Vertical carrier gas falling film evaporation condensation cooler

Abstract

The invention relates to the technical field of evaporation condensation cooling, in particular to a vertical carrier gas falling film evaporation condensation cooler which comprises a box body, the box body is connected with a power fan, a shell is arranged in the middle of the box body, and the shell is provided with an inlet and an outlet; the heat exchange pipe is arranged in the shell in the vertical direction, the upper end and the lower end of the heat exchange pipe are connected with the upper side and the lower side of the shell correspondingly, and the portion, making contact with the shell, of the inner wall face of the heat exchange pipe is arranged in a sealed mode; the water supply device is located in the box body, arranged on the upper side of the heat exchange pipe and used for providing cold water for the heat exchange pipe, and the cold water forms a complete liquid film at a pipe opening and flows downwards; the power fan is used for sucking or blowing downstream downwind or upstream upwind into the heat exchange pipe, after heat generated by water vaporization is absorbed, the heat is discharged through the power fan, efficient heat exchange is achieved, and the box body is provided with an air window; the invention solves the technical problems of low condensation efficiency, high cost and high possibility of ice damage caused by overlarge pressure drop when a vertical condenser treats dead steam.

Description

Technical Field

[0001] This invention relates to the field of evaporation and condensation cooling technology, specifically to a vertical carrier gas falling film evaporation and condensation cooler. Background Technology

[0002] An evaporative condenser is a device that utilizes the latent heat of vaporization to achieve efficient heat exchange, and is widely used in refrigeration, air conditioning, chemical, and power industries. Its core principle is that the evaporation of a liquid (such as water or refrigerant) absorbs heat, causing high-temperature gas or vapor to condense into a liquid. The equipment typically consists of cooling tube bundles, a spray system, a fan, and a circulating water pump—the sprayed water forms a water film on the outer surface of the tube bundle, and the fan accelerates airflow, causing the water film to evaporate and carry away heat, thus achieving condensation. The evaporative condenser combines the steam condensation process of a water-cooled heat exchanger with the open-loop evaporative heat exchange process of a cooling tower, integrating the advantages of both water-cooled and air-cooled condensers.

[0003] Current equipment typically uses horizontal evaporative condensers, a mature technology in the evaporative condensation field. Its core advantages lie in functional integration, energy and water conservation, and practical adaptability. It integrates steam condensation and cooling tower cooling functions into one unit, eliminating the need for separate cooling towers and water-cooled condensers. Its compact structure significantly saves installation space and infrastructure investment, making it suitable for various site conditions. Utilizing the latent heat of vaporization for heat transfer, its heat exchange efficiency is significantly superior to purely air-cooled equipment. Furthermore, the circulating water can be recycled and reused in a closed loop, avoiding water waste and demonstrating outstanding water-saving effects. Simultaneously, the equipment has low operating energy consumption, with moderate power requirements for the fan and circulating pump, eliminating the need for complex energy-intensive auxiliary systems. In addition, its simple structural design, mainly composed of horizontal tube bundles, a spray system, a fan, and a circulating water tank, results in fewer components, stable operation, and a low failure rate. Routine maintenance only requires periodic cleaning of the heat exchange tube bundles and replenishment of circulating water, making operation convenient and long-term operating costs controllable. It is widely applicable to industries such as refrigeration, chemicals, and small to medium-sized power plants, making it a classic piece of equipment that balances heat exchange efficiency and economy.

[0004] However, the excessive pressure drop during the condensation process of exhaust steam within the tubes refers to a pressure loss exceeding a reasonable range during the flow and condensation of exhaust steam within the heat exchange tubes of a horizontal evaporative condenser, leading to increased energy loss in steam transport. The core reason is that in a horizontal structure, the heat exchange tubes are arranged horizontally and are relatively long: on the one hand, the steam flow velocity within the tubes is high, and pressure loss occurs due to friction against the tube walls; on the other hand, the condensate produced during condensation easily accumulates within the tubes (and cannot be quickly discharged), forming a thickened liquid film or even localized liquid accumulation, further hindering steam flow and causing a sharp increase in flow resistance. This manifests as an excessive pressure drop during condensation within the tubes, ultimately resulting in a decrease in condensation temperature and a reduction in the heat transfer temperature and concentration differences, wasting energy and affecting condensation efficiency.

