Temperature deviation control system for upper layer and lower layer of cooling triangle of direct air cooling system

Abstract

The utility model discloses an upper and lower layer temperature deviation control system for a cooling triangle of a direct air cooling system, and relates to the technical field of thermal power generation. According to the technical key points, the air cooling tower cooling device comprises a cooling triangular unit arranged on the peripheral side of the bottom of an air cooling tower, the cooling triangular unit is formed by combining two plate type heat exchange faces, and a plurality of louver blades are evenly arranged on the opening side of the cooling triangular unit in the vertical direction; the rotating shafts at the two ends of the louver blades are movably connected with the opening sides of the cooling triangular units respectively. The rotating shafts at the same ends of the louver blades at the upper half part of the opening side of the cooling triangular unit are connected with a first driving unit; and the rotating shafts at the same ends of the rest of the louver blades are connected with a second driving unit. The first driving unit and the second driving unit can be used for controlling the louver blades in different areas above and below the opening side of the cooling triangular unit in a zoning manner.

Description

Technical Field

[0001] The present application relates to the field of thermal power generation technology, and in particular to a temperature deviation control system for the upper and lower layers of a cooling triangle of a direct air cooling system. Background Art

[0002] At present, there are two types of air cooling systems in thermal power plants at home and abroad: one is the indirect air cooling system, and the other is the direct air cooling system. The indirect air cooling system is further divided into a hybrid air cooling system and a surface air cooling system.

[0003] The "air cooling" technology of traditional power plants appeared in the 1930s. The early air cooling system adopted a hybrid indirect air cooling system (IMC for short). By the late 1970s, the number of ISC systems (surface condenser indirect air cooling system) and ACC systems (mechanical ventilation direct air cooling system) put into operation began to increase. From the late 1980s to the mid-1990s, several indirect air cooling power plants with 200MW units were put into operation with the introduction of technology. Entering the 21st century, my country's power construction has developed rapidly. The northern region is rich in coal and lacks water. In order to achieve sustainable development of power construction, a large number of air-cooled power plants have been built since 2000. Since the power plants using the ACC system have low investment and short construction period, which meets the needs at that time, almost all the early air-cooled power plants adopted the ACC system. After a round of large-scale power construction and development, the construction speed slowed down, and various power generation companies paid more attention to various indicators of power plants. The indirect cooling system began to be valued. Since the operating back pressure of the ISC system is usually lower than that of direct air cooling, in order to pursue more power generation, the indirect cooling system began to be widely adopted.

[0004] The advantages of the mechanical ventilation direct air cooling system are high cooling efficiency, direct cooling of the turbine exhaust steam by air, and the reduction of intermediate links; the disadvantages are high power consumption and noise of the fan group, great influence of ambient wind, difficult solution of hot air reflux, and large fluctuation of unit back pressure. The advantages of the natural ventilation indirect air cooling system are large height difference between the air inlet and outlet of the air cooling tower, basically no hot air reflux, and less influence of strong winds in nature; the disadvantages are two heat exchanges, first cooling the circulating water by air, and then cooling the turbine exhaust steam by circulating cooling water, low cooling efficiency, and power consumption of the circulating water pump.

[0005] The natural ventilation direct air cooling system (NDC system for short) combines the advantages of both the ACC system and the ISC system. The general process is: the exhaust steam of the steam turbine is sent to the cooling triangle through the exhaust pipe, and the cooling triangle is arranged around the natural ventilation air cooling tower. The sufficient tower height and the ingenious architectural structure will form a huge suction force around the cooling tower. The suction force drives the cold air to continuously pass over the surface of the condenser, thereby achieving the purpose of directly cooling the exhaust steam. The natural ventilation direct air cooling system combines the characteristics of the mechanical ventilation direct air cooling system and the indirect air cooling system. The system does not require the installation of a mechanical ventilation fan group or a circulating water pump. There is basically no factory electricity and no noise. It makes up for the shortcomings of the ACC and ISC air cooling systems in carbon emission reduction, energy saving and consumption reduction, noise prevention and control, and the influence of environmental meteorological conditions, and can give full play to the potential of the air cooling system.

