An anti-freezing device and method for an indirect air-cooling system

Abstract

The present invention provides an anti-freezing device and method for an indirect air-cooling system, which relates to the technical field of thermal power generation. It can make full use of the existing heat dissipation triangle structure to arrange the anti-freezing device, and achieve full or partial covering of the outer surface of the radiator; through the optimized setting of the anti-freezing device, its retraction and extension are smooth, flexible and adjustable; the anti-freezing device includes a driving device and an anti-freezing curtain; the driving device is arranged on the widening platform; the upper end of the anti-freezing curtain is arranged at the outer end of the widening platform, and the bottom is wound around the movable reel; the movable reel vertically drops outside the widening platform support and is connected to the driving device through a traction belt; cable guys for tightening the anti-freezing curtain are arranged on both sides of the anti-freezing curtain, and the bottom ends of the cable guys are hung on hooks arranged on the ground at the bottom of the widening platform support. The technical solution provided by the present invention is applicable to the process of anti-freezing of the radiator in the air-cooling system.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal power generation, and in particular to an anti-freezing device and method for an indirect air-cooling system.

Background Art

[0002] The indirect air-cooling system is a surface air-cooling heat exchange system. The technological process is that the exhaust steam of the steam turbine is cooled by the circulating water system, and the heated circulating water is cooled by air-cooling heat exchange through the radiators of the cooling triangles in each fan section around the natural draft cooling tower. The cooled circulating water then returns to the condenser to cool the exhaust steam of the steam turbine, and a closed-loop system is formed in this process.

[0003] In winter with low temperatures, the unit will dynamically cool and adjust according to the load. When the return water temperature of some fan section radiators in the indirect air-cooling system drops to the anti-freezing protection temperature, some or all of the fan sections need to be cut off, and the cut-off fan sections need to complete the drainage operation. Since the louver is a mechanical opening and closing structure, there will be a situation where it cannot be closed tightly. At the same time, because the radiator wall is very thin, the radiators in the fan sections with low-temperature drainage are extremely prone to local freezing and cracking accidents.

[0004] In response to such problems, an anti-freezing curtain covering scheme has been proposed. Its basic operating principle is to use an anti-freezing curtain to unfold and retract by means of a reel traction to achieve the purpose of anti-freezing covering. However, due to the large tower suction force of the natural draft cooling tower, when the tower suction force and strong wind act on the louver together, the anti-freezing curtain is closely attached to the louver, and it is very difficult to unfold, and the problem of unsmooth operation of the anti-freezing curtain cannot be solved.

[0005] Therefore, it is necessary to study an anti-freezing device and method for an indirect air-cooling system to address the deficiencies of the existing technology and solve or mitigate one or more of the above problems.

Summary of the Invention

[0006] In view of this, the present invention provides an anti-freezing device and method for an indirect air-cooling system, which can make full use of the existing heat dissipation triangle structure to arrange the anti-freezing device and achieve full or partial covering of the outer surface of the radiator; through the optimized setting of the anti-freezing device, its retraction and deployment are smooth and flexibly adjustable.

[0007] On the one hand, the present invention provides an anti-freezing device for an indirect air-cooling system, characterized in that the anti-freezing device includes a driving device and an anti-freezing curtain; the driving device is arranged on the widening platform; the upper end of the anti-freezing curtain is arranged at the top outside of the widening platform, and the bottom is wound around the movable reel; the anti-freezing curtain droops outside the widening platform bracket under the action of gravity and is connected to the driving device through a traction belt.

[0008] For the aspects and any possible implementation manners as described above, a further implementation manner is provided. Cable guys for tightening the anti-freezing curtain are provided on both sides of the anti-freezing curtain, and the bottom ends of the cable guys are hooked to hooks provided on the ground at the bottom of the widened platform support.

[0009] For the aspects and any possible implementation manners as described above, a further implementation manner is provided. The driving device is provided on a driving device support member, and the driving device support member is vertically arranged above the outer end of the widened platform, forming a right triangle with the top plane of the widened platform support.

