 is connected to the inlet of the condensing heat exchanger 102, and the outlet of the condensing heat exchanger 102 is directly or indirectly connected to the inlet of the circulating pump 300, thereby forming a cooling circuit.

[0056] As concentration proceeds, when the concentration of the waste liquid in the evaporator is high and the water content is low, the waste liquid cannot fully absorb the heat released by the phase change of the high-temperature refrigerant, which will cause a decrease in the efficiency of the heat pump system. At this time, the gaseous refrigerant needs to be liquefied through additional heat dissipation to ensure the subsequent vaporization effect. Therefore, optionally, an air-cooled radiator 201 and / or a water-cooled radiator 202 can be installed on the refrigerant pipeline between the outlet of the evaporator heat exchanger 101 and the inlet of the expansion valve 204 to further dissipate heat from the refrigerant, allowing the refrigerant to be completely liquefied and have a certain degree of subcooling before passing through the expansion valve.

[0057] The cooling medium in a cooling system can be either refrigerant or chilled water. In the entire heat pump vacuum evaporator, the cooling medium needs to provide cooling for multiple devices; therefore, using refrigerant results in a longer refrigerant circuit, more refrigeration branch circuits, and a greater likelihood of mutual interference. The preceding text primarily discussed the three advantages of using chilled water from the perspective of the cooling medium in the condenser heat exchanger. The following explanation further elaborates on this from the perspective of the entire heat pump vacuum evaporator. Using a chilled water heat exchanger as the primary heat exchanger, replacing conventional refrigerant with chilled water for heat exchange with the refrigerant in the heat pump circuit, reduces the length and complexity of the refrigerant circuit, improves reliability (heat pump circuits are high-pressure), and lowers the risk of refrigerant leakage. Furthermore, it reduces the use of dedicated refrigerant piping throughout the system, making the cooling system more streamlined and cost-effective.

[0058] In addition to serving as a cooling medium, chilled water can also be used in the vacuum system, allowing the cooling and vacuum systems to be combined and simplified into a single cooling and vacuum system, further streamlining the process. This makes the vertical heat pump vacuum evaporator more compact and smaller, requiring less space and allowing it to be placed near the waste generation point for on-site wastewater treatment.

[0059] See Figure 5 In some implementations, the vertical heat pump vacuum evaporator includes a cold water heat exchanger 2031, an ejector 301, and a circulating pump 300. The first heat exchanger is a cold water heat exchanger, with the corresponding medium inlet and outlet referred to as the first cold water inlet and first cold water outlet, respectively. The first cold water outlet of the cold water heat exchanger 2031 is connected to the liquid inlet of the ejector 301, the liquid outlet of the ejector 301 is connected to the inlet of the condenser heat exchanger 102, and the suction port of the ejector 301 is connected to the raw liquid evaporator 100 (i.e., the vacuum line 320). The outlet of the condenser heat exchanger 102 is connected to the inlet of the circulating pump 300, and the outlet of the circulating pump 300 is connected to the first cold water inlet of the cold water heat exchanger 2031. This forms a cooling and vacuum loop. Optionally, a liquid storage tank 310 is also provided between the outlet of the condenser heat exchanger 102 and the inlet of the circulating pump 300 for storing cold water.

[0060] Under the action of the circulating pump, cold water in the storage tank flows into the cold water heat exchanger, where it becomes even colder water after heat exchange. This cold water enters the ejector at its lowest temperature, where its density is higher, resulting in a lower negative pressure or greater suction force after ejection. The negative pressure generated by the ejector draws gas and condensate from the raw liquid evaporator through the vacuum line, creating a lower vacuum environment in the raw liquid evaporator, such as 1 / 20 atmosphere, significantly lowering the boiling point of the wastewater. For example, in some cases, due to the vacuum, wastewater boils at around 30 degrees Celsius. After passing through the ejector, the low-temperature cold water enters the condensation heat exchanger, serving as a cooling medium for the steam, absorbing heat from the steam and condensing it into condensate. After heat exchange, the cold water flows back into the storage tank.

[0061] As concentration progresses, when the concentration of the waste liquid in the evaporator is high and the water content is low, two problems arise: insufficient heat absorption by the wastewater and excessive cooling of the chilled water. These issues can easily lead to a decrease in system efficiency and a low wastewater concentration ratio. Specifically, on the one hand, the waste liquid cannot fully absorb the heat released by the phase change of the high-temperature refrigerant, which will cause a decrease in the efficiency of the heat pump system. On the other hand, when the concentration of the raw liquid is high, the amount of water vapor evaporated is reduced, resulting in less heat being absorbed by the chilled water in the condenser heat exchanger. The chilled water temperature is too low, affecting the operation of the vacuum system. This also indirectly reduces the heat absorbed by the refrigerant in the chilled water heat exchanger, affecting the heat absorption and vaporization of the refrigerant, which will also reduce the efficiency of the heat pump system, causing an energy imbalance in the system. The concentration process cannot continue, affecting further increases in the waste liquid concentration.

