Low-wind-resistance cooling tower cooling triangular unit, cooling tower and cooling method

Abstract

The invention provides a low-wind-resistance cooling tower cooling triangular unit, a cooling tower and a cooling method, and relates to the technical field of heat exchange equipment and processes. An air inlet grille used for inputting cold air is arranged on the front end face of a cooling triangular unit of the low-wind-resistance cooling tower, and a first side end face and a second side end face are two air cooling heat exchangers connected in a V shape; cooling water is input into the air-cooling heat exchanger to be cooled after exchanging heat with cold air, and the cold air flows into the axis direction of the cooling tower after exchanging heat with the air-cooling heat exchanger; wherein a plurality of parallel flying wing type finned tubes are arranged in the air cooling heat exchanger, the flying wing type finned tubes are flat tubes, and flying wing type fins are arranged on two opposite wide surfaces of each flying wing type finned tube; the flying wing type finned tubes are arranged along the flowing direction of cold air; the upper sealing plate is arranged on the upper portion, and the lower sealing plate is arranged on the lower portion. The reversing times of the process that cooling air enters the cooling tower through the cooling triangle can be effectively reduced, wind resistance is reduced, and meanwhile the heat exchange efficiency of the cooling triangle unit is improved.

Description

Technical Field

[0001] The invention relates to the field of heat exchange equipment and process technology, and in particular to a low-wind resistance cooling tower cooling triangle unit, a cooling tower and a cooling method. Background Art

[0002] Taking thermal power plants as an example, various types of cooling towers are important equipment in the production process of thermal power plants. Their function is to exchange heat between the cooling water carrying heat and the air in the tower, so that the heat is transferred to the air and dissipated into the atmosphere, thereby ensuring the normal operation of the equipment. According to the different contact methods between water and air, cooling towers can be divided into wet cooling towers and dry cooling towers.

[0003] Traditional cooling towers mostly use direct spray wet cooling tower systems, which use water spray or atomization to enhance heat exchange. Since wet cooling towers lose 10-20% of water by evaporation while achieving heat dissipation, it causes resource consumption. In order to save water, dry cooling towers use hot water to flow in the heat dissipation pipes, and cool through contact heat transfer through the temperature difference of the air outside the pipes, thereby achieving closed-loop heat dissipation of hot water and avoiding water loss.

[0004] In order to arrange more heat exchangers in a limited space, the existing dry cooling tower (taking the natural ventilation tower as an example) arranges heat exchangers including multiple rows of heat exchange tubes in a triangular shape around the bottom of the dry cooling tower, with the air inlet on the outside and a heat exchanger on each side of the inside to form a cooling triangle unit; during operation, cold air enters from the air inlet of the cooling triangle unit, and after heat exchange in the heat exchanger, flows toward the axial direction of the tower. It must be deflected at least twice between the heat exchanger surface and the heat exchange tubes inside the heat exchanger before entering the cooling tower. Excessive flow resistance along the way will cause insufficient cooling air volume, resulting in a decrease in the cooling performance of the air cooling system.

[0005] Patent CN112284157A discloses a cooling triangle unit that can realize triangular space air side self-rectification. The cooling triangle unit realizes precise control and distribution of the local air intake at the outer end of the cooling column of the cooling triangle unit by vertically arranging the air side self-rectification device on both sides of the middle symmetry plane of the cooling triangle unit, and at the same time rectifying the air intake of the triangular space of the cooling triangle unit, thereby effectively eliminating the lateral vortex in the triangular unit space and balancing the air intake of the cooling columns on both sides of the cooling triangle unit. This technical solution improves the overall heat transfer effect of the cooling triangle unit and reduces the unbalanced temperature difference. The system improves the comprehensive performance of the cooling triangle unit, but it cannot effectively reduce the number of deflections of cold air entering the cooling tower.