[0005] Patent document CN114322591A discloses a high-efficiency evaporative condenser, including a shell. The shell has an upper chamber, a middle chamber, and a lower chamber connected in sequence. The upper chamber has a structure that is larger at the top and smaller at the bottom, and the lower chamber has a structure that is smaller at the top and larger at the bottom. An upper condenser, a middle condenser, and a lower condenser are respectively installed in the upper chamber, the middle chamber, and the lower chamber. The upper condenser, the middle condenser, and the lower condenser are connected in series. A water supply device is provided at the upper end of the shell, and a fan is provided on the shell of the lower chamber. The condenser uses an irregular shape structure with a bowl shape (larger at the top and smaller at the bottom) in the upper chamber and an inverted bowl shape (smaller at the top and larger at the bottom) in the lower chamber, combined with a baffle plate and a perforated plate, to effectively guide airflow and reduce disturbance, while ensuring that cooling water falls evenly to the surface of the heat exchange tubes. The three-stage condenser design (upper / middle / lower) reduces the number of tubes in the middle condenser according to the efficiency difference of different heat exchange stages. Combined with the compact layout of elliptical copper tubes, the material cost of the tubes is significantly reduced.

[0006] The aforementioned condenser improves upon the shortcomings of existing horizontal evaporative condensers, reduces energy waste, and increases condensation efficiency. However, it does not address the issue of excessive pressure drop in horizontal condensers, and the exhaust steam still flows through the pipes, resulting in low condensation efficiency and high costs when processing large quantities of exhaust steam. Summary of the Invention

[0007] This invention provides a vertical carrier gas falling film evaporator-condenser cooler to solve the technical problems of excessive pressure drop in existing vertical condensers when handling exhaust steam, which leads to low condensation efficiency, high cost, and easy icing damage.

[0008] To solve the above problems, the vertical carrier gas falling film evaporator-condenser cooler provided by the present invention adopts the following technical solution: Vertical carrier gas falling film evaporator-condenser cooler, including: The housing is connected to a power fan. The housing has a shell in the middle, which has an inlet for injecting exhaust steam and an outlet for the fluid formed after the exhaust steam condenses. The heat exchange tube is arranged in the shell along the vertical direction. The upper and lower ends of the heat exchange tube are respectively connected to the upper side and the lower side of the shell. The part of the inner wall of the heat exchange tube that contacts the shell is sealed. A water supply device, located inside the tank and arranged above the heat exchange tube, is used to supply cold water to the heat exchange tube. The cold water forms a complete liquid film at the tube opening and flows downward, absorbing the heat condensed by the exhaust steam surrounding the outer wall of the heat exchange tube. The power fan is used to draw or blow downflowing air or upflowing air into the heat exchange tubes. After absorbing the heat from water vaporization, the heat is discharged through the power fan, achieving efficient heat exchange. The housing has a vent corresponding to the power fan.

[0009] The beneficial effects of the above technical solution are as follows: the exhaust steam flows through the shell side (rather than inside the tubes), resulting in a spacious shell side. Combined with the vertical arrangement of the heat exchange tubes, this effectively avoids excessive pressure drop inside the tubes and the pressure drop phenomenon caused by condensate accumulation hindering flow. Flow resistance is effectively reduced, significantly decreasing steam transport energy consumption. Condensate falls along the tube wall under gravity, leaving no residue and keeping the heat exchange surface clean, thus improving condensation efficiency. Cold water forms a complete liquid film at the tube opening and flows downwards, maximizing the contact area between the liquid film and the exhaust steam outside the tubes. The powered fan draws air (with or against the wind), accelerating water vaporization and heat dissipation, creating a dual effect of liquid film heat exchange and forced ventilation, further improving heat exchange efficiency. Finally, the entire condenser combines the advantages of air cooling and water cooling; the improved heat exchange efficiency leads to reduced operating energy consumption, and the subsequent water collection structure reduces water waste.

