CN108036657B - Combined type water-saving closed cooling tower and control method thereof - Google Patents
Combined type water-saving closed cooling tower and control method thereof Download PDFInfo
- Publication number
- CN108036657B CN108036657B CN201810045536.3A CN201810045536A CN108036657B CN 108036657 B CN108036657 B CN 108036657B CN 201810045536 A CN201810045536 A CN 201810045536A CN 108036657 B CN108036657 B CN 108036657B
- Authority
- CN
- China
- Prior art keywords
- water
- cooling tower
- spray
- air inlet
- heat exchanger
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C1/00—Direct-contact trickle coolers, e.g. cooling towers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F25/00—Component parts of trickle coolers
- F28F25/02—Component parts of trickle coolers for distributing, circulating, and accumulating liquid
- F28F25/06—Spray nozzles or spray pipes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F25/00—Component parts of trickle coolers
- F28F25/02—Component parts of trickle coolers for distributing, circulating, and accumulating liquid
- F28F25/08—Splashing boards or grids, e.g. for converting liquid sprays into liquid films; Elements or beds for increasing the area of the contact surface
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F25/00—Component parts of trickle coolers
- F28F25/10—Component parts of trickle coolers for feeding gas or vapour
- F28F25/12—Ducts; Guide vanes, e.g. for carrying currents to distinct zones
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
- F28F27/003—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus specially adapted for cooling towers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses a combined water-saving closed cooling tower, wherein one side of the top of the cooling tower is provided with an air inlet, and the other side of the top of the cooling tower is provided with a fan; a metal heat exchanger is arranged on one side of the middle part of the cooling tower, a first spray pipe assembly is arranged between the metal heat exchanger and the top air inlet, a heat insulation and humidification assembly is arranged between the first spray pipe assembly and the top air inlet, PVC filler is arranged on the other side of the middle part of the cooling tower, and a second spray pipe assembly is arranged between the PVC filler and the high-efficiency water receiver; the bottom of the cooling tower is provided with a water tray, the water tray is connected with a spray water pump, and the spray water pump is connected with the first spray pipe assembly and the second spray pipe assembly in parallel. The cooling tower takes an adiabatic humidifying cooling mode as a main and a plurality of cooling modes as auxiliary operation strategies, so that the water-saving characteristic is good; the metal heat exchanger and the PVC material filler component are horizontally arranged in parallel, so that the application of the internal space is optimized, and the problems of high height and large occupied area of the cooling tower are solved; the second spray pipe component stops working in winter, so that the problem of freezing and collapsing of PVC filler in winter is solved.
Description
Technical Field
The invention belongs to the technical field of closed cooling towers, and particularly relates to a combined water-saving closed cooling tower and a control method thereof.
Background
A closed cooling tower is a device for radiating heat generated in an industrial or refrigerating air conditioner by evaporation of water by contact of water and air. The working principle is that water with higher temperature (inner circulating water for short) flows in a heat exchanger in the closed cooling tower, ambient air with lower temperature enters the cooling tower from an air inlet after being sucked by a fan, and water in a water tray of the cooling tower (outer circulating water for short) is sucked by a spray water pump and is distributed to the surface of a heat exchange part for heat dissipation through a spray pipe and a spray header. Referring to fig. 6, the cooled heat is mainly carried away in two forms, one is that the external circulating water evaporates and dissipates heat on the surface of the heat exchange component, and the other is that the external circulating water contacts the surface of the heat exchange component, and the temperature of the internal circulating water is higher than that of the external circulating water to conduct and dissipate heat. If the external circulation water temperature is lower than the internal circulation water temperature, the contact heat dissipation and the evaporation heat dissipation are positive; if equal, contactless heat dissipation; if the outer circulation water temperature is higher than the inner circulation water temperature, the contact heat dissipation is negative, namely contact heating.
The cooling capacity of the closed cooling tower is changed along with the change of the temperature of the ambient wet bulb, the temperature of the ambient wet bulb is high in summer, the temperature difference between the internal circulating water and the ambient air is small, the cooling capacity is weak, and the temperature of the outlet water of the closed cooling tower is high; the temperature of the ambient wet bulb is low in winter, the temperature difference between the internal circulating water and the ambient air is large, and the cooling capacity is large, so that the water outlet temperature of the closed cooling tower is low. The temperature difference between the water outlet temperature and the wet bulb temperature of the cooling tower is called cold width or approximation degree, the theoretical limit temperature of the water outlet temperature of the cooling tower is the wet bulb temperature, namely the approximation degree is 0 ℃, the practical application considers economy, the approximation degree of the design of the closed cooling tower is 3-5 ℃, the smaller the approximation degree is, the larger the designed cooling tower is, but the hot time occupied when the wet bulb temperature in summer is higher is smaller, the cooling capacity redundancy of the cooling tower is large in other seasons of the whole year, the cooling mode of the existing closed cooling tower is a spraying mode, the adjustment of the cooling capacity cannot be realized, the water outlet temperature of the cooling tower in seasons except summer is lower than the designed water outlet temperature, and the water consumption and the power consumption of invalid evaporation are huge.
