Cooling tower combining natural ventilation and mechanical ventilation

Abstract

The utility model discloses a natural ventilation and mechanical ventilation combined cooling tower, which relates to the technical field of industrial circulating water cooling and comprises a natural ventilation tower body, a cooling tower body and a cooling tower body, the dry-cold sector comprises a dry-cold heat exchanger, a dry-cold shutter and a second seal; the mechanical ventilation wet-cooling units are distributed corresponding to the dry-cooling sectors, and each mechanical ventilation wet-cooling unit comprises a wet-cooling heat exchanger, a fan, a first air door and a second air door; the circulating water main pipe comprises a circulating water inlet main pipe and a circulating water outlet main pipe, the water inlet pipe of the dry cooling sector is connected with the circulating water inlet main pipe, and the water outlet pipe of the mechanical ventilation wet cooling unit is connected with the circulating water outlet main pipe; and a control device. The device has the characteristics of low investment of mechanical ventilation wet cooling, high summer high-temperature cooling capacity and energy-saving and water-saving natural ventilation dry cooling, realizes the annual energy-saving, water-saving and consumption reduction of a cooling system, and has better anti-freezing, safe and stable operation performance in winter.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial circulating water cooling, and more particularly to a cooling tower combining natural ventilation with mechanical ventilation. Background Art

[0002] Industrial production processes generate significant amounts of heat, which is dissipated through circulating water cooling. Traditional circulating water cooling uses wet cooling or closed-loop evaporative cooling, relying on water evaporation to remove heat, which consumes significant amounts of water resources. As water resources become increasingly scarce and water prices rise, industrial enterprises, driven by their own economic benefits, are increasingly adopting air cooling technology for industrial circulating water. In particular, air cooling technology is widely used in the construction of thermal power plants in my country's water-scarce Three North regions, achieving significant water savings of over 90%.

[0003] However, a limitation of air cooling technology is that the cooling efficiency decreases significantly under high temperature conditions in summer. For thermal power plants, the increase in cooling water temperature sacrifices coal combustion efficiency, resulting in increased energy consumption. In most other industrial fields that have strict requirements on circulating water cooling water temperature, it cannot meet the operating requirements of industrial equipment.

[0004] In recent years, new industrial projects have increasingly adopted combined dry-wet cooling technology for circulating water cooling. This technology uses wet cooling for high summer temperatures, low water consumption in spring and autumn, and zero water consumption for low winter temperatures, thereby conserving water. Currently, combined dry-wet cooling technology relies on mechanical ventilation. To achieve the same cooling water temperature, air-cooled towers require significantly more fan power than wet-cooled towers. This saves water but consumes significant amounts of electricity, resulting in higher total operating costs over the economical operating period.

[0005] Nowadays, natural ventilation indirect air cooling technology is increasingly being used in the construction of thermal power plants in northern China. This technology eliminates fan power consumption, saves water, and reduces electricity consumption. However, northern my country is both water-scarce and extremely cold. The lower the ambient temperature in winter, the greater the temperature difference between the inside and outside of the natural ventilation tower, which increases the tower's draft. Controlling ventilation volume by closing the shutters can lead to partial over-freezing of the air-cooled radiator tubes due to varying shutter openings. This affects the continuous, safe, stable, and economical operation of the unit and is a common problem in existing units.

[0006] In the prior art, there is a naturally ventilated dry-wet combined cooling tower, which discloses a technical solution for a naturally ventilated dry-wet combined cooling tower that can compensate for the high summer water outlet temperature of dry cooling towers while saving electricity. However, in the above technical solution, natural ventilation is also used during summer wet cooling operation. Due to the small temperature difference between the wet-bulb temperature and the circulating water temperature in summer, the temperature rise of the air inside and outside the tower is small, and the suction force is insufficient. The ventilation volume cannot meet the cooling requirements, and the configuration scale of the wet cooling part and the scale of the natural ventilation tower need to be expanded, resulting in the disadvantage of excessive initial investment. At the same time, the disadvantage of naturally ventilated dry cooling, that is, "the problem of partial over-freezing of the air-cooled radiator due to different shutter openings" is not solved.

[0007] In summary, how to combine the low investment and strong cooling capacity of mechanical ventilation wet cooling in high temperature in summer with the energy-saving and water-saving characteristics of natural ventilation dry cooling, make full use of natural cold sources, achieve energy-saving, water-saving and consumption-reducing cooling systems throughout the year, and at the same time have better winter antifreeze, safe and stable operation performance, is a problem that currently needs to be solved urgently by technical personnel in this field. Utility Model Content

[0008] In view of this, the purpose of the present invention is to provide a cooling tower that combines natural ventilation and mechanical ventilation, which has the characteristics of low investment and strong cooling capacity of high temperature in summer of mechanical ventilation wet cooling and energy saving and water saving of natural ventilation dry cooling, and makes maximum use of natural cold sources to achieve energy saving, water saving and consumption reduction of the cooling system throughout the year, while having better anti-freeze, safe and stable operation performance in winter.

