CN111879147A

CN111879147A - Reverse water distribution industrial cooling tower

Info

Publication number: CN111879147A
Application number: CN202010778055.0A
Authority: CN
Inventors: 高晋柏; 戴正刚; 陈慧
Original assignee: Anhui Zhenggang New Energy Technology Co ltd; Song Pin
Current assignee: Anhui Zhenggang New Energy Technology Co ltd; Song Pin
Priority date: 2020-08-05
Filing date: 2020-08-05
Publication date: 2020-11-03

Abstract

The invention discloses a reverse water distribution industrial cooling tower, which comprises: the cooling tower comprises a cooling tower body, wherein a filler area is arranged at the bottom end of the cooling tower body, and a reservoir is arranged at the bottom of the filler area; the central shaft, the central shaft sets up the inside intermediate position of cooling tower body, the upper end of central shaft is provided with main basin, main basin is the cross, wherein, main basin includes the basin, sets up the lower basin of basin bottom portion, the both sides outer wall intercommunication water distribution pipe of lower main basin, the bottom of water distribution pipe is provided with the splash device, the splash device is located the top in filler district, and the splash device covers the whole in filler district, reverse water distribution cooling tower is with water distribution direction outside-in, no matter the water yield size, can not cause the cooling tower periphery trickle density little and the anhydrous condition appears even.

Description

Reverse water distribution industrial cooling tower

The technical field is as follows:

the invention relates to the field of large-scale industrial cooling towers, in particular to a reverse water distribution industrial cooling tower.

Background art:

in the operation process of the natural ventilation cooling tower, circulating cooling water (hot water) passes through the vertical shaft and the water distribution pipe groove, is sprayed out through the nozzle, and is sprayed and falls on the surface of the water spraying filler in a water mist mode. In the packing area, cooling water flows through the surface of the packing in the form of a film and performs heat and mass transfer with air. Below the filler area, the cooling water is gathered into liquid drops and falls down in the form of raindrops, and the liquid drops contact with cold air to exchange heat in the falling process and finally fall into a water collecting tank.

The cooling tower shaft is a vertical shaft, the bottom of the cooling tower shaft is connected with a circulating water pressure pipe, the top of the cooling tower shaft is open, and hot water is delivered to a water distribution elevation through the shaft. Water is distributed to the water distribution tank and the water distribution pipes through the main water tank, and then the water is sprinkled on the filler through the spray heads arranged at the bottoms of the water pipes. The quality of water distribution performance directly influences the air distribution and the cooling function of the filler. Unreasonable water distribution can greatly reduce the cooling effect.

The cooling effect of the cooling tower is closely related to the water distribution system. The large-scale and ultra-large-scale natural ventilation cooling towers have large section radius, so that the loss of a pipeline water head in the water distribution process cannot be ignored, and the difference of water spraying density at different positions on the sections is large. And the cooling capacity of the outer periphery area of the tower body of the cooling tower is stronger than that of the central area of the tower.

The central shaft cooling tower has wide application all over the world, and in the cooling tower with large water spraying area, the main water tank is very long, the elevation change along the water surface of the water tank is large when the flow is constant, and the far end of the water tank may have no water when the flow is small.

The trough type water distribution is still the main water distribution mode of large natural ventilation counter-flow wet cooling towers of power stations at home and abroad at present. The hot water from the condenser flows into the main water tank through a vertical shaft with a rectangular or circular cross section. Then, the filler flows through a water distribution tank and a water distribution pipe in sequence, and finally, the filler is sprayed to the filler through a spray head arranged on the water distribution pipe.

The presence or absence and the size of the water flow represent the distribution of the wind resistance in the tower, the air flow rarely passes through the area with high water spraying density, and the air is short-circuited in the dry area (water-free area). The place with water is lack of air, and the place with air is free of water. The water vapor can not fully exchange heat, the heat exchange efficiency is low, and the cooling capacity of the tower is reduced.

In the heat exchange area of the cooling tower, the outer zone air flow rate is relatively high. The inner zone air flow rate is lower. The temperature of the filling area is distributed in a low-outside and high-inside mode.

According to the distribution conditions of the temperature fields of the outer zone and the inner zone, the water spraying density is increased from inside to outside reasonably and gradually, so that the air quantity is matched with the water quantity, and the cooling capacity of the cooling tower can be improved. The reverse water distribution and the U-shaped main water tank structure are adopted, so that the aim can be fulfilled.