The heat exchange components of the closed cooling tower in the prior art mainly have two types: one adopts a metal heat exchanger as a heat exchange component, the other adopts a part of metal heat exchanger for heat exchange and a part of PVC filler for heat exchange, and the purpose of PVC filler heat exchange is to reduce the temperature of external circulating water, thereby increasing contact heat dissipation. The closed cooling tower is mainly divided into a countercurrent type closed cooling tower, a concurrent type closed cooling tower and a cross flow type closed cooling tower (or cross flow type closed cooling tower) according to the flowing direction of wind in the tower and the flowing direction of external circulation spray water, and the closed cooling towers of different types have respective advantages and disadvantages and are applied to different environments and occasions.
The heat exchange part of the countercurrent closed cooling tower in the prior art is a metal heat exchanger, no PVC filler exists, the temperature of external circulating water in a water tray is higher and is close to the ambient temperature in summer, the contact heat dissipation is small, the heat dissipation of the cooling tower is mainly realized through evaporation heat dissipation, and the PVC filler does not exist in winter, so that the countercurrent closed cooling tower has the advantages of no risk of freezing and collapsing of the PVC filler in winter, the disadvantage of single spray cooling in a annual cooling mode, and the disadvantage of huge ineffective evaporation water consumption and power consumption except summer is that the heat exchange part is all made of metal materials, and the cost of the cooling tower is high.
The heat exchange part of the concurrent flow type and cross flow type closed cooling tower is a mode of combining a metal heat exchanger and PVC filler, when external circulating water in a water tray passes through the surface of the PVC filler in summer, part of external circulating water dissipates heat to reduce the water temperature in the whole water tray, and the heat dissipation part of the cooling tower dissipates heat through evaporation of the external circulating water and part of the cooling tower dissipates heat through PVC filler contact. The heat exchange part is the PVC filler, so that the concurrent cooling tower and the cross flow cooling tower have the advantages of low cost compared with the counter flow closed cooling tower, and the disadvantage is that the surface of the PVC filler is covered by a water film all the year round, and the water consumption of ineffective evaporation on the surface of the PVC filler is higher; the second disadvantage is that the PVC filler has low strength, and the external circulating water is easy to freeze after being sprayed to the PVC filler in winter, so that the PVC filler collapses; the third disadvantage is that the metal heat exchanger and PVC filler of the concurrent closed cooling tower are arranged up and down, the overall height of the cooling tower is higher, the space in the cooling tower at the lower part of the fan is open, and the space is not fully utilized; the packing and the heat exchange tube of the metal heat exchanger of the cross flow closed cooling tower are intermittently arranged, so that the occupied area is large.
In summary, in the existing closed cooling tower technology, if the heat exchange component is made of a metal heat exchanger and has no PVC packing, the closed cooling tower has higher cost, and has large redundancy of cooling capacity in most of the whole year, and the spray cooling mode is single, so that the ineffective evaporation water consumption and the power consumption are both large; if the heat exchange part consists of a metal heat exchanger and PVC filler, the annual cooling mode is single spray cooling, and ineffective evaporation water consumption exists on the surfaces of the metal heat exchanger and the PVC filler except for other seasons in summer, so that the water consumption is huge, and the power consumption is also larger. If PVC filler exists in the heat exchange part of the existing closed cooling tower, when the environmental temperature in winter is lower than 0 ℃, spray water exists on the surface of the PVC filler, so that the risk of freezing and collapsing exists, and the arrangement mode of the PVC filler and the metal heat exchanger of the closed cooling tower is unreasonable, so that the height of the cooling tower is higher or the occupied area is large.
Disclosure of Invention
The invention aims at the problems and provides a combined type water-saving closed cooling tower and a control method thereof.
The aim of the invention can be achieved by the following technical scheme: a first air inlet is formed in one side of the top of the cooling tower, a fan is arranged on the other side of the top of the cooling tower, and a high-efficiency water receiver is arranged at the lower side of the corresponding fan in the cooling tower; a metal heat exchanger is arranged on one side, corresponding to the first air inlet, in the middle part of the cooling tower, a water inlet and a water outlet are arranged on the metal heat exchanger, a first spray pipe assembly is arranged between the metal heat exchanger and the first air inlet, a heat insulation and humidification assembly is arranged between the first spray pipe assembly and the first air inlet, PVC filler is arranged on the other side, corresponding to the fan and the high-efficiency water receiver, in the middle part of the cooling tower, and a second spray pipe assembly is arranged between the PVC filler and the high-efficiency water receiver; the side surface of the lower part of the cooling tower is provided with an air inlet; a water tray is arranged at the bottom of the cooling tower, a spray water pump is connected to an outlet of the water tray through a pipeline, the spray water pump is connected with the first spray pipe assembly and the second spray pipe assembly in parallel through pipelines, and an electric switch valve is arranged on a pipeline connecting the spray water pump with the second spray pipe assembly; the water tray is also connected with a water supplementing port through a pipeline, and a ball float valve is arranged on the pipeline connected with the water tray; the water supplementing port is also connected with the heat insulation and humidification assembly through a pipeline, and an electric regulating valve is arranged on the pipeline connecting the water supplementing port with the heat insulation and humidification assembly.