[0009] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0010] A cooling tower combining natural ventilation and mechanical ventilation, comprising:

[0011] Natural ventilation tower;

[0012] Dry cooling sectors, at least two of which are vertically arranged around the periphery of the air inlet at the lower portion of the natural ventilation tower body, each of which comprises a dry cooling heat exchanger, a dry cooling louver provided on the outside of the dry cooling heat exchanger, and a second closure, wherein the inner side of the second closure is connected to the lower edge of the dry cooling louver;

[0013] Mechanically ventilated wet cooling units are distributed corresponding to the dry cooling sectors and are arranged around the periphery of the lower portion of the dry cooling sectors. Each of the mechanically ventilated wet cooling units includes a wet cooling heat exchanger, a fan arranged on the upper portion of the wet cooling heat exchanger, a first damper, and a second damper. The first damper is located on the lower outer side of the wet cooling heat exchanger, the second damper is located on the lower inner side of the wet cooling heat exchanger, and the second closed outer side is connected to the inner edge of the upper end of the mechanically ventilated wet cooling unit.

[0014] A circulating water main pipe, comprising a circulating water inlet main pipe and a circulating water outlet main pipe, wherein the water inlet pipe of the dry cooling sector is connected to the circulating water inlet main pipe, the water outlet pipe of the dry cooling sector is connected to the water inlet pipe of the mechanical ventilation and wet cooling unit, and the water outlet pipe of the mechanical ventilation and wet cooling unit is connected to the circulating water outlet main pipe;

[0015] A control device, wherein the first damper, the second damper, the fan and the dry cooling shutter are all connected to the control device.

[0016] In one embodiment, the dry cooling sector further includes a first control valve group, and the mechanical ventilation wet cooling unit further includes a second control valve group. Both the first control valve group and the second control valve group are connected to the control device to adjust the circulating water flow path.

[0017] In one embodiment, a first pipeline is connected to a circulating water inlet of the dry cooling sector, a second pipeline is connected to a circulating water outlet of the dry cooling sector, and the first control valve group includes a first inlet valve connected in series to the first pipeline and a first outlet valve connected in series to the second pipeline;

[0018] The third pipeline is connected to the circulating water inlet of the mechanical ventilation and wet cooling unit, the fourth pipeline is connected to the circulating water outlet of the mechanical ventilation and wet cooling unit, and the second control valve group includes a second inlet valve connected in series to the third pipeline and a second outlet valve connected in series to the fourth pipeline;

[0019] One end of the first pipeline and the second pipeline away from the dry cooling sector, and one end of the third pipeline and the fourth pipeline away from the mechanical ventilation wet cooling unit are connected in parallel to the fifth pipeline;

[0020] The first control valve group further includes a first bypass valve connected in series to the fifth pipeline, and the first bypass valve is located between the first pipeline and the second pipeline. The second control valve group further includes a second bypass valve connected in series to the fifth pipeline, and the second bypass valve is located between the third pipeline and the fourth pipeline.

[0021] One end of the water inlet pipe of the dry cooling sector is connected to the side of the fifth pipeline close to the first pipeline, and the other end is connected to the circulating water inlet main pipe. One end of the water outlet pipe of the mechanical ventilation wet cooling unit is connected to the side of the fifth pipeline close to the fourth pipeline, and the other end is connected to the circulating water outlet main pipe.

[0022] In one embodiment, the natural ventilation tower body comprises a concrete tower or a steel structure tower.

[0023] In one embodiment, the dry cooling shutters are shutters with adjustable opening;

[0024] The fan includes a variable frequency controlled fan, a dual speed controlled fan or an industrial frequency controlled fan;

[0025] The first damper includes a shutter type damper or an air inlet grille type damper;

[0026] The second damper includes a fixed closed partition or an openable damper.

[0027] In one embodiment, the openable damper comprises a shutter-type damper or a rolling shutter-type damper.

[0028] In one embodiment, the wet-cooling heat exchanger includes a heat exchanger that operates dry without spraying water or a heat exchanger that operates wet with spraying water.

[0029] In one embodiment, the natural ventilation tower body includes a closed tower section, an air inlet support section for supporting the closed tower section, and a first closed;

[0030] The first closed outer side is connected to the inner edge of the upper end of the dry cooling sector, and the first closed inner side is connected to the lower edge of the closed tower section.

[0031] When using the cooling tower that combines natural ventilation and mechanical ventilation provided by the present invention, the control device can open or close / stop the first damper, the second damper, the fan and the dry cooling shutters through different combinations to control different air flow paths to provide an air cooling source for the dry cooling heat exchanger and / or the wet cooling heat exchanger.

