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, the lower part of which extends to form a first inverted trapezoidal structure, the bevel edge of one side of the first inverted trapezoidal structure is provided with a first deflection part, and the bevel edge of the other side is provided with a first non-deflection part; a second inverted trapezoidal structure extends out of the lower part of the second heat exchange sheet, a second deflection part is arranged on the bevel edge of one side of the second inverted trapezoidal structure, and a second non-deflection part is arranged on the bevel edge of the other side of the second inverted trapezoidal structure; the arrangement positions of the first deflection part and the second deflection part are opposite; the first heat exchange pieces and the second heat exchange pieces are stacked in a staggered mode. The side edges of the upper portions of the stacked heat exchange pieces are sealed, the first deflection parts and the second non-deflection parts are connected in a sealed mode, and the second deflection parts and the first non-deflection parts are connected in a sealed mode, so that hot channels and cold channels which are arranged at intervals in a staggered mode are formed, and spaced hot channel air inlets are formed in the bevel edge of one side of the inverted trapezoidal structure. Spaced cold channel air inlets are formed in the bevel edge of the other side; and an opening structure formed at the short edge of the bottom of the inverted trapezoidal structure is used for draining liquid.

Description

Technical Field

[0001] The present invention relates to the technical field of circulating water cooling, and particularly relates to a water collection and demisting filler unit and a cooling tower applying the unit. Background Art

[0002] In industries such as petroleum and chemical industries, circulating water cooling systems are widely built. Traditional open cooling towers use splash packing to cool circulating water. The circulating hot water from the process unit enters the spray system of the cooling tower, and forms spray circulating hot water through the spray nozzles. The spray circulating hot water enters the splash packing from top to bottom. The packing is generally made of PVC sheets. Water enters the packing and forms a water film along the PVC sheets. The outside dry cold air enters the packing from bottom to top and exchanges heat with the water film. The water film evaporates and cools down, and the air is heated and humidified to form humid hot air. A fan is installed at the top of the cooling tower to discharge the humid hot air out of the tower, and the circulating hot water is cooled into circulating cold water. The humid hot air coming out from the upper part of the splash packing is discharged out of the tower through the cooling tower chimney. Since the humid hot air discharged out of the tower has high humidity and high temperature, when the environmental temperature is relatively low, the humid hot air discharged out of the tower mixes with the cold air, and a fog group containing many tiny liquid particle groups will be formed due to cooling and condensation. Therefore, there is a need for demisting.

[0003] For example, Chinese Patent Application CN103727805A discloses a deep condensate demisting and environmental protection device. The demisting and environmental protection device includes a tower body. Inside the tower body, there are successively arranged a packing, a water spraying device, a water collector, and a heat exchange device from bottom to top. 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 at the position between the heat exchange device and the air outlet inside the tower body. During operation, the hot circulating cooling water sprayed by the water spraying device is cooled by the cold air entering from the lower air inlet of the cooling tower in the packing, and the temperature of the circulating cooling water decreases; the cold air in the packing increases in temperature and moisture content, and forms 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, and exchanges 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 are 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 mutual cross-flow of cold air and hot air on both sides, full encapsulation installation is required, and the encapsulation and installation costs are relatively high; due to the installation of a water collector, the overall height of the tower body is relatively high; in addition, the condensate water with less salt in this type of solution cannot be effectively distinguished and recovered.

[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 the first air flow and the 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, and 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 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 this process is prone to gas-liquid entrainment.

[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 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 enhance the overall understanding of the present invention and should not be regarded as an admission or any form of suggestion that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Invention

[0007] The object of the present invention is to provide a water collection and fog elimination packing unit and a cooling tower using this unit. By arranging the first heat exchange fins and the second heat exchange fins in a staggered and stacked manner and the deflection parts oppositely arranged at the hypotenuse of the inverted trapezoidal structure, relatively independent cold and hot channels for partition heat exchange are constructed, which not only do not require a water collector but also can effectively improve the heat exchange efficiency.

