Opening adjustment design method of demisting mesh enclosure

Abstract

The invention relates to the technical field of mechanical cooling tower circulating cooling water saving, in particular to an opening adjustment design method of a demisting mesh enclosure, which comprises the following steps: S1, in order to ensure the cooling efficiency of a mechanical ventilation cooling tower and the energy balance of a system, the heat exchange enthalpy value of the cooling tower needs to be considered in the opening design of the demisting mesh enclosure; water is in contact with air for heat exchange, part of water evaporates to take away latent heat, and therefore the cooling effect is achieved, and in the enthalpy difference method, the basic thermodynamic calculation equation of the cooling tower is shown as # imgabs0 #. Wherein # imgabs 1 # is a cooling number or an exchange number and represents the cooling capacity of the cooling tower; # imgabs2 is the heat dissipating capacity of water, and kilowatt (kW) is taken as a unit; and # 3 imgabs3 is the air volume of the cooling tower, and kilogram per second (kg / s) is taken as the unit. By accurately calculating the heat dissipating capacity and the ventilation quantity of the cooling tower and considering the influence of the demisting mesh enclosure on the ventilation quantity, the method can ensure that the cooling efficiency of the cooling tower is kept unchanged after the demisting mesh enclosure is additionally arranged, so that the energy balance of the system is maintained.

Description

Technical Field

[0001] The invention relates to the technical field of water-saving of circulating cooling water in a mechanical cooling tower, and in particular to a method for designing an opening adjustment of a demisting mesh cover. Background Art

[0002] For power plants, coal chemical industry, petrochemical industry, and steel and metallurgical industry, cooling towers are needed to generate a large amount of cooling water to cool condensers, generators, auxiliary machines, chemical process equipment, blast furnaces, refining furnaces and other equipment and devices, so as to ensure the normal operation of the entire process system. The mechanical ventilation cooling tower, which is currently more commonly used, causes a large loss of cooling water due to its own evaporation. During the operation of the cooling tower, the airflow out of the tower will mix with the surrounding atmosphere above the cooling tower and condense, and water droplets will precipitate to form plume. The generation of plume will accelerate the corrosion of surrounding equipment or devices, especially for air-cooled island insulator equipment. In long-term dense fog weather, corona and local arc discharge will occur at the end of the insulator, affecting the normal production and operation of industrial enterprises.

[0003] Existing mechanical ventilation cooling towers reduce water loss by installing water collectors. The main types of water collectors are corrugated plate water collectors and new cyclone water collectors. The corrugated plate water collector removes droplets carried in the airflow through the principle of inertia. After the airflow in the tower carries the droplets and moves vertically upward into the corrugated plate water collector, the airflow continues to rise through the curved channel of the folding plate of the water collector. However, due to the effect of inertia, the droplet particles cannot change their direction in time with the airflow, and directly collide with the folding plate of the water collector and are intercepted back. The new cyclone water collector uses the guide vane to change the water vapor from a vertical rising state to a rotating turbulent state. After the droplets leave the water collector, the water vapor vortex continues to rotate. During the rising displacement, the water vapor particles that rise in a rotating state have a longer movement distance and time than those that rise in a linear state, which increases the probability of collision between particles, especially between droplets of small particle size, and effectively improves the water collection efficiency.

[0004] Water loss is reduced by using a water collector in the cooling tower. This method can only intercept large droplets with a diameter greater than a certain value in the vortex flow in the cooling tower. A large number of tiny droplets at the cooling tower outlet will be blown into the atmosphere by the cooling tower fan, mixed with the surrounding atmosphere and condensed to form plume, resulting in a waste of water resources. Under the influence of the external turbulent environmental wind, the near-ground flow field behind the tower and the high-altitude plume flow field near the air-cooled island produce complex shear, vortex, multi-scale heat and mass transfer and other complex fluid mechanics problems, resulting in the occurrence of flashover accidents. Summary of the invention

[0005] The object of the present invention is to provide a method for designing an opening adjustment of a demisting mesh cover to solve at least one technical problem existing in the prior art.