[0010] Furthermore, the power fan is arranged above the housing, and the air vent is located below the housing, so that the power fan draws upward counter-current air into the heat exchange tube.

[0011] The beneficial effects of the above scheme are: the fan is positioned above to draw upward counter-current airflow, and the air and the descending liquid film inside the pipe form a counter-current flow, which can maintain a large temperature difference and concentration difference between the two, resulting in more complete mass and heat exchange and further improving condensation efficiency; the upward counter-current airflow direction is opposite to the downward direction of the condensate, which avoids the airflow disturbing the integrity of the liquid film, while accelerating the discharge of water vapor inside the pipe, reducing the risk of air blockage, and ensuring continuous and stable heat exchange process.

[0012] Furthermore, the upper side of the water supply device is also equipped with a water collector, which is used to recover water droplets entrained in the exhaust airflow, thereby avoiding water waste and equipment corrosion.

[0013] The beneficial effects of the above solution are: the water collector can effectively prevent equipment corrosion caused by water droplet entrainment, extend the service life of the equipment, and reduce annual maintenance costs; at the same time, it can prevent water droplets from polluting the surrounding environment and improve the environmental friendliness of the equipment.

[0014] Furthermore, the housing has a water storage tank located below the shell, and the water storage tank has a vent on its side. The water storage tank is connected to a water supply pipe extending vertically via a circulation pump, and the upper end of the water supply pipe is connected to the water supply device.

[0015] The beneficial effects of the above scheme are: the water storage tank collects unevaporated cold water, which is then repeatedly supplied to the water supply device via a circulating pump, thus realizing the closed-loop utilization of water resources.

[0016] Furthermore, the water supply device includes a horizontally extending main pipe connected to the water supply pipe, and an outlet is provided on the main pipe.

[0017] Furthermore, there are multiple heat exchange tubes arranged in parallel, and multiple water outlets, so that cold water can enter each heat exchange tube.

[0018] Furthermore, the heat exchange tubes are arranged in a sparse-dense pattern within the shell, and the number of heat exchange tubes changes from sparse to dense in the direction from the inlet of the exhaust steam to the outlet of the fluid formed after the exhaust steam condenses. Alternatively, the heat exchange tubes are arranged in a uniformly spaced manner within the shell.

[0019] The beneficial effects of the above scheme are: the heat exchange tubes at the exhaust steam inlet (high temperature and high humidity) are dispersed, the steam inlet has a large flow rate, and the dispersed arrangement can effectively reduce the resistance to the exhaust steam. The heat exchange tubes at the outlet are densely arranged to effectively ensure the absorption of a large amount of latent heat, thereby ensuring condensation efficiency. This allows for the arrangement of tubes as needed to reduce the amount of tubes used, and can reduce manufacturing costs to a certain extent without reducing performance.

[0020] Furthermore, the water supply pipe is placed outside the casing to avoid encroaching on the space inside the casing, which facilitates the maintenance of the water supply pipe and increases the amount of exhaust steam that can be processed.

[0021] Furthermore, the heat exchange tube is a vertical tube extending up and down, or an inclined tube, or a zigzag tube.

[0022] The beneficial effects of the above solutions are that various pipe types can meet the needs of different installation environments and expand the application range of the equipment.

[0023] Furthermore, the heat exchange tube is fixed to the shell by welding, expansion joint, expansion welding and the same method, or by a sealing ring, to ensure the isolation between the exhaust steam in the shell side and the cold water in the tube side.

