A cross-flow mist-eliminating water-saving cooling tower

Abstract

The present invention provides a cross-flow defogging and water-saving cooling tower, which relates to the field of cooling equipment; its structure includes a cooling tower body, a first cooling system arranged on the side of the tower body, a water collector arranged inside the tower body, a spray assembly, a spray assembly, a filler, a water collection tank, a shutter, and connected pipe valves, etc. The first cooling system is composed of an axial flow fan, a partition heat exchanger, a water distribution system, a shutter, and a water collection tank; the present invention combines the three types of the first cooling system, the spray tower, and the packing tower, and makes full use of the characteristics of the three cooling types, combining air cooling and wet cooling, and switching different cooling and heat exchange modes according to changes in the external environment temperature, thereby achieving the purpose of defogging, water saving, and energy saving throughout the year. Compared with others, this technology has the advantages of simple structure, low cost, simple operation, and long service life.

Description

Technical Field

[0001] The invention relates to the field of cooling equipment, in particular to a cross-flow type mist-eliminating and water-saving cooling tower. Background Art

[0002] In recent years, with the rapid development of my country's industry, my country's economy has achieved remarkable achievements, but also accompanied by huge environmental pollution problems, "white mist" pollution is one of them. In particular, the "white mist" pollution phenomenon of open cooling towers in major chemical industries has attracted the attention of the government.

[0003] The formation principle of "white mist" in the cooling tower is: the saturated airflow in the cooling tower leaves the cooling tower driven by the operation of the fan. When the external temperature of the cooling tower is low, the saturated airflow condenses when it encounters cold to form white mist. The formation principle is the same as the fog formed when people breathe in winter. White mist is not only a carrier of PM2.5, but also wastes a lot of water resources, making enterprises face huge environmental pressure and water shortage pressure.

[0004] At present, the commonly used defogging and water-saving open cooling towers on the market are mainly external fin defogging and water-saving cooling towers and built-in defogging module defogging and water-saving cooling towers, but both have certain defects. As we all know, finned tubes have the disadvantages of easy clogging, corrosion, and scaling due to the small fin gap. In order to prevent scaling in the tube and affect the heat exchange effect, it has high requirements for the quality of circulating water. The circulating water quality of open cooling towers is relatively poor, which makes the external fin defogging and water-saving cooling towers very prone to clogging, corrosion, scaling, etc., which greatly reduces its defogging and water-saving effect and the service life of the cooling tower.

[0005] Compared with the external fin type defogging and water-saving cooling tower, the defogging and water-saving effect of the built-in defogging module type defogging and water-saving cooling tower is poor, and the service life of the defogging module in the tower is relatively long. However, the area of ​​the defogging module placed in the tower is limited. When the ambient temperature is below 0℃, there is basically no defogging effect. When the ambient temperature is lower, ice is likely to form in the tower, making its defogging and water-saving functions ineffective.

[0006] The above two technologies cannot solve the "white fog" problem of open cooling towers very well. The present invention adopts an innovative partition wall heat exchanger design, combines the advantages of packing towers and spray towers, and designs a new type of defogging and water-saving cooling tower, which can ensure that the year-round defogging and water-saving operation can be achieved under the premise of meeting the circulating water temperature reduction requirements. Summary of the invention

[0007] The invention provides a cross-flow defogging water-saving cooling tower, aiming to improve the technical problem that the existing external fin type defogging water-saving cooling tower is very prone to blockage, corrosion, scaling and the like, thereby greatly reducing its defogging and water-saving effect.

[0008] A cross-flow mist-eliminating and water-saving cooling tower comprises a tower body, a water collecting tank is arranged at the bottom of the tower body, a first cooling system is installed on the inner or outer side of the tower body side wall, the first cooling system comprises a partition-type heat exchanger, a first spray assembly installed on the upper part of the partition-type heat exchanger and a first air inlet channel arranged on the outer side of the partition-type heat exchanger; a cross-flow filler is installed directly below the first cooling system.

[0009] Preferably, the water inlet of the first spray assembly is connected to the water inlet pipe through a first branch pipe, and a valve A is installed on the first branch pipe.

[0010] Preferably, a second spray assembly is further provided in the tower body, and the second spray assembly is arranged directly above the cross-flow filler.

