Large cross-flow closed cooling tower

Abstract

The large cross-flow closed cooling tower comprises a supporting framework of a square structure, the supporting framework is installed in a water pool, and air inlets are symmetrically formed in the left side and the right side of the supporting framework; a plurality of heat exchange modules which are arranged in a step shape are installed in the supporting framework, the whole heat exchange modules are of a V-shaped structure, air inlets are formed in the left side and the right side of the V-shaped structure, each heat exchange module comprises a spraying pipe, a heat exchange pipe bundle and filler which are sequentially arranged from top to bottom, and a plurality of nozzles which are evenly distributed are installed at the bottom of each spraying pipe; and an air duct is installed in the middle of the top of the supporting framework, a fan is arranged in the air duct, the fan exhausts air upwards, and a horizontally-arranged water collector is installed between the heat exchange module and the fan. The large-scale cross-flow closed cooling tower provided by the invention can solve the problem that a plurality of small-scale cross-flow closed towers are operated in parallel to occupy a large area, has the advantages of low energy consumption, low investment and convenience in operation and maintenance, and is particularly suitable for a large-scale circulating water system and a working condition with low approximation degree.

Description

Technical Field

[0001] The invention relates to a large-scale cross-flow closed cooling tower, belonging to the technical field of cooling towers. Background Art

[0002] Closed cooling tower, also known as closed cooling tower for short, is a tower that places a tubular heat exchanger inside the tower. It sprays water onto the surface of the heat exchange tube to evaporate and exchange heat to achieve the purpose of cooling. Because it is a closed cycle, it can ensure that the water quality is not polluted, which well protects the efficient operation of the main equipment and increases its service life.

[0003] At present, large closed cooling towers are generally concrete and steel countercurrent towers, with spray water and air for reverse heat exchange. This type of closed cooling tower has a large heat exchange area, high investment cost, and poor heat exchange effect in summer, especially in some working conditions where the difference between the outlet water temperature and the wet bulb temperature is within 5°C, the efficiency of the countercurrent closed tower is very low.

[0004] At present, the structure of cross-flow closed cooling towers is relatively small, and the water volume processed by a single device is small. When used in large-scale circulating water systems, multiple devices need to be operated in parallel, which has the problems of large floor space, high fan energy consumption, high investment cost, and difficult operation and maintenance. In addition, cross-flow closed cooling towers mostly use corrugated water collectors to recover droplets in the humid air flow. This water collection method collects water by changing the direction of the wind, which has a large resistance to the fan and increases the fan energy consumption.

[0005] In summary, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to propose a large cross-flow closed cooling tower to solve the bottleneck of the existing technology. Summary of the invention

[0006] In view of the deficiencies in the background technology, the present invention provides a large cross-flow closed cooling tower, which can solve the problem of large floor space occupied by multiple small cross-flow closed towers operating in parallel, has the advantages of low energy consumption, low investment and convenient operation and maintenance, and is particularly suitable for use in large circulating water systems and working conditions with low proximity.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions: A large cross-flow closed cooling tower comprises a square support frame, the support frame is installed inside a water pool, and air inlets are symmetrically arranged on the left and right sides of the support frame; A plurality of heat exchange modules arranged in a ladder shape are installed inside the support frame. The plurality of heat exchange modules are in a V-shaped structure as a whole, and the air inlets are located on the left and right sides of the V-shaped structure. An air duct is installed in the middle of the top of the supporting frame, and a fan is installed in the air duct, and the fan draws air upwards; A horizontally arranged water collector is installed between the heat exchange module and the fan. The water collector has a honeycomb structure as a whole and is composed of a plurality of water collecting units spliced ​​together.

[0008] Furthermore, the bottom of the pool is located below the ground, and the top open end of the pool is located above the ground.

[0009] Furthermore, a plurality of circulating water pumps are installed outside the water pool, and the circulating water pumps are installed on the ground. The circulating water pumps are arranged one by one with the heat exchange modules. The inlet end of the circulating water pump is connected to the water pool, and the outlet end of the circulating water pump is connected to the spray pipe through a pipeline.

