Dry-wet combined closed cooling tower

Abstract

The utility model relates to the technical field of cooling towers, in particular to a dry-wet combined type closed cooling tower which comprises a water containing tank assembly, an air inlet grille, a cooling fan, a spraying pump, a coil pipe assembly, a rubber nozzle, a water collector and a finned tube assembly, the air inlet grille is installed at the upper end of the water containing tank assembly, the coil pipe assembly is installed at the upper end of the air inlet grille, and the water collector is installed at the lower end of the water containing tank assembly. The rubber nozzle is installed at the upper end of the coil pipe assembly. The rectifying device cooling system suitable for northern areas is a combination of a water cooling type cooling tower and an air cooling type cooling tower, and adopts two working conditions of a dry working condition and a wet working condition to operate; according to the working principle, when the temperature is high in summer, cooling water in the coil pipe and the finned pipe is cooled in a double cooling mode of air cooling and spraying water evaporation heat absorption, and the water cooling mode is a wet working condition; if the outdoor air temperature is reduced to a certain temperature, spraying water is closed, direct cooling is carried out in an air cooling mode, and operation is carried out in a dry working condition.

Description

Technical Field

[0001] The utility model relates to the technical field of cooling towers, in particular to a dry-wet combined closed cooling tower. Background Art

[0002] At present, cooling towers are widely used in my country, especially in the cooling system of rectifier devices, with cross-flow closed cooling towers and counter-flow closed cooling towers being the main types. Their advantages are: they use a dual cooling method of air cooling and spray water evaporation to absorb heat, resulting in high cooling efficiency; they are small in size, take up little space, are easy to move and place, and do not require the construction of a water tank; they are highly automated, widely used, and economical and environmentally friendly. In the southern region, the temperature difference throughout the year and the temperature difference between day and night are relatively stable, and the temperature is mostly above 0°C throughout the year, which is very suitable for the use of cooling towers; however, in the northern region, the winter temperature is usually between -10-20°C, which can easily cause the spray water to freeze. Even if antifreeze or insulation measures are taken, the saturated humid air at the cooling tower outlet will mix with the cold air from the outside environment and produce a large amount of white mist. The combination of mist and haze will further deteriorate the local climate environment; and once the white mist drips onto the ground and equipment, it will cause ice to form, seriously affecting the operation of the equipment, so improvements are needed. Utility Model Content

[0003] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a dry-wet combined closed cooling tower.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A dry-wet combined closed cooling tower comprises a water tank assembly, an air inlet grille, a cooling fan, a spray pump, a coil assembly, a rubber nozzle, a water collector and a fin tube assembly. The air inlet grille is mounted on the upper end of the water tank assembly, the coil assembly is mounted on the upper end of the air inlet grille, the rubber nozzle is mounted on the upper end of the coil assembly, the water collector is mounted on the upper end of the rubber nozzle, the fin tube assembly is mounted on the upper end of the water collector, the fin tube assembly and the coil assembly are connected, the cooling fan is mounted on the upper end of the fin tube assembly, a spray pump is mounted on one side of the lower end of the air inlet grille, and the spray pump and the rubber nozzle are connected;

[0006] The coil assembly is connected to a pure water pump assembly mechanism, and one side of the water tank assembly is connected to a buffer water tank mechanism.

[0007] Compared with the existing technology, the present application is suitable for the cooling system of rectifier devices in the northern region. It is a combination of water-cooled cooling towers and air-cooled cooling towers. It operates in dry and wet conditions. Its working principle is mainly to use a dual cooling method of air cooling and spray water evaporation and heat absorption to cool the cooling water in the coil and fin tube when the temperature is high in summer, and water cooling, which is wet condition operation; if the outdoor temperature drops to a certain temperature, the spray water will be turned off and air cooling will be used for direct cooling, which is dry condition operation.

[0008] Preferably, the pure water pump group mechanism includes a base frame, two main circulation water pumps, a gas-water separator, a conductivity meter, an automatic exhaust valve, two ion exchangers, an electrical cabinet, an electric contact thermometer, an electric contact pressure gauge, a temperature sensor, a pressure sensor and an automatic reversing valve;

[0009] The two main circulating water pumps are both fixed on the upper end of the base frame, the gas-water separator is connected to the two main circulating water pumps, and a water outlet is commonly installed on the two main circulating water pumps. The gas-water separator is provided with a water inlet. The two ion exchangers and the electrical cabinet are fixed on the upper end of the base frame in sequence from front to back. The conductivity meter is installed on one side of the gas-water separator, the automatic exhaust valve is installed on the upper end of the gas-water separator, and the automatic reversing valve is installed on the water outlet.