[0032] For example, the first air flow path is achieved by closing / stopping the second damper and the fan, and opening or partially opening the dry cooling louvers. The air outside the tower flows through the dry cooling louvers, the dry cooling heat exchanger, and the interior of the natural ventilation tower body, and is discharged from the top of the natural ventilation tower body. The first air flow path is suitable for the dry natural ventilation operation mode.

[0033] The second air flow path is achieved by closing the dry cooling louvers and the second damper, and opening or partially opening the first damper and the fan. The air outside the tower flows through the first damper, the wet cooling heat exchanger and the fan, and is discharged from the outlet of the fan 302. The second air flow path is suitable for the wet mechanical ventilation operation mode;

[0034] The third air flow path is achieved by closing the second damper and opening or partially opening the first damper, fan and dry cooling louver. The air outside the tower flows through the first damper, wet cooling heat exchanger and fan, and is discharged from the fan outlet and then merged with the air outside the natural ventilation tower body. The air then flows through the dry cooling louver, dry cooling heat exchanger, and the inside of the natural ventilation tower body, and is discharged from the top of the natural ventilation tower body. The third air flow path is suitable for dry and wet combined operation mode or winter warming and antifreeze operation mode.

[0035] When the second damper is an openable damper, it can also be the fourth air flow path. The fourth air flow path is realized by closing the dry cooling shutters and opening the first damper, the second damper and the fan. The air inside and outside the natural ventilation tower body flows through the first damper and the second damper respectively, and then merges to flow through the wet cooling heat exchanger and the fan, and is discharged from the outlet of the fan. The fourth air flow path is suitable for the wet mechanical ventilation operation mode, realizing the double-sided air intake of the mechanical ventilation wet cooling unit, increasing the ventilation volume of the mechanical ventilation wet cooling unit, thereby improving the peak cooling performance during the high temperature period in summer, or reducing the air inlet height of the mechanical ventilation wet cooling unit, reducing investment.

[0036] When the second damper is an openable damper, it can also be a fifth air flow path. The fifth air flow path is achieved by shutting down the fan, opening or partially opening the dry cooling louvers and the second damper, and closing or opening the first damper. The first air outside the natural ventilation tower flows through the dry cooling louvers and the dry cooling heat exchanger to enter the interior of the natural ventilation tower body, and the second air outside the natural ventilation tower flows through the fan, the wet cooling heat exchanger and the second damper to enter the interior of the natural ventilation tower body; or flows through the first damper and the second damper to enter the interior of the natural ventilation tower body. The first air and the second air are mixed inside the natural ventilation tower body and discharged from the top of the natural ventilation tower body. The fifth air flow path is suitable for the dry natural ventilation winter low-temperature and low-load anti-freezing operation mode. By controlling the flow rate of the second air, the mixed temperature with the first air in the natural ventilation tower body is adjusted, thereby adjusting the suction force of the natural ventilation tower body. When the opening of the dry cooling louver is small and is no longer within the adjustable air volume range, the flow rate of the first air is further adjusted to meet the water temperature control requirements outside the natural ventilation tower body.

[0037] When the first damper is a closable damper and the second damper is an openable damper, a sixth air flow path can also be created. This sixth air flow path is achieved by closing the first damper and opening or partially opening the dry cooling louvers, the second damper, and the fan. The air outside the natural ventilation tower and the air at the fan outlet merge, flowing through the dry cooling louvers and the dry cooling heat exchanger before entering the natural ventilation tower. It then flows back through the second damper, the wet cooling heat exchanger, and the fan, and then merges with the air outside the natural ventilation tower after being discharged from the top of the natural ventilation tower. This sixth air flow path is suitable for winter warming and antifreeze operation. By circulating warming air, the inlet air temperature of the dry cooling heat exchanger is increased, facilitating safe antifreeze operation.

[0038] To sum up, the cooling tower provided by the present invention, which combines natural ventilation and mechanical ventilation, has the characteristics of low investment and strong cooling capacity of high temperature in summer of mechanical ventilation wet cooling and energy saving and water saving of natural ventilation dry cooling. It makes full use of natural cold sources to achieve energy saving, water saving and consumption reduction of the cooling system throughout the year, and at the same time has better anti-freeze, safe and stable operation performance in winter. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0040] Figure 1 This is a schematic structural diagram of a cooling tower that combines natural ventilation and mechanical ventilation provided by the present invention.

