Water-cooling and evaporative cooling integrated condensing device

Abstract

This invention relates to the field of evaporative condensation cooling technology, specifically to a water-cooled-evaporative integrated condensation device. The device includes a shell, an evaporative heat exchange tube bundle within the shell, a power fan, and a spray assembly. The shell has a steam inlet and a condensate outlet. The power fan drives air to flow upwards within the evaporative heat exchange tube bundle. The shell contains a water-cooled heat exchange tube bundle with its inlet end lower and connected to a water source, and its outlet end higher and connected to the spray assembly. Steam preheats the cold water in the water-cooled heat exchange tube bundle, and the heated high-temperature spray water enters the evaporative heat exchange tube bundle along the spray assembly, forming a film from top to bottom. This creates a gradient heat exchange with the upward-flowing air to increase the outlet enthalpy. This invention solves the technical problem in existing technologies where the low water-air heat and mass transfer rate at the top of the condenser leads to a low overall exhaust enthalpy and poor air heat carrying capacity, requiring increased fan operating volume and significantly increasing fan energy consumption.

Description

Technical Field

[0001] This invention relates to the field of evaporation and condensation cooling technology, specifically to an integrated water-cooled and evaporative cooling condensation device. Background Technology

[0002] As a key heat exchange device in thermal power generation systems, the performance of the condenser directly affects the efficiency of the entire power generation system. Currently, commonly used condensers in industry are mainly divided into three categories: water-cooled condensers, air-cooled condensers, and evaporative condensers. Water-cooled condensers rely on circulating water inside the tubes to remove the latent heat of steam condensation, resulting in high heat transfer efficiency, but they suffer from high circulating water consumption and high investment in subsequent cooling equipment. Air-cooled condensers rely on forced convection heat exchange between air and finned tubes to remove heat; due to the low heat transfer coefficient of air, their heat transfer efficiency is low, requiring a large heat exchange area and air volume, leading to high footprint and power consumption. Evaporative condensers achieve cooling through spray water evaporation and heat exchange with air, resulting in significant water savings, but they suffer from large steam condensation pressure drop and uneven heat and mass transfer driving forces.

[0003] For example, the patent document with publication number CN121576813A discloses a vertical carrier gas falling film evaporative condenser cooler. In this cooler, high-temperature process steam is arranged on the outer shell side of the heat exchange tubes. Sprayed cooling water is sent into the tubes from the top of the tube bundle and forms a continuous water film along the tube wall from top to bottom. Cold air enters the tubes from the bottom of the equipment and completes heat and mass exchange by flowing countercurrently from bottom to top under the negative pressure traction of the top fan. The entire process has a wide steam flow space in the shell side, and the condensate can fall smoothly by gravity, which greatly reduces the steam condensation pressure drop.

[0004] However, during use, certain shortcomings of the aforementioned patent were discovered: As the cooling water flows downwards along the pipe wall, it continuously absorbs heat from the steam outside the pipe. The water film temperature gradually increases and then decreases from top to bottom, forming a temperature distribution pattern of hot in the middle and cold at both ends. The cold air at the bottom first contacts the water film at the bottom of the tube bundle, resulting in a large amount of water vapor precipitation within a short time. The air quickly becomes humidified in the lower section of the tube bundle, and as it continues to rise, it can no longer absorb water vapor. The driving force for heat and mass transfer in the water film in the middle and upper sections of the tube bundle is severely insufficient, and a large amount of heat exchange area cannot be utilized. The overall enthalpy of the exhaust air is low, and the air's heat-carrying capacity is poor. To compensate for the heat dissipation gap, the operating airflow of the fan must be increased, significantly increasing fan energy consumption. Simultaneously, the water film at the upper end of the tube bundle does not evaporate completely, leaving an excessively thick liquid film on the pipe wall, increasing the thermal resistance of the pipe wall and leading to a higher condensation temperature, indirectly increasing the operating energy consumption of the front-end steam supply equipment. Summary of the Invention

[0005] This invention provides a water-cooled-evaporative cooling integrated condensing device to solve the technical problem in the prior art where the low heat and mass transfer rate between water and air in the upper part of the condenser leads to a low overall enthalpy value of the exhaust air and poor air heat carrying capacity, which in turn requires an increase in the operating air volume of the fan and a significant increase in fan energy consumption.