[0010] Furthermore, the pure water pump group mechanism stably outputs pure deionized water of rated temperature, pressure and flow to the main unit during operation, effectively preventing scaling and electrical corrosion in the main unit cooling water channel, and ensuring the safe and reliable operation of the main unit within the rated operating temperature.

[0011] Preferably, the electric contact temperature gauge, the electric contact pressure gauge, the temperature sensor and the pressure sensor are sequentially installed at the upper end of the water outlet from left to right.

[0012] Preferably, the buffer water tank mechanism includes a water tank support, a water tank, a water tank heater, a water tank level pipe, a water tank level controller, a water tank drain port, a water tank water filling port and an air filter;

[0013] The water tank support is fixed at the lower end of the water tank, the water tank heater is installed on one side of the lower end of the water tank, the water tank liquid level pipe is installed on one side of the water tank, the water tank liquid level controller is installed in the water tank, the water tank water inlet and air filter are installed at the upper end of the water tank, and the water tank drain outlet is installed at the lower end of the water tank.

[0014] Furthermore, the buffer water tank mechanism plays a role in protecting the host, and can effectively solve the problems of load fluctuation and frequent host startup caused by the system being too small. It mainly extends the startup time of the host, reduces the number of starts and stops of the host, protects the life of the host, can store water, ensure system stability, and facilitate system exhaust.

[0015] Preferably, the air filter is installed in the middle of the upper end of the water tank, the water tank drain is installed in the middle of the lower end of the water tank, and the water tank drain is connected to the water tank assembly.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. Due to the evaporation of water on the fin surface, the heat transfer in the tube is enhanced, and the temperature rise of the air in the coil section is reduced. The air enters the fin tube section at a lower temperature, which is also beneficial to the heat transfer of the fin tube section;

[0018] 2. In the dry and wet tube bundles of the dry-wet combined closed cooling tower, the process fluid can be condensed and cooled at one time without the need to install other intermediate cooling equipment, so that the process fluid temperature at the outlet of the coil section can be cooled to a temperature close to the ambient (dry bulb) temperature;

[0019] 3. The structure is relatively compact and occupies a small area; it saves water resources, is energy-saving and environmentally friendly; it is safe, stable, has a long service life, and is easy to maintain and repair;

[0020] 4. Effectively solve the problem of sprinkler water freezing and white mist in northern winter. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is the internal structure diagram of the utility model;

[0022] Figure 2 It is a front view of the utility model;

[0023] Figure 3 This is a side view of the pure water pump assembly mechanism of the utility model;

[0024] Figure 4 This is a front view of the pure water pump assembly mechanism of the utility model;

[0025] Figure 5 This is a top view of the pure water pump assembly mechanism of the utility model;

[0026] Figure 6 This is a front view of the buffer water tank mechanism of the utility model;

[0027] Figure 7 This is a rear view of the buffer water tank mechanism of the utility model;

[0028] In the figure: 1 water tank assembly, 2 air inlet grille, 3 cooling fan, 4 spray pump, 5 coil assembly, 6 rubber nozzle, 7 water collector, 8 fin tube assembly, 9 base frame, 10 main circulation water pump, 11 air-water separator, 12 conductivity meter, 13 automatic exhaust valve, 14 ion exchanger, 15 electrical cabinet, 16 electric contact thermometer, 17 electric contact pressure gauge, 18 temperature sensor, 19 pressure sensor, 20 automatic reversing valve, 21 water tank support, 22 water tank, 23 water tank heater, 24 water tank liquid level pipe, 25 water tank liquid level controller, 26 water tank drain outlet, 27 water tank water inlet, 28 air filter. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0030] Reference Figure 1-7 , dry-wet combined closed cooling tower, including a water tank assembly 1, an air inlet grille 2, a cooling fan 3, a spray pump 4, a coil assembly 5, a rubber nozzle 6, a water collector 7 and a fin tube assembly 8. The air inlet grille 2 is installed at the upper end of the water tank assembly 1, the coil assembly 5 is installed at the upper end of the air inlet grille 2, the rubber nozzle 6 is installed at the upper end of the coil assembly 5, the water collector 7 is installed at the upper end of the rubber nozzle 6, the fin tube assembly 8 is installed at the upper end of the water collector 7, the fin tube assembly 8 is connected to the coil assembly 5, and the cooling fan 3 is installed at the fin tube A spray pump 4 is installed at the upper end of the assembly 8 and on one side of the lower end of the air inlet grille 2. The spray pump 4 is connected to the rubber nozzle 6. The water tank assembly 1 includes an external closed cover plate and a water tank. The spray water is mainly stored in the water tank during the system circulation. An automatic water replenishment system and a heater can be installed in the water tank assembly. First, the automatic water replenishment system mainly consists of a liquid level switch and a float valve. When the spray water level falls below the alarm value, automatic water replenishment is achieved. Second, the heater is mainly used in northern winter when the temperature is low to prevent the spray water from freezing.

