CN107796238B - Air distribution structure of bottom blowing type cooling tower - Google Patents

Air distribution structure of bottom blowing type cooling tower Download PDF

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Publication number
CN107796238B
CN107796238B CN201711233292.3A CN201711233292A CN107796238B CN 107796238 B CN107796238 B CN 107796238B CN 201711233292 A CN201711233292 A CN 201711233292A CN 107796238 B CN107796238 B CN 107796238B
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air distribution
distribution plate
cooling tower
plate
water
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CN107796238A (en
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胡光忠
赵云
纪博凯
邓聪
屈督清
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Sichuan University of Science and Engineering
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Sichuan University of Science and Engineering
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28CHEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
    • F28C1/00Direct-contact trickle coolers, e.g. cooling towers
    • F28C1/10Arrangements for suppressing noise
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F25/00Component parts of trickle coolers
    • F28F25/10Component parts of trickle coolers for feeding gas or vapour
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention discloses a bottom blast cooling tower air distribution structure, which comprises an air distribution structure arranged between a packing layer of a cooling tower and an air blower, wherein the air distribution structure comprises an upper air distribution plate, a lower air distribution plate and a connecting plate, the upper ends of the upper air distribution plate and the lower air distribution plate are alternately arranged along the circumferential direction of the connecting plate at equal intervals, the lower ends of the upper air distribution plate and the lower air distribution plate are connected to an air duct on the circumferential side of the air blower, the lower ends of the upper air distribution plate and the lower air distribution plate are obliquely arranged towards the side wall of the cooling tower, a certain gap is reserved between the upper air distribution plate and the lower air distribution plate, so that circulating water can flow into a water collecting tank at the bottom of the cooling tower along the obliquely arranged upper air distribution plate and the lower air distribution plate, the circulating water is prevented from falling into water, the water spraying noise is reduced, and meanwhile, cold air blown out by the air blower directly cools the circulating water passing through the packing layer through the gap, and the heat transfer efficiency of the cooling tower is improved.