In the existing cooling tower, the temperature of air gradually increases from outside to inside along the radial direction, and the speed gradually decreases. The air temperature at the central area of the tower is high, the humidity is high, and the speed is low. Therefore, the water spray density should be increased in the region where the cooling capacity is high, and the water spray density should be decreased in the region where the cooling capacity is low.

The existing water distribution of the cooling tower, whether groove type water distribution or pipe type water distribution, the total flow direction of hot water after entering the cooling tower is from inside to outside, namely the hot water flows to the water distribution area around the vertical shaft after reaching the water distribution elevation in the vertical shaft. The water distribution direction from inside to outside is adopted, because the vertical shaft is arranged in the center inside the cooling tower, the influence on the ventilation resistance of the air inlet of the cooling tower is small, and the aim of water distribution can be conveniently achieved through the water distribution tank or the water distribution pipe. In this distribution system arrangement, the hot water flows from the central shaft in the cooling tower to the surrounding distribution areas, so that the total flow is from the inside to the outside.

The temperature of the water does not change much along the water distribution tank or the water distribution pipe. If the water temperature is considered only, the flow direction of the water is not different from the inside to the outside and from the outside to the inside.

Hot water is at the inside-out flow in-process, and every process one spatters the device, and total water yield constantly reduces, because along the influence of on-way resistance and local resistance, the import pressure head that spatters the device reduces from inside to outside gradually, and the device water yield that spatters of same model reduces gradually, and it is big to cause inner district trickle density, and outer district trickle density is little. Even when the water amount is small, the water distribution tank or the far end of the water distribution pipe is free from water, and the short circuit is formed in the peripheral area of the cooling tower by airflow, so that the cooling performance of the cooling tower is greatly reduced.

Actual measurement and numerical simulation prove that in the water distribution mode from inside to outside (the existing mode), the air flow rate is gradually reduced from outside to inside along the radius direction of the cooling tower. In order to match water distribution with the aerodynamic field of the cooling tower, keep the gas-water ratio of each part in the cooling tower basically consistent and improve the cooling performance of the cooling tower, the water spraying density of the cooling tower is gradually increased from inside to outside along the radial direction. The existing hot water flows from inside to outside, so that water distribution cannot be well matched with an aerodynamic field of a cooling tower. This is one of the main reasons why the cooling towers of the present large-scale industry are not efficient.

The invention content is as follows:

the invention mainly solves the technical problems that: the water distribution direction is reconstructed, the defect of water distribution from inside to outside of the existing large-scale industrial cooling tower is thoroughly overcome, the thermal performance of the cooling tower is improved, and the persistent symptom of freezing of the cooling tower in winter is solved.

The technical problem to be solved by the invention is realized by adopting the following technical scheme: a reverse water distribution industrial cooling tower comprising:

the cooling tower comprises a cooling tower body, wherein a filler area is arranged at the bottom end of the cooling tower body, and a reservoir is arranged at the bottom of the filler area;

the central shaft, the central shaft sets up the inside intermediate position of cooling tower body, the upper end of central shaft is provided with main basin, main basin is the cross, wherein, main basin includes the basin, sets up the lower basin of basin bottom portion, the both sides outer wall intercommunication water distribution pipe of lower main basin, the bottom of water distribution pipe is provided with the splash device, the splash device is located the top in filler district, and the splash device covers the whole in filler district.

Furthermore, the water drainage groove is intersected with the central vertical shaft at the center of the cross shape, and the water drainage groove is not communicated with the central vertical shaft.

Further, the upper water tank intersects with the central shaft at the center of the cross shape, and the upper water tank is communicated with the central shaft.

Furthermore, the outer ends of the upper water tank and the lower water tank are provided with communicating pipes, and two ends of each communicating pipe are respectively communicated with the upper water tank and the lower water tank.

Further, the bottom of cistern passes through the pipe connection water pump, the water pump pipe connection condenser, the condenser pass through the pipeline with central shaft is connected.

Compared with the prior art, the invention has the following technical effects:

the reverse water distribution cooling tower enables the water distribution direction to be from outside to inside, and the conditions of low water spraying density and even no water can not be caused at the periphery of the cooling tower no matter the water quantity, so that the improvement of the thermal performance of the cooling tower is facilitated on one hand, and the freezing prevention of the cooling tower in winter is facilitated on the other hand.