[0031] The main function of the air inlet grille 2 is to prevent dust outside the tower from entering the tower to pollute the water quality, and to prevent water droplets from increasing water consumption;

[0032] Cooling fan 3 plays the most basic role in the gas circulation in the cooling tower. Timely discharge of vaporized spray water in the cooling tower can reduce the temperature in the tower to the maximum extent. Reasonable selection of fan model parameters can increase cooling efficiency, reduce power consumption and spray water drift rate;

[0033] The main function of the spray pump 4 is to pump water from the water pool at the bottom of the cooling tower to the top of the cooling tower. Then, the water is sprayed on the condenser coil from the top through the spray pipe, which has the effect of cooling the condenser coil. Cooling the cooling water in the cooling tower coil is to assist the cooling tower in achieving the cooling effect in hot weather.

[0034] The coil assembly 5 is one of the important components of the cooling tower. The cooling medium flows inside the coil, and the external spray water is evenly sprayed on the surface of the cooling coil, forming a dense water film. After the water film absorbs heat and evaporates, the spray water will continue to form a water film on the surface of the coil. The excess spray water automatically flows into the water pool at the bottom.

[0035] The rubber nozzles 6 are evenly arranged on the spray pipe. When working, the rubber nozzles can spray the spray water evenly on the coil surface through the pressure in the pipe.

[0036] The primary function of the moisture collector 7 is to recover and recycle the moisture from the hot steam generated by the spray water applied to the heat exchanger. This not only reduces drift but also serves as an effective dust screen. In a combined dry-wet closed-circuit cooling tower, this moisture collection prevents the fin tubes from coming into contact with airborne vapor, which could reduce the tube's heat dissipation efficiency and service life. Furthermore, it protects the spray system from sunlight and dust contamination.

[0037] The finned tube assembly 8 has the effects of high heat exchange efficiency and large heat dissipation area. Compared with the light tube, the heat transfer area of ​​the finned tube can be increased by 2-30 times, and the heat transfer coefficient can be increased by 1-2 times. In the northern winter, after the spray water is turned off, the finned tube plays a key role in increasing the heat exchange area in the air cooling state.

[0038] Reference Figure 1-7 The coil assembly 5 is connected to a pure water pump group mechanism, which stably outputs pure water (deionized water) of rated temperature, pressure and flow to the main unit during operation, effectively preventing scaling and electrical corrosion in the cooling water channel of the main unit, and ensuring the safe and reliable operation of the main unit within the rated working temperature; a buffer water tank mechanism is connected to one side of the water tank assembly 1, which plays a role in protecting the main unit and can effectively solve the load fluctuations and frequent start-up problems of the main unit caused by the system being too small, mainly extending the start-up time of the main unit, reducing the number of starts and stops of the main unit, protecting the life of the main unit, storing water, ensuring system stability, and facilitating system exhaust.