[0010] For the aspects and any possible implementation manners as described above, a further implementation manner is provided. The driving device support member is reinforced by a plurality of support steel frames. One end of the support steel frame is connected to the driving device support member, and the other end is connected to the upper surface of the widened platform.

[0011] For the aspects and any possible implementation manners as described above, a further implementation manner is provided. The cable guys are embedded in the anti-freezing curtain.

[0012] For the aspects and any possible implementation manners as described above, a further implementation manner is provided. The connection manner between the cable guys and the anti-freezing curtain is to alternately use embedding and non-embedding. The embedding specifically means that the cable guys are embedded in the anti-freezing curtain. The non-embedding specifically means that the cable guys are arranged on the outer surface of the anti-freezing curtain.

[0013] For the aspects and any possible implementation manners as described above, a further implementation manner is provided. The driving device includes a driving shaft arranged parallel to the movable reel and a motor for driving the driving shaft to rotate. The traction belt is wound around the driving shaft. The bottom end of the traction belt is fixedly connected to the movable reel.

[0014] For the aspects and any possible implementation manners as described above, a further implementation manner is provided. The number of the traction belts is two, which are respectively wound around both ends of the driving reel.

[0015] For the aspects and any possible implementation manners as described above, a further implementation manner is provided. The dead weight of the movable reel meets the requirement for the anti-freezing curtain to droop.

[0016] For the aspects and any possible implementation manners as described above, a further implementation manner is provided. The anti-freezing device further includes a controller, and the controller is respectively connected to the driving device and the anti-freezing curtain positioning device.

[0017] For the aspects and any possible implementation manners as described above, a further implementation manner is provided. The anti-freezing curtain positioning device is an encoder.

[0018] On the other hand, the present invention provides a method for retracting and extending an anti-freezing curtain applicable to an indirect air-cooling system, characterized in that the method is applicable to any one of the anti-freezing devices described above;

[0019] The steps of the method include:

[0020] S1. The controller receives the position information of the anti-freezing curtain located by the anti-freezing curtain positioning device;

[0021] S2. The controller controls the driving device to perform retracting and extending actions according to the retracting / extending command and the current position of the anti-freezing curtain.

[0022] In the above-described aspect and any possible implementation manner, a further implementation manner is provided. If the position of the current anti-freezing curtain is located at the lowest end and it is a command to retract the anti-freezing curtain, the staff is prompted to manually release the connection between the guy wire and the hook.

[0023] In the above-described aspect and any possible implementation manner, a further implementation manner is provided. If the current command is to lower the anti-freezing curtain and it is lowered to the lowest end, the staff is prompted to manually hook the guy wire on the hook.

[0024] In the above-described aspect and any possible implementation manner, a further implementation manner is provided. It is also possible to adopt an automated method to determine whether the guy wire and the hook are in a hooked state; this automated method can be that a smart spring is connected to the lower end of the hook, the current elastic force of the spring is measured, and it is determined whether it is in a hooked state according to the elastic force; if it is in a hooked state and the current command is to retract the anti-freezing curtain, a prompt is issued.

[0025] Compared with the prior art, the present invention can achieve the following technical effects: The anti-freezing device is arranged by using the original widening platform and other structures, with a simple structure form, convenient connection to the steel platform, smooth and flexible retracting and extending operations, and adjustable; when in use, it can ensure the smooth retracting and extending of the anti-freezing curtain, and can also perform all or partial covering operations according to process requirements; it solves the problems that after the shutters are closed in winter, due to the large wind pressure and tower suction force on the surface of the radiator, the anti-freezing curtain is not easy to fall, retract, and the retracting and extending of the anti-freezing curtain is inconvenient.

[0026] Of course, it is not necessary for any product implementing the present invention to achieve all the above-described technical effects simultaneously.

Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0028] Figure 1 It is an elevation layout diagram of an indirect air-cooled radiator structure and an anti-freezing curtain device provided by an embodiment of the present invention;

[0029] Figure 2 It is a schematic diagram of the fixing method of the anti-freezing curtain extended to the ground provided by an embodiment of the present invention;

[0030] Figure 3 It is a schematic diagram of the internal structure of the control box provided by an embodiment of the present invention;

[0031] Figure 4 It is a schematic elevation structure diagram of an indirect air-cooled tower provided by an embodiment of the present invention;

[0032] Figure 5 It is a schematic plan structure diagram of an indirect air-cooled tower provided by an embodiment of the present invention;

[0033] Figure 6 It is a schematic diagram of the specific structure of the radiator provided by an embodiment of the present invention.

[0034] Among them, in the figure:

[0035] 1. Widening platform; 2. Support steel frame; 3. Driving device; 4. Anti-freezing curtain; 5. Movable reel; 6. Hook; 7. Guy wire; 8. Traction belt; 9. Control box; 10. Widening platform bracket; 11. Driving device support; 12. Radiator; 13. Louver.

Specific Embodiment

[0036] In order to better understand the technical solution of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0037] It should be clear that the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work shall fall within the protection scope of the present invention.

[0038] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms of "a", "the" and "said" used in the embodiments of the present invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0039] Aiming at the deficiencies of the prior art, the present invention provides an anti-freezing device for an indirect air-cooling system to achieve the purpose of simple structure, smooth operation and flexible adjustment.

[0040] The anti-freezing device of the present application is put into use when draining water in the fan section of the indirect air-cooling system in winter or when it is necessary to protect the outer surface of the radiator 12 in other situations. The anti-freezing curtain system adopts a vertical dropping type and can completely or partially cover the outer surface of the radiator 12.

[0041] The anti-freezing curtain is wound around a movable scroll. Both ends of the movable scroll are connected to the top driving device through traction belts, and the driving device is fixed to the indirect air-cooling widening platform through a support steel frame. The anti-freezing curtain is unfolded by guiding the movable scroll through the traction belt and unfolds and drops by virtue of the self-weight of the anti-freezing curtain and the movable scroll.

[0042] After the anti-freezing curtain is fully unfolded to the ground, it is tightened on the surface of the louver through a guy wire in the vertical direction, and the lower part of the guy wire is fixed to a hook reserved on the ground. When the anti-freezing curtain needs to be retracted, the guy wire is loosened from the hook, and the traction belt drives the movable scroll through the driving device to roll up the anti-freezing curtain to the top of the radiator 12. The guy wire is of a self-embedded form for the anti-freezing curtain, is wound around the movable scroll together with the anti-freezing curtain, and unfolds and retracts together with the anti-freezing curtain. The guy wire can be fully embedded in the anti-freezing curtain or partially embedded; when partially embedded, it is preferably in an alternating use mode of embedded and non-embedded to ensure the fitting degree between the guy wire and the anti-freezing curtain; the non-embedded structure is specifically that the guy wire is perpendicular to the outer surface of the anti-freezing curtain.

[0043] A control box is used to realize the control of the retraction and extension operation of the anti-freezing curtain and the feedback of the retraction and extension position.