[0024] The beneficial effects of the above solution are: completely isolating the shell-side exhaust steam from the tube-side chilled water, avoiding exhaust steam loss due to leakage (ensuring condensation efficiency) and chilled water contamination (reducing the probability of scaling inside the tubes); the welded seal is more robust than the traditional sealing structure, withstands high pressure and high temperature conditions, and has a better sealing effect.

[0025] The beneficial effects of the vertical carrier gas falling film evaporator-condenser cooler provided by this invention are: The vertical carrier gas falling film evaporator-condenser of the present invention adopts a core layout of exhaust steam flowing through the shell side and chilled water flowing through the tube side, combined with the vertical arrangement of heat exchange tubes, which fundamentally solves a series of problems caused by exhaust steam flowing inside the tubes of existing horizontal evaporator-condensers: the shell side space is open and there is no length limitation, the exhaust steam flow path is smooth, and the problems of increased flow resistance and decreased heat transfer efficiency caused by tube wall friction resistance and condensate accumulation in horizontal tube flow are avoided. At the same time, the condensate falls along the shell wall and the outer wall of the heat exchange tubes due to gravity, and there is no accumulation of liquid that hinders the steam flow, which greatly reduces the condensation pressure drop and reduces the energy loss of steam transportation. As cold water descends through the tubes, it forms a uniformly coated liquid film. The condensate from the shell-side exhaust steam is rapidly discharged along the tube wall, resulting in low condensation resistance and high condensation efficiency. The liquid film evaporates along the inner wall of the tube, absorbing condensation heat. Simultaneously, the liquid film and air are in complete counter-current contact for heat and mass transfer, effectively improving heat exchange efficiency. Furthermore, the liquid film flow is stable, eliminating heat exchange failures caused by localized drying or liquid accumulation. Based on this, a rational layout of the power fan and vents enables counter-current heat exchange, further enhancing heat exchange. A water collector recovers entrained water droplets, preventing water waste and equipment corrosion. A circulation system consisting of a water tank and a circulating pump enables water reuse, reducing operating costs. Multiple sets of heat exchange tubes arranged in parallel with varying density adapt to different condensation stages, increasing exhaust steam handling capacity. Externally mounted water supply pipes avoid encroaching on the shell's internal space, facilitating maintenance. Various heat exchange tube designs accommodate different installation scenarios, and welded seals ensure isolation between the shell-side and tube-side media. The overall structure is compact, reliable, and meets energy and water conservation requirements.

[0026] In summary, the entire device represents an improvement and upgrade of the existing condenser, effectively solving the technical problems of excessive pressure drop in vertical condensers when handling exhaust steam, which leads to low condensation efficiency, high cost, and susceptibility to icing damage. Attached Figure Description

[0027] The above and other objects, features, and advantages of exemplary embodiments of the present invention will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of the invention are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein: Figure 1 This is an external schematic diagram of the vertical carrier gas falling film evaporator-condenser cooler provided by the present invention; Figure 2 This is an internal schematic diagram of the vertical carrier gas falling film evaporator-condenser cooler provided by the present invention; Figure 3 This is a schematic diagram of another embodiment where the fan is arranged on the side of the housing (the fan is an exhaust fan). Figure 4 This is a schematic diagram of another embodiment where the fan is arranged on the side of the housing (the fan is a blower).

[0028] Explanation of reference numerals in the attached figures: 1. Housing; 2. Power fan; 3. Shell; 4. Inlet; 5. Heat exchange tube; 6. Air vent; 7. Water collector; 8. Water storage tank; 9. Circulating pump; 10. Water supply pipe; 11. Main pipe; 12. Water outlet. Detailed Implementation

