A hyperbolic cooling tower

Abstract

The present invention discloses a hyperbolic cooling tower, in which a heat exchange structure is arranged inside the tower body. Hot medium water is supplied through the inner cavity of the heat exchange tubes of the heat exchange structure, and cooling air passes through the periphery of the heat exchange tubes of the heat exchange structure. A circumferential air inlet is arranged around the bottom of the tower body, and a plurality of groups of louvers are arranged at the circumferential air inlet. The actuating mechanism of each group of louvers is connected to a controller, and the controller is also connected to a wind speed and direction sensor, which is used to obtain the wind speed and direction of the natural wind outside the circumferential air inlet. The real-time wind speed V is compared with a preset wind speed threshold V0, and the opening and closing states of the louvers are controlled according to the comparison result: if the real-time wind speed V≥V0, the louvers on the windward side are controlled to open, and the rest of the louvers are all or partially closed; if the real-time wind speed V<V0, all the louvers are opened. The present invention can greatly reduce the energy consumption required during the cooling process in the hyperbolic cooling tower and can ensure the uniformity of the air field inside the tower.

Description

Technical Field

[0001] The present invention relates to a cooling tower, and particularly to a hyperbolic cooling tower. Background Art

[0002] A hyperbolic cooling tower, also known as a natural draft cooling tower, is a large thin-shell structure, usually used in thermal power plants and nuclear power plants with a lack of water sources. Its function is to cool the hot water discharged from the cooler in the hyperbolic cooling tower and then recycle it.

[0003] During the operation of a hyperbolic cooling tower, it usually faces the problem of side wind (i.e., natural wind enters from one side at the bottom of the tower body). Especially when the wind force level is relatively large (not less than level 3), affected by the inclined struts and heat exchange structures, a negative pressure area will also be formed on the leeward side, seriously affecting the uniformity of the circumferential air intake of the cooling tower, and at the same time increasing the air intake resistance and reducing the ventilation volume.

[0004] In recent years, in response to the side wind problem existing in hyperbolic cooling towers, Shandong University has developed a rain zone dry-wet hybrid cooling system for the internal and external coordination of natural draft wet cooling towers, including a natural draft wet cooling tower. There are several shunt plates in the rain zone of the natural draft wet cooling tower. The shunt plates are plate-like structures. One end of the shunt plate is connected to the tower wall of the natural draft wet cooling tower, and the other end of the shunt plate points to the adjacent shunt plate. Both sides of each shunt plate are inclined. One side of the shunt plate close to the cooling tower wall is lower than the other side of the shunt plate. All shunt plates are rotationally symmetric about the center of the radial section of the ultra-large wet cooling tower. The part of the rain zone covered by one shunt plate forms a dry zone. The air inlet at the bottom of the natural draft wet cooling tower is divided into several dry zone inlets and several rain zone inlets by several dry zones. Vertical wind guiding plates are arranged on both sides of the ground of each dry zone inlet, and the wind guiding plates are all arranged outside the tower wall. However, adopting this scheme can only reduce the ventilation resistance in the rain zone and enhance the uniformity of the gas-water field in the tower, and cannot ensure the uniformity of the gas field in the tower when the wind force level is relatively large, and does not have the advantage of energy saving.

[0005] More critically, existing hyperbolic cooling towers also have a serious problem of high energy consumption, especially when the wind force level is relatively large, because in this case, the natural wind almost crosses the bottom of the tower, plus the negative pressure area formed on the leeward side, resulting in the difficulty for the natural wind to flow upward from the bottom of the tower. Even when the fans in the tower operate at full load, the effect is minimal. Summary of the Invention

[0006] The purpose of the present invention is to provide a hyperbolic cooling tower, which can at least solve the problems of serious energy consumption and poor uniformity of the gas field in the tower existing in existing hyperbolic cooling towers when the wind force level is relatively large.

[0007] To achieve the foregoing purpose, the present invention adopts the following technical solutions.

