A ventilation shaft water shielding and flow guiding device and method suitable for eight high towers

Abstract

The application provides a ventilation shaft water shielding and guiding device suitable for eight high towers, which comprises a cooling tower, a water distribution tank, a plurality of sprayers and a water collecting pool are arranged in the cooling tower, a guiding slope is arranged at an intermediate position of the cooling tower in a slanting manner, a plurality of cold water flow through openings are formed on the surface of the guiding slope, ventilation shafts are embedded and installed in the plurality of cold water flow through openings, guiding structures are installed in the ventilation shafts, taper guiding grooves are formed on the upper and lower ends of the guiding structures, the small end of the guiding groove is connected and communicated through a guiding hole, the large end faces outward, a flow straightener is threadedly fixed on the ventilation shaft through a plurality of groups of stainless steel supports, the upper and lower surfaces of the flow straightener are arranged as arc spherical surfaces, and the arc spherical surface of the lower surface of the flow straightener extends above the guiding groove; the application solves the problems of the prior art, such as complex structure, large noise caused by high water level, and easy back blowing of cooling water by reverse wind flow, and realizes no water leakage of high towers, better noise reduction effect and energy saving.

Description

Technical Field

[0001] This invention belongs to the technical field of cooling tower equipment, specifically relating to a water-blocking and diversion device and method for a ventilation shaft of an eight-story cooling tower. Background Technology

[0002] To achieve energy conservation and environmental improvement, wet counter-flow natural draft cooling towers are widely used in the circulating water systems of steam turbine generator sets in industries such as thermal power generation. After a long period of use with conventional structures, a major revolutionary innovation has finally arrived—the elevated water collection cooling tower. Historically used conventional wet counter-flow natural draft cooling towers have a water collection pool below their water-spraying packing. Cooled circulating water falls from the bottom of the packing into the collection pool, completely eliminating return water pressure. Furthermore, the noise from the falling water from a certain height has a significant environmental impact, and there is also water waste due to wind loss. The elevated water collection cooling tower raises the water collection pool from below ground level to above the air inlet. Utilizing the height potential energy of the elevated water collection pool (or tank), it reduces the operating energy consumption of the circulating water pump, while significantly reducing falling water noise and wind loss, and saving makeup water. However, the high-level water collection cooling tower is composed of a high-level water collection trough, water collection inclined plate and water baffle plate. In operation practice, it has been found that the water leakage is quite serious, especially in cold regions where water leakage and freezing occur in winter, affecting the safe operation of the unit. Moreover, this structure is very inconvenient for inspection and maintenance.

[0003] The patent application with application number CN201610205749.9 describes an airflow guiding device and method for cooling towers. A congested area typically exists in the upper part of the tower, affecting the upward draft, air resistance, and consequently the overall airflow into the tower. The invention comprises: a tower (1), the bottom of which is connected to a water collection tank (2), a herringbone column (3) inside the water collection tank, the herringbone column being connected to the tower, a packing layer (4) at the bottom of the tower, a rain zone (5) between the packing layer and the water collection tank, an air inlet (6) circumferentially arranged in the rain zone, a noise reduction and guiding dual-function plate (7) circumferentially arranged in the air inlet, nozzles (9) arranged on the upper part of the packing layer, the nozzles being connected to a water distribution tank (8) above the packing layer, a water separator (10) arranged on the top plane of the water distribution tank, and an air guide device for the tower arranged above the water separator, the air guide device for the tower including a guide plate (11) or an air guide rail (12). The invention is applied to cooling tower air.

[0004] Although the aforementioned patent solved the problem of airflow within the cooling tower, during use, the sprayed cold water dripping from a height generates significant noise. Furthermore, when guiding the airflow, there is no effective flow restriction mechanism for the air rising from the water collection pool, which easily causes the dripping cold water to splash and blow back in all directions. Summary of the Invention

[0005] The present invention aims to solve the problems of complex structure, high noise caused by high water level, and easy backflow of cooling water when reverse airflow occurs in the existing technology. To this end, a water-blocking and diversion device and diversion method suitable for ventilation shafts of eight-story towers are provided.

