Water collecting and fog dispersing filler unit and cooling tower using same

Abstract

The invention discloses a water collection and fog dissipation filler unit and a cooling tower applying the same, the filler unit comprises a first heat exchange sheet and a second heat exchange sheet, the first heat exchange sheet and the second heat exchange sheet are vertically arranged, and the surfaces of the first heat exchange sheet and the second heat exchange sheet are provided with a plurality of sealing convex strip groups; each sealing convex strip group comprises two convex strips which are opposite in convex direction, the upper parts of the two convex strips vertically extend, the lower parts of the two convex strips obliquely extend in opposite directions, the vertical sections of the two convex strips are close to each other, the oblique sections of the adjacent convex strip groups are not crossed, and the tail ends of the oblique sections are provided with a short edge interval; the first heat exchange pieces and the second heat exchange pieces are stacked in a staggered mode, so that the first protruding strips of the first heat exchange pieces and the third protruding strips of the second heat exchange pieces abut against each other in a sealed mode, and the second protruding strips of the first heat exchange pieces and the fourth protruding strips of the second heat exchange pieces abut against each other in a sealed mode. The hot channels and the cold channels are provided with heat exchange areas and flow guide areas and are arranged at intervals in a staggered mode in the stacking direction; air inlets of the hot channel and the cold channel are positioned at the bottom edge of the heat exchange sheet and are arranged at intervals along the length direction of the heat exchange sheet; air outlets are positioned at the top edge of the heat exchange sheet; and a liquid outlet is formed in the short edge of each heat exchange sheet.

Description

Technical Field

[0001] The invention relates to the technical field of circulating water cooling, and in particular to a water collecting and mist dispelling filling unit and a cooling tower using the unit. Background Art

[0002] In the petroleum, chemical and other industries, circulating water cooling systems are widely built. Traditional open cooling towers use water-spraying fillers to cool circulating water. The circulating hot water from the process device enters the cooling tower spray system, and forms spray circulating hot water through the water-spraying nozzle. The spray circulating hot water enters the water-spraying filler from top to bottom. The filler is generally made of PVC sheets. Water enters the filler and forms a water film along the PVC sheet. The dry and cold air from the outside enters the filler from bottom to top, and exchanges heat with the water film. The water film evaporates and cools down. The air is heated and humidified to form hot and humid air. A fan is installed on the top of the cooling tower to discharge the hot and humid air out of the tower, and the circulating hot water is cooled and turned into circulating cold water. The hot and humid air coming out of the top of the water-spraying filler is discharged from the tower through the cooling tower wind pipe. Because the hot and humid air discharged from the tower is high in humidity and temperature, when the ambient temperature is low, the hot and humid air discharged from the tower mixes with the cold air. Due to cooling and condensation, a fog group containing many tiny liquid particle groups will be formed, so there is a need for demisting.

[0003] For example, Chinese patent application CN103727805A discloses a deep condensation demisting environmental protection device. The demisting environmental protection device includes a tower body, in which fillers, water spraying devices, water collectors, and heat exchange devices are arranged from bottom to top in sequence. An air outlet is arranged at the top of the tower body, and a fan is installed in the air outlet. A transition section air chamber is arranged in the tower body between the heat exchange device and the air outlet. During operation, the hot circulating cooling water sprayed by the water spraying device is cooled by the cold air entering through the lower air inlet of the cooling tower in the fillers, and the temperature of the circulating cooling water decreases; the temperature of the cold air in the fillers increases, and the moisture content increases, forming humid hot air that is basically in a saturated state; the humid hot air enters the hot air channel after passing through the water collector, and then enters the heat exchange device to exchange heat with the dry cold air entering the heat exchange device through the cold air channel; after passing through the heat exchange device, the humid hot air and the dry cold air are mixed in the transition section air chamber and discharged into the atmosphere by the fan. This type of solution has limited heat exchange area, low heat exchange efficiency, and poor water collection effect; due to the problem of cold air and hot air mixing on both sides, it needs to be fully encapsulated and installed, and the packaging and installation costs are high; due to the installation of a water collector, the overall height of the tower is relatively high; in addition, the recovery efficiency of the salt-containing spray droplets and the condensed water generated during the heat exchange process in this type of solution is low.

[0004] For another example, Chinese Patent Application CN112857087A discloses a fog elimination device and a cooling tower, which relates to the technical field of cooling towers. The fog elimination device includes: a first flow path and a second flow path stacked on top of each other, which exchange heat between a first air flow and a second air flow flowing from bottom to top; discharging the first air flow flowing out of the first flow path to a first flow outlet above the fog elimination device; discharging the second air flow flowing out of the second flow path to a second flow outlet above the fog elimination device; and the first flow outlet and the second flow outlet are alternately stacked. This fog elimination device can play a role in water saving and fog elimination. However, this type of solution also requires a water collector, which not only occupies the space inside the tower but also increases the cost of the tower. In addition, the condensed water recovered during the heat exchange process will flow back into the tower from the air inlet position of the fog elimination device, and the air inlet is also the drainage port, forming a gas-liquid countercurrent, and gas-liquid entrainment is likely to occur during this process.

[0005] Therefore, there is an urgent need for a water collection and fog elimination packing unit and a cooling tower using this unit, which not only do not require the use of a water collector, but also have higher heat exchange efficiency and water collection rate, and can effectively reduce gas-liquid entrainment.

[0006] The information disclosed in this background art section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as an admission or any form of implication that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Invention

[0007] The purpose of the present invention is to provide a water collection and fog elimination packing unit and a cooling tower using this unit. By arranging a specially arranged sealing rib group on heat exchange fins with low processing cost and easy assembly, the first heat exchange fins and the second heat exchange fins can be constructed to be stacked in a staggered manner, and then cold and hot channels with a diversion area and a heat exchange area, which are relatively independent and can conduct partition heat exchange, can be obtained. This not only does not require the use of a water collector, but also can effectively improve the heat exchange efficiency.

