A dual-mode steam turbine cylinder cooling device and use method

Abstract

The present invention relates to the technical field of cooling, and discloses a dual-mode steam turbine cylinder cooling device and a method of using the device, including a cooling device with a coil and fin structure, wherein the coil and fin structure is used to provide a large area of ​​heat exchange surface to enhance the cooling effect; a heat network return water system; used to provide cooling water; a compressed air main pipe; and a cooling medium main pipe. The cooling device of the present invention adopts a coil and fin structure, and the medium in the cooling device does not directly contact the cylinder body, thereby ensuring that the cylinder surface is not damaged by blowing and that the insulation is not damaged by blowing. At the same time, the cooling is uniform. A closed cycle is adopted, and the temperature rises after the medium cools the cylinder body, and the high-temperature medium is recovered to the heat network water. At the same time, it is ensured that there is no on-site discharge, which can ensure the safety of personnel and extend the service life of the equipment. Compressed air and water are used as two media, and the dual modes can be switched for operation. When the temperature difference is small, compressed air cooling is used to increase the corresponding speed; when the temperature difference is large, water is used to increase the heat recovery amount.

Description

Technical Field

[0001] The invention relates to the technical field of cooling, and in particular to a dual-mode steam turbine cylinder cooling device and a use method thereof. Background Art

[0002] During the start-up and shutdown process of the turbine body, the temperature of the upper cylinder will generally be higher than that of the lower cylinder because of the heat rise in the turbine cylinder. If it is not controlled, the temperature difference between the upper and lower cylinders will easily occur. The excessive temperature difference between the upper and lower cylinders and the inner and outer walls may cause the cylinder to deform, causing the dynamic and static parts of the turbine to collide, inducing turbine vibration and even causing the bending of the main shaft, which poses a major safety hazard. In order to ensure that the temperature deviation of the upper and lower cylinders of the turbine is controlled within ±50℃ during the start-up and shutdown of the turbine, the existing solution is to design a compressed air pipeline, which is connected to the cylinder surface through valve control, and a cover is made to buckle on the cylinder, and the outside is covered with insulation, or the pipeline is directly laid on the cylinder, and the pipeline is opened to spray air for cooling, which directly blows cold air to the surface of the cylinder for cooling, and the cooled air is directly discharged to the local turbine cover.

[0003] The problem with the existing technology is that

[0004] 1. The cooling actuator pipe or closed air chamber is buried inside the insulation of the turbine cylinder. The cooling air is heated and discharged directly in the insulation, which is very easy to cause insulation blow damage. Insulation failure will cause the turbine cylinder insulation to overheat, waste heat and lose efficiency during operation. Blowing directly to the cylinder will also cause slight damage to the cylinder because it is direct blowing, and the cooling of the parts that are blown and those that are not blown is very uneven.

[0005] 2. The temperature of the compressed air used for cooling is very high after passing through the cylinder body. The heated hot air is discharged around the turbine, usually in the turbine body cover, which will cause the internal temperature of the cover to rise, which is not good for the service life of the main protection and monitoring points and cables in the cover. At the same time, there are safety hazards for personnel inspections in the cover.

[0006] 3. The heat of the heated air is wasted and cannot be recovered.

[0007] 4. The air’s ability to absorb heat is limited and sometimes cannot be adjusted properly. Summary of the invention

[0008] In view of the above-mentioned problems existing in the existing dual-mode steam turbine cylinder cooling device, the present invention is proposed.

[0009] Therefore, the purpose of the present invention is to provide a dual-mode steam turbine cylinder cooling device, which aims to provide a dual-mode steam turbine cylinder cooling device to achieve the cylinder surface is not damaged by blowing, to ensure that the heat preservation is not damaged by blowing. At the same time, the cooling is uniform, and the service life of the equipment is achieved, and the heat absorption capacity of the absorbed air is improved.

[0010] In order to solve the above technical problems, the present invention provides the following technical solutions: A dual-mode steam turbine cylinder cooling device includes a cooling device with a coil plus fin structure, wherein the coil plus fin structure is used to provide a large area of ​​heat exchange surface to enhance the cooling effect;

[0011] Heat network return water system; used to provide cooling water;

[0012] Compressed air main pipe; used to provide compressed air;

[0013] The cooling medium main pipe is used to connect to the high-pressure cylinder and medium-pressure cylinder cooling device branch pipes.

[0014] As a preferred solution of the dual-mode steam turbine cylinder cooling device of the present invention, the coil and fin structure is evenly arranged on the surface of the steam turbine cylinder and fixed by binding with an integral steel belt.

[0015] As a preferred solution of the dual-mode steam turbine cylinder cooling device of the present invention, the medium in the cooling device does not directly contact the cylinder.