Further, the adiabatic humidification assembly includes a plurality of adiabatic humidification devices; the first spray pipe assembly and the second spray pipe assembly comprise a plurality of spray pipes and a plurality of spray heads arranged on the spray pipes; the opening degree of the electric switch valve is 0 degree or 90 degrees, and the opening degree of the electric regulating valve is 0 degree to 90 degrees; the air inlet of the side surface of the lower part of the cooling tower comprises a second air inlet, a third air inlet and a fourth air inlet.
Preferably, the metal heat exchanger and the PVC filler are horizontally arranged in parallel.
Further, the intelligent air conditioner comprises a control system, a water supply temperature sensor is arranged at a water inlet of the metal heat exchanger, a backwater temperature sensor is arranged at a water outlet of the metal heat exchanger, a temperature and humidity sensor is arranged at a second air inlet, a third air inlet and a fourth air inlet, and the fan, the electric regulating valve, the electric switching valve, the temperature sensor and the temperature and humidity sensor are all connected to the control system.
The control system adjusts the cooling mode grade of the cooling tower according to the temperature values measured by a temperature and humidity sensor, a water supply temperature sensor and a water return temperature sensor, the lower deviation of the temperature value lower than the set temperature of the cooling mode reduces the primary cooling mode grade, and the upper deviation of the temperature value higher than the set temperature of the cooling mode increases the primary cooling mode grade; the cooling mode grade of the cooling tower is respectively from high to low according to the ambient temperature: in the composite cooling mode, a fan, a spray water pump and an electric switch valve are opened, an electric regulating valve is closed, external circulating water in a water tray is conveyed to a first spray pipe assembly and a second spray pipe assembly through the spray water pump, and spray water is sprayed to a metal heat exchanger and PVC filler; in the spray cooling mode, a fan and a spray water pump are started, an electric switch valve and an electric regulating valve are closed, and external circulating water in a water tray is conveyed to a first spray pipe assembly through the spray water pump and sprayed to a metal heat exchanger for cooling; in the heat-insulating cooling mode, a spray water pump and an electric switch valve are closed, a fan and an electric regulating valve are opened, water replenishing at a water replenishing port is conveyed to a heat-insulating humidifying assembly after passing through the electric regulating valve, and the heat-insulating humidifying assembly carries out heat-insulating humidifying on air at a first air inlet and then passes through a metal heat exchanger, so that internal circulating water inside the metal heat exchanger is cooled; and in a dry cooling mode, the spray water pump, the electric switch valve and the electric regulating valve are closed, the fan is opened, and the internal circulating water inside the metal heat exchanger is cooled by the sucked air.
Further, during winter operation, the second shower assembly above the PVC packing ceases to operate.
The invention has the beneficial effects that: (1) The evaporation of the external circulating water can improve the cooling capacity, adopts a cooling mode which is mainly based on heat insulation humidification cooling, is assisted by three cooling modes of compound cooling, spray cooling and dry cooling, and automatically adjusts the cooling capacity according to the change of the ambient temperature, adopts the compound cooling and spray cooling modes when the ambient temperature is higher, adopts the dry cooling mode when the ambient temperature is lower, adopts the heat insulation humidification cooling mode in most of transitional seasons, and has relatively shorter environment in one year and relatively shorter transitional season time, so that the consumption of the external circulating water can be greatly reduced;
2) The water particles sprayed by the heat-insulating humidifying device are tiny to below 100um, the atomized water particles sprayed by the heat-insulating humidifying device are uniformly arranged in the gap of a heat exchange tube of the metal heat exchanger, a water film with thinner thickness is formed on the surface of the heat exchange tube, and the air is easy to evaporate and absorb heat after passing through the surface;
3) The heat exchange part is a metal heat exchanger, the part is PVC filler, when the heat exchange part runs in winter, the surface of the PVC filler is free of spray water, the PVC filler of the existing cooling tower technology has spray water when the heat exchange part runs in winter, the use of the concurrent cooling tower and the cross flow cooling tower is affected by the problem that the PVC filler is easy to freeze and collapse in winter, the counter flow cooling tower can overcome the problem that the PVC filler is frozen when being applied in severe cold areas in winter because the heat exchange part is free of the PVC filler, but the heat exchanger is all made of metal materials, so the cost is greatly increased, and therefore, the invention can overcome the problem that the PVC filler is frozen and collapses in the existing concurrent cooling tower technology and also can overcome the problem that the cost of the counter flow cooling tower is too high;
4) The metal heat exchanger and the PVC material filler component are horizontally arranged in parallel, and compared with the prior concurrent cooling tower or cross flow cooling tower technology, the height of the cooling tower is reduced or the occupied area is reduced, and the internal space is greatly optimized;
5) The control system is added, the control system can automatically control the cooling mode according to the change of the ambient temperature, so that the cooling capacity is adjusted, in the composite cooling mode, the fan, the spray pump and the spray electric switch valve are turned on, in the spray cooling mode, the fan and the spray pump are turned on, in the adiabatic humidification cooling mode, the fan and the adiabatic humidification electric valve regulating valve are turned on, the opening degree of the adiabatic humidification electric regulating valve can be adjusted according to the ambient temperature, and in the dry cooling mode, the fan is turned on, and the running state of each electric component is fed back to the control system, so that the operation, the maintenance and the maintenance are facilitated.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a front view of the external structure of the present invention.