[0006] The technical solution adopted by this invention to solve its technical problem is: A water-blocking and diversion device for ventilation shafts suitable for eight-story cooling towers includes a cooling tower. The cooling tower contains a water distribution trough, several sprayers, and a water collection tank. The water distribution trough is located at the top of the cooling tower, and the sprayers are evenly installed below it. The water collection tank is located at the bottom of the cooling tower. A diversion slope is inclined at the center of the cooling tower, and several cold water inlets are formed on the surface of the diversion slope. A ventilation shaft is embedded within each of the cold water inlets. A diversion structure is installed within the ventilation shaft. The diversion structure has conical diversion channels at both its upper and lower ends. The smaller ends of the diversion channels are connected via diversion holes, while the larger ends face outwards. A spherical hood is threadedly fixed to the upper end of the ventilation shaft using several sets of stainless steel brackets. The upper and lower surfaces of the spherical hood are arc-shaped spherical surfaces, with the lower surface extending above the diversion channels. The height of the lower surface of the spherical hood is higher than the height of the diversion channels.

[0007] Preferably, the lower edges on both sides of the fairing are provided with a buffer chamfer, which is a right-angle chamfer that is recessed.

[0008] Preferably, a plurality of air inlets are vertically opened on the lower outer side of the ventilation shaft, and the air inlets lead to the guide groove below.

[0009] Preferably, the guide groove is composed of a spiral groove.

[0010] Preferably, the guide channel is composed of several trapezoidal channels, which are vertically opened with the smaller end facing upward along the conical surface of the guide channel and the larger end facing downward along the conical surface of the guide channel.

[0011] A method for guiding water flow through a ventilation shaft water-blocking device applicable to an eight-tower tower, the method comprising: S1: Install the ventilation shaft with the flow guide structure inside the cold water inlet, keeping the upper plane of the ventilation shaft flush with the surface of the flow guide slope; S2: Turn on the sprayer to release the cold water in the water distribution tank for cooling spraying. The sprayed cold water droplets fall on the guide slope for guidance or spray on the fairing for guidance. S3: Cold water on the guide slope flows along the prescribed track in the upper guide channel and through the guide hole wall into the collection pool for collection; at the same time, the wind generated in the collection pool flows upward along the prescribed track in the lower guide channel and through the guide hole, realizing bidirectional flow.

[0012] Preferably, the cold water on the upper surface of the fairing is guided along the arc-shaped spherical surface of the fairing to the buffer chamfer at the edge for buffering, and then flows along the lower surface of the fairing and gradually drips into the upper guide channel, and flows along the prescribed track in the guide channel through the guide hole wall to be collected in the water collection tank.

[0013] Preferably, the slope ratio i of the guide slope is 0.075-0.095.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention sets the guide slope at the middle height of the cooling tower, which reduces the height of the cold water left by the guide slope during cooling, shortens the drip distance, and thus reduces noise; and a ventilation shaft is installed at the cold water flow outlet to direct the cooling water to flow in a directional manner along the guide channel; 2. A guide channel is also installed at the bottom of the ventilation shaft so that the air energy in the water collection pool can be discharged in a directional manner from the guide channel below, avoiding problems such as backflow and splashing of the airflow on the cooling water, reducing the loss of airflow and saving makeup water; 3. Install a fairing with an arc-shaped spherical surface above the ventilation shaft. This fairing has a guiding and buffering effect on the cooling water, preventing the sprayed cooling water from overflowing the cold water inlet when the flow rate on the guide slope is too large, thus causing the cold water to be discharged in time. It also has a guiding and buffering effect on the air flowing above the water collection tank, preventing the waste caused by the wind blowing back the cooling water. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the installation structure according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the flow guiding device in an embodiment of the present invention; Figure 3 This is a cross-sectional view of the flow guiding device in Embodiment 1 of the present invention; Figure 4 This is a cross-sectional view of the flow guiding device in Embodiment 2 of the present invention; Figure 5 This is a partial enlarged view of an embodiment of the present invention; The embodiments of this invention mainly include the following component symbols: Cooling tower-1, water distribution tank-101, sprayer-102, water collection pool-103, guide slope-2, cold water flow outlet-201, ventilation shaft-3, air inlet-301, guide structure-4, guide channel-401, spiral channel-402, trapezoidal channel-403, guide hole-410, stainless steel bracket-5, fairing-6, buffer chamfer-601. Detailed Implementation

[0017] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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 this invention.