[0041] Figure 1 middle:

[0042] 1 is the natural ventilation tower body, 101 is the closed tower section, 102 is the air inlet support section, 103 is the first closed, 2 is the dry cooling sector, 201 is the dry cooling heat exchanger, 202 is the dry cooling shutter, 203 is the second closed, 204 is the first bypass valve, 205 is the first inlet valve, 206 is the first outlet valve, 3 is the mechanical ventilation wet cooling unit, 301 is the wet cooling heat exchanger, 302 is the fan, 303 is the first damper, 304 is the second inlet valve, 305 is the second damper, 306 is the second outlet valve, 307 is the second bypass valve, 4 is the circulating water main pipe, 401 is the circulating water outlet main pipe, and 402 is the circulating water inlet main pipe. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0044] The core of this utility model is to provide a cooling tower that combines natural ventilation and mechanical ventilation. It has the characteristics of low investment and strong cooling capacity in high temperature in summer of mechanical ventilation wet cooling and energy saving and water saving of natural ventilation dry cooling. It makes full use of natural cold sources to achieve energy saving, water saving and consumption reduction of the cooling system throughout the year, and at the same time has better anti-freeze, safe and stable operation performance in winter.

[0045] Please refer to Figure 1 , Figure 1 This is a schematic structural diagram of a cooling tower that combines natural ventilation and mechanical ventilation provided by the present invention.

[0046] This specific embodiment provides a cooling tower combining natural ventilation and mechanical ventilation, comprising:

[0047] Natural ventilation tower 1;

[0048] Dry cooling sectors 2, at least two dry cooling sectors 2 are vertically arranged around the periphery of the air inlet at the lower portion of the natural ventilation tower body 1, each dry cooling sector 2 includes a dry cooling heat exchanger 201, dry cooling louvers 202 and a second closure 203 provided on the outside of the dry cooling heat exchanger 201, and the inner side of the second closure 203 is connected to the lower edge of the dry cooling louvers 202;

[0049] The mechanical ventilation wet cooling units 3 are distributed corresponding to the dry cooling sectors 2 and are arranged around the lower periphery of the dry cooling sectors 2. Each mechanical ventilation wet cooling unit 3 includes a wet cooling heat exchanger 301, a fan 302 arranged on the upper part of the wet cooling heat exchanger 301, a first damper 303, and a second damper 305. The first damper 303 is located on the lower outer side of the wet cooling heat exchanger 301, and the second damper 305 is located on the lower inner side of the wet cooling heat exchanger 301. The outer side of the second seal 203 is connected to the upper inner edge of the mechanical ventilation wet cooling unit 3.

[0050] The circulating water main pipe 4 includes a circulating water inlet main pipe 402 and a circulating water outlet main pipe 401. The water inlet pipe of the dry cooling sector 2 is connected to the circulating water inlet main pipe 402, the water outlet pipe of the dry cooling sector 2 is connected to the water inlet pipe of the mechanical ventilation and wet cooling unit 3, and the water outlet pipe of the mechanical ventilation and wet cooling unit 3 is connected to the circulating water outlet main pipe 401;

[0051] The control device, the first damper 303, the second damper 305, the fan 302 and the dry cooling shutter 202 are all connected to the control device.

[0052] It should be noted that every two dry cooling heat exchangers 201 and one dry cooling louver 202 can form a triangular structure, arranged vertically. This device can control at least one of the two cooling sources, the dry cooling sector 2 and the mechanical ventilation wet cooling unit 3, to cool the circulating water independently or in combination, depending on the ambient temperature. In actual operation, the shape, structure, size, and type of the natural ventilation tower 1, dry cooling sector 2, mechanical ventilation wet cooling unit 3, circulating water main 4, and control device can be determined based on actual conditions and needs.

[0053] When using the cooling tower that combines natural ventilation and mechanical ventilation provided by the present invention, the control device can open or close / stop the first damper 303, the second damper 305, the fan 302 and the dry cooling louver 202 through different combinations to control different air flow paths to provide an air cooling source for the dry cooling heat exchanger 201 and / or the wet cooling heat exchanger 301.

[0054] For example, the first air flow path is realized by closing / stopping the second damper 305 and the fan 302, and opening or partially opening the dry cooling louver 202. The air outside the tower flows through the dry cooling louver 202, the dry cooling heat exchanger 201, and the interior of the natural ventilation tower body 1, and is discharged from the top of the natural ventilation tower body 1. The first air flow path is suitable for the dry natural ventilation operation mode.

[0055] The second air flow path is achieved by closing the dry cooling shutters 202 and the second damper 305, and opening or partially opening the first damper 305 and the fan 302. The air outside the tower flows through the first damper 305, the wet cooling heat exchanger 301 and the fan 302, and is discharged from the outlet of the fan 302. The second air flow path is suitable for the wet mechanical ventilation operation mode.

[0056] The third air flow path is achieved by closing the second damper 305 and opening or partially opening the first damper 303, the fan 302 and the dry cooling louver 202. The air outside the tower flows through the first damper 303, the wet cooling heat exchanger 301 and the fan 302, and is discharged from the outlet of the fan 302 and then merged with the air outside the natural ventilation tower body 1. The air then flows through the dry cooling louver 202, the dry cooling heat exchanger 201, and the inside of the natural ventilation tower body 1 and is discharged from the top of the natural ventilation tower body 1. The third air flow path is suitable for a dry and wet combined operation mode or a winter warming and antifreeze operation mode.