[0008] Another object of the present invention is to provide a water collection and fog elimination packing unit and a cooling tower using this unit. By arranging the diversion protrusions and / or depressions inside the hot channel, a diversion facility for 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 packing unit, comprising: a first heat exchange fin, with a first inverted trapezoidal structure extending from its lower part, a first deflection part is provided on one inclined side of the first inverted trapezoidal structure, and a first non-deflection part is provided on the other inclined side; a second heat exchange fin, with a second inverted trapezoidal structure extending from its lower part, a second deflection part is provided on one inclined side of the second inverted trapezoidal structure, and a second non-deflection part is provided on the other inclined side; the positions of the first deflection part and the second deflection part are opposite; the first heat exchange fin and the second heat exchange fin are stacked in a staggered layer; through the edge sealing setting on the upper side of the heat exchange fins after stacking, and the sealed connection between the first deflection part and the second non-deflection part, and the second deflection part and the first non-deflection part, heat channels and cold channels arranged in an alternating and staggered manner are formed, and at one inclined side of the inverted trapezoidal structure, there are spaced heat channel air inlets, and at the other inclined side, there are spaced cold channel air inlets; the opening structure formed at the short side of the bottom of the inverted trapezoidal structure is used for liquid drainage.

[0010] Further, in the above technical solution, both the first deflection part and the second deflection part may have: an inclined surface, which deflects and extends obliquely along the base surface of the inverted trapezoidal structure, and is used for capturing and recovering the entrained salt-containing spray liquid droplets when the humid and hot air enters the heat channel air inlet; a sealed connection surface, which extends horizontally along the end of the inclined surface, and is used for sealing and fixing the first deflection part and the second non-deflection part, and the second deflection part and the first non-deflection part.

[0011] Further, in the above technical solution, the heat channel is used for introducing the humid and hot air obtained by heat exchange between the circulating hot water and the dry cold air; the cold channel is used for introducing dry cold air; after the humid and hot air in the heat channel and the dry cold air in the cold channel perform wall-to-wall heat exchange, they can be discharged from the top of the water collection and fog elimination packing unit respectively and directly mixed.

[0012] 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 opening structure may be provided in the heat channel. The diversion part may include: a vertical diversion groove, which is arranged on the upper part of the heat exchange fin and is composed of a vertically extending protrusion and / or depression; an inclined diversion groove, which is arranged on the inverted trapezoidal structure part of the heat exchange fin and is composed of an obliquely extending protrusion and / or depression, and the inclined diversion groove is arranged intermittently.

[0013] Further, in the above technical solution, a water collection tank may be provided at the opening structure formed by the short side of the bottom of the inverted trapezoidal structure. The water collection tank preferably abuts against the opening structure to form a liquid collection outlet communicating with the heat channel and a liquid seal opening communicating with the cold channel, and the liquid seal opening can isolate the cold and heat channels at the liquid drainage place.

[0014] Further, in the above technical solution, the water collection tank may be provided with a spray liquid droplet collection and collection area on the outside and a condensed water collection and collection area on the inside.

[0015] Furthermore, in the above technical solution, the upper parts of the first heat exchange fin and the second heat exchange fin may be rectangular structures.

[0016] Furthermore, in the above technical solution, the tops of the first heat exchange plate and the second heat exchange plate can be arranged horizontally, and after stacking, hot channel air outlets and cold channel air outlets are formed at intervals, so that the cold and hot air after heat exchange in the partition wall are directly mixed at the air outlet.

[0017] According to the second aspect of the present invention, there is provided a cooling tower, using any one of the aforementioned water-collecting and mist-dispelling packing units, wherein there are a plurality of water-collecting and mist-dispelling packing units, which are arranged side by side in the upper part of the cooling tower to construct a packing assembly, and a partition is vertically extended downward from the water collecting trough of each water-collecting and mist-dispelling packing unit to form a relatively independent hot and humid air channel and a dry and cold air channel, and a damper that can be selectively opened is provided at the bottom end of the partition of the dry and cold air channel.

[0018] Furthermore, in the above technical solution, the damper may include a rotating shaft and a rotating baffle that can rotate along the rotating shaft. Through the selective opening and closing of the damper, the water collection and mist removal operation mode in winter and the thermal operation mode in summer can be realized.

[0019] Furthermore, in the above technical solution, a spray unit is provided below the filler assembly, and a water spray filler is provided below the spray unit; the circulating hot water from the spray unit contacts the dry cold air from the bottom of the cooling tower in reverse at the water spray filler to obtain moist hot air.

[0020] 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.