[0006] In the NDC system, a circle of cooling triangles is arranged around the bottom of the cooling tower. Water vapor to be cooled flows in the cooling triangle. The wind drawn from the cooling tower will pass over the surface of the cooling triangle to cool the internal exhaust steam. However, as the ambient temperature changes, it is necessary to control the wind force blowing onto the surface of the heat dissipating fins in the cooling triangle. Therefore, a shutter with adjustable opening size is provided on the front side of the cooling triangle to control the air intake as needed. However, the existing cooling triangle air intake control system uses an upper and lower integrated shutter actuator. In actual operation, there is a difference in the actual temperature of the upper half of the cooling triangle and its lower half, so their requirements for air volume are not consistent. If the shutters of the entire cooling triangle are controlled by a unified actuator, the air intake of the upper half of the cooling triangle is the same as that of the lower half, which will lead to a large difference in the temperature of the condensed water in the upper and lower parts of the cooling triangle, especially in winter, which is prone to the risk of freezing and cracking. Utility Model Content

[0007] The present application provides a temperature deviation control system for the upper and lower layers of a cooling triangle of a direct air cooling system, which can effectively solve the problem existing in the prior art when the shutters of the entire cooling triangle are controlled by a unified actuator.

[0008] The above-mentioned purpose of the present application is achieved through the following technical solutions:

[0009] A temperature deviation control system for the upper and lower layers of a cooling triangle of a direct air cooling system, comprising a cooling triangle unit arranged on the bottom circumference of an air cooling tower, the cooling triangle unit being composed of two plate-type heat exchange surfaces, and a plurality of louver blades being evenly arranged along the vertical direction on the opening side of the cooling triangle unit; a rotating shaft is fixedly arranged at the middle position of both ends of the louver blades, and the rotating shafts at both ends of the louver blades are respectively movably connected to the ends of the two plate-type heat exchange surfaces on the opening side of the cooling triangle unit;

[0010] The rotating shafts at the same end of the louver blades in the upper half of the opening side of the cooling triangle unit are connected to the first driving unit, and the first driving unit can drive the louver blades in this part to rotate synchronously; the rotating shafts at the same end of the louver blades in the remaining part are connected to the second driving unit, and the second driving unit can drive the louver blades in this part to rotate synchronously.

[0011] Furthermore, two mounting plates are symmetrically arranged on the opening side of the cooling triangle unit, and the same side of the two mounting plates is respectively fixedly connected to the ends of the two plate heat exchange surfaces on the opening side of the cooling triangle unit;

[0012] The rotating shafts at both ends of the shutter blades are rotatably connected to the two mounting plates respectively; and the mounting plates are parallel to the planes where the ends of the shutter blades on the adjacent sides are located, and the width of the mounting plates is not less than the width of the shutter blades.

[0013] Further, the first driving unit comprises a driving main rod, and a plurality of driving support rods are evenly hinged along the length direction of the driving main rod close to the cooling triangle unit; the number of the driving support rods is equal to the number of the louver blades to be driven by the opening side of the cooling triangle unit, and the plurality of driving support rods are fixedly connected to the rotating shafts at the ends of the louver blades at corresponding positions;

[0014] The middle position of the driving main rod is rotatably connected to the output end of the electric cylinder, and the other end of the electric cylinder is hinged on a positioning plate, and the positioning plate is fixedly installed on the top of the cooling triangle unit.

[0015] Furthermore, the second driving unit has the same structure as the first driving unit.

[0016] Furthermore, the upper and lower ends of the shutter blades are respectively stepped grooves, and the stepped grooves at the upper and lower ends of the shutter blades are symmetrical about the axis of the rotating shaft on the shutter blades.

[0017] Furthermore, at least two temperature sensors are arranged along the vertical direction on the inner side of the plate heat exchange surface in the cooling triangle unit.

[0018] Furthermore, the temperature sensor is a non-contact temperature sensor.

[0019] Furthermore, the electric cylinder, the driving main rod and the corresponding plurality of driving support rods are all located in a space enclosed by the mounting plate on the same side and the end of the plate heat exchange surface on the same side in the cooling triangle unit.