[0011] Preferably, the second spray assembly is connected to the water inlet pipe via a second branch pipe, and a valve B is installed on the second branch pipe.

[0012] Preferably, a second air inlet channel is provided on the outer side of the cross-flow filler.

[0013] Preferably, the second air inlet passage is a lower shutter, and the opening of the lower shutter is adjustable.

[0014] Preferably, a water collector is further provided inside the tower body, and the installation height of the water collector is located between the second spray assembly and the partition wall heat exchanger.

[0015] Preferably, a spray assembly is further provided in the tower body, and the spray assembly is located directly below the water collector. The water inlet of the spray assembly is connected to the water inlet pipe through a third pipe, and a valve C is installed on the third pipe.

[0016] Preferably, the partition-type heat exchanger is a plate-type heat exchanger, and the plate-type heat exchanger includes heat exchange channels which are formed by a plurality of plate-shaped heat exchange membranes arranged and combined and are not interconnected.

[0017] Preferably, the heat exchange channel comprises a cold air channel and a hot water channel, and the cold air channel and the hot water channel are arranged at intervals.

[0018] Preferably, the heat exchange membrane of the plate heat exchanger is a straight plate or an S-shaped plate.

[0019] Preferably, the partition wall heat exchanger is a tubular heat exchanger.

[0020] Preferably, the heat exchange tubes of the tubular heat exchanger are in the shape of round tubes, elliptical tubes or corrugated tubes.

[0021] Preferably, the first air inlet passage is a shutter, which is installed on the outside of the partition wall heat exchanger, and the opening of the shutter is adjustable.

[0022] Preferably, an axial flow fan for sucking external air into the interior of the partition-type heat exchanger is installed on the outside or inside of the shutter.

[0023] Preferably, a fan for extracting hot air from the tower body is provided at the top of the tower body.

[0024] Beneficial effects:

[0025] The present invention can switch to different cooling and heat exchange modes according to the change of the external environment temperature, thereby achieving year-round defogging, water saving and energy saving;

[0026] When the ambient temperature is high, only the second spray assembly and the spray assembly are in operation, that is, valve A on the first branch pipe is closed, the shutters of the first air inlet channel are closed, valve B on the second branch pipe and valve C on the third branch pipe are opened, and the lower shutters are opened; the circulating water falls on the cross-flow filler through the second branch pipe and the second spray assembly, and the air volume all enters through the lower shutters and directly contacts the water on the cross-flow filler, taking away the heat, and the wind temperature rises in this process; at the same time, the circulating water is sprayed out through the spray nozzle of the third branch pipe, and the wind passing through the cross-flow filler enters the lower air chamber, and the wind temperature out of the cross-flow filler is lower than the water temperature of the spray assembly. The two are in contact and heat exchange in the lower air chamber below the water collector, and the wind temperature further rises, so that the circulating water meets the temperature drop. This cooling mode includes two heat exchanges of cross-flow material spraying and spraying;

[0027] When the ambient temperature is low, the first cooling system and the spray system operate jointly, that is, the valve A on the first branch pipe is opened, the shutter of the first air inlet channel is opened, the valve B on the second branch pipe is opened, the valve C on the third branch pipe is closed, and the lower shutter is opened; the circulating water falls into the partition heat exchanger through the first branch pipe and the first spray assembly, and a part of the wind enters the partition heat exchanger through the shutter of the first cooling system to exchange heat indirectly with the circulating water. There is no evaporation of water and no water loss in the whole heat exchange process. The wind after heat exchange becomes high-temperature dry air and enters the upper air chamber of the cooling tower; the circulating water after heat exchange is sprayed downward onto the cross-flow filler due to gravity, and at the same time, the circulating water also falls onto the cross-flow filler through the second branch pipe and the second spray assembly. The circulating water on the cross-flow filler evaporates and exchanges heat with the wind entering from the lower shutter. The wind after heat exchange becomes saturated hot and humid air and enters the upper part of the cooling tower, where it mixes with the high-temperature dry air coming out of the partition heat exchanger to become unsaturated hot and humid air and is discharged out of the tower, thereby avoiding the generation of plume fog and achieving the purpose of fog elimination and water saving;