[0018] Example 1 like Figure 1 and Figure 2 As shown, a water-blocking and diversion device for a ventilation shaft of an eight-story cooling tower includes a cooling tower 1. The cooling tower 1 contains a water distribution trough 101, several sprayers 102, and a water collection tank 105. The water distribution trough 101 is located at the top of the cooling tower 1, and the sprayers 102 are evenly installed below it. The water collection tank 105 is located at the bottom of the cooling tower 1. A diversion slope 2 is inclinedly arranged in the middle of the cooling tower 1, and several cold water inlets 201 are formed on the surface of the diversion slope 2. Each ventilation shaft 3 is embedded within the ventilation shaft 3, and a flow guiding structure 4 is installed inside the ventilation shaft 3. The flow guiding structure 4 has conical flow guiding grooves 401 at both the upper and lower ends. The small end of the flow guiding groove 401 is connected and communicated through the flow guiding hole 402, and the large end faces outward. The upper end of the ventilation shaft 3 is fixed with a shroud 6 by several sets of stainless steel brackets 5. The upper and lower surfaces of the shroud 6 are set as arc-shaped spherical surfaces. The arc-shaped spherical surface of the lower surface of the shroud 6 extends above the flow guiding groove 401, and the height of the lower surface of the shroud 6 is higher than the height of the surface of the flow guiding groove 401.

[0019] This invention places the guide slope 2 at the middle height of the cooling tower 1, reducing the height of the cold water leaving the guide slope 2 during cooling, shortening the drip distance, and thus reducing noise. Furthermore, a ventilation shaft 3 is installed at the cold water inlet 201, directing the cooling water flow along the guide channel 401. A guide channel 401 is also provided at the bottom of the ventilation shaft 3, allowing the airflow in the collection pool 105 to be discharged directionally from the lower guide channel 401, preventing backflow and splashing of the cooling water, reducing wind loss, and saving makeup water. A spherical shroud 6 is installed above the ventilation shaft 3, which guides and buffers the cooling water, preventing the sprayed cooling water from overflowing the cold water inlet 201 when the flow rate on the guide slope 2 is too high, thus preventing untimely cold water discharge. It also guides and buffers the airflow above the collection pool 105, preventing waste caused by backflow of cooling water.

[0020] like Figure 5As shown, the lower edges of both sides of the fairing 6 have buffer chamfers 601, which are right-angle chamfers that are recessed.

[0021] Several air inlets 301 are vertically opened on the lower outer side of the ventilation shaft 3, and the air inlets 301 lead to the guide groove 401 below.

[0022] like Figure 3 As shown, the guide channel 401 is composed of spiral grooves.

[0023] A method for guiding water flow through a ventilation shaft water-blocking device applicable to an eight-tower tower, the method comprising: S1: Install the ventilation shaft 3 equipped with the flow guiding structure 4 inside the cold water flow outlet 201, keeping the upper plane of the ventilation shaft 3 flush with the surface of the flow guiding slope 2; S2: Turn on the sprayer 102 to release the cold water in the water distribution tank 101 for cooling spraying. The sprayed cold water drips onto the guide slope 2 for guiding or sprays onto the rectifier 6 for guiding. S3: The cold water on the guide slope 2 flows along the prescribed track in the upper guide channel 401 through the wall of the guide hole 402 to the water collection pool 105 for collection; at the same time, the wind generated in the water collection pool 105 is discharged upward along the prescribed track in the lower guide channel 401 through the guide hole 402, realizing bidirectional flow.

[0024] After the cold water on the upper surface of the fairing 6 is guided along the arc-shaped spherical surface of the fairing 6 to the buffer chamfer 601 at the edge for buffering, the cold water flows along the lower surface of the fairing 6 and gradually drips into the upper guide channel 401. It then flows along the prescribed track in the guide channel 401 through the hole wall of the guide hole 402 and is collected in the water collection pool 105. The slope ratio i of the guide slope 2 is 0.075-0.095.