[0006] To solve the above problems, the water-cooled-evaporative cooling integrated condensing equipment provided by the present invention adopts the following technical solution:

[0007] A water-cooled-evaporative cooling integrated condensing equipment includes a shell, an evaporative heat exchange tube bundle of a water-cooled section tube bundle inside the shell, a power fan and a spray assembly. The shell has a steam inlet and a condensate outlet. The power fan drives air to flow from bottom to top inside the evaporative heat exchange tube bundle. The shell is equipped with a water-cooled heat exchange tube bundle. The water inlet of the water-cooled heat exchange tube bundle is located at the bottom and connected to the water source, while the water outlet is located at the top and connected to the spray assembly. The shell-side steam preheats the cold water of the water-cooled heat exchange tube bundle, and the heated high-temperature spray water enters the evaporation heat exchange tube bundle along the spray assembly to form a film from top to bottom. The heat and mass transfer is completely countercurrent with the upward air to improve the exhaust enthalpy value.

[0008] The beneficial effects of the above technical solution are as follows: By adding a water-cooled heat exchange tube bundle inside the shell, the circulating water is preheated by the high-temperature steam within the equipment's shell cavity. The preheated water is then sent into the evaporative heat exchange tube bundle to form a water film from top to bottom, creating a gradient heat exchange with the cold air from bottom to top. Compared to the current conventional vertical evaporative condensation equipment operating at room temperature spray, the water film gradually cools from the high temperature at the top to the bottom, while the cold air gradually heats up from the low temperature at the bottom to the top. The temperature change trends of the two tend to be synchronized, resulting in a more uniform temperature and concentration difference in the water-air heat and mass transfer process. As the cold air rises along the tube bundle, it slowly absorbs water vapor, preventing premature saturation in the lower section. The air continuously carries latent heat of vaporization throughout its ascent, improving exhaust enthalpy. While meeting the same condensation and heat dissipation requirements, there's no need to continuously increase fan volume, steadily reducing fan energy consumption. Water films in all sections of the tube bundle evaporate normally, minimizing idle large heat exchange surfaces. It also mitigates the increased heat exchange resistance caused by excessive liquid accumulation and a thick liquid film at the upper end of the tube bundle. This solves the technical problem in existing technologies where low water-air heat and mass transfer rates at the upper part of the condenser lead to low overall exhaust enthalpy and poor air heat carrying capacity, necessitating increased fan volume and significantly increased fan energy consumption.

[0009] Furthermore, the water-cooled heat exchange tube bundle is arranged vertically, with an inlet pipe at the lower end connecting to a water source and an outlet pipe at the upper end connecting to a spray assembly. The inlet pipe has an inlet end, and the outlet pipe has an outlet end.

[0010] Furthermore, the water-cooled heat exchange tube bundle is a vertically arranged spiral coil or wound tube to enhance heat transfer in the water-cooled section and increase residence time.

[0011] The beneficial effects of the above technical solution are: under the same installation space, the spiral coil can extend the water flow heat exchange stroke compared with ordinary straight tubes, increase the contact area between the outer wall of the tube bundle and the high temperature steam in the shell side, improve the heat exchange contact time between the cold water and the steam in the shell side, and make the cold water more fully heated, which is conducive to improving the preheating temperature of the spray water.

[0012] Furthermore, a circulating water tank is disposed below the shell, and the circulating water tank is connected to the water inlet pipe of the water-cooled heat exchange tube bundle via a circulating water pump; the upper and lower ends of the evaporative heat exchange tube bundle are open, with the upper end connected to the spray assembly and the lower end corresponding to the circulating water tank.