[0028] When the ambient temperature is very low, only the first cooling system is in operation, that is, valve A on the first branch pipe is opened, the shutter of the first air inlet channel is opened, valve B on the second branch pipe and valve C on the third branch pipe are closed, and the lower shutter is closed; the outside air volume all enters the partition heat exchanger through the shutter of the first air inlet channel, and the circulating water and the wind are indirectly heat exchanged. There is no evaporation of water and no water loss in the whole process, so the purpose of water saving is achieved; the air after heat exchange is dry hot air, which avoids the generation of plume fog and achieves the purpose of fog elimination;

[0029] The present invention communicates with the water inlet pipe through the first branch pipe, the second branch pipe, and the third branch pipe, and controls the opening and closing of the corresponding valves on the first branch pipe, the second branch pipe, and the third branch pipe, and the opening and closing of the shutters of the first air inlet channel and the second air inlet channel, so that the cooling tower of the present invention can be switched to the above three different cooling and heat exchange modes according to the different ambient temperatures in the four seasons, thereby realizing year-round defogging, water saving and energy saving. Compared with others, the technology of the present invention includes three cooling and heat exchange modes, which can meet the defogging needs of the cooling tower at different external temperatures, have good defogging effect, save energy and water, and realize year-round defogging, water saving and energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 This is a structural principle diagram of a first embodiment of a cross-flow type mist-eliminating water-saving cooling tower of the present invention;

[0032] Figure 2 It is a structural schematic diagram of a plate heat exchanger in which the heat exchange membrane of the present invention is a straight plate type;

[0033] Figure 3 1. It is a structural schematic diagram of a plate heat exchanger in which the heat exchange membrane of the present invention is an S-shaped plate;

[0034] Figure 4 It is a structural schematic diagram of a tubular heat exchanger in which the heat exchange tubes of the present invention are circular;

[0035] Figure 5 It is a structural schematic diagram of a tubular heat exchanger in which the heat exchange tubes of the present invention are elliptical.

[0036] In the figure: 1-fan, 2-first spray assembly, 3-partition heat exchanger, 4-louver, 5-valve A, 6-valve B, 7-second spray assembly, 8-cross-flow filler, 9-lower louver, 10-valve C, 11-spray assembly, 12-water collector, 13-upper air chamber, 14-lower air chamber, 15-water collection tank, 16-first branch pipe, 17-second branch pipe, 18-third branch pipe, 19-water inlet pipe. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0038] Example

[0039] See also Figures 1 to 5 The embodiment of the present invention provides a cross-flow mist-eliminating water-saving cooling tower, including a cooling tower body, a fan 1 arranged at the upper part of the tower body, a first cooling system arranged on both sides of the tower body, a cross-flow filler arranged below the partition heat exchanger, a spray assembly 11 arranged above the water pool inside the tower body, and a water collector 12, a circulating water system, a water collection tank 15, a branch pipe and a lower shutter 9. The first spray assembly 2 is composed of a first branch pipe 16 and a nozzle, and is located above the partition heat exchanger 3. The second spray assembly 7 is composed of a second branch pipe 17 and a nozzle, and is located above the filler. The spray assembly 11 is composed of a third branch pipe 18 and a spray nozzle, and is located inside the tower body and above the water pool. It is used when the external environment temperature is high; the water collector 12 is located inside the tower body, directly above the spray assembly 11, and is mainly used to collect floating water.

[0040] The shutters are adjustable shutters, and the amount of air entering the partition heat exchanger 3 and the cross-flow filler 8 is controlled by adjusting the opening thereof.

[0041] The first cooling system is composed of a partition heat exchanger 3 and a shutter 4 .

[0042] The partition-type heat exchanger 3 is a plate-type air cooler, which is composed of a plurality of plate-shaped heat exchange membranes arranged and combined to form different hot and cold channels. The outside air enters the cold channel through the shutters and indirectly exchanges heat with the circulating water entering the hot channel through the water distribution system.

[0043] The wall heat exchanger 3 can be a tubular heat exchanger, and the circulating water is sprayed on the outer surface of the tube through the water distribution system to form a spray water film, and the outside air enters the inside of the tube through the louver and performs wall heat exchange with the external circulating water. The heat exchange tube of the tubular heat exchanger can be various types such as round tube, elliptical tube, corrugated tube, etc.