[0025] Example 2 like Figure 1 and Figure 2As shown, a water-blocking and diversion device for a ventilation shaft of an eight-story cooling tower includes a cooling tower 1. The cooling tower 1 contains a water distribution trough 101, several sprayers 102, and a water collection tank 105. The water distribution trough 101 is located at the top of the cooling tower 1, and the sprayers 102 are evenly installed below it. The water collection tank 105 is located at the bottom of the cooling tower 1. A diversion slope 2 is inclinedly arranged in the middle of the cooling tower 1, and several cold water inlets 201 are formed on the surface of the diversion slope 2. Each ventilation shaft 3 is embedded within the ventilation shaft 3, and a flow guiding structure 4 is installed inside the ventilation shaft 3. The flow guiding structure 4 has conical flow guiding grooves 401 at both the upper and lower ends. The small end of the flow guiding groove 401 is connected and communicated through the flow guiding hole 402, and the large end faces outward. The upper end of the ventilation shaft 3 is fixed with a shroud 6 by several sets of stainless steel brackets 5. The upper and lower surfaces of the shroud 6 are set as arc-shaped spherical surfaces. The arc-shaped spherical surface of the lower surface of the shroud 6 extends above the flow guiding groove 401, and the height of the lower surface of the shroud 6 is higher than the height of the surface of the flow guiding groove 401.

[0026] This invention places the guide slope 2 at the middle height of the cooling tower 1, reducing the height of the cold water leaving the guide slope 2 during cooling, shortening the drip distance, and thus reducing noise. Furthermore, a ventilation shaft 3 is installed at the cold water inlet 201, directing the cooling water flow along the guide channel 401. A guide channel 401 is also provided at the bottom of the ventilation shaft 3, allowing the airflow in the collection pool 105 to be discharged directionally from the lower guide channel 401, preventing backflow and splashing of the cooling water, reducing wind loss, and saving makeup water. A spherical shroud 6 is installed above the ventilation shaft 3, which guides and buffers the cooling water, preventing the sprayed cooling water from overflowing the cold water inlet 201 when the flow rate on the guide slope 2 is too high, thus preventing untimely cold water discharge. It also guides and buffers the airflow above the collection pool 105, preventing waste caused by backflow of cooling water.

[0027] like Figure 5 As shown, the lower edges of both sides of the fairing 6 have buffer chamfers 601, which are right-angle chamfers that are recessed.

[0028] Several air inlets 301 are vertically opened on the lower outer side of the ventilation shaft 3, and the air inlets 301 lead to the guide groove 401 below.

[0029] like Figure 4 As shown, the guide channel 401 is composed of several trapezoidal channels, which are vertically opened, with the small end facing upward along the conical surface of the guide channel 401 and the large end facing downward along the conical surface of the guide channel 401.

[0030] A method for guiding water flow through a ventilation shaft water-blocking device applicable to an eight-tower tower, the method comprising: S1: Install the ventilation shaft 3 equipped with the flow guiding structure 4 inside the cold water flow outlet 201, keeping the upper plane of the ventilation shaft 3 flush with the surface of the flow guiding slope 2; S2: Turn on the sprayer 102 to release the cold water in the water distribution tank 101 for cooling spraying. The sprayed cold water drips onto the guide slope 2 for guiding or sprays onto the rectifier 6 for guiding. S3: The cold water on the guide slope 2 flows along the prescribed track in the upper guide channel 401 through the wall of the guide hole 402 to the water collection pool 105 for collection; at the same time, the wind generated in the water collection pool 105 is discharged upward along the prescribed track in the lower guide channel 401 through the guide hole 402, realizing bidirectional flow.

[0031] After the cold water on the upper surface of the fairing 6 is guided along the arc-shaped spherical surface of the fairing 6 to the buffer chamfer 601 at the edge for buffering, the cold water flows along the lower surface of the fairing 6 and gradually drips into the upper guide channel 401. It then flows along the prescribed track in the guide channel 401 through the hole wall of the guide hole 402 and is collected in the water collection pool 105. The slope ratio i of the guide slope 2 is 0.075-0.095.