[0006] Patent CN114754605A discloses a cooling triangle unit with a rotating plate type flow equalization and antifreeze integrated device, including a cooling triangle unit and a rotating plate type flow equalization and antifreeze integrated device, which can adjust the angle between the rotating plate and the cooling column according to the ambient wind speed and direction, thereby achieving the purpose of flow equalization and antifreeze; in summer, the rotation angle of the rotating plate can be adjusted to make it coincide with the vertical center symmetry plane of the cooling triangle unit, thereby playing a flow equalization role for the cooling triangle unit; in winter, when the ambient wind speed is large and the inlet angle is large, the rotation angle of the rotating plate can be adjusted to prevent the ambient wind from directly hitting the cooling column, thereby playing an antifreeze role for the cooling triangle unit; this technology does not pay attention to the wind resistance problem of cooling air when the cooling triangle unit is in operation.

[0007] Patent CN114719664A discloses a cooling triangle unit with a flow-equalizing louver with vertically rotatable louvers, including a cooling triangle unit and a flow-equalizing louver with vertically rotatable louvers, and the louvers can be adjusted according to the ambient wind speed and wind direction: when the ambient wind speed is low, the louvers are set to a closed state to achieve the effect of equalizing the flow on the cooling triangle air side; when the ambient wind speed is high and there is a certain deviation of the incoming air, the louvers are opened to a certain angle to reduce the ventilation resistance inside the cooling triangle unit, optimize the ambient wind distribution inside the cooling triangle unit, and improve the heat exchange performance of the cooling triangle unit; this technology reduces wind resistance by setting a guide structure in the cooling triangle unit, but the cooling air always needs to go through several changes of direction when flowing from the outside into the cooling tower, resulting in a large wind resistance. Summary of the invention

[0008] In view of the deficiencies in the prior art, the present invention proposes a low wind resistance cooling tower cooling triangle unit, a cooling tower and a cooling method, which are used to solve the problem of large wind resistance caused by deflection after cold air is input into the cooling tower when the cooling tower is running.

[0009] In order to achieve the above technical objectives, on the one hand, the present invention proposes a low-drag cooling tower cooling triangle unit, the front end face of the cooling triangle unit is provided with an air intake grille for inputting cold air, the first side end face and the second side end face are two air-cooling heat exchangers connected in a V-shape; cooling water is input into the air-cooling heat exchanger for heat exchange with the cold air and then cooled down, and the cold air flows into the axial direction of the cooling tower after heat exchange with the air-cooling heat exchanger; it also includes an upper sealing plate arranged at the top and a lower sealing plate arranged at the bottom; wherein, a plurality of parallel-arranged flying wing-type fin tubes are arranged in the air-cooling heat exchanger, and the flying wing-type fin tubes are flat tubes on which two opposite wide surfaces are provided with flying wing-type fins; the flying wing-type fin tubes are arranged downwind along the flow direction of the cold air.

[0010] In the above technical solution, in order to reduce wind resistance, the flat tube-shaped heat exchange tubes in the air-cooled heat exchanger are arranged along the wind direction of the air flow, so that the cold air can be directly exchanged with the heat exchange tubes after being input into the cooling triangle unit, and then can continue to flow toward the axial direction of the tower, avoiding the operating condition in which multiple rows of heat exchange tubes are arranged in the existing dry cooling tower, resulting in multiple deflections of cold air between the heat exchange tubes, so that more cold air passes through the heat exchanger per unit time, thereby enhancing the heat exchange between the air and the heat exchanger.

[0011] However, after the cold air circulation resistance decreases, the cold air flow rate is too fast, which easily leads to the condition that the local heat exchange effect is affected due to insufficient contact time between the cold air and the heat exchanger. Furthermore, in the above technical solution, a flat tube-shaped flying wing fin tube is used to replace the traditional round tube heat exchange tube. Its fluid pipeline and flying wing fin are an integrated structure. There is no contact thermal resistance between the flying wing fin and the inner channel during operation, thereby promoting effective heat exchange between the cold air and the air-cooled heat exchanger under low wind resistance conditions, thereby comprehensively improving the heat exchange efficiency of the cooling triangle unit.