[0008] Another purpose of the present invention is to provide a water collection and fog elimination packing unit and a cooling tower using this unit. By arranging vertical diversion grooves in the heat exchange area inside the hot channel and inclined diversion grooves in the diversion area inside the hot channel, a diversion facility for saline spray droplets and condensed water is constructed, which not only has a high water collection rate but also can effectively reduce gas-liquid entrainment.

[0009] To achieve the above object, according to the first aspect of the present invention, the present invention provides a water collection and fog elimination filler unit, including: a first heat exchange fin, which is vertically arranged and has a plurality of groups of sealing rib groups on its surface. Each group of sealing rib groups includes a first rib and a second rib with opposite protruding directions, the upper parts of which extend vertically, and the lower parts extend obliquely in opposite directions. The vertical sections of the two ribs are closely adjacent to each other, and the inclined sections of adjacent rib groups do not cross and have a short side spacing at the ends; a second heat exchange fin, which is vertically arranged and has a plurality of groups of sealing rib groups on its surface. Each group of sealing rib groups includes a third rib and a fourth rib with opposite protruding directions, the upper parts of which extend vertically, and the lower parts extend obliquely in opposite directions. The vertical sections of the two ribs are closely adjacent to each other, and the inclined sections of adjacent rib groups do not cross and have a short side spacing at the ends; the first heat exchange fin and the second heat exchange fin are stacked in a staggered layer, so that the first rib and the third rib are in contact and sealed, and the second rib and the fourth rib are in contact and sealed, forming heat channels and cold channels with heat exchange areas and diversion areas, and arranged at intervals and alternately along the stacking direction; the air inlets of the heat channels and the cold channels are located at the bottom edges of the heat exchange fins and are arranged at intervals along the length direction of the heat exchange fins, and the air outlets are located at the top edges of the heat exchange fins; a liquid discharge port is formed at the short side of the heat exchange fin.

[0010] Further, in the above technical solution, the heat channels include a left-tilted heat channel and a right-tilted heat channel arranged at intervals along the stacking direction. The air inlet of the left-tilted heat channel guides the humid and hot air to the left and enters the corresponding heat exchange area through the diversion area of the channel. The air inlet of the right-tilted heat channel guides the humid and hot air to the right and enters the corresponding heat exchange area through the diversion area of the channel; the cold channels include a left-tilted cold channel and a right-tilted cold channel arranged at intervals along the stacking direction. The air inlet of the left-tilted cold channel guides the dry and cold air to the left and enters the corresponding heat exchange area through the diversion area of the channel. The air inlet of the right-tilted cold channel guides the dry and cold air to the right and enters the corresponding heat exchange area through the diversion area of the channel; the heat exchange areas of the left-tilted heat channel and the right-tilted cold channel overlap in the projection along the stacking direction of the heat exchange fins and achieve partition heat exchange; the heat exchange areas of the right-tilted heat channel and the left-tilted cold channel overlap in the projection along the stacking direction of the heat exchange fins and achieve partition heat exchange.

[0011] Further, in the above technical solution, the heat exchange area is the area between the vertical sections of adjacent sealing rib groups; the diversion area is the area between the same-direction inclined sections of adjacent sealing rib groups.

[0012] Further, in the above technical solution, the heat channels are used to introduce the humid and hot air obtained by heat exchange of the circulating hot water with the dry and cold air; the cold channels can be used to introduce the dry and cold air; the humid and hot air in the heat channels and the dry and cold air in the cold channels are subjected to partition heat exchange and then can be discharged from the top of the water collection and fog elimination filler unit respectively and directly mixed.

[0013] Further, in the above technical solution, a diversion part for guiding the condensed water formed after heat exchange of the humid and hot air to the liquid discharge port can be provided in the heat channels.

[0014] Further, in the above technical solution, the flow guiding part may include: a vertical flow guiding groove, which is arranged in the heat exchange area at the upper part of the heat exchange fin and may be composed of a vertically extending protrusion and / or depression; an inclined flow guiding groove, which is arranged in the flow guiding area at the lower part of the heat exchange fin and may be composed of an inclined extending protrusion and / or depression, and the inclined flow guiding groove may be intermittently arranged.

[0015] Further, in the above technical solution, the directions of the protrusions or depressions of adjacent vertical flow guiding grooves in the same heat exchange area may be opposite; the directions of the protrusions or depressions of adjacent inclined flow guiding grooves with different inclined directions in the same flow guiding area may be opposite.

[0016] Further, in the above technical solution, the protruding directions of the vertical flow guiding grooves and the inclined flow guiding grooves where the adjacent first and second heat exchange fins overlap in the stacking direction may be opposite.

[0017] Further, in the above technical solution, a water collecting tank may be arranged at the liquid discharge port. The top sealing surface of the water collecting tank may be abutted against the liquid discharge port to form isolation of the cold and hot channels at the liquid discharge port; the double grooves arranged on both sides of the water collecting tank can be used to collect the salt-containing spray droplets from the hot channel and the condensed water formed after heat exchange.

[0018] Further, in the above technical solution, both the first heat exchange fin and the second heat exchange fin may be in a strip-shaped structure and have the same size.

[0019] Further, in the above technical solution, the tops of the first heat exchange fin and the second heat exchange fin may be horizontally arranged to form a hot channel air outlet and a cold channel air outlet that are spaced apart in the stacking direction, so that the cold and hot air after partition heat exchange are directly mixed at the air outlet.

[0020] According to the second aspect of the present invention, the present invention provides a cooling tower, which applies the water collecting and demisting packing unit of any one of the foregoing, and the water collecting and demisting packing unit is arranged in the upper part of the cooling tower. A partition is vertically extended downward at each water collecting tank to form relatively independent wet and hot air channels and dry and cold air channels. A wind door that can be selectively opened is provided at the bottom end of the partition of the dry and cold air channels.

[0021] Further, in the above technical solution, the wind door may include a rotating shaft and a rotating baffle that can rotate along the rotating shaft. By selectively opening and closing the wind door, the water collecting and demisting operation mode in winter and the thermal operation mode in summer can be realized.

