CN109708488B - Novel wet cooling tower with optimized air inlet by coordination of inside and outside - Google Patents
Novel wet cooling tower with optimized air inlet by coordination of inside and outside Download PDFInfo
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- CN109708488B CN109708488B CN201910015918.6A CN201910015918A CN109708488B CN 109708488 B CN109708488 B CN 109708488B CN 201910015918 A CN201910015918 A CN 201910015918A CN 109708488 B CN109708488 B CN 109708488B
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Abstract
The invention discloses a rain area dry-wet mixed cooling system with cooperative inside and outside of a natural ventilation wet cooling tower, which comprises the natural ventilation wet cooling tower, wherein a plurality of splitter plates are arranged in a rain area of the natural ventilation wet cooling tower, the splitter plates are of plate-shaped structures, one ends of the splitter plates are connected to a tower wall of the natural ventilation wet cooling tower, the other ends of the splitter plates point to the adjacent splitter plates, two sides of each splitter plate are obliquely arranged, one side of each splitter plate close to the cooling tower wall is lower than the other side of the splitter plate, all the splitter plates are in rotational symmetry relative to the radial section center of the ultra-large wet cooling tower, the rain area part covered by one splitter plate forms a dry area, an air inlet at the bottom of the natural ventilation wet cooling tower is divided into a plurality of dry area inlets and a plurality of rain area inlets by a plurality of dry areas, two sides of the ground of each dry area inlet are, and the air deflectors are arranged on the outer side of the tower wall.
Description
Technical Field
The invention relates to the field of energy and power engineering, in particular to a novel natural ventilation wet cooling tower with optimized air inlet by internal and external coordination.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The interior region of a conventional wet cooling tower is generally divided into a water distribution region, a packing region, and a rain region. The rain area has high water spraying density, the ventilation resistance of the cooling tower is increased, and outside cold air is difficult to enter the position of the tower center, so that the uniformity of a flow field in the tower is reduced, the ventilation quantity of the cooling tower is reduced, and the heat and mass transfer performance of the rain area is reduced. The deterioration of the ventilation performance of the rain zone directly affects the ventilation characteristic of the packing zone, and further affects the heat and mass transfer performance of the packing zone and the water distribution zone, thereby deteriorating the overall thermal performance of the whole tower.
The inventor of the invention finds that cross wind generally exists in the operation process of the cooling tower, the circumferential wind inlet uniformity of the cooling tower is seriously influenced, the wind inlet resistance is increased, and the ventilation quantity of the cooling tower is reduced.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide a rain area dry-wet mixed cooling system with cooperation between the inside and the outside of a natural ventilation wet cooling tower, and a dry-wet mixed cooling mode with an air inlet channel integrated from outside to inside is formed, so that the ventilation resistance of the rain area is reduced, the ventilation quantity of the central area of the cooling tower is enhanced, an air flow field in the cooling tower is reconstructed, the uniformity of an air-water flow field in the tower is enhanced, the heat and mass transfer performances of a rain area and a filler area are enhanced, and the cooling efficiency of the ultra-large wet cooling tower is improved.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a rain area dry-wet mixed cooling system with cooperation of the inside and the outside of a natural ventilation wet cooling tower comprises the natural ventilation wet cooling tower, the rain area of the natural ventilation wet cooling tower is internally provided with a plurality of splitter plates, the splitter plates are of plate-shaped structures, one ends of the splitter plates are connected to the tower wall of the natural ventilation wet cooling tower, the other ends of the splitter plates point to the adjacent splitter plates, two sides of each splitter plate are obliquely arranged, one side of each splitter plate close to the cooling tower wall is lower than the other side of each splitter plate, all the splitter plates are rotationally symmetrical about the center of the radial cross section of the ultra-large wet cooling tower, the rain area part covered by one splitter plate forms a dry area, an air inlet at the bottom of the natural ventilation wet cooling tower is divided into a plurality of dry area inlets and a plurality of rain area inlets by a plurality of dry areas, air deflectors are vertically arranged on two sides of the ground of each dry area inlet, and the air deflectors are arranged on the outer side.
According to the dry-wet mixed cooling system, the wet cooling tower is divided into a dry area and a wet area by additionally arranging the flow distribution plate in the rain area, so that a dry-wet mixed cooling mode is formed, the ventilation resistance of the rain area is reduced, the ventilation quantity of a tower center is increased, the uniformity of an air-water field in the tower is enhanced, the heat exchange of the rain area and a filler area is enhanced, and the cooling efficiency of the cooling tower is further improved. Secondly, the air deflector is additionally arranged and is matched with the arrangement direction of the splitter plate, so that outside cold air is easier to enter the inner area of the cooling tower under the condition of ambient crosswind, the adverse effect of the outside crosswind on the thermal performance of the cooling tower is weakened, meanwhile, the kinetic energy of the outside crosswind is fully utilized, the crosswind is sent into a dry-wet mixed rain area, the aerodynamic field of the rain area is homogenized, and the heat and mass transfer performance of the whole tower is enhanced.