[0057] When the second damper 305 is an openable damper, it can also be the fourth air flow path. The fourth air flow path is realized by closing the dry cooling shutters 202 and opening the first damper 303, the second damper 305 and the fan 302. The air inside and outside the natural ventilation tower body 1 flows through the first damper 303 and the second damper 305 respectively, and then merges to flow through the wet cooling heat exchanger 301 and the fan 302, and is discharged from the outlet of the fan 302. The fourth air flow path is suitable for the wet mechanical ventilation operation mode, realizing the double-sided air intake of the mechanical ventilation wet cooling unit 3, increasing the ventilation volume of the mechanical ventilation wet cooling unit 3, thereby improving the peak cooling performance during the high temperature period in summer, or reducing the air inlet height of the mechanical ventilation wet cooling unit 3, and reducing investment.

[0058] When the second damper 305 is an openable damper, it can also be a fifth air flow path. The fifth air flow path is achieved by shutting down the fan 302, opening or partially opening the dry cooling louvers 202 and the second damper 305, and closing or opening the first damper 303. The first air flow outside the natural ventilation tower body 1 flows through the dry cooling louvers 202 and the dry cooling heat exchanger 201 to enter the interior of the natural ventilation tower body 1, and the second air flow outside the natural ventilation tower body 1 flows through the fan 302, the wet cooling heat exchanger 301 and the second damper 305 to enter the interior of the natural ventilation tower body 1; or flows through the first damper 303, the second damper 305 to enter the interior of the natural ventilation tower body 1. The second air door 305 enters the interior of the natural ventilation tower body 1, and the first air and the second air are mixed inside the natural ventilation tower body 1 and discharged from the top of the natural ventilation tower body 1. The fifth air flow path is suitable for the dry natural ventilation winter low-temperature and low-load anti-freeze operation mode. By controlling the flow rate of the second air, the mixed temperature with the first air in the natural ventilation tower body 1 is adjusted, thereby adjusting the suction force of the natural ventilation tower body 1. When the opening degree of the dry cooling shutter 202 is small and is no longer within the adjustable air volume range, the flow rate of the first air is further adjusted to meet the water temperature control requirements outside the natural ventilation tower body 1.

[0059] When the first damper 303 is a closable damper and the second damper 305 is an openable damper, a sixth air flow path can also be established. This sixth air flow path is achieved by closing the first damper 303 and opening or partially opening the dry cooling louvers 202, the second damper 305, and the fan 302. The air outside the natural ventilation tower 1 and the air at the fan 302 outlet are combined and flow through the dry cooling louvers 202 and the dry cooling heat exchanger 201, entering the natural ventilation tower 1, and then being discharged from the top of the natural ventilation tower 1. It then flows back through the second damper 305, the wet cooling heat exchanger 301, and the fan 302, and then is discharged from the fan 302 outlet before merging with the air outside the natural ventilation tower 1. The sixth air flow path is suitable for winter warming and antifreeze operation. By circulating warming air, the inlet air temperature of the dry cooling heat exchanger 201 is increased, facilitating safe antifreeze operation.

[0060] To sum up, the cooling tower provided by the present invention, which combines natural ventilation and mechanical ventilation, has the characteristics of low investment and strong cooling capacity of high temperature in summer of mechanical ventilation wet cooling and energy saving and water saving of natural ventilation dry cooling. It makes full use of natural cold sources to achieve energy saving, water saving and consumption reduction of the cooling system throughout the year, and at the same time has better anti-freeze, safe and stable operation performance in winter.

[0061] In one embodiment, dry cooling sector 2 further includes a first control valve group, and mechanical ventilation wet cooling unit 3 further includes a second control valve group. Both the first and second control valve groups are connected to a control device to adjust the circulating water flow path. In other words, the first and second control valve groups can adjust the circulating water flow path, thereby changing the location where heat exchange occurs.

[0062] In one embodiment, the first pipeline is connected to the circulating water inlet of the dry cooling sector 2, the second pipeline is connected to the circulating water outlet of the dry cooling sector 2, and the first control valve group includes a first inlet valve 205 connected in series to the first pipeline and a first outlet valve 206 connected in series to the second pipeline;

[0063] The third pipeline is connected to the circulating water inlet of the mechanical ventilation and wet cooling unit 3, the fourth pipeline is connected to the circulating water outlet of the mechanical ventilation and wet cooling unit 3, and the second control valve group includes a second inlet valve 304 connected in series to the third pipeline and a second outlet valve 306 connected in series to the fourth pipeline;

[0064] One end of the first pipeline and the second pipeline away from the dry cooling sector 2, and one end of the third pipeline and the fourth pipeline away from the mechanical ventilation wet cooling unit 3 are connected in parallel to the fifth pipeline;

[0065] The first control valve group further includes a first bypass valve 204 connected in series to the fifth pipeline, and the first bypass valve 204 is located between the first pipeline and the second pipeline. The second control valve group further includes a second bypass valve 307 connected in series to the fifth pipeline, and the second bypass valve 307 is located between the third pipeline and the fourth pipeline.