[0022] Further, in the above technical solution, a spraying unit may be arranged below the water collecting and demisting packing unit, and a water spraying packing is arranged below the spraying unit; the circulating hot water from the spraying unit is in reverse contact with the dry and cold air from the lower part of the cooling tower at the water spraying packing to obtain wet and hot air.

[0023] Furthermore, in the above technical solution, shutters may be provided at corresponding positions of the dry cold air passage, so as to provide dry cold air outside the tower to the dry cold air passage in an operation mode in which the damper is closed.

[0024] Furthermore, in the above technical solution, a wind tube and a fan inside the wind tube may be provided on the top of the cooling tower to provide power for the airflow running in the cooling tower.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1) The first heat exchanger fin and the second heat exchanger fin of the present invention can be made into long strips, which are easy to process and can be adaptively adjusted according to the width of the cooling tower, saving costs; through the staggered stacking arrangement of the first heat exchanger fin and the second heat exchanger fin and the structural arrangement of the sealing rib group, relatively independent cold and hot channels that can perform inter-wall heat exchange can be constructed, which not only does not require the use of a water collector, saves cooling tower space, but also effectively improves heat exchange efficiency, and can realize that the air inlets of cold and hot air are arranged at intervals at the bottom edge of the heat exchanger fin (i.e., independent of each other), and the drain port is located between the air inlets of cold and hot air, which not only completely separates the air inlets of the hot channel and the cold channel, but also avoids interference between the gas and liquid phases to the greatest extent;

[0027] 2) The hot channel of the water-collecting and mist-eliminating packing unit of the present invention is used to introduce the hot and humid air obtained by circulating hot water through heat exchange with dry cold air, and the cold channel is used to introduce dry cold air (i.e., winter atmosphere). The hot and humid air in the hot channel and the dry cold air in the cold channel are respectively discharged from the top of the water-collecting and mist-eliminating packing unit of the present invention and directly mixed after the inter-wall heat exchange. No mixing space is required, which can further save the use space of the cooling tower;

[0028] 3) Through the structural arrangement of the left-inclined hot channel and the right-inclined hot channel in the water-collecting packing unit of the present invention, the hot and humid air entering the air inlet of the hot channel is turned twice during the process of entering the heat exchange zone through the guide zone, that is, from vertically upward to left-inclined or right-inclined, and then turned to vertically upward. The salt-containing spray water droplets entrained by the hot and humid air have different densities and large differences in inertia force. During the turning process, the salt-containing droplets are helped to hit the wall surface and escape; in addition, at the part where the guide zone and the heat exchange zone are connected, the hot and humid air and the dry cold air have actually undergone inter-wall heat exchange. In this area and the heat exchange zone, condensed water in the hot and humid air is precipitated through the inter-wall heat exchange, and the turning of the airflow also helps to separate and collect the condensed water from the airflow;

[0029] 4) In the present invention, through the arrangement of the vertical diversion channels in the heat exchange area of the water collection packing unit and the inclined diversion channels in the diversion area, the humid and hot air entraining the spray droplets enters the left-leaning heat channel or the right-leaning heat channel. Under the action of the inclined diversion channels in the corresponding channels, the humid and hot air is cut while turning, which is more conducive to gas-liquid separation. During this process, due to the different densities and large differences in inertial forces of the spray water droplets entrained by the humid and hot air, they strike the inclined diversion channels due to inertia and are captured, and most of the salt-containing spray water droplets entrained by the humid and hot air can be removed. The humid and hot air that has removed most of the spray water droplets entrained by it passes through the heat exchange area above the demisting packing unit. Under the action of the vertical diversion channels, the humid and hot air turns again here, changing from left-leaning or right-leaning to vertically upward. During this process, due to the different densities and large differences in inertial forces of the condensed water generated by heat exchange in the humid and hot air, it strikes the vertical diversion channels due to inertia and is captured. Therefore, on the basis of the structural turning of the heat channel itself in the present invention, the structures of inclined diversion channels and vertical diversion channels are added in the diversion area and the heat exchange area, and the water collection efficiency can be further improved, effectively reducing the droplet entrainment of the humid and hot air flow. Through the secondary entrained droplet series capture structure of the present invention, more than 95% of the entrained liquid can be removed, and the removal rate of entrained droplets above 20 μm is close to 100%;

[0030] 5) In the design of the water collection tank of the present invention, by making the top sealing surface abut against the liquid discharge port, an effective isolation of the cold and hot channels at the liquid discharge port can be formed; by separating the air inlets of the cold and hot channels from the liquid discharge port, the entrainment caused by gas-liquid countercurrent in the prior art can be effectively reduced; at the same time, the setting of the water collection tank can better support the weight of the entire water collection and demisting packing unit without deformation;

[0031] 6) For the cooling tower of the present invention, since the packing layer constructed by the water collection and demisting packing unit applied has a significant water collection function, the setting of the traditional water collector can be cancelled in the cooling tower, so that there is sufficient rotation space for the air damper, and the overall height of the tower can be reduced by 1-2 meters compared with the conventional technology, which can significantly reduce the equipment cost;

[0032] 7) When the humid and hot air and the dry cold air enter and pass through the water collection and demisting packing unit in the present invention, the gas flow rate is reduced to be the same as the wind speed of the tower cross-section. As a result, the pressure drop of the packing layer constructed by the water collection and demisting packing unit is only about 50% of that of the traditional technology;

[0033] 8) The cooling tower of the present invention can have two modes: water collection and demisting operation and thermal operation, which can be respectively applicable to the requirements of different seasons and has the characteristics of flexible operation.

[0034] The above description is only an overview of the technical solution of the present invention. In order to be able to more clearly understand the technical means of the present invention and implement it according to the content of the specification, and at the same time to make the above and other purposes, technical features and advantages of the present invention more understandable, one or more preferred embodiments are listed below and described in detail with reference to the accompanying drawings as follows. Description of the Drawings

[0035] Figure 1 It is a schematic structural view of the first heat exchange fin in the water collection and demisting packing unit of the present invention.