[0013] The beneficial effects of the above technical solution are as follows: A circulating water tank is installed below the shell, and the circulating water tank is connected to the water inlet pipe of the water-cooled heat exchange tube bundle by a circulating water pump. The two ends of the evaporative heat exchange tube bundle are arranged with open ends. The water that is not completely evaporated after spraying flows directly into the circulating water tank from the lower end of the tube bundle, and is then sent back into the water-cooled heat exchange tube bundle by the circulating water pump, realizing water recycling and reducing the daily water consumption of the equipment.

[0014] Furthermore, the side wall of the circulating water tank is provided with an air intake channel formed by louvers.

[0015] The beneficial effects of the above technical solution are: outside air is evenly dispersed into the inner cavity of the equipment through the gaps of the louvers, avoiding the internal airflow turbulence caused by concentrated air intake at a single point. The grid structure of the louvers can also block dust, lint and other debris from entering the tube bundle with the airflow, reducing the probability of heat exchange pipeline blockage and extending the continuous operation cycle of the equipment.

[0016] Furthermore, the upper end of the housing is provided with a box, the spray assembly is located inside the box, and the power fan is installed on the top of the box.

[0017] Furthermore, the spray assembly includes a liquid distribution plate, the inner cavity of which is connected to the water outlet pipe, and several spray nozzles are distributed at the bottom of the liquid distribution plate, with the spray nozzles facing the evaporation heat exchange tube bundle below.

[0018] The beneficial effects of the above technical solution are: the preheated high-temperature water is first collected and stored in the inner cavity of the liquid distribution plate, and then flows down through the densely distributed spray nozzles at the bottom, which can evenly distribute the water intake of a single tube bundle and prevent the poor working conditions of excessive local water intake causing water accumulation in the tube or insufficient water intake forming a dry film on the tube wall.

[0019] Furthermore, the evaporative heat exchanger tube bundle is provided with multiple tubes, and the outer diameter of the liquid distribution plate matches the arrangement range of the evaporative heat exchanger tube bundle to ensure that the spray water is evenly injected into each evaporative heat exchanger tube bundle.

[0020] The beneficial effects of the above technical solution are: the water outlet range of the liquid distribution plate can completely cover the entire evaporative heat exchange tube bundle, and there is a corresponding spray water outlet position above each heat exchange tube bundle, ensuring that a continuous and complete coolant film can be formed on the inner wall of all tube bundles, avoiding the situation where some tube bundles are dry and unable to participate in heat exchange.

[0021] Furthermore, the water-cooled heat exchange tube bundle is located at the center of the area enclosed by multiple evaporative heat exchange tube bundles, so as to ensure uniform and stable liquid distribution at the top of the evaporative cooling tube bundle.

[0022] Furthermore, a water collection device is provided above the spray assembly inside the box to capture droplets carried by the airflow.

[0023] The beneficial effects of the above technical solution are: when the upward airflow carries tiny water droplets through the water collection device, the droplets are intercepted and fall back, flowing back into the lower circulating water path, reducing water resource loss caused by water droplets being discharged with the exhaust air.

[0024] The beneficial effects of the water-cooled-evaporative cooling integrated condensing equipment provided by this invention are as follows: By adding a centrally arranged water-cooled heat exchange tube bundle inside the shell, and using the original process steam in the shell side to preheat the circulating spray water, the working mode of direct spraying of room temperature cold water in conventional equipment is changed. This makes the water film in the evaporative tube bundle show a temperature change trend of high at the top and low at the bottom, forming a uniform and stable driving force for heat and mass transfer with the air that gradually heats up from bottom to top. This effectively avoids the problem of premature saturation of cold air, increases the exhaust enthalpy value, and reduces the required air volume of the fan and reduces the power consumption of the fan while meeting the predetermined condensing load. Meanwhile, the entire equipment relies on the bottom circulating water tank to achieve closed-loop reuse of spray water. Combined with louvered air intake and upper water collection structure, it reduces water leakage. This not only improves the problems of insufficient water film evaporation in the upper section of the evaporative heat exchange tube bundle and low heat exchange surface utilization, but also alleviates the problem of increased heat exchange resistance caused by thick liquid film on the tube wall of the evaporative heat exchange tube bundle, and reduces the energy consumption cost generated by the long-term operation of the auxiliary equipment. Attached Figure Description

[0025] 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 a schematic diagram of the overall water-cooled-evaporative cooling integrated condensing equipment provided by the present invention (showing the internal structure). Figure 2 for Figure 1 Schematic diagram of the middle shell (showing the internal structure); Figure 3 This is a temperature distribution diagram for conventional evaporative cooling in existing technologies; Figure 4 This is a temperature distribution diagram of evaporative cooling in this invention.

[0026] Explanation of reference numerals in the attached figures: 1. Shell; 2. Evaporative heat exchange tube bundle; 3. Power fan; 4. Spray assembly; 41. Liquid distribution tray; 42. Nozzle; 5. Steam inlet; 6. Condensate outlet; 7. Water-cooled heat exchange tube bundle; 8. Water inlet pipe; 9. Water outlet pipe; 10. Circulating water tank; 11. Circulating water pump; 12. Louver; 13. Box body; 14. Water collection device. Detailed Implementation

[0027] The principles and spirit of the present invention will be explained in detail below with reference to several representative embodiments.

[0028] Embodiments of the integrated water-cooled-evaporative cooling condensing equipment provided by the present invention: like Figure 1 and Figure 2 As shown, the water-cooled-evaporative cooling integrated condensing equipment mainly consists of a shell 1, a water-cooled heat exchange tube bundle 7, multiple sets of evaporative heat exchange tube bundles 2, a spray assembly 4, a box 13, a power fan 3, a circulating water tank 10, a circulating water pump 11, and a water collection device 14. High-temperature steam is uniformly introduced into the shell-side space inside the shell 1. The water circulation pipeline is connected in series from the circulating water tank 10 to the water-cooled heat exchange tube bundle 7. The air passage is connected to the inner cavity of each evaporative heat exchange tube bundle 2 through the louvers 12 on the side wall of the circulating water tank 10.

[0029] Compared to the conventional vertical evaporation and condensation equipment operating at room temperature with spraying, the water film gradually cools down from the high temperature at the top to the bottom, while the cold air gradually heats up from the low temperature at the bottom to the top. The temperature change trends of the two tend to be synchronized. The cold air slowly absorbs water vapor as it rises along the tube bundle, making it less likely to reach saturation in the lower section of the tube bundle in advance. The air can continuously carry the latent heat of vaporization throughout the process, improving the exhaust enthalpy. Under the premise of meeting the same condensation and heat dissipation requirements, there is no need to continuously increase the fan ventilation volume, which can steadily reduce the fan operating energy consumption. The water film in each section of the tube bundle from top to bottom can evaporate normally, reducing the phenomenon of large-area heat exchange surface being idle. It can also improve the phenomenon of increased heat exchange resistance caused by excessive liquid accumulation and thick liquid film at the upper end of the tube bundle.

[0030] This type of condensing equipment can be applied in production scenarios that require the condensation and recovery of process steam, such as small thermal power units and fine chemical production. In the past, most sites have used traditional vertical evaporation and condensation equipment. Due to the structural design of direct spraying of ambient temperature cold water, the equipment has long been subject to problems such as high power consumption of fans and excessive water consumption. This solution improves the shortcomings that are commonly found in the above-mentioned sites.

[0031] like Figure 1As shown, the shell 1 serves as the main load-bearing structure of the entire machine. A steam inlet 5 is located at the upper part of the side wall of the shell 1, and a condensate outlet 6 is located at the lower part. High-temperature process steam under production conditions is introduced into the internal cavity of the shell 1 through the steam inlet 5. The water-cooled heat exchange tube bundle 7 and the evaporation heat exchange tube bundle 2 are arranged together in the internal cavity of the shell 1. The outer walls of both types of tube bundles are in direct contact with the shell side filled with high-temperature steam. The shell side has ample empty space, and the liquid condensate generated after the steam condenses can fall naturally along the outer wall of the tube bundle by gravity. Finally, it gathers and is discharged outward from the condensate outlet 6 at the lower end of the shell 1.