[0010] Furthermore, all positions of the support frame except the air inlet are covered with an outer protective plate.

[0011] Furthermore, the fan is supported by a column at the bottom thereof, and the column is fixed to the bottom of the pool in a vertical direction.

[0012] Furthermore, the water collecting unit includes an external hexagonal cylinder, a hollow cylinder is arranged inside the hexagonal cylinder, a plurality of blades evenly distributed are arranged between the hexagonal cylinder and the hollow cylinder, the blades are arranged at an angle, and a swirl gap is arranged between adjacent blades.

[0013] Furthermore, the heat exchange module includes a spray pipe, a heat exchange tube bundle and a filler which are arranged in sequence from top to bottom, and a plurality of evenly distributed nozzles are installed at the bottom of the spray pipe.

[0014] Furthermore, the heat exchange tube bundle is a serpentine structure, and adjacent heat exchange tube bundles are arranged in a staggered manner.

[0015] Furthermore, the heat exchange module includes a spray pipe, filler and a heat exchange tube bundle arranged in sequence from top to bottom, and the nozzle at the bottom of the spray pipe sprays the spray water downward evenly onto the surface of the filler.

[0016] Furthermore, the heat exchange module includes a spray pipe and fillers and heat exchange tube bundles arranged crosswise along the longitudinal direction.

[0017] After adopting the above technical solution, the present invention has the following advantages compared with the prior art: In the present invention, a plurality of heat exchange modules arranged in a stepped manner are installed in the tower, and the plurality of heat exchange modules are in a V-shaped structure as a whole, and the air inlets are located on the left and right sides of the V-shaped structure. By distributing the plurality of heat exchange modules in a V-shaped structure, it is ensured that the external dry air flowing into the tower can be evenly and fully exchanged with the plurality of heat exchange modules; The present invention has the advantages of large water treatment volume, small floor space, low investment cost, and convenient operation and maintenance, and is particularly suitable for use in large-scale circulating water systems and working conditions with low proximity. The present invention can replace multiple small fans with a large fan, saving more than 10% of fan energy consumption and making maintenance simpler; The water collector in the present invention can collect water from saturated wet air in a centrifugal manner, thereby preventing large water droplets from being directly drawn out through the air duct, and can also reduce the resistance of the fan, thereby further reducing the energy consumption of the fan.

[0018] The present invention is described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of Example 1; Figure 2 is a schematic structural diagram of the heat exchange module in Example 1; Figure 3 is a schematic structural diagram of the water collector in Example 1; Figure 4 It is a schematic diagram of the structure of each water collecting unit of the water collector; Figure 5 is a schematic structural diagram of Example 2; Figure 6 is a schematic structural diagram of the heat exchange module in Example 2; Figure 7 is a schematic structural diagram of Example 3; Figure 8 It is a schematic diagram of the structure of the heat exchange module in Example 3.

[0020] In the figure, 1-fan, 2-spray pipe, 3-heat exchange tube bundle, 4-filler, 5-circulating water pump, 6-water tank, 7-outer guard plate, 8-air inlet, 9-support frame, 10-column, 11-water collector, 111-water collecting unit, 112-hollow cylinder, 113-blade, 114-swirl gap, 115-hexagonal cylinder. DETAILED DESCRIPTION

[0021] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0022] Example 1 like Figure 1 and Figure 2 As shown together, the present invention provides a large-scale cross-flow closed cooling tower, including a square-structured support frame 9, which is installed inside a water pool 6, the bottom of the water pool 6 is located below the ground, and the top open end of the water pool 6 is located above the ground.

[0023] There are symmetrically arranged air inlets 8 on the left and right sides of the support frame 9 , and the rest of the support frame 9 except the air inlets 8 is covered with an outer protective plate 7 .