[0020] In summary, the present application includes at least one of the following beneficial technical effects:

[0021] In the present application, a part of the louver blades on the opening side of the cooling triangle unit are controlled in their opening and closing angles by a first drive unit, and the other part of the louver blades are controlled in their opening and closing angles by a second drive unit. The louvers in the upper and lower parts of the cooling triangle are innovatively controlled to independently partition the louvers, thereby enabling the opening of the louver blades in different areas to be adjusted in a targeted manner as needed, thereby solving the problem of large differences in condensate water temperature in the upper and lower parts of the cooling triangle and different ventilation volume requirements, and further improving the flexibility of unit operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 It is a state diagram of the cooling triangle unit of the present application when used together with an air cooling tower;

[0024] Figure 2 is a schematic diagram of the overall structure of the present application when viewed from the second drive unit side;

[0025] Figure 3 is a schematic diagram of the overall structure of the present application when viewed from the first drive unit side;

[0026] Figure 4 yes Figure 3 A schematic diagram of the enlarged structure at A in the middle;

[0027] Figure 5 It is a side view of two louver blades in the middle area of ​​the opening side of the cooling triangle unit of the present application.

[0028] Figure numerals: 1. cooling triangle unit; 2. shutter blades; 3. rotating shaft; 4. first driving unit; 41. driving main rod; 42. driving support rod; 43. electric cylinder; 44. positioning plate; 5. second driving unit; 6. mounting plate; 7. stepped groove. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the present application.

[0030] like Figure 1 and Figure 2 As shown, a temperature deviation control system for the upper and lower layers of the cooling triangle of a direct air cooling system disclosed in the present application comprises a cooling triangle unit 1 arranged on the bottom peripheral side of an air cooling tower, the cooling triangle unit 1 is composed of two plate-type heat exchange surfaces, and a plurality of louver blades 2 are evenly arranged along the vertical direction on the opening side of the cooling triangle unit 1; a rotating shaft 3 is fixedly arranged at the middle position of both ends of the louver blade 2, and the rotating shafts 3 at both ends of the louver blade 2 are respectively movably connected to the ends of the two plate-type heat exchange surfaces on the opening side of the cooling triangle unit 1;

[0031] The rotating shaft 3 at the same end of the louver blades 2 in the upper half of the opening side of the cooling triangle unit 1 is connected to the first driving unit 4, and the first driving unit 4 can drive this part of the louver blades 2 to rotate synchronously; the rotating shaft 3 at the same end of the louver blades 2 in the remaining part is connected to the second driving unit 5, and the second driving unit 5 can drive this part of the louver blades 2 to rotate synchronously.

[0032] In the above embodiment, there is a certain angle between the two plate heat exchange surfaces, which are V-shaped in the top view, and the open side of their angle is the open side of the cooling triangle unit 1, and the end of their angle is the closed end of the cooling triangle unit 1. When the air cooling tower is in use, multiple cooling triangle units 1 are surrounded by a ring around the bottom of the air cooling tower, wherein the closed ends of the cooling triangle units 1 are all facing the center of the air cooling tower, and the open side of the cooling triangle unit 1 is facing the outside of the air cooling tower. In the NDC system, the huge suction force generated by the air cooling tower (also called the cooling tower) will cause cold air to continuously enter from the open side of the cooling triangle unit 1 and pass upward over the surface of the two plate heat exchange surfaces in the cooling triangle unit 1, thereby taking away the heat of the exhaust steam in the cooling triangle unit 1 and condensing it. In actual production, since the ambient temperature will change with the change of seasonal climate, when the temperature of the external environment changes, it is often necessary to adaptively adjust the air volume blown to the cooling triangle unit 1. Therefore, a shutter is provided on the open side of the existing cooling triangle unit 1, and the air volume blown to the cooling triangle unit 1 can be controlled by adjusting the opening and closing angle of the shutter blades 2.

[0033] In the actual operation of the NDC system, it was observed that the temperature distribution inside the cooling triangle unit 1 was not consistent, especially the temperature inside the upper half of the upper cooling triangle unit 1 and its lower half was significantly different when in use. The current louver air intake control system on the front side of the cooling triangle unit 1 is controlled by a common louver actuator, generally a motor-driven connecting rod to synchronize the opening and closing of all louver blades 2 on the front side of the cooling triangle unit 1, so that the air intake volume of the upper and lower parts of the cooling triangle unit 1 is the same, but the temperature of the lower part of the cooling triangle unit 1 is actually inconsistent, which will lead to a large difference in the condensate temperature between the upper and lower parts of the cooling triangle, especially in winter, which can easily cause the plate heat exchange surface in the cooling triangle unit 1 to partially freeze and crack.