[0039] Reference Figure 3-5The pure water pump group includes a base frame 9, two main circulating water pumps 10, an air-water separator 11, a conductivity meter 12, an automatic exhaust valve 13, two ion exchangers 14, an electrical cabinet 15, an electric contact thermometer 16, an electric contact pressure gauge 17, a temperature sensor 18, a pressure sensor 19 and an automatic reversing valve 20; the base frame 9 plays a supporting role; the main circulating water pump 10 can provide the main water system circulation power component; the air-water separator 11 can remove the air in the main water system; the conductivity meter 12 can provide the circulating water internal water quality monitoring device; the automatic The exhaust valve 13 can provide a component for exhausting system air; the ion exchanger 14 can improve and maintain the quality of the main water; the electrical cabinet 15 has an electrical control function; the electric contact thermometer 16 can provide temperature reading and monitoring signals; the electric contact pressure gauge 17 can provide pressure reading and monitoring signals; the temperature sensor 18 can provide an analog temperature output signal; the pressure sensor 19 can provide an analog pressure output signal; the automatic reversing valve 20, when water enters one end of the automatic reversing valve, the valve core moves to the other end under the action of the water pressure and closes the water inlet at the other end;

[0040] Reference Figure 3-5 The two main circulating water pumps 10 are fixed on the upper end of the base frame 9, the gas-water separator 11 is connected to the two main circulating water pumps 10, and the two main circulating water pumps 10 are jointly installed with a water outlet. The electric contact thermometer 16, the electric contact pressure gauge 17, the temperature sensor 18 and the pressure sensor 19 are installed on the upper end of the water outlet from left to right. The gas-water separator 11 is provided with a water inlet. The two ion exchangers 14 and the electrical cabinet 15 are fixed on the upper end of the base frame 9 from front to back. The conductivity meter 12 is installed on one side of the gas-water separator 11, the automatic exhaust valve 13 is installed on the upper end of the gas-water separator 11, and the automatic reversing valve 20 is installed on the water outlet.

[0041] Reference Figure 6-7 The buffer water tank mechanism includes a water tank support 21, a water tank 22, a water tank heater 23, a water tank liquid level pipe 24, a water tank liquid level controller 25, a water tank drain port 26, a water tank water filling port 27 and an air filter 28; the water tank support 21 has a supporting function; the water tank 22 has a water storage and buffering function; the water tank heater 23 can increase the temperature of the system circulating medium to prevent the main components from being damaged due to excessively low circulating water temperature in winter; the water tank liquid level height can be observed through the water tank liquid level pipe 24; the water tank liquid level controller 25 can monitor the water tank liquid level height and output signals such as low liquid level and normal liquid level; the water tank drain port 26 has a drainage function; the water tank water filling port 27 has a water filling and replenishing function; the air filter 28 has a function of filtering air and exhausting air;

[0042] The water tank support 21 is fixed to the lower end of the water tank 22, the water tank heater 23 is installed on one side of the lower end of the water tank 22, the water tank liquid level tube 24 is installed on one side of the water tank 22, the water tank liquid level controller 25 is installed in the water tank 22, the water tank water inlet 27 and the air filter 28 are installed at the upper end of the water tank 22, the water tank drain outlet 26 is installed at the lower end of the water tank 22, the air filter 28 is installed in the middle of the upper end of the water tank 22, the water tank drain outlet 26 is installed in the middle of the lower end of the water tank 22, and the water tank drain outlet 26 is connected to the water tank assembly 1.

[0043] In this utility model, the dry-wet combined closed cooling tower is based on the counter-flow closed cooling tower. A fin tube assembly 8 is installed between the water collector 7 and the cooling fan 3. The fin tube assembly 8 and the coil assembly 5 are in series. The working principle of the counter-flow closed cooling tower is to use the pressure generated by the water pump to transport the higher temperature water from the rectifier cabinet, that is, the cooling water, to the coil assembly 5. The circulating water enters the cooling tower and exchanges heat through the movement in the cooling tower and the contact with the wind flow. The return water after entering the cooling tower passes through the installation. The pressure swirl rubber nozzle 6 at the top of the tower and the upper part of the air duct forms small water droplets that move vertically downward at high speed, completing the task of increasing the surface area of ​​the water droplets. During the descent, the water droplets will also encounter rising air flow, which slows down the descent of the water particles and thus prolongs the heat exchange time. The heat of the fluid is first transferred to the inner wall of the tube, then from the inner wall to the outer wall of the tube, and then from the outer wall to the spray water film. The water film and air form saturated hot and humid steam, and the heat is discharged into the atmosphere by the cooling fan 3. A part of the water droplets is recovered by the water collector 7, reducing the loss of spray water. When the spray water is reduced to a certain amount, the float valve automatically replenishes the water, and this cycle continues. In addition, since the cooling tower adds a packing device to increase the exchange stroke, the spray water spraying time in the tower is extended. Under the action of the cooling fan 3, the air heat exchange area is increased, and the air-to-water ratio is improved, thereby achieving the purpose of improving the cooling effect.