[0066] One end of the water inlet pipe of the dry cooling sector 2 is connected to the side of the fifth pipeline close to the first pipeline, and the other end is connected to the circulating water inlet main pipe 402. One end of the water outlet pipe of the mechanical ventilation wet cooling unit 3 is connected to the side of the fifth pipeline close to the fourth pipeline, and the other end is connected to the circulating water outlet main pipe 402.

[0067] It should be noted that the circulating water flow path of this device may include:

[0068] The first circulating water flow path is achieved by opening the first inlet valve 205, the first outlet valve 206, the second inlet valve 304, and the second outlet valve 306, and closing the first bypass valve 204 and the second bypass valve 307.

[0069] The second circulating water flow path, which flows from the circulating water inlet main pipe 402, through the dry cooling heat exchanger 201, and back to the circulating water outlet main pipe 401, is achieved by opening the first inlet valve 205, the first outlet valve 206, and the second bypass valve 307, and closing the second inlet valve 304, the second outlet valve 306, and the first bypass valve 204;

[0070] The third circulating water flow path starts from the circulating water inlet main pipe 402, flows through the wet-cooling heat exchanger 301, and returns to the circulating water outlet main pipe 401. It is achieved by opening the second inlet valve 304, the second outlet valve 306 and the first bypass valve 204, and closing the first inlet valve 205, the first outlet valve 206 and the second bypass valve 307.

[0071] In one embodiment, the natural ventilation tower body 1 comprises a concrete tower or a steel structure tower. The type of the natural ventilation tower body 1 can be selected according to actual conditions and actual needs during actual use.

[0072] In one embodiment, the dry cooling shutters 202 are shutters with adjustable opening;

[0073] The fan 302 includes a variable frequency controlled fan, a dual speed controlled fan or an industrial frequency controlled fan;

[0074] The first damper 303 includes a shutter-type damper or an air inlet grille-type damper. When the shutter-type damper is adopted, the first damper 303 can be a damper with a fixed opening or a damper with an adjustable opening.

[0075] The second damper 305 includes a fixed closed partition or an openable damper.

[0076] In actual use, the types of the dry cooling shutter 202 , the fan 302 , the first damper 303 and the second damper 305 may be selected according to actual conditions and needs.

[0077] In one embodiment, the openable damper includes a shutter type damper or a rolling door type damper. In actual use, the type of the openable damper can be selected according to actual conditions and actual needs.

[0078] In one embodiment, the wet-cooling heat exchanger 301 includes a heat exchanger that operates dry without spraying water or a heat exchanger that operates wet with spraying water. The operating state of the wet-cooling heat exchanger 301 can be selected according to actual conditions and needs during actual use.

[0079] In one embodiment, the natural ventilation tower body 1 includes a closed tower section 101, an air inlet support section 102 for supporting the closed tower section 101, and a first enclosure 103; the outer side of the first enclosure 103 is connected to the inner edge of the upper end of the dry cooling sector 2, and the inner side of the first enclosure 103 is connected to the lower edge of the closed tower section 101. The structure is as follows Figure 1 shown.

[0080] In order to further illustrate the cooling tower provided by the present invention that combines natural ventilation with mechanical ventilation, the control method thereof is described below, including:

[0081] Step S1: Obtain the outdoor ambient temperature Tout and set the target value Ttag for the circulating water outlet temperature;

[0082] Step S2: According to the temperature range of the outdoor ambient temperature Tout, the circulating water flow path is adjusted by controlling the first control valve group and the second control valve group, and the air flow path and flow rate are adjusted by controlling the first damper 303, the second damper 305, the fan 302 and the dry cooling shutter 202, so that the circulating water outlet temperature tends to the control target value Ttag.

[0083] In one embodiment, according to the temperature range of the outdoor ambient temperature Tout, the circulating water flow path is adjusted by controlling the first control valve group and the second control valve group, and the air flow path and flow rate are adjusted by controlling the first damper 303, the second damper 305, the fan 302, and the dry cooling louver 202, so that the circulating water outlet temperature tends to the control target value Ttag, including:

[0084] The preset ambient temperatures are T0, T1, T2, T3 and T4, and T0 <T1<T2<T3<T4;

[0085] Determine the size of Tout, Ttag, T0, T1, T2, T3 and T4;