Description

Air distribution structure of bottom blowing type cooling tower
Technical Field
The invention relates to the technical field of cooling towers, in particular to a cooling tower air distribution structure.
Background
The cooling tower (The cooling tower) is a device for absorbing heat from a system and discharging the heat to the atmosphere by using water as a circulating coolant so as to reduce the water temperature; the cooling is an evaporation heat-dissipating device which utilizes the principles of evaporation heat dissipation, convection heat transfer, radiation heat transfer and the like of heat taken away by evaporation heat generated by the contact of water and air flow and then carries out cold-heat exchange to generate steam, so as to dissipate waste heat generated in industry or refrigeration air conditioner and reduce water temperature, thereby ensuring the normal operation of the system, and the device is generally barrel-shaped, and is named as a cooling tower.
At present, the mechanical ventilation type cooling tower is widely applied to various fields such as large markets, hotels, gas stations and the like, but the cooling tower can generate great noise in the working process, and the noise pollution sound source intensity of the cooling tower can generally reach more than 80dB (A) or even more, thereby influencing the normal life of surrounding staff and residents. Along with the gradual progress of society and the continuous development of science, the requirements of people on living environments and working environments are also continuously improved, and the harm of noise to people is also slowly recognized by people. Therefore, some researchers working in industries related to cooling towers begin to research how to realize noise reduction of cooling towers, especially how to ensure the noise reduction effect of cooling towers without affecting the heat transfer performance of cooling towers, and the problem of noise control of cooling towers is always a problem which needs to be solved urgently in the cooling tower industry.
In some special cases, the installation height for the cooling tower is also limited. Based on some of the above requirements, a closed bottom blast cooling tower structure is proposed. The structure can solve the problems and reach the standard of environmental protection noise. But at the same time, some research and development problems also appear, this closed bottom blast cooling tower sets up the transmission parts such as fan, motor to the bottom of cooling tower, adopt the bottom blast mode, make external cold air enter into the tower in, the circulating water in the filler layer is to flow down from the top, external cold air gets into the circulating water in the filler layer in the tower and cools down, the amount of wind that must guarantee to blow in simultaneously can not too big, too big can cause tiny water droplet to blow out by the wind from the top of the tower, too little can not cool down (reach the design requirement) to circulating water, still need guarantee that the circulating water that flows down from the filler layer can not flow to subaerial from fan, motor, can only get back to in the catch basin at the bottom of the tower.
The noise of the bottom blast cooling tower mainly comprises water spraying noise, fan noise, mechanical noise and tower body noise, and the steady-state noise generated by the impact of water drops continuously falling in a large area on a water collecting tank at the bottom is called the water spraying noise of the cooling tower. The process of generating the water spraying noise is that circulating water in the cooling tower flows downwards from top to bottom, passes through the packing layer and then falls into a water tank at the bottom of the cooling tower to cause impact noise, which is called water spraying noise. The intensity of the shower noise is related to the volume, flow rate and water falling height of the circulating water flowing through the unit time.
Disclosure of Invention
The invention aims to solve the technical problem of providing a bottom air-blast cooling tower air distribution structure which can reduce noise and ensure cooling effect.
The existing flow guiding device can cause turbulence of cooling wind speed and uneven structure, is difficult to install and does not have good flow guiding direction for circulating water. The bottom blast cooling tower air distribution structure can ensure that circulating water passing through the packing layer can only return to the water collecting tank at the bottom of the cooling tower, but not flow to the ground after falling onto the fan motor, and simultaneously ensure that cooling air blown in from the bottom enters the tower body to be in direct contact with the circulating water for cooling.
The technical scheme adopted by the invention is as follows: the bottom blast type cooling tower wind distribution structure comprises a wind distribution structure arranged between a packing layer of a cooling tower and a blower, wherein the wind distribution structure comprises an upper wind distribution plate, a lower wind distribution plate and a connecting plate, the upper ends of the upper wind distribution plate and the lower wind distribution plate are alternately arranged along the circumferential direction of the connecting plate, the lower ends of the upper wind distribution plate and the lower wind distribution plate are connected to a wind guide cylinder on the circumferential side of the blower, the upper wind distribution plate, the lower wind distribution plate and the wind guide cylinder are isolated from circulating water passing through the packing layer, a motor and the like by the connecting plate, the lower ends of the upper wind distribution plate and the lower wind distribution plate are obliquely arranged to the side wall of the cooling tower, so that circulating water can flow into a water collecting tank at the bottom of the tower along the obliquely arranged upper wind distribution plate and the lower wind distribution plate, the water falling height of the circulating water is reduced, the speed of the circulating water is slowed down when the circulating water falls into the water collecting tank, the water spraying noise is reduced, a certain gap is formed between the upper wind distribution plate and the lower wind distribution plate, the circulating water passing through the gap of the blower is used for directly cooling the circulating water passing through the packing layer, and the heat transfer efficiency of the cooling tower is improved.
Further, the inclination angle of the upper air distribution plate is 20-50 degrees, so that circulating water can fall into the water collecting tank, and meanwhile, the speed of falling into the water collecting tank is slowed down.
Further, the inclination angle of the lower air distribution plate is 20-50 degrees, so that circulating water can fall into the water collecting tank, and the speed of falling into the water collecting tank is reduced.
Further, the upper air distribution plate and the lower air distribution plate are made of aluminum, and cooling water is further cooled.
Further, the widths of the upper air distribution plate and the lower air distribution plate are gradually widened from the upper end to the lower end of the upper air distribution plate, only a small gap is reserved between the upper air distribution plate and the lower air distribution plate, circulating water is prevented from falling onto a blower in the air guide cylinder, the middle of the circulating water is lower than the two sides of the circulating water, the circulating water can fall into a water collecting tank along the upper air distribution plate and the lower air distribution plate, and the diversion effect on the circulating water is guaranteed.