[0034] The present application divides the multiple louver blades 2 on the opening side of the cooling triangle unit 1 into two parts, one part of which corresponds to the upper half of the cooling triangle unit 1, and the other part corresponds to the lower half of the cooling triangle unit 1. The louver blades 2 corresponding to the upper half of the triangle unit are all connected to the first drive unit 4, and the louver blades 2 corresponding to the lower half of the triangle unit correspond to the second drive unit 5 (in actual production design, the number of louver blades 2 driven by the first drive unit 4 or the second drive unit 5 can be adjusted according to actual conditions). In this way, when the cooling tower is working, the multiple louver blades 2 on the front side of the cooling triangle unit 1 can be zoned controlled by the first drive unit 4 and the second drive unit 5, so that the air volume entering the upper and lower parts of the cooling triangle unit 1 is respectively suitable for the temperature of their respective internal materials, effectively solving the problem of inconsistent air volume requirements of the upper and lower parts of the cooling triangle unit 1, further improving the flexibility of the unit operation, and controlling the condensate subcooling degree to be no more than 6 degrees during the operation process, so that the back pressure of the unit can also be effectively controlled.

[0035] Furthermore, if Figure 2 and Figure 3 As shown, two mounting plates 6 are symmetrically arranged on the opening side of the cooling triangle unit 1, and the same side of the two mounting plates 6 is fixedly connected to the ends of the two plate heat exchange surfaces on the opening side of the cooling triangle unit 1 respectively;

[0036] The rotating shafts 3 at both ends of the shutter blades 2 are rotatably connected to two mounting plates 6 respectively; and the mounting plates 6 are parallel to the plane where the adjacent shutter ends are located, and the width of the mounting plates 6 is not less than the width of the shutter blades 2.

[0037] In the above embodiments, since the overall top view of the cooling triangle unit 1 is similar to a V-shape, if multiple louver blades 2 are directly installed on two plate heat exchange surfaces, then when the louver blades 2 rotate around the rotating shaft 3 at the end, the louver blades may interfere with the inner wall of the plate heat exchange surface. Therefore, the present application adds two mounting plates 6 on the opening side of the cooling triangle unit 1. The two mounting plates 6 are not only parallel to the plane where the ends of the louver blades 2 in the length direction are located, but also the width of the mounting plates 6 is greater than the width of the louver. In this way, when the louver blades 2 rotate around the axis of the rotating shaft 3 at their own ends, they will not touch the cooling triangle unit 1, and then rotate freely under the drive of the first drive unit 4 or the second drive unit 5.

[0038] Furthermore, if Figure 3 and Figure 4As shown, the first driving unit 4 includes a driving main rod 41, and a plurality of driving support rods 42 are evenly hinged along the length direction of the driving main rod 41 close to the cooling triangle unit 1. The number of the driving support rods 42 is equal to the number of the louver blades 2 to be driven on the opening side of the cooling triangle unit 1, and the plurality of driving support rods 42 are fixedly connected to the rotating shafts 3 at the ends of the louver blades 2 at corresponding positions.

[0039] The middle position of the driving main rod 41 is rotatably connected to the output end of the electric cylinder 43 , and the other end of the electric cylinder 43 is hinged on the positioning plate 44 , and the positioning plate 44 is fixedly installed on the top of the cooling triangle unit 1 .

[0040] In the above embodiment, the electric cylinder 43 can be electrically connected to the control system of the power plant, so that the technician can remotely operate the electric cylinder 43 to perform the operation. Figure 3 and Figure 4 Take the electric cylinder 43 in the figure as an example to explain that when it is necessary to open the multiple louver blades 2 on the upper half of the opening side of the cooling triangle unit 1, the electric cylinder 43 is started to shrink its output end into the cylinder body, thereby moving the driving main rod 41 upward together. Since the driving main rod 41 is connected to the multiple louver blades 2 on the upper half of the opening side of the cooling triangle unit 1 through multiple driving support rods 42, the driving main rod 41 drives the multiple louver blades 2 on the upper half of the opening side of the cooling triangle unit 1 to open synchronously through the multiple driving support rods 42 at the time of upward movement, and the opening angles are consistent. Compared with the prior art that drives multiple louver blades 2 through motors and connecting rods, the electric cylinder 43 works more smoothly, is simple to operate, and has high reliability. Moreover, it has the characteristics of high precision and good positioning accuracy in adjusting the opening and closing angles of the louver blades 2.

[0041] Furthermore, if Figure 2 and Figure 3 As shown, the second drive unit 5 has the same structure as the first drive unit 4 .

