A spray cooling device for an indirect cooling tower

Abstract

The utility model relates to the technical field of cooling device, concretely to a kind of intercooling tower spray cooling device, including base, water tank, lifting mechanism, hot air generator and cold air generator, the water tank is set in the base top center, the water tank top side is equipped with liquid inlet component, the water tank top center is equipped with pumping unit, the water tank top other side is equipped with temperature sensor, the lifting mechanism is equipped with two, the lifting mechanism includes recess, telescopic cylinder and connecting plate, the recess is opened in the base top side surface, the telescopic cylinder one end is connected with the recess bottom wall, the telescopic cylinder other end is connected with the connecting plate, the base front is equipped with controller, the controller is electrically connected with the telescopic cylinder, hot air generator and cold air generator are respectively arranged on two lifting mechanisms, the utility model relates to a kind of intercooling tower spray cooling device, solves the problem that current equipment is not convenient to heat or cool water tank.

Description

Technical Field

[0001] This utility model relates to the technical field of cooling devices, specifically to an intercooling tower spray cooling device. Background Technology

[0002] As is well known, the indirect air-cooled tower spray cooling device is a key auxiliary equipment for the indirect air-cooled system (ACC) of thermal power plants. It reduces the air temperature inside the tower by spraying fine water mist at the air inlet area, utilizing the principle of heat absorption through water evaporation, thereby improving the exhaust cooling efficiency of the steam turbine. This device is particularly suitable for hot and arid regions, and can reduce the inlet air temperature of the indirect air-cooled tower by 5-10℃ when the ambient temperature is ≥35℃, resulting in a 2-4kPa reduction in unit back pressure and a 1.5-3g / kWh reduction in coal consumption for power generation.

[0003] However, existing indirect cooling tower spray cooling devices generally lack an active water tank temperature regulation mechanism. Specifically, when the ambient temperature is below 0℃, the water in the tank is prone to freezing due to heat dissipation, which may cause pipes to freeze and crack. When the ambient temperature exceeds 35℃ in summer, the water tank temperature rises to above 40℃, which reduces the water evaporation efficiency and easily causes nozzle scaling. Tests have shown that traditional devices have a 70% probability of water tank freezing at -10℃, and the spray volume needs to be reduced by 25% at 40℃ to maintain equipment operation. This results in a 15%-20% decrease in the cooling effect of the indirect cooling tower intake, which seriously affects the turbine exhaust cooling efficiency and the unit's economy. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides an indirect cooling tower spray cooling device.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a spray cooling device for an indirect cooling tower, comprising a base, a water tank, a lifting mechanism, a hot air generator, and a cold air generator. The water tank is located at the top center of the base. A liquid inlet assembly is provided on one side of the top of the water tank, a pumping assembly is provided at the top center of the water tank, and a temperature sensor is provided on the other side of the top of the water tank. Two lifting mechanisms are provided, each comprising a groove, a telescopic cylinder, and a connecting plate. The groove is formed on the top side of the base. One end of the telescopic cylinder is connected to the bottom wall of the groove, and the other end of the telescopic cylinder is connected to the connecting plate. A controller is provided on the front of the base, and the controller is electrically connected to the telescopic cylinder. A hot air generator and a cold air generator are respectively provided on the two lifting mechanisms. A sealing shell is provided on the outer wall of the water tank, and through holes are provided on both sides of the sealing shell. The hot air generator is electrically connected to the temperature sensor, and the cold air generator is electrically connected to the temperature sensor. A sealing plate is provided at the bottom of both the hot air generator and the cold air generator, and the sealing plate matches the groove.

[0008] To improve the sealing effect, the present invention includes an improvement whereby a sealing strip is provided around the sealing plate, the sealing strip being fixedly connected to the perimeter of the sealing plate, and the sealing strip being made of rubber.

[0009] To improve stability, this utility model is improved by providing two telescopic cylinders inside the groove, and the two telescopic cylinders are arranged symmetrically.

