A louvered air cooled condenser

Abstract

The embodiment of the present disclosure provides a louver air-cooled condenser, comprising: a steam turbine, an air-cooled island communicated with an exhaust outlet of the steam turbine, a condensate tank communicated with a condensate outlet of the air-cooled island, a support structure for supporting the air-cooled island, and a louver installed at the outer periphery of the support structure and having rotatable blades; further comprising: a sensor assembly for collecting environmental parameters, a control device electrically connected with the sensor assembly, and a driving device electrically connected with the control device and further connected with the blades; wherein the control device controls the driving device to adjust the opening and closing angle of the blades according to the sensing data of the sensor assembly, so as to adjust the cold air flow entering the air-cooled island.

Description

Technical Field

[0001] The embodiments disclosed herein belong to the technical field of power plant cooling systems, specifically relating to a louvered air-cooled condenser. Background Technology

[0002] Direct air cooling technology is widely used in coal-rich but water-scarce regions. A direct air cooling system, also known as an air-cooled system, is an effective way to reduce turbine exhaust parameters and improve turbine efficiency by using air instead of water as the cooling medium.

[0003] The advantages of direct air-cooled systems lie in their simplicity, lower investment, and smaller footprint. However, their operation is severely affected by weather conditions, especially strong winds. When the ambient crosswind speed exceeds 3 m / s, the airflow direction is perpendicular to the axial flow fan axis, causing a decrease in the fan inlet static pressure. This easily leads to "hot air recirculation" and "backflow," resulting in increased inlet air temperature and reduced cooling flow. This is particularly problematic for fans located upstream in the wind farm, where dynamic performance significantly deteriorates. Consequently, the heat transfer performance of the air-cooled unit's finned tube bundle also deteriorates sharply, reducing heat exchanger efficiency. Ultimately, this increases fan load, plant power consumption, and may even lead to abnormal shutdowns. Furthermore, low winter temperatures can cause condensation and freezing in the pipes. These issues all affect the safe, economical, and efficient operation of direct air-cooled units.

[0004] Therefore, how to solve the above problems has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The embodiments disclosed herein are intended to at least address one of the technical problems existing in the prior art, and to provide a louvered air condenser.

[0006] One aspect of the embodiments of this disclosure provides a louvered air-cooled condenser, comprising: The system includes a steam turbine, an air-cooled island connected to the exhaust outlet of the steam turbine, a condensate tank connected to the condensate outlet of the air-cooled island, a support structure for supporting the air-cooled island, and louvers with rotatable blades installed on the outer periphery of the support structure; it also includes: A sensor assembly for collecting environmental parameters, a control device electrically connected to the sensor assembly, and a drive device electrically connected to the control device and also connected to the blade drive. The control device controls the drive device to adjust the opening and closing angle of the blades based on the sensing data of the sensor assembly, so as to regulate the flow rate of cold air entering the air-cooled island.

[0007] Optionally, the air-cooled island includes a heat exchange finned tube bundle connected to the exhaust outlet of the steam turbine, and an axial flow fan corresponding to the heat exchange finned tube bundle.

[0008] Optionally, the heat exchange finned tubes in the heat exchange finned tube bundle have a Λ-shaped cross-section.

[0009] Optionally, the support structure includes a truss platform supporting the air-cooled island and support columns supporting the truss platform.

[0010] Optionally, the sensor assembly includes a wind speed sensor and a wind direction sensor electrically connected to the control device, wherein the control device controls the drive device to adjust the opening angle of the blades based on the wind speed data detected by the wind speed sensor and / or the wind direction data detected by the wind direction sensor.

[0011] Optionally, the blade has a pivot; The drive device includes an electric motor electrically connected to the control device, and a transmission rack that is drively connected to the output shaft of the electric motor and meshes with the rotating shaft.

[0012] Optionally, the louver includes a frame and a plurality of blades arranged in an array and rotatably on the frame.

[0013] Optionally, the blade has a curved cross-section that is thicker in the middle and thinner at both ends.

[0014] Optionally, the blade surface is covered with an anti-corrosion layer formed by hot-dip galvanizing, hot-dip aluminizing, or anti-corrosion coating.

[0015] Furthermore, it also includes a solar power supply unit, which integrates a battery connected to the sensor assembly.