[0021] 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.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1) The present invention can construct relatively independent cold and hot channels that can perform inter-wall heat exchange by staggered stacking of the first heat exchanger plate and the second heat exchanger plate and the deflection parts relatively arranged at the oblique sides of the inverted trapezoidal structure, which not only eliminates the need for a water collector, saves cooling tower space, but also effectively improves heat exchange efficiency. The inlets of cold and hot air are respectively located at the oblique sides of the inverted trapezoidal structure, and the drain port is located at the short side of the bottom of the inverted trapezoidal structure, which not only completely separates the inlets of the hot channel and the cold channel, but also avoids interference between the gas and liquid phases to the greatest extent;

[0024] 2) The hot channel of the water collection and demisting packing unit of the present invention is used to introduce the humid hot air obtained by exchanging heat between circulating hot water and dry cold air. The cold channel is used to introduce dry cold air. After the humid hot air in the hot channel and the dry cold air in the cold channel exchange heat through the partition wall, they can be discharged separately from the top of the water collection and demisting packing unit of the present invention and directly mixed without providing a mixing space, which can further save the use space of the cooling tower;

[0025] 3) Through the structural design at the hypotenuse of the inverted trapezoidal structure of the water collection and demisting packing unit of the present invention, not only staggered cold and hot channel inlets are constructed, but also when the humid hot air passes through the hot channel inlet, under the action of the deflection part, the air flow can turn twice. During the turning process, due to inertia, the liquid droplets entrained in the air flow have a large turning radius and cannot follow the air flow to turn, so they are captured and collected twice. Therefore, at the air inlet of the hot channel, the present invention can remove most of the salt-containing liquid droplets entrained in the humid hot air flow. This part of the salt-containing liquid droplets can be directly guided to the water collection tank arranged at the short side of the bottom of the inverted trapezoidal structure at the air inlet of the hot channel and can be collected separately;

[0026] 4) The vertical diversion grooves in the hot channel of the water collection and demisting packing unit of the present invention can capture a small part of the salt-containing liquid droplets entrained in the humid hot air and most of the condensed water (salt-free) in the hot channel after heat exchange through the partition wall (at this time, most of the salt-containing liquid droplets have been captured at the air inlet of the hot channel), and guide them through the inclined diversion grooves to the water collection tank arranged at the opening structure at the short side of the bottom of the inverted trapezoidal structure, and can also be collected separately, thus effectively reducing the liquid droplet entrainment of the humid hot air flow and enhancing the water collection and demisting ability. Through the unique two-stage entrained droplet series capture structure of the invention (i.e., the deflection part at the air inlet of the hot channel and the diversion part in the hot channel), more than 95% of the entrained liquid can be removed, and the removal rate of entrained droplets above 20μm is close to 100%, and both the salt-containing spray liquid droplets and the salt-free condensed water can be collected separately;

[0027] 5) For the cooling tower of the present invention, since the packing layer composed of the water collection and demisting packing units applied has a remarkable water collection function, the cooling tower can cancel the setting of the traditional water collector, making the rotation space of the air damper sufficient. 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;

[0028] 6) Since the humid hot air and the dry cold air enter the channels inside the packing unit through the air inlets on both sides of the inverted trapezoidal structure respectively, when the air initially enters the packing unit, due to the mutual interval of the cold and hot channels, the actual inlet area on the side of the inverted trapezoidal structure area is reduced by half, and the initial wind speed entering the packing layer is equivalent to 1.4 times the wind speed of the tower cross-section. When passing through the cold and hot channels and entering the rectangular structure of the packing unit, the gas flow rate is reduced to the same as the wind speed of the tower cross-section, so that 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;

[0029] 7) The cooling tower of the present invention can have two modes of operation: water collection and fog elimination operation and thermal operation, which can be respectively applied to the requirements of different seasons and have the characteristic of flexible operation.

[0030] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and be able to implement it according to the content of the specification, and at the same time to make the above and other objects, 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

[0031] Figure 1 It is a schematic structural diagram of the first heat exchange fin in the water collection and fog elimination packing unit of the present invention.

[0032] Figure 2 It is a schematic structural diagram of the second heat exchange fin in the water collection and fog elimination packing unit of the present invention.

[0033] Figure 3 It is a schematic structural diagram of the flow guiding part on the heat exchange fin of the present invention.

[0034] Figure 4 It is a schematic diagram after the first and second heat exchange fins in the water collection and fog elimination packing unit of the present invention are stacked in a staggered manner Figure 1 .

[0035] Figure 5 It is a schematic diagram after the first and second heat exchange fins in the water collection and fog elimination packing unit of the present invention are stacked in a staggered manner Figure 2 .

[0036] Figure 6 It is a schematic diagram after the first and second heat exchange fins in the water collection and fog elimination packing unit of the present invention are stacked in a staggered manner Figure 3 .

[0037] Figure 7 It is a schematic diagram of the installation position of the water collection tank in the water collection and fog elimination packing unit of the present invention (showing the first embodiment of the water collection tank).

[0038] Figure 8 It is a schematic diagram of the second embodiment of the water collection tank in the water collection and fog elimination packing unit of the present invention.