[0008] A hyperbolic cooling tower includes a tower body, and a heat exchange structure is arranged inside the tower body. Hot medium water passes through the inner cavity of the heat exchange tubes of the heat exchange structure, and cooling air passes around the heat exchange tubes of the heat exchange structure. A circumferential air inlet is arranged around the bottom of the tower body. It is characterized in that: a plurality of groups of louvers are arranged at the circumferential air inlet, and the actuating mechanism of each group of louvers is connected to a controller, and the controller is also connected to a wind speed and wind direction sensor. The wind speed and wind direction sensor is used to obtain the wind speed and wind direction of the natural wind outside the circumferential air inlet. When the processor of the controller executes its program, the following steps are implemented:

[0009] S1. Obtain the real-time wind speed V and wind direction of the natural wind, and match the louvers on the windward side according to the obtained wind direction;

[0010] S2. Compare the obtained real-time wind speed V with a preset wind speed threshold V0, and control the opening and closing states of the louvers according to the comparison result: if the real-time wind speed V≥V0, control the louvers on the windward side to open, and all or part of the remaining louvers to close; if the real-time wind speed V<V0, open all the louvers.

[0011] As a preferred solution of the present invention, two groups of louvers are symmetrically arranged, and the wind direction is divided into the windward direction and the leeward direction; or, four groups of louvers are evenly arranged, and the wind direction is divided into the east wind direction, the west wind direction, the south wind direction, the north wind direction, the southeast wind direction, the northeast wind direction, the southwest wind direction, and the northwest wind direction; or, eight groups of louvers are evenly arranged, and the wind direction is divided into the east wind direction, the west wind direction, the south wind direction, the north wind direction, the southeast wind direction, the northeast wind direction, the southwest wind direction, and the northwest wind direction.

[0012] Furthermore, the controller is connected to a weather forecast system. When the processor of the controller executes its program, the following steps / functions are also implemented:

[0013] S3. Obtain the forecast wind direction and forecast wind speed V1 of each time period of the day in the weather forecast system in real time, compare the obtained forecast wind speed V1 with the preset wind speed threshold V0, and pre-control the opening and closing states of the louvers according to the comparison result: if the forecast wind speed V1≥V0, pre-control the louvers on the windward side to open at the starting time period corresponding to the forecast wind speed V1 (for example, when the forecast is 6-level west wind from 14:10 to 14:20 in the afternoon of the day, then 14:09 to 14:10 is the starting time period corresponding to the forecast wind speed), and all or part of the remaining louvers to close; if the forecast wind speed V1<V0, pre-control all the louvers to open at the starting time period corresponding to the forecast wind speed V1; if the forecast wind speed V1 is inconsistent with the obtained real-time wind speed V, quickly switch the louver state and execute according to step S2.

[0014] To further reduce the energy consumption of a hyperbolic cooling tower under a relatively high wind force level, the heat exchange structure includes a horizontally arranged baffle. A plurality of heat exchangers are arranged in an array on the upper plane of the baffle, and each heat exchanger is installed at the through hole of the baffle. A natural wind accommodation cavity with a lateral opening and an upper opening is jointly formed by the baffle, the heat exchangers, the tower body, and the louvers. The natural wind entering the natural wind accommodation cavity flows from the through hole to the periphery of the heat exchange tubes of the heat exchangers.

[0015] As a preferred solution, the baffle is circular. Based on the center of the baffle, all the heat exchangers form a plurality of annular structures with different diameters on the baffle.

[0016] To further improve the cooling efficiency, each heat exchanger includes a first heat exchange core and a second heat exchange core. The first heat exchange core and the second heat exchange core jointly form a double-slope roof structure, and the through hole of the baffle is located directly below the heat exchange core.

[0017] As a preferred solution, each heat exchange core has a process heat exchange tube and a return heat exchange tube. The upper ends of all the heat exchange tubes are connected to a transfer water chamber. The lower end of the process heat exchange tube is connected to the water inlet distribution cavity and the upper end is connected to the transfer water chamber. The lower end of the return heat exchange tube is connected to the water outlet cavity and the upper end is connected to the transfer water chamber. The heat medium water flows sequentially through the water inlet distribution cavity, the process heat exchange tube, the transfer water chamber, the return heat exchange tube, and the water outlet cavity.

[0018] To further improve the cooling efficiency, side baffles are arranged on the sides of each heat exchanger. A triangular space is jointly formed by the first heat exchange core, the second heat exchange core, and the two side baffles.

[0019] As a preferred solution, a fan is arranged above the heat exchange structure.

