Indirect air cooling tower and cooling system

Abstract

The utility model relates to the technical field of cooling towers, and discloses an indirect air cooling tower and a cooling system.The indirect air cooling tower comprises a tower body, a water conveying assembly and an air supply mechanism, an air duct is formed in the tower body, the water conveying assembly can be arranged in the air duct in a penetrating mode, and a water inlet of the water conveying assembly is communicated with a condenser; the air supply mechanism is arranged at one end of the air duct so that air can be supplied into the air duct through the air supply mechanism. Under the condition that the cooling effect on the circulating water is guaranteed, the circulating water only circulates in the water conveying assembly and conducts non-contact heat transfer with the air, the situation that a large amount of circulating water evaporates can be reduced, and water resources can be saved.

Description

Technical Field

[0001] The utility model relates to the technical field of cooling towers, in particular to an indirect air cooling tower, and further relates to a cooling system. Background Art

[0002] The cold-end system is a crucial component of a power plant's unit system. Most cold-end systems are air-cooled, including direct and indirect air-cooling systems. Direct air-cooling systems spray hot water directly onto cooling towers, utilizing heat exchange between water and air to lower the temperature. Indirect air-cooling systems, on the other hand, achieve cooling through heat exchange between cooling water and cooling air.

[0003] As the ambient temperature rises, the operating back pressure of the air-cooled unit system is high, which not only increases the coal consumption for power generation and increases the operating costs, but also increases the steam consumption of the turbine, resulting in an increase in the boiler load and the operating load of the boiler's auxiliary equipment. All related equipment is in an over-capacity operating state, and the unit's operating safety is reduced.

[0004] In related technologies, a "dry-wet combined cooling system" is used to divert part of the hot water to a newly added peak cooler, and then an open-loop cooling system of a mechanical ventilation cooling tower is used for cooling, so as to reduce the back pressure of the unit during summer operation and improve the unit's operating economy.

[0005] Regarding the above-mentioned related technologies, open mechanical ventilation cooling towers collect hot water into rivers, and then guide the water in the rivers into use as cooling water, which consumes a large amount of water. Closed mechanical ventilation cooling towers spray circulating water on the filler to exchange heat with the air, and a large amount of water vapor evaporates. Therefore, it is difficult to implement in water-scarce areas and the effect is not good in hot seasons. Utility Model Content

[0006] The purpose of the utility model is to overcome the problem of huge water consumption of mechanical ventilation cooling towers in the prior art and to provide an indirect air cooling tower, which has the function of ensuring the cooling effect of circulating water while saving water resources.

[0007] In order to achieve the above-mentioned purpose, the first aspect of the present invention provides an indirect air-cooling tower for cooling the circulating water in the condenser, comprising a tower body, a water supply component and an air supply mechanism, an air duct is formed in the tower body, the water supply component can be passed through the air duct, and the water inlet of the water supply component is connected to the condenser; the air supply mechanism is provided at one end of the air duct to supply air into the air duct via the air supply mechanism.

[0008] Preferably, the water delivery assembly includes a water inlet pipe, a water outlet pipe and a cooling tube bundle, one end of the cooling tube bundle is connected to the water inlet pipe, and the other end is connected to the water outlet pipe.

[0009] Preferably, the water delivery assembly includes a header group, which includes an inlet header and an outlet header. The inlet header is arranged at the lower part of the tower body, and the inlet pipe is connected to the inlet header. The outlet header is arranged at the upper part of the tower body, and the outlet pipe is connected to the outlet header. The cooling tube bundle is connected between the inlet header and the outlet header.

[0010] Preferably, the cooling tube bundle is a bent tube, and each section of the cooling tube bundle bends and extends back and forth in a direction perpendicular to the axial direction of the air duct.

[0011] Preferably, the air supply mechanism includes a driver and a fan, the driver is in driving connection with the fan to drive the fan to rotate and supply air, and the driver is a turbine.

[0012] Preferably, the air supply mechanism further includes a transmission shaft, the driver is arranged on the outside of the tower body, one end of the transmission shaft is transmission-connected to the output shaft of the driver, and the other end of the driver is transmission-connected to the fan.

