Low-temperature cooling tower system driven by liquid air expansion exhaust

Abstract

The utility model relates to the field of liquid air energy storage, and discloses a low-temperature cooling tower system driven by liquid air expansion exhaust, which is characterized in that the input end of a liquid air expansion power generation branch is connected with a liquid air storage tank, and the exhaust after expansion acting is used as dry air and is transmitted to a low-temperature cooling tower; dry air enters the porous filler from the bottom of the low-temperature cooling tower, and the spraying device sprays normal-temperature cooling water to the porous filler so as to perform heat and mass transfer with the dry air; the cooling water circulation branch is connected with the low-temperature cooling tower to provide normal-temperature cooling water for the spraying device, the normal-temperature cooling water is evenly sprayed into the porous filler through the spraying device, the temperature is reduced after heat and mass transfer of the cooling water and the dry air, and formed low-temperature cooling water flows back to the cooling water circulation branch and supplies cold to a user through the heat exchanger. Dry air discharged in the expansion power generation process is recycled to prepare low-temperature cooling water for cooling, so that the operation cost can be reduced, the energy consumption can be reduced, and the energy utilization rate can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid air energy storage, in particular to a low-temperature cooling tower system driven by liquid air expansion and exhaust. Background Art

[0002] A cooling tower is a device that uses water as a circulating coolant to absorb heat from the system and discharge it into the atmosphere, thereby reducing the water temperature. Its working principle is to utilize the contact between the free surface of water and air to reduce the temperature to the local wet-bulb temperature, completing the process of heat and mass exchange between the gas and water phases.

[0003] Currently, common cooling towers use the evaporation of water to cool hot water. When hot water passes through the cooling tower, the water dissipates heat in the tower and evaporates into water vapor. Its heat transfer efficiency is low, and the operating cost is relatively high, making it impossible to achieve energy-saving effects. Summary of the Invention

[0004] Aiming at the above problems, the purpose of the utility model is to provide a low-temperature cooling tower system driven by liquid air expansion and exhaust, which can reduce the operating cost, save energy consumption, improve the energy utilization rate, and ensure the safe and stable operation of the system.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions: A low-temperature cooling tower system driven by liquid air expansion and exhaust, which includes: A liquid air expansion power generation branch, whose input end is connected to a liquid air storage tank, taking the air flowing out of the liquid air storage tank as dry air and transmitting it into the low-temperature cooling tower; The low-temperature cooling tower includes a spraying device, a porous filler, and an air duct; The air duct is located at the bottom of the low-temperature cooling tower and is connected to the output end of the liquid air expansion power generation branch, allowing the dry air to enter the porous filler from the bottom of the low-temperature cooling tower; The porous filler is located in the middle of the low-temperature cooling tower, and the spraying device is located at the upper part of the low-temperature cooling tower, used to spray normal-temperature cooling water onto the porous filler to perform heat and mass exchange with the dry air in the porous filler; The cooling water circulation branch is connected to the low-temperature cooling tower to provide normal-temperature cooling water for the spraying device. The normal-temperature cooling water is evenly sprayed in the porous filler through the spraying device to form a water film or water mist. After the normal-temperature cooling water exchanges heat and mass with the dry air in the porous filler, its temperature decreases to form low-temperature cooling water. After leaving the low-temperature cooling tower, it flows back to the cooling water circulation branch and supplies cold to users through a heat exchanger.

[0006] Further, the low-temperature cooling tower further includes a fan, a sieve plate, a porous medium, and a static pressure box;

[0007] The static pressure box is located at the bottom of the low-temperature cooling tower and is connected to the air duct. After the cold air transmitted by the liquid air expansion power generation branch enters the static pressure box and is depressurized, the dry air is blown into the low-temperature cooling tower from the bottom up;

[0008] The porous medium is located above the static pressure box and has a gap with the porous filler for arranging a sieve plate. After the dry air is output from the static pressure box, it passes through the porous medium and the sieve plate in sequence and then is evenly sent to the porous filler for heat and mass exchange with the normal-temperature cooling water. After that, the temperature of the dry air is reduced to the corresponding wet-bulb temperature.

[0009] The fan is set at the top of the low-temperature cooling tower, above the spraying device, to discharge the air after heat and mass exchange outside the low-temperature cooling tower.

[0010] Furthermore, a number of sieve holes are evenly arranged on the sieve plate, and a wind cap with an umbrella-shaped structure is set on each sieve hole.