[0020] To further reduce the energy consumption of the hyperbolic cooling tower under a relatively high wind force level and further optimize the uniformity of the gas field, the baffle is higher than the top of the circumferential air inlet; the heat exchange tubes of the heat exchange structure adopt three-dimensional finned heat exchange tubes.

[0021] Beneficial effects: The scheme provided by the present invention can not only significantly reduce the energy consumption required during the cooling process in the hyperbolic cooling tower, but also ensure the uniformity of the air field in the tower, especially when the wind force level is large, it has better energy-saving advantages; during operation, when the wind force level is large, only the air inlet on the windward side is opened. At this time, the natural wind accommodating chamber in the tower is similar to a pocket structure. Natural wind will be poured into the natural wind accommodating chamber from the air inlet on the windward side under the action of wind force. At this time, the wind pressure in the natural wind accommodating chamber is higher than the wind pressure in other areas of the tower. This structure can cleverly convert the kinetic energy of natural wind into pressure energy, so that the natural wind can quickly flow through the heat exchange tube and exchange heat. At this time, the wind in the natural wind accommodating chamber can enter the heat exchange tube evenly and smoothly, thereby greatly improving the cooling efficiency. At the same time, it has a good energy-saving effect and can completely eliminate the fan; the hyperbolic cooling tower provided by the present invention not only has a simple structure and low wind resistance, but also is easy to install and maintain, has low maintenance difficulty, and has good safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of a hyperbolic cooling tower in Example 1;

[0023] Figure 2 It is a schematic diagram of the location of the heat exchange structure of the hyperbolic cooling tower in Example 1;

[0024] Figure 3 , Figure 4 A schematic diagram of a heat exchanger of the heat exchange structure of the hyperbolic cooling tower in Example 1;

[0025] Figure 5 It is a partial schematic diagram of the heat exchange structure of the hyperbolic cooling tower in Example 1;

[0026] Figure 6 It is a schematic diagram of the operation process of the hyperbolic cooling tower in Example 1 under the crosswind state;

[0027] Figure 7 It is a schematic diagram of the operation process of the hyperbolic cooling tower in Example 2 under the crosswind state;

[0028] Figure 8 This is a schematic diagram of the hyperbolic cooling tower in Example 1. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] Example 1

[0031] like Figures 1 to 5As shown in the figure, a hyperbolic cooling tower includes a tower body 1. A heat exchange structure is arranged inside the tower body 1. A fan 3 is arranged above the heat exchange structure. Hot medium water is supplied through the inner cavity of the heat exchange tubes of the heat exchange structure, and cooling air passes through the periphery of the heat exchange tubes of the heat exchange structure. A circumferential air inlet 2 is arranged around the bottom of the tower body 1. A plurality of groups of louvers are arranged at the circumferential air inlet 2. The actuating mechanism of each group of louvers is connected to a controller, and the controller is also connected to a wind speed and wind direction sensor, which is used to obtain the wind speed and wind direction of the natural wind outside the circumferential air inlet 2.

[0032] Among them, two groups of louvers are symmetrically arranged, and the wind direction is divided into the windward direction and the leeward direction.

[0033] Among them, the heat exchange structure includes a horizontally arranged baffle 10. A plurality of heat exchangers 11 are arranged in an array on the upper plane of the baffle 10. Each heat exchanger 11 is installed at the through hole of the baffle 10. A natural wind accommodation cavity with a lateral opening and an upper opening is jointly enclosed by the baffle 10, the heat exchangers 11, the tower body 1, and the louvers. The natural wind entering the natural wind accommodation cavity flows from the through hole to the periphery of the heat exchange tubes of the heat exchanger 11; the baffle 10 is circular. Based on the center of the baffle 10, all the heat exchangers 11 form a plurality of annular structures with different diameters on the baffle 10.