[0012] The air-cooled heat exchanger described in the above technical solution forms a stable cooling triangle unit structure with the upper sealing plate and the lower sealing plate. The cooling triangle unit of the present invention can be widely used in large and medium-sized air cooler equipment in natural ventilation towers of power stations, auxiliary power towers and other application scenarios (such as oil refining, chemical plants, metal smelting, etc.), and has a wide range of application value.

[0013] On the other hand, the present invention provides a low wind resistance cooling tower, which comprises the low wind resistance cooling tower cooling triangle unit.

[0014] On the other hand, the present invention proposes a cooling method for a low-drag cooling tower, in which cooling water carrying waste heat from an upstream process is input into an air-cooled heat exchanger at the side end face of the cooling triangle unit of the cooling tower, and is in contact with the cold air input from the front end face of the cooling triangle unit for heat exchange; the cooled cooling water is output from the air-cooled heat exchanger and then returns to the upstream power generation process, and the cold air continues to flow toward the axial direction of the cooling tower after heat exchange and is finally output from the cooling tower; wherein, a plurality of parallel-arranged flying wing-type fin tubes are arranged in the air-cooled heat exchanger, and the flying wing-type fin tubes are flat tubes whose opposite wide faces are provided with flat tubes with flying wing-type fins; the flying wing-type fin tubes are arranged downwind along the flow direction of the cold air.

[0015] Furthermore, the included angle between the two side end faces of the cooling triangle unit is a vertex angle θ, and the included angle α between the flying wing fin tube and the side end face satisfies: α=1 / 2θ±5°.

[0016] Furthermore, α=1 / 2θ.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The air-cooled heat exchanger of the cooling triangle unit of the low-drag cooling tower of the present invention adopts flat-tube-shaped flying-wing fin tubes as heat exchange tubes, and the flying-wing fin tubes are arranged downwind along the flow direction of the cold air, which effectively reduces the wind resistance, so that the cold air input into the cooling triangle continues to flow toward the axial direction of the tower after heat exchange with the flying-wing fin tubes, avoiding the operating condition in which multiple rows of heat exchange tubes are arranged in the existing dry cooling tower, resulting in multiple deflections of the cold air between the heat exchange tubes, and improving the circulation efficiency of the cold air, thereby providing sufficient cooling capacity for cooling the circulating materials in the air-cooled heat exchanger, and at the same time improving the heat exchange efficiency of the cooling triangle unit.

[0019] The low wind resistance cooling tower of the present invention can reduce the number of reversals of cooling air in the process of entering the interior of the cooling tower through the cooling triangle, thereby reducing wind resistance and increasing the cooling air volume of the natural ventilation dry air cooling system, and the overall cooling tower has high operating heat exchange efficiency.

[0020] The cooling method of the low wind resistance cooling tower of the present invention has a convenient process flow, sufficient cold air supply, high heat exchange efficiency, low equipment processing and maintenance costs, wide applicability, and important application and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0022] Figure 1 A structural diagram showing a cooling triangle unit of a low wind resistance cooling tower of the present invention;

[0023] Figure 2 Show Figure 1 An exploded structural diagram of a low-drag cooling tower cooling triangle unit;

[0024] Figure 3 It is a schematic diagram of the operation of the cooling triangle unit of the low wind resistance cooling tower of the present invention;

[0025] Figure 4 The heat transfer coefficient variation curve of the air-cooled heat exchanger under different operating parameters in Example 1 is shown;

[0026] Figure 5 A structural diagram of an air-cooled heat exchanger in a cooling triangle unit of a low-drag cooling tower of the present invention;

[0027] Figure 6 A structural diagram showing a flying wing type fin tube in a cooling triangle unit of a low wind resistance cooling tower of the invention;

[0028] Figure 7 This is a cross-sectional schematic diagram of a cooling triangle unit of a low wind resistance cooling tower of the present invention. Please note that for the purpose of simplicity, Figure 1 to Figure 3 , Figure 5 , Figure 7 The flying fins on the flying fin tubes are not shown.