Fig. 3 is a left side view of the external structure of the present invention.
Fig. 4 is a top view of the external structure of the present invention.
Fig. 5 is a schematic diagram showing a comparison of thermally insulated humidified particles with spray water particles.
Fig. 6 is a schematic diagram of the relationship between contact heat dissipation and evaporative heat dissipation.
Fig. 7 is a schematic diagram of a control system.
The components in the figures are numbered as follows:
1 blower fan
2 metal heat exchanger
201 water inlet
202 water outlet
3 PVC filler
4 high-efficient water collector
501 first air inlet
502 second air inlet
503 third air inlet
504 fourth air inlet
6 adiabatic humidifying component
701 first spray pipe assembly
702 second shower assembly
8 spray water pump
9 water tray
10 float valve
11 electric regulating valve
12 electric switch valve
13 water supplementing port
14 control system
1401 water supply temperature sensor
1402 temperature and humidity sensor
1403 backwater temperature sensor.
Detailed Description
The following detailed description of the invention, taken in conjunction with the accompanying drawings, will provide those skilled in the art with a more readily understood understanding of how the invention may be practiced. While the present invention has been described in connection with the preferred embodiments thereof, these embodiments are set forth only and are not intended to limit the scope of the invention.
Referring to fig. 1 to 4, a first air inlet 501 is formed in one side of the top of the cooling tower, a fan 1 is arranged on the other side of the top of the cooling tower, and a high-efficiency water receiver 4 is arranged in the cooling tower at the lower side of the corresponding fan 1; a metal heat exchanger 2 is arranged on one side, corresponding to the first air inlet 501, in the middle part of the cooling tower, a water inlet 201 and a water outlet 202 are arranged on the metal heat exchanger 2, a first spray pipe assembly 701 is arranged between the metal heat exchanger 2 and the first air inlet 501, a heat insulation humidifying assembly 6 is arranged between the first spray pipe assembly 701 and the first air inlet 501, a PVC packing 3 is arranged on the other side, corresponding to the fan 1 and the high-efficiency water receiver 4, in the middle part of the cooling tower, and a second spray pipe assembly 702 is arranged between the PVC packing 3 and the high-efficiency water receiver 4; the side surface of the lower part of the cooling tower is provided with an air inlet; the bottom of the cooling tower is provided with a water tray 9, the outlet of the water tray 9 is connected with a spray water pump 8 through a pipeline, the spray water pump 8 is connected with a first spray pipe assembly 701 and a second spray pipe assembly 702 in parallel through a pipeline, and an electric switch valve 12 is arranged on the pipeline connecting the spray water pump 8 with the second spray pipe assembly 702; the water tray 9 is also connected with a water supplementing port 13 through a pipeline, and a ball float valve 10 is arranged on the pipeline connecting the water supplementing port 13 with the water tray 9; the water supplementing port 13 is also connected with the heat insulation and humidification assembly 6 through a pipeline, and an electric regulating valve 11 is arranged on the pipeline connecting the water supplementing port 13 with the heat insulation and humidification assembly 6.
Wherein the adiabatic humidifying assembly 6 comprises a plurality of adiabatic humidifying devices. The first and second showerhead assemblies 701, 702 each include a plurality of showers and a plurality of showerheads disposed on the showers. The opening degree of the electric switching valve 12 is 0 ° or 90 °. The opening degree of the electric control valve 11 is between 0 ° and 90 °.
Further, the air inlets on the side of the lower part of the cooling tower comprise a second air inlet 502, a third air inlet 503 and a fourth air inlet 504. The first air inlet 501, the second air inlet 502, the third air inlet 503, and the fourth air inlet 504 function: the air of the first air inlet 501 passes through the metal heat exchanger 2 and cools the internal circulating water inside the metal heat exchanger 2; the air at the second air inlet 502, the third air inlet 503 and the fourth air inlet 504 passes through the PVC packing 3 to cool the external circulating water of the water tray 9; the air sucked by the first air inlet 501, the second air inlet 502, the third air inlet 503 and the fourth air inlet 504 is mixed after passing through the metal heat exchanger 2 and the PVC filler 3, and the mixed air is discharged out of the cooling tower through the fan 1 after being water-collected by the high-efficiency water collector 4.