[0034] Among them, each heat exchanger 11 includes a first heat exchange core 13 and a second heat exchange core 14. The first heat exchange core 13 and the second heat exchange core 14 jointly form a double-slope roof structure. The through hole of the baffle 10 is located directly below the heat exchange core; each heat exchange core has a process heat exchange tube 15 and a return heat exchange tube 18. The upper ends of all the heat exchange tubes are connected to a transfer water chamber 16. The lower end of the process heat exchange tube 15 is connected to a water inlet distribution cavity 17 and the upper end is connected to the transfer water chamber 16. The lower end of the return heat exchange tube 18 is connected to a water outlet cavity 19 and the upper end is connected to the transfer water chamber 16. The hot medium water flows through the water inlet distribution cavity 17, the process heat exchange tube 15, the transfer water chamber 16, the return heat exchange tube 18, and the water outlet cavity 19 in sequence; a side baffle 20 is arranged on the side of each heat exchanger 11. A triangular space 21 is jointly enclosed by the first heat exchange core 13, the second heat exchange core 14, and two side baffles 20. Among them, the baffle 10 is higher than the top of the circumferential air inlet 2; the heat exchange tubes of the heat exchange structure adopt three-dimensional finned heat exchange tubes.

[0035] In this embodiment, when installing the heat exchange structure, two schemes can be adopted: First, install the baffle 10 first. The baffle 10 is provided with an operation hole. Lift each heat exchanger 11 from the operation hole to the upper surface of the baffle 10, and then install each heat exchanger 11 at the through hole one by one. Finally, install a maintenance cover plate at the operation hole; Second, install the baffle 10 first, and then lift a heat exchanger 11 from each through hole and directly install it at the corresponding through hole. Since the heat exchanger 11 has a double-slope roof structure, it can be directly lifted from the through hole. When the bottom of the heat exchanger 11 is lifted to the through hole, it can be directly installed.

[0036] In this embodiment, when the processor of the controller executes its program, the following steps are implemented:

[0037] S1. Obtain the real-time wind speed V and wind direction of the natural wind, and match the louvers on the windward side according to the obtained wind direction;

[0038] S2. Compare the obtained real-time wind speed V with a preset wind speed threshold V0, and control the opening and closing states of the louvers according to the comparison result: if the real-time wind speed V≥V0, control the louvers on the windward side to open and the other louvers to close; if the real-time wind speed V<V0, open all the louvers; in this embodiment, the wind speed threshold V0 = 3.3 m / s;

[0039] S3. Obtain the predicted wind direction and predicted wind speed V1 of each time period on the same day in the weather forecast system in real time, compare the obtained predicted wind speed V1 with the preset wind speed threshold V0, and pre-control the opening and closing states of the louvers according to the comparison result: if the predicted wind speed V1≥V0, pre-control the louvers on the windward side to open at the starting time period of the predicted wind speed V1 and the other louvers to close; if the predicted wind speed V1<V0, pre-control all the louvers to open at the starting time period of the predicted wind speed V1; if the predicted wind speed V1 is inconsistent with the obtained real-time wind speed V, quickly switch the state of the louvers and execute according to step S2.

[0040] Take Figure 6 as an example to further illustrate the operation of the hyperbolic cooling tower. The louvers are symmetrically divided into two groups. Figure 6 The louvers corresponding to the A1 area in Figure 1 are the first group, and the louvers corresponding to the A2 area are the second group. During the operation, if there is no wind or gentle wind in the morning of a certain day, the obtained real-time wind speed V of the natural wind <V0. In this stage, control all the louvers to open, so that the natural wind can enter the natural wind accommodation cavity more evenly from all directions. At the same time, turn on the fan 3. Figure 1 The arrows in indicate that the natural wind enters the natural wind accommodation cavity from the circumferential air inlet 2 and is discharged from the top of the tower body 1; if it is known through the weather forecast that there is a 6th-level east wind from 15:30 to 16:30 on a certain afternoon, pre-control the louvers on the windward side to open (that is, control the louvers in the A1 area to open) at the time period from 15:29 to 15:30 on that day, and control all the louvers in the A2 area (leeward side) to close; and when at 15:30, the 6th-level east wind has not appeared, indicating that the weather forecast is incorrect. At this time, quickly switch the state of the louvers and execute according to step S2 (if the real-time wind speed V of the natural wind obtained through the wind speed and wind direction sensor <V0, all the louvers can be controlled to open so that the natural wind can enter the natural wind accommodation cavity more evenly from all directions). Generally speaking, the control process uses the wind speed and wind direction of the weather forecast as the basis for pre-adjusting the state of the louvers, and makes timely adjustments based on the real-time wind speed of the natural wind obtained by the wind speed and wind direction sensor.