[0042] In the above embodiments, the second drive unit 5 of the present application has the same structure and working principle as the first drive unit 4, which is convenient for subsequent maintenance and repair, and the operation and learning are faster. If there is a difference between the number of shutter blades 2 to be driven by the second drive unit 5 and the number of shutter blades 2 to be driven by the first drive unit 4 in actual use, the length of their driving main rod 41 and the number of driving support rods 42 can be adaptively adjusted.

[0043] Furthermore, if Figure 5 As shown, the upper and lower ends of the shutter blade 2 are respectively stepped grooves 7, and the stepped grooves 7 at the upper and lower ends of the shutter blade 2 are symmetrical about the axis center of the rotating shaft 3 on the shutter blade 2.

[0044] In the above embodiments, when the weather is cold, all the louver blades 2 are usually closed to prevent the cooling triangle unit 1 from being frozen and cracked. However, in the prior art, the louver blades 2 are mostly planes, so even if all the louver blades 2 are closed, there is still a certain gap at their joints, and the cold wind in the environment can easily blow from the gap to the cooling triangle unit 1, so that the local condensed water in the cooling triangle unit 1 is affected. In the present application, the upper and lower ends of the louver blades 2 are designed to be stepped grooves 7, and the stepped grooves 7 at the upper and lower ends are symmetrical about the axis of the rotating shaft 3 at the end of the louver blades 2. Therefore, when the louver blades 2 are all closed, the stepped grooves 7 of the two adjacent louver blades 2 can complement each other, forming a curved gap at their joints, which can effectively prevent the cold air in the environment from blowing from their joints to the cooling triangle unit 1, thereby improving the protection effect of the cooling triangle unit 1 in cold weather. In actual production, there are no other shutter blades 2 on the upper side of the top shutter blade 2, so the upper side of the top shutter blade 2 can be set to a plane, and similarly, the lower side of the bottom shutter blade 2 can also be set to a plane, so that the multiple shutter blades 2 have a better overall appearance after being closed.

[0045] Furthermore, at least two temperature sensors are arranged on the inner side of the plate heat exchange surface in the cooling triangle unit 1 along the vertical direction.

[0046] In the above embodiments, taking two temperature sensors as an example, one of the temperature sensors is arranged on the upper side of the inner wall of the plate heat exchange surface, so as to facilitate monitoring the temperature of the upper half of the cooling triangle unit 1; the other temperature sensor is arranged on the lower side of the inner wall of the plate heat exchange surface, so as to facilitate monitoring the temperature of the lower half of the cooling triangle unit 1, and they are all electrically connected to the relevant control system of the power plant, so that the technicians can timely and accurately adjust the opening of the louver blades 2 corresponding to different areas of the cooling triangle unit 1 according to the temperature values ​​monitored by the two temperature sensors, so as to optimize the heat dissipation efficiency and operating cost of the radiator of the cooling triangle unit 1.

[0047] Furthermore, if Figure 4 As shown, the temperature sensor is a non-contact temperature sensor.

[0048] In the above embodiments, compared with the traditional contact temperature sensor, the non-contact temperature sensor can measure the corresponding temperature without contacting the object to be measured, which can avoid the wear caused by the contact between the two and greatly reduce the maintenance cost. In addition, compared with the traditional contact temperature sensor, its response speed is faster, which can facilitate technicians to understand the temperature changes on site in a timely and rapid manner; the accuracy of the non-contact temperature sensor will also be higher. In actual use, multiple non-contact temperature sensors can be set on the inside of the cooling triangle unit 1 to measure the temperature distribution of the temperature field formed by the cooling triangle unit 1 when it is working, so that technicians can have a more detailed working condition of the connection equipment.

[0049] Furthermore, if Figure 2 and Figure 3 As shown, the electric cylinder 43, the driving main rod 41 and the corresponding plurality of driving support rods 42 are all located in a space enclosed by the mounting plate 6 on the same side and the end of the plate heat exchange surface on the same side in the cooling triangle unit 1.

[0050] In the above embodiments, the electric cylinder 43, the driving main rod 41 and the corresponding plurality of driving support rods 42 are arranged in the above manner, so that the overall layout of the equipment can be more reasonable and compact.