[0032] In addition, the shell 1 is made of carbon steel plate welded together. The outer wall of the shell 1 can be covered with a heat insulation layer as needed to reduce the heat loss of high-temperature steam from the shell side to the outside. A small guide plate can also be installed inside the condensate outlet 6. The condensate falling down the pipe wall can be gathered along the guide plate to avoid local accumulation of condensate at the bottom of the shell 1.

[0033] like Figure 1 and Figure 2 As shown, the water-cooled heat exchange tube bundle 7 adopts a vertically arranged spiral coil structure. The entire coil is fixedly installed in the central area formed by multiple evaporative heat exchange tube bundles 2 to ensure uniform and stable liquid distribution at the top of the evaporative cooling system. The lower end of the coil is connected to the water inlet pipe 8, and the upper end is equipped with a water outlet pipe 9. The water inlet pipe 8 is connected to the outlet of the circulating water pump 11 through an external pipeline, and the water outlet pipe 9 is connected upward to the liquid distribution plate 41 of the spray assembly 4. The spiral coil is located at the center of the shell 1, and is surrounded by high-temperature steam in all directions. The low-temperature circulating water flowing inside the tube can be heated by the residual heat of the shell side, without the need for additional external independent heat exchange equipment to heat the spray water. In other embodiments, the water-cooled heat exchange tube bundle can also be a wound tube.

[0034] Under the same installation space, spiral coils can extend the water flow heat exchange path compared to ordinary straight tubes, increase the contact area between the outer wall of the tube bundle and the high-temperature steam in the shell side, and improve the heat exchange contact time between the cold water and the steam in the shell side. This results in more thorough heating of the cold water, which is beneficial for increasing the preheating temperature of the spray water. In other embodiments, spiral coils can also be replaced by straight tubes.

[0035] In this embodiment, multiple evaporative heat exchange tube bundles 2 are arranged in a ring around the water-cooled heat exchange tube bundle 7. All evaporative heat exchange tube bundles 2 have openings at both the upper and lower ends. The upper opening of the tube bundle is directly opposite each spray nozzle at the bottom of the liquid distribution plate 41, and the lower opening of the tube bundle is vertically aligned with the circulating water tank 10 below. After being preheated, the high-temperature water falls from the spray nozzles and directly enters the inner cavity of the tube bundle. It flows down along the inner wall of the heat exchange tube to form a continuous and complete water film. The outer side of the tube bundle continuously contacts the shell-side high-temperature steam to absorb heat, thereby completing the condensation and heat release process of the steam.

[0036] like Figure 1As shown, the circulating water tank 10 is fixedly arranged directly below the shell 1. The upper end of the tank 13 receives the unevaporated spray water dripping from the evaporative heat exchange tube bundle 2. The side wall of the water tank has a reserved ventilation area and is equipped with louvers 12. The grille gaps of the louvers 12 form the air intake channel of the equipment. Ambient ambient temperature air passes through the louvers 12 and enters the cavity above the tank 13, and enters the tube bundle through the lower opening of the evaporative heat exchange tube bundle 2. The circulating water pump 11 is installed on the side of the circulating water tank 10. The water inlet of the pump is immersed in the water in the tank, and the water outlet is connected to the water inlet pipe 8 of the water-cooled heat exchange tube bundle 7 through a pipe to realize the uninterrupted circulation of cooling water.

[0037] The circulating water tank 10 is connected to the inlet pipe 8 of the water-cooled heat exchange tube bundle 7 via the circulating water pump 11. The evaporative heat exchange tube bundle 2 is arranged with open ends. Water that is not completely evaporated after spraying flows directly into the circulating water tank 10 from the lower end of the tube bundle, and is then pumped back into the water-cooled heat exchange tube bundle 7 by the circulating water pump 11, achieving water recycling and reducing the daily water consumption of the equipment. In other embodiments, the lower end of the water-cooled heat exchange tube bundle 7 can also be directly connected to a water source, such as a faucet.

[0038] like Figure 1 As shown, a housing 13 is fixedly installed at the top of the shell 1. The spray assembly 4 is arranged entirely within the inner cavity of the housing 13. The spray assembly 4 includes a hollow liquid distribution plate 41. The liquid distribution plate 41 has an opening in the middle that connects to the water outlet pipe 9 of the water-cooled heat exchange tube bundle 7. Several spray nozzles are evenly distributed on the bottom surface of the liquid distribution plate 41. The spray nozzles are equipped with nozzles 42. The preheated high-temperature water first flows into the inner cavity of the liquid distribution plate 41 for temporary storage, and then is evenly distributed to the interior of each evaporation heat exchange tube bundle 2 through the dispersed spray nozzles, avoiding the problem of dry walls or water accumulation caused by the imbalance of water inflow to a single tube bundle. In this embodiment, the distance between the nozzle 42 and the upper end plate of the shell 1 is greater than 500mm to ensure uniform spraying. The distance between the nozzle 42 and the upper end plate of the shell 1 can also be slightly less than 500mm.

[0039] The preheated high-temperature water is first collected and stored in the inner cavity of the distribution plate 41, and then flows down through the densely distributed spray nozzles at the bottom. This ensures even distribution of the water intake to each tube bundle, preventing excessive local water intake that could cause water accumulation inside the tube, or insufficient water intake that could lead to a dry film on the tube wall. In other embodiments, the distribution plate 41 can also be replaced by multiple horizontally arranged spray pipes, which are interconnected, with one of the spray pipes connected to the outlet pipe 9.

[0040] In this embodiment, a water collection device 14 is installed inside the housing 13 and above the liquid distribution tray 41, and a power fan 3 is fixed at the top of the housing 13. The power fan 3 continuously draws air outward, creating a negative pressure inside the evaporative heat exchange tube bundle 2, driving the cold air at the bottom to flow upward continuously. When the upward airflow carrying fine water mist passes through the water collection device 14, the suspended water droplets are intercepted and collected, falling back to the lower water channel. The air, after the droplets are removed, is directly discharged to the outside of the equipment by the power fan 3. In other embodiments, the power fan 3 can also be located below the housing 1, blowing air into the evaporative heat exchange tube bundle 2 by means of a blower. Specifically, the blower is moved down to the outside of the circulating water tank 10 and blower structure. The blower outlet is connected to the louvered channel 12. The air is pushed from bottom to top through the tube bundle by positive wind pressure. The noise of the blower in this type of arrangement is more likely to spread to the ground. It is suitable for use in factory areas where noise control of the top equipment is strict. However, the inside of the box 13 will maintain a slightly positive pressure state under the blower condition. The joints of the box 13 need to be sealed with sealing strips to reduce water vapor leakage from the gaps.

[0041] In this embodiment, the water collection device 14 is made of aluminum alloy, which can effectively trap droplets entrained in the airflow and ensure water collection effect, while also possessing excellent corrosion resistance and structural strength, significantly extending the service life of the device. In other embodiments, the water collection device 14 can also be made of stainless steel. Stainless steel has good resistance to water vapor corrosion, high structural hardness, and is not easily bent or deformed by high-speed airflow over a long period of time. It is suitable for operating conditions where water vapor carries trace amounts of corrosive impurities, and can be used continuously in the humid and hot environment of the sealed enclosure 13 for extended periods.

[0042] In addition, modified polypropylene and fiberglass can also be used as processing raw materials for water collection device 14. Polypropylene has a lighter overall weight, simpler component assembly process, and lower raw material procurement cost. It is mostly used in working conditions where the water quality is clean and the environment is free of trace corrosive media. Fiberglass water collection components are integrally cast without splicing gaps and have outstanding resistance to acid, alkali and water vapor corrosion. They are widely used in chemical tail gas condensation equipment.