The invention further provides an application of the cooling system in a large thermal power station or a nuclear power station.
The invention provides a natural ventilation wet cooling method, which comprises the steps that side cold air in the environment enters a dry area formed at the lower part of a splitter plate under the action of a cooling tower air deflector, and the side cold air entering the dry area enters the tower from one end of the splitter plate and the high side of the splitter plate respectively under the action of the obliquely arranged splitter plate and exchanges heat with water drops in the tower.
The invention has the beneficial effects that:
according to the rain area dry-wet mixed cooling system with the cooling tower internally and externally integrated reconstruction, the wet cooling tower is divided into a dry area and a wet area by additionally arranging the splitter plate on the rain area, and the air deflector is arranged at the outer side of the air inlet of the dry area, so that a dry-wet mixed cooling mode with an air inlet channel from outside to inside is formed, the ventilation resistance of the rain area is reduced under the condition of crosswind, the uniformity of an air-water field in the tower is enhanced, the heat exchange of the rain area and a filler area is enhanced, and the cooling efficiency of the cooling tower is further improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
FIG. 1 is a schematic structural view of a hybrid cooling tower with air deflectors;
FIG. 2 is a view of the construction of the manifold;
FIG. 3 is a schematic view of the installation of the splitter plate and the air deflector;
the device comprises a flow distribution plate 1, a flow guide plate 2, an air guide plate 3, a tower wall 4, a herringbone column 5, a water collection groove 6, a water falling hole 7 and a baffle plate.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. 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 disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In view of the not enough that crosswind generally exists the influence cooling tower air volume in the cooling tower operation process, in order to solve above technical problem, this disclosure has provided the inside and outside rain district of natural draft wet cooling tower in coordination dry and wet mixed cooling system.
The typical embodiment of the present disclosure provides a rain zone dry-wet mixed cooling system with cooperation between the inside and the outside of a natural draft wet cooling tower, which comprises a natural draft wet cooling tower, wherein a plurality of splitter plates are arranged in a rain zone of the natural draft wet cooling tower, the splitter plates are in plate-shaped structures, one ends of the splitter plates are connected to a tower wall of the natural draft wet cooling tower, the other ends of the splitter plates point to the adjacent splitter plates, two sides of each splitter plate are obliquely arranged, one side of each splitter plate close to the cooling tower wall is lower than the other side of each splitter plate, all the splitter plates are rotationally symmetric with respect to the radial cross section center of the ultra-large wet cooling tower, a rain zone part covered by one splitter plate forms a dry zone, an air inlet at the bottom of the natural draft wet cooling tower is divided into a plurality of dry zone inlets and a plurality of rain zone inlets by a plurality of dry zone inlets, two sides of the ground of each dry, and the air deflectors are arranged on the outer side of the tower wall.
According to the dry-wet mixed cooling system, the splitter plate is additionally arranged in the rain area, the wet cooling tower is divided into a dry area and a wet area, a dry-wet mixed cooling mode is formed, the ventilation resistance of the rain area is reduced, the ventilation quantity of the tower center is increased, the uniformity of an air-water field in the tower is enhanced, the heat exchange of the rain area and the filler area is enhanced, and the cooling efficiency of the cooling tower is further improved. Secondly, install the aviation baffle additional, with the flow distribution plate setting mode to the cooperation for under the environment crosswind, outside cold air is changeed and is got into cooling tower inner region, thereby has weakened the adverse effect of outside crosswind to cooling tower thermal performance on the one hand, simultaneously make full use of outside crosswind kinetic energy, send the crosswind into wet and dry mixed rain area, has evenly evened the aerodynamic field in rain area, has strengthened the heat and mass transfer performance of whole tower.
According to the air guide plate and the flow distribution plate, a small amount of air guide plates can be adopted to provide the air quantity of the cross air entering the cooling tower.
In one or more embodiments of the present invention, the lower side of the splitter plate is provided with a water receiving groove, and the top edge of one groove wall of the water receiving groove is connected to the lower side of the splitter plate. The water drops after being divided can be redistributed.
In the series of embodiments, the two axial ends of the water collecting groove are of closed structures, and the bottom of the water collecting groove is provided with a through hole as a water falling hole. Can guarantee that the rain zone drenching is more even, increase the cooling effect.
The closed structure is a baffle plate, and the height of the baffle plate is the same as that of the side wall of the water collecting tank.