[0011] Furthermore, the liquid air expansion power generation branch includes a pressure pump, a heater and an expander; one end of the pressure pump is connected to the liquid air storage tank, the other end of the pressure pump is connected to one end of the expander through the heater, the other end of the expander is connected to the air duct in the low-temperature cooling tower, and the exhaust gas after expansion work in the expander is used as dry air and is input into the low-temperature cooling tower through the air duct.

[0012] Furthermore, the cooling water circulation branch includes a first water collection device, a first circulating water pump, a heat exchanger, a second water collection device and a second circulating water pump;

[0013] The inlet end of the first water collection device is connected to the low-temperature cooling tower, the outlet end of the first water collection device is connected to one end of the heat exchanger through the first circulating water pump, the other end of the heat exchanger is sequentially connected in series with the second water collection device and the second circulating water pump, and the second circulating water pump is connected to the spraying device to pump the normal-temperature cooling water into the spraying device.

[0014] Furthermore, the low-temperature cooling tower further includes a cooling tower sleeve, a water collector and an air inlet grille;

[0015] A cooling tower sleeve is arranged at the bottom of the low-temperature cooling tower, an air inlet grille is arranged inside the cooling tower sleeve, and the air duct is connected to the side of the cooling tower sleeve to send the dry air into the low-temperature cooling tower through the air inlet grille;

[0016] A water collector is arranged at the bottom of the cooling tower sleeve and is connected to the first water collection device through a water outlet pipe.

[0017] Furthermore, the cold air cooling tower includes a fan, a sieve plate and a wind cap;

[0018] The fan is set at the top of the low-temperature cooling tower, above the spraying device;

[0019] The sieve plate is located below the porous filler and above the air duct; a number of sieve holes are evenly arranged on the sieve plate, and a wind cap with an umbrella-shaped structure is set on each sieve hole.

[0020] Furthermore, the air duct adopts an air duct with a funnel-shaped structure.

[0021] Furthermore, the air duct with a funnel-shaped structure includes an integrally formed tapered portion and an air inlet pipe, the large end of the tapered portion is connected to the bottom of the low-temperature cooling tower, the small end of the tapered portion is connected to one end of the air inlet pipe, and the other end of the air inlet pipe is connected to the liquid air expansion power generation branch.

[0022] Furthermore, the low temperature cooling tower adopts positive pressure ventilation.

[0023] Furthermore, the cryogenic cooling tower system adopts an intermittent operation mode;

[0024] When the liquid air expansion power generation branch is operating during the day to generate electricity, it is used to prepare low-temperature cooling water and collect the low-temperature cooling water in the first water collection device;

[0025] The first water collecting device releases cold energy according to user needs, and collects the normal temperature water formed after the cold energy is released into the second water collecting device.

[0026] The utility model adopts the above technical solution, which has the following advantages:

[0027] 1. The utility model recovers and utilizes the dry air discharged during the expansion power generation process to prepare low-temperature cooling water, and cools the cooling water after heat exchange to obtain low-temperature cooling water to realize the cold water preparation of air conditioners.

[0028] 2. The dry air of the utility model is reduced to the wet bulb temperature corresponding to the air, without the participation of water vapor, and the efficiency of preparing the required cold water is higher.

[0029] 3. The low-temperature cooling tower of the utility model has a larger temperature difference, more heat transfer, and more heat taken away from the cooling water, achieving efficient heat exchange and reducing operating costs.

[0030] 4. The low-temperature cooling tower of the utility model can be used to prepare the cold water required for the fan coil unit of the air conditioner, and use the air to take away the heat in the room, thus saving energy consumption.

[0031] 5. The utility model adopts valve gas for power generation by expansion of liquid air, that is, dry air without moisture, which has strong moisture absorption capacity and can obtain lower temperature cooling water for cooling.

[0032] 6. The utility model adopts a circumferential air intake / uniform air supply method to ensure the cooling effect.

[0033] In summary, the utility model uses dry air to reduce the temperature to the corresponding wet-bulb temperature, and then absorbs moisture through the dry air to exchange heat with cooling water to take away a large amount of heat. The air that takes away the heat is automatically discharged to the outside of the cooling tower through the fan, thereby preparing the required cold water. The implementation of this system can reduce operating costs, save energy consumption, efficiently exchange heat, and ensure safe and stable operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of a low-temperature cooling tower system driven by the expansion and exhaust of liquid air in an embodiment of the present utility model;

[0035] Figure 2 It is a schematic diagram of the structure of a new low-temperature cooling tower in Embodiment 1 of the present utility model;

[0036] Figure 3 It is a schematic diagram of the A-A sectional structure of the low-temperature cooling tower in Embodiments 1 and 3 of the present utility model;