[0024] A wind tube is installed at the middle position of the top of the supporting frame 9, and a fan 1 is arranged in the wind tube. The fan 1 draws air upward. The fan 1 is supported by a column 10 at its bottom, and the column 10 is fixed to the bottom of the pool 6 in the vertical direction.

[0025] A plurality of heat exchange modules arranged in a stepped manner are installed inside the support frame 9. The plurality of heat exchange modules are in a V-shaped structure as a whole, and the air inlets are located on the left and right sides of the V-shaped structure.

[0026] By distributing multiple heat exchange modules in a V-shaped structure, it is ensured that the external dry air flowing into the tower can evenly and fully exchange heat with the multiple heat exchange modules.

[0027] The heat exchange module includes a spray pipe 2, a heat exchange tube bundle 3 and a filler 4 which are arranged in sequence from top to bottom. A plurality of evenly distributed nozzles are installed at the bottom of the spray pipe 2. The nozzles spray spray water evenly downward onto the surface of the heat exchange tube bundle 3 to form a uniform water film outside the heat exchange tube bundle 3.

[0028] The heat exchange tube bundle 3 is a serpentine structure, and adjacent heat exchange tube bundles 3 are arranged in a staggered manner.

[0029] A plurality of circulating water pumps 5 are installed outside the water pool 6. The circulating water pumps 5 are installed on the ground. The circulating water pumps 5 are arranged one by one with the heat exchange modules. The inlet end of the circulating water pump 5 is connected to the water pool 6. The outlet end of the circulating water pump 5 is connected to the spray pipe 2 through a pipeline. The circulating water pump 5 pressurizes the water in the water pool 6 and lifts it into the spray pipe 2.

[0030] A horizontally arranged water collector 11 is installed between the heat exchange module and the fan 1 . The water collector 11 has a honeycomb structure as a whole and is composed of a plurality of water collecting units 111 spliced ​​together.

[0031] The water collecting unit 111 includes an outer hexagonal tube 115 , a hollow cylinder 112 is arranged inside the hexagonal tube 115 , a plurality of blades 113 evenly distributed are arranged between the hexagonal tube 115 and the hollow cylinder 112 , the blades 113 are arranged obliquely, and a swirl gap 114 is arranged between adjacent blades 113 .

[0032] The saturated wet air can be centrifugally dehumidified by the dehumidifier 11 , which can prevent large water droplets from being directly drawn out through the wind tube and can also reduce the resistance of the fan 1 .

[0033] The specific working principle of the present invention is: The cooled medium enters the heat exchange tube bundle 3, and the nozzle sprays the spray water downward evenly on the surface of the heat exchange tube bundle 3, forming a uniform water film on the outside of the heat exchange tube bundle 3. The water film evaporates and vaporizes continuously, absorbs the heat of the medium in the tube, and cools the medium in the tube. The evaporation of the water film greatly increases the humidity of the air after passing through the heat exchange tube bundle 3 and approaches a saturated state. The fan 1 extracts the saturated wet air. Except for a small amount of vaporized water, most of the spray water falls back to the packing 4; the external dry air flows into the packing 4 horizontally from the air inlet 8, which can evaporate the spray water on the surface of the packing 4, so that the spray water temperature is reduced, and the unevaporated water falls back to the water pool 6 below. The saturated wet air is centrifugally collected by the water collector 11 and then extracted by the top fan 1; the spray water is pressurized by the circulating water pump 5 and recycled.

[0034] Example 2 like Figure 3 and Figure 4 As shown together, the present invention provides a large-scale cross-flow closed cooling tower. The difference between Example 2 and Example 1 is that the heat exchange module structure is different: The heat exchange module in Example 2 includes a spray pipe 2, a filler 4 and a heat exchange tube bundle 3 arranged in sequence from top to bottom. The nozzle at the bottom of the spray pipe 2 sprays the spray water downwardly and evenly onto the surface of the filler 4.