[0013] Preferably, the air supply mechanism further includes a reducer, one end of the transmission shaft is conventionally connected to the output shaft of the driver, the other end of the transmission shaft is transmission-connected to the reducer, and the reducer is transmission-connected to the fan.

[0014] Preferably, the air supply mechanism further includes a shutter and a control unit, wherein the shutter is arranged around the lower outer wall of the tower body, the shutter connects the tower body and the external space, and the control unit is configured to control the opening of the shutter.

[0015] Preferably, the air supply mechanism further comprises a liquid cooling tube bundle, which is arranged on a side of the louver facing the interior of the tower body and is capable of cooling the air passing through the liquid cooling tube bundle.

[0016] The second aspect of the present invention provides a cooling system for cooling the circulating medium in a steam turbine, comprising the indirect air-cooling tower and the condenser described in the above technical solution, wherein the condenser is connected to the steam turbine to condense the steam in the steam turbine, and the indirect air-cooling tower is selectively connected to the condenser so as to be able to be connected to the condenser when the ambient temperature is higher than a preset temperature, and to be disconnected from the condenser when the ambient temperature is lower than or equal to the preset temperature.

[0017] Through the above technical solution, in the indirect air-cooling tower provided by the first aspect of the present invention, circulating water enters the water delivery component from the condenser, the water delivery component is arranged in the tower body, and the air supply mechanism supplies air to the air duct in the tower body to form an air flow in the tower body. The circulating water performs non-contact heat transfer with the air in the water delivery component, which can reduce the situation where the circulating water evaporates in large quantities with the air and reduce the waste of water resources.

[0018] Through the above technical solution, the cooling system provided by the second aspect of the present invention is that in seasons with lower temperatures, the circulating medium in the steam turbine enters the condenser, and is condensed into liquid after heat transfer with the outside world. The circulating medium can then be recycled, and the absorbed heat can also be used for heating; in seasons with higher temperatures, the circulating medium in the steam turbine enters the condenser, and the temperature is still high after condensation and liquefaction, so the high-temperature circulating medium is passed into an indirect air-cooling tower for cooling to reduce the adverse effects of the high-temperature circulating medium on the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the indirect air cooling tower in this application;

[0020] Figure 2 is a cross-sectional view of the indirect air cooling tower in this application;

[0021] Figure 3 It is a schematic diagram of the structure of the liquid cooling tube bundle in this application;

[0022] Figure 4 It is a schematic diagram of the structure of the driver, transmission shaft reducer and fan in this application;

[0023] Figure 5 It is a schematic diagram of the connection between the turbine and the water inlet header in this application;

[0024] Figure 6 This is a schematic diagram of the connection between the cooling system and the steam turbine in this application, where A is the steam turbine, B is the condenser, and C is the indirect cooling tower.

[0025] Description of Reference Numerals

[0026] 1. Tower body; 2. Water delivery assembly; 21. Water inlet pipe; 22. Water outlet pipe; 23. Manifold assembly; 231. Water inlet manifold; 232. Water outlet manifold; 24. Cooling tube bundle; 3. Air supply mechanism; 31. Driver; 32. Fan; 33. Drive shaft; 34. Reducer; 35. Shutter; 36. Control unit; 37. Liquid-cooling tube bundle; 4. Condenser. DETAILED DESCRIPTION

[0027] The following is a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0028] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the term "connection" should be understood in a broad sense. For example, it can mean a fixed connection, a detachable connection, or a connection; it can mean a direct connection, an indirect connection through an intermediate medium, abutment, internal communication between two elements, or an interaction between two elements. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0029] It should be understood that the terms "outside", "inside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] The utility model provides an indirect air cooling tower, referring to Figures 1 to 6 The tower body 1 includes a water supply assembly 2 and an air supply mechanism 3. An air duct is formed in the tower body 1. The water supply assembly 2 can be installed in the air duct. The water inlet of the water supply assembly 2 is connected to the condenser 4. An air supply mechanism 3 is provided at one end of the air duct to supply air into the air duct via the air supply mechanism 3. When the temperature of the circulating water condensed and liquefied in the condenser 4 is too high to be directly recycled, it enters the tower body 1 through the water supply assembly 2. The air supply mechanism 3 can supply air into the air duct in the tower body 1. Driven by the air supply mechanism 3, the air forms an airflow in the air duct. The circulating water in the water supply assembly 2 and the air conduct non-contact heat transfer. The heat in the circulating water is continuously transferred to the outside air, which can quickly cool the circulating water. At the same time, the circulating water only circulates in the water supply assembly 2, which can reduce the possibility of large-scale evaporation of circulating water and causing waste of water resources.