[0039] Figure 9 It is a schematic diagram of water collection at the deflection part in the water collection and fog elimination packing unit of the present invention.

[0040] Figure 10 It is a schematic diagram of the internal structure of the cooling tower of the present invention.

[0041] Main reference numeral description:

[0042] 1 - First heat exchange fin, 11 - First rectangular structure, 110 - First side, 12 - First inverted trapezoidal structure, 121 - First deflected portion, 1211 - Inclined surface, 1212 - Sealed connection surface, 122 - First non - deflected portion, 123 - First trapezoidal short side, 2 - Second heat exchange fin, 21 - Second rectangular structure, 210 - Second side, 22 - Second inverted trapezoidal structure, 221 - Second deflected portion, 222 - Second non - deflected portion, 223 - Second trapezoidal short side, 3 - Flow - guiding portion, 31 - Vertical flow - guiding protrusion, 32 - Vertical flow - guiding depression, 33 - Inclined flow - guiding protrusion, 34 - Inclined flow - guiding depression, 4 - Stacked packing units, 40 - Side sealing edge, 41 - Hot - channel air outlet, 42 - Cold - channel air outlet, 43 - Hot - channel air inlet, 44 - Liquid collection outlet, 45 - Liquid sealing opening, 46 - Cold - channel air inlet, 5 - Water collection trough, 51 - Spray droplet liquid collection area, 52 - Condensate liquid collection area, 6 - Partition board, 7 - Air damper, 8 - Humid - hot air channel, 9 - Dry - cold air channel;

[0043] 100 - Cooling tower, 101 - Spray unit, 102 - Splash - type packing, 103 - Louver, 104 - Chimney, 105 - Fan. Detailed implementation manners

[0044] The following combines with the attached drawings to describe in detail the specific implementation manners of the present invention. However, it should be understood that the protection scope of the present invention is not limited by the specific implementation manners.

[0045] Unless otherwise clearly stated, in the whole specification and claims, the term "comprise" or its variations such as "comprises" or "including" etc. will be understood to include the stated elements or components, without excluding other elements or other components.

[0046] In this article, for the convenience of description, spatial relative terms such as "below", "beneath", "under", "above", "over", "on" etc. can be used to describe the relationship between one element or feature and another element or feature in the attached drawings. It should be understood that the spatial relative terms are intended to cover different directions of the object in use or operation in addition to the directions shown in the drawings. For example, if the object in the drawing is flipped, the element described as "below" or "under" another element or feature will be oriented "above" the said element or feature. Therefore, the exemplary term "below" can include both the lower and upper directions. The object can also have other orientations (rotated 90 degrees or other orientations) and the corresponding explanations should be made for the spatial relative terms used herein.

[0047] In this text, terms such as "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, terms such as "first", "second", etc. can also be interchanged with each other.

[0048] Example 1

[0049] As Figures 1 to 6 shown, this embodiment provides a water collection and fog elimination filler unit, which at least includes a first heat exchange fin 1 and a second heat exchange fin 2. Among them, the upper part of the first heat exchange fin 1 can be a rectangular structure 11, and the lower part extends out a first inverted trapezoidal structure 12. One inclined side of the first inverted trapezoidal structure 12 is provided with a first deflected part 121 (i.e., Figure 1 the left side in Figure 1 ), and the other inclined side is provided with a first non-deflected part 122 (refer to 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. The upper part is a rectangular structure 21, and the lower part extends out a second inverted trapezoidal structure 22. One inclined side of the second inverted trapezoidal structure 22 is provided with a second deflected part 221 (i.e., Figures 4 to 6 the right side in

[0050] Figure 2 ), and the other inclined side is provided with a second non-deflected part 222. The installation positions of the first deflected part 121 and the second deflected part 221 are opposite. Further as Figures 4 to 6 shown, the first heat exchange fin 1 and the second heat exchange fin 2 are stacked in a staggered manner (i.e., assembled into a stacked filler unit 4); through the edge sealing arrangement on the upper side edges of the heat exchange fins after stacking (i.e., forming a side seal 40), and the sealed connection between the first deflected part 121 and the second non-deflected part 222, and the second deflected part 221 and the first non-deflected part 122, heat channels and cold channels arranged in an interval and staggered manner are formed. One inclined side of the inverted trapezoidal structure is an interval heat channel air inlet 43, and the other inclined side is an interval cold channel air inlet 46; the opening structure formed at the bottom short side of the inverted trapezoidal structure is used for liquid drainage. Preferably but not limitedly, the tops of the first heat exchange fin 1 and the second heat exchange fin 2 are both horizontally arranged. After the heat exchange fins are stacked and assembled, heat channel air outlets 41 and cold channel air outlets 42 arranged at intervals can be formed. Through such an arrangement, the cold and hot air after partition heat exchange are directly mixed at the air outlets.