In the series of embodiments, the top edges of the two side walls of the water receiving groove form a plane which is parallel to the radial section of the cooling tower. The water collecting tank can collect more water drops, and the utilization rate of the water collecting tank is increased.
In one or more embodiments of this embodiment, a water distribution region is disposed above the packing region. The rainwater is conveniently distributed.
In one or more embodiments of the embodiment, the included angle between the splitter plate and the radial section of the large wet cooling tower is 10-20 degrees, the included angle between the splitter plate and the radial section of the large wet cooling tower is called as the installation included angle of the splitter plate and is recorded as α, the smaller the installation included angle is, the larger the formed dry area is, the larger the amount of cold air entering the tower center position is, and the better the cooling effect of the installation included angle is.
In one or more embodiments of the present disclosure, the ratio of the distance from one end of the diverter plate to the other end of the diverter plate to the tower inner radius in the packing region is from 1/3 to 3/4. The cold air and the water drops at the position of the tower center can be better ensured to exchange heat. The ratio of the distance from one end of the splitter plate to the other end of the splitter plate to the inner radius of the packed zone tower is called the radius ratio and is recorded as gamma, the distance from one end of the splitter plate to the other end of the splitter plate is called the width and is recorded as w, and the distance between two sides of the splitter plate is called the length and is recorded as l.
The height between the low side of the splitter plate and the ground is called installation height, the number of the splitter plates is recorded as n, α, h, gamma, w and the specific value of n, and the height is determined according to the geographical position of the location of the cooling tower, meteorological conditions, operation conditions of the cooling tower and the like.
An air inlet at the bottom of the cooling tower is formed by building a herringbone column.
In another embodiment of the disclosure, an application of the cooling system in a large thermal power station or a nuclear power station is provided.
According to the third embodiment of the disclosure, a natural draft wet cooling method is provided, and the cooling system is provided, wherein side cold air in the environment enters a dry area formed at the lower part of the splitter plate under the action of the air deflector of the cooling tower, and the side cold air entering the dry area enters the tower from one end of the splitter plate and the high side of the splitter plate respectively under the action of the obliquely arranged splitter plate, and exchanges heat with water drops in the tower.
In one or more embodiments of this embodiment, the collected water droplets are collected after being guided by the flow distribution plate in the rain area, and then the collected water droplets are sprinkled.
In order to make the technical solutions of the present disclosure more clearly understood by those skilled in the art, the technical solutions of the present disclosure will be described in detail below with reference to specific embodiments.
Inside and outside collaborative rain district dry-wet mixed cooling system of natural draft wet cooling tower, as shown in fig. 1, including natural draft wet cooling tower, the inside main area of cooling tower is the rain district, the filler district, join in marriage the water district, be equipped with 4 flow distribution plates 1 in the rain district of natural draft wet cooling tower, flow distribution plate 1 is platelike structure, the one end of flow distribution plate 1 is connected on the tower wall of natural draft wet cooling tower, the directional adjacent flow distribution plate 1 of the other end of flow distribution plate 1, the both sides slope of every flow distribution plate 1 sets up, one side of the flow distribution plate that is close to cooling tower wall 3 is less than the opposite side of flow distribution plate, all flow distribution plates 1 are rotational symmetry about the radial cross-section center of super large-scale wet cooling tower. Circulating water sprays to the filler district through the water distribution district, partly gets into the rain district and descends to the catch basin after the filler district through abundant heat transfer, and another part is collected by flow distribution plate 1. Thus, a dry area and a wet area are formed in the rain area, and a dry-wet mixed cooling system can be realized.
As shown in fig. 2, the flow distribution plate 1 is provided with a water receiving groove 5 on one side of the flow distribution plate 1. Wherein, the two ends of the water collecting tank 5 are provided with baffle plates 7 to prevent the collected circulating water from flowing out; the bottom of the water receiving tank 5 is provided with a water falling hole 6 so as to discharge the circulating water collected in the water receiving tank 5 for utilization. After the splitter plate is obliquely arranged, the water receiving groove is positioned at the lower side of the splitter plate.
The length between two sides of the splitter plate is l, wherein α is 15 degrees, h is 8.5m, gamma is 2/3, w is 47.4m, and n is 4.
The rain area where the flow distribution plate 1 is installed is divided into a dry area and a wet area, as shown in fig. 1. Wherein, the area without the raindrops below the splitter plate 1 is a dry area, and the part without the raindrops covered by the splitter plate is a wet area. The dry area part of the rain area has no water drop resistance, so that outside cold air can enter the tower center more easily, and the uniformity of a flow field is improved.