[0037] Figure 4 It is a schematic diagram of the sectional structure of the air cap above the sieve plate of the low-temperature cooling tower in Embodiments 1 and 3 of the present utility model;

[0038] Figure 5 It is a schematic diagram of the structure of the low-temperature cooling tower in Embodiment 2 of the present utility model;

[0039] Figure 6 It is a schematic diagram of the A-A sectional structure of the low-temperature cooling tower in Embodiment 2 of the present utility model;

[0040] Figure 7 It is a schematic diagram of the A-A sectional structure of the low-temperature cooling tower in Embodiment 3 of the present utility model;

[0041] Reference numerals:

[0042] 1 - Liquid air storage tank, 2 - Pressurizing pump, 3 - Heater, 4 - Expander, 5 - Low-temperature cooling tower, 6 - First water collection device, 7 - First circulating water pump, 8 - Heat exchanger, 9 - Second water collection device, 10 - Second circulating water pump, 51 - Fan, 52 - Spraying device, 53 - Porous packing, 54 - Air duct, 55 - Sieve plate, 56 - Air cap, 57 - Porous medium, 58 - Static pressure box, 59 - Cooling tower sleeve, 510 - Water collector, 511 - Air inlet grille. Detailed implementation manners

[0043] In order to reduce energy consumption, ensure efficient heat exchange and reduce operating costs, the present utility model provides a low-temperature cooling tower system driven by the expansion and exhaust of liquid air. The exhaust gas after the expander in the liquid air storage tank does work is used as dry air and is input into the cooling tower for heat and mass exchange with the cooling water. The dry air absorbs moisture and takes away a large amount of heat, reducing the temperature of the cooling water and also reducing the temperature of the dry air to the corresponding wet-bulb temperature. The air after absorbing water is discharged through the fan and the air outlet at the top of the cooling tower. The required cold water is prepared from the cooling water with reduced temperature. The implementation of this system can reduce operating costs, save energy, achieve efficient heat exchange, and ensure the safe and stable operation of the system.

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions of the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present utility model fall within the scope of protection of the present utility model.

[0045] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0046] Embodiment 1. In the embodiments of the present utility model, a cryogenic cooling tower system driven by the expansion and exhaust of liquid air is provided, which can be applied in the fields of heat exchange devices, air-conditioning cooling systems, refrigeration, etc. In this embodiment, as Figures 1 to 4 shown, the system includes:

[0047] A liquid air expansion power generation branch, whose input end is connected to the liquid air storage tank 1, takes the air flowing out of the liquid air storage tank 1 as dry air, and transports it to the cryogenic cooling tower 5;

[0048] The cryogenic cooling tower 5 includes a spraying device 52, a porous filler 53, and an air duct 54; the air duct 54 is located at the bottom of the cryogenic cooling tower 5 and is connected to the output end of the liquid air expansion power generation branch, and the dry air enters the porous filler 53 from the bottom of the cryogenic cooling tower 5; the porous filler 53 is located in the middle of the cryogenic cooling tower 5, and the spraying device 52 is located at the upper part of the cryogenic cooling tower 5, and is used to spray normal temperature cooling water onto the porous filler 53 to perform heat and mass exchange with the dry air in the porous filler 53;

[0049] A cooling water circulation branch is connected to the cryogenic cooling tower 5 to provide normal temperature cooling water to the spraying device 52. The normal temperature cooling water is evenly sprayed into the porous filler 53 through the spraying device 52 to form a water film or water mist, and the temperature of the normal temperature cooling water decreases after heat and mass exchange with the dry air in the porous filler 53 (that is, the dry air absorbs the cooling water, thereby reducing the temperature of the cooling water), forming low-temperature cooling water. After leaving the cryogenic cooling tower 5, it flows back to the cooling water circulation branch and supplies cold to users through a heat exchanger.

[0050] In the above embodiment, as Figure 2As shown, the low-temperature cooling tower 5 also includes a fan 51, a sieve plate 55, a porous medium 57 and a static pressure box 58. The static pressure box 58 is located at the bottom of the low-temperature cooling tower 5 and is connected to the air duct 54. The dry air transmitted to the liquid air expansion power generation branch enters the static pressure box 58 through the air duct 54 and is depressurized, and then the dry air is blown into the low-temperature cooling tower 5 from bottom to top. The porous medium 57 is located at the upper part of the static pressure box 58, and there is a gap between it and the porous filler 53, so that the sieve plate 55 is set. After the dry air is output from the static pressure box 58, the porous medium 57 and the sieve plate 55 are uniformly supplied to the porous filler 53, and the temperature of the dry air is reduced to the corresponding wet bulb temperature after heat and mass exchange with the normal temperature cooling water. The fan 51 is set at the top of the low-temperature cooling tower 5, located above the spray device 52, so as to discharge the air after heat and mass exchange to the outside of the low-temperature cooling tower 5.

