Indirect air cooling tower and cooling system

Abstract

The invention relates to the technical field of cooling equipment, and discloses an indirect air cooling tower and a cooling system.The indirect air cooling tower is used for cooling circulating water in a condenser and 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 the air supply mechanism is arranged in the tower body. A water inlet of the water conveying assembly is communicated with the 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, and the water conveying assembly extends in the air duct in the air supply direction of the air supply mechanism in a reciprocating and penetrating mode. The indirect air cooling tower is high in circulating water cooling efficiency, the evaporation capacity of circulating water can be reduced, and water resources can be saved.

Description

Technical Field

[0001] The invention relates to the field of circulating water cooling, in particular to an indirect air cooling tower, and further to a cooling system. Background Art

[0002] The cold end system is an important part of the power plant unit system. Most of the cold end systems of power plants are air cooling systems, including direct air cooling systems and indirect air cooling systems. The direct air cooling system sprays hot water directly on the cooling tower and uses the heat exchange between water and air to reduce the temperature. The indirect air cooling system achieves cooling through the heat exchange between cooling water and cooling gas.

[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 cost, 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 the related technology, a condenser is added to condense the exhaust steam of the steam turbine into water. The water-cooled surface condenser is mainly composed of a shell, a tube bundle, a hot well, a water chamber, etc. The exhaust steam of the steam turbine enters the shell through the throat, condenses into water on the cooling tube bundle and collects in the hot well, and is pumped out by a condensate pump.

[0005] With regard to the above-mentioned related technologies, the operating back pressure of the condenser will increase sharply in the non-heating season, especially in the high-temperature season in summer. The condenser cannot quickly cool the circulating water to a recyclable temperature for recycling, which will affect the overall operating efficiency of the power plant unit system. Summary of the invention

[0006] The purpose of the present invention is to overcome the problem in the prior art that the condenser cannot quickly cool the circulating water in the high temperature season, and to provide an indirect air cooling tower, which has the effect of quickly cooling the high-temperature circulating water obtained by liquefaction of the condenser through the indirect air cooling tower.

[0007] In order to achieve the above-mentioned purpose, the present invention provides an indirect air-cooling tower on the one hand, which is used to cool the circulating water in the condenser, and includes a tower body, a water delivery component and an air supply mechanism. An air duct is formed in the tower body, and the water delivery component can be inserted into the air duct. The water inlet of the water delivery 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, and the water delivery component extends back and forth in the air duct along the air supply direction of 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, and the cooling tube bundle extends back and forth in the air duct along the air supply direction of the air supply mechanism.

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

[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 drivingly connected to the fan to drive the fan to rotate and supply air, and the driver is a water 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 transmission shaft 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 output shaft of the driver.

[0014] Preferably, the air supply mechanism further includes a shutter and a control unit, wherein the shutter is arranged on the lower outer wall of the tower body in a surrounding manner, the shutter connects the tower body and the external space, and the control unit is configured to be able 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 shutter facing the inside of the tower body and is capable of cooling the air passing through the liquid cooling tube bundle.

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

[0017] Through the above technical scheme, the indirect air-cooling tower provided by the first aspect of the present invention first condenses the circulating medium by the condenser, and the 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, thereby quickly absorbing heat from the circulating water and improving the cooling efficiency.

[0018] Through the above technical scheme, 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, then the high-temperature circulating medium is passed into an indirect air-cooling tower for cooling, so as 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 schematic diagram of the structure of the indirect air cooling tower in this application; Figure 2 is a cross-sectional view of an indirect air cooling tower in the present application; Figure 3 It is a schematic diagram of the structure of the liquid cooling tube bundle in this application; Figure 4 It is a schematic diagram of the structure of the driver, transmission shaft reducer and fan in this application; Figure 5 It is a schematic diagram of the connection between the turbine and the water inlet header in this application; Figure 6 It is a schematic diagram of the connection between the cooling system and the steam turbine in this application (A is the steam turbine, B is the condenser, and C is the indirect cooling tower).

[0020] Description of Reference Numerals 1. Tower body; 2. Water delivery assembly; 21. Water inlet pipe; 22. Water outlet pipe; 23. Manifold group; 231. Water inlet manifold; 232. Water outlet manifold; 233. Intermediate 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

[0021] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or a connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be abutment, it can be the internal connection of two elements, or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] It should be understood that the directions or positional relationships indicated by the terms "outside", "inside", etc. are based on the directions or positional relationships shown in the 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.

[0024] The present invention provides an indirect air cooling tower, referring to Figures 1 to 6 , including 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. The water inlet of the water delivery component 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 and cannot be directly recycled, it enters the tower body 1 through the water delivery component 2, and the air supply mechanism 3 can send 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 delivery component 2 and the air are non-contact heat transfer. The heat in the circulating water is continuously transferred to the outside air, which can make the circulating water cool down quickly. At the same time, the circulating water only circulates in the water delivery component 2, which can reduce the possibility of waste of water resources caused by large-scale evaporation of the circulating water.

[0025] Reference Figure 2 The water delivery 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 in the air duct, and the end of the cooling tube bundle 24 away from the inlet pipe 21 is connected to the outlet pipe 22. The outlet pipe 22 extends outward through the tower body 1. The circulating water enters the cooling tube bundle 24 along the inlet pipe 21 from the water outlet of the condenser 4. 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 to save water resources while cooling the circulating water.

[0026] Reference Figure 2In order to improve the cooling effect of the indirect air-cooling tower on the circulating water, the water delivery component 2 is reciprocatingly extended and penetrated in the air duct along the air supply direction of the air supply mechanism 3, which can not only increase the contact area between the water delivery component 2 and the air, but also make the circulating water spend more time flowing through the water delivery component 2. Specifically, the water delivery component 2 also includes a header group 23, which is composed of an inlet header 231 and an outlet header 232. Specifically, the inlet header 231 and the outlet header 232 are both arranged at the lower part of the tower body 1, and the inlet pipe 21 is connected to the inlet header 231, the outlet pipe 22 is connected to the outlet header 232, and the intermediate header 233 is arranged at the upper part of the tower body 1. The cooling tube bundle 24 is connected between the inlet header 231 and the intermediate header 233 and between the intermediate header 233 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 intermediate header 233 along the cooling tube bundle 24, and then enters the water outlet header 232 along the cooling tube bundle 24 and flows out from the water outlet pipe 22, forming a double flow. The header group 23 is set so that the circulating water flows from the lower part of the tower body 1 to the upper part of the tower body 1 and then from the upper part of the tower body 1 to the lower part of the tower body 1, forming a double flow, which increases the cooling time of the circulating water in the tower body 1. And the circulating water needs to fill the water inlet header 231 before it can flow along the cooling tube bundle 24 to the intermediate header 233. Compared with the circulating water flowing directly along the cooling tube bundle 24, the flow rate of the circulating water can be effectively slowed down to extend the time of heat transfer between the circulating water and the air in the air duct, which helps to improve the cooling effect.

[0027] In order to further 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 bent tube, and each section of the cooling tube bundle 24 is bent and extended back and forth in a direction perpendicular to the axial direction of the air duct. This design can increase the contact area between the cooling tube bundle 24 and the air, and at the same time allow more circulating water to be in the air duct, which can improve the efficiency of circulating water transferring heat to the air and help improve cooling efficiency.

[0028] Reference Figure 2 and Figure 3The air supply mechanism 3 includes a plurality of shutters 35 and a corresponding control unit 36, wherein the shutters 35 are arranged around the lower outer wall of the tower body 1, and the shutters 35 connect the tower body 1 and the external space, that is, the outside air can pass through the shutters 35 into the tower body 1, and the control unit 36 ​​is installed on the shutters 35, and the control unit 36 ​​can control the opening of the shutters 35 to control the size of the air flow in the air duct in accordance with the flow rate of the circulating water. In order to reduce the situation in which the air temperature entering through the shutters 35 is too high to cool the circulating water due to the high air temperature in the hot season, a liquid cooling tube bundle 37 is provided on the side of the shutters 35 facing the inside of the tower body 1, and the liquid cooling tube bundle 37 is suitable for passing the recycled condensed water, and the liquid cooling tube bundle 37 is composed of a cooling triangle (which is the prior art). When the air with a higher temperature enters the shutters 35, the liquid cooling tube bundle 37 with the condensed water flowing therein is suitable for absorbing the heat in the air, so as to reduce the temperature of the air flow entering the tower body 1 and flowing in the air duct, thereby ensuring the cooling effect on the circulating water.