[0029] It should be noted that the main concept of this application is to address the problems of large pressure drop, condensate accumulation, and low heat exchange efficiency in existing horizontal evaporative condensers where exhaust steam flows through the tubes. The core layout is to have exhaust steam flow through the shell side and chilled water flow through the tube side, with the heat exchange tubes arranged vertically to utilize gravity to assist condensate discharge. To enhance heat transfer, a power fan is positioned above the casing, with corresponding air vents below the shell, creating an upward counter-current airflow that counter-currents heat exchange with the descending chilled water inside the tubes. To ensure sufficient contact between the chilled water and exhaust steam, a water supply device adapted to multiple heat exchange tubes is designed, with water supplied through the outlet... The nozzle 12 supplies cold water to the tube to form a uniform liquid film. To achieve water conservation and stable water supply, a water storage tank and a circulating pump are set up to form a cold water circulation system. At the same time, the water supply pipe is placed outside the casing to avoid occupying the effective space inside the shell. To adapt to the characteristic of decreasing gas volume during the condensation of exhaust steam, multiple heat exchange tubes are arranged in parallel from the exhaust steam inlet to the condensate outlet, changing from sparse to dense. The contact parts between the inner wall of the heat exchange tube and the shell are fixed by welding to ensure the medium isolation between the shell side and the tube side. Through the targeted design and cooperation of each component, the efficient condensation, water-saving and reliable performance is achieved.

[0030] The principles and spirit of the present invention will be explained in detail below with reference to several representative embodiments.

[0031] An embodiment of the vertical carrier gas falling film evaporator-condenser cooler provided by the present invention: like Figure 1 and Figure 2 As shown, the vertical carrier gas falling film evaporator-condenser includes a housing 1, a shell 3 in the middle of the housing 1, an inlet 4 for injecting exhaust steam and an outlet for the fluid formed after the exhaust steam is condensed; heat exchange tubes 5 are arranged inside the shell 3, a water supply device is arranged at the top of the shell 3 and a water storage tank 8 is arranged at the bottom.

[0032] In this embodiment, the fluid is condensate. In other embodiments, depending on actual needs, the condenser may not be exhaust steam, but other media that condense to form a fluid.

[0033] The heat exchange tube 5 is arranged in the shell 3 along the vertical direction. The upper and lower ends of the heat exchange tube 5 are connected to the upper side and the lower side of the shell 3, respectively. The part of the inner wall of the heat exchange tube 5 that contacts the shell 3 is sealed. The water supply device is located in the box 1 and arranged on the upper side of the heat exchange tube 5. It is used to supply cold water to the heat exchange tube 5. The cold water forms a complete liquid film at the tube opening and flows downward. The liquid film absorbs the heat of the exhaust steam condensing around the outer wall of the heat exchange tube 5.

[0034] The power fan 2 is used to draw upward counter-current air into the heat exchange tube 5. After absorbing the heat of water vaporization, the air is discharged through the power fan 2 to achieve efficient heat exchange. The lower side of the housing 1 has a wind window 6 corresponding to the power fan 2.

[0035] Exhaust steam flows through the shell side (rather than inside the tubes), providing ample space. Combined with the vertical arrangement of heat exchange tubes 5, this effectively avoids excessive pressure drop inside the tubes and the pressure drop phenomenon caused by condensate accumulation hindering flow. Flow resistance is effectively reduced, and steam transport energy consumption is significantly reduced. Condensate falls along the tube wall of heat exchange tubes 5 under gravity, leaving no liquid residue and keeping the heat exchange surface clean, thus improving condensation efficiency. Cold water forms a uniform liquid film inside the tubes, maximizing the contact area between the liquid film and the exhaust steam outside the tubes. The power fan 2 draws upward counter-current airflow, accelerating water vaporization and heat dissipation.