[0006] In order to solve the above technical problems, the present invention provides a method for designing an opening adjustment of a demisting mesh cover, which is characterized by comprising the steps of: S1: In order to ensure the cooling efficiency of the mechanical ventilation cooling tower and the energy balance of the system, the opening design of the mist removal mesh cover needs to consider the heat exchange enthalpy value of the cooling tower. Water exchanges heat by contacting with the air, and part of the water evaporates to take away the latent heat, thereby achieving a cooling effect. In the enthalpy difference method, the basic thermal calculation equation of the cooling tower is expressed as: (1) in: It is the cooling number or exchange number, which indicates the cooling capacity of the cooling tower; is the heat dissipation of water, in kilowatts (kW); is the air volume of the cooling tower in kilograms per second (kg / s).

[0007] Further, the steps include: S2: The heat dissipation Q is calculated as follows: (2) in: is the specific heat capacity of water, which is 4.18 kJ / kg°C; is the mass flow rate of circulating water in kilograms per second (kg / s); is the temperature difference between the inlet and outlet water in degrees Celsius (°C).

[0008] Further, the steps include: S3: Ventilation volume Calculated by: (3) Where: is the ventilation area m2; is the wind speed m / s; is the vent radius in m.

[0009] Further, the steps include: S4: To ensure that the cooling effect remains unchanged before and after the installation of the water removal screen, the cooling tower ventilation volume ( ) must remain unchanged, so we can get: (4) Where: , The ventilation area of ​​the mesh cover is m2 and the opening area is m2; , The wind speed at the mesh is m / s, and the wind speed at the opening is m / s; is the opening radius m.

[0010] Further, the steps include: S5: By simplifying equation (4), we can get .

[0011] Further, the steps include: S6: The difference in ambient wind speed and temperature will affect the opening design of the defogger screen; After many tests, it was verified that the design range of the defogger screen diameter is as follows:

[0012] Where: d is the upper diameter of the defogger screen; d 1 is the cooling tower wind tube diameter (the lower end diameter of the demisting mesh cover); d 2 is the opening diameter; k For experience value, usually ; The opening diameter design of the defogger screen within this range has little impact on the ventilation volume and can maintain the cooling efficiency and energy balance of the system.

[0013] Furthermore, the cooling number refers to the amount of heat that can be transferred by a unit volume of filler in a cooling tower under a unit temperature difference under specific operating conditions. The cooling number is an important parameter for evaluating the performance of a cooling tower, and is related to factors such as the design, operating conditions, and environmental parameters of the cooling tower. If the cooling number of a cooling tower remains unchanged over a period of time, it means that the operating conditions and environmental parameters of the cooling tower have not changed significantly during this period of time, or the design and operation of the cooling tower have reached a stable state. Therefore, whether the cooling number of a cooling tower remains unchanged can be used as an indicator for evaluating the operating status and performance of a cooling tower. If the cooling number remains stable, it usually indicates that the cooling tower is operating normally; if the cooling number changes, the cooling tower may need to be adjusted or repaired. In actual operation, the operator of the cooling tower should regularly monitor the cooling number to ensure the efficient operation of the cooling system.

[0014] By adopting the above technical solution, the present invention has the following beneficial effects: (1) By accurately calculating the heat dissipation and ventilation volume of the cooling tower and considering the influence of the demister screen on the ventilation volume, this method can ensure that the cooling efficiency of the cooling tower remains unchanged after the demister screen is installed, thereby maintaining the energy balance of the system.

[0015] (2) By rationally designing the opening diameter of the defogger, this method can effectively remove the mist at the cooling tower outlet while ensuring cooling efficiency, reduce water loss, and improve the overall efficiency of the system.

[0016] (3) By monitoring and calculating the key parameter of the cooling number, this method can promptly detect changes in the operating status of the cooling tower, so that corresponding measures can be taken to adjust or repair it to ensure the stable operation of the system.

[0017] (4) Taking into account the influence of ambient wind speed and temperature on the opening design of the defogger mesh, this method was verified through multiple tests and a reasonable range of defogger mesh diameter design was obtained, so that the defogger mesh can maintain stable performance under different environmental conditions.

[0018] (5) This method makes the opening design of the defogger cover more intuitive and easy to operate by deriving and simplifying the formula, thus reducing the design difficulty and cost.