[0041] Example 2

[0042] A hyperbolic cooling tower, referring to Example 1, the main difference from Example 1 is that: four groups of louvers are evenly arranged, and the wind directions are divided into east wind direction, west wind direction, south wind direction, north wind direction, southeast wind direction, northeast wind direction, southwest wind direction, northwest wind direction. As Figure 7 shown, the louvers corresponding to area B1 are the first group, the louvers corresponding to area B2 are the second group, the louvers corresponding to area B3 are the third group, and the louvers corresponding to area B4 are the fourth group.

[0043] During operation, if the real-time wind speed V≥V0 and it is a northeast wind (i.e., inlet air 1), then control the louvers on the windward side (area B1) to open, and the rest of the louvers to close; if the real-time wind speed V<V0, then all louvers open. If the real-time wind speed V≥V0 and it is a southeast wind (i.e., inlet air 3), then control the louvers on the windward side (area B3) to open, and the rest of the louvers to close; if the real-time wind speed V<V0, then all louvers open; if the real-time wind speed V≥V0 and it is an east wind (i.e., inlet air 2), then control the louvers on the windward side (area B1 and area B2) to open, and the rest of the louvers to close.

[0044] Example 3

[0045] A hyperbolic cooling tower, referring to Example 1, the main difference from Example 1 is that: as Figure 8 shown, the fan 3 is omitted.

[0046] Example 4

[0047] A hyperbolic cooling tower, referring to Example 1, the main difference from Example 1 is that: the wind speed threshold V0 adopts a range value. In this case, V<V0 means that V is less than the minimum value in this range, and V1≥V0 means that V is greater than the maximum value in this range. During operation, compare the obtained real-time wind speed V with the preset wind speed threshold V0 (wind speed threshold V0 = 3.3 - 5.4 m / s), and control the opening and closing state of the louvers according to the comparison result: if the real-time wind speed V≥V0, then control the louvers on the windward side to open, and all the rest of the louvers to close; if the real-time wind speed V<V0, then all louvers open.

[0048] Example 5

[0049] A hyperbolic cooling tower, with reference to Embodiment 1, the main difference from Embodiment 1 is that: the wind speed threshold V0 adopts a range value. In this case, V < V0 means that V is less than the minimum value in this range, and V1 ≥ V0 means that V is greater than the maximum value in this range. During operation, the obtained real-time wind speed V is compared with the preset wind speed threshold V0 (wind speed threshold V0 = 3.3 - 20 m / s), and the opening and closing states of the louvers are controlled according to the comparison results: If the real-time wind speed V ≥ 20 m / s, then control the louvers on the windward side to open, and the other louvers are partially opened; if the real-time wind speed V < 3.3 m / s, then all louvers are opened; if the real-time wind speed 20 m / s ≥ V ≥ 3.3 m / s, then control the louvers on the windward side to open, and the other louvers are all opened.

[0050] Adopting the solution in the embodiment cannot significantly reduce the energy consumption required during the cooling process in the hyperbolic cooling tower, and can ensure the uniformity of the gas field inside the tower. Especially in the case of a large wind force level, it has better energy-saving advantages; during operation, when the wind force level is large, only the air inlet on the windward side is opened. At this time, the natural wind accommodation cavity inside the tower is similar to a pocket structure, and the natural wind will be poured into the natural wind accommodation cavity from the air inlet on the windward side under the action of the wind force. At this time, the wind pressure in the natural wind accommodation cavity is higher than the wind pressure in other areas of the tower. This structure can cleverly convert the kinetic energy of the natural wind into potential energy, so that the natural wind can quickly flow through the heat exchange tubes and exchange heat. At this time, the wind in the natural wind accommodation cavity can enter evenly and smoothly around the heat exchange tubes (the direction of the wind at this time is as Figure 3 shown by the arrow in the figure), thereby greatly improving the cooling efficiency, and at the same time having a good energy-saving effect, and can completely eliminate the fan; the hyperbolic cooling tower provided by the present invention not only has a simple structure, small wind resistance, but also is convenient for installation and maintenance, has a small maintenance difficulty, and good safety.