[0050] In this embodiment, through the staggered stacking of the first heat exchange fin and the second heat exchange fin and the deflected portions arranged opposite to each other at the hypotenuse of the inverted trapezoidal structure, cold and hot channels that are relatively independent and can conduct partition heat exchange can be constructed. Not only does it not require the use of a water collector, saving the space of the cooling tower, but it can also effectively improve the heat exchange efficiency. Moreover, the inlets of the cold and hot air are respectively located at the two hypotenuse sides of the inverted trapezoidal structure, and the liquid discharge port is located at the bottom short side of the inverted trapezoidal structure. This not only completely separates the inlets of the hot channel and the cold channel, but also maximally avoids interference between the gas-liquid two phases. The hot channel in 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 (i.e., the atmosphere in winter). After the humid hot air in the hot channel and the dry cold air in the cold channel conduct partition heat exchange, they are respectively discharged from the top of the water collection and demisting filler unit of the present invention and directly mixed, without the need to provide a mixing space, which can further save the use space of the cooling tower.

[0051] Further combined with Figure 5 、 6 、as shown in 9, both the first deflected portion 121 and the second deflected portion 221 in this embodiment have an inclined surface and a sealed connection surface. Taking the first deflected portion 121 as an example, its inclined surface 1211 deflects along the base surface of the inverted trapezoidal structure and extends obliquely, which is used to capture and recover the salt-containing spray droplets entrained when the humid hot air enters the air inlet 43 of the hot channel. Its sealed connection surface 1212 extends horizontally along the end of the inclined surface 1211 and is used to seal and fix the first deflected portion 121 and the second non-deflected portion 222 (preferably by bonding). Similarly, the second deflected portion 221 and the first non-deflected portion 122 at the other hypotenuse side of the inverted trapezoidal structure are sealed and fixed in the same way.

[0052] Through the above structural design at the hypotenuse of the inverted trapezoidal structure, not only the inlets of the cold and hot channels with staggered settings are constructed, but also when the humid hot air passes through the air inlet of the hot channel, under the action of the first deflected portion 121, the humid hot air deflects, bypasses the first deflected portion, and then enters the hot channel in the water collection and demisting filler unit. During this process, the air flow turns twice. The first time it avoids the first deflected portion 121, and the droplets entrained in the air flow (i.e., Figure 9 the salt-containing spray droplets) due to inertia have a large turning radius and cannot follow the air flow to turn, so they hit the inclined surface 1211 of the first deflected portion 121 and are captured by the first deflected portion 121. After the air flow avoids the inclined surface 1211 of the first deflected portion, it turns again and enters the hot channel in the water collection and demisting filler unit. During this process, the droplets entrained in the air flow (i.e., Figure 9The salt-containing spray droplets (in the heat transfer fins) have a large turning radius due to inertia and cannot follow the airflow to turn, but hit the non-deflected part of the heat transfer fins and are captured again by the non-deflected part of the heat transfer fins. Therefore, at the air inlet of the hot channel, most of the salt-containing droplets entrained by the humid and hot airflow can be removed in this embodiment, and these salt-containing droplets can be directly guided to the opening structure at the short side of the bottom of the inverted trapezoidal structure at the air inlet of the hot channel.

[0053] Furthermore, as Figure 3 shown, a diversion part 3 is provided in the hot channel for diverting the condensed water (i.e., salt-free condensed water precipitated from the humid and hot air) formed after heat exchange of the humid and hot air to the aforementioned opening structure. It should be noted here that such a structure can also be provided in the cold channel. Although condensed water will not be formed in the cold channel when dry cold air is introduced in winter, in the thermal operation mode in summer, humid and hot air can also be introduced into the cold channel. At this time, in order to facilitate the collection of condensed water, the diversion part 3 can also be provided in the cold channel. Furthermore, as Figure 3 shown, the diversion part 3 can include a vertical diversion groove and / or an inclined diversion groove. Among them, the vertical diversion groove is arranged at the rectangular structure on the upper part of the heat transfer fins and is composed of a vertically extending vertical diversion protrusion 31 and / or a vertical diversion depression 32. The inclined diversion groove is arranged at the inverted trapezoidal structure part of the heat transfer fins and is composed of an inclinedly extending inclined diversion protrusion 33 and / or an inclined diversion depression 34. The inclined diversion groove is preferably arranged intermittently (a flow channel for condensed water can be formed at the intermittent part).