[0010] To facilitate equipment operation, the present invention is improved in that the controller is electrically connected to the pumping assembly.

[0011] To achieve the filtration effect, the present invention is improved by providing a filter screen in the liquid inlet assembly, and the filter screen is connected to the inner wall of the liquid inlet assembly by bolts.

[0012] To improve the strength of the base, this utility model is improved by using alloy steel as the base material.

[0013] (III) Beneficial Effects

[0014] Compared with the prior art, this utility model provides an indirect cooling tower spray cooling device, which has the following beneficial effects:

[0015] This indirect cooling tower spray cooling device features an intelligent temperature regulation and integrated design, significantly improving equipment adaptability and reliability. A temperature sensor monitors the water tank temperature in real time, automatically starting and stopping the hot / cold air generator. It can maintain a water temperature ≥10℃ in -10℃ environments and control the water temperature ≤20℃ at 40℃, preventing freezing or high-temperature scaling. Testing shows an 80% improvement in operational stability under extreme temperatures. The symmetrically arranged double telescopic cylinder lifting mechanism has a synchronization error ≤0.3mm, ensuring the hot / cold air generator is flush with the base when retracted. The flat design, combined with rubber sealing strips, achieves an IP54 protection rating, providing excellent dust and water resistance. The alloy steel base with cross-shaped reinforcing ribs offers a load-bearing capacity of 500kg and good vibration resistance. The anti-corrosion coating extends its outdoor service life to over 15 years. The removable 50-mesh stainless steel filter has a filtration efficiency of ≥95%, extending the maintenance cycle to once per quarter. A single replacement takes only 5 minutes. The overall design enables precise water temperature control, convenient equipment maintenance, and optimized structural strength. Compared to traditional devices, this increases the cooling efficiency of the indirect cooling tower by 15%-20% and reduces energy consumption by 12%. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This utility model Figure 1 A magnified schematic diagram of the local structure at point A;

[0018] Figure 3 This is a schematic diagram of the axonal structure of the present invention;

[0019] Figure 4 This utility model Figure 1 The front view;

[0020] In the diagram: 1. Base; 2. Water tank; 3. Liquid inlet assembly; 4. Pumping assembly; 5. Temperature sensor; 6. Lifting mechanism; 7. Groove; 8. Connecting plate; 9. Hot air generator; 10. Cold air generator; 11. Sealing plate; 12. Controller; 13. Sealing shell. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-4A spray cooling device for an indirect cooling tower includes a base 1, a water tank 2, a lifting mechanism 6, a hot air generator 9, and a cold air generator 10. The water tank 2 is located at the top center of the base 1. A liquid inlet assembly 3 is provided on one side of the top of the water tank 2, and a pumping assembly 4 is provided at the top center of the water tank 2. A temperature sensor 5 is provided on the other side of the top of the water tank 2. Two lifting mechanisms 6 are provided, each including a groove 7, a telescopic cylinder, and a connecting plate 8. The groove 7 is formed on the top side of the base 1, and one end of the telescopic cylinder is connected to the bottom wall of the groove 7. The other end of the telescopic cylinder is connected to the bottom wall of the groove 7. One end is connected to the connecting plate 8. The front of the base 1 is provided with a controller 12, which is electrically connected to the telescopic cylinder. The two lifting mechanisms 6 are respectively provided with a hot air generator 9 and a cold air generator 10. The outer wall of the water tank 2 is provided with a sealing shell 13. The sealing shell 13 has through holes on both sides. The hot air generator 9 is electrically connected to the temperature sensor 5. The cold air generator 10 is electrically connected to the temperature sensor 5. The bottom of both the hot air generator 9 and the cold air generator 10 is provided with a sealing plate 11, which matches the groove 7.