[0043] From the perspective of temperature distribution in the evaporative cooling process, such as Figure 3 As shown, the temperature of the spray water changes from left to right throughout the process; the air temperature changes from right to left; and when the spray water flows from top to bottom along the heat exchange tube, the temperature shows a trend of first increasing and then decreasing. When air flows counter-currently from bottom to top, the temperature only rises rapidly in the lower section of the tube bundle, and then remains relatively constant in the middle and upper sections. This temperature distribution characteristic directly reflects the shortcomings of the existing technology: the low-temperature air quickly reaches saturation after contacting the high-temperature water film in the lower section of the tube bundle. As the saturated air continues to rise, it loses its ability to absorb water vapor. The water film in the middle and upper sections of the tube bundle lacks the driving force for evaporation and mass transfer, and the large-area heat exchange surface cannot function effectively. Ultimately, this results in a low overall enthalpy of the exhaust air and poor heat carrying capacity. The only way to make up for the heat dissipation gap is to increase the fan's operating airflow, which leads to a significant increase in fan energy consumption.

[0044] like Figure 4 As shown, during the operation of the equipment in this application, the spray water is preheated by absorbing the waste heat of the shell-side steam through the water-cooled heat exchange tube bundle 7 before entering the evaporative heat exchange tube bundle 2 to participate in heat exchange. The temperature of the spray water gradually decreases as it flows from top to bottom, while the temperature of the air gradually increases as it flows counter-currently from bottom to top. The temperature changes of the gas and liquid are synchronized, forming stable gradient heat exchange conditions. As the cold air rises along the tube bundle, it can gradually absorb water vapor, preventing premature saturation in the lower section of the tube bundle. The entire heat exchange surface of the tube bundle can stably exert its evaporative heat exchange efficiency, effectively improving the exhaust enthalpy and air heat carrying capacity. Under the premise of meeting the same condensation load, the fan operating air volume can be reduced, significantly lowering the fan operating energy consumption.

[0045] The working principle of the water-cooled-evaporative cooling integrated condensing equipment provided by the present invention is as follows: When the equipment is actually running, the ambient temperature cooling water in the circulating water tank 10 is sent into the water-cooled heat exchange tube bundle 7 at the center position under the drive of the circulating water pump 11. The water in the tube gradually increases in temperature under the heat exchange effect of the high temperature steam in the shell side. The heated water flows into the liquid distribution plate 41 through the water outlet pipe 9, and then is dispersed and dripped into the inner cavity of each evaporative heat exchange tube bundle 2 through the spray nozzle at the bottom of the liquid distribution plate 41. The water spreads from top to bottom along the inner wall of the tube bundle to form a water film. Outdoor ambient temperature air enters the equipment through the louvers 12 on the side wall of the circulating water tank 10. Under the negative pressure of the top fan, it flows upward from the lower end of the evaporative heat exchange tube bundle 2 in a counter-current manner. The high temperature water film gradually decreases in temperature from top to bottom along the tube bundle, while the cold air slowly rises in temperature along the upward path. The temperature change trends of the air and water are synchronized. The cold air gradually absorbs water vapor during the ascent process and is not easy to reach saturation quickly in the lower part of the tube bundle. Evaporative heat exchange can be carried out normally throughout the entire tube bundle. The high-temperature steam inside the shell contacts the outer wall of the tube bundle, releases heat and condenses. The condensed liquid flows down the outer wall of the tube bundle and is drawn out from the condensate outlet 6 at the bottom of the shell 1. The spray water inside the evaporation tube bundle that is not completely vaporized drips down and flows into the circulating water tank 10. It is then sent to the water-cooled heat exchange tube bundle 7 again by the circulating water pump 11 to repeat the preheating process. This circulation system continuously achieves the condensation treatment of process steam, which alleviates the operational drawbacks of the original similar equipment where the cold air is saturated in advance and heat dissipation can only be guaranteed by increasing the fan air volume. The gradual change in water film temperature in sync with air temperature not only improves the problem of rapid air saturation, but also makes the heat exchange load distribution in each section of the tube bundle more uniform. It avoids the phenomenon of idle heat exchange at the upper end and overloaded heat exchange at the lower end. The condensation conditions of shell-side steam are optimized, and the condensation temperature drops slightly. The upstream heat source equipment that generates steam does not need to maintain excessively high operating parameters, which indirectly reduces the fuel consumption of the front-end supporting equipment. In addition, the closed-loop recycling of circulating water, combined with the water collection device 14 to intercept drift water, can significantly reduce the overall daily water replenishment of the equipment compared with traditional equipment. Long-term operation can gradually reduce production water expenses.