[0051] The implementation principle of this embodiment is: when the cooling triangle unit 1 is in operation, there is a temperature difference between the upper and lower parts thereof. When the air intake volume of their respective areas needs to be adaptively adjusted, the technician can refer to the detected temperature difference, first start the first driving unit 4 to open the multiple shutter blades 2 connected thereto to a certain angle, and then start the second driving unit 5 to open the multiple shutter blades 2 connected thereto to another angle. Since the opening angles of the shutter blades 2 in the areas corresponding to the upper and lower parts of the cooling triangle unit 1 are different, the air volumes blown toward them can be different, thereby reducing the temperature difference of condensed water between the two.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A temperature deviation control system for the upper and lower layers of a cooling triangle of a direct air cooling system, comprising a cooling triangle unit (1) arranged around the bottom of an air cooling tower, characterized in that: The cooling triangle unit (1) is composed of two plate-type heat exchange surfaces, and a plurality of louver blades (2) are evenly arranged along the vertical direction on the opening side of the cooling triangle unit (1); a rotating shaft (3) is fixedly arranged in the middle position of both ends of the louver blades (2), and the rotating shafts (3) at both ends of the louver blades (2) are respectively movably connected to the ends of the two plate-type heat exchange surfaces on the opening side of the cooling triangle unit (1); The rotating shafts (3) at the same end of the louver blades (2) in the upper half of the opening side of the cooling triangle unit (1) are all connected to a first drive unit (4), and the first drive unit (4) can drive the louver blades (2) in this part to rotate synchronously; the rotating shafts (3) at the same end of the louver blades (2) in the remaining part are connected to a second drive unit (5), and the second drive unit (5) can drive the louver blades (2) in this part to rotate synchronously.

2. The temperature deviation control system for the upper and lower layers of the cooling triangle of the direct air cooling system according to claim 1 is characterized by: Two mounting plates (6) are symmetrically arranged on the opening side of the cooling triangle unit (1), and the same side of the two mounting plates (6) is respectively fixedly connected to the ends of two plate-type heat exchange surfaces on the opening side of the cooling triangle unit (1); The rotating shafts (3) at both ends of the shutter blades (2) are rotatably connected to the two mounting plates (6) respectively; the mounting plates (6) are parallel to the planes where the ends of the shutter blades (2) on the adjacent sides are located, and the width of the mounting plates (6) is not less than the width of the shutter blades (2).

3. The temperature deviation control system for the upper and lower layers of the cooling triangle of the direct air cooling system according to claim 2 is characterized by: The first driving unit (4) comprises a driving main rod (41), and a plurality of driving support rods (42) are evenly hinged along the length direction of the driving main rod (41) on a side close to the cooling triangle unit (1); the number of the driving support rods (42) is equal to the number of the louver blades (2) to be driven on the opening side of the cooling triangle unit (1), and the plurality of driving support rods (42) are fixedly connected to the rotating shaft (3) at the end of the louver blade (2) at the corresponding position; The middle position of the driving main rod (41) is rotationally connected to the output end of the electric cylinder (43), and the other end of the electric cylinder (43) is hinged on a positioning plate (44), and the positioning plate (44) is fixedly installed on the top of the cooling triangle unit (1).

4. The temperature deviation control system for the upper and lower layers of the cooling triangle of the direct air cooling system according to claim 3 is characterized by: The second drive unit (5) has the same structure as the first drive unit (4).

5. The temperature deviation control system for the upper and lower layers of the cooling triangle of the direct air cooling system according to any one of claims 1 to 4, characterized in that: The upper and lower ends of the shutter blade (2) are respectively stepped grooves (7), and the stepped grooves (7) at the upper and lower ends of the shutter blade (2) are symmetrical about the axis of the rotating shaft (3) on the shutter blade (2).

6. The temperature deviation control system for the upper and lower layers of the cooling triangle of the direct air cooling system according to any one of claims 1 to 4, characterized in that: More than two temperature sensors are arranged along the vertical direction on the inner side of the plate-type heat exchange surface in the cooling triangle unit (1).

7. The temperature deviation control system for the upper and lower layers of the cooling triangle of the direct air cooling system according to claim 6 is characterized by: The temperature sensor is a non-contact temperature sensor.

8. The temperature deviation control system for the upper and lower layers of the cooling triangle of the direct air cooling system according to claim 3 or 4, characterized in that: The electric cylinder (43), the driving main rod (41) and the corresponding plurality of driving support rods (42) are all located in a space enclosed by the mounting plate (6) on the same side and the end of the plate heat exchange surface on the same side in the cooling triangle unit (1).

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