[0062] See Figure 6 In some implementations, when a water-cooled radiator 202 is installed between the outlet of the evaporative heat exchanger 101 and the inlet of the expansion valve 204, the second cold water inlet of the water-cooled radiator 202 is connected to the first cold water outlet of the cold water heat exchanger 2031, and a water-cooled valve 331 is installed on the connecting pipe between the two. The second cold water outlet of the water-cooled radiator 202 is connected to the inlet of the circulating pump 300. In other words, the water-cooled radiator also shares the cold water in the cooling and vacuum systems, forming a cooling loop.

[0063] When faced with the aforementioned situation, opening the water-cooling valve allows cold water to enter the water-cooled radiator, absorbing heat from the high-temperature gas-liquid mixture of refrigerant, causing the refrigerant to completely liquefy and improving the efficiency of the heat pump system. Furthermore, because the cold water absorbs heat from the refrigerant, its temperature is additionally raised, allowing the refrigerant to absorb more heat in the cold water heat exchanger, further improving the heat pump efficiency. Through this cooling circuit, the subcooled water is simultaneously heated while the superheated refrigerant is cooled, enabling the system to quickly regain energy balance when the waste liquid evaporates at high concentrations, achieving higher concentrations and thus helping to increase the concentration ratio.

[0064] It should be understood that in the description of this application, the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., generally indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These directions and positional relationships are for ease of description and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0065] It should also be understood that, unless otherwise explicitly specified, the terms "installation," "connection," "assembly," "fixing," etc., in the description of this application should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0066] It should also be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Unless otherwise explicitly specified, "multiple" means two or more.

[0067] The same or similar parts among the various embodiments in this specification can be referred to interchangeably. Different implementations in the above embodiments can be combined with each other as long as they do not contradict each other. The above implementation methods do not constitute a limitation on the scope of protection of this application.

Claims

1. A vertical heat pump vacuum evaporator, characterized in that, Includes a vertical evaporation system, a cooling and vacuum system, and a chilled water heat exchanger; among which, The vertical evaporation system includes a raw liquid evaporator, an evaporative heat exchanger, and a condensing heat exchanger. The evaporative heat exchanger is located only on the outer side of the bottom of the raw liquid evaporator, and refrigerant is used in the jacket of the evaporative heat exchanger. The bottom of the raw liquid evaporator has a flat heat exchange surface for heat exchange with the evaporative heat exchanger. A scraper capable of scraping the heat exchange surface is closely attached to the heat exchange surface. The condensing heat exchanger is located inside the raw liquid evaporator and at the top of the raw liquid evaporator. The cooling and vacuum system includes a circulating pump and an ejector. The outlet of the circulating pump is connected to the first cold water inlet of the cold water heat exchanger, the first cold water outlet of the cold water heat exchanger is connected to the liquid inlet of the ejector, the liquid outlet of the ejector is connected to the inlet of the condenser heat exchanger, and the air inlet of the ejector is connected to the raw liquid evaporator. The outlet of the condenser heat exchanger is connected to the inlet of the circulating pump. The cooling medium circulating in the loop formed by the cooling and vacuum system and the condenser heat exchanger is cold water.

2. The vertical heat pump vacuum evaporator according to claim 1, characterized in that, A liquid level sensor is installed above the heat exchange surface. The height difference between the liquid level sensor and the heat exchange surface is less than a preset threshold, which is used to control the liquid level in the raw liquid evaporator to not exceed the position of the liquid level sensor.

3. The vertical heat pump vacuum evaporator according to claim 1, characterized in that, The vertical evaporation system also includes a scraper shaft and a drive motor. The scraper is connected to the scraper shaft, and the drive motor is connected to the scraper shaft to drive the scraper shaft to rotate, thereby causing the scraper to rotate and scrape the heat exchange surface.

4. The vertical heat pump vacuum evaporator according to any one of claims 1 to 3, characterized in that, A condensate tank is provided along the upper part of the tank wall of the raw liquid evaporator, and the condensate heat exchanger is a coil heat exchanger, which is distributed in a circular manner in the condensate tank.

5. The vertical heat pump vacuum evaporator according to any one of claims 1 to 3, characterized in that, The bottom of the raw liquid evaporator is provided with a discharge port.

6. The vertical heat pump vacuum evaporator according to claim 1, characterized in that, It also includes a compressor and an expansion valve; wherein, the outlet of the compressor is connected to the inlet of the evaporator heat exchanger, the outlet of the evaporator heat exchanger is connected to the inlet of the expansion valve, the outlet of the expansion valve is connected to the first refrigerant inlet of the cold water heat exchanger, and the first refrigerant outlet of the cold water heat exchanger is connected to the inlet of the compressor.

7. The vertical heat pump vacuum evaporator according to claim 6, characterized in that, An air-cooled radiator and / or a water-cooled radiator are also provided between the outlet of the evaporative heat exchanger and the inlet of the expansion valve.

8. The vertical heat pump vacuum evaporator according to claim 7, characterized in that, When a water-cooled radiator is installed between the outlet of the evaporative heat exchanger and the inlet of the expansion valve, the second cold water inlet of the water-cooled radiator is connected to the first cold water outlet of the cold water heat exchanger, and a water-cooled valve is installed on the connecting pipe between the two. The second cold water outlet of the water-cooled radiator is connected to the inlet of the circulating pump.

9. The vertical heat pump vacuum evaporator according to claim 1, characterized in that, A liquid storage tank is also provided between the outlet of the condenser heat exchanger and the inlet of the circulating pump.

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