[0044] The louvers are located outside the partition heat exchanger 3 and the cross-flow filler 8 and are adjustable louvers. The air intake of the partition heat exchanger and the cross-flow filler 8 is controlled by adjusting the opening thereof.

[0045] The first spray assembly 2 is composed of a first branch pipe 16 and a spray head, and is located above the partition wall heat exchanger 3 , and sprays circulating water evenly into the heat channel of the partition wall heat exchanger 3 or on the outer wall of the tube.

[0046] The second spray assembly 7 is composed of a second branch pipe 17 and a spray head, and is located above the filler, and sprays the circulating water evenly on the cross-flow filler 8.

[0047] The spray assembly 11 is located inside the tower body and above the water pool, and is put into use during the high temperature in summer.

[0048] The working principle of this embodiment is:

[0049] When the ambient temperature is high, valve A5 on the first branch pipe 16 is closed, and the partition heat exchanger 3 and the shutter 4 of the first cooling system are closed and stopped; valve B6 on the second branch pipe 17 is opened, valve C10 on the third branch pipe 18 is opened, and the spray assembly 11 is turned on. Wind enters the crossflow tower from the lower shutter 9, directly contacts the water, and takes away heat. The wind temperature rises in this process, but this wind temperature is lower than the upper water temperature of the circulating water. The wind temperature out of the crossflow packing 8 is lower than the water temperature of the spray assembly 11. The two are in contact and heat exchange below the water collector 12, and the wind temperature rises further, so that the circulating water meets the temperature drop. This process undergoes two heat exchanges, and the cooling tower operates efficiently throughout the process to meet the circulating water temperature drop.

[0050] When the ambient temperature is low, the valve C10 on the third branch pipe 18 is closed, and the spray assembly 11 stops running; the valve A5 on the first branch pipe 16 is opened, the valve B6 on the second branch pipe 17 is opened, the shutter 4 and the lower shutter 9 are opened, and the first cooling system partition heat exchanger 3 and the cross flow filler 8 are operated in conjunction; a part of the wind enters the partition heat exchanger 3 through the shutter 4 of the first cooling system to exchange heat indirectly with the circulating water. There is no evaporation of water and no water loss in the whole heat exchange process. The wind after heat exchange becomes high-temperature dry air and enters the upper air chamber 13 of the cooling tower; the circulating water after heat exchange directly enters the cross flow filler 8 and exchanges heat with the wind entering from the lower shutter 9 for evaporation. The wind after heat exchange becomes saturated hot and humid air and enters the cooling tower and mixes with the high-temperature dry air coming out of the partition heat exchanger 3 to become unsaturated hot and humid air and is discharged outside the tower, avoiding the generation of plume fog and achieving the purpose of eliminating fog and saving water. In this process, the upper shutter is fully opened, and the lower shutter is adjusted according to the fog situation and the temperature drop of the circulating water.

[0051] When the ambient temperature is low enough, the valve C10 on the third branch pipe 18 is closed, and the spray assembly 11 stops running; the valve A5 on the first branch pipe 16 is opened, the valve B6 on the second branch pipe 17 is closed, the shutter 4 is opened, and the lower shutter 9 is closed. Only the first cooling system is running, and the circulating water and the wind are indirectly heat exchanged. There is no evaporation of water and no water loss in the whole process, so the purpose of water saving is achieved. The air after heat exchange is dry hot air, and no plume fog is generated, so the purpose of fog elimination is achieved.