[0031] Reference Figure 1The water supply assembly 2 includes an inlet pipe 21, an outlet pipe 22, and a cooling tube bundle 24. One end of the inlet pipe 21 is connected to the water outlet of the condenser 4, and the other end of the inlet pipe 21 is connected to the cooling tube bundle 24. The cooling tube bundle 24 is placed inside the tower body 1 and is also arranged in the air duct. The end of the cooling tube bundle 24 away from the inlet pipe 21 is connected to the outlet pipe 22, and the outlet pipe 22 extends outward through the tower body 1. Circulating water flows from the water outlet of the condenser 4 along the inlet pipe 21 into the cooling tube bundle 24. When flowing in the cooling tube bundle 24, the airflow in the air duct exchanges heat with the high-temperature circulating water in the cooling tube bundle 24. The heat in the circulating water is continuously absorbed by the flowing air. At the same time, the cooling tube bundle 24, as a closed pipeline, can reduce the evaporation of the circulating water, which helps save water resources while cooling the circulating water.

[0032] In order to improve the cooling effect of the indirect air cooling tower on the circulating water, Figure 2 As shown, the cooling tube bundle 24 can be multiple strands, and the cooling tube bundle 24 is a curved tube. Each section of the cooling tube bundle 24 bends back and forth in a direction perpendicular to the axial direction of the air duct. This design increases the contact area between the cooling tube bundle 24 and the air, while allowing more circulating water to flow into the air duct. This improves the efficiency of the circulating water in transferring heat to the air, thereby enhancing cooling efficiency.

[0033] Reference Figure 2 In order to further improve the cooling effect of the indirect air-cooling tower on the circulating water, the water delivery component 2 also includes a header group 23, which consists of an inlet header 231 and an outlet header 232. Specifically, the inlet header 231 is arranged at the lower part of the tower body 1, and the inlet pipe 21 is connected to the inlet header 231, and the outlet header 232 is arranged at the upper part of the tower body 1. At the same time, the outlet pipe 22 is connected to the outlet header 232, and the cooling tube bundle 24 is connected between the inlet header 231 and the outlet header 232. Therefore, after the circulating water enters the water inlet pipe 21, it first enters the water inlet header 231, then enters the water outlet header 232 along the cooling tube bundle 24 and flows out from the water outlet pipe 22. The header group 23 is arranged so that the circulating water flows from the lower part of the tower body 1 to the upper part of the tower body 1. When flowing, it needs to overcome its own gravity, and the circulating water needs to first fill the water inlet header 231 before it can flow along the cooling tube bundle 24 to the water outlet header 232. Compared with the circulating water flowing from the upper part of the tower body 1 to the lower part of the tower body 1, the flow rate of the circulating water can be effectively slowed down, so as to prolong the time for the circulating water to transfer heat with the air in the air duct, which helps to improve the cooling effect.

[0034] Reference Figure 2 and Figure 3The air supply mechanism 3 includes a plurality of louvers 35 and a corresponding control unit 36. The louvers 35 are arranged around the lower outer wall of the tower body 1. The louvers 35 connect the tower body 1 with the outside world, allowing outside air to enter the tower body 1 through the louvers 35. The control unit 36 ​​is mounted on the louvers 35 and is capable of controlling the opening of the louvers 35 to adjust the airflow within the air duct in accordance with the flow rate of the circulating water. To mitigate the situation in which the air entering through the louvers 35 is too hot to cool the circulating water due to high air temperatures during hot weather, a liquid cooling tube bundle 37 is provided on the side of the louvers 35 facing the interior of the tower body 1. The liquid cooling tube bundle 37 is adapted to flow recycled condensed water, forming a cooling triangle (conventional technology). When the hot air enters the louvers 35, the condensed water flowing through the liquid cooling tube bundle 37 absorbs heat from the air, thereby reducing the temperature of the air flowing through the air duct into the tower body 1 and ensuring a cooling effect on the circulating water.