[0051] An exhaust port is provided at the top of the low-temperature cooling tower 5 to discharge the dry air after heat and mass exchange to the outside of the cooling tower.

[0052] When in use, the normal temperature cooling water output by the cooling water circulation branch will be evenly sprinkled on the porous filler 53 through the spray device 52; the dry air with low humidity will enter the low-temperature cooling tower 5 through the air duct 54, and will be evenly supplied through the porous medium 57 after the pressure is reduced by the static pressure box 58; the cooling water after heat exchange will form a water film when flowing through the surface of the porous filler 53, and will exchange heat and mass with the dry air coming out of the sieve plate 55 through the porous filler 53. After absorbing moisture, the dry air will form high-humidity and high-humidity air, which will be discharged from the exhaust port at the top of the cooling tower through the fan 51. The low-temperature cooling water formed after the heat and mass exchange with the normal temperature cooling water will flow back to the cooling water circulation branch to complete the cooling water circulation; the low-temperature cooling water can be used to provide cooling to users through the heat exchanger.

[0053] In this embodiment, Figure 3 , Figure 4 As shown, a plurality of sieve holes are evenly arranged on the sieve plate 55, and each sieve hole is movably provided with an umbrella-shaped wind cap 56. The dry air enters the sieve plate 55 after passing through the porous medium 57, and flows out after passing through the wind cap 56, so as to realize the transformation of the one-way air supply of the dry air low-temperature cooling tower 5 into a multi-directional air supply, improve the airflow organization, make the heat exchange more uniform, and balance the resistance.

[0054] Specifically, the bottom of each hood 56 passes through the sieve hole, and a limit rod is provided at the bottom of the hood 56. The length of the limit rod is greater than the diameter of the sieve hole, so that when the hood 56 moves upward and leaves the sieve hole under the blowing of dry air, the hood 56 will not be blown off and the wind direction can be changed by the hood 56. At the same time, when the dry air stops blowing in, the hood 56 can be accurately dropped into the corresponding sieve hole through the limit rod.

[0055] In this embodiment, the low-temperature cooling tower 5 adopts positive pressure ventilation to ensure the cleanliness of the dry air and the cooling water. The low-temperature cooling tower 5 is used to bring the dry air into contact with the cooling water to prepare cold water for use in air-conditioning refrigeration and the like.

[0056] In the above embodiment, the liquid air expansion power generation branch includes a pressurizing pump 2, a heater 3, and an expander 4. One end of the pressurizing pump 2 is connected to the liquid air storage tank 1, the other end of the pressurizing pump 2 is connected to one end of the expander 4 via the heater 3, and the other end of the expander 4 is connected to the air duct 54 in the low-temperature cooling tower 5. The exhaust gas after expansion work in the expander 4 is used as dry air and is input into the low-temperature cooling tower 5 via the air duct 54.

[0057] During use, the air flowing out of the liquid air storage tank 1 is pressurized and heated in sequence through the pressurizing pump 2 and the heater 3, and then expands and does work to generate electricity through the expander 4. The exhaust gas after expansion work is used as dry air to perform heat and mass exchange with the normal-temperature cooling water in the low-temperature cooling tower 5, absorbing the normal-temperature cooling water to reduce the temperature of the normal-temperature cooling water. At the same time, the temperature of the dry air decreases to the wet bulb temperature of the air after absorbing water, so as to achieve more efficient preparation of cold water.

[0058] In the above embodiment, the cooling water circulation branch includes a first water collection device 6, a first circulation water pump 7, a heat exchanger 8, a second water collection device 9, and a second circulation water pump 10. The inlet end of the first water collection device 6 is connected to the low-temperature cooling tower 5. Specifically, the inlet end of the first water collection device 6 is communicated with the gap between the porous medium 57 and the porous filler 53 via an outlet pipe, and is used to recover the low-temperature cooling water after heat and mass exchange with the dry air. The outlet end of the first water collection device 6 is connected to one end of the heat exchanger 8 via the first circulation water pump 7. The other end of the heat exchanger 8 is connected in series with the second water collection device 9 and the second circulation water pump 10 in sequence, and the second circulation water pump 10 is connected to the spraying device 52 to pump the normal-temperature cooling water into the spraying device 52.