The beneficial effects of the invention are as follows:
(1) The structural arrangement of the upper air distribution plate and the lower air distribution plate plays a role in guiding circulating water, so that the circulating water returns to the water collecting pool at the bottom of the cooling tower, the circulating water is prevented from falling onto the bottom air blower, the motor and the speed reducer, the short-circuit protection effect is achieved on the motor, and the service lives of the motor and the air blower are prolonged.
(2) The upper air distribution plate and the lower air distribution plate are structurally arranged, so that cooling air blown in by the bottom fan enters the tower and is directly contacted with circulating water for cooling, meanwhile, the air distribution plates further cool the circulating water by adopting materials with good heat conductivity coefficients such as aluminum, and the cooling efficiency of the cooling tower is improved.
(3) The structural arrangement of the upper air distribution plate and the lower air distribution plate reduces the water spraying height of circulating water, thereby reducing water spraying noise.
Drawings
Fig. 1 is a schematic view of the structure of the cooling tower of the present invention.
Fig. 2 is a front view of the wind distribution structure.
Fig. 3 is a top view of the wind distribution structure.
Fig. 4 is a bottom view of the wind distribution structure.
Fig. 5 is a front view of the upper air distribution plate.
Fig. 6 is a right side view of the upper air distribution plate.
Fig. 7 is a schematic structural view of the link plate.
Marked in the figure as: the cooling tower comprises a cooling tower body 1, a packing layer 2, an upper air distribution plate 4, a lower air distribution plate 5, a connecting plate 6, an air duct 7, an 8-motor 9, a water inlet pipe 10, a folded angle 11, a threaded hole 12, a threaded hole 13, a threaded hole 14, a water remover and a water collecting tank 15.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The bottom blast cooling tower mainly comprises a supporting part, a heat radiating part, a water inlet system, a water collecting system and the like. The wind distribution structure of the invention not only belongs to a heat dissipation part, but also is a component part of a water collection system.
As shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6 and fig. 7, the bottom blast cooling tower air distribution structure comprises an air distribution structure arranged between a packing layer 2 of a cooling tower 1 and an air blower (not shown in the drawings), a motor 8 is connected below the air blower, a dehydrator 14 is further arranged at the top of the cooling tower 1 and used for removing redundant water vapor in the cooling tower 1, the air distribution structure comprises an upper air distribution plate 4, a lower air distribution plate 5 and a connecting plate 6, the upper air distribution plate 4 and the lower air distribution plate 5 are all air distribution plates with the width gradually widened from the upper end to the lower end and the middle is lower than two sides, the upper air distribution plate 4 and the lower air distribution plate 5 can be particularly arranged to be trapezoidal air distribution plates with the cross section in an arc shape, the upper air distribution plate 4 and the lower air distribution plate 5 can be made of materials with good heat transfer coefficients, preferably, aluminum can be adopted, the contact area between circulating water and a heat transfer medium is increased, and the heat transfer efficiency is improved; the upper and lower air distribution plates 5, the connecting plate 6 and the air duct 7 form a semi-closed space, so that the air blower and the motor 8 are isolated from falling into water, and circulating water is prevented from falling onto the air blower and the motor 8; the upper ends of the upper air distribution plate 4 and the lower air distribution plate 5 are alternately arranged along the circumferential direction of the connecting plate 6 at equal intervals, the lower ends of the upper air distribution plate 4 and the lower air distribution plate 5 are connected to the air duct 7 at the circumferential side of the air blower, the lower ends of the upper air distribution plate 4 and the lower air distribution plate 5 are obliquely arranged towards the side wall of the cooling tower 1, and in order to adapt to different working conditions, particularly when the circulating water quantity changes, the flow rate of circulating water can be changed by adjusting the inclination angle of the upper air distribution plate 5 and the lower air distribution plate 5, so that the purpose of controlling the flow is achieved, namely the water spraying noise is reduced, and the inclination angle of the upper air distribution plate and the lower air distribution plate is preferably 45 degrees, so that the flow guiding effect is ensured.
As shown in fig. 1, 2, 3 and 4, a certain gap is formed between the upper air distribution plate 4 and the lower air distribution plate 5, specifically, the lower end of the lower air distribution plate 5 can be welded on the inner side of the air duct 7, the lower end of the upper air distribution plate 4 is welded on the inner side of the air duct 7, the gaps of the upper air distribution plate 5 and the lower air distribution plate 5 in the circumferential direction are equal, the gap in the radial direction is gradually reduced from the air blower to the packing layer 2, and the gap can enable cooling air blown by the air blower to enter the cooling tower 1 to cool circulating water.
As shown in fig. 5 and 6, the upper ends of the upper and lower air distribution plates 5 are provided with a 45-degree folded angle 10, the folded angle 10 is provided with four threaded holes 13, as shown in fig. 7, preferably, the connecting plate 6 is circular, the connecting plate 6 is provided with two rings of internal and external threaded holes 11 and 12 which are connected with the threaded holes on the folded angle 10 through bolts, each ring of threaded holes on the connecting plate 6 is uniformly distributed along the circumference, so that a uniform gap is formed between the connected upper and lower air distribution plates 5, and the angle of the folded angle 10 can be adjusted according to different working conditions so as to meet the requirements of different circulating water flows of the cooling towers 1. The upper and lower air distribution plates 5 and the connecting plate 6 are assembled to form a whole, the whole air distribution structure does not need to be disassembled and assembled, the service life is long, the cleaning is convenient, and the upper and lower air distribution plates and the air guide cylinder 7 are directly welded when in use, so that the installation and the disassembly are convenient.
Specifically, the water inlet system sprays circulating water downwards from the nozzle evenly through the water inlet pipe 9, and drops onto the packing layer 2, the packing layer 2 is cooled by increasing the contact area with the circulating water, the circulating water passes through the packing layer 2 and then contacts with cooling air blown in from the bottom, secondary cooling is performed, the cooled circulating water falls onto the upper air distribution plate 5 and the lower air distribution plate 5, and then finally falls into the water collecting tank 15 at the bottom of the cooling tower 1 along the upper air distribution plate 5 and the lower air distribution plate 5.

Claims (4)

1. Bottom blast type cooling tower cloth wind structure, its characterized in that: including setting up the wind distribution structure between packing layer (2) and the air-blower of cooling tower (1), this wind distribution structure includes grid plate (4), lower grid plate (5), link plate (6), the upper end of grid plate (4), lower grid plate (5) is along link plate (6) circumference equidistance alternate arrangement, on wind-guiding tube (7) of air-blower week side are connected to the lower extreme of grid plate (4), the lower extreme of grid plate (5) sets up to cooling tower (1) lateral wall slope, have certain clearance between grid plate (4) and the grid plate (5) down, grid plate (4) are grid plate that the width is widened gradually from upper end to its lower extreme down, the centre is less than both sides and transversal arc setting down.
2. The bottom blowing cooling tower air distribution structure of claim 1, wherein: the inclination angle of the upper air distribution plate (4) is 20-50 degrees.
3. The bottom blowing cooling tower air distribution structure of claim 1, wherein: the inclination angle of the lower air distribution plate (5) is 20-50 degrees.
4. The bottom blowing cooling tower air distribution structure of claim 1, wherein: the upper air distribution plate (4) and the lower air distribution plate (5) are made of aluminum.
CN201711233292.3A 2017-11-30 2017-11-30 Air distribution structure of bottom blowing type cooling tower Active CN107796238B (en)

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CN111928720B (en) * 2019-07-15 2022-05-10 德州贝诺风力机械设备有限公司 Packing module and cooling tower

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CN205245821U (en) * 2015-08-13 2016-05-18 华北水利水电大学 Monsoon device is prevented automatically in cooling tower import
CN107036459A (en) * 2017-06-02 2017-08-11 乳山市大洋硅胶厂 A kind of cooling tower

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Publication number Priority date Publication date Assignee Title
CN202177333U (en) * 2011-07-19 2012-03-28 中国水利水电科学研究院 Air intake flow deflector at air inlet area of natural ventilation counterflow cooling tower
CN202599142U (en) * 2012-06-21 2012-12-12 浙江秦燕化工有限公司 Cooling tower with improved water blocking device
CN205245821U (en) * 2015-08-13 2016-05-18 华北水利水电大学 Monsoon device is prevented automatically in cooling tower import
CN107036459A (en) * 2017-06-02 2017-08-11 乳山市大洋硅胶厂 A kind of cooling tower

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