A packing support beam upper-mounted natural draft cooling tower and application thereof

Abstract

The application provides a filler support beam upper type natural ventilation cooling tower and application thereof, and the filler support beam upper type natural ventilation cooling tower comprises a filler, a bracket, a filler support beam and a water distribution pipe; the bracket is arranged on the filler support beam; the filler is hung below the filler support beam through the bracket; and the water distribution pipe is arranged on the filler support beam and distributes water to the filler through the filler. The application changes the existing filler installation position from the upper part of the filler support beam to the lower part of the filler support beam, does not change the structure of the filler support beam, can increase the longitudinal space between the filler and the water distribution pipe, can avoid foreign matter blockage and microbial pollution in the air flow dead zone, solves the common filler blockage problem in the support beam area of the existing natural ventilation cooling tower, prolongs the service life of the filler, and has low overall transformation cost.

Description

Technical Field

[0001] This invention relates to the field of cooling tower technology, and in particular to a natural draft cooling tower with a packing support beam on top and its application. Background Technology

[0002] After hot water enters the natural draft cooling tower, it is atomized by nozzles into droplets that are sprayed onto the packing material below the nozzles. A downward-flowing water film forms on the packing material's wall, exchanging heat with the cold air passing upwards from below the packing material and thus being cooled. The quality of the hot water atomization directly affects the thickness and uniformity of the water film distribution on the packing material wall. A thin and uniform water film facilitates sufficient heat exchange with the cold air. The nozzle's structure and the inlet hot water pressure directly influence the atomization effect. For the same nozzle, higher inlet hot water pressure results in finer and more uniformly distributed droplets; lower inlet hot water pressure results in larger and less uniform droplets.

[0003] Existing natural draft cooling towers are limited by the space between the nozzles and the packing material, resulting in a small distance of only 0.2 to 0.3 meters between the nozzles and the water distribution branch pipes. Under low flow conditions, the hot water pressure in the distribution pipes drops, and the nozzles rely primarily on the water column formed by the elevation difference between the nozzles and the distribution pipes to maintain the inlet hot water pressure. This small elevation difference leads to low inlet hot water pressure, significantly reducing the nozzle atomization effect and severely impacting the cooling tower's cooling efficiency.

[0004] Meanwhile, natural draft cooling towers are designed with numerous large packing support beams, which occupy 11-16% of the cooling tower's ventilation cross-sectional area. Because these support beams obstruct the upward flow of cold air, the packing material accumulating above them creates localized dead zones in airflow. Debris, dust, and microorganisms from the hot water fall into these areas from the top of the packing and cannot escape due to the obstruction of the support beams. Over time, these microorganisms grow in the humid and hot environment, contaminating and blocking the flow channels of adjacent packing material, hindering the circulation of hot water and cold air, affecting heat exchange, and thus reducing the cooling tower's cooling efficiency.

[0005] CN206583322U discloses a novel fillerless spray-type natural ventilation cooling tower, comprising a reinforced concrete tower, a water collector, atomizing nozzles, a hot water distribution system, a hot water inlet, vertical reinforcing ribs, diagonal columns, a hot water riser pipe, and a water tank. The bottom of the reinforced concrete tower is provided with a water tank, which is connected to the hot water inlet. The hot water inlet is connected to the hot water riser pipe, and the upper end of the hot water riser pipe is connected to the hot water distribution system. The hot water distribution system has multiple atomizing nozzles evenly distributed. A water collector is provided in the middle part of the interior of the reinforced concrete tower.

[0006] CN207379318U discloses a hyperbolic natural draft cooling tower with cold condensate defogging function, including a hyperbolic tower body, a natural cooling tower air inlet, and a water distribution device. The air inlet is located on the lower side of the hyperbolic tower body. A wind-cooled condensate water collection device is located above the water distribution device, and a cold air extraction and supply device is located outside the hyperbolic tower body. The wind-cooled condensate water collection device is supplied with low-temperature cooling air by the cold air extraction and supply device. The low-temperature air is introduced into the hollow heat-conducting shell and undergoes sufficient heat exchange before being discharged into the inner cavity of the tower neck. In this way, the temperature of the hollow heat-conducting shell is always close to the outside temperature. When high-temperature saturated water vapor encounters the low-temperature hollow heat-conducting shell, it will quickly condense into water droplets, becoming clean water. It has a simple structure, can eliminate fog and save water, is energy-saving and environmentally friendly, and can also obtain pure fresh water. At the same time, it improves the natural exhaust performance of the cooling tower, increases the exhaust pressure, reduces ventilation resistance, and improves the cooling effect.

[0007] CN208620865U discloses a natural draft wet cooling tower, relating to the field of thermal power plant equipment. It provides a natural draft wet cooling tower with good cooling effect. The packing layer is divided into an inner zone packing layer and an outer zone packing layer from the inside to the outside along the radius of the cooling tower. The packing height of the outer zone packing layer is higher than that of the inner zone packing layer. The packing layer is provided with packing holes, and the spacing of the packing holes decreases from the inside to the outside along the radius of the cooling tower. A frame is provided on the rain zone, and the packing layer is connected to the frame of the rain zone through a connecting structure. This increases the heat dissipation capacity of the outer zone packing layer and reduces the airflow resistance of the inner zone packing layer, fully utilizing the heat transfer performance of the packing inside the cooling tower, improving the aerodynamic field inside the cooling tower, and achieving optimal matching between the internal air distribution and the packing, thereby improving heat dissipation efficiency and increasing the cooling efficiency of the cooling tower.

[0008] However, all of the above-mentioned cooling towers require large-scale modifications to the original cooling towers, which is costly. Summary of the Invention

[0009] In view of the problems existing in the prior art, the present invention provides a natural draft cooling tower with a top-mounted packing support beam and its application. The existing packing installation position is changed from the upper part of the packing support beam to the lower part of the packing support beam without changing the structure of the packing support beam. This can increase the longitudinal space between the packing and the water distribution pipe, and avoid foreign object blockage and microbial contamination in the dead air flow zone. It solves the common problem of packing blockage in the support beam area of ​​existing natural draft cooling towers, extends the service life of the packing, and has low overall modification cost.

[0010] To achieve this objective, the present invention adopts the following technical solution:

[0011] In a first aspect, the present invention provides a natural draft cooling tower with a top-mounted support beam, the natural draft cooling tower with a top-mounted support beam including packing, a bracket, a packing support beam and a water distribution pipe;

[0012] The bracket is mounted on the filler support beam;

[0013] The packing material is suspended below the packing support beam by a bracket;

[0014] The water distribution pipe passes through the packing and distributes water to the packing on the packing support beam.

[0015] The natural draft cooling tower with a top-mounted packing support beam described in this invention suspends the packing material below the packing support beam via brackets. This increases the longitudinal space between the packing material and the water distribution pipe, facilitating optimized nozzle arrangement. It also prevents blockage by foreign objects and microbial contamination in dead air zones, extending the packing material's lifespan and improving the cooling tower's efficiency. Furthermore, since no packing material is placed in the lower projection area of ​​the packing support beam, the total packing material usage can be reduced by 11-16%, saving 13% on packing replacement costs.

[0016] Preferably, the filler support beam is made of reinforced concrete.

[0017] In this invention, the packing support beam is a reinforced concrete beam constructed within a natural draft cooling tower, specifically designed to support the weight of the packing material and the cooling water adhering to its surface. This invention does not alter the structure of the packing support beam; it simply changes the placement of the packing material from above the beam to suspending it below it.

[0018] Preferably, the water distribution pipe includes a main water distribution pipe, a first water distribution branch pipe, and a second water distribution branch pipe.

[0019] Preferably, the main water supply pipe is connected to the first branch water supply pipe.

[0020] Preferably, the first water distribution branch pipe is connected to the second water distribution branch pipe.

[0021] Preferably, the water distribution header passes through the packing material.

[0022] Preferably, the diameters of the main water distribution pipe, the first water distribution branch pipe, and the second water distribution branch pipe decrease sequentially.

[0023] Preferably, the second water distribution branch pipe includes an extension pipe and a nozzle.

[0024] Preferably, the length of the extension tube is 0.4 to 0.6 m, for example, 0.4 m, 0.45 m, 0.5 m, 0.55 m, 0.58 m or 0.6 m, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0025] Preferably, the elevation difference between the second water distribution branch pipe and the sprinkler head is 0.7 to 0.8 m, for example, it can be 0.7 m, 0.73 m, 0.75 m, 0.78 m, 0.79 m or 0.8 m, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0026] This invention creates favorable conditions for increasing the elevation difference between the nozzle and the second water distribution branch pipe by suspending the packing material under the packing material support beam. By setting an extended pipe, the elevation difference between the second water distribution branch pipe and the nozzle is 0.7–0.8 m. This ensures that even under low-flow conditions in the natural draft cooling tower, when the hot water pressure in the distribution pipe is low, the nozzle can still achieve good atomization by relying solely on the water column pressure in the inlet pipe between the distribution pipe and the nozzle.