[0059] Among them, the low-temperature cooling water prepared in the low-temperature cooling tower 5 is collected in the first water collection device 6 and pumped into the heat exchanger 8 through the first circulation water pump 7 for cooling users. At the same time, the heat exchanger 8 of the air-conditioning system cools the hot air (for example, 20°C) through heat exchange with the low-temperature cooling water, and the formed air-conditioning return water (for example, 15°C) is collected as normal-temperature cooling water in the second water collection device 9 and pumped into the spraying device 52 through the second circulation water pump 10, and returns to the low-temperature cooling tower 5 to perform heat and mass exchange with the dry air to complete the cooling water circulation.

[0060] Among them, the heat exchanger 8 includes, but is not limited to, cooling the hot air of the air-conditioning system.

[0061] In this embodiment, the cooling water can flow from a heat source (such as a power plant, an industrial process, or an air-conditioning system), be cooled through heat exchange, form normal-temperature cooling water, and flow into the low-temperature cooling tower 5 to reduce the dry air to the corresponding wet-bulb temperature. After the heat exchange process in the cooling tower, the temperature of the normal-temperature cooling water decreases, and then it returns to the heat exchanger 8 through the first water collection device 6 and the first circulating water pump 7, and circulates with the heat source to continue absorbing heat, forming normal-temperature cooling water.

[0062] Specifically, in this embodiment, dry air with different inlet temperatures is cooled to the corresponding wet-bulb temperature by the low-temperature cooling tower 5 in different seasons, and the normal-temperature cooling water in the low-temperature cooling tower 5 transfers heat to the dry air. For example, cooling water at 7°C is prepared for air-conditioning water supply. The prepared cold water at 7°C has a temperature rise of 3°C in the pipe, and at the same time, the hot air at 20°C in the air-conditioning system is cooled through the heat exchanger 8. The air-conditioning return water at 15°C returns to the low-temperature cooling tower 5 again to perform heat and mass exchange with the dry air and reduce the temperature. In this embodiment, the heat exchange temperature difference is 5 to 7 degrees.

[0063] In this embodiment, the second circulating water pump 10 is connected to the low-temperature cooling tower 5 through a normal-temperature water pipeline. The normal-temperature water pipeline sends the normal-temperature water to the cooling tower 5 through the second circulating water pump 10 to be cooled into normal-temperature cooling water; the water outlet pipe connected to the first water collection device 6 is a cold water pipeline, and the cooling water with a reduced temperature after heat exchange in the low-temperature cooling tower 5 is sent out through the cold water pipeline.

[0064] During use, the air-conditioning return water flowing out of the heat exchanger 8 of the air-conditioning system is collected in the second water collection device 9, and the normal-temperature air-conditioning return water is pressed to the low-temperature cooling tower 5 through the normal-temperature water pipeline and the like with a certain pressure by the second circulating water pump 10. The normal-temperature cooling water is evenly sprinkled on the porous filler 53 through the spraying device 52; at the same time, the dry air with a low enthalpy value enters the tower through the air duct 54. When the normal-temperature cooling water flows through the surface of the filler to form a water film, and the dry air coming out of the sieve plate 55 passes through the porous filler 53 to absorb the normal-temperature cooling water and perform heat exchange with it. The dry air forms hot air with high humidity and high enthalpy value after absorbing water and is discharged from the top fan 51. The cooling water with a reduced temperature flows into the first water collection device 6 through the cold water pipeline. When it is used to supply water to the fan coil of the heat exchanger 8, it is supplied to the heat exchanger 8 through the first circulating water pump 7 as a cooling medium to cool the hot air in the air-conditioning system. The hot water (i.e., normal-temperature water) formed after the low-temperature cooling water dissipates heat and rises in temperature flows into the second water collection device 9, and then flows into the low-temperature cooling tower 5 through the second circulating water pump 10 to complete the cooling water circulation. The utility model can reduce the operation cost, save energy consumption, perform efficient heat exchange, and ensure the safe and stable operation of the system.

[0065] Embodiment 2: In the embodiment of the present invention, a low-temperature cooling tower system driven by liquid air expansion and exhaust is provided. In this embodiment, as Figure 1 、 Figure 5 、Figure 6 As shown, the system structure and principle are similar to those of the low-temperature cooling tower system driven by the expansion and exhaust of liquid air in the first embodiment. The difference is that in addition to the fan 51, the spraying device 52, the porous filler 53, and the air duct 54 in the first embodiment, the low-temperature cooling tower 5 in this embodiment further includes a cooling tower sleeve 59, a water collector 510, and an air inlet grille 511.