[0029] The above drawings include the following reference numerals:

[0030] 1-air-cooled heat exchanger, 11-flying wing fin tube, 12-flying wing fin, 13-upper tube plate, 14-lower tube plate, 15-upper tube cap, 16-lower tube cap, 17-side beam, 2-air intake grille, 31-upper sealing plate, 32-lower sealing plate. DETAILED DESCRIPTION

[0031] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below, and preferred embodiments of the present invention are given. However, it should be understood that these embodiments are only used for more detailed description and should not be understood as limiting the present invention in any form, i.e., not intended to limit the scope of protection of the present invention.

[0032] Unless otherwise defined, the technical terms used in the following examples have the same meanings as those generally understood by those skilled in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods, unless otherwise specified, are all conventional methods.

[0033] Example 1

[0034] A low wind resistance cooling tower cooling triangle unit, combined with Figure 1-2 The front end face of the cooling triangle unit is provided with an air intake grille 2 for inputting cold air, and the first side end face and the second side end face are two air-cooling heat exchangers 1 connected in a V shape; cooling water is input into the air-cooling heat exchanger 1 for heat exchange with cold air and then cooled down, and the cold air flows into the axial direction of the cooling tower after heat exchange with the air-cooling heat exchanger 1; it also includes an upper sealing plate 31 arranged at the upper part and a lower sealing plate 32 arranged at the lower part; wherein, a plurality of parallel-arranged flying wing fin tubes 11 are arranged in the air-cooling heat exchanger 1, and the flying wing fin tubes 11 are flat tubes, and two opposite wide surfaces thereof are provided with flying wing fins 12; the flying wing fin tubes 11 are arranged downwind along the flow direction of cold air.

[0035] It can be understood that the flat tube-shaped heat exchange tube is arranged downwind with the air flow direction, which will reduce the resistance encountered by the cold air after it is input into the cooling triangle unit, and reduce the obstacles encountered by the air during the flow, which usually means an increase in the air flow rate; further, a higher air circulation rate will lead to a reduction in the residence time of the cold air in the heat exchanger and insufficient contact time with the heat exchanger, thereby affecting the local heat exchange effect.

[0036] Based on a large number of test results, the present invention adopts the flying wing fin tube 11 as the heat exchange tube of the air-cooled heat exchanger 1, and innovatively arranges the flat tube-shaped flying wing fin tube 11 along the windward direction of the air flow, combined with Figure 3 It can be seen that during actual operation, the cooling air can be guided to be input from the air intake grille 2 to exchange heat with the flying wing fin tube 11, and then flow toward the axial direction of the cooling tower. This not only avoids the increase in flow resistance due to interference from obstacles such as other pipes and steps during the flow of cooling air toward the center of the tower, but also improves the heat exchange efficiency of the cooling triangle unit under low wind resistance conditions.

[0037] Specific tests include:

[0038] On the one hand, in this embodiment, the structure and heat transfer efficiency related parameters of the conventional aluminum tube-aluminum fin heat exchange tube and the aluminum flying wing fin tube 11 are tested. The test results are shown in Table 1.

[0039] Table 1

[0040] parameter Aluminum tube-aluminum fin heat exchange tube Flying wing fin tube 11 <![CDATA[Contact thermal resistance (m 2 ·K / W)]]> <![CDATA[7×10 -5 ~3×10 -4 ]]> 0 <![CDATA[Body density (kg / m 3 )]]> 60～85 30～35 <![CDATA[Fin area (m 2 / m)]]> 1.7811 3.67 <![CDATA[Wind-side heat transfer coefficient (W / (m 2 ·K))]]> <![CDATA[479U N 0.718 ]]> <![CDATA[≈1031U N 0.8 ]]> Hydraulic diameter (mm) 20 12.7

[0041] In traditional radiators, the connection between the tube body and the fins of the finned heat exchange tube is welded or fastened, such as a steel tube-aluminum fin heat exchange tube or an aluminum tube-aluminum fin heat exchange tube. The resulting thermal resistance is the primary factor affecting the heat dissipation performance. The air-cooled heat exchanger 1 of the cooling triangle unit of the present invention adopts a flying wing fin tube 11, and the flying wing fin 12 on the tube body is made by a scraping process, so the heat sink and the heat dissipation tube are integrated, realizing the heat dissipation of the body and no contact thermal resistance.

[0042] It can be confirmed from Table 1 that the heat dissipation performance of the traditional fin heat exchange tube is limited by the contact thermal resistance, while the flying wing fin tube 11 used in the present invention achieves zero contact thermal resistance, which greatly improves the heat transfer efficiency of the air-cooled heat exchanger 1. The fin area and wind-measured heat transfer coefficient of the flying wing fin tube 11 are significantly better than those of the traditional fin heat exchange tube, further confirming the excellent heat exchange performance of the flying wing fin tube 11; in addition, the flying wing fin tube 11 of the same material has a smaller body density than the traditional fin heat exchange tube, and thus has a higher thermal conductivity. The lightweight feature makes it easy to design and install, and can adapt to various complex space and structural requirements; in addition, the hydraulic diameter of the flying wing fin tube 11 is relatively small, which can increase the flow rate of the fluid in the tube body, making it easier to reach a turbulent state to further improve the heat exchange efficiency.

[0043] On the other hand, the heat exchange performance of the air-cooled heat exchanger 1 used in this embodiment was tested using a standard wind tunnel test bench. During the test, the heat exchange medium flowing in the heat exchange tube was water, and the flat tube-shaped flying wing fin tubes 11 were arranged downwind. Specifically, the flow channels between the flat tube-shaped flying wing fins 11 tended to be parallel to the air flow direction. Under this working condition, the air flow resistance was small, which correspondingly promoted the increase in the air flow rate.

[0044] Based on this, this embodiment tests the heat exchange and air-side and water-side flow resistance at different oncoming air flow rates at four water flow rates of 438L / min, 626L / min, 817L / min and 1001L / min, where the corresponding flow rates in the tube are 0.7, 1.0, 1.3 and 1.6 (m / s), respectively, thereby exploring the influence of oncoming mass wind speed on the heat transfer coefficient of the heat exchanger. The test results are as follows Figure 4 As shown, the windward surface refers to the surface area that the cold air first contacts when passing through the air-cooled heat exchanger 1.

[0045] Based on the test results, the least square method is used to fit the data and confirm that the correlation between the heat transfer coefficient of the air-cooled heat exchanger 1 including the flying wing fin tube 11 and the air mass flow rate on the windward surface and the water flow rate in the tube can be selected as formula (1):

[0046] K=38.7466v a 0.212 v w 0.088 Formula (1);

[0047] Where, 1.0≤v a ≤5.0,0.7≤v w ≤1.6; v a is the wind speed on the heat exchanger, m / s; v w is the water flow velocity in the tube, m / s; K is the heat transfer coefficient of the radiator, W / (m 2 ·℃).

[0048] Combination Figure 4 It can be seen that the heat transfer coefficient of the air-cooled heat exchanger 1 including the flying wing fin tube 11 increases with the increase of the air mass wind speed, and also increases with the increase of the water flow velocity in the tube. This reflects that in the cooling triangle unit of the low-resistance cooling tower of the present invention, by arranging the flat tube-shaped flying wing fin tube 11 along the air flow direction, although the flow resistance of cold air is increased and reduced and the wind speed is increased, the convective heat exchange between the air and the heat exchange surface is also enhanced, avoiding the working condition of uneven local heat exchange of the heat exchanger due to the increase in wind speed, and improving the heat transfer efficiency of the overall air-cooled heat exchanger 1.

[0049] Figure 5The structure diagram of an air-cooled heat exchanger 1 is shown. The air-cooled heat exchanger 1 includes a heat exchanger core, which includes an upper tube sheet 13, a lower tube sheet 14 and a plurality of wing-shaped fin tubes 11; the wing-shaped fin tubes 11 are flat tubes, and two opposite wide surfaces thereof are provided with wing-shaped fins 12; the plurality of wing-shaped fin tubes 11 are arranged in parallel between the upper tube sheet 13 and the lower tube sheet 14; and the upper tube cap 15 and the lower tube cap 16 connected to the upper and lower tube sheets are also included. The space formed by the tube sheet and the corresponding tube cap is used to collect and divert the heat exchange medium. The air-cooled heat exchanger 1 is also provided with side beams 17 on both sides of the heat exchange core.

[0050] Figure 6 An optional structural diagram of the flying wing fin tube 11 in the heat exchange core is shown; wherein the flying wing fin is a thin sheet of metal formed by scraping the surface of the flying wing fin tube 11, so the fluid pipeline and the flying wing fin 12 are generated as one body, and there is no contact thermal resistance between the flying wing fin and the inner channel, thereby maximizing the internal heat transfer capacity while also enhancing the overall structural strength of the flying wing fin tube 11, which is beneficial for the cooling triangle unit of the low wind resistance cooling tower of this embodiment to maintain a high heat exchange efficiency even under low wind resistance conditions.

[0051] Example 2

[0052] Based on the low wind resistance cooling tower cooling triangle unit shown in Example 1, this embodiment explores and optimizes the flying wing fin tubes 11 in the cooling triangle unit at multiple angles along the cold air flow direction to further reduce the resistance of the cold zone triangle unit to the cold air flow and improve the heat exchange efficiency. Specifically:

[0053] Optionally, the included angle between the first side end face and the second side end face is a vertex angle θ, and the included angle α between the flying wing fin tube 11 and the first side end face or the second side end face satisfies: α=1 / 2θ±5°. Figure 7 , adjacent flying wing fin tubes 11 form a heat exchange passage for the flow of cold air in the air-cooled heat exchanger 1. When α is within this angle range, the flow passage between the flying wing fin tubes 11 in the air-cooled heat exchanger 1 is nearly parallel or parallel to the flow passage of the air input from the air intake grille 2, thereby optimizing the cold air flow path from the air intake grille 2 to the axis of the cooling tower, reducing the formation of turbulence and eddy currents, greatly reducing wind resistance, and promoting heat exchange between the cold air and the flying wing fin tubes 11.

[0054] It should be noted that the angle α in the present invention refers to the angle between the flying wing fin tube 11 in the first side end face or the second side end face and the corresponding side end face. The angle in the present invention is the smaller of the complementary angles when two planes intersect.

[0055] Further optionally, the angle α between the flying wing fin tube 11 and the first side end face or the second side end face is 1 / 2θ, so that the flow channel between the flying wing fin tube 11 in the air-cooled heat exchanger 1 is parallel to the flow channel of the air input from the air intake grille 2, forming an unobstructed flow path from the air intake grille to the axis of the cooling tower, guiding the cold air to flow rapidly toward the center of the cooling tower.

[0056] Further optionally, the value range of the vertex angle θ satisfies 60°≤θ≤90°, and the air-cooled heat exchanger is arranged in a V-shape, and its angle θ (60°≤θ≤90°) forms a synergistic effect with the arrangement angle α of the flying wing fin tube (α=1 / 2θ±5°). Through angle matching, the fin tube tends to be parallel to the air flow direction, so that the cold air flows in a straight line toward the tower axis after entering from the air intake grille, avoiding multiple deflections in the traditional multi-row tube layout. This design not only reduces wind resistance, but also prolongs the effective contact time between the air and the fin tube by optimizing the flow path, thereby improving the overall heat exchange efficiency. Accordingly, the optional range of α is 25°≤α≤50°, and the appropriate α angle can be set as needed in actual working conditions.