[0016] The beneficial effects of the embodiments of this disclosure include: The louvered blades are adjustable. In low-wind environments, the opening angle can be increased to allow sufficient cold air to enter the condenser and cool the steam. In high-wind environments, the opening angle can be decreased to break the low-pressure environment at the fan inlet, preventing hot air backflow and reducing the load on the axial fan, thus reducing coal consumption for power generation and improving the unit's energy efficiency. Furthermore, in cold winter weather, low air temperatures can easily cause condensate in the pipes to freeze. Closing the louvers prevents cold air from entering the condenser, which is beneficial for the safe operation of the air-cooled unit. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a louvered air condenser according to an embodiment of the present disclosure; Figure 2 This is a schematic diagram of the structure of a louver according to an embodiment of the present disclosure; Figure 3 This is a schematic diagram of the partial structure connecting the blade and the drive device according to an embodiment of the present disclosure.

[0018] In the diagram, 1 is the steam turbine; 2 is the air-cooled island; 3 is the condensate tank; 4 is the supporting structure; 5 is the louver; 6 is the transmission rack; 21 is the heat exchange finned tube bundle; 41 is the support column; 51 is the frame; 52 is the blade; and 521 is the shaft. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solutions of this disclosure, the disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] The embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. The detailed descriptions and accompanying drawings of the following embodiments are used to exemplarily illustrate the principles of this application, but should not be used to limit the scope of this application; that is, this application is not limited to the described embodiments. In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicating orientation or positional relationships are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0021] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances.

[0022] like Figure 1-3 As shown, a louvered air-cooled condenser includes: a steam turbine 1, an air-cooled island 2 connected to the exhaust outlet of the steam turbine 1, a condensate tank 3 connected to the condensate outlet of the air-cooled island 2, a support structure 4 for supporting the air-cooled island 2, and louvers 5 installed on the outer periphery of the support structure 4 and having rotatable blades 52. It also includes: A sensor assembly for collecting environmental parameters, a control device electrically connected to the sensor assembly, and a drive device electrically connected to the control device and also drivenly connected to the blade 52.

[0023] The control device controls the drive device to adjust the opening and closing angle of the blades 52 based on the sensing data of the sensor components, so as to regulate the flow rate of cold air entering the air-cooled island 2.

[0024] In this application, the louvered air-cooled condenser uses adjustable louvers 5 installed on the outer periphery of the support structure 4. Combined with sensor components, it monitors environmental parameters in real time, and a control device drives an actuator to adjust the opening angle of the louvers 5 based on the monitoring data. This structure effectively regulates the flow of cold air entering the air-cooled island 2, thereby suppressing "hot air backflow" and "backflow" phenomena in windy weather, reducing the load on the axial fan, and thus reducing plant power consumption.

[0025] In some embodiments, the louvers 5 can be completely closed in winter to prevent condensate from freezing, ensuring the safe operation of the unit and achieving the technical effect of improving the economic efficiency and safety of unit operation.

[0026] In some embodiments, the air-cooled island 2 is equipped with a "Λ"-shaped heat exchange finned tube bundle 21, and an axial flow fan is arranged at the bottom of the tube bundle. The air-cooled island 2 is equipped with a vacuum system for extracting non-condensable gases and air from the condenser, which includes an extraction pipe, a shut-off valve, and a water ring vacuum pump.

[0027] Steam from turbine 1 passes through a large main steam pipe and then flows into the condenser's "Λ"-shaped heat exchange finned tube bundle 21 via a steam distribution pipe. It then engages in convective heat exchange with the cold air, dissipating heat and lowering its temperature. The steam is cooled into water, and the condensate is collected in the condensate tank 3. The condensate is then pressurized by the condensate pump and flows into the boiler for partial recycling.

[0028] Driven by an axial flow fan, the cold air in the environment flows along the axial direction of the fan and into the "Λ"-shaped heat exchange finned tube bundle 21 to exchange heat with hot steam via convection, and then dissipates into the environment. A windbreak wall is also installed outside the air-cooled island 2, which can effectively reduce the impact of hot air recirculation and backflow on the heat exchange of the air-cooled condenser.

[0029] The support structure 4 of the air-cooled island 2 is an important component of the direct air-cooled power plant. The support structure 4 consists of a steel truss platform and a lower reinforced concrete support column 41. Louvers 5 are installed around the support column 41, and the airflow of cold air through the heat exchange fins is adjusted by regulating the opening angle of the louvers 5.

[0030] In some embodiments, the opening angle of the venetian blinds 5 is set between 0° and 90°.