[0019] (6) By optimizing the design of the defogger hood, this method can reduce the waste of water resources, lower operating costs, and improve the operating efficiency of the cooling tower, thereby bringing greater economic benefits to the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a top view of the demisting mesh cover; Figure 2 A cross-sectional view showing a side view of a braided fabric unit disposed on a support frame; Figure 3 It is a top view of the demisting screen of the cooling tower; Figure 4 It is a top view of the structure of a woven fabric unit; Figure 5 A top view of another demisting mesh structure; Figure 6 for Figure 5 A top view of a braided fabric unit; Figure 7 It is a schematic diagram of the three-dimensional structure of the demisting mesh cover; Figure 8 This is a photo of the cooling tower demister cover in actual application.

[0022] Reference numerals: 1-hood body; 2-support frame; 3-woven fabric unit; 4-opening structure; 5-connecting rope; 6-connecting ring; 7-hoop ring; 8-hoop rope; 9-fan-shaped cutting piece; 10-hoop tube. DETAILED DESCRIPTION The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] It should also be noted that the following specific embodiments or specific implementations are a series of optimized settings listed in the present invention to further explain the specific content of the invention, and these settings can be used in combination or in association with each other.

[0026] The present invention is further explained below in conjunction with specific implementation modes.

[0027] Example 1 The present embodiment provides a method for designing an opening adjustment of a demisting screen, characterized in that it comprises the following steps: S1: In order to ensure the cooling efficiency of the mechanical ventilation cooling tower and the energy balance of the system, the opening design of the mist removal mesh cover needs to consider the heat exchange enthalpy value of the cooling tower. Water exchanges heat by contacting with the air, and part of the water evaporates to take away the latent heat, thereby achieving a cooling effect. In the enthalpy difference method, the basic thermal calculation equation of the cooling tower is expressed as: (1) in: It is the cooling number or exchange number, which indicates the cooling capacity of the cooling tower; is the heat dissipation of water, in kilowatts (kW); is the air volume of the cooling tower in kilograms per second (kg / s).

[0028] As a further implementation of this embodiment, the steps are as follows: S2: The heat dissipation Q is calculated as follows: (2) in: is the specific heat capacity of water, which is 4.18 kJ / kg°C; is the mass flow rate of circulating water in kilograms per second (kg / s); is the temperature difference between the inlet and outlet water in degrees Celsius (°C).

[0029] As a further implementation of this embodiment, the steps are as follows: S3: Ventilation volume Calculated by: (3) Where: is the ventilation area m2; is the wind speed m / s; is the vent radius in m.

[0030] As a further implementation of this embodiment, the steps are as follows: S4: To ensure that the cooling effect remains unchanged before and after the installation of the water removal screen, the cooling tower ventilation volume ( ) must remain unchanged, so we can get: (4) Where: , The ventilation area of ​​the mesh cover is m2 and the opening area is m2; , The wind speed at the mesh is m / s, and the wind speed at the opening is m / s; is the opening radius m.

[0031] As a further implementation of this embodiment, the steps are as follows: S5: By simplifying equation (4), we can get .

[0032] As a further implementation of this embodiment, the steps are as follows: S6: The difference in ambient wind speed and temperature will affect the opening design of the defogger screen; After many tests, it was verified that the design range of the defogger screen diameter is as follows:

[0033] Where: d is the upper diameter of the defogger screen; d 1 is the cooling tower wind tube diameter (the lower end diameter of the demisting mesh cover); d 2 is the opening diameter; k For experience value, usually ; The opening diameter design of the defogger screen within this range has little impact on the ventilation volume and can maintain the cooling efficiency and energy balance of the system.

[0034] As a further embodiment of the present application, the cooling number refers to the amount of heat that can be transferred by a unit volume of filler in a cooling tower under a unit temperature difference under specific operating conditions. The cooling number is an important parameter for evaluating the performance of a cooling tower, and is related to factors such as the design, operating conditions, and environmental parameters of the cooling tower. If the cooling number of a cooling tower remains unchanged over a period of time, it means that the operating conditions and environmental parameters of the cooling tower have not changed significantly during this period of time, or the design and operation of the cooling tower have reached a stable state.