[0032] In summary, the two embodiments described above overcome the common problem of water leakage in general high-level water collection cooling towers, eliminating components such as high-level water collection troughs, water collection ramps, and baffles, making the structure simpler and more reasonable, and making the eight-tower more efficient, energy-saving, and environmentally friendly.

[0033] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A water-blocking and diversion device for a ventilation shaft of an eight-story cooling tower, comprising a cooling tower (1), wherein the cooling tower (1) is provided with a water distribution trough (101), a plurality of sprayers (102) and a water collection tank (105), the water distribution trough (101) is located at the top of the cooling tower (1), the plurality of sprayers (102) are evenly installed below the water distribution trough (101), and the water collection tank (105) is located at the bottom of the cooling tower (1), characterized in that: The cooling tower (1) is provided with a guide slope (2) at the middle position. Several cold water flow ports (201) are opened on the surface of the guide slope (2). A ventilation shaft (3) is embedded in each of the cold water flow ports (201). A guide structure (4) is installed in the ventilation shaft (3). A conical guide groove (401) is opened at both the upper and lower ends of the guide structure (4). The small end of the guide groove (401) is connected through the guide hole (410), and the large end faces outward. A shroud (6) is threadedly fixed to the upper end of the ventilation shaft (3) by several sets of stainless steel brackets (5). The upper and lower surfaces of the shroud (6) are set as arc-shaped spherical surfaces. The arc-shaped spherical surface of the lower surface of the shroud (6) extends to the top of the guide groove (401). The height of the lower surface of the shroud (6) is higher than the height of the surface of the guide groove (401).

2. The ventilation shaft water-blocking and diversion device according to claim 1, characterized in that: The fairing (6) has a buffer chamfer (601) on both sides of the lower edge. The buffer chamfer (601) is a right-angle chamfer that is recessed.

3. The ventilation shaft water-blocking and diversion device according to claim 2, characterized in that: The ventilation shaft (3) has several air inlets (301) vertically opened on the lower outer side, and the air inlets (301) lead to the guide groove (401) below.

4. The ventilation shaft water-blocking and diversion device according to claim 3, characterized in that: The guide channel (401) is composed of a spiral groove (402).

5. The ventilation shaft water-blocking and diversion device according to claim 3, characterized in that: The guide channel (401) is composed of several trapezoidal channels (403), which are vertically opened with the small end facing upward along the conical surface of the guide channel (401) and the large end facing downward along the conical surface of the guide channel (401).

6. A diversion method applicable to the water-blocking and diverting device of the ventilation shaft as described in claim 1, characterized in that, The method includes: S1: Install the ventilation shaft (3) equipped with the flow guiding structure (4) inside the cold water flow outlet (201) and keep the upper plane of the ventilation shaft (3) flush with the surface of the flow guiding slope (2); S2: Turn on the sprayer (102) to release the cold water in the water distribution tank (101) for cooling spraying. The sprayed cold water drips onto the guide slope (2) for guiding or sprays onto the rectifier (6) for guiding. S3: The cold water on the guide slope (2) flows along the prescribed track in the upper guide channel (401) through the hole wall of the guide hole (410) to the water collection pool (105) for collection; at the same time, the wind generated in the water collection pool (105) is discharged upward through the guide hole (410) along the prescribed track in the lower guide channel (401), realizing bidirectional flow.

7. The diversion method according to claim 6, characterized in that, The method further includes: after the cold water on the upper surface of the shroud (6) is guided along the arc-shaped spherical surface of the upper surface of the shroud (6) to the buffer chamfer (601) at the edge for buffering, the cold water flows along the lower surface of the shroud (6) and gradually drips into the upper guide groove (401), and flows through the guide hole (410) along the prescribed track in the guide groove (401) to the water collection pool (105) for collection.

8. The diversion method according to claim 6, characterized in that, The method further includes: the slope ratio i of the guide slope (2) is 0.075-0.095.

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