[0023] Working principle: After fixing the equipment in the designated position and connecting it to three-phase mains power, the pumping component 4 is sealed to the external spray pipe of the indirect cooling tower via a flange butt joint (the pipe has a built-in atomizing nozzle with an atomizing particle size of 100-150μm). Figure 1 As shown, the operator activates the symmetrical telescopic cylinder in the groove 7 through the controller 12, which drives the connecting plate 8 to descend, so that the hot air generator 9 and the cold air generator 10 are housed in the groove 7. When the telescopic cylinder is retracted to the limit position, the sealing plate 11 is flush with the surface of the base 1, forming a seal.

[0024] Core functional module working logic

[0025] Operating mechanism of heat exchange system:

[0026] Hot air generator 9: consists of an electric heating element (power 30-50kW) and a centrifugal fan (air volume 2000-3000m³ / h). 3 The system consists of a 5-temperature sensor and a dual temperature sensor (one on the outer wall of the water tank 2 and one at the air outlet). When the ambient temperature is ≤0℃ and the water temperature in the water tank 2 is ≤5℃, the temperature sensor 5 sends a signal to the controller 12 to start the hot air system. Hot air enters the interlayer through the left through hole of the sealing shell 13, flows along the outer wall of the water tank 2 for heat exchange, and is discharged from the right through hole, so that the water temperature is maintained at 10-15℃. When the water temperature is ≥10℃ and the ambient temperature is >5℃, the system automatically stops.

[0027] Cooling generator 10: Includes compressor (cooling capacity 20-40kW), evaporator and axial fan (air volume 3000-5000m³ / h). 3 / h), when the water temperature in water tank 2 is ≥32℃, the sensor triggers the cooling system. Cold air enters through the right through hole of the sealed shell 13, absorbs heat, and is discharged through the left through hole, controlling the water temperature below 20℃; it automatically shuts off after cooling to the threshold.

[0028] Spraying operation process: The water pump (head 60-80m) of pumping component 4 draws water from water tank 2 through the liquid extraction pipe, and delivers it to the cooling tower pipeline through the folded hose, and sprays it towards the air inlet of the tower body through the atomizing nozzle;

[0029] Airflow organization of sealed shell 13: The diameter of the through holes on both sides is 150mm, which are aligned with the air outlet of the hot / cold air generator to form a diagonal airflow circulation. In summer, the cold air flows through the outer wall of the water tank at a speed of 10-15m / s, and in winter, the hot air spirals upward at a speed of 5-8m / s, ensuring that the temperature difference of each surface is ≤1℃.

[0030] Safety design of the storage mechanism: When the hot air generator 9 and the cold air generator 10 descend with the telescopic cylinder, their air outlet end faces remain flush with the side wall of the groove 7. By precisely controlling the stroke of the telescopic cylinder (error ≤ 0.5mm), it is ensured that the air outlet will not exceed the contour range of the groove 7, thereby avoiding obstruction of equipment storage due to structural interference and ensuring the smoothness and safety of the equipment storage process; the fit gap between the sealing plate 11 and the groove 7 is ≤ 0.5mm to prevent dust intrusion;

[0031] Temperature sensor 5 is a PT100 platinum resistance thermometer. Three sampling points (top, middle, and bottom) are vertically arranged inside water tank 2, and one ambient temperature sensor is arranged on the outer wall. The sampling accuracy is ±0.5℃.

[0032] The controller 12 integrates PID regulation function: temperature sampling period of 10s, temperature control accuracy of ±1℃, and has a fault interlock mechanism: when the hot air generator 9 overheats (>60℃) or the cold air system high pressure alarm (>1.8MPa), it automatically cuts off the power and starts the audible and visual alarm. It communicates with the DCS system of the indirect cooling tower to upload data such as water temperature and energy consumption in real time. It supports remote start and stop. The controller 12 supports Modbus RTU protocol, communication baud rate of 9600bps, 8 data bits, 1 stop bit, and no parity bit.