[0035] Therefore, whether the cooling number of the cooling tower remains unchanged can be used as an indicator to evaluate the operating status and performance of the cooling tower. If the cooling number remains stable, it usually indicates that the cooling tower is operating normally; if the cooling number changes, the cooling tower may need to be adjusted or repaired. In actual operation, the operator of the cooling tower should regularly monitor the cooling number to ensure the efficient operation of the cooling system. The demisting mesh of the present application is used to block the backflow of droplets and plumes in the hot and humid airflow, and the opening size of the demisting mesh needs to be designed according to the ventilation volume. For example, in winter, due to the low ambient temperature, the cooling demand of the cooling tower is further reduced. In this case, reducing the ventilation volume can ensure the cooling effect, and the opening of the demisting mesh can be appropriately reduced to improve the water-saving efficiency; in summer, due to the low ambient temperature, the cooling load of the cooling tower is large, and the cooling effect is generally ensured by increasing the ventilation volume, so the opening design of the demisting mesh should also be increased.

[0036] In addition, the present application introduces an empirical value k, the value of k is related to the heat exchange temperature difference and the ambient wind speed. This opening adjustment method does not affect the cooling efficiency and cooling effect of the cooling tower.

[0037] By adopting the above technical solution, the present invention has the following beneficial effects: (1) By accurately calculating the heat dissipation and ventilation volume of the cooling tower and considering the influence of the demister screen on the ventilation volume, this method can ensure that the cooling efficiency of the cooling tower remains unchanged after the demister screen is installed, thereby maintaining the energy balance of the system.

[0038] (2) By rationally designing the opening diameter of the defogger, this method can effectively remove the mist at the cooling tower outlet while ensuring cooling efficiency, reduce water loss, and improve the overall efficiency of the system.

[0039] (3) By monitoring and calculating the key parameter of the cooling number, this method can promptly detect changes in the operating status of the cooling tower, so that corresponding measures can be taken to adjust or repair it to ensure the stable operation of the system.

[0040] (4) Taking into account the influence of ambient wind speed and temperature on the opening design of the defogger mesh, this method was verified through multiple tests and a reasonable range of defogger mesh diameter design was obtained, so that the defogger mesh can maintain stable performance under different environmental conditions.

[0041] (5) This method makes the opening design of the defogger cover more intuitive and easy to operate by deriving and simplifying the formula, thus reducing the design difficulty and cost.

[0042] (6) By optimizing the design of the defogger hood, this method can reduce the waste of water resources, lower operating costs, and improve the operating efficiency of the cooling tower, thereby bringing greater economic benefits to the enterprise.

[0043] Example 2 like Figure 1-8 As shown, a demisting mesh cover provided in this embodiment includes a cover body 1 and a support frame 2; The support frame 2 is arranged at the top of the cooling tower; The cover body 1 is arranged on the support frame 2 and is fixedly connected to the support frame 2; The cover body 1 is a circular or annular structure.

[0044] As a further implementation of this embodiment, the cover body 1 is spliced ​​by multiple woven fabric units 3 to form a circular or ring structure.

[0045] As a further implementation of this embodiment, the cover body 1 is made of one or more weaving methods including woven, weft knitted, and warp knitted.

[0046] As a further implementation of this embodiment, the cover body 1 is annular, and an opening structure 4 is formed at the inner diameter thereof for adjusting the ventilation volume of the cooling tower.

[0047] As a preferred implementation of this embodiment, the opening size of the opening structure 4 can be adjusted or customized in combination with Example 1.

[0048] As a preferred implementation of this embodiment, the three-dimensional defogger screen uses a variety of composite materials, including but not limited to: three-dimensional (3D) woven nylon mesh, three-dimensional (3D) woven polyester mesh, ultra-high molecular weight polyethylene webbing, Dyneema webbing, ultra-high molecular weight polyethylene yarn, Dyneema yarn, high molecular weight polyester fiber, ultra-high molecular weight polyester fiber. The materials used can also be one or more of the materials listed above.

[0049] When the mist removing mesh cover disclosed in the present application is actually used, the support frame 2 is first set at the top of the cooling tower, and then the cover body 1 is set on the support frame 2. In addition, the cover body 1 can also be connected to the support frame 2 in an integrated manner and then set at the top of the cooling tower. The mist removing mesh cover is installed inside or outside the top of the cooling tower. Without changing the original working conditions of the cooling tower, the outlet flow field of the wind duct of the mechanical ventilation cooling tower is changed to block the backflow of droplets and plumes in the humid and hot air flow. The cover body 1 is circular or annular. When the cover body 1 is circular, the overall mechanical properties of the cover body 1 are excellent, and it is not easy to be damaged or broken, and the cover body 1 can liquefy water vapor and reflux it into the cooling tower, thereby improving water-saving performance. When the cooling load of the cooling tower is large, it is necessary to increase the ventilation volume to improve the cooling efficiency. At this time, the cover body 1 is set as an annular structure, and the inner diameter of the annular structure is an opening structure 4, which is a fixed structure or an adjustable structure.

[0050] The braided fabric unit 3 is fan-shaped, and a plurality of braided fabric units 3 are spliced ​​together in the circumferential direction to form the cover body 1; Two adjacent woven fabric units 3 are connected via a connecting structure.

[0051] As a further implementation of this embodiment, the connection structure is a sewing connection structure, a welding connection structure or an adhesive connection structure.

[0052] As a further implementation of this embodiment, a connecting rope 5 is provided on the braided fabric unit 3; A connecting ring 6 is provided on the outer edge of the support frame 2, and the connecting ring 6 passes through the braided fabric unit 3 through a through hole provided at a corresponding position of the braided fabric unit 3; One end of the connecting rope 5 is arranged at the fan-shaped tip of the braid unit 3, and the other end is tied to the connecting ring 6, so that the braid unit 3 is folded, and the connection position of the connecting rope 5 and the connecting ring 6 is adjusted according to the required opening size to achieve the adjustment of the opening size.

[0053] As a further implementation of this embodiment, the braid unit 3 is further provided with a hoop 7 and a hoop rope 8; A plurality of hoop rings 7 are arranged in the radial direction of the braided fabric unit 3 , and the hoop wire 8 passes through the hoop rings 7 closest to the folded portion on all the braided fabric units 3 and is fastened, thereby forming an open structure 4 .

[0054] When the three-dimensional defogger mesh cover disclosed in the present application is actually used, the diameter of the required opening structure 4 is first determined. If no opening is required, a plurality of fan-shaped woven fabric units 3 are directly spliced ​​together to obtain a circular cover body 1. If an opening is required, the fan-shaped woven fabric unit 3 is folded according to the radius of the opening, and the connecting rope 5 is fastened to the connecting ring 6 to prevent the folded part from reopening. In addition, the hoop rope 8 is passed through the hoop ring 7 closest to the folded part on all the woven fabric units 3 and fastened, so that the diameter of the opening structure 4 is fixed, and the change in the diameter of the opening structure 4 caused by external force is prevented from affecting the cooling performance and water-saving effect of the cooling tower. When the diameter of the opening structure 4 needs to be adjusted, it is only necessary to untie the hoop rope 8, adjust the folded position of the woven fabric unit 3, and then re-tighten the connecting rope 5 and the hoop rope 8.

[0055] The woven fabric unit 3 is composed of a plurality of fan-shaped pieces 9; Two adjacent fan-shaped panels 9 are fixedly connected by a binding belt.

[0056] As a further implementation of this embodiment, a hoop tube 10 is provided on the inner side of the fan-shaped cutting piece 9; The hoop rope 8 passes through the hoop tube 10 on the fan-shaped panels 9 at the innermost ends of all the woven fabric units 3 and is fastened to form a stable open structure 4.

[0057] When the three-dimensional defogger mesh cover disclosed in the present application is actually used, the diameter of the required opening structure 4 is first determined, and multiple fan-shaped pieces 9 are fixedly connected by bindings according to the size of the opening structure 4 to form a woven fabric unit 3, and then the multiple woven fabric units 3 are arranged and connected in the circumferential direction. The specific connection method can adopt the connection structure in Example 2, which will not be repeated here. When the size of the opening structure 4 needs to be adjusted, it is only necessary to increase or decrease the inner pieces on the original basis. In order to enhance the stability of the opening structure 4, a hoop 10 is provided on the inner side of the fan-shaped piece 9. The hoop passes through the hoop 10 on the fan-shaped piece 9 at the innermost end of all the woven fabric units 3 and is tightened so that the shape and size of the opening structure 4 are constrained, thereby preventing the change in the diameter of the opening structure 4 caused by external force from affecting the cooling performance and water-saving effect of the cooling tower.

[0058] By adopting the above technical solution, the beneficial effects of this application are as follows: (1) By installing a defogger, the droplets and plumes in the hot and humid air flow can be effectively blocked and refluxed, reducing the waste of water resources and significantly improving the water-saving performance of the cooling tower.