[0086] When Tout>T4, and Tout≥Ttag, the second inlet valve 304, the second outlet valve 306 and the first bypass valve 204 are opened, the first inlet valve 205, the first outlet valve 206 and the second bypass valve 307 are closed, the dry cooling louver 202 and the second damper 305 are closed, the first damper 303 and the fan 302 are opened or partially opened, or the dry cooling louver 202 is closed, the first damper 303, the second damper 305 and the fan 302 are opened, and the wet cooling heat exchanger 301 is in a spray water wet operation state; that is, the third circulating water flow path and the second air flow path or the fourth air flow path are controlled to be selected, and the wet cooling heat exchanger 301 is in a spray water wet operation state. At this time, the system is in a wet mechanical ventilation operation mode;

[0087] When T4 ≥ Tout > T3, and Tout < Ttag, the first inlet valve 205, the first outlet valve 206, the second inlet valve 304, and the second outlet valve 306 are opened, the first bypass valve 204 and the second bypass valve 307 are closed, the second damper 305 is closed, the first damper 303, the fan 302, and the dry-cooling louver 202 are opened or partially opened, and the wet-cooling heat exchanger 301 is in a spray water wet operation state; that is, the first circulating water flow path and the third air flow path are controlled to be selected, and the wet-cooling heat exchanger 301 is in a spray water wet operation state. At this time, the system is in a dry-wet combined operation mode;

[0088] When T3 ≥ Tout > T2, the first inlet valve 205, the first outlet valve 206, and the second bypass valve 307 are opened, the second inlet valve 304, the second outlet valve 306, and the first bypass valve 204 are closed, the second damper 305 and the fan 302 are closed, and the dry cooling louvers 202 are opened or partially opened; that is, the second circulating water flow path and the first air flow path are controlled and selected. At this time, the system is in dry natural ventilation operation mode;

[0089] When T2≥Tout>T1, the first inlet valve 205, the first outlet valve 206, the second inlet valve 304 and the second outlet valve 306 are opened, and the first bypass valve 204 and the second bypass valve 307 are closed; the second damper 305 is closed, and the first damper 303, the fan 302 and the dry cooling louver 202 are opened or partially opened, or the dry cooling louver 202 is closed, and the first damper 303, the second damper 305 and the fan 302 are opened, and the wet cooling heat exchanger 301 is in a dry operation state without water spraying; that is, the first circulating water flow path and the third air flow path or the fourth air flow path are controlled to be selected, and the wet cooling heat exchanger 301 is in a dry operation state without water spraying. At this time, the system is in the winter warming and antifreeze operation mode;

[0090] When T1≥Tout>T0, the first inlet valve 205, the first outlet valve 206, the second inlet valve 304 and the second outlet valve 306 are opened, the first bypass valve 204 and the second bypass valve 307 are closed, the fan 302 is turned off, the dry cooling shutters 202 and the second damper 305 are opened or partially opened, the first damper 303 is closed or opened, and the wet cooling heat exchanger 301 is in a dry operation state without spraying water; that is, the first circulating water flow path and the fifth air flow path are controlled to be selected, and the wet cooling heat exchanger 301 is in a dry operation state without spraying water. At this time, the system is in the winter low-temperature and low-load antifreeze operation mode.

[0091] It should be noted that the first closure 103 and the second closure 203, the first damper 303 and the second damper 305, the first control valve group and the second control valve group, the first inlet valve 205 and the second inlet valve 304, the first outlet valve 206 and the second outlet valve 306, the first bypass valve 204 and the second bypass valve 307, the first pipeline and the second pipeline and the third pipeline and the fourth pipeline and the fifth pipeline and the sixth pipeline, the first air flow path and the second air flow path and the third air flow path and the fourth air flow path and the fifth air flow path and the sixth air flow path, the first circulating water flow path and the second circulating water flow path and the third circulating water flow path mentioned in the utility model, among which the first and second and the third and the fourth and the fifth and the sixth are just to distinguish the different positions and there is no order of priority.

[0092] In addition, it should be noted that the directions or positional relationships indicated by "in and out" and "up and down" in the present invention are based on the directions or positional relationships shown in the accompanying drawings, and are only for the purpose of simplifying the description and facilitating understanding, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, it cannot be understood as a limitation on the present invention.

[0093] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other. Any combination of all the embodiments provided by this utility model is within the scope of protection of this utility model and will not be described in detail here.