[0052] The present invention connects the first branch pipe 16, the second branch pipe 17, and the third branch pipe 18 with the water inlet pipe 19, and controls the opening and closing of the corresponding valves on the first branch pipe 16, the second branch pipe 17, and the third branch pipe 18 and the opening and closing of the shutters 4 and the lower shutters 9, so that the cooling tower of the present invention can be switched to the above three different cooling and heat exchange modes according to the different ambient temperatures in the four seasons, thereby achieving year-round defogging, water saving and energy saving. Compared with others, the technology of the present invention includes three cooling and heat exchange modes, which can meet the defogging needs of the cooling tower at different external temperatures, have good defogging effect, save energy and water, and achieve year-round defogging, water saving and energy saving.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cross-flow mist-eliminating water-saving cooling tower, comprising a tower body, a water collecting pool is provided at the bottom of the tower body, characterized in that: A first cooling system is installed on the inner or outer side of the tower body side wall, wherein the first cooling system includes a partition wall heat exchanger, a first spray assembly installed on the upper part of the partition wall heat exchanger, and a first air inlet channel arranged on the outer side of the partition wall heat exchanger; A cross-flow filler is installed directly below the first cooling system, the water inlet of the first spray assembly is connected to the water inlet pipe through a first branch pipe, and a valve A is installed on the first branch pipe; the first air inlet channel is a shutter, which is installed on the outside of the partition heat exchanger, and the shutter opening is adjustable; The tower body is also provided with a second spray assembly, which is arranged directly above the cross-flow filler. The second spray assembly is connected to the water inlet pipe through a second branch pipe, and a valve B is installed on the second branch pipe; a second air inlet channel is provided on the outer side of the cross-flow filler, and the second air inlet channel is a lower shutter, and the opening of the lower shutter is adjustable; The tower body is also provided with a spray assembly, the water inlet of the spray assembly is connected to the water inlet pipe through a third branch pipe, and a valve C is installed on the third branch pipe; When the ambient temperature is high, valve A on the first branch pipe is closed, and the partition heat exchanger and the shutter of the first cooling system are closed and stopped; valve B on the second branch pipe is opened, valve C on the third branch pipe is opened, and the spray assembly is turned on, and the wind enters the cross flow tower from the lower shutter, directly contacts the water, and takes away the heat; When the ambient temperature is low, valve C on the third branch pipe is closed, and the spray assembly stops running; valve A on the first branch pipe is opened, valve B on the second branch pipe is opened, the shutters and the lower shutters are opened, and the first cooling system partition heat exchanger and the cross-flow filler are operated jointly; a part of the wind enters the partition heat exchanger through the shutters of the first cooling system to exchange heat indirectly with the circulating water. There is no evaporation of water and no water loss in the whole heat exchange process. The wind after heat exchange becomes high-temperature dry air and enters the upper air chamber of the cooling tower; the circulating water after heat exchange directly enters the cross-flow filler to evaporate and exchange heat with the wind entering from the lower shutter. The wind after heat exchange becomes saturated hot and humid air and enters the cooling tower to mix with the high-temperature dry air coming out of the partition heat exchanger to become unsaturated hot and humid air and be discharged outside the tower. In this process, the upper shutters are fully opened, and the lower shutters are adjusted in size according to the fog situation and the temperature drop of the circulating water; When the ambient temperature is low enough, valve C on the third branch pipe is closed and the spray assembly stops running; valve A on the first branch pipe is opened, valve B on the second branch pipe is closed, the shutters are opened, and the lower shutters are closed. Only the first cooling system is running, and the circulating water and wind perform indirect heat exchange. There is no evaporation of water and no water loss in the whole process.

2. A cross-flow demisting water-saving cooling tower according to claim 1, characterized in that: A water collector is also provided inside the tower body. The installation height of the water collector is located between the second spray assembly and the partition-type heat exchanger. The spray assembly is located directly below the water collector.

3. A cross-flow mist-eliminating water-saving cooling tower according to claim 1, characterized in that: The partition-type heat exchanger is a plate-type heat exchanger, which includes heat exchange channels which are formed by arranging and combining a plurality of plate-shaped heat exchange membranes and are not interconnected.

4. A cross-flow demisting water-saving cooling tower according to claim 3, characterized in that: The heat exchange channel includes a cold air channel and a hot water channel, and the cold air channel and the hot water channel are arranged at intervals.

5. A cross-flow demisting water-saving cooling tower according to claim 4, characterized in that: The heat exchange membrane of the plate heat exchanger is a straight plate or an S-shaped plate.

6. A cross-flow mist-eliminating water-saving cooling tower according to claim 1, characterized in that: The partition wall heat exchanger is a tube heat exchanger.

7. A cross-flow demisting water-saving cooling tower according to claim 6, characterized in that: The heat exchange tubes of the tubular heat exchanger are in the shape of round tubes, elliptical tubes or corrugated tubes.

8. A cross-flow mist-eliminating water-saving cooling tower according to claim 1, characterized in that: An axial flow fan for sucking external air into the partition-type heat exchanger is installed on the outside or inside of the shutter.

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