[0031] At a certain distance in the direction of the incoming wind, approximately 500-3000 meters away, at the same height as louver 5, a sensor assembly for collecting incoming wind parameters is installed. This assembly includes a wind speed sensor and a wind direction sensor. In the absence of a power supply, a solar power unit can be used to power the sensor assembly. The solar power unit has a built-in wide-temperature colloidal maintenance-free battery to ensure long-term stable operation.

[0032] Furthermore, the control device includes an outgoing processing center and a DCS control center. Wind direction and speed data are collected, converted into electrical signals, and transmitted back to the power plant's data processing center. The data processing center is connected to the DCS control center, which can control the opening and closing angle of the louver 5's blades 52 via a drive device. Due to the adjustable opening and closing angle of the louver 5's blades 52, this application can reduce the load on the axial flow fan, reduce plant power consumption, and make the unit operate more economically. Simultaneously, closing the louver 5's blades 52 in winter can prevent condensate from freezing in the pipes, pipe bundle blockage, and even finned tube freezing and cracking, making the unit operate more safely.

[0033] In some embodiments, the venetian blinds 5 are divided into several rectangular areas, each with a fixed limiting device around its perimeter. Each rectangular area is 2-4 meters wide, and the support columns 41 are approximately 20-40 meters high. The venetian blinds 5 are divided into four rows along the height direction, with each row of venetian blinds 5 being 5-10 meters high, the specific dimensions depending on the site conditions. The venetian blinds 5 in each area are controlled by a DC motor. The motor rotates forward to increase the angle of the venetian blinds 5, and rotates backward to decrease the angle of the venetian blinds 5, thus achieving automatic angle control of the venetian blinds 5.

[0034] The opening angle of the venetian blind 5 is controlled by a motor driving a transmission rack 6, which in turn rotates the shafts 521 at both ends of the venetian blind 5, thus changing the opening angle of the venetian blind 5. The louver shape of the venetian blind 5 is as follows: Figure 3 As shown, it is curved, thick in the middle and thin at both ends, and has a strong ability to resist deformation. In addition, the thicker shaft 521 with gears in the middle can withstand a large torque and prevent the gear shaft from breaking.

[0035] The basic working process of the louvered type 5 air condenser of this application can be described according to the fluid flow process on the steam side and the air side.

[0036] Steam side: In turbine 1, reducing the exhaust parameters, i.e., creating a higher vacuum at the exhaust port of turbine 1, increases the effective enthalpy drop of steam in turbine 1, thereby significantly improving the cycle thermal efficiency. Exhaust steam from turbine 1 is discharged through the main steam pipeline and then divided into multiple distribution pipelines entering the Λ-shaped heat exchange finned tube bundle 21. The steam releases heat in the finned tubes and condenses into saturated or supercooled condensate, which is collected in the condensate tank 3. After iron removal, the condensate is pressurized and supplied to the boiler by the condensate pump.

[0037] On the air side: The cold air flowing in the environment slows down after passing through the louvers 5, and then flows vertically upward under the drive of the axial flow fan below the air-cooled island 2 into the area below the "Λ"-shaped heat exchange finned tube bundle 21. It flows over the surface of the finned tube bundle for forced convection heat exchange, absorbing the heat released by the high-temperature steam. At the same time, the cold air is heated into hot air and continues to flow upward and dissipate into the atmosphere.

[0038] At a distance of approximately 500-3000 meters upstream in the windward direction, a sensor assembly for collecting incoming wind parameters is installed. This assembly includes wind speed and wind direction sensors. The collected wind direction and wind speed data are transmitted back to the power plant's data processing center. This center is connected to the DCS control center, which calculates the optimal opening angle of the louvers (5) using software simulation. This calculation then controls the motor. The motor's forward rotation drives the gear mechanism, increasing the opening angle of the louvers (5), and vice versa.

[0039] The opening degree of the venetian blind 5 can be adjusted in real time to suit different situations, including: In summer, when there is no wind or little wind, the heat exchange effect is poor due to the high air temperature. Sufficient air is required for heat exchange. When the sensor component located upstream of the wind converts the wind speed and direction signals into electrical signals and transmits them back to the control center, the control center issues a command to control the motor to rotate forward and open the louvers to the maximum extent 5, i.e. 0°.

[0040] In summer, when winds are strong and speeds exceed 3 m / s, the direction of the ambient wind is perpendicular to the axis of the axial fan, causing a decrease in the static pressure at the fan inlet. This can easily lead to "hot air backflow" and "backflow," reducing heat exchanger efficiency, increasing plant power consumption, and even causing abnormal shutdowns in extreme high-temperature weather. When the sensor components located upstream of the wind transmit wind speed and direction signals back to the control center, the control center can calculate the most favorable louver opening size for the heat exchanger. The control center then sends a command to the motor, which rotates to open the louvers by 5 degrees, effectively preventing "hot air backflow" and "backflow," reducing plant power consumption, and improving unit efficiency.