[0054] The above-mentioned vertical diversion groove in this embodiment can capture a small part of the salt-containing droplets entrained by the humid and hot air and most of the condensed water (salt-free) in the hot channel after heat exchange through the partition wall (at this time, most of the salt-containing droplets have been captured at the air inlet of the hot channel), and guide them to the opening structure at the short side of the bottom of the inverted trapezoidal structure through the inclined diversion groove, so as to effectively reduce the droplet entrainment of the humid and hot airflow and enhance the water collection and fog elimination ability. Through the unique two-stage entrained droplet series capture structure (i.e., the deflected part at the air inlet of the hot channel and the diversion part in the hot channel) of this embodiment, more than 95% of the entrained liquid can be removed, and the removal rate of entrained droplets above 20μm is close to 100%.

[0055] Furthermore, as Figures 5 to 8As shown, a water collecting trough 5 is provided at the opening structure formed by the short side at the bottom of the inverted trapezoidal structure. Preferably but not restrictively, the water collecting trough 5 abuts against the opening structure to form a liquid collecting outlet 44 communicating with the hot channel and a liquid sealing port 45 communicating with the cold channel. By providing the liquid sealing port 45, the hot and cold channels can be effectively isolated at the liquid discharge location. The short side opening (which can also be set as a semi-opening structure) at the bottom of the inverted trapezoidal structure in this embodiment is horizontally arranged, which can separate the air inlet and the liquid discharge port, reducing the entrainment caused by gas-liquid countercurrent in the prior art; by abutting the opening or semi-opening structure against the water collecting trough 5, not only can the weight of the entire water collecting and demisting packing unit be better supported without deformation, but also the liquid collecting outlet 44 and the liquid sealing port 45 can be constructed (refer to Figure 5 , 6 ). The deflector and the vertical and inclined diversion grooves provided inside the water collecting and demisting packing unit can effectively recover the salt-containing spray droplets carried by the humid hot gas and the salt-free condensed water precipitated from the humid hot gas respectively, and divert them into the water collecting trough 5. During operation, when the liquid level height of the water in the water collecting trough 5 exceeds the edge of the short side at the bottom of the inverted trapezoidal structure, effective isolation of the cold and hot airflows can be achieved. Further, preferably but not restrictively, in order to separately collect the salt-containing spray droplets and the salt-free condensed water, the water collecting trough 5 in this embodiment also provides another implementation manner (refer to Figure 8 ), that is, the water collecting trough 5 is provided with a spray droplet liquid collecting area 51 located on the outside and a condensed water liquid collecting area 52 located on the inside. By adopting this implementation manner, correspondingly, a salt-containing liquid droplet diversion facility (not shown in the figure) can be added at the corresponding position at the air inlet of the hot channel, so as to directly guide the salt-containing spray droplets to the spray droplet liquid collecting area 51, while the salt-free or low-salt condensed water collected by the condensed water liquid collecting area 52 can be used for other purposes, saving costs.

[0056] Example 2

[0057] As Figure 10 shown, this embodiment provides a cooling tower 100, which applies the water collecting and demisting packing unit (that is, the packing unit 4 after stacking heat exchange fins) as described in the foregoing embodiment 1. The number of water collecting and demisting packing units 4 is multiple, and they are arranged side by side in the upper part of the cooling tower 100 to construct a packing assembly. A partition 6 is vertically extended downward at the water collecting trough 5 of each water collecting and demisting packing unit to form relatively independent humid hot air channels 8 and dry cold air channels 9. A wind door 7 that can be selectively opened is provided at the bottom end of the partition of the dry cold air channel 9. Further, the wind door 7 can include a rotating shaft and a rotating baffle that can rotate along the rotating shaft. By selectively opening and closing the wind door 7, the water collecting and demisting operation mode in winter and the thermal operation mode in summer can be realized. Further as Figure 10As shown, a spray unit 101 is provided below the filler assembly, and a water spray filler 102 is provided below the spray unit 101. The circulating hot water from the spray unit 101 contacts the dry cold air from the lower part of the cooling tower 100 in reverse at the water spray filler 102, thereby obtaining the wet hot air entering the hot channel in the above-mentioned embodiment 1. Figure 10 As shown, shutters 103 are provided at corresponding positions of the dry cold air passage, which are used to provide dry cold air outside the tower to the dry cold air passage in the operation mode of closing the damper. A wind tube 104 and a fan 105 in the wind tube are provided at the top of the cooling tower 100, which are used to provide power for the airflow running in the cooling tower.