[0036] Figure 2 It is a schematic structural view of the second heat exchange fin in the water collection and demisting packing unit of the present invention.

[0037] Figure 3 is Figure 2 The enlarged schematic view of A in

[0038] Figure 4 It is the front view of the staggered stacking of the first and second heat exchange fins in the water collection and demisting packing unit of the present invention.

[0039] Figure 5 It is the three-dimensional Figure 1 (showing the water collection tank arranged at the bottom).

[0040] Figure 6 It is the three-dimensional Figure 2 (showing the bottom liquid discharge port and the inlets of the bottom cold and hot channels).

[0041] Figure 7 It is a schematic structural view of the first heat exchange fin in the water collection and demisting packing unit of the present invention provided with a diversion part.

[0042] Figure 8 It is the three-dimensional view of the staggered stacking of the first and second heat exchange fins provided with a diversion part in the water collection and demisting packing unit of the present invention.

[0043] Figure 9 It is a schematic structural view of the water collection tank in the water collection and demisting packing unit of the present invention.

[0044] Figure 10 It is a schematic structural view of the interior of the cooling tower of the present invention.

[0045] Main reference numeral description:

[0046] 1-first heat exchanger, 11-first top edge, 12-first bottom edge, 121-first interval short edge, 13-first convex strip, 131-first convex strip vertical segment, 132-first convex strip inclined segment, 14-second convex strip, 141-second convex strip vertical segment, 142-second convex strip inclined segment, 2-second heat exchanger, 21-second top edge, 22-second bottom edge, 221-second interval short edge, 23-third convex strip, 231-third convex strip vertical segment, 232-third convex strip inclined segment, 24-fourth convex strip, 241-fourth convex strip vertical segment, 24 2-the fourth convex inclined section, 3-the guide part, 31-the vertical guide protrusion, 32-the vertical guide depression, 33-the inclined guide protrusion, 34-the inclined guide depression, 4-the stacked water collecting and mist eliminating filler unit, 40-the drainage port, 41-the heat exchange area, 42-the guide area, 43-the left hot channel air inlet, 44-the right hot channel air inlet, 45-the right cold channel air inlet, 46-the left cold channel air inlet, 5-the water collecting groove, 51-the top sealing surface, 52-the groove, 6-the partition, 7-the damper, 8-the humid hot air channel, 9-the dry cold air channel;

[0047] 100-cooling tower, 101-spraying unit, 102-spraying filler, 103-louver, 104-wind duct, 105-fan. DETAILED DESCRIPTION

[0048] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0049] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0050] In this document, for the convenience of description, spatial relative terms such as "below", "below", "down", "above", "above", "upper", etc. may be used to describe the relationship between one element or feature and another element or feature in the accompanying drawings. It should be understood that the spatial relative terms are intended to include different orientations of the object in use or operation in addition to the orientation depicted in the figure. For example, if the object in the figure is turned over, the element described as being "below" or "below" other elements or features will be oriented "above" the element or feature. Therefore, the exemplary term "below" can include both below and above. Objects may also have other orientations (rotated 90 degrees or other orientations) and the spatial relative terms used in this document should be interpreted accordingly.

[0051] In this text, the terms "first", "second", etc. are used to distinguish two different components or parts, rather than to define a specific position or relative relationship. In other words, in some embodiments, the terms "first", "second", etc. can also be interchanged with each other.

[0052] Example 1

[0053] As Figures 1 to 6 shown, this embodiment provides a water collecting and fog eliminating packing unit, which at least includes a first heat exchange fin 1 and a second heat exchange fin 2. Among them, the first heat exchange fin 1 is vertically arranged and has a first top edge 11 and a second top edge 12. A plurality of groups of sealing rib groups are arranged on the surface of the first heat exchange fin 1 (refer to Figure 1 , and each group of rib groups is approximately in a herringbone shape). Each group of sealing rib groups includes a first rib 13 and a second rib 14 with opposite protruding directions, vertically extending in the upper part, and obliquely extending in opposite directions in the lower part. The vertical sections of the two ribs are closely adjacent to each other (that is, the first rib 13 protrudes towards the Figure 1 back surface of the first heat exchange fin 1 in Figure 1 , and the second rib 14 protrudes towards the Figure 1 front surface of the first heat exchange fin 1 in Figure 1 ). The lower part of the first rib 13 has an inclined section 132 inclined towards the Figure 1 left side in Figure 2 The lower part of the second rib 14 has an inclined section 142 inclined towards the Figure 2 right side in Figure 2 The inclined sections of adjacent rib groups do not cross and have a short side spacing at the ends (that is, the bottom short side 121 in Figure 2 ). The overall shape and size of the second heat exchange fin 2 are the same as those of the first heat exchange fin 1, and it is also vertically arranged and has a second top edge 21 and a second bottom edge 22. A plurality of groups of sealing rib groups are also arranged on the surface of the second heat exchange fin 2. Each group of sealing rib groups includes a third rib 23 and a fourth rib 24 with opposite protruding directions, vertically extending in the upper part, and obliquely extending in opposite directions in the lower part. The vertical sections of the two ribs are closely adjacent to each other (that is, the third rib 23 protrudes towards the Figures 1 to 3 front surface of the second heat exchange fin 2 in

[0054] Further as Figures 4 to 6As shown in the figure, the water collection and demisting packing unit 4 of this embodiment is constructed by stacking the first heat exchange fin 1 and the second heat exchange fin 2 in a staggered manner. Specifically, after stacking, the first convex strip 13 and the third convex strip 23 are in abutting seal, and the second convex strip 14 and the fourth convex strip 24 are in abutting seal, forming heat exchange zones 41 and diversion zones 42, and heat channels and cold channels that are arranged at intervals and staggered along the stacking direction. The air inlets of the heat channels and the cold channels are located at the bottom edges of the heat exchange fins and are arranged at intervals along the length direction of the heat exchange fins (refer to Figure 4 , Figure 6 , that is, they are arranged at intervals and corresponding below adjacent sealing convex strip groups), and the air outlets are located at the top edges of the heat exchange fins (refer to Figure 4 , Figure 6 ), and liquid discharge ports 40 are formed at the short edges of the heat exchange fins.