[0057] Example 3

[0058] Based on the low wind resistance cooling tower cooling triangle unit shown in Example 1, this embodiment further optimizes the structure of the flying wing fin tube 11.

[0059] It can be understood that the relative position relationship between the multiple flying wing fins 12 on the flying wing fin tube 11 also affects the heat transfer effect of the overall flying wing fin tube 11. In this embodiment, the multiple flying wing fins 12 can be selected to be evenly spaced and parallel to each other, so that cold air or other fluids flow between the fins, which is conducive to promoting uniform heat transfer, reducing local overheating or overcooling, and improving heat exchange efficiency.

[0060] In addition, the radiant heat between the flying wing fin 12 and the flying wing fin tube 11 is related to the solid angle between them. Based on the low wind resistance cooling tower cooling triangle unit shown in Example 1, the angle between the flying wing fin 12 and the flying wing fin tube 11 can be selected as an acute angle or a right angle. In this embodiment, the flying wing fin 12 of the flying wing fin tube 11 can be selected to be perpendicular to the flying wing fin tube 11, which not only improves the radiation heat exchange effect, but also further reduces the wind resistance of the cold air flow.

[0061] It should be noted that the present embodiment does not limit the specific shape of the flying wing fin 12, for example, it can be selected as a straight type, an arc type or a wave type, which can be selected according to the needs in the specific working conditions. The present embodiment does not limit the material of the flying wing fin tube 11, and it can be selected as an aluminum alloy flying wing fin tube 11, such as a flying wing fin tube 11 made of 1 to 6 series industrial aluminum profiles, which not only reduces the overall weight of the air-cooled heat exchanger 1, but also reduces the difficulty of processing the flying wing fin 11.

[0062] In addition, based on the low wind resistance cooling tower cooling triangle unit shown in Example 1, the flying wing fin tubes 11 are arranged in one or more rows along the width direction of the heat exchanger, thereby meeting the heat exchange requirements of more working conditions.

[0063] Based on the low wind resistance cooling tower cooling triangle unit shown in Example 1, the relative position relationship of adjacent flying wing fin tubes 11 in the air-cooled heat exchanger 1 is not restricted, and can be optionally staggered, so as to adapt to the heat exchange requirements of more medium working conditions through the staggered arrangement of adjacent flying wing fin tubes 11.

[0064] Based on the low wind resistance cooling tower cooling triangle unit shown in Example 1, the narrow side of the flying wing fin tube 11 in the air-cooled heat exchanger 1 is a plane or an arc surface, that is, the cross-section of the flying wing fin tube 11 can be selected as a square flat tube or a round flat tube, which can be selected according to needs in the specific process.

[0065] Example 4

[0066] Based on the low wind resistance cooling tower cooling triangle unit shown in Example 1, the structure of the air intake grille 2 is also explored and optimized in this embodiment.

[0067] Optionally, the air intake grille 2 is a louver. The louver has two states: open and closed. In actual operation of the cooling triangle unit, the open louver guides the cold air to flow toward the center of the cooling tower after passing through the air intake grille 2.

[0068] Further optionally, the louver is a horizontal louver or a vertical louver, and a horizontal louver is further preferred, that is, the louver blades are arranged horizontally. The louver-type air intake grille (preferably a horizontal louver) can adjust the air flow distribution, reduce local turbulence, and complement the fin tubes arranged downwind. At the same time, the upper sealing plate 31 and the lower sealing plate 32 close the non-flow channel area of ​​the cooling triangle unit to prevent cold air leakage and ensure that the airflow is concentrated through the heat exchange area. This combined design not only improves the air utilization efficiency, but also enhances the structural stability.