Due to the resistance effect of the pipeline, the water yield of the splashing device is gradually reduced from outside to inside, so that the water yield is high in places with high air quantity. And the water quantity is small in places with small air quantity. The air quantity is matched with the water quantity. The cooling capacity of the cooling tower is greatly improved.

The invention makes full use of the structural characteristics of the cooling tower and solves the problem of poor air-water matching of the existing large-scale industrial cooling tower. Meanwhile, the persistent ailment that the cooling tower freezes in winter is also solved. At present, the large natural ventilation high-level water collecting cooling tower gradually popularized is difficult to implement due to structural limitation when a hot water anti-freezing pipe is additionally arranged. The application of the invention thoroughly solves the problem of freezing prevention in winter of the large-scale natural ventilation high-level water-collecting cooling tower, and can greatly improve the thermal performance and the operation safety and economy of the existing cooling tower.

Description of the drawings:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of the present invention;

FIG. 3 is a schematic structural view of the present invention;

number in the figure: 10. cooling the tower body; 11. a filler zone; 12. a reservoir; 13. a water pump; 14. a condenser; 20. a central shaft; 30. a main water tank; 31. a water feeding groove; 32. a water discharging tank; 33. a communicating pipe; 40. a water distribution pipe; 41. a splashing device.

The specific implementation mode is as follows:

in order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further clarified by combining the specific drawings.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Examples

As shown in fig. 1, 2 and 3, the present invention provides a reverse water distribution industrial cooling tower, comprising:

the cooling tower comprises a cooling tower body 10, wherein a filler area 11 is arranged at the bottom end of the cooling tower body 10, and a reservoir 12 is arranged at the bottom of the filler area 11;

the central shaft 20, the central shaft 20 sets up the inside intermediate position of cooling tower 10, the upper end of central shaft 20 is provided with main basin 30, main basin 30 is the cross, wherein, main basin 30 includes water feeding tank 31, sets up lower basin 32 of water feeding tank 31 bottom, the both sides outer wall intercommunication water distribution pipe 40 of lower basin 32, the bottom of water distribution pipe 40 is provided with splash device 41, splash device 41 is located the top in filler district 11, and splash device 41 covers the whole of filler district 11.

The drainage groove 32 intersects the central shaft 20 at the center of the cross shape, and the drainage groove 32 is not communicated with the central shaft 20.

The upper water tank 31 intersects the central shaft 20 at the center of the cross shape, and the upper water tank 31 communicates with the central shaft 20.

The outer ends of the upper water tank 31 and the lower water tank 32 are provided with a communicating pipe 33, and two ends of the communicating pipe 33 are respectively communicated with the upper water tank 31 and the lower water tank 32.

The bottom of the reservoir 12 is connected with a water pump 13 through a pipeline, the water pump 13 is connected with a condenser 14 through a pipeline, and the condenser 14 is connected with the central shaft 20 through a pipeline.

In specific implementation, the water discharge groove 1/2 is provided with a gate plate, so that the water discharge groove can be conveniently operated in 2 sections in winter, the inner section is anhydrous, and the outer section is watered, so that even if 50% of water is produced in winter, the 1/2 area outside the cooling tower can be sufficiently heated to operate and prevent freezing.

The foregoing shows and describes the general principles, essential features, and inventive features of this invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A reverse water distribution industrial cooling tower, comprising:

the central shaft, the central shaft sets up the inside intermediate position of cooling tower body, the upper end of central shaft is provided with main basin, main basin is the cross, wherein, main basin includes the basin, sets up the lower basin of basin bottom portion, the both sides outer wall intercommunication distributing pipe of lower basin, the bottom of distributing pipe is provided with the splash device, the splash device is located the top in filler district, and the splash device covers the whole in filler district.

2. The industrial cooling tower of claim 1, wherein the flume intersects the central shaft at a cross-shaped center and the flume is not in communication with the central shaft.

3. A reverse water distribution industrial cooling tower according to claim 1, wherein said water supply tank intersects said central shaft at the center of the cross shape and said water supply tank communicates with said central shaft.

4. The industrial cooling tower of reverse water distribution according to claim 1, wherein the outer ends of the upper and lower water tanks are provided with a communicating pipe, and both ends of the communicating pipe are respectively communicated with the upper and lower water tanks.

5. Industrial cooling tower with reverse water distribution according to claim 1, characterized in that the bottom of said reservoir is connected by means of a pipe to a water pump, said water pump being connected by means of a pipe to a condenser, said condenser being connected by means of a pipe to said central shaft.