[0041] In low-temperature winter weather, excessively low air temperatures and excessively high heat exchanger performance can significantly increase heat exchange capacity, easily causing condensate in the pipes to freeze, and even leading to blockage of the heat exchange finned tube bundle 21 or deformation and freezing cracking of the finned tubes. When the sensor assembly located upstream of the wind transmits wind speed and direction signals back to the control center, the control center sends a command to the motor. The motor reverses, driving the gear mechanism to completely close the blades 52 of the louvers 5 to 90°, preventing supercooled air from entering the condenser and protecting the safe operation of the unit.

[0042] This invention discloses a louvered 5-type air-cooled condenser belonging to the field of power plant cooling systems, comprising a steam turbine 1, an air-cooled island 2, a condensate tank 3, and a support structure 4. Steam exhaust from the turbine 1 enters the "Λ"-shaped heat exchange finned tube bundle 21 through the exhaust pipe, where it undergoes forced convection heat exchange with cold air. The steam then condenses into water, and the saturated condensate flows into the condensate tank 3. After being pressurized by the condensate pump, it is sent to the boiler section. This invention installs louvers 5 around the support column 41. The louvers 5 are divided into multiple areas, and a sensor assembly for wind parameter acquisition is installed in the direction of the incoming wind. The opening angle of the louvers 5 is selected based on the wind parameters. While maintaining the advantages of existing air-cooled units, this invention improves upon their disadvantages, reduces the load on the axial flow fan, reduces plant power consumption, and makes the unit operate more economically. Simultaneously, in winter, closing the louvers 5 prevents condensate from freezing in the pipes, tube bundle blockage, and even finned tube freezing and cracking, making the unit operate more safely.

[0043] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this disclosure, and these modifications and improvements are also considered to be within the scope of protection of this disclosure.

Claims

1. A louvered air-cooled condenser, characterized in that, include: The system includes a steam turbine, an air-cooled island connected to the exhaust outlet of the steam turbine, a condensate tank connected to the condensate outlet of the air-cooled island, a support structure for supporting the air-cooled island, and louvers with rotatable blades installed on the outer periphery of the support structure; it also includes: A sensor assembly for collecting environmental parameters, a control device electrically connected to the sensor assembly, and a drive device electrically connected to the control device and also connected to the blade drive. The control device controls the drive device to adjust the opening and closing angle of the blades based on the sensing data of the sensor assembly, so as to regulate the flow rate of cold air entering the air-cooled island.

2. The louvered air-cooled condenser according to claim 1, characterized in that, The air-cooled island includes a heat exchange finned tube bundle connected to the exhaust outlet of the steam turbine, and an axial flow fan corresponding to the heat exchange finned tube bundle.

3. A louvered air-cooled condenser according to claim 2, characterized in that, The heat exchange finned tubes in the heat exchange finned tube bundle have a Λ-shaped cross-section.

4. A louvered air-cooled condenser according to claim 1, characterized in that, The support structure includes a truss platform supporting the air-cooled island and support columns supporting the truss platform.

5. A louvered air-cooled condenser according to claim 1, characterized in that, The sensor assembly includes a wind speed sensor and a wind direction sensor electrically connected to the control device, wherein the control device controls the drive device to adjust the opening angle of the blades based on the wind speed data detected by the wind speed sensor and / or the wind direction data detected by the wind direction sensor.

6. A louvered air-cooled condenser according to claim 1, characterized in that, The blade has a pivot; The drive device includes an electric motor electrically connected to the control device, and a transmission rack that is drively connected to the output shaft of the electric motor and meshes with the rotating shaft.

7. A louvered air-cooled condenser according to claim 1, characterized in that, The louver includes a frame and a plurality of blades arranged in an array and rotatably on the frame.

8. A louvered air-cooled condenser according to claim 1, characterized in that, The blade has a curved cross-section that is thicker in the middle and thinner at both ends.

9. A louvered air-cooled condenser according to claim 1, characterized in that, The blade surface is covered with an anti-corrosion layer formed by hot-dip galvanizing, hot-dip aluminizing, or anti-corrosion coating.

10. A louvered air-cooled condenser according to claim 1, characterized in that, Also includes: A solar power supply unit, wherein the solar power supply unit integrates a battery connected to the sensor assembly.

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