[0066] A cooling tower sleeve 59 is provided at the bottom of the low-temperature cooling tower 5, and an air inlet grille 511 is provided inside the cooling tower sleeve 59. The air duct 54 is connected to the side of the cooling tower sleeve 59 to send dry air into the low-temperature cooling tower 5 through the air inlet grille 511. A water collector 510 is provided at the bottom of the cooling tower sleeve 59 to collect low-temperature cooling water and connect to the first water collection device 6 through a water outlet pipe.

[0067] During use, the hot water from the air-conditioning system is collected in the second water collection device 9, and the circulating water is pressed to the low-temperature cooling tower 5 through a pipeline with a certain pressure by the second circulation water pump 10. The normal-temperature water is evenly sprayed on the porous filler 53 through the spraying device 52; the dry air with a low enthalpy value enters the tower through the air inlet grille 511 from the cooling tower sleeve 59 through the air duct 54. When the normal-temperature cooling water flows through the surface of the filler to form a water film, heat exchange is carried out with the dry air passing through the porous filler 53. The hot air with a high humidity and a high enthalpy value formed after the dry air exchanges heat is discharged from the top fan 51. The low-temperature cooling water droplets after heat exchange drop into the water collector 510 and flow into the first water collection device 6 through the water outlet pipe. When used for supplying water to the fan coil unit, it is supplied through the first circulation water pump 7 to cool the hot air of the air-conditioning system. The hot water after the low-temperature cooling water dissipates heat and rises in temperature flows into the second water collection device 9 and then flows into the low-temperature cooling tower 5 through the second circulation water pump 10 to complete the cooling water circulation. The utility model can reduce the operation cost, save energy consumption, efficiently exchange heat, and ensure the safe and stable operation of the system.

[0068] Embodiment 3: In the embodiment of the present utility model, a low-temperature cooling tower system driven by the expansion and exhaust of liquid air is provided. In this embodiment, as Figure 1 、 Figure 7 shown, the system structure and principle are similar to those of the low-temperature cooling tower system driven by the expansion and exhaust of liquid air in the first embodiment. The difference is that in addition to the fan 51, the spraying device 52, the porous filler 53, the sieve plate 55, and the air cap 56 in the first embodiment, the low-temperature cooling tower 5 in this embodiment further includes an air duct 54 in a funnel shape. The sieve plate 55 is located below the porous filler 53 and above the air duct 54.

[0069] The air duct 54 includes an integrally formed tapered portion and an air inlet pipe. The large end of the tapered portion is connected to the bottom of the low-temperature cooling tower 5, the small end of the tapered portion is connected to one end of the air inlet pipe, and the other end of the air inlet pipe is connected to the liquid air expansion power generation branch.

[0070] During use, the dry air transmitted by the liquid air expansion power generation branch enters the low-temperature cooling tower 5 from bottom to top after passing through the air inlet pipe and the tapered part, and the air supply direction of the dry air is changed to multi-directional air supply through the sieve plate 55 and the air caps 56 thereon.

[0071] In the above embodiments, since the exhaust gas after the liquid air expansion power generation does work is a dry and moisture-free pure dry air, which has strong moisture absorption ability, and can obtain lower temperature cooling water for cooling after absorbing water. However, there is a problem of single-direction flow, resulting in uneven air flow distribution, thus affecting the cooling effect of the cooling water; therefore, the present utility model adopts structures such as the porous medium 57, the sieve plate 55, the air caps 56, and the air inlet grille 51 to change the single-direction air inlet into multi-directional air supply.

[0072] In the above embodiments, the inlet temperature of the dry air is different in different seasons, and the efficiency of preparing cold water is different. The wet bulb temperature of the dry air is also different in different seasons. The temperature of the water reduced by the dry air in the heat exchanger is different in different seasons.

[0073] In the above embodiments, the low-temperature cooling tower system of the present utility model adopts an intermittent operation mode, which is completely different from the working mode of the cooling tower in the prior art. The existing cooling tower operates continuously for 24 hours. The intermittent operation mode adopted by the present utility model is to work when the liquid air expansion power generation branch generates electricity, that is, to work during the day when the expander expands and generates electricity, and to stop running at night.

[0074] Among them, when the liquid air expansion power generation branch generates electricity during the day, it works and operates to prepare low-temperature cooling water, and collects the low-temperature cooling water in the first water collecting device 6. When the user needs cooling, the first circulating water pump 7 releases the low-temperature cooling water stored in the first water collecting device 6 to the heat exchanger 8. The low-temperature cooling water in the first water collecting device 6 releases cold energy according to the user's demand, and collects the normal-temperature water formed after releasing the cold energy in the second water collecting device 9 for standby, for use when the cooling tower works.