In order to reduce the adverse effect of the ambient side air on the air intake of the cooling tower, further increase the ventilation quantity of the dry area of the rain area and control the distribution of an air flow field in the dry area, an air deflector 2 is arranged at the air intake outside the dry area. The air deflector 2 is matched with the flow distribution plate 1 to form an integrated air inlet channel from outside to inside in a rain area of the cooling tower. Fig. 3 is a schematic diagram of the matching of the air deflector 2 and the splitter plate 1 and the air intake. Outside cold air passes through the dry area and then diffuses into the tower to the depth and the periphery, so that ventilation in the rain area is enhanced.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (8)
1. A rain area dry-wet mixed cooling system with cooperative inside and outside of a natural ventilation wet cooling tower is characterized by comprising the natural ventilation wet cooling tower, a plurality of splitter plates are arranged in a rain area of the natural ventilation wet cooling tower, the splitter plates are of plate-shaped structures, one ends of the splitter plates are connected to a tower wall of the natural ventilation wet cooling tower, the other ends of the splitter plates point to the adjacent splitter plates, two sides of each splitter plate are obliquely arranged, one side of each splitter plate close to the cooling tower wall is lower than the other side of the corresponding splitter plate, all the splitter plates are in rotational symmetry relative to the center of the radial cross section of the ultra-large wet cooling tower, a rain area part covered by one splitter plate forms a dry area, an air inlet at the bottom of the natural ventilation wet cooling tower is divided into a plurality of dry area inlets and a plurality of rain area inlets by a plurality of dry areas, and wind guide plates are vertically arranged on, and the air deflectors are all arranged on the outer side of the tower wall;
a water collecting groove is arranged at the lower side of the flow distribution plate, and the top edge of one groove wall of the water collecting groove is connected with the lower side of the flow distribution plate;
the water collecting tank is characterized in that two axial ends of the water collecting tank are of closed structures, each closed structure is a baffle, the height of each baffle is the same as that of the side wall of the water collecting tank, and a through hole is arranged at the bottom of the water collecting tank and serves as a water falling hole.
2. The cooling system of claim 1, wherein the top edges of the two side walls of the water receiving tank form a plane parallel to the radial cross section of the cooling tower.
3. The cooling system of claim 1, wherein a water distribution region is provided above the packing region.
4. The cooling system of claim 1, wherein the angle between the splitter plate and the radial cross-section of the large wet cooling tower is 10-20 °.
5. The cooling system of claim 1, wherein the ratio of the distance from one end of the flow distribution plate to the other end of the flow distribution plate to the tower inner radius of the packed bed is 1/3 to 3/4.
6. Use of a cooling system according to any one of claims 1 to 5 in a large thermal power plant or nuclear power plant.
7. A natural draft wet cooling method, characterized in that, the cooling system of any claim 1 to 5 is provided, side cold wind in the environment enters a dry area formed at the lower part of a splitter plate under the action of a wind deflector of a cooling tower, and the side cold wind entering the dry area enters the tower from one end of the splitter plate and the high side of the splitter plate respectively under the action of the obliquely arranged splitter plate, and exchanges heat with water drops in the tower.
8. The cooling method as claimed in claim 7, wherein the water droplets guided by the flow distribution plate in the rain area are collected, and the collected water droplets are sprayed.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910015918.6A CN109708488B (en) | 2019-01-08 | 2019-01-08 | Novel wet cooling tower with optimized air inlet by coordination of inside and outside |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910015918.6A CN109708488B (en) | 2019-01-08 | 2019-01-08 | Novel wet cooling tower with optimized air inlet by coordination of inside and outside |
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| CN109708488B true CN109708488B (en) | 2020-06-30 |
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| CN112944943A (en) * | 2021-02-01 | 2021-06-11 | 山东大学 | Active extra-large-scale dry and wet rain area cooling tower of adjusting dry area coverage area |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1003188B (en) * | 1985-06-14 | 1989-02-01 | Gea空冷设备哈佩尔有限公司 | Flow deflecting device for spray cooling tower |
| CN201302422Y (en) * | 2008-11-27 | 2009-09-02 | 华北电力大学（保定） | Even air intake guiding device for natural ventilation cooling tower |
| CN202204336U (en) * | 2011-07-28 | 2012-04-25 | 湖南省电力勘测设计院 | Assistant ventilating reverse flow wet type cooling tower |
| CN203216311U (en) * | 2013-04-17 | 2013-09-25 | 江苏海鸥冷却塔股份有限公司 | Water collection device for naturally-ventilated reverse flow cooling tower |
| CN203605794U (en) * | 2013-10-17 | 2014-05-21 | 济南达能动力技术有限责任公司 | Cooling tower with air deflectors |
| CN105674764A (en) * | 2016-04-05 | 2016-06-15 | 哈尔滨宇神科技有限公司 | Inner and outer air flow guiding device for cooling tower and flow guiding method |
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