[0035] Reference Figure 3 The air supply mechanism 3 also includes a driver 31 and a fan 32, wherein the fan 32 is arranged in the tower body 1, and the fan 32 is placed on the upper part of the tower body 1, and the fan 32 is coaxially arranged with the tower body 1. When the fan 32 rotates, it is suitable for forming an airflow in the air duct that is blown out of the tower body 1 through the fan 32 by the shutter 35. The driver 31 is connected to the fan 32 through the transmission shaft 33, which allows the driver 31 to be arranged outside the tower body 1 to reduce the space occupied by the driver 31 in the tower, so that the blades of the fan 32 do not need to be shortened due to protecting the driver 31, thereby increasing the size of the airflow driven by the fan 32.

[0036] Reference Figure 5 Circulating water can directly enter the water inlet manifold 231 through the water inlet pipe 21. In this case, the driving source is a motor. Alternatively, the circulating water can be passed into the driver 31 as the power source of the driver 31. Specifically, the driver 31 is a turbine (which is a prior art). One section of the water inlet pipe 21 is connected to the water inlet of the turbine serving as the driver 31, and the other section of the water inlet pipe 21 is connected to the water outlet of the turbine serving as the driver 31 and the water inlet manifold 231. Figure 3 and Figure 4After the circulating water enters the turbine serving as the driver 31 along the water inlet pipe 21, the turbine serving as the driver 31 converts the energy of the circulating water flow into rotational mechanical energy and transmits it to the fan 32 through the transmission shaft 33, thereby driving the fan 32 to rotate. Subsequently, the circulating water flows out from the water outlet of the turbine serving as the driver 31 and flows into the water inlet manifold 231 along the water inlet pipe 21. This allows the fan 32 to rotate driven by the potential energy of the circulating water, thereby saving energy. The greater the amount of circulating water, the greater the mechanical energy generated, and the faster the fan 32 rotates, which can generate a stronger airflow to drive more air to transfer heat with a large amount of circulating water, so that the indirect air cooling tower has an automatic adjustment function.

[0037] In order to improve the functions of the driver 31 and the fan 32, the air supply mechanism 3 also includes a reducer 34. The reducer 34 is arranged in the tower body 1, and the transmission shaft 33 is connected between the output end of the driver 31 and the reducer 34. The reducer 34 is in transmission connection with the fan 32. The reducer 34 plays the role of matching the speed and transmitting torque between the driver 31 and the fan 32. It can increase the output torque by reducing the speed and reduce the inertia of the load, so as to better drive the fan 32 to rotate.

[0038] In summary, the indirect air-cooling tower of the present invention has the following advantages: Circulating water from the condenser 4 enters the driver 31 along the water inlet pipe 21. The driver 31 converts the energy of the circulating water into mechanical energy and drives the fan 32 to rotate via the drive shaft 33 and reducer 34. After passing through the driver 31, the circulating water enters the water inlet header 231, flows sequentially along the cooling tube bundle 24 and the water outlet header 232, and exits the tower body 1 through the water outlet pipe 22. The fan 32 blows air from the bottom to the top, causing a pressure difference between the inside and outside of the tower body 1. The external air is cooled by the liquid cooling tube bundle 37 under the suction force generated by the pressure difference, and then an airflow is generated, which is blown out of the tower body 1 from the louver 35 toward the fan 32. The air in the airflow absorbs the heat of the circulating water in the water delivery component 2 and then enters the external air for heat dissipation. This ensures the cooling effect of the circulating water while allowing the circulating water to flow only inside the water delivery component 2 and perform non-contact heat transfer with the air, thereby reducing the situation where a large amount of evaporation occurs due to direct contact between the circulating water and the air, thereby helping to save water resources.

[0039] The utility model also provides a cooling system, referring to Figure 5 and Figure 6 , used to cool the circulating medium in the steam turbine, including an indirect air cooling tower and a condenser 4. The condenser 4 is connected to the steam turbine to condense the steam in the steam turbine. The indirect air cooling tower is selectively connected to the condenser 4 so that it can be connected to the condenser 4 when the ambient temperature is higher than the preset temperature, and disconnected from the condenser 4 when the ambient temperature is lower than or equal to the preset temperature.

[0040] In summary, a cooling system of the present invention has the following advantages: in low temperature seasons, steam can be condensed into circulating water that can be directly recycled through the condenser 4. At this time, the heat absorbed by the condenser 4 can also be used for heating, so there is no need to pass the circulating water into the indirect air cooling tower for cooling; in high temperature seasons, the temperature of the circulating water obtained by condensing the steam through the condenser 4 is relatively high and cannot be directly recycled. At this time, the circulating water is passed into the indirect air cooling tower for cooling, so that the circulating water can be quickly cooled for use.

[0041] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the scope of protection of the present invention.

[0042] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0043] In addition, the various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. An indirect air cooling tower for cooling circulating water in a condenser (4), characterized in that: It comprises a tower body (1), a water delivery component (2) and an air supply mechanism (3); an air duct is formed in the tower body (1); the water delivery component (2) can be inserted into the air duct; and the water inlet of the water delivery component (2) is in communication with the condenser (4); One end of the air duct is provided with the air supply mechanism (3) for supplying air into the air duct via the air supply mechanism (3).

2. The indirect air cooling tower according to claim 1, characterized in that The water delivery assembly (2) comprises a water inlet pipe (21), a water outlet pipe (22) and a cooling tube bundle (24); one end of the cooling tube bundle (24) is connected to the water inlet pipe (21), and the other end is connected to the water outlet pipe (22).

3. The indirect air cooling tower according to claim 2, characterized in that The water delivery assembly (2) comprises a header group (23), the header group (23) comprising an inlet header (231) and an outlet header (232), the inlet header (231) being arranged at the lower portion of the tower body (1), the inlet pipe (21) being connected to the inlet header (231), the outlet header (232) being arranged at the upper portion of the tower body (1), the outlet pipe (22) being connected to the outlet header (232), and the cooling tube bundle (24) being connected between the inlet header (231) and the outlet header (232).

4. The indirect air cooling tower according to claim 3, characterized in that The cooling tube bundle (24) is a bent tube, and each section of the cooling tube bundle (24) bends and extends back and forth in a direction perpendicular to the axial direction of the air duct.

5. The indirect air cooling tower according to claim 1, characterized in that The air supply mechanism (3) comprises a driver (31) and a fan (32). The driver (31) is in transmission connection with the fan (32) to drive the fan (32) to rotate and supply air. The driver (31) is a water turbine.

6. The indirect air cooling tower according to claim 5, characterized in that: The air supply mechanism (3) further includes a transmission shaft (33), the driver (31) is arranged outside the tower body (1), one end of the transmission shaft (33) is transmission-connected to the output shaft of the driver (31), and the other end of the driver (31) is transmission-connected to the fan (32).

7. The indirect air cooling tower according to claim 6, characterized in that: The air supply mechanism (3) further includes a reducer (34), one end of the transmission shaft (33) is conventionally connected to the output shaft of the driver (31), the other end of the transmission shaft (33) is transmission-connected to the reducer (34), and the reducer (34) is transmission-connected to the fan (32).

8. The indirect air cooling tower according to claim 1, characterized in that: The air supply mechanism (3) further includes a shutter (35) and a control unit (36), wherein the shutter (35) is arranged around the lower outer wall of the tower body (1), the shutter (35) connects the tower body (1) and the external space, and the control unit (36) is configured to control the opening of the shutter (35).

9. The indirect air cooling tower according to claim 8, characterized in that: The air supply mechanism (3) further includes a liquid cooling tube bundle (37), which is arranged on a side of the louver (35) facing the interior of the tower body (1) and is capable of cooling air passing through the liquid cooling tube bundle (37).

10. A cooling system for cooling a circulating medium in a steam turbine, characterized in that: The indirect air-cooling tower comprises the indirect air-cooling tower according to any one of claims 1 to 9 and a condenser (4), wherein the condenser (4) is connected to a steam turbine to condense steam in the steam turbine, and the indirect air-cooling tower is selectively connected to the condenser (4) so ​​as to be connected to the condenser (4) when the ambient temperature is higher than a preset temperature, and disconnected from the condenser (4) when the ambient temperature is lower than or equal to the preset temperature.

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