Preferably, the metal heat exchanger 2 and the PVC packing 3 are arranged in parallel horizontally. Compared with the prior downstream cooling tower or cross flow cooling tower technology, the cooling tower has the advantages of reduced height, reduced occupied area and greatly optimized application of the internal space. When the cooling tower runs in summer, part of the external circulating water in the water tray 9 is sprayed to the metal heat exchanger 2 to cool the internal circulating water, and the other part of the external circulating water is sprayed to the PVC packing 3 to cool, so that the internal space of the cooling tower is fully utilized. When the PVC packing 3 runs in winter, the second spray pipe assembly 702 above the PVC packing 3 stops working, and the PVC packing 3 is prevented from being frozen and collapsed. The PVC filler 3 of the existing cooling tower technology has spray water when running in winter, the problem of easy freezing and collapsing in winter affects the use of the concurrent cooling tower and the cross-flow cooling tower, the counter-flow cooling tower can overcome the problem of freezing of the PVC filler 3 when being applied to severe cold areas in winter due to the fact that the PVC filler 3 is not used, but the heat exchanger is made of metal materials, so that the cost is greatly increased, and therefore, the counter-flow cooling tower can overcome the problem of freezing and collapsing of the PVC filler 3 in the existing concurrent cooling tower technology and the cross-flow cooling tower technology, and also can overcome the problem of overhigh cost of the counter-flow cooling tower, and belongs to the optimized technical scheme.
The combined type water-saving airtight cooling tower can be operated in the following modes from high to low according to the ambient temperature, namely a combined cooling mode, a spray cooling mode, an adiabatic cooling mode and a dry cooling mode.
Under the composite cooling mode, the fan 1, the spray water pump 8 and the electric switch valve 12 are opened, the electric control valve 11 is closed, the external circulating water in the water tray 9 is conveyed to the first spray pipe assembly 701 and the second spray pipe assembly 702 through the spray water pump 8, the spray water is sprayed to the metal heat exchanger 2 and the PVC filler 3, the spray water sprayed by the first spray pipe assembly 701 directly cools the internal circulating water in the metal heat exchanger 2 in summer, the temperature of the external circulating water is high in hot summer, the temperature of the external circulating water rises after heat exchange on the surface of the metal heat exchanger 2, the dry bulb temperature of the environment is higher than the temperature in the water tray 9, and part of the external circulating water is sprayed to the PVC filler 3 through the second spray pipe assembly 702 to be further cooled, so that the heat exchange capacity is enhanced.
The fan 1 and the spray water pump 8 are started in the spray cooling mode, the electric switch valve 12 and the electric regulating valve 11 are closed, the external circulating water in the water tray 9 is conveyed to the first spray pipe assembly 701 through the spray water pump 8 and sprayed to the metal heat exchanger 2 for cooling, the temperature of the external circulating water in the water tray 9 is lower than the temperature of the ambient air, the heat dissipation of the external circulating water in the water tray 9 to the environment is low, and further cooling through the PVC packing 3 is not needed, otherwise, the ineffective evaporation of the external circulating water can be increased.
The spray water pump 8 and the electric switch valve 12 are closed in the adiabatic cooling mode, the fan 1 and the electric control valve 11 are opened, the water replenishing of the water replenishing port 13 is conveyed to the adiabatic humidifying assembly 6 after passing through the electric control valve 11, the adiabatic humidifying assembly 6 carries out adiabatic humidification on the air of the first air inlet 501 and then passes through the metal heat exchanger 2, the internal circulating water in the metal heat exchanger 2 is cooled, particles of the adiabatic humidified water are small, the evaporative cooling effect is good, the ineffective evaporation is less, the water saving characteristic is obvious, if the environmental temperature continuously drops in the adiabatic cooling mode, the opening of the electric control valve can be adjusted, the adiabatic humidifying water quantity is reduced, the water consumption is further reduced, and the electric control valve is closed completely.
In the dry cooling mode, the spray water pump 8, the electric switch valve 12 and the electric regulating valve 11 are closed, the fan 1 is started, the internal circulating water inside the metal heat exchanger 2 is cooled by the sucked air, the cooling capacity is increased, and the consumption of water is not needed.
Referring to a comparison diagram of heat-insulating humidifying water particles and spray water particles shown in fig. 5, in a heat-insulating cooling mode, atomized water particles sprayed by a heat-insulating humidifying device are less than 100um and are uniformly arranged in a gap of a heat exchange tube of a metal heat exchanger 2, a thin water film is formed on the surface, air is easy to evaporate and absorb heat after passing through the surface, the water film is thin, the air is rapidly cooled, more effective evaporation of water is used for cooling, less ineffective water is evaporated, and the water consumption rate in the heat-insulating humidifying cooling mode is about 0.5% of the internal circulating water; in the spray cooling mode, the spray water quantity is large, water columns with diameters of about 2-6 cm are formed through the heat exchange tubes of the metal heat exchanger 2, gaps among the heat exchange tubes are large and uneven in water particles, the water films on the outer surfaces of the heat exchange tubes are thicker, after air passes through the heat exchange tubes, ineffective evaporation of water is more, effective water evaporation quantity for cooling is less, and the water consumption rate is about 1.5% of the internal circulation water quantity. In addition, in the composite cooling mode, the PVC filler 3 is external circulating water cooling, does not directly participate in internal circulating water cooling, and has larger evaporation water quantity which is about 2% of the internal circulating water quantity. The adiabatic cooling mode is mainly water evaporation cooling, and no flowing water film is wrapped on the surface of a heat exchange tube of the metal heat exchanger 2, so that no heat conduction cooling is realized; in the spray cooling mode, if the outer circulation water temperature is lower than the inner circulation water temperature, the surface of the heat exchange tube can be cooled through heat conduction of a water film besides evaporative cooling, the cooling capacity is strong, and the water consumption is large. In summary, although the cooling capacity of the adiabatic cooling mode is slightly weaker than that of the spray cooling mode, the water-saving characteristic is good, so that the adiabatic humidifying cooling mode is mainly used when the combined type water-saving airtight cooling tower is operated, and the other cooling modes are auxiliary.