[0044] As Figure 1 shown, the driving device 3 of the anti-freezing curtain 4 is located at the top of the heat dissipation triangle. The driving device 3 is arranged on the driving device support 11. The driving device support 11 is vertically arranged on the upper surface of the outer end of the widening platform and is fixed to the widening platform through a support steel frame 2. The support steel frame 2 and the widening platform and the driving device support 11 form a right triangle, and the control box 9 is placed at this triangle. For balance and stability, a plate body can be extended outward at the bottom of the driving device support 11, and this plate body is arranged on the upper end surface of the widening platform support 10. Since the top positions of the indirect air-cooling radiators 12 are all provided with widening platforms 1 (the indirect air-cooling radiators 12 are arranged along the circumference of the indirect air-cooling tower, and the widening platforms 1 are arranged around the circumference of the top of the radiators 12, as Figure 4-5As shown in the figure, this form of structure is simple and convenient for inspection. The widened platform support 10 is vertically arranged, and its top is connected to the outer end of the widened platform 1, playing a role in supporting the widened platform. The top of the anti-freezing curtain 4 is fixed to the outer end of the widened platform, and the bottom of the anti-freezing curtain 4 is wound around the movable reel 5. The movable reel 5 is placed outside the widened platform support 10 and its position changes with the unfolding length of the anti-freezing curtain. Both ends of the movable reel 5 are connected to the driving device 3 through the traction belts 8. During use, the driving device 3 drives the traction belts 8 to guide the movable reel 5 to wind and unwind. The motor shaft and the driving shaft are fixedly connected. It can be that two motors are respectively fixedly connected to both ends of the driving shaft to drive the two ends of the driving shaft to rotate clockwise and counterclockwise synchronously. The two traction belts are respectively wound around the driving shaft, and the winding and unwinding, that is, the length adjustment, are realized with the rotation of the driving shaft. The bottom end of the traction belt is fixedly connected to the movable reel, thereby realizing the rolling up and rolling down of the movable reel. The driving device 3 is arranged on the driving device support member and has a certain height, so that the traction belt 8 will not drop vertically at a right angle, thus ensuring the smoothness of the winding and unwinding of the traction belt, reducing wear and extending the service life. The control box 9 is connected to the driving device motor and the encoder installed on the driving shaft through cables. The encoder records the number of revolutions of the driving shaft and is used to realize the position feedback of the anti-freezing curtain. The encoder is used to record the number of turns of the driving device rotation. The position of the anti-freezing rolling curtain can be obtained through calculation by the controller. Other devices can also be used to position the anti-freezing curtain according to needs. At the same time, a remote communication interface is provided in the control box 9, which can communicate with the upper computer to realize remote operation and control. As Figure 3 As shown in the figure, a controller, a circuit breaker, a contactor, a relay, etc. are arranged in the control box. The control box is communicatively connected to the motor and the encoder and is used for the operation control of the overall system. The controller is used to issue instructions for controlling the winding / unwinding of the anti-freezing rolling curtain, receive instructions from the upper computer and the position feedback of the anti-freezing curtain. Circuit breaker, contactor, relay and other components are used for circuit connection and control.

[0045] In order to ensure that the anti-freezing curtain can descend smoothly as required, some current practices are to add tracks at both ends of the anti-freezing curtain to make the anti-freezing curtain descend along the preset track. However, due to the large radial suction force of the indirect cooling tower, there will be a large frictional force between the anti-freezing curtain and the track during the unfolding process, and it is very difficult to fall freely. The form of the movable reel and the anti-freezing curtain in this application is not restricted by the track and has no frictional force, and can fall by virtue of the gravity of the movable reel and the anti-freezing curtain. Therefore, it can ensure the smooth winding and unwinding of the anti-freezing curtain, and the unfolding and folding operations are smoother. In the actual implementation process, the weight of the movable reel can be appropriately increased according to the situation. For example, it can be prepared with a material of higher density, or the thickness of the movable reel can be appropriately increased to make it have sufficient gravity, or other weight-increasing methods can be used.

[0046] As Figure 2 shown in the figure, after the anti-freezing curtain 4 is fully unfolded to the ground, the anti-freezing curtain 4 is tightened on the surface of the louvers 13 of the indirect cooling radiator 12 through the guy ropes 7 in the vertical direction (the position of the louvers 13 is asFigure 6 As shown in the figure, the lower part of the guy wire 7 is fixedly connected to the hook 6 reserved on the ground. This can prevent the wind suction force on the leeward side from lifting the anti-freezing curtain 4. This application has the characteristics of less modification to the original unit and its structure, relatively less renovation work, short construction period, and relatively less investment, ensuring smooth actual use and operation. At the same time, the wind load on the triangular part of the radiator will not be affected by the anti-freezing curtain, and the structure and use of the air-cooled equipment will not be affected at any process node during the use state of the anti-freezing curtain.