[0094] The above describes in detail the cooling tower that combines natural ventilation and mechanical ventilation provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above examples is only intended to help understand the method and core concept of the present invention. It should be noted that for those skilled in the art, without departing from the principles of the present invention, various improvements and modifications can be made to the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A cooling tower combining natural ventilation and mechanical ventilation, characterized in that: include: Natural ventilation tower (1); Dry cooling sectors (2), at least two of the dry cooling sectors (2) are vertically arranged around the periphery of the lower air inlet of the natural ventilation tower body (1), each of the dry cooling sectors (2) comprises a dry cooling heat exchanger (201), a dry cooling louver (202) arranged on the outside of the dry cooling heat exchanger (201), and a second closure (203), the inner side of the second closure (203) being connected to the lower edge of the dry cooling louver (202); A mechanical ventilation wet cooling unit (3), which is distributed corresponding to the dry cooling sector (2) and is arranged around the lower periphery of the dry cooling sector (2), each of the mechanical ventilation wet cooling units (3) comprises a wet cooling heat exchanger (301), a fan (302) arranged on the upper part of the wet cooling heat exchanger (301), a first damper (303) and a second damper (305), wherein the first damper (303) is located on the lower outer side of the wet cooling heat exchanger (301), the second damper (305) is located on the lower inner side of the wet cooling heat exchanger (301), and the outer side of the second closure (203) is connected to the inner edge of the upper end of the mechanical ventilation wet cooling unit (3); A circulating water main pipe (4), comprising a circulating water inlet main pipe (402) and a circulating water outlet main pipe (401), wherein the water inlet pipe of the dry cooling sector (2) is connected to the circulating water inlet main pipe (402), the water outlet pipe of the dry cooling sector (2) is connected to the water inlet pipe of the mechanical ventilation and wet cooling unit (3), and the water outlet pipe of the mechanical ventilation and wet cooling unit (3) is connected to the circulating water outlet main pipe (401); A control device, wherein the first damper (303), the second damper (305), the fan (302) and the dry cooling shutter (202) are all connected to the control device.

2. The cooling tower combining natural ventilation and mechanical ventilation according to claim 1, characterized in that: The dry cooling sector (2) further comprises a first control valve group, and the mechanical ventilation wet cooling unit (3) further comprises a second control valve group, wherein the first control valve group and the second control valve group are both connected to the control device to adjust the circulating water flow path.

3. The cooling tower combining natural ventilation and mechanical ventilation according to claim 2, characterized in that: The first pipeline is connected to the circulating water inlet of the dry cooling sector (2), the second pipeline is connected to the circulating water outlet of the dry cooling sector (2), and the first control valve group comprises a first inlet valve (205) connected in series to the first pipeline and a first outlet valve (206) connected in series to the second pipeline; The third pipeline is connected to the circulating water inlet of the mechanical ventilation and wet cooling unit (3), the fourth pipeline is connected to the circulating water outlet of the mechanical ventilation and wet cooling unit (3), and the second control valve group comprises a second inlet valve (304) connected in series to the third pipeline and a second outlet valve (306) connected in series to the fourth pipeline; One end of the first pipeline and the second pipeline away from the dry cooling sector (2), and one end of the third pipeline and the fourth pipeline away from the mechanical ventilation wet cooling unit (3) are connected in parallel to a fifth pipeline; The first control valve group further comprises a first bypass valve (204) connected in series to the fifth pipeline, and the first bypass valve (204) is located between the first pipeline and the second pipeline, and the second control valve group further comprises a second bypass valve (307) connected in series to the fifth pipeline, and the second bypass valve (307) is located between the third pipeline and the fourth pipeline; One end of the water inlet pipe of the dry cooling sector (2) is connected to the side of the fifth pipeline close to the first pipeline, and the other end is connected to the circulating water inlet main pipe (402); one end of the water outlet pipe of the mechanical ventilation wet cooling unit (3) is connected to the side of the fifth pipeline close to the fourth pipeline, and the other end is connected to the circulating water outlet main pipe (401).

4. The cooling tower combining natural ventilation and mechanical ventilation according to claim 1, characterized in that: The natural ventilation tower body (1) comprises a concrete tower or a steel structure tower.

5. The cooling tower combining natural ventilation and mechanical ventilation according to any one of claims 1 to 4, characterized in that: The dry cooling shutter (202) is a shutter of an adjustable opening type; The fan (302) includes a variable frequency controlled fan, a dual speed controlled fan or an industrial frequency controlled fan; The first damper (303) comprises a shutter-type damper or an air inlet grille-type damper; The second damper (305) comprises a fixed closed partition or an openable damper.

6. The cooling tower combining natural ventilation and mechanical ventilation according to claim 5, characterized in that: The openable damper includes a shutter-type damper or a rolling shutter-type damper.

7. The cooling tower combining natural ventilation and mechanical ventilation according to any one of claims 1 to 4, characterized in that: The wet-cooling heat exchanger (301) includes a heat exchanger that operates in a dry mode without spraying water or a heat exchanger that operates in a wet mode with spraying water.

8. The cooling tower combining natural ventilation and mechanical ventilation according to any one of claims 1 to 4, characterized in that: The natural ventilation tower body (1) comprises a closed tower section (101), an air inlet support section (102) for supporting the closed tower section (101), and a first closure (103); The outer side of the first enclosure (103) is connected to the inner edge of the upper end of the dry cooling sector (2), and the inner side of the first enclosure (103) is connected to the lower edge of the closed tower section (101).

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