[0055] Adopting the above technical solution of this embodiment, the first heat exchange fin and the second heat exchange fin can be made into long strips, which are convenient for processing and can be adaptively adjusted according to the tower width of the cooling tower, saving costs; through the staggered stacking arrangement of the first heat exchange fin and the second heat exchange fin and the structural arrangement of the sealing convex strip group, relatively independent cold and heat channels that can conduct partition heat exchange can be constructed. Not only does it not require the use of a water collector, saving space in the cooling tower, but it can also effectively improve the heat exchange efficiency. The air inlets of the cold and hot air can be arranged at intervals at the bottom edges of the heat exchange fins (that is, independently of each other), and the liquid discharge ports are located between the air inlets of the cold and hot air. This not only completely separates the air inlets of the heat channels and the cold channels, but also maximally avoids interference between the gas-liquid two phases. The heat channel of this embodiment is used to introduce the humid hot air obtained by heat exchange between the circulating hot water and the dry cold air, and the cold channel is used to introduce dry cold air (that is, the atmosphere in winter). After the humid hot air in the heat channel and the dry cold air in the cold channel conduct partition heat exchange, they are discharged from the top of the water collection and demisting packing unit of the present invention and directly mixed. That is, by horizontally arranging the top edges of the first heat exchange fin and the second heat exchange fin, heat channel air outlets and cold channel air outlets arranged at intervals can be formed after the heat exchange fins are stacked and assembled. Through such an arrangement method, the cold and hot air after partition heat exchange are directly mixed at the air outlets, without the need to provide a mixing space, which can further save the use space of the cooling tower.

[0056] Furthermore, as shown in Figures 4 to 6 , the heat channel includes a left-tilted heat channel and a right-tilted heat channel that are arranged at intervals along the stacking direction (refer to the arrow directions in Figure 4 and Figure 6 , where the solid arrows represent the flow direction of the humid hot air in the heat channel, and the dashed arrows represent the flow direction of the dry cold air in the cold channel). Among them, the air inlet 43 of the left-tilted heat channel guides the humid hot air to the left and enters the corresponding heat exchange zone 41 through the diversion zone 42 of the left-tilted heat channel (refer to Figure 4), the air inlet 44 of the right-leaning hot channel guides the humid and hot air to the right and enters the corresponding heat exchange area 41 through the diversion area 42 of the right-leaning hot channel. The left-leaning hot channel and the right-leaning hot channel here are arranged at intervals along the stacking direction of the heat exchange fins ( Figure 6 only shows the air inlets of a pair of hot channels, that is, the air inlet 43 of the left-leaning hot channel and the air inlet 44 of the right-leaning hot channel). Further, as shown in Figures 4 to 6 , the cold channel includes a left-leaning cold channel and a right-leaning cold channel arranged at intervals along the stacking direction. The air inlet 46 of the left-leaning cold channel guides the dry and cold air to the left and enters the corresponding heat exchange area 41 through the diversion area 42 of the left-leaning cold channel (refer to Figure 4 ), and the air inlet 45 of the right-leaning cold channel guides the dry and cold air to the right and enters the corresponding heat exchange area 41 through the diversion area 42 of the right-leaning cold channel. The left-leaning cold channel and the right-leaning cold channel here are also arranged at intervals along the stacking direction of the heat exchange fins ( Figure 6 only shows the air inlets of a pair of cold channels, that is, the air inlet 46 of the left-leaning cold channel and the air inlet 45 of the right-leaning cold channel). Through such a setting method, the projections of the heat exchange areas of the left-leaning hot channel and the right-leaning cold channel on the heat exchange fin stacking direction coincide and achieve partition wall heat exchange ( Figure 4 and Figure 6 the hot and cold airflows indicated by the solid and dotted arrows are not on the same layer, but in adjacent channels); similarly, the projections of the heat exchange areas of the right-leaning hot channel and the left-leaning cold channel on the heat exchange fin stacking direction coincide and achieve partition wall heat exchange.

[0057] The hot channel of this embodiment is used to introduce the humid and hot air obtained by exchanging heat with the dry and cold air through circulating hot water, and the cold channel is used to introduce the dry and cold air. The humid and hot air in the hot channel and the dry and cold air in the cold channel are subjected to partition wall heat exchange and then discharged from the top of the water collection and demisting filler unit and directly mixed. Through the structural setting of the left-leaning hot channel and the right-leaning hot channel in the foregoing embodiment of the present invention, when the humid and hot air entering the air inlet of the hot channel enters the heat exchange area (that is, the area between the vertical sections of adjacent sealing rib groups) through the diversion area (that is, the area between the same-direction inclined sections of adjacent sealing rib groups), the humid and hot air undergoes two turns, that is, from vertically upward to left-leaning or right-leaning, and then turns to vertically upward. Due to the different densities and large differences in inertial forces of the salt-containing spray water droplets entrained by the humid and hot air, during the turning process, it helps the salt-containing droplets to hit the wall surface and escape; in addition, at the connection part between the diversion area and the heat exchange area, the humid and hot air and the dry and cold air have actually undergone partition wall heat exchange. In this area and the heat exchange area, through the partition wall heat exchange, the condensed water in the humid and hot air is precipitated, and the turning of the air flow also helps the separation and collection of the condensed water and the air flow.