[0033] Water tank 2 is made of 304 stainless steel and has a volume of 50m³. 3 The inner wall is polished (roughness Ra≤1.6μm), and a liquid level sensor is installed at the top (range 0-3m, accuracy ±10mm);

[0034] The sealing shell 13 is made of a 50mm thick polyurethane insulation layer (thermal conductivity ≤0.024W / (m·K)) and wrapped with a 1.5mm thick 304 stainless steel plate, with heat loss ≤5%;

[0035] The equipment grounding resistance is ≤4Ω, the controller 12 has a built-in leakage current protection device (operating current 30mA, operating time ≤0.1s), and all exposed cables are protected by galvanized steel pipe (IP65).

[0036] To achieve a reliable sealing effect, a rubber sealing strip is fixedly connected around the sealing plate 11 in this embodiment. The sealing strip is made of EPDM rubber with a Shore hardness of 60±5HA, which has good elasticity and weather resistance. It can maintain sealing performance in a temperature range of -40℃ to 120℃. The sealing strip has a U-shaped cross-section and is embedded in the groove (groove depth 5mm, width 8mm) on the edge of the sealing plate 11. Through interference fit, it achieves a tight fit with the side wall of the groove 7. The sealing compression is controlled at 1.5-2mm to ensure the sealing performance between the sealing plate 11 and the base 1, effectively preventing dust, moisture and other impurities from entering the groove 7, and improving the reliability and service life of the equipment.

[0037] To improve the stability of equipment operation, this embodiment symmetrically arranges two telescopic cylinders inside the groove 7. The two cylinders are symmetrically distributed on the left and right sides along the center line of the groove 7. Both cylinders are model SC-50×200-S, with a cylinder diameter of 50mm, a stroke of 200mm, a working pressure of 0.4-0.6MPa, and a synchronization error of ≤0.3mm. This symmetrical layout can evenly bear the weight of the hot air generator 9 and the cold air generator 10 (the weight of a single unit is about 40kg), avoiding tilting or jamming caused by unilateral force, ensuring that the verticality tolerance of the connecting plate 8 during the lifting process does not exceed 0.5mm / m, and at the same time controlling the pressure deviation of the cylinders on both sides within 10%, effectively improving the stability and reliability of the lifting mechanism and extending the service life of the cylinder seals.

[0038] To facilitate automated operation of the equipment, in this embodiment, the controller 12 is electrically connected to the pumping assembly. The water pump motor (7.5kW power, IP55 protection rating) in the pumping assembly is connected to the relay module of the controller 12 via a control cable, supporting the following operation functions:

[0039] Start / stop control: The water pump can be started / stopped with a single button by sending commands via the buttons on the controller 12 panel or the touch screen.

[0040] Variable frequency control: Built-in frequency converter (model FR-D700, adjustment range 0-50Hz), which can adjust the water pump speed in real time according to the spray volume requirements, with an accuracy of ±0.5Hz;

[0041] Status monitoring: The controller 12 displays the pump's operating current, voltage, and cumulative operating time in real time. When the current exceeds 110% of the rated value, it automatically triggers overload protection to stop the pump.

[0042] Status monitoring: The controller 12 displays the pump's operating current, voltage, and cumulative operating time in real time. When the current exceeds 110% of the rated value, it automatically triggers overload protection to stop the pump.

[0043] To achieve water filtration, this embodiment incorporates a detachable filter screen inside the liquid inlet assembly 3. This filter screen is made of 304 stainless steel with a mesh size of 50 mesh (0.3mm aperture). It is fixedly connected to the mounting bracket on the inner wall of the liquid inlet assembly 3 using four M6×15 stainless steel bolts. The specific structural design is as follows:

[0044] Disassembly and maintenance mechanism: The bolts can be loosened directly using the matching 6mm Allen wrench, and the filter screen can be removed from the top of the liquid inlet assembly 3. The inner diameter of the liquid inlet assembly 3 is designed to be 120mm and the depth is 150mm to ensure sufficient operating space for the wrench.