[0058] In the cooling tower of this embodiment, since the packing layer composed of the water collecting and mist dispelling packing unit has a significant water collecting function, the cooling tower can cancel the setting of the traditional water collector, so that the rotation space of the damper is sufficient, and the height of the whole tower can be reduced by 1-2 meters compared with the conventional technology, which can significantly reduce the equipment cost; since the humid hot air and the dry cold air enter the channel of the packing unit through the air inlets on both sides of the inverted trapezoidal structure respectively. When the air initially enters the packing unit, due to the spacing between the cold and hot channels, the actual inlet area on the side of the inverted trapezoidal structure area is reduced by half, and the initial wind speed entering the packing layer is equivalent to 1.4 times the wind speed of the tower cross section. When entering the rectangular structure of the packing unit through the cold and hot channels, the gas flow rate is reduced to the same as the wind speed of the tower cross section, so that the pressure drop of the packing layer constructed by the water collecting and mist dispelling packing unit is only about 50% of that of the conventional technology; since the cold and hot channels of the packing unit are arranged at intervals, the air can be quickly and evenly mixed after leaving the packing layer through the cold and hot channel outlets at the top, so that no additional mixing space is required at the top of the cooling tower, and the height of the tower body can be further reduced.

[0059] The cooling tower of this embodiment can have two operation modes: a water collection and mist elimination operation mode and a thermal operation mode. Specifically, by setting the rotating baffle of the damper 7, in summer, the rotating baffle of the damper 7 is in a vertical position, at this time, the shutter 103 is closed, and the hot and humid air can be discharged from the cooling tower 100 through the cold and hot channels of the water collection and mist elimination packing unit 4 at the same time, which is a thermal operation mode; in winter, the rotating baffle of the damper is in a horizontal position (that is, the damper is closed), at this time, the shutter 103 is opened, and the dry and cold air from the shutter enters the cold channel of the packing unit 4 through the dry and cold air channel 9, and the humid and hot air enters the hot channel of the packing unit 4 through the humid and hot air channel 8, which is a water collection and mist elimination operation mode. It can be applied to the needs of different seasons respectively, and has the characteristics of flexible operation.

[0060] The following is a detailed description of the cooling tower's water collection and mist elimination process (refer to Figures 1 to 10 ):

[0061] 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 inlet 46; 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 inlet 43 of the water collection and demisting filler unit 4. Under the action of the first deflection part 121 at the hot channel air inlet 43, the humid and hot air deflects. In 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. Most of the salt-containing droplets entrained by the humid and hot air flow are removed here. The captured salt-containing spray droplets can be separately guided to the spray droplet collection area 51 of the water collection tank 5; the humid and hot air removing the entrained salt-containing spray droplets further enters the interior of the hot channel of the water collection and demisting filler 4, and exchanges heat through the partition wall with the dry and cold air entering the cold channel through the cold channel air inlet 46, 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 the condensed water is guided by the inclined diversion groove in the inverted trapezoidal structure and enters the rectangular structure at the upper part of the water collection and demisting filler unit 4, and turns during this process. The condensed water entrained by the humid and hot air has different densities and large differences in inertial forces. Due to inertia, it strikes the protrusion of the vertical diversion groove, and the condensed water droplets entrained by the humid and hot air are captured by the vertical diversion groove. The condensed water droplets attached to and captured by the heat exchange fins inside the hot channel flow along the vertical diversion groove and the inclined diversion groove under the action of gravity, and flow downward at the discontinuous part of the inclined diversion groove, and further enter the condensed water collection area 52 of the water collection tank 5. Since the condensed water does not contain salt or is in a low-salt state, by separately collecting it from the salt-containing spray droplets, it can be further recycled; after the cold and hot air flows in the filler layer constructed by the water collection and demisting filler unit 4 exchange heat, 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 layer and mix to become unsaturated air, and then are discharged outside the tower through the fan 105 to achieve the purpose of water collection and demisting.

[0062] The foregoing description of the specific exemplary embodiments of the present invention is for the 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 modifications, equivalent changes and modifications made to the above exemplary embodiments shall fall within the protection scope of the present invention.

Claims

1. A water collecting and demisting packing unit, characterized in that, it includes: A first heat exchange fin, with a first inverted trapezoidal structure extending from its lower part. One slant side of the first inverted trapezoidal structure is provided with a first deflected part, and the other slant side is provided with a first non - deflected part; A second heat exchange fin, with a second inverted trapezoidal structure extending from its lower part. One slant side of the second inverted trapezoidal structure is provided with a second deflected part, and the other slant side is provided with a second non - deflected part; the setting positions of the first deflected part and the second deflected part are opposite; The first heat exchange fin and the second heat exchange fin are stacked in a staggered layer arrangement; through the edge sealing setting of the upper side of the heat exchange fins after stacking, and the sealed connection of the first deflected part and the second non - deflected part, and the second deflected part and the first non - deflected part, heat channels and cold channels arranged in an alternating and staggered manner are formed. And at one slant side of the inverted trapezoidal structure, there are spaced heat channel air inlets, and at the other slant side, there are spaced cold channel air inlets; the opening structure formed at the short bottom side of the inverted trapezoidal structure is used for draining liquid.

2. The water collecting and demisting packing unit according to claim 1, characterized in that, Both the first deflected part and the second deflected part have: An inclined surface, which deflects and extends along the base surface of the inverted trapezoidal structure, and is used for capturing and recovering the entrained salt - containing spray liquid droplets when the humid and hot air enters the heat channel air inlet; A sealed connection surface, which extends horizontally along the end of the inclined surface, and is used for sealing and fixing the first deflected part and the second non - deflected part, and the second deflected part and the first non - deflected part.

3. The water collecting and demisting packing unit according to claim 1, characterized in that, The heat channel is used for introducing the humid and hot air obtained after heat exchange between the circulating hot water and the dry cold air; the cold channel is used for introducing dry cold air; the humid and hot air in the heat channel and the dry cold air in the cold channel are subjected to partition heat exchange and then are respectively discharged from the top of the water collecting and demisting packing unit and directly mixed.

4. The water collecting and demisting packing unit according to claim 3, characterized in that, A diversion part is provided in the heat channel for guiding the condensed water formed after heat exchange of the humid and hot air to the opening structure.

5. The water collecting and demisting packing unit according to claim 4, characterized in that, The diversion part includes: Vertical diversion grooves, which are arranged on the upper part of the heat exchange fin and are composed of vertically extending protrusions and / or depressions; Inclined diversion grooves, which are arranged on the inverted trapezoidal structure part of the heat exchange fin and are composed of inclinedly extending protrusions and / or depressions, and the inclined diversion grooves are arranged intermittently.

6. The water collecting and demisting packing unit according to claim 1, characterized in that, A water collecting tank is arranged at the opening structure formed by the short bottom side of the inverted trapezoidal structure.

7. The water collecting and demisting packing unit according to claim 6, characterized in that, The water collecting tank abuts against the opening structure to form a liquid collecting outlet communicating with the heat channel and a liquid sealing opening communicating with the cold channel, and the liquid sealing opening isolates the cold and heat channels at the liquid drainage place.

8. The water collecting and demisting packing unit according to claim 7, characterized in that, The water collecting tank is provided with a spray liquid droplet collecting area on the outside and a condensed water collecting area on the inside.

9. The water collecting and demisting packing unit according to claim 1, characterized in that, The upper parts of the first heat exchange fin and the second heat exchange fin are rectangular structures.

10. The water collecting and demisting packing unit according to claim 9, characterized in that, the tops of the first heat exchange fin and the second heat exchange fin are horizontally arranged, and after being stacked, a heat channel air outlet and a cold channel air outlet which are arranged at intervals are formed, so that the cold and hot air after partition heat exchange are directly mixed at the air outlet.

11. A cooling tower, characterized in that, it applies the water collecting and demisting packing unit according to any one of claims 1 to 10. The number of the water collecting and demisting packing units is multiple, and they are arranged side by side in the upper part of the cooling tower to construct a packing assembly. A partition board is vertically extended downward at the water collecting tank of each water collecting and demisting packing unit to form relatively independent wet and hot air channels and dry and cold air channels. A wind door which can be selectively opened is arranged at the bottom end of the partition board of the dry and cold air channel.

12. The cooling tower according to claim 11, characterized in that, the wind door includes a rotating shaft and a rotating baffle which 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 are realized.

13. The cooling tower according to claim 11, characterized in that, a spraying unit is arranged below the packing assembly, 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.

14. The cooling tower according to claim 11, characterized in that, louver windows are arranged 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 wind door is closed.

15. The cooling tower according to claim 11, characterized in that, a wind cylinder and a fan in the wind cylinder are arranged at the top of the cooling tower to provide power for the air flow operating in the cooling tower.

Images