Referring to fig. 7, the metal heat exchanger comprises a control system 14, a water supply temperature sensor 1401 is arranged at a water inlet 201 of the metal heat exchanger 2, a water return temperature sensor 1403 is arranged at a water outlet 202, a temperature and humidity sensor 1402 is arranged at a second air inlet 502, a third air inlet 503 and a fourth air inlet 504, and the fan 1, the electric regulating valve 11, the electric switching valve 12, the temperature sensor and the temperature and humidity sensor 1402 are all connected to the control system 14 and controlled by the control system 14. The control system 14 determines a cooling load and a cooling capacity according to temperature values measured by the temperature and humidity sensor 1402, the water supply temperature sensor 1401, and the return water temperature sensor 1403, and automatically adjusts an operation mode. If the temperature value is lower than the lower deviation of the set temperature of the cooling mode, the first-stage cooling mode grade is reduced, and if the temperature value is higher than the upper deviation of the set temperature of the cooling mode, the first-stage cooling mode grade is increased, so that the water outlet temperature of the metal heat exchanger 2 is kept constant, and ineffective water consumption is reduced.
When the PVC packing 3 runs in winter, the second spray pipe assembly 702 above the PVC packing 3 stops working, and the PVC packing 3 is prevented from being frozen and collapsed. The PVC filler 3 of the existing cooling tower technology has spray water when running in winter, the problem of easy freezing and collapsing in winter affects the use of the concurrent cooling tower and the cross-flow cooling tower, the counter-flow cooling tower can overcome the problem of freezing of the PVC filler 3 when being applied to severe cold areas in winter due to the fact that the PVC filler 3 is not used, but the heat exchanger is made of metal materials, so that the cost is greatly increased, and therefore, the counter-flow cooling tower can overcome the problem of freezing and collapsing of the PVC filler 3 in the existing concurrent cooling tower technology and the cross-flow cooling tower technology, and also can overcome the problem of overhigh cost of the counter-flow cooling tower, and belongs to the optimized technical scheme.
In practical applications, taking Shanghai as an example, the ambient temperature in annual operation is relatively short in hot and cold periods, the transition season time is long, the ambient temperature is higher than 26 ℃ and operates in a composite cooling mode, about 45 days, the temperature is between 20 and 26 ℃ and operates in a spray cooling mode, about 64 days, the temperature is between 5 and 20 ℃ and operates in an adiabatic cooling mode, about 231 days, the temperature is lower than 5 ℃ and operates in a dry cooling mode, and about 25 days, so that the consumption of external circulating water can be greatly reduced, and the method is specifically shown in table 1.
TABLE 1
| Composite cooling mode | Spray cooling mode | Adiabatic cooling mode | Dry cooling mode | |
| Dry bulb temperature transition point | 26℃ | 24℃ | 20.3℃ | 3℃ |
| Operating state | 26℃<T | 20℃<T≤26℃ | 5℃<T≤20℃ | T≤5℃ |
| Days (days) | 45 days | For 64 days | 231 days | 25 days |
It should be noted that numerous variations and modifications are possible in light of the fully described invention, and are not limited to the specific examples of implementation described above. The above-described embodiments are merely illustrative of the present invention and are not intended to be limiting. In general, the scope of the present invention should include those variations or alternatives and modifications apparent to those skilled in the art.