[0016] As a preferred solution of the dual-mode turbine cylinder cooling device described in the present invention, temperature regulating valves are respectively arranged on the branch pipes of the high-pressure cylinder and the medium-pressure cylinder cooling devices; the temperature regulating valves are used to automatically track the temperature difference between the upper and lower cylinders of the turbine.

[0017] As a preferred solution of the dual-mode steam turbine cylinder cooling device described in the present invention, wherein: the heat network return water system leads out a cooling water and isolation valve, and the compressed air main pipe leads out a compressed air and isolation valve, which are respectively connected to the upper cylinder cooling system switching valve; the cooling water and isolation valve are used to control the output of cooling water; the compressed air and isolation valve are used to control the output of compressed air; the switching valve is used to select compressed air or water as the cooling medium; the switching valve only allows single-side operation, and does not allow parallel operation of both sides.

[0018] As a preferred solution of the dual-mode steam turbine cylinder cooling device of the present invention, remote pressure and remote temperature measuring points are installed on the cooling medium main pipe for monitoring cooling medium parameters.

[0019] To solve the above problems, the present invention also provides the following technical solutions: a method for using a dual-mode steam turbine cylinder cooling device, comprising the dual-mode steam turbine cylinder cooling device, and collecting the heated medium after cooling the cylinder to the main pipe switching valve; the switching valve is linked with the inlet switching valve, and switches at the same time, exhausting the incoming air and draining the incoming water; the heated medium is used in the heat network water supply system or the factory employee bathing water heat exchanger.

[0020] As a preferred scheme for the use of the dual-mode turbine cylinder cooling device described in the present invention, remote pressure and temperature measuring points are installed on the cooling medium main pipe; temperature regulating valves are respectively set on the high-pressure cylinder and medium-pressure cylinder cooling device branch pipes to achieve automatic start-up and track the temperature difference between the upper and lower cylinders of the turbine.

[0021] As a preferred scheme for the use of the dual-mode turbine cylinder cooling device of the present invention, wherein: A. according to the temperature difference between the upper and lower cylinders of the turbine, compressed air or water is selected as the cooling medium; B. the medium is switched by the upper cylinder cooling system switching valve.

[0022] As a preferred scheme for the use of the dual-mode turbine cylinder cooling device of the present invention, the finned coils are evenly arranged in an S shape on the upper cylinder surface; the coils are tied to the cylinder with an integral steel belt to avoid welding damage to the cylinder.

[0023] Beneficial effects of the present invention: The cooling device adopts a coil plus fin structure, and the medium in the cooling device does not directly contact the cylinder body, ensuring that the cylinder surface is not damaged by blowing and that the insulation is not damaged by blowing. At the same time, the cooling is uniform. A closed cycle is adopted, and the temperature rises after the medium cools the cylinder body, and the high-temperature medium is recovered to the hot network water. At the same time, it is ensured that there is no on-site discharge, which can ensure the safety of personnel and extend the service life of the equipment. Compressed air and water are used as two media, and dual modes can be switched for operation. When the temperature difference is small, compressed air cooling is used to increase the corresponding speed; when the temperature difference is large, water is used to increase the heat recovery amount. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0025] Figure 1 It is an overall schematic diagram of the present invention. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0029] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0030] Example 1

[0031] Reference Figure 1 , which is the first embodiment of the present invention, provides a dual-mode turbine cylinder cooling device and a method of use, the device includes a cooling device with a coil plus fin structure, the coil plus fin structure is used to provide a large area of ​​heat exchange surface to enhance the cooling effect; a heat network return water system; used to provide cooling water; a compressed air main pipe; used to provide compressed air; a cooling medium main pipe, used to connect to the high-pressure cylinder and medium-pressure cylinder cooling device branches.

[0032] Specifically, the coil and fin structure is evenly arranged on the surface of the turbine cylinder and fixed by binding with an integral steel belt, so that the medium in the cooling device does not directly contact the cylinder.

[0033] Furthermore, temperature regulating valves are respectively arranged on the branch pipes of the high-pressure cylinder and the medium-pressure cylinder cooling devices, and the temperature regulating valves are used to automatically track the temperature difference between the upper and lower cylinders of the steam turbine. A cooling water and an isolating valve are led out from the heat network return water system, and a compressed air and an isolating valve are led out from the compressed air main pipe, which are respectively connected to the upper cylinder cooling system switching valve, the cooling water and the isolating valve are used to control the output of cooling water; the compressed air and the isolating valve are used to control the output of compressed air; the switching valve is used to select compressed air or water as the cooling medium; the switching valve only allows single-side operation, and does not allow parallel operation of both sides.

[0034] Furthermore, remote pressure and temperature measuring points are installed on the cooling medium main pipe to monitor the cooling medium parameters.