[0058] Further, as shown in Figure 7 、 8As shown, in order to further improve the water collection and fog elimination effect, a diversion part 3 for guiding the condensed water formed after heat exchange between the salt-containing spray droplets and the humid hot air to the liquid discharge port is provided in the hot channels (including the left-inclined hot channel and the right-inclined hot channel) of this embodiment. Preferably but not restrictively, the diversion part may further include a vertical diversion groove and an inclined diversion groove. Refer to Figure 7 , taking the diversion part provided on the first heat exchange fin 1 as an example, the vertical diversion groove is arranged in the heat exchange area at the upper part of the heat exchange fin and is composed of a vertically extending protrusion 31 and / or a depression 32. The height of the protrusion or depression of the vertical diversion groove is one-fourth to three-fourths of the corresponding channel thickness, preferably half. The inclined diversion groove is arranged in the diversion area at the lower part of the heat exchange fin and is composed of an inclinedly extending protrusion 33 and / or a depression 34. In order to construct a flow channel convenient for guiding the droplets to the liquid discharge port, the inclined diversion groove preferably adopts an intermittent arrangement. Further as Figure 7 、 8 shown, preferably but not restrictively, the directions of the protrusions or depressions of adjacent vertical diversion grooves in the same heat exchange area are opposite; the directions of the protrusions or depressions of the inclined diversion grooves with different inclined directions in the same diversion area are opposite. Further, the directions of the protrusions of the vertical diversion grooves and the inclined diversion grooves that overlap in the stacking direction of adjacent first and second heat exchange fins are opposite.

[0059] In this embodiment, through the arrangement of the vertical diversion grooves in the heat exchange area and the inclined diversion grooves in the diversion area, the humid hot air entraining the spray droplets enters the left-leaning heat channel or the right-leaning heat channel through the left-leaning heat channel air inlet or the right-leaning heat channel air inlet. Under the action of the inclined diversion grooves in the corresponding channels, the humid hot air is cut while turning, which is more conducive to gas-liquid separation. In this process, due to the different densities and large differences in inertial forces of the spray water droplets entrained by the humid hot air, they strike the inclined diversion grooves due to inertia and are captured, and most of the salt-containing spray water droplets entrained by the humid hot air can be removed; the humid hot air that has removed most of the spray water droplets entrained by the humid hot air passes through the heat exchange area above the demisting filler unit. Under the action of the vertical diversion grooves, the humid hot air turns again here, changing from left-leaning or right-leaning to vertically upward. In this process, the condensed water generated by heat exchange in the humid hot air has different densities and large differences in inertial forces, and strikes the vertical diversion grooves due to inertia and is captured. Therefore, on the basis of the structural turning of the heat channel itself, the structures of the inclined diversion grooves and the vertical diversion grooves are added in the diversion area and the heat exchange area, and the water collection efficiency can be further improved, effectively reducing the droplet entrainment of the humid hot air flow. Through the secondary entrained droplet series capture structure (i.e., the inclined diversion grooves in the diversion area and the vertical diversion grooves in the heat exchange area) of this embodiment, more than 95% of the entrained liquid can be removed, and the removal rate of the entrained droplets above 20 μm is close to 100%. It should be noted here that the aforementioned vertical diversion grooves and inclined diversion grooves can also be arranged at the corresponding positions in the cold channels (including the left-leaning cold channel and the right-leaning cold channel) for use when the cooling tower of the present invention operates in the thermal operation mode in summer (i.e., the humid hot air also enters the cold channels).

[0060] Furthermore, as Figure 5 , 9 shown, a water collection tank 5 can be arranged at the liquid discharge port of this embodiment. The top sealing surface 51 of the water collection tank abuts against the liquid discharge port 40 (refer to Figure 6 ), forming the isolation of the cold and heat channels at the liquid discharge port; the double grooves 52 arranged on both sides of the water collection tank 5 are used to collect the salt-containing spray droplets from the heat channel and the condensed water formed after heat exchange. Through the design of the top sealing surface of the water collection tank, the cold and heat channels can be effectively isolated at the liquid discharge. In addition, the air inlets and the liquid discharge ports of the cold and heat channels are separated, which can effectively reduce the entrainment caused by gas-liquid countercurrent in the prior art; through the abutment of the liquid discharge port 40 and the water collection tank 5, the weight of the entire water collection and demisting filler unit can be better supported without deformation.

[0061] Example 2

[0062] As Figure 10As shown in the figure, this embodiment provides a cooling tower 100, which applies the water collection and demisting filler unit 4 as described in the foregoing Embodiment 1. The water collection and demisting filler unit 4 is strip-shaped and horizontally arranged at the upper part inside the cooling tower 100. The heat exchange fin manufacturing die of the water collection and demisting filler unit 4 is provided with half of the adjacent seal rib groups on the foregoing heat exchange fins and the inclined diversion grooves and vertical diversion grooves therebetween. A rolled PVC or PP sheet can continuously transfer the pattern on the die to the sheet through a thermoforming machine to form heat exchange fins. When the width of the cooling tower 100 to which the water collection and demisting filler unit is applied is small, the length of the heat exchange fin sheet after transfer can be controlled according to the tower width, and the processed heat exchange fins are assembled into the water collection and demisting filler unit 4; when the width of the cooling tower 100 to which the water collection and demisting filler unit is applied is large, the length of the heat exchange fin sheet after transfer is controlled according to a partial length of the tower width, and the processed heat exchange fins are assembled into the water collection and demisting filler unit 4 and installed in the tower, which is not only convenient for processing and manufacturing but also has strong adaptability.

[0063] Further as Figure 10 shown, a partition 6 is vertically extended downward at the water collection tank 5 of the water collection and demisting filler unit to form relatively independent humid and hot air channels 8 and dry and cold air channels 9. A damper 7 that can be selectively opened is provided at the bottom end of the partition of the dry and cold air channel 9. Further, the damper 7 may include a rotating shaft and a rotating baffle that can rotate along the rotating shaft. By selectively opening and closing the damper 7, the water collection and demisting operation mode in winter and the thermal operation mode in summer can be realized. Further as Figure 10 shown, a spray unit 101 is provided below the filler assembly, and a splash packing 102 is provided below the spray unit 101. The circulating hot water from the spray unit 101 contacts the dry and cold air from the lower part of the cooling tower 100 in a countercurrent manner at the splash packing 102 to obtain the humid and hot air that enters the hot channel in the foregoing Embodiment 1. Further as Figure 10 shown, louvers 103 are provided at corresponding positions of the dry and cold air channels to provide dry and cold air outside the tower for the dry and cold air channels in the operation mode when the damper is closed. A wind barrel 104 and a fan 105 inside the wind barrel are provided at the top of the cooling tower 100 to provide power for the air flow operating inside the cooling tower.