Claims (4)
1. The combined type water-saving closed cooling tower is characterized in that a first air inlet is formed in one side of the top of the cooling tower, a fan is arranged on the other side of the top of the cooling tower, and a high-efficiency water receiver is arranged at the lower side of the corresponding fan in the cooling tower;
a metal heat exchanger is arranged on one side, corresponding to the first air inlet, in the middle part of the cooling tower, a water inlet and a water outlet are arranged on the metal heat exchanger, a first spray pipe assembly is arranged between the metal heat exchanger and the first air inlet, a heat insulation and humidification assembly is arranged between the first spray pipe assembly and the first air inlet, PVC filler is arranged on the other side, corresponding to the fan and the high-efficiency water receiver, in the middle part of the cooling tower, and a second spray pipe assembly is arranged between the PVC filler and the high-efficiency water receiver;
the adiabatic humidification assembly includes a plurality of adiabatic humidification devices; the first spray pipe assembly and the second spray pipe assembly comprise a plurality of spray pipes and a plurality of spray heads arranged on the spray pipes;
the side surface of the lower part of the cooling tower is provided with an air inlet, and the air inlet comprises a second air inlet, a third air inlet and a fourth air inlet;
a water tray is arranged at the bottom of the cooling tower, a spray water pump is connected to an outlet of the water tray through a pipeline, the spray water pump is connected with the first spray pipe assembly and the second spray pipe assembly in parallel through pipelines, and an electric switch valve is arranged on a pipeline connecting the spray water pump with the second spray pipe assembly;
the water tray is also connected with a water supplementing port through a pipeline, and a ball float valve is arranged on the pipeline connected with the water tray; the water supplementing port is also connected with the heat insulation and humidification assembly through a pipeline, and an electric regulating valve is arranged on the pipeline connected with the heat insulation and humidification assembly;
the metal heat exchanger is characterized by further comprising a control system, wherein a water inlet of the metal heat exchanger is provided with a water supply temperature sensor, a water outlet of the metal heat exchanger is provided with a water return temperature sensor, temperature and humidity sensors are arranged at a second air inlet, a third air inlet and a fourth air inlet, and the fan, the electric regulating valve, the electric switching valve, the water supply temperature sensor, the water return temperature sensor and the temperature and humidity sensors are all connected to the control system;
the control system adjusts the cooling mode grade of the cooling tower according to the temperature values measured by the temperature and humidity sensor, the water supply temperature sensor and the water return temperature sensor, the first-stage cooling mode grade is reduced when the temperature value is lower than the lower deviation of the set temperature of the cooling mode, and the first-stage cooling mode grade is increased when the temperature value is higher than the upper deviation of the set temperature of the cooling mode;
the cooling mode grade of the cooling tower is respectively from high to low according to the ambient temperature:
in the composite cooling mode, a fan, a spray water pump and an electric switch valve are opened, an electric regulating valve is closed, external circulating water in a water tray is conveyed to a first spray pipe assembly and a second spray pipe assembly through the spray water pump, and spray water is sprayed to a metal heat exchanger and PVC filler;
in the spray cooling mode, a fan and a spray water pump are started, an electric switch valve and an electric regulating valve are closed, and external circulating water in a water tray is conveyed to a first spray pipe assembly through the spray water pump and sprayed to a metal heat exchanger for cooling;
in the heat-insulating cooling mode, a spray water pump and an electric switch valve are closed, a fan and an electric regulating valve are opened, water replenishing at a water replenishing port is conveyed to a heat-insulating humidifying assembly after passing through the electric regulating valve, and the heat-insulating humidifying assembly carries out heat-insulating humidifying on air at a first air inlet and then passes through a metal heat exchanger, so that internal circulating water inside the metal heat exchanger is cooled; and
in the dry cooling mode, the spray water pump, the electric switch valve and the electric regulating valve are closed, the fan is opened, and the internal circulating water inside the metal heat exchanger is cooled by the sucked air.
2. The combined type water-saving closed type cooling tower according to claim 1, wherein the opening degree of the electric switching valve is 0 ° or 90 °, and the opening degree of the electric regulating valve is 0 ° to 90 °.
3. The composite water-saving closed cooling tower according to claim 1, wherein the metal heat exchanger and PVC packing are horizontally juxtaposed.
4. The composite water conservation containment cooling tower of claim 1 wherein the second spray tube assembly above the PVC packing ceases to operate during winter operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810045536.3A CN108036657B (en) | 2018-01-17 | 2018-01-17 | Combined type water-saving closed cooling tower and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810045536.3A CN108036657B (en) | 2018-01-17 | 2018-01-17 | Combined type water-saving closed cooling tower and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108036657A CN108036657A (en) | 2018-05-15 |
| CN108036657B true CN108036657B (en) | 2023-07-25 |
Family