[0075] In summary, in the cryogenic cooling tower system driven by the expansion and exhaust of liquid air of the present utility model, the heat source for preparing normal-temperature cooling water can be a power plant, an industrial process or an air-conditioning system. The temperature of the dry air after water absorption is reduced to the corresponding wet-bulb temperature. The normal-temperature cooling water undergoes a heat exchange process in the cooling tower, and the temperature of the normal-temperature cooling water is reduced, and then it returns to the heat exchanger 8 to continue absorbing heat. The normal-temperature cooling water is the hot water (i.e., air-conditioning return water) from the air-conditioning system, and through a circulating water pump, the circulating water is pressed into the cryogenic cooling tower through a pipeline, etc. at a certain pressure, and the normal-temperature cooling water is evenly sprayed on the porous filler through a spraying device. The dry air with a low enthalpy value enters the tower from the bottom under the action of a fan. When the normal-temperature cooling water flows through the surface of the filler, a water film is formed and heat exchange is carried out with the dry air. The hot air with high humidity and high enthalpy value is discharged from the top of the tower, and the low-temperature cooling water drops into the water collector and flows into the water collection device through the water outlet pipe. When it is used for supplying water to the fan coil unit, it is supplied through a water pump to cool the hot air of the air-conditioning system. The hot water formed after the low-temperature cooling water dissipates heat and rises in temperature then flows back into the cryogenic cooling tower through the circulating water pump to complete the cooling water circulation.

[0076] The present utility model has the following advantages: The cooling tower of the present utility model exchanges heat between the normal-temperature cooling water carried in the tower and the dry air. After the dry air absorbs the normal-temperature cooling water, the temperature of the normal-temperature cooling water is reduced, so that the normal-temperature cooling water is cooled. By adopting the circumferential air intake / uniform air supply mode, the cooling effect can be guaranteed.

[0077] Furthermore, the present utility model adopts positive-pressure ventilation to ensure the cleanliness of the dry air and the normal-temperature cooling water.

[0078] Furthermore, the cryogenic cooling tower of the present utility model changes the one-way air supply into a multi-way air supply, improves the air flow organization, makes the heat exchange more uniform, and the resistance is balanced.

[0079] Furthermore, the present utility model uses dry air to prepare cold water, cools the normal-temperature cooling water through the cooling tower, and realizes the preparation of cold water for air-conditioning.

[0080] Furthermore, after the dry air of the present utility model absorbs water, it is reduced to the corresponding wet-bulb temperature of the air, and there is no participation of water vapor, so the efficiency of preparing the required cold water is higher.

[0081] Furthermore, the cryogenic cooling tower of the present utility model has a larger temperature difference, more heat transfer, takes away more heat from the water, realizes efficient heat exchange, and reduces the operation cost.

[0082] Furthermore, the cryogenic cooling tower of the present utility model can be used to prepare cold water required for air-conditioning fan coil units, and uses air to take away the heat in the room, saving energy consumption.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cryogenic cooling tower system driven by the expansion and exhaust of liquid air, characterized in that, Including: A liquid air expansion power generation branch, whose input end is connected to the liquid air storage tank (1), and takes the air flowing out of the liquid air storage tank (1) as dry air and transports it to the low-temperature cooling tower (5); The low-temperature cooling tower (5) includes a spraying device (52), a porous packing (53) and an air duct (54); the air duct (54) is located at the bottom of the low-temperature cooling tower (5) and is connected to the output end of the liquid air expansion power generation branch, and the dry air enters the porous packing (53) from the bottom of the low-temperature cooling tower (5); the porous packing (53) is located in the middle of the low-temperature cooling tower (5), and the spraying device (52) is located at the upper part of the low-temperature cooling tower (5) and is used to spray normal-temperature cooling water onto the porous packing (53) to perform heat and mass exchange with the dry air in the porous packing (53); The cooling water circulation branch is connected to the low-temperature cooling tower (5) to provide normal-temperature cooling water to the spraying device (52). The normal-temperature cooling water is evenly sprayed into the porous packing (53) through the spraying device (52) to form a water film or water mist. After the normal-temperature cooling water exchanges heat and mass with the dry air in the porous packing (53), the temperature decreases to form low-temperature cooling water. After leaving the low-temperature cooling tower (5), it flows back to the cooling water circulation branch and supplies cold to users through the heat exchanger.