[0029] 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 louver 35 through the fan 32, and 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.

[0030] Reference Figure 5 In one embodiment, the circulating water can directly enter the water inlet manifold 231 through the water inlet pipe 21. At this time, the driver 31 is a motor, and the driver 31 directly drives the fan 32 to rotate.

[0031] Reference Figure 3 and Figure 4In another embodiment, the circulating water can also be introduced into the driver 31 as the power source of the driver 31. Specifically, the driver 31 is a water turbine (the prior art). One section of the water inlet pipe 21 is connected to the water inlet of the water turbine as the driver 31, and the other section of the water inlet pipe 21 is connected to the water outlet of the water turbine as the driver 31 and the water inlet header 231. After the circulating water enters the water turbine as the driver 31 along the water inlet pipe 21, the water turbine 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 water turbine as the driver 31 and flows into the water inlet header 231 along the water inlet pipe 21. This allows the fan 32 to rotate by the potential energy of the circulating water, which can save energy. The larger 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 and a large amount of circulating water for heat transfer, so that the indirect air cooling tower has an automatic adjustment function.

[0032] 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. The transmission shaft 33 is connected between the output end of the driver 31 and the reducer 34. The reducer 34 is connected to the fan 32 in a transmission manner. The reducer 34 plays a role in matching the rotation speed and transmitting torque between the driver 31 and the fan 32. It can increase the output torque by reducing the rotation speed, and reduce the inertia of the load, so as to better drive the fan 32 to rotate.

[0033] In summary, an indirect air-cooling tower of the present invention has the following advantages: the condenser 4 first condenses the steam into circulating water, and then the circulating water enters the driver 31 along the water inlet pipe 21, and the driver 31 converts the energy of the circulating water flow into mechanical energy, and drives the fan 32 to rotate through the transmission shaft 33 and the reducer 34. After passing through the driver 31, the circulating water enters the water inlet manifold 231, and flows along the cooling tube bundle 24 and the water outlet manifold 232 in sequence, and flows out of the tower body 1 through the water outlet pipe 22. The fan 32 blows the air from the bottom to the top, so that a pressure difference is generated inside and outside 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 flowing air, thereby improving the cooling effect. The condenser 4 and the tower body 1 are combined to perform cooling together, which can improve the cooling efficiency of the circulating water.

[0034] The present invention 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.

[0035] 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 an indirect air cooling tower for cooling; in high temperature seasons, the circulating water obtained by condensing steam through the condenser 4 has a high temperature 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.

[0036] 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 in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0037] 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. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0038] In addition, 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), wherein 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 connected to the condenser (4); The air supply mechanism (3) is provided at one end of the air duct so as to supply air into the air duct via the air supply mechanism (3); the water delivery component (2) extends reciprocatingly through the air duct along the air supply direction of 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); and the cooling tube bundle (24) is reciprocatingly extended and arranged in the air duct along the air supply direction of the air supply mechanism (3).

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 a water inlet header (231), an intermediate header (233) and a water outlet header (232), the water inlet header (231) and the water outlet header (232) are both arranged at the lower part of the tower body (1), the water inlet pipe (21) is connected to the water inlet header (231), and the water outlet pipe (22) is connected to the water outlet header (232); The intermediate header (233) is arranged at the upper part of the tower body (1), and the intermediate header (233) is connected between the water inlet header (231) and the water outlet header (232) through the cooling tube bundle (24).

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 transmission-connected to 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 comprises 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 an output shaft of the driver (31), and the other end of the transmission shaft (33) 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 comprises 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 output shaft of the driver (31).

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

9. The indirect air cooling tower according to claim 8, characterized in that: The air supply mechanism (3) further comprises a liquid cooling tube bundle (37) which is arranged on a side of the shutter (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 condenser (4), characterized in that: The indirect air-cooling tower comprises any one of claims 1 to 9, wherein the condenser (4) is connected to a steam turbine to condense steam in the steam turbine, and the tower body (1) 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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