[0046] 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.

[0047] 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 water-cooled-evaporative cooling integrated condensing device, comprising a shell, an evaporative heat exchange tube bundle of a water-cooled section tube bundle inside the shell, a power fan and a spray assembly, wherein the shell has a steam inlet and a condensate outlet, and the power fan drives air to flow from bottom to top inside the evaporative heat exchange tube bundle; Its features are: The shell is equipped with a water-cooled heat exchange tube bundle. The water inlet of the water-cooled heat exchange tube bundle is located at the bottom and connected to the water source, while the water outlet is located at the top and connected to the spray assembly. The shell-side steam preheats the cold water of the water-cooled heat exchange tube bundle, and the heated high-temperature spray water enters the evaporation heat exchange tube bundle along the spray assembly to form a film from top to bottom. This forms a completely countercurrent heat and mass transfer with the upward air to increase the exhaust enthalpy.

2. The water-cooled-evaporative cooling integrated condensing equipment according to claim 1, characterized in that: The water-cooled heat exchange tube bundle is arranged vertically, with an inlet pipe at the lower end connecting to a water source and an outlet pipe at the upper end connecting to a spray assembly. The inlet pipe has an inlet end and the outlet pipe has an outlet end.

3. The water-cooled-evaporative cooling integrated condensing equipment according to claim 2, characterized in that: The water-cooled heat exchange tube bundle is a vertically arranged spiral coil or wound tube, which enhances the heat transfer of the water-cooled section and increases the residence time.

4. The water-cooled-evaporative cooling integrated condensing equipment according to claim 2 or 3, characterized in that: A circulating water tank is disposed below the shell, and the circulating water tank is connected to the water inlet pipe of the water-cooled heat exchange tube bundle via a circulating water pump; the evaporative heat exchange tube bundle is open at both ends, with the upper end connected to the spray assembly and the lower end corresponding to the circulating water tank.

5. The water-cooled-evaporative cooling integrated condensing equipment according to claim 4, characterized in that: The side wall of the circulating water tank is provided with an air intake channel formed by louvers.

6. The water-cooled-evaporative cooling integrated condensing equipment according to claim 4, characterized in that: The upper end of the housing is provided with a box, the spray assembly is located inside the box, and the power fan is installed on the top of the box.

7. The water-cooled-evaporative cooling integrated condensing equipment according to claim 6, characterized in that: The spray assembly includes a liquid distribution plate, the inner cavity of which is connected to the water outlet pipe, and several spray nozzles are distributed at the bottom of the liquid distribution plate, with the spray nozzles facing the evaporation heat exchange tube bundle below.

8. The water-cooled-evaporative cooling integrated condensing equipment according to claim 7, characterized in that: The evaporative heat exchanger tube bundle is provided with multiple tubes, and the outer diameter of the liquid distribution plate matches the arrangement range of the evaporative heat exchanger tube bundle to ensure that the spray water is evenly injected into each evaporative heat exchanger tube bundle.

9. The water-cooled-evaporative cooling integrated condensing equipment according to claim 8, characterized in that: The water-cooled heat exchange tube bundle is located at the center of the area enclosed by multiple evaporative heat exchange tube bundles to ensure uniform and stable liquid distribution at the top of the evaporative cooling tube bundle.

10. The water-cooled-evaporative cooling integrated condensing equipment according to claim 6, characterized in that: The box is equipped with a water collection device above the spray assembly to capture droplets carried by the airflow.

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