[0044] Unlike counterflow cooling towers, dry-type combined closed cooling towers are divided into two sections: the first for dry operation and the second for wet operation. Since the air passing through the wet section becomes humid, its temperature drops to a temperature close to the humidity temperature of the air. Once entering the finned tube assembly 8, the heat transfer temperature difference increases, improving the heat transfer capacity of the finned tube assembly 8. In winter, when the temperature drops to a set value, the spray system is shut off and the spray water is completely emptied. At this point, the dry-wet combined tower becomes an air cooler, reducing water consumption and also reducing atomization at the fan outlet.

[0045] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A dry-wet combined closed cooling tower, comprising a water tank assembly (1), an air inlet grille (2), a cooling fan (3), a spray pump (4), a coil assembly (5), a rubber nozzle (6), a water collector (7) and a fin tube assembly (8), characterized in that: The air inlet grille (2) is mounted on the upper end of the water tank assembly (1), the coil assembly (5) is mounted on the upper end of the air inlet grille (2), the rubber nozzle (6) is mounted on the upper end of the coil assembly (5), the water collector (7) is mounted on the upper end of the rubber nozzle (6), the fin tube assembly (8) is mounted on the upper end of the water collector (7), the fin tube assembly (8) and the coil assembly (5) are connected, the cooling fan (3) is mounted on the upper end of the fin tube assembly (8), a spray pump (4) is mounted on one side of the lower end of the air inlet grille (2), and the spray pump (4) and the rubber nozzle (6) are connected; The coil assembly (5) is connected to a pure water pump assembly mechanism, and one side of the water tank assembly (1) is connected to a buffer water tank mechanism.

2. The dry-wet combined closed cooling tower according to claim 1, characterized in that: The pure water pump assembly mechanism comprises a base frame (9), two main circulating water pumps (10), a gas-water separator (11), a conductivity meter (12), an automatic exhaust valve (13), two ion exchangers (14), an electrical cabinet (15), an electric contact thermometer (16), an electric contact pressure gauge (17), a temperature sensor (18), a pressure sensor (19) and an automatic reversing valve (20); Two main circulating water pumps (10) are fixed on the upper end of the base frame (9), the gas-water separator (11) is connected to the two main circulating water pumps (10), a water outlet is commonly installed on the two main circulating water pumps (10), the gas-water separator (11) is provided with a water inlet, two ion exchangers (14) and an electrical cabinet (15) are fixed on the upper end of the base frame (9) in sequence from front to back, the conductivity meter (12) is installed on one side of the gas-water separator (11), the automatic exhaust valve (13) is installed on the upper end of the gas-water separator (11), and the automatic reversing valve (20) is installed on the water outlet.

3. The dry-wet combined closed cooling tower according to claim 2, characterized in that: The electric contact thermometer (16), the electric contact pressure gauge (17), the temperature sensor (18) and the pressure sensor (19) are sequentially installed at the upper end of the water outlet from left to right.

4. The dry-wet combined closed cooling tower according to claim 1, characterized in that: The buffer water tank mechanism comprises a water tank support (21), a water tank (22), a water tank heater (23), a water tank liquid level pipe (24), a water tank liquid level controller (25), a water tank drain port (26), a water tank water inlet (27) and an air filter (28); The water tank support (21) is fixed to the lower end of the water tank (22), the water tank heater (23) is installed on one side of the lower end of the water tank (22), the water tank level pipe (24) is installed on one side of the water tank (22), the water tank level controller (25) is installed in the water tank (22), the water tank water inlet (27) and the air filter (28) are installed at the upper end of the water tank (22), and the water tank drain outlet (26) is installed at the lower end of the water tank (22).

5. The dry-wet combined closed cooling tower according to claim 4, characterized in that: The air filter (28) is installed at the middle of the upper end of the water tank (22), the water tank drain (26) is installed at the middle of the lower end of the water tank (22), and the water tank drain (26) is connected to the water tank assembly (1).

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