[0027] Preferably, a water spray plate is provided below the nozzle, which can break the water column generated in the second water distribution pipe into water droplets, thereby enhancing the atomization effect.

[0028] In a second aspect, the present invention also provides an application of the natural draft cooling tower with a top-mounted packing support beam as described in the first aspect, wherein the natural draft cooling tower with a top-mounted packing support beam is used for hot water cooling.

[0029] Preferably, the natural draft cooling tower with the packing support beam is used for cooling hot water with a single pump operating flow rate of 35% to 45% of the design flow rate in the water distribution pipe. For example, it can be 35%, 36%, 38%, 40%, 43%, or 45%, etc., but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0030] The natural draft cooling tower with top-mounted packing support beam described in this invention has a larger elevation difference between the second water distribution branch pipe and the nozzle, resulting in better hot water abrasion by the cooling tower nozzle, forming finer water droplets with a more uniform particle size distribution. Therefore, the natural draft cooling tower with top-mounted packing support beam has a good cooling effect on hot water and high cooling efficiency, especially when the hot water pressure in the distribution pipe is low under low flow conditions, the cooling effect is even more significant.

[0031] Compared with the prior art, the present invention has at least the following beneficial effects:

[0032] (1) The natural draft cooling tower with the packing support beam provided by the present invention suspends the packing below the packing support beam through the bracket, which makes little change to the original natural draft cooling tower, has low modification cost, and effectively solves the problem of packing blockage in the support beam area of ​​existing natural draft cooling towers. The packing has a long service life and the cooling tower has high cooling efficiency.

[0033] (2) The natural draft cooling tower with the packing support beam on top provided by the present invention does not arrange packing in the lower projection area of ​​the packing support beam, which can reduce the amount of packing used in the whole tower by 11 to 16%, and also reduce the cost of packing replacement.

[0034] (3) The natural ventilation cooling tower with packing support beam provided by the present invention has a better cooling effect when the hot water pressure in the water distribution pipe is low under small flow conditions, and is suitable for large-scale promotion and application. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the natural draft cooling tower with top-mounted packing support beam provided in Example 1.

[0036] Figure 2 This is a schematic diagram of a natural draft cooling tower with a top-mounted packing support beam provided in Comparative Example 1.

[0037] In the diagram: 1-First water distribution branch pipe; 2-Sprinkler head; 3-Packing support beam; 4-Packing material; 5-Extension pipe; 6-Bracket; 7-Water distribution main pipe; 8-Sprinkler tray; 9-Airflow dead zone. Detailed Implementation

[0038] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0039] The present invention will now be described in further detail. However, the examples described below are merely simplified examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention is determined by the claims.

[0040] It should be understood that in the description of this invention, the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0041] It should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] Example 1

[0043] This embodiment provides a natural draft cooling tower with a packing support beam mounted on top, as shown in the schematic diagram below. Figure 1 As shown.

[0044] The above-supported natural draft cooling tower includes packing 4, bracket 6, packing support beam 3, and water distribution pipe;

[0045] The bracket 6 is mounted on the filler support beam 3;

[0046] The packing material 4 is suspended below the packing material support beam 3 by a bracket 6;

[0047] The water distribution pipe passes through the packing 4 and distributes water to the packing 4 on the packing support beam 3.

[0048] The filler support beam 3 is made of reinforced concrete.

[0049] The water distribution pipe includes a main water distribution pipe 7, a first water distribution branch pipe 1, and a second water distribution branch pipe;

[0050] The main water distribution pipe 7 is connected to the first branch water distribution pipe 1;

[0051] The first water distribution branch pipe 1 is connected to the second water distribution branch pipe.

[0052] The water distribution main pipe 7 passes through the packing 4.

[0053] The diameters of the main water distribution pipe 7, the first water distribution branch pipe 1, and the second water distribution branch pipe decrease sequentially.

[0054] The second water distribution branch pipe includes an extension pipe 5 and a nozzle 2.

[0055] The length of the extended tube 5 is 0.5m;

[0056] The elevation difference between the first water distribution branch pipe 1 and the nozzle 2 is 0.8m.

[0057] A water spray plate 8 is provided below the nozzle 2.