[0036] In this embodiment, the fan is positioned at the top to draw upward counter-current airflow, creating a counter-current flow between the air and the descending liquid film inside the pipe. This maintains a significant temperature and concentration difference, resulting in more efficient mass and heat exchange and further improving condensation efficiency. Furthermore, the upward counter-current airflow is opposite to the downward flow of the condensate, preventing airflow disturbance of the liquid film's integrity and accelerating the removal of water vapor from the pipe, reducing the risk of air blockage and ensuring a continuous and stable heat exchange process. The power fan 2 can be either an exhaust fan or a blower fan, providing either downward following airflow or upward counter-current airflow. In other embodiments, the power fan 2 can also be positioned on the lower side of the housing 1, with the vent 6 located on the upper side of the housing 1. In this case, the power fan 2 draws downward following airflow to accelerate water vaporization and heat dissipation. Of course, in other embodiments, the power fan can also be positioned on the side of the housing, such as front, back, left, or right.

[0037] like Figure 3 As shown, in another embodiment, the power fan 2 is arranged beside the housing 1. In this case, the power fan 2 is an exhaust fan, which draws downflow from above the housing 1 to accelerate water vaporization and heat dissipation; Figure 4 As shown, the power fan 2 can also be a blower, which blows upward counter-wind to accelerate water vaporization and heat dissipation.

[0038] like Figure 2 As shown, the upper side of the water supply device also has a water collector 7, which is used to collect water droplets entrained in the exhaust airflow, avoiding water waste and equipment corrosion. The water collector 7 can effectively prevent equipment corrosion caused by water droplet entrainment, extend the service life of the equipment, and reduce annual maintenance costs; at the same time, it can prevent water droplets from polluting the surrounding environment, improving the environmental friendliness of the equipment. The outer diameter of the water collector 7 corresponds vertically to the outer diameter of the water supply device to achieve full coverage of the heat exchange tube 5 and ensure the water collection effect.

[0039] It should be noted that the principle of the water collector 7 is that when a humid airflow containing water droplets flows through the water collector 7 at a certain speed, the irregular structure of the water collector 7 forces a change in the direction of airflow (such as turning or detouring). However, due to their own mass and inertia, the water droplets cannot quickly change their trajectory with the airflow and will continue to move in their original direction, eventually colliding with the solid surface of the water collector, thus achieving the separation of the airflow and the water droplets. The water collector 7 is a relatively mature existing technology in this field and will not be described in detail here.

[0040] like Figure 2 As shown, the water storage tank 8 is located below the shell 3. A ventilation window 6 is provided on the side of the water storage tank 8. The water storage tank 8 is connected to a vertically extending water supply pipe 10 via a circulation pump 9. The upper end of the water supply pipe 10 is connected to a water supply device. The water storage tank 8 collects unevaporated cold water, which is then repeatedly supplied to the water supply device via the circulation pump 9, achieving closed-loop utilization of water resources.

[0041] In this embodiment, the water supply device includes a horizontally extending main pipe 11 connected to the water supply pipe 10, with outlets 12 provided on the main pipe 11. There are multiple main pipes 11, arranged in a crisscross pattern, and each main pipe 11 has multiple outlets 12. In other embodiments, nozzles can be installed at the outlets to increase the water supply speed. In this embodiment, the outlets face downwards; in other embodiments, the direction of the outlets is not limited and can face other directions, such as upwards, forming a fountain that cascades into the heat exchange pipes. Of course, in other embodiments, the water supply device can be a faucet connected to the water supply pipe.

[0042] like Figure 2 As shown, there are multiple heat exchange tubes 5 arranged in parallel, and multiple water outlets to allow cold water to enter each heat exchange tube 5. To improve efficiency, the heat exchange tubes 5 are arranged in a sparse-dense configuration within the shell 3, with the number of heat exchange tubes 5 increasing from sparse to dense along the direction from the exhaust steam inlet 4 to the outlet where the fluid formed after exhaust steam condensation flows out. In other embodiments, the heat exchange tubes are arranged at equal intervals and uniformly within the shell.