ID=62096338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810045536.3A Active CN108036657B (en) | 2018-01-17 | 2018-01-17 | Combined type water-saving closed cooling tower and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108036657B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111174604A (en) * | 2020-03-06 | 2020-05-19 | 隆华科技集团（洛阳）股份有限公司 | Closed cooling tower capable of saving water, saving energy and eliminating white fog |
| US20210404675A1 (en) * | 2020-06-29 | 2021-12-30 | Alfa Laval Corporate Ab | Wet surface air cooler with counter current direct heat exchange section |
| CN113390138B (en) * | 2021-05-14 | 2022-05-17 | 苏州科技大学 | Spray device with built-in dry-wet integrated filler |
| CN114018070B (en) * | 2021-11-12 | 2023-06-16 | 芜湖凯博环保科技股份有限公司 | Cooling tower capable of adjusting water-saving mode according to seasonal environmental temperature |
| CN115839629A (en) * | 2023-02-14 | 2023-03-24 | 厦门铭光能源科技有限公司 | Plate-type ultrathin film evaporative cooler |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09257379A (en) * | 1996-03-25 | 1997-10-03 | Takasago Thermal Eng Co Ltd | Air-conditioner facility and method for operating the same |
| CN101398260A (en) * | 2008-09-17 | 2009-04-01 | 绍兴舜风水处理科技有限公司 | Closed cooling tower |
| CN101788173A (en) * | 2010-01-22 | 2010-07-28 | 西安工程大学 | Spray air cooler and packless spray cooling tower combined high temperature water chiller |
| CN205593402U (en) * | 2016-05-10 | 2016-09-21 | 洛阳隆华传热节能股份有限公司 | Union type circulative cooling system open - closes |
| CN106052418A (en) * | 2016-06-29 | 2016-10-26 | 淄博环能海臣环保技术服务有限公司 | On-off switchable air cooling and water cooling composite cooling tower for air cooling radiator and operation mode |
| CN206037754U (en) * | 2016-07-30 | 2017-03-22 | 山东蓝想环境科技股份有限公司 | Accuse temperature water conservation fog dispersal device |
| CN107166989A (en) * | 2017-06-22 | 2017-09-15 | 扬州大学 | A kind of adjusting method of dry and wet joint dual-cooled multi-state transverse flow enclosed cooling tower and its operational mode |
| CN207751360U (en) * | 2018-01-17 | 2018-08-21 | 酷仑冷却技术（上海）有限公司 | A kind of water-saving hermetic type cooling tower of combined type |
-
2018
- 2018-01-17 CN CN201810045536.3A patent/CN108036657B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09257379A (en) * | 1996-03-25 | 1997-10-03 | Takasago Thermal Eng Co Ltd | Air-conditioner facility and method for operating the same |
| CN101398260A (en) * | 2008-09-17 | 2009-04-01 | 绍兴舜风水处理科技有限公司 | Closed cooling tower |
| CN101788173A (en) * | 2010-01-22 | 2010-07-28 | 西安工程大学 | Spray air cooler and packless spray cooling tower combined high temperature water chiller |
| CN205593402U (en) * | 2016-05-10 | 2016-09-21 | 洛阳隆华传热节能股份有限公司 | Union type circulative cooling system open - closes |
| CN106052418A (en) * | 2016-06-29 | 2016-10-26 | 淄博环能海臣环保技术服务有限公司 | On-off switchable air cooling and water cooling composite cooling tower for air cooling radiator and operation mode |
| CN206037754U (en) * | 2016-07-30 | 2017-03-22 | 山东蓝想环境科技股份有限公司 | Accuse temperature water conservation fog dispersal device |
| CN107166989A (en) * | 2017-06-22 | 2017-09-15 | 扬州大学 | A kind of adjusting method of dry and wet joint dual-cooled multi-state transverse flow enclosed cooling tower and its operational mode |
| CN207751360U (en) * | 2018-01-17 | 2018-08-21 | 酷仑冷却技术（上海）有限公司 | A kind of water-saving hermetic type cooling tower of combined type |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108036657A (en) | 2018-05-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108036657B (en) | Combined type water-saving closed cooling tower and control method thereof | |
| CN108105898B (en) | Adiabatic closed cooling system for data center and cooling method thereof | |
| CN203068706U (en) | Water sheet fresh air system used for cooling and energy saving of machine room and base station | |
| CN105135572B (en) | The heat pipe combined recovery type evaporative cooling air conditioning system of data center | |
| CN103712477B (en) | Heat pump heat supply demist water-saving cooling tower | |
| CN205065912U (en) | Heat pipe - heat recovery type evaporative cooling air -conditioning system suitable for data center | |
| CN109855219A (en) | Integral type based on mechanical refrigeration evaporates cooling-condensation water cooler | |
| CN203672184U (en) | Heat pump heat-supply mist-removal water-saving type cooling tower | |
| CN211792609U (en) | Indirect evaporative cooling air conditioning unit for data center | |
| CN105135739A (en) | Multifunctional heat pump type evaporative condensing air-conditioning unit | |
| CN108626836A (en) | A kind of air energy heat pump recuperation of heat has both the dedicated fresh air unit of humidification function | |
| CN104613574A (en) | Independent temperature and humidity control type air conditioning system based on energy gradient utilization | |
| CN109855218A (en) | Integrated enclosed evaporates cooling-condensation water cooler | |
| CN201497089U (en) | Evaporative condensing computer room air conditioner | |
| CN111295084A (en) | Indirect evaporative cooling air conditioning unit using condenser and evaporator | |
| CN209763378U (en) | Air conditioning unit based on combination of evaporative cooling and mechanical refrigeration | |
| CN105276735A (en) | Evaporative cooling-mechanical refrigerating combined air conditioning system utilizing subway tunnel to radiate | |
| CN213687078U (en) | Cooling system for data center machine room | |
| CN209588260U (en) | A kind of enclosed evaporation cooling-condensation water cooler of combination mechanical refrigeration | |
| CN102003913A (en) | Method for saving water and preventing fog and icing of evaporative heat-exchange device and filler assembly | |
| CN208785783U (en) | A kind of steam energy latent heat feedback solution concentration systems | |
| CN208382439U (en) | A kind of grain depot evaporating condensation type air-conditioner set | |
| WO2018000774A1 (en) | Opening and closing switchable air-cooled cool water-type machine cooling tower for air-cooled radiator and operating mode of same | |
| CN204678572U (en) | Based on evaporative cooling and heat pipe, heat pump united air-conditioner set | |
| CN207751360U (en) | A kind of water-saving hermetic type cooling tower of combined type |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |