CN114198830A

CN114198830A - High-efficient indirect evaporative cooling device

Info

Publication number: CN114198830A
Application number: CN202111497649.5A
Authority: CN
Inventors: 杨鲁旭; 陈良才
Original assignee: Jiangsu Greenland Heat Transfer Technology Co ltd
Current assignee: Jiangsu Greenland Heat Transfer Technology Co ltd
Priority date: 2021-12-09
Filing date: 2021-12-09
Publication date: 2022-03-18

Abstract

The invention discloses a high-efficiency indirect evaporative cooling device, which belongs to the technical field of cooling and comprises a box body, a spraying device, a medium feeding device, an exhaust device, a cold air blower, a dry cooling section, an evaporative cooling section, a filler region and a water collecting tank, wherein the dry cooling section is arranged at the upper part of the box body, the evaporative cooling section and the filler region are arranged in the middle of the box body, the cold air blower is arranged at the lower part of the box body, the filler region is arranged below the evaporative cooling section, the spraying device is arranged at the side of the box body, the spraying device is communicated with the box body, the medium feeding device is arranged at the middle end of the box body, the exhaust device is arranged at the upper end of the box body, the filler region is arranged below the evaporative cooling section, and the water collecting tank is arranged at the inner bottom of the box body. The invention can provide spray water with lower temperature for evaporative cooling, and can improve the heat transfer efficiency of the evaporative cooling and the cooling efficiency of the whole cooling device.

Description

High-efficient indirect evaporative cooling device

Technical Field

The invention relates to the technical field of cooling, in particular to a high-efficiency indirect evaporative cooling device.

Background

Closed cooling towers are commonly used to reduce the temperature of circulating water in various industrial fields and central air conditioners. For example, chinese patent publication No. CN2015202979420 discloses a closed cooling tower, which is provided with an air duct and a fan at the top, and a dehydrator, a spray pipe, an evaporation heat exchange tube bundle, a filler for cooling water, an air inlet shutter and a water tank in sequence from bottom to top. When the closed tower operates, circulating water enters the tube pass of the evaporation heat exchange tube bundle, flows and releases heat to the water film outside the tube, the temperature of the circulating water is reduced after the heat is released, and then the circulating water is discharged out of the tower. When the water-cooled evaporator is in operation, water in the water tank at the bottom of the tower is pumped to the spray pipe by the water pump and is sprayed on the outer surface of the pipe of the evaporation heat exchange pipe bundle to form a water film, so that heat in the pipe is absorbed, water vapor is evaporated towards air passing through the water film, and the heat is transferred to the air. Under the action of gravity, the water film outside the tube falls on the filler, evaporates to the air passing through the water film of the filler, reduces the water temperature, then falls into the water tank at the bottom of the tower, and is pumped to the spray pipe, and the process is repeated in a circulating way. Under the suction action of the tower top fan, ambient air enters from the louver at the lower part of the tower body, water vapor evaporated by water films on the filler and the tube bundle is sequentially absorbed, latent heat of water is brought away, and medium heat in the tube is indirectly brought away.

When the cooling tower is used in summer, the circulating water is often not cooled to the low temperature required by a user; in winter, cold air is easy to freeze when contacting with sprayed water, and the water temperature cannot be reduced when the air is not supplied. Therefore, it is necessary to provide an efficient evaporative cooling device, which can cool the circulating water or other cooled media to a lower temperature and can not freeze in winter.

Disclosure of Invention

The invention provides a high-efficiency indirect evaporative cooling device, which aims to solve the problems in the prior art.

The invention provides a high-efficiency indirect evaporative cooling device which comprises a box body, a spraying device, a medium feeding device, an air exhaust device, an air cooler, a dry cooling section, an evaporative cooling section, a filler area and a water collection tank, wherein the dry cooling section is arranged at the upper part of the box body, the evaporative cooling section and the filler area are arranged in the middle of the box body, the air cooler is arranged at the lower part of the box body, the filler area is arranged below the evaporative cooling section, the spraying device is arranged at the side of the box body, the spraying device is communicated with the box body, the medium feeding device is arranged at the middle end of the box body, the air exhaust device is arranged at the upper end of the box body, the filler area is arranged below the evaporative cooling section, the water collection tank is arranged at the inner bottom of the box body, and an air inlet is formed in the box body.

Further, the filling area is filled with hydrophilic thin layer materials.

Furthermore, the air cooler comprises a circulating pipe and a fin tube bundle or other dividing wall type heat exchangers, the air cooler is located below the filling area, the fin tube bundles or other dividing wall type heat exchangers are installed around the air inlet of the box body, the fin tube bundle or other dividing wall type heat exchangers are communicated with the circulating pipe, and the circulating pipe is communicated with the water outlet pipe.

Furthermore, an upper shutter is arranged below the dry cooling section, a lower shutter is arranged outside the air cooler, and the opening degrees of the upper shutter and the lower shutter can be adjusted.

Furthermore, spray set includes spray pump, outlet pipe and shower, the spray pump is located the box and its water inlet with the water catch bowl intercommunication, the shower is in the top of evaporation cold section, the both ends of outlet pipe communicate spray pump and shower respectively.

Further, the medium feeding device comprises two return pipes, each return pipe is provided with a feeding hole and a discharging hole, the feeding hole is located at the dry and cold section, and the discharging hole is located at the evaporation and cold section.

Furthermore, a dehydrator is horizontally arranged in the box body and is positioned between the spray pipe and the upper shutter.

Further, exhaust device includes the fan of two high wind pressures, two the fan symmetry sets up the top at the box.

Compared with the conventional evaporative cooling device, the embodiment of the invention adopts at least one technical scheme, which can achieve the following beneficial effects:

firstly, the added dry and cold section can increase one-time heat exchange, the heat of the cooled medium in the dry and cold section is absorbed by utilizing the outlet air of the evaporation cold in the middle part, the utilization rate of the cold air is improved, and the amount of the evaporated water outside the evaporation cold section can be reduced after the cooled medium releases partial heat in the dry and cold section, thereby playing a role of saving water.

Secondly, when the air cooler is operated in summer, the temperature of dry balls and the temperature of wet balls of ambient air can be reduced by 5-8℃, so that the cooled medium can obtain lower outlet temperature; in addition, when air flows to the upper part of the box body, the temperature of an air inlet dry bulb of the dry cooling section is reduced by 3-5℃ so as to absorb more heat in the dry cooling section, and the amount of water evaporated outside the pipe of the evaporative cooling section is further reduced; in addition, after the temperature of dry balls and the temperature of wet balls of the incoming air of the environment are reduced by 5-8 ℃, the incoming air enters a filler area, and spray water with lower temperature is obtained so as to keep the spray water to continuously provide low-temperature cold air through a cold air cooler.

Thirdly, when the device is used in winter, the spraying device and the air cooler can be closed, and ambient cold air is respectively introduced into the evaporative cooling section and the dry cooling section or only introduced into the dry cooling section by adjusting the opening degrees of the upper shutter and the lower shutter, so that the temperature of a cooled medium is reduced. Under the operation mode, the device has no water spraying and water consumption.

Fourthly, if the ambient temperature is lower than 0 ℃ in winter, the cold medium in the pipe of the device can be frozen. In order to avoid the freezing phenomenon, the water spraying can be recovered, and simultaneously, the opening degree of the louver window outside and below the air cooler is reduced, so that the air inlet volume of the air cooler is reduced. After the heat in the pipe of the evaporation cooling section is absorbed by the shower water, the temperature rises, the shower water falls into a water collecting tank through the filler, and then the shower water is pumped into the pipe of the air cooler to release heat to the cold air outside the pipe. After the temperature of cold air outside the air cooler is raised to be above the freezing point, the cold air enters the filling area and the evaporation cooling section, so that the water spraying and freezing can be avoided, and the freezing of cold media in the air cooler can also be avoided. Under this mode of operation, the cold air ware has become "warm braw ware", can effectively avoid being frozen by cold medium.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the invention without limiting it. In the drawings:

FIG. 1 is a first schematic view of the present invention;

FIG. 2 is a second schematic view of the present invention;

FIG. 3 is a third schematic view of the present invention;

fig. 4 is a schematic view of the air cooler of the present invention.

Reference numerals: the device comprises a box body 1, a water collecting tank 11, a filling area 12, a lower shutter 13, an upper shutter 14, a spraying device 2, a spraying pump 21, a water outlet pipe 22, a spraying pipe 23, a medium feeding device 3, a return pipe 31, a feeding hole 32, a discharging hole 33, an exhaust device 4, a high-wind pressure fan 41, a cold air blower 5, a circulating pipe 51, a finned tube bundle or other dividing wall type heat exchanger 52, a dry cooling section 6, an evaporation cooling section 7 and a dehydrator 8.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described with reference to specific embodiments of the present invention and accompanying drawings. It is obvious that only a few embodiments of the invention can be provided, and that not all embodiments are exhaustive. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the present embodiment, belong to the protection scope of the present invention.

As shown in fig. 1 to 4, an embodiment of the present invention provides a high-efficiency indirect evaporative cooling device, which includes a box 1, a spraying device 2, a medium feeding device 3, an air exhaust device 4, a cold air blower 5, a dry cooling section 6, an evaporative cooling section 7, a filling area 12 and a water collection tank 11, the dry cooling section 6 is arranged at the upper part of the box body 1, the evaporative cooling section 7 and the filling area 12 are arranged at the middle part of the box body 1, the air cooler 5 is arranged at the lower part of the box body 1, the filling material area 12 is arranged below the evaporative cooling section 7, the spraying device 2 is arranged at the side of the box body 1, the spraying device 2 is communicated with the box body 1, the medium feeding device 3 is positioned at the middle end of the box body 1, the air exhaust device 4 is positioned at the upper end of the box body 1, the filling area 12 is positioned below the evaporation cooling section 7, the water collecting tank 11 is positioned at the inner bottom of the box body 1, and an air inlet is formed in the box body 1.

After the ambient air passes through the cold air device 5, the filling area 12 and the evaporation cold section 7, the temperature rise is generally not high, and the ambient air can still be used as a cold source of the dry cold section, so that the dry cold section 6 is added, a part of heat dissipation load of a cooled medium can be effectively borne, the heat dissipation load of the evaporation cold section 7 and the amount of evaporated water outside the pipe are reduced, and the water saving effect is achieved.

When the device is used in summer, the lower shutter 13 is opened, ambient air is cooled through the air cooler 5, and after entering the filler area 12, low-temperature water which is close to or even lower than the ambient wet bulb temperature can be obtained and falls into the water collecting tank 11; the low-temperature water in the water collecting tank 11 is sent to the air cooler 5 by the spray pump 21 to obtain low-temperature air inlet filler, and the low-temperature water is sent to the spray device 2 and sprayed on the evaporative cooling section 7, so that the temperature of a cooled medium in the pipe is effectively reduced.

Specifically, the filler region 12 is filled with a hydrophilic thin layer material to enlarge the water-wind action area and enhance the effect of reducing the water temperature.

Specifically, the air cooler 5 comprises a circulating pipe 51 and a finned tube bundle or other dividing wall type heat exchanger 52, the air cooler 5 is located below the filling area 12, a plurality of finned tube bundles or other dividing wall type heat exchangers 52 are installed around an air inlet of the box body 1, the finned tube bundle or other dividing wall type heat exchangers 52 are communicated with the circulating pipe 51, and the circulating pipe 51 is communicated with the water outlet pipe 22; the spraying device 2 comprises a spraying pump 21, a water outlet pipe 22 and a spraying pipe 23, the spraying pump 21 is located beside the box body 1, the water inlet end of the spraying pump 21 is communicated with the water collecting tank 11, the spraying pipe 23 is horizontally arranged in the box body 1, and the two ends of the water outlet pipe 22 are communicated with the spraying pump 21 and the spraying pipe 23. The spray pump 21 conveys water in the water collecting tank 11 to the spray pipe 23 through the water outlet pipe 22, the spray pipe 23 sprays the water on the surface of the heat exchange pipe of the evaporation cold section 7, the heat absorption and the temperature rise are realized, the water further falls into the packing area 12, and when the water meets low-temperature air which is reduced in temperature through the cold air blower 5, the spray water is evaporated on the surface of the packing area 12, and the water temperature is reduced.

Specifically, the medium feeding device 3 comprises two return pipes 31, each return pipe 31 is provided with a feeding hole 32 and a discharging hole 33, the feeding end of each return pipe 31 is located at the dry cooling section 6 of the box 1, and the discharging end of each return pipe 31 is located at the evaporative cooling section 7. The cooled medium enters the dry cooling section 6 and the evaporation cooling section 7 in sequence through the feed inlet 32, and is discharged through the discharge outlet 33 after cooling or condensation.

Specifically, the exhaust device 4 includes two high wind pressure fans 41, two of the high wind pressure fans 41 are symmetrically disposed on the top of the box body 1, and the two high wind pressure fans 41 can discharge the wet air after absorbing heat and water vapor upwards to enter the atmosphere.

Specifically, an upper louver 14 is arranged below the dry cooling section 6, a lower louver 13 is arranged outside the air cooler 5, and the opening degrees of the upper louver 14 and the lower louver 13 can be adjusted. The upper shutter 14 can be opened for use in winter, and the spraying device 2 and the air cooler 5 are closed at the same time, so that the wind resistance flowing through the air cooler 5 and the spraying device 2 is avoided; after the upper shutter 14 is opened, outside cold air directly enters the medium in the dry cooling section 6, the finned tube bundle or other dividing wall type heat exchangers 52, and at the moment, the device has no water spraying and water consumption, saves energy and water.

Specifically, a dehydrator 8 is horizontally arranged in the box body 1, and the dehydrator 8 is positioned between the spray pipe 23 and the upper louver 14. The dehydrator 8 can separate the small water drops from the air, gather on the surface of the dehydrator 8, gradually grow into large water drops, and then fall into the packing area 12 and the water collecting tank 11 for recovery. The dehydrator 8 has the functions of greatly reducing the loss of the floating drops and preventing the water drops ascending along with the wind from hitting the blades of the high wind pressure fan 41 to damage the high wind pressure fan 41.

The working principle and the operation mode of the invention are as follows:

1) when the water-cooled heat exchanger runs in summer, the lower shutter 13 is opened, ambient air enters the air cooler 5, the air is cooled after cold energy of cold water in the pipe of the air cooler 5 is absorbed, then the air enters the filler area 12, latent heat of evaporation of shower water is absorbed, the water temperature is reduced, low-temperature water falls into the water collecting tank 11, and a part of or all of the low-temperature water enters the pipe of the air cooler 5 again to continue to cool the ambient air;

the water from the cold air device pipe continuously goes upwards to enter the spraying device 2 and is sprayed on the surface of the pipe of the evaporation cold section 7 to form a water film, so that the heat of the cooled medium in the pipe is absorbed, and the temperature is increased; under the action of gravity, the water film descends until the water film falls into the filling area 12 to be cooled;

the air from the filling area 12 goes up to the space outside the tube of the evaporation cold section, continues to go up after absorbing the water vapor evaporated by the water film outside the tube, passes through the spraying area and the water collector, goes outside the tube of the dry cold section 6, absorbs the heat emitted by the cold medium in the tube, and is discharged by the fan after the air is heated again.

2) In winter, when the environment operates at the temperature of more than 0 ℃, the spraying device 2 and the air cooler 5 are closed, and the ambient cold air is respectively introduced into the evaporative cooling section 7 and the dry cooling section 6 or only introduced into the dry cooling section 6 by adjusting the opening degrees of the upper shutter 14 and the lower shutter 13, so as to cool the cooled medium. Under the operation mode, the device has no water spraying and water consumption.

3) In winter, when the air conditioner operates at the temperature of below 0 ℃, in order to avoid the freezing of the cooled medium in the pipe, the water spraying can be recovered, and the opening degree of the shutter 13 outside the air cooler 5 is reduced to reduce the air inlet amount of the air cooler 5. After absorbing the heat in the pipe of the evaporation cooling section 7, the water rises in temperature, falls into the water collecting tank after sequentially falling into the filler area 12, is pumped into the pipe of the air cooler, and releases heat to the cold air outside the pipe. The cold air outside the cold air section absorbs heat and rises to above the freezing point, and then enters the filling area and the evaporation cold section, so that the water spraying and freezing can be avoided, and the freezing of the cold medium in the pipe can also be avoided. Under this mode of operation, the air cooler has become "fan heater", effectively avoids being frozen by cold medium.

The above description is only an example of the present invention, and does not limit the flexible application of the present invention. Various modifications and changes may occur to those skilled in the art within the scope of the invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention are included in the scope of the claims of the present invention.

Claims

1. The high-efficiency indirect evaporative cooling device is characterized by comprising a box body (1), a spraying device (2), a medium feeding device (3), an air exhaust device (4), a cold air blower (5), a dry cooling section (6), an evaporative cooling section (7), a filler area (12) and a water collection tank (11), wherein the dry cooling section (6) is arranged at the upper part of the box body (1), the evaporative cooling section (7) and the filler area (12) are arranged in the middle part of the box body (1), the cold air blower (5) is arranged at the lower part of the box body (1), the filler area (12) is arranged below the evaporative cooling section (7), the spraying device (2) is arranged beside the box body (1), the spraying device (2) is communicated with the box body (1), the medium feeding device (3) is arranged at the middle end of the box body (1), and the air exhaust device (4) is arranged at the upper end of the box body (1), the filler area (12) is located below the evaporation cooling section (7), the water collecting tank (11) is located at the inner bottom of the box body (1), and an air inlet is formed in the box body (1).

2. A high efficiency indirect evaporative cooling apparatus as claimed in claim 1 wherein: the filling area (12) is filled with hydrophilic thin layer materials.

3. A high efficiency indirect evaporative cooling apparatus as claimed in claim 1 wherein: an upper shutter (14) is arranged below the dry cooling section (6), a lower shutter (13) is arranged outside the air cooler (5), and the opening degrees of the upper shutter (14) and the lower shutter (13) can be adjusted.

4. A high efficiency indirect evaporative cooling apparatus as claimed in claim 3 wherein: spray set (2) are including spraying pump (21), outlet pipe (22) and shower (23), spray pump (21) be located box (1) other and its water inlet with water catch bowl (11) intercommunication, shower (23) are in the top of evaporation cold section (7), the both ends of outlet pipe (22) communicate respectively and spray pump (21) and shower (23).

5. An efficient indirect evaporative cooling apparatus as set forth in claim 4, wherein: the air cooler (5) comprises a circulating pipe (51) and a finned tube bundle or other dividing wall type heat exchangers (52), the air cooler (5) is located below the filling area (12), a plurality of finned tube bundles or other dividing wall type heat exchangers (52) are installed around an air inlet of the box body (1), the finned tube bundle or other dividing wall type heat exchangers (52) are communicated with the circulating pipe (51), and the circulating pipe (51) is communicated with the water outlet pipe (22).

6. A high efficiency indirect evaporative cooling apparatus as claimed in claim 1 wherein: the medium feeding device (3) comprises two return pipes (31), each return pipe (31) is provided with a feeding hole (32) and a discharging hole (33), the feeding hole (32) is located at the dry cooling section (6), and the discharging hole (33) is located at the evaporation cooling section (7).

7. An efficient indirect evaporative cooling apparatus as set forth in claim 4, wherein: the box body (1) is internally and horizontally provided with a dehydrator (8), and the dehydrator (8) is positioned between the spray pipe (23) and the upper shutter (14).

8. A high efficiency indirect evaporative cooling apparatus as claimed in claim 1 wherein: the exhaust device (4) comprises two fans (41) with high wind pressure, and the two fans (41) are symmetrically arranged at the top of the box body (1).