Claims

1. A hyperbolic cooling tower, comprising a tower body (1), wherein a heat exchange structure is arranged inside the tower body (1), hot medium water is supplied through the inner cavity of the heat exchange tubes of the heat exchange structure, cooling air passes through the periphery of the heat exchange tubes of the heat exchange structure, and a circumferential air inlet (2) is arranged around the bottom of the tower body (1), and is characterized in that: A plurality of groups of louvers are provided at the circumferential air inlet (2). The actuating mechanism of each group of louvers is connected to a controller, and the controller is also connected to a wind speed and direction sensor. The wind speed and direction sensor is used to obtain the wind speed and direction of the natural wind outside the circumferential air inlet (2). When the processor of the controller executes its program, the following steps are implemented: S1. Obtain the real-time wind speed V and direction of the natural wind, and match the louvers on the windward side according to the obtained direction; S2. Compare the obtained real-time wind speed V with a preset wind speed threshold V0, and control the opening and closing state of the louvers according to the comparison result: if the real-time wind speed V≥V0, control the louvers on the windward side to open, and all or part of the remaining louvers to close; if the real-time wind speed V<V0, control all the louvers to open; The controller is connected to a weather forecasting system. When the processor of the controller executes its program, the following step / function is also implemented: S3. Obtain the forecast wind direction and forecast wind speed V1 of each time period of the day in the weather forecasting system in real time, compare the obtained forecast wind speed V1 with the preset wind speed threshold V0, and pre-control the opening and closing state of the louvers according to the comparison result: if the forecast wind speed V1≥V0, pre-control the louvers on the windward side to open at the starting time period of the forecast wind speed V1, and all or part of the remaining louvers to close; if the forecast wind speed V1<V0, pre-control all the louvers to open at the starting time period of the forecast wind speed V1; if the forecast wind speed V1 is inconsistent with the obtained real-time wind speed V, quickly switch the louver state and execute according to step S2; The heat exchange structure includes a horizontally arranged baffle (10). A plurality of heat exchangers (11) are arranged in an array on the upper plane of the baffle (10). Each heat exchanger (11) is installed at the through hole of the baffle (10). A natural wind accommodating cavity with a side opening and an upper opening is formed by the baffle (10), the heat exchanger (11), the tower body (1), and the louvers. The natural wind entering the natural wind accommodating cavity flows from the through hole to the periphery of the heat exchange tubes of the heat exchanger (11); The baffle (10) is circular. Based on the center of the baffle (10), all the heat exchangers (11) form a plurality of annular structures with different diameters on the baffle (10); Each heat exchanger (11) includes a first heat exchange core (13) and a second heat exchange core (14). The first heat exchange core (13) and the second heat exchange core (14) together form a double-slope roof structure. The through hole of the baffle (10) is located directly below the heat exchange core; A side baffle (20) is provided on the side of each heat exchanger (11). A triangular space (21) is formed by the first heat exchange core (13), the second heat exchange core (14), and the two side baffles (20) together.

2. The hyperbolic cooling tower according to claim 1, wherein: Two groups of louvers are symmetrically arranged, and the wind direction is divided into the windward direction and the leeward direction; or, four groups of louvers are evenly arranged, and the wind direction is divided into the east wind direction, the west wind direction, the south wind direction, the north wind direction, the southeast wind direction, the northeast wind direction, the southwest wind direction, and the northwest wind direction; or, eight groups of louvers are evenly arranged, and the wind direction is divided into the east wind direction, the west wind direction, the south wind direction, the north wind direction, the southeast wind direction, the northeast wind direction, the southwest wind direction, and the northwest wind direction.

3. The hyperbolic cooling tower according to claim 1, characterized in that: Each heat exchange core has a process heat exchange tube (15) and a return heat exchange tube (18). The upper ends of all heat exchange tubes are connected to a transfer water chamber (16). The lower end of the process heat exchange tube (15) is connected to a water inlet distribution chamber (17), and the upper end is connected to the transfer water chamber (16). The lower end of the return heat exchange tube (18) is connected to a water outlet chamber (19), and the upper end is connected to the transfer water chamber (16). The heating medium water sequentially flows through the water inlet distribution chamber (17), the process heat exchange tube (15), the transfer water chamber (16), the return heat exchange tube (18), and the water outlet chamber (19).

4. The hyperbolic cooling tower according to claim 1, wherein: A fan (3) is provided above the heat exchange structure.

5. The hyperbolic cooling tower according to claim 1, wherein: The baffle (10) is higher than the top of the circumferential air inlet (2); the heat exchange tubes of the heat exchange structure adopt three-dimensional finned heat exchange tubes.

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