[0043] The heat exchange tubes 5 at the four exhaust steam inlets (high temperature and high humidity) are arranged in a dispersed manner. The high flow rate at the steam inlet and this dispersed arrangement effectively reduces resistance to the exhaust steam. The heat exchange tubes 5 at the outlet are densely arranged to ensure the absorption of a large amount of latent heat, thereby guaranteeing condensation efficiency. This allows for on-demand tube arrangement, reducing the amount of pipe material used and lowering manufacturing costs to some extent without compromising performance. In other embodiments, the multiple heat exchange tubes 5 can also be evenly distributed inside the shell 3, instead of being arranged in a dispersed manner.

[0044] Furthermore, the heat exchange tube 5 can be a vertically extending tube, an inclined tube, or a zigzag tube. This variety of tube types can meet the needs of different installation environments, expanding the application range of the equipment. The advantage of a vertical tube is that condensate drainage is smoothest, while inclined and zigzag tubes can adapt to space-constrained scenarios, meeting the needs of different installation environments and expanding the application range of the equipment. Moreover, zigzag tubes can extend the heat exchange length and increase the heat exchange area within a limited space without affecting condensate flow, achieving a dual guarantee of space utilization and heat exchange efficiency. In this embodiment, the heat exchange tube 5 is a vertically extending tube. In other embodiments, the shape of the heat exchange tube 5 can be adjusted according to actual needs.

[0045] In this embodiment, the water supply pipe 10 is placed outside the housing 1 to avoid encroaching on the space inside the housing 3, facilitating maintenance of the water supply pipe 10 and increasing the exhaust steam handling capacity. The water supply pipe 10 can be inspected without disassembling the housing, reducing downtime losses and preventing scale buildup and leaks from contaminating the shell-side exhaust steam, thus improving equipment reliability. In other embodiments, the water supply pipe can also be internally mounted.

[0046] In this embodiment, the heat exchange tube 5 is fixed to the shell 3 at the contact point by welding to ensure the isolation between the exhaust steam in the shell side and the cold water in the tube side. This complete isolation of the shell-side exhaust steam and tube-side cold water avoids exhaust steam loss due to leakage (ensuring condensation efficiency) and cold water contamination (reducing the probability of scaling inside the tubes). Welded seals are more robust than traditional sealing structures, withstand high pressure and high temperature conditions, and provide better sealing performance. In other embodiments, the heat exchange tube 5 can also be sealed using other sealing structures, such as sealing rings; or it can be fixed by expansion joints, or by a combination of welding and expansion joints.

[0047] The working principle of the vertical carrier gas falling film evaporator-condenser provided by the present invention is as follows: During operation, exhaust steam is injected into the shell 3 from the inlet 4 and surrounds the outer wall of multiple heat exchange tubes 5 arranged in parallel in the vertical direction. The contact position between the inner wall of the heat exchange tubes 5 and the shell 3 is sealed by welding to ensure that the exhaust steam in the shell side is isolated from the cold water in the tube side. Each heat exchange tube 5 is distributed from sparse to dense in the direction from the exhaust steam inlet 4 to the condensate outlet in the shell 3. The water in the water storage tank 8 below the box 1 is transported to the water supply device on the upper side of the heat exchange tubes 5 by the circulation pump 9 and the water supply pipe 10 placed outside the box 1. The horizontal main pipe 11 of the water supply device provides cold water evenly to each heat exchange tube 5 through multiple water outlets 12. During the process of the cold water descending in the tube, a liquid film is formed covering the inner circumference of the tube, absorbing the heat of the exhaust steam outside the tube from condensation. The power fan 2 above the housing 1 starts, drawing upward counter-current air from the vent 6 on the side of the water tank 8 into the heat exchange tube 5. This airflow forms a counter-current heat exchange with the descending liquid film inside the tube. The airflow absorbs the heat generated by the vaporization of water inside the tube and flows upward. The water droplets carried by the airflow are collected by the water collector 7 on the upper side of the water supply device and then discharged into the environment by the power fan 2. The water formed by the condensation of the exhaust steam after heat exchange with the outer wall of the heat exchange tube 5 inside the housing 3 flows out from the outlet of the housing 3. The unevaporated cold water falls into the water tank 8 for recycling.