[0047] The above has introduced in detail an anti-freezing device and method for an indirect air-cooling system provided by an embodiment of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

[0048] As used in the specification and claims, certain terms are used to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not use the difference in names as a way to distinguish components, but use the difference in functions of components as the criterion for distinction. As mentioned throughout the specification and claims, "comprising" and "including" are open-ended terms, so they should be interpreted as "including / including but not limited to". "Substantially" means within an acceptable error range. Those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect. The subsequent description in the specification is the preferred implementation manner for implementing the present application, but the description is for the purpose of explaining the general principle of the present application and is not used to limit the scope of the present application. The protection scope of the present application shall be determined by the scope defined by the appended claims.

[0049] It should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a commodity or system including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such a commodity or system. Without further limitation, the element defined by the statement "including one..." does not exclude the existence of another identical element in the commodity or system including the said element.

[0050] It should be understood that the term "and / or" used herein is only a relational term describing the associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0051] The foregoing description has shown and described several preferred embodiments of the present application. However, as previously mentioned, it should be understood that the present application is not limited to the forms disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications, and environments, and can be changed within the scope of the application concept described herein through the above teachings or the techniques or knowledge in related fields. Any changes and variations made by those skilled in the art without departing from the spirit and scope of the present application shall fall within the protection scope of the appended claims of the present application.

Claims

1. An anti-freezing device for an indirect air cooling system, characterized in that The anti-freezing device includes a driving device and an anti-freezing curtain; the driving device is arranged on the widening platform; the upper end of the anti-freezing curtain is arranged at the outer top of the widening platform, and the bottom is wound around the movable reel; the anti-freezing curtain droops outside the widening platform support under the action of gravity and is connected to the driving device through a traction belt; Guy ropes for tightening the anti-freezing curtain are respectively arranged on both sides of the anti-freezing curtain, and the bottom ends of the guy ropes are hooked to hooks arranged at the bottom of the widening platform support; At least part of the guy rope is embedded in the anti-freezing curtain; The connection mode of the guy rope and the anti-freezing curtain is to alternately use embedding and non-embedding; the embedding specifically means that the guy rope is embedded in the anti-freezing curtain; the non-embedding specifically means that the guy rope is arranged on the surface of the anti-freezing curtain.

2. The anti-freezing device for an indirect air-cooling system according to claim 1, characterized in that, The driving device is arranged on a driving device support member, and the driving device support member is vertically arranged above the outer end of the widening platform and forms a right triangle with the top plane of the widening platform support.

3. The anti-freezing device for an indirect air cooling system according to claim 2, characterized in that, The driving device support member is reinforced by a plurality of support steel frames, one end of the support steel frame is connected to the driving device support member, and the other end is connected to the upper surface of the widening platform.

4. The anti-freezing device for an indirect air-cooling system according to claim 2, wherein The driving device includes a driving shaft arranged parallel to the movable reel and a motor for driving the driving shaft to rotate, and the traction belt is wound around the driving shaft; the bottom end of the traction belt is fixedly connected to the movable reel.

5. The anti-freezing device for an indirect air-cooling system according to claim 4, characterized in that, The number of the traction belts is two, and they are respectively wound around both ends of the driving shaft.

6. The anti-freezing device for an indirect air cooling system according to claim 1, characterized in that, The anti-freezing device further includes a controller, and the controller is respectively connected to the driving device and the anti-freezing curtain positioning device.

7. A method for retracting and deploying an anti-freezing curtain applicable to an indirect air-cooling system, characterized in that, The method is applicable to the anti-freezing device as described in any one of claims 1-6; The steps of the method include: S1. The controller receives the position information of the anti-freezing curtain located by the anti-freezing curtain positioning device; S2. The controller controls the driving device to perform retracting and extending actions according to the retracting and extending command and the current position of the anti-freezing curtain.

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