[0064] With the cooling tower of this embodiment, since the water collection and fog elimination filler unit has a remarkable water collection function, the cooling tower can eliminate the setting of the traditional water collector, providing sufficient rotation space for the air damper. The overall tower height can be reduced by 1-2 meters compared with the conventional technology, significantly reducing the equipment cost. When the humid and hot air enters and exits the water collection and fog elimination filler unit, the gas flow rate decreases to the same as the cross-sectional wind speed of the tower, resulting in the pressure drop of the filler layer formed by the water collection and fog elimination filler unit being only about 50% of that of the traditional technology. Due to the staggered arrangement of the cold and hot channels in the filler unit, the air can be quickly and evenly mixed after leaving the filler layer through the cold and hot channel outlets at the top, eliminating the need for additional mixing space in the upper part of the cooling tower and further reducing the tower height.

[0065] The cooling tower of this embodiment can have two operating modes: namely, the water collection and fog elimination operating mode and the thermal operating mode. Specifically, by setting the rotating baffle of the air damper 7, in summer, the rotating baffle of the air damper 7 is in the vertical position, and at this time, the louver 103 is closed. The humid and hot air can be discharged from the cooling tower 100 through the cold and hot channels of the water collection and fog elimination filler unit 4 simultaneously. This is the thermal operating mode. In winter, the rotating baffle of the air damper is in the horizontal position (i.e., the air damper is closed), and at this time, the louver 103 is opened. The dry and cold air from the louver enters the cold channel of the filler unit 4 through the dry and cold air channel 9, and the humid and hot air enters the hot channel of the filler unit 4 through the humid and hot air channel 8. This is the water collection and fog elimination operating mode. It can meet the requirements of different seasons respectively and has the characteristics of flexible operation.

[0066] The process of water collection and fog elimination of the cooling tower will be described in detail below (refer to Figures 1 to 10 ):

[0067] In the winter atmospheric environment, there is dry and cold air. The dry and cold air enters the dry and cold air channel 9 through the louver 103, and further enters the water collection and demisting filler unit 4 through the cold channel air inlets (i.e., the left-inclined cold channel air inlet 46 and the right-inclined cold channel air inlet 45); the humid and hot air carrying entrained spray droplets rising at the water spray filler 102 enters the humid and hot air channel 8, and then reaches the hot channel air inlets of the water collection and demisting filler unit 4 (i.e., the left-inclined hot channel air inlet 43 and the right-inclined hot channel air inlet 44). Under the action of the left and right inclinations of the hot channel, the humid and hot air deflects. During this process, the air flow turns twice. Due to inertia, the salt-containing spray droplets have a large turning radius and cannot follow the air flow to turn, so they are captured and collected, and a part of the salt-containing droplets entrained by the humid and hot air flow can be removed; at the same time, due to the inclined diversion grooves provided in the diversion areas of the left-inclined hot channel and the right-inclined hot channel, the salt-containing droplets entrained by the humid and hot air flow can be further removed; the humid and hot air removing part of the entrained salt-containing spray droplets further enters the heat exchange areas of the left-inclined hot channel and the right-inclined hot channel, and respectively conducts partition heat exchange with the dry and cold air entering the right-inclined cold channel and the left-inclined cold channel, and the humid and hot air is condensed. Due to the heat exchange with the cold air, the temperature of the humid and hot air drops, and the saturated humid and hot air precipitates condensed water as the temperature drops. The condensed water adheres to the heat exchange fins and flows with the humid and hot air; the humid and hot air carrying a small amount of salt-containing spray droplets and a large amount of condensed water is diverted downward by the vertical diversion grooves, and continues to flow along the inclined diversion grooves, and flows downward at the discontinuous points of the inclined diversion grooves, and further enters the grooves 52 of the water collection tank 5; after the cold and hot air flows in the filler layer constructed by the water collection and demisting filler unit 4 are heat-exchanged, the dry and cold air from the outside is heated and the temperature rises, and the humid and hot air is cooled. Finally, the cooled humid and hot air and the heated dry and cold air leave the water collection and demisting filler unit 4 and are mixed to become unsaturated air, and then are discharged outside the tower through the fan 105, achieving the purpose of water collection and demisting.

[0068] The foregoing description of the specific exemplary embodiments of the present invention is for purposes of illustration and exemplification. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is obvious that many changes and variations are possible in light of the above teaching. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical applications, so that those skilled in the art can implement and utilize various different exemplary embodiments of the present invention, as well as various different selections and changes. Any simple modification, equivalent change, and modification made to the above exemplary embodiments shall fall within the protection scope of the present invention.

Claims

1. A water collecting and fog dissipating packing unit, characterized in that, it includes: A first heat exchange fin, which is vertically arranged and has multiple groups of sealing rib groups on its surface. Each group of sealing rib groups includes a first rib and a second rib with opposite protruding directions, the upper parts of which extend vertically, and the lower parts extend obliquely in opposite directions. The vertical sections of the two ribs are closely adjacent to each other, and the inclined sections of adjacent rib groups do not cross and have a short side spacing at the ends; A second heat exchange fin, which is vertically arranged and has multiple groups of sealing rib groups on its surface. Each group of sealing rib groups includes a third rib and a fourth rib with opposite protruding directions, the upper parts of which extend vertically, and the lower parts extend obliquely in opposite directions. The vertical sections of the two ribs are closely adjacent to each other, and the inclined sections of adjacent rib groups do not cross and have a short side spacing at the ends; The first heat exchange fin and the second heat exchange fin are stacked in a staggered manner, so that the first rib and the third rib are in contact and sealed, and the second rib and the fourth rib are in contact and sealed, forming heat channels and cold channels with heat exchange areas and diversion areas, and the heat channels and cold channels are arranged at intervals and alternately along the stacking direction; the air inlets of the heat channels and cold channels are located at the bottom edges of the heat exchange fins and are arranged at intervals along the length direction of the heat exchange fins, and the air outlets are located at the top edges of the heat exchange fins; drain outlets are formed at the short sides of the heat exchange fins.

2. The water collecting and fog dissipating packing unit according to claim 1, characterized in that, the heat channels include a left-inclined heat channel and a right-inclined heat channel arranged at intervals along the stacking direction. The air inlet of the left-inclined heat channel guides the humid hot air to the left and enters the corresponding heat exchange area through the diversion area of the channel. The air inlet of the right-inclined heat channel guides the humid hot air to the right and enters the corresponding heat exchange area through the diversion area of the channel; the cold channels include a left-inclined cold channel and a right-inclined cold channel arranged at intervals along the stacking direction. The air inlet of the left-inclined cold channel guides the dry cold air to the left and enters the corresponding heat exchange area through the diversion area of the channel. The air inlet of the right-inclined cold channel guides the dry cold air to the right and enters the corresponding heat exchange area through the diversion area of the channel; the projections of the heat exchange areas of the left-inclined heat channel and the right-inclined cold channel on the heat exchange fin stacking direction coincide and realize partition heat exchange; the projections of the heat exchange areas of the right-inclined heat channel and the left-inclined cold channel on the heat exchange fin stacking direction coincide and realize partition heat exchange.

3. The water collecting and fog dissipating packing unit according to claim 1, characterized in that, the heat exchange area is the area between the vertical sections of adjacent sealing rib groups; the diversion area is the area between the same-direction inclined sections of adjacent sealing rib groups.

4. The water collecting and fog dissipating packing unit according to claim 1, characterized in that, the heat channels are used to introduce the humid hot air obtained by exchanging heat between the circulating hot water and the dry cold air; the cold channels are used to introduce the dry cold air; the humid hot air in the heat channels and the dry cold air in the cold channels are subjected to partition heat exchange and then are respectively discharged from the top of the water collecting and fog dissipating packing unit and directly mixed.

5. The water collecting and fog dissipating packing unit according to claim 4, characterized in that, a diversion part is provided in the heat channels for guiding the condensed water formed after the humid hot air is heat-exchanged to the drain outlet.

6. The water collecting and fog dissipating packing unit according to claim 5, characterized in that, the diversion part includes: A vertical guide groove, which is arranged in the heat exchange area on the upper part of the heat exchange plate and is composed of vertically extending protrusions and / or depressions; The inclined guide groove is arranged in the guide area at the lower part of the heat exchange plate and is composed of obliquely extending protrusions and / or depressions. The inclined guide groove is arranged intermittently.

7. The water-absorbing and mist-eliminating packing unit according to claim 6, It is characterized in that The convex or concave directions of adjacent vertical guide grooves in the same heat exchange area are opposite; the convex or concave directions of adjacent inclined guide grooves with different inclined directions in the same guide area are opposite.

8. The water-absorbing and mist-eliminating packing unit according to claim 7, It is characterized in that The vertical guide grooves and the inclined guide grooves that overlap in the stacking direction of the adjacent first and second heat exchange fins have opposite protrusion directions.

9. The water-absorbing and mist-eliminating packing unit according to claim 1, It is characterized in that A water collecting tank is arranged at the liquid discharge port.

10. The water-absorbing and mist-eliminating packing unit according to claim 9, It is characterized in that The top sealing surface of the water collecting tank abuts against the drain port to form a cold and hot channel isolation at the drain port; the double grooves arranged on both sides of the water collecting tank are used to collect salt-containing spray droplets from the hot channel and condensed water formed after heat exchange.

11. The water-absorbing and mist-eliminating packing unit according to claim 1, It is characterized in that The first heat exchange fin and the second heat exchange fin are both long strip structures and have the same size.

12. The water-absorbing and mist-eliminating packing unit according to claim 4, It is characterized in that The tops of the first heat exchange plate and the second heat exchange plate are arranged horizontally to form hot channel air outlets and cold channel air outlets arranged at intervals along the stacking direction, so that the cold and hot air after heat exchange between the partitions are directly mixed at the air outlets.

13. A cooling tower, It is characterized in that A water-collecting and mist-eliminating filler unit as described in any one of claims 1 to 12 is used, and the water-collecting and mist-eliminating filler unit is arranged in the upper part of the cooling tower. A partition is vertically extended downward at each water collecting trough to form relatively independent hot and humid air channels and dry and cold air channels. The bottom end of the partition of the dry and cold air channel is provided with a damper that can be selectively opened.

14. The cooling tower according to claim 13, It is characterized in that The damper includes a rotating shaft and a rotating baffle that can rotate along the rotating shaft. Through the selective opening and closing of the damper, a water collection and mist elimination operation mode in winter and a thermal operation mode in summer are realized.

15. The cooling tower according to claim 13, It is characterized in that A spray unit is provided below the water collecting and mist dispelling filler unit, and a water sprinkling filler is provided below the spray unit; the circulating hot water from the spray unit contacts the dry cold air from the lower part of the cooling tower in reverse at the water sprinkling filler to obtain moist hot air.

16. The cooling tower according to claim 13, It is characterized in that Shutters are provided at corresponding positions of the dry and cold air passage, which are used to provide dry and cold air outside the tower to the dry and cold air passage in an operation mode in which the damper is closed.

17. The cooling tower according to claim 13, It is characterized in that The top of the cooling tower is provided with a wind tube and a fan inside the wind tube, which are used to provide power for the airflow running in the cooling tower.

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