[0045] Anti-fall structure: Two L-shaped limiting blocks (20mm×20mm×3mm) are welded to the bottom of the inner wall of the liquid inlet component 3 to form a support step with a height of 10mm, which prevents the filter screen from accidentally falling into the water tank 2 when it is disassembled;

[0046] Sealing design: A silicone sealing ring (5mm in cross-sectional diameter) is set on the contact surface between the filter screen and the liquid inlet component 3, and the bolt tightening torque is controlled at 8-10 N·m to prevent liquid leakage during filtration;

[0047] Filtration effect: It can effectively intercept impurities with a particle size ≥0.3mm in the water (such as silt, rust, etc.), with a filtration efficiency ≥95%, ensuring that the nozzle of the pumping component 4 is not clogged;

[0048] This design, through standardized interfaces and tool adaptation, allows the filter replacement cycle to be controlled to once per quarter, with a single maintenance time of ≤5 minutes. At the same time, the limiting structure and sealing design ensure operational safety and filtration reliability.

[0049] To improve the structural strength and load-bearing capacity of the base 1, in this embodiment, the base 1 is made of Q355B low-alloy high-strength structural steel. This alloy steel contains alloying elements such as manganese and silicon, with a yield strength ≥355MPa and a tensile strength of 510-630MPa. Compared with ordinary carbon steel, the strength is increased by more than 20%, which can effectively bear the total weight (about 500kg) of components such as water tank 2, hot air generator 9, and cold air generator 10, as well as the vibration load during operation. The base 1 is made of 10mm thick steel plate welded together, with a cross-shaped reinforcing rib (thickness 8mm) added to the bottom. After annealing treatment to eliminate welding stress, the surface is sprayed with two coats of epoxy zinc-rich primer (dry film thickness 80μm) and one coat of polyurethane topcoat (dry film thickness 60μm), which has good corrosion resistance and can be used for a long time in outdoor humid environments, with a service life of more than 15 years.

[0050] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A spray cooling device for an indirect cooling tower, comprising a base (1), a water tank (2), a lifting mechanism (6), a hot air generator (9), and a cold air generator (10), characterized in that: The water tank (2) is located at the top center of the base (1). A liquid inlet assembly (3) is provided on one side of the top of the water tank (2). A pumping assembly (4) is provided at the top center of the water tank (2). A temperature sensor (5) is provided on the other side of the top of the water tank (2). Two lifting mechanisms (6) are provided. Each lifting mechanism (6) includes a groove (7), a telescopic cylinder, and a connecting plate (8). The groove (7) is located on the top side of the base (1). One end of the telescopic cylinder is connected to the bottom wall of the groove (7), and the other end of the telescopic cylinder is connected to the connecting plate (8). A control panel is provided on the front of the base (1). The controller (12) is electrically connected to the telescopic cylinder. The two lifting mechanisms (6) are respectively equipped with a hot air generator (9) and a cold air generator (10). The outer wall of the water tank (2) is provided with a sealing shell (13). The sealing shell (13) has through holes on both sides. The hot air generator (9) is electrically connected to the temperature sensor (5). The cold air generator (10) is electrically connected to the temperature sensor (5). The bottom of the hot air generator (9) and the cold air generator (10) are both provided with a sealing plate (11). The sealing plate (11) matches the groove (7).

2. The indirect cooling tower spray cooling device according to claim 1, characterized in that: The sealing plate (11) is provided with a sealing strip around its perimeter. The sealing strip is fixedly connected to the perimeter of the sealing plate (11) and is made of rubber.

3. The indirect cooling tower spray cooling device according to claim 2, characterized in that: The groove (7) contains two telescopic cylinders, which are arranged symmetrically.

4. The indirect cooling tower spray cooling device according to claim 3, characterized in that: The controller (12) is electrically connected to the pumping assembly.

5. The indirect cooling tower spray cooling device according to claim 4, characterized in that: The liquid inlet assembly (3) is equipped with a filter screen, which is connected to the inner wall of the liquid inlet assembly (3) by bolts.

6. The indirect cooling tower spray cooling device according to claim 5, characterized in that: The base (1) is made of alloy steel.

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