[0035] Among them, the effect of the coil plus fin structure: providing uniform cooling effect, while protecting the cylinder body and insulation layer from damage. Function: as the main cooling component, it transfers heat through the flow of the medium to achieve cooling of the cylinder body.

[0036] The effect of cooling water isolation valve and compressed air isolation valve: Control the flow of cooling medium to ensure the safety and controllability of the system. Function: Cut off or open the flow of cooling medium when necessary to prevent accidents in the system during maintenance or emergency.

[0037] The effect of remote pressure and remote temperature measurement points: real-time monitoring of the pressure and temperature of the cooling medium to ensure the cooling effect and system safety. Function: provide real-time data of cooling medium parameters to facilitate monitoring and adjustment by operators.

[0038] The effect of the temperature regulating valve: automatically adjust the cooling medium flow according to the temperature difference between the upper and lower cylinders of the turbine to keep the cylinder temperature stable. Function: realize automatic control, reduce manual intervention, and improve the system's response speed and regulation accuracy.

[0039] The effect of the main pipe switching valve: to achieve rapid switching and discharge of cooling medium, improve the flexibility and efficiency of the system. Function: to quickly cut off or switch the medium flow when the cooling medium needs to be replaced or maintenance is required.

[0040] In summary, a cooling water and an isolation valve are led out from the heat network return water system, and a compressed air and an isolation valve are led out from the compressed air main pipe, and they are connected to the upper cylinder cooling system switching valve respectively. The switching valve can only be operated on one side, and cannot be operated in parallel on both sides. Remote pressure and temperature measuring points are installed on the cooling medium main pipe to facilitate monitoring of cooling medium parameters. The cooling medium main pipe is connected to the high-pressure cylinder and medium-pressure cylinder cooling device branch pipes respectively. Temperature regulating valves are set on the branch pipes respectively, which can be put into automatic operation to track the temperature difference between the upper and lower cylinders of the turbine. The finned coils on the cylinder body are evenly arranged in an S shape on the surface of the upper cylinder, fit with the cylinder body, and are tied to the cylinder with an integral steel belt without welding to damage the cylinder body.

[0041] After the cylinder is cooled, the heated medium is collected to the main pipe switching valve, which is linked with the inlet switching valve and switched at the same time, with the incoming air exhausting and the incoming water draining. The heated medium is used in the heat network water supply system or the factory employee bathing water heat exchanger.

[0042] Example 2

[0043] Reference Figure 1 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: the heated medium after cooling the cylinder body is collected to the main pipe switching valve; the switching valve is linked with the inlet switching valve and switches at the same time, the incoming air is exhausted and the incoming water is drained; the heated medium is used for the heat network water supply system or the factory employee bathing water heat exchanger. Remote pressure and remote temperature measuring points are installed on the cooling medium main pipe; temperature regulating valves are respectively set on the high-pressure cylinder and medium-pressure cylinder cooling device branches to realize automatic start-up and track the temperature difference between the upper and lower cylinders of the turbine.

[0044] Furthermore, according to the temperature difference between the upper and lower cylinders of the steam turbine, compressed air or water is selected as the cooling medium; the medium is switched through the upper cylinder cooling system switching valve, and the coil with fins is evenly arranged in an S shape on the surface of the upper cylinder; the coil is tied to the cylinder with an integral steel belt to avoid welding damage to the cylinder body.

[0045] When in use, the medium is introduced: one cooling water is led out from the heat network return water system, and an isolation valve is installed. One compressed air is led out from the compressed air main pipe, and an isolation valve is installed. These two media are respectively connected to the upper cylinder cooling system switching valve, which can only operate on one side, and does not allow the two sides to operate in parallel.

[0046] Monitoring and regulation: Install remote pressure and temperature measuring points on the cooling medium main pipe to monitor the parameters of the cooling medium. Connect the cooling medium main pipe to the cooling device branch pipes of the high-pressure cylinder and the medium-pressure cylinder respectively. Set the temperature regulating valve on the branch pipe, which can be put into automatic control to track the temperature difference between the upper and lower cylinders of the steam turbine.

[0047] Cooling process: The coils with fins on the cylinder body are evenly arranged in an S shape on the upper cylinder surface and fit closely with the cylinder body. They are tied to the cylinder with an integral steel belt to avoid welding damage to the cylinder body.

[0048] Depending on the temperature difference between the upper and lower cylinders of the turbine, choose to use compressed air or water as the cooling medium.

[0049] Medium recovery and switching: After cooling the cylinder, the heated medium is collected in the main pipe switching valve, which is linked with the inlet switching valve and switched at the same time, with the incoming air exhausting and the incoming water draining. The heated medium is used in the heat network water supply system or the factory employee bathing water heat exchanger.