[0035] Example 3 like Figure 5 and Figure 6 As shown together, the present invention provides a large-scale cross-flow closed cooling tower. The difference between Example 3 and Example 1 is that the heat exchange module structure is different: The heat exchange module in Example 3 includes a spray pipe 2 and fillers 4 and a heat exchange tube bundle 3 arranged crosswise along the longitudinal direction.

[0036] The above is an example of the best implementation of the present invention, and the parts not described in detail are common knowledge of ordinary technicians in the field. The protection scope of the present invention shall be based on the content of the claims, and any equivalent transformation based on the technical enlightenment of the present invention is also within the protection scope of the present invention.

Claims

1. A large cross-flow closed cooling tower, characterized in that: It comprises a supporting frame (9) of a square structure, the supporting frame (9) is installed inside the pool (6), and air inlets (8) are symmetrically arranged on the left and right sides of the supporting frame (9); A plurality of heat exchange modules arranged in a stepped manner are installed inside the support frame (9), the plurality of heat exchange modules are in a V-shaped structure as a whole, and the air inlets are located on the left and right sides of the V-shaped structure; A wind tube is installed at the middle position of the top of the supporting frame (9), and a fan (1) is arranged in the wind tube, and the fan (1) draws air upwards; A horizontally arranged water collector (11) is installed between the heat exchange module and the fan (1); the water collector (11) is in an overall honeycomb structure and is formed by a plurality of water collecting units (111) spliced ​​together.

2. A large-scale cross-flow closed cooling tower as claimed in claim 1, characterized in that: The bottom of the pool (6) is located below the ground, and the top open end of the pool (6) is located above the ground.

3. A large-scale cross-flow closed cooling tower as claimed in claim 2, characterized in that: A plurality of circulating water pumps (5) are installed outside the water pool (6). The circulating water pumps (5) are installed on the ground. The circulating water pumps (5) are arranged in a one-to-one correspondence with the heat exchange modules. The inlet end of the circulating water pump (5) is connected to the water pool (6), and the outlet end of the circulating water pump (5) is connected to the spray pipe (2) through a pipeline.

4. A large-scale cross-flow closed cooling tower as claimed in claim 1, characterized in that: The supporting frame (9) is covered with an outer protective plate (7) at all positions except the air inlet (8).

5. A large-scale cross-flow closed cooling tower as claimed in claim 1, characterized in that: The fan (1) is supported by a column (10) at the bottom thereof, and the column (10) is fixedly connected to the bottom of the pool (6) in a vertical direction.

6. A large-scale cross-flow closed cooling tower as claimed in claim 1, characterized in that: The water collecting unit (111) comprises an external hexagonal cylinder (115), a hollow cylinder (112) is provided inside the hexagonal cylinder (115), a plurality of blades (113) evenly distributed are provided between the hexagonal cylinder (115) and the hollow cylinder (112), the blades (113) are arranged in an inclined manner, and a swirl gap (114) is provided between adjacent blades (113).

7. A large-scale cross-flow closed cooling tower as claimed in claim 1, characterized in that: The heat exchange module comprises a spray pipe (2), a heat exchange tube bundle (3) and a filler (4) which are arranged in sequence from top to bottom, and a plurality of uniformly distributed nozzles are installed at the bottom of the spray pipe (2).

8. A large-scale cross-flow closed cooling tower as claimed in claim 7, characterized in that: The heat exchange tube bundle (3) is a serpentine structure, and adjacent heat exchange tube bundles (3) are arranged in a staggered manner.

9. A large-scale cross-flow closed cooling tower as claimed in claim 1, characterized in that: The heat exchange module comprises a spray pipe (2), a filler (4) and a heat exchange tube bundle (3) which are arranged in sequence from top to bottom, and a nozzle at the bottom of the spray pipe (2) sprays spray water downwardly and evenly onto the surface of the filler (4).

10. A large-scale cross-flow closed cooling tower as claimed in claim 1, characterized in that: The heat exchange module comprises a spray pipe (2) and fillers (4) and a heat exchange tube bundle (3) arranged crosswise in the longitudinal direction.

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