2. The cryogenic cooling tower system driven by the expansion and exhaust of liquid air as claimed in claim 1, wherein, The low-temperature cooling tower (5) further includes a fan (51), a sieve plate (55), a porous medium (57) and a static pressure box (58); The static pressure box (58) is located at the bottom of the low-temperature cooling tower (5) and is connected to the air duct (54). The cold air transported by the liquid air expansion power generation branch enters the static pressure box (58) through the air duct (54) to reduce the pressure, and then blows the dry air into the low-temperature cooling tower (5) from bottom to top; The porous medium (57) is located above the static pressure box (58) and has a gap with the porous packing (53) for arranging the sieve plate (55). After the dry air is output from the static pressure box (58), it passes through the porous medium (57) and the sieve plate (55) in sequence and then uniformly supplies air to the porous packing (53), and the temperature of the dry air decreases to the corresponding wet bulb temperature after heat and mass exchange with the normal-temperature cooling water; The fan (51) is arranged at the top of the low-temperature cooling tower (5) and above the spraying device (52) to discharge the air after heat and mass exchange outside the low-temperature cooling tower (5).

3. The cryogenic cooling tower system driven by the expansion and exhaust of liquid air as claimed in claim 2, wherein A number of sieve holes are evenly arranged on the sieve plate (55), and a wind cap (56) with an umbrella-shaped structure is arranged on each sieve hole.

4. The cryogenic cooling tower system driven by the expansion and exhaust of liquid air according to claim 2, characterized in that, The liquid air expansion power generation branch includes a pressure pump (2), a heater (3) and an expander (4); one end of the pressure pump (2) is connected to the liquid air storage tank (1), the other end of the pressure pump (2) is connected to one end of the expander (4) through the heater (3), and the other end of the expander (4) is connected to the air duct (54) in the low-temperature cooling tower (5), and takes the exhaust gas after expansion work in the expander (4) as dry air and inputs it into the low-temperature cooling tower (5) through the air duct (54).

5. The cryogenic cooling tower system driven by the expansion and exhaust of liquid air as claimed in claim 1, wherein The cooling water circulation branch includes a first water collecting device (6), a first circulating water pump (7), a heat exchanger (8), a second water collecting device (9) and a second circulating water pump (10); The inlet end of the first water collecting device (6) is connected to the low-temperature cooling tower (5). The outlet end of the first water collecting device (6) is connected to one end of the heat exchanger (8) via the first circulating water pump (7). The other end of the heat exchanger (8) is successively connected in series with the second water collecting device (9) and the second circulating water pump (10). The second circulating water pump (10) is connected to the spraying device (52) to pump the normal-temperature cooling water into the spraying device (52).

6. The cryogenic cooling tower system driven by the expansion and exhaust of liquid air as claimed in claim 1, wherein, The low-temperature cooling tower (5) further includes a cooling tower sleeve (59), a water collector (510), and an air inlet grille (511). The cooling tower sleeve (59) is provided at the bottom of the low-temperature cooling tower (5). The air inlet grille (511) is provided inside the cooling tower sleeve (59). The air duct (54) is connected to the side of the cooling tower sleeve (59) to send the dry air into the low-temperature cooling tower (5) through the air inlet grille (511). The water collector (510) is provided at the bottom of the cooling tower sleeve (59) and is connected to the first water collecting device (6) via the water outlet pipe.

7. The cryogenic cooling tower system driven by the expansion and exhaust of liquid air as claimed in claim 1, wherein The low-temperature cooling tower (5) includes a fan (51), a sieve plate (55), and a wind cap (56). The fan (51) is provided at the top of the low-temperature cooling tower (5) and above the spraying device (52). The sieve plate (55) is located below the porous packing (53) and above the air duct (54). A number of sieve holes are evenly provided on the sieve plate (55), and a wind cap (56) with an umbrella-like structure is provided on each sieve hole.

8. The cryogenic cooling tower system driven by the expansion and exhaust of liquid air as claimed in claim 7, wherein, The air duct (54) is an air duct with a funnel-shaped structure.

9. The cryogenic cooling tower system driven by the expansion and exhaust of liquid air according to claim 8, characterized in that, The air duct (54) with a funnel-shaped structure includes an integrally formed tapered part and an air inlet pipe. The large end of the tapered part is connected to the bottom of the low-temperature cooling tower (5), the small end of the tapered part is connected to one end of the air inlet pipe, and the other end of the air inlet pipe is connected to the liquid air expansion power generation branch.

10. The cryogenic cooling tower system driven by the expansion and exhaust of liquid air as claimed in claim 1, wherein The low-temperature cooling tower (5) uses positive pressure ventilation.

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