[0050] Example 3

[0051] Reference Figure 1 , which is the third embodiment of the present invention, wherein: the coils with fins on the cylinder body are evenly arranged in an S shape on the upper cylinder surface.

[0052] Furthermore, for the layout of the coil, a spiral layout can be considered. The spiral coil layout can increase the contact area between the tube and the surrounding air, thereby improving the heat exchange efficiency. This layout helps to evenly distribute the fluid in the tube, reduce flow dead zones, and ensure that the fluid in the entire tube can participate in the heat exchange. This layout helps to evenly distribute the fluid in the tube, reduce flow dead zones, and ensure that the fluid in the entire tube can participate in the heat exchange. The spiral layout can be designed to make the fluid flow at a lower speed in the tube, thereby reducing pressure loss. This layout can better adapt to complex space constraints, especially in situations where the heat exchange area needs to be maximized in a limited space.

[0053] Furthermore, the shape, size and arrangement of the fins are changed to increase the contact area between the medium and the fins, thereby improving the heat exchange efficiency. Louvered or zigzag fins can be used. Louvered or zigzag fin designs can significantly increase the surface area of ​​the fins, thereby improving the heat exchange efficiency. At the same time, this fin design helps to improve the distribution of airflow on the fin surface, reduce the short circuit of airflow in certain areas, and ensure that more airflow can contact the fin surface. Zigzag fins can increase the residence time of airflow on the fin surface, thereby improving the heat dissipation effect. The design of louvered fins can reduce the accumulation of dust and dirt because they can be cleaned more easily. Zigzag fins can provide better structural strength because they can better withstand thermal expansion and mechanical stress.

[0054] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0055] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0056] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A dual-mode steam turbine cylinder cooling device, characterized in that: include, A cooling device with a coil-and-fin structure, which is used to provide a large heat exchange surface to enhance the cooling effect; Heat network return water system, used to provide cooling water; Compressed air main pipe, used to provide compressed air; The cooling medium main pipe is used to connect to the high-pressure cylinder and medium-pressure cylinder cooling device branch pipes.

2. The dual-mode steam turbine cylinder cooling device according to claim 1, characterized in that: The coil and fin structure is evenly arranged on the surface of the turbine cylinder and fixed by integral steel belt binding.

3. The dual-mode steam turbine cylinder cooling device according to claim 2, characterized in that: The medium in the cooling device does not come into direct contact with the cylinder body.

4. The dual-mode steam turbine cylinder cooling device according to claim 3, characterized in that: Temperature regulating valves are respectively provided on the branch pipes of the high-pressure cylinder and the medium-pressure cylinder cooling device; The temperature regulating valve is used to automatically track the temperature difference between the upper and lower cylinders of the steam turbine.

5. The dual-mode steam turbine cylinder cooling device according to claim 4, characterized in that: The heat network return water system leads out a cooling water and an isolation valve, and the compressed air main pipe leads out a compressed air and an isolation valve, which are respectively connected to the upper cylinder cooling system switching valve; The cooling water isolation valve is used to control the output of cooling water; The compressed air isolation valve is used to control the output of compressed air; The switching valve is used to select compressed air or water as the cooling medium; the switching valve only allows single-side operation and does not allow parallel operation of both sides.

6. The dual-mode steam turbine cylinder cooling device according to claim 5, characterized in that: The cooling medium main pipe is equipped with remote pressure and remote temperature measuring points for monitoring cooling medium parameters.

7. A method for using a dual-mode steam turbine cylinder cooling device, characterized in that: The dual-mode steam turbine cylinder cooling device comprises any one of claims 1 to 6, and The heated medium after cooling the cylinder body is collected to the main pipe switching valve; The switching valve is linked with the inlet switching valve and switches simultaneously, exhausting air with incoming air and draining water with incoming water; The heated medium is used in the heat network water supply system or in the factory employee bath water heat exchanger.

8. The method for using the dual-mode steam turbine cylinder cooling device according to claim 7, characterized in that: Install remote pressure and temperature measuring points on the cooling medium main pipe; Temperature regulating valves are respectively provided on the branch pipes of the high-pressure cylinder and the intermediate-pressure cylinder cooling devices to realize automatic start-up and track the temperature difference between the upper and lower cylinders of the turbine.

9. The method for using the dual-mode steam turbine cylinder cooling device according to claim 8, characterized in that: According to the temperature difference between the upper and lower cylinders of the steam turbine, choose to use compressed air or water as the cooling medium; The medium is switched by the upper cylinder cooling system switching valve.

10. The method for using the dual-mode steam turbine cylinder cooling device according to claim 9, characterized in that: Arrange the finned coils in an S-shape evenly on the surface of the upper cylinder; Use an integral steel belt to tie the coil to the cylinder to avoid welding damage to the cylinder body.

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