[0058] In this embodiment, the natural draft cooling tower with the packing support beam suspended above the packing support beam uses brackets to suspend the packing material below the beam. This increases the longitudinal space between the packing material and the water distribution pipe, which is beneficial for optimizing the nozzle arrangement. It also avoids blockage by foreign objects and microbial contamination in dead air zones, extending the packing material's lifespan and improving the cooling tower's efficiency. The cooling effect is particularly significant for low-flow-rate hot water in the distribution pipe, where the pressure is lower. Furthermore, since no packing material is placed in the lower projection area of ​​the packing support beam, the total packing material usage is reduced by 16%, saving 13% on packing replacement costs.

[0059] Comparative Example 1

[0060] This comparative example provides a natural draft cooling tower, the schematic diagram of which is shown below. Figure 2 As shown.

[0061] The natural draft cooling tower includes packing material 4, bracket 6, packing support beam 3, and water distribution pipe;

[0062] The bracket 6 is mounted on the filler support beam 3;

[0063] The filler 4 is positioned above the filler support beam 3;

[0064] The water distribution pipe passes through the packing 4 and distributes water to the packing 4 on the packing support beam 3.

[0065] The filler support beam 3 is made of reinforced concrete.

[0066] The water distribution pipe includes a main water distribution pipe 7, a first water distribution branch pipe 1, and a second water distribution branch pipe;

[0067] The main water distribution pipe 7 is connected to the first branch water distribution pipe 1;

[0068] The first water distribution branch pipe 1 is connected to the second water distribution branch pipe.

[0069] The water distribution main pipe 7 passes through the packing 4.

[0070] The diameters of the main water distribution pipe 7, the first water distribution branch pipe 1, and the second water distribution branch pipe decrease sequentially.

[0071] The second water distribution branch pipe includes a nozzle 2.

[0072] The elevation difference between the first water distribution branch pipe 1 and the nozzle 2 is 0.2m.

[0073] A water spray plate 8 is provided below the nozzle 2.

[0074] In this comparative example, the natural draft cooling tower packing is placed on top of the packing support beam. This arrangement not only encroaches on the longitudinal space between the packing and the water distribution pipe, but also blocks the lower flow channel of the packing in the contact area between the packing support beam and the packing. After long-term operation, this can easily lead to blockage by foreign objects and microbial contamination in the dead zone 9 of airflow. Moreover, since the elevation difference between the nozzle and the water distribution pipe is only 0.2m, the atomization and cooling effect of the hot water in the water distribution pipe under low flow conditions is poor.

[0075] The applicant declares that the detailed structural features of the present invention are illustrated through the above embodiments, but the present invention is not limited to the above detailed structural features, that is, it does not mean that the present invention must rely on the above detailed structural features to be implemented. Those skilled in the art should understand that any improvements to the present invention, equivalent substitutions for the components selected in the present invention, additions of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

[0076] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

Claims

1. A natural draft cooling tower with a top-mounted packing support beam, characterized in that, The above-supported natural draft cooling tower includes packing, brackets, packing support beams, and water distribution pipes; The bracket is mounted on the filler support beam; The packing material is suspended below the packing support beam by a bracket; The water distribution pipe passes through the packing and distributes water to the packing on the packing support beam; The water distribution pipe includes a water distribution main pipe, a first water distribution branch pipe and a second water distribution branch pipe. The water distribution main pipe is connected to the first water distribution branch pipe and the first water distribution branch pipe is connected to the second water distribution branch pipe. The water distribution main pipe passes through the packing material; The second water distribution branch pipe includes an extension pipe and a nozzle; The length of the extension pipe is 0.4 to 0.6 m, and the elevation difference between the first water distribution branch pipe and the nozzle is 0.7 to 0.8 m.

2. The natural draft cooling tower with a support beam as described in claim 1, characterized in that, The filler support beam is made of reinforced concrete.

3. The natural draft cooling tower with a support beam as described in claim 1, characterized in that, The diameters of the main water distribution pipe, the first water distribution branch pipe, and the second water distribution branch pipe decrease sequentially.

4. The natural draft cooling tower with a support beam as described in claim 1, characterized in that, A water spray tray is provided below the nozzle.

5. An application of a natural draft cooling tower with a top-mounted packing support beam as described in any one of claims 1 to 4, characterized in that, The natural draft cooling tower with the packing support beam is used for hot water cooling.

6. The application according to claim 5, characterized in that, The above-mounted natural draft cooling tower with packing support beam is used for hot water cooling in single-pump operation with a flow rate of 35-45% of the design flow rate.

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