[0069] It should be noted that the above contents are further detailed descriptions of the present invention in combination with specific implementation methods, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions; the dimensional data of this embodiment does not limit the technical solution, but only shows one of the specific working conditions. For ordinary technicians in the technical field to which the present invention belongs, several simple improvements and modifications can be made without departing from the concept of the present invention, which should be regarded as falling within the scope of protection of the present invention.

Claims

1. A low wind resistance cooling tower cooling triangle unit, characterized in that: The front end face of the cooling triangle unit is provided with an air intake grille for inputting cold air, and the first side end face and the second side end face are two air-cooling heat exchangers connected in a V shape; cooling water is input into the air-cooling heat exchanger to exchange heat with the cold air and then cool down, and the cold air flows into the axial direction of the cooling tower after heat exchange with the air-cooling heat exchanger; it also includes an upper sealing plate arranged at the upper part and a lower sealing plate arranged at the lower part; Among them, the air-cooled heat exchanger is provided with a plurality of parallel-arranged flying wing fin tubes, the flying wing fin tubes are flat tubes, and two opposite wide surfaces thereof are provided with flying wing fins; the flying wing fin tubes are arranged downwind along the flow direction of the cold air.

2. The low wind resistance cooling tower cooling triangle unit according to claim 1, characterized in that: The included angle between the first side end face and the second side end face is a vertex angle θ, and the included angle α between the flying wing fin tube and the first side end face or the second side end face satisfies: α=1 / 2θ±5°.

3. The low wind resistance cooling tower cooling triangle unit according to claim 2, characterized in that: α=1 / 2θ.

4. The low wind resistance cooling tower cooling triangle unit according to claim 2 or 3, characterized in that: The value range of the vertex angle θ satisfies 60°≤θ≤90°.

5. The low wind resistance cooling tower cooling triangle unit according to claim 1, characterized in that: The flying wing fins are perpendicular to the flying wing fin tubes.

6. The low wind resistance cooling tower cooling triangle unit according to claim 1, characterized in that: The air intake grille is a louver; the louver is a horizontal louver or a vertical louver.

7. A low wind resistance cooling tower, characterized in that: The invention comprises a low wind resistance cooling tower cooling triangle unit as described in any one of claims 1 to 6.

8. A cooling method for a low wind resistance cooling tower, characterized in that: The cooling water carrying waste heat from the upstream process is input into the air-cooled heat exchanger on the side end face of the cooling triangle unit of the cooling tower, and exchanges heat with the cold air input from the front end face of the cooling triangle unit; the cooled cooling water is output from the air-cooled heat exchanger and then returns to the upstream process, and the cold air continues to flow toward the axial direction of the cooling tower after heat exchange and is finally output from the cooling tower; Among them, the air-cooled heat exchanger is provided with a plurality of parallel-arranged flying wing fin tubes, the flying wing fin tubes are flat tubes, and the relative wide surfaces thereof are provided with flying wing fins; the flying wing fin tubes are arranged downwind along the flow direction of the cold air.

9. The cooling method of the low wind resistance cooling tower according to claim 8, characterized in that: The included angle between the two side end faces of the cooling triangle unit is the vertex angle θ, and the included angle α between the flying wing fin tube and the side end face satisfies: α=1 / 2θ±5°.

10. The cooling method of the low wind resistance cooling tower according to claim 8 or 9, characterized in that: The heat transfer coefficient of the air-cooled heat exchanger is related to the mass flow rate of the cold air on its windward side and the cooling water flow rate in the flying wing fin tube as follows: K=38.7466v a 0.212 in w 0.088 ; Where, 1.0≤v a ≤5.0,0.7≤v w ≤1.6; v a is the wind speed on the heat exchanger, m / s; v w is the water flow velocity in the pipe, m / s; K is the heat transfer coefficient of the radiator, W / (m 2 ·℃).

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