[0048] Based on the above description in this specification, those skilled in the art will also understand that the following terms, such as "upper," "lower," "front," "rear," "left," "right," "width," "horizontal," "top," "bottom," "inner," and "outer," which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not explicitly or implicitly suggest that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as limitations on the present invention.

[0049] In addition, in the description of this specification, "multiple" means at least two, such as two, three or more, etc., unless otherwise expressly and specifically defined.

Claims

1. A vertical carrier gas falling film evaporator-condenser cooler, characterized in that, include: The housing is connected to a power fan. The housing has a shell in the middle, which has an inlet for injecting exhaust steam and an outlet for the fluid formed after the exhaust steam condenses. The heat exchange tube is arranged in the shell along the vertical direction. The upper and lower ends of the heat exchange tube are respectively connected to the upper side and the lower side of the shell. The part of the inner wall of the heat exchange tube that contacts the shell is sealed. A water supply device, located inside the tank and arranged above the heat exchange tube, is used to supply cold water to the heat exchange tube. The cold water forms a complete liquid film at the tube opening and flows downward, absorbing the heat condensed by the exhaust steam surrounding the outer wall of the heat exchange tube. The power fan is used to draw or blow downflowing air or upflowing air into the heat exchange tubes. After absorbing the heat from water vaporization, the heat is discharged through the power fan, achieving efficient heat exchange. The housing has a vent corresponding to the power fan.

2. The vertical carrier gas falling film evaporator-condenser cooler according to claim 1, characterized in that: The power fan is arranged above the housing, and the air vent is located below the housing, so that the power fan draws upward counter-current air into the heat exchange tube.

3. The vertical carrier gas falling film evaporator-condenser cooler according to claim 2, characterized in that: The water supply device also has a water collector on its upper side, which is used to collect water droplets entrained in the exhaust airflow to avoid water waste and equipment corrosion.

4. The vertical carrier gas falling film evaporator-condenser cooler according to claim 2 or 3, characterized in that: The box has a water storage tank located below the shell, and the water storage tank has a vent on its side. The water storage tank is connected to a water supply pipe extending vertically via a circulation pump, and the upper end of the water supply pipe is connected to the water supply device.

5. The vertical carrier gas falling film evaporator-condenser cooler according to claim 4, characterized in that: The water supply device includes a horizontally extending main pipe connected to the water supply pipe, and an outlet is provided on the main pipe.

6. The vertical carrier gas falling film evaporator-condenser cooler according to claim 5, characterized in that: The number of heat exchange tubes is multiple, and the heat exchange tubes are arranged in parallel. The number of water outlets is multiple, so that cold water can enter each heat exchange tube.

7. The vertical carrier gas falling film evaporator-condenser cooler according to claim 6, characterized in that: The heat exchange tubes are arranged in a sparse-dense pattern within the shell, and the number of heat exchange tubes changes from sparse to dense in the direction from the inlet of the exhaust steam to the outlet of the fluid formed after the exhaust steam condenses. Alternatively, the heat exchange tubes are arranged in a uniformly spaced manner within the shell.

8. The vertical carrier gas falling film evaporator-condenser cooler according to any one of claims 5 to 7, characterized in that: The water supply pipe is located outside the casing to avoid encroaching on the space inside the casing, which facilitates the maintenance of the water supply pipe and increases the amount of exhaust steam that can be processed.

9. The vertical carrier gas falling film evaporator-condenser cooler according to any one of claims 1 to 3, characterized in that: The heat exchange tube is a vertical tube extending up and down, or an inclined tube, or a zigzag tube.

10. The vertical carrier gas falling film evaporator-condenser cooler according to any one of claims 1 to 3, characterized in that: The heat exchange tubes are fixed to the shell by welding, expansion joint, or a combination of expansion welding and sealing rings to ensure the isolation between the exhaust steam in the shell side and the cold water in the tube side.

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