[0059] (2) The inner diameter of the cover is an opening structure, which can be combined with Example 1 and the ventilation volume can be adjusted according to the cooling load of the cooling tower. The size of the opening structure can be achieved by adjusting the connecting rope and the hoop rope, which can flexibly adapt to different work requirements.

[0060] (3) A variety of composite materials such as three-dimensional woven nylon mesh, polyester mesh, etc. are used. These materials have the characteristics of high strength and wear resistance, ensuring the stability and durability of the defogger cover in harsh environments.

[0061] (4) The cover body and the support frame can be connected in one piece or installed separately, which is convenient for arrangement inside or outside the top of the cooling tower. At the same time, the woven fabric units are connected by a connecting structure (such as sewing, welding or bonding), which simplifies the installation and disassembly process.

[0062] (5) This technical solution is not only applicable to different types of cooling towers, but can also adjust the shape, size and material of the cover according to actual needs to adapt to different working environments and water-saving requirements.

[0063] (6) The cover body is formed by splicing a plurality of fan-shaped woven fabric units, and the opening is fixed by structures such as hoops and hoop ropes, thereby enhancing the overall mechanical properties and stability of the cover body, while optimizing the flow field of the cooling tower and improving the cooling efficiency.

[0064] 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for designing an opening adjustment of a demisting screen, characterized in that: Includes steps: S1: In order to ensure the cooling efficiency of the mechanical ventilation cooling tower and the energy balance of the system, the opening design of the mist removal mesh cover needs to consider the heat exchange enthalpy value of the cooling tower. Water exchanges heat by contacting with the air, and part of the water evaporates to take away the latent heat, thereby achieving a cooling effect. In the enthalpy difference method, the basic thermal calculation equation of the cooling tower is expressed as: （1） in: It is the cooling number or exchange number, which indicates the cooling capacity of the cooling tower; is the heat dissipation of water, in kilowatts (kW); is the air volume of the cooling tower in kilograms per second (kg / s).

2. The method for designing the opening adjustment of the demisting screen according to claim 1, characterized in that: Includes steps: S2: The heat dissipation Q is calculated as follows: （2） in: is the specific heat capacity of water, which is 4.18 kJ / kg°C; is the mass flow rate of circulating water in kilograms per second (kg / s); is the temperature difference between the inlet and outlet water in degrees Celsius (°C).

3. The method for designing the opening adjustment of the demisting screen according to claim 2, characterized in that: Includes steps: S3: Ventilation volume Calculated by: （3） Where: is the ventilation area m2; is the wind speed m / s; is the vent radius in m.

4. The method for designing the opening adjustment of the demisting screen according to claim 3, characterized in that: Includes steps: S4: To ensure that the cooling effect remains unchanged before and after the installation of the water removal screen, the cooling tower ventilation volume ( ) must remain unchanged, so we can get: （4） Where: , The ventilation area of ​​the mesh cover is m2 and the opening area is m2; , The wind speed at the mesh is m / s, and the wind speed at the opening is m / s; is the opening radius m.

5. The method for designing the opening adjustment of the demisting screen according to claim 4, characterized in that: Includes steps: S5: By simplifying equation (4), we can get 。 6. The method for designing the opening adjustment of the demisting screen according to claim 5, characterized in that: Includes steps: S6: The difference in ambient wind speed and temperature will affect the opening design of the defogger screen; After many tests, it was verified that the design range of the defogger screen diameter is as follows: Where: d is the upper diameter of the defogger screen; d 1 is the cooling tower wind tube diameter (the lower end diameter of the demisting mesh cover); d 2 is the opening diameter; k For experience value, usually ; The opening diameter design of the defogger screen within this range has little impact on the ventilation volume and can maintain the cooling efficiency and energy balance of the system.

7. The method for designing the opening adjustment of the demisting screen according to claim 1, characterized in that: The cooling number refers to the amount of heat that can be transferred by a unit volume of filler in a cooling tower under specific operating conditions at a unit temperature difference; The cooling number is an important parameter for evaluating the performance of cooling towers, which is related to factors such as the design of the cooling tower, operating conditions, and environmental parameters; If the cooling number of the cooling tower remains unchanged over a period of time, it means that the operating conditions and environmental parameters of the cooling tower have not changed significantly during this period of time, or the design and operation of the cooling tower have reached a stable state.

Images