Steam supply structure and steam supply equipment for thermal power plant

Abstract

The invention discloses a steam supply structure and steam supply equipment for a thermal power plant. The steam supply structure comprises a main steam pipeline; the auxiliary steam pipeline is communicated with the main steam pipeline through a self-cleaning drain valve device; the self-cleaning drain valve device comprises a valve shell, and a centrifugal assembly is arranged in the valve shell; the collecting assembly is arranged at the bottom of the valve shell and located below the centrifugal assembly. One end of the unblocking assembly is connected to the centrifugal assembly, and the other end is in contact with the collecting assembly; under the action of steam, the centrifugal assembly rotates to throw impurities in the steam into the collecting assembly, and meanwhile, the surface of the collecting assembly is unblocked through the unblocking assembly. Under the action of steam, the steam trap can rotate to throw impurities in the steam to the collecting assembly, so that the impurities are prevented from being deposited at key parts such as the valve seat, the valve clack or the valve plate, the problem that a traditional steam trap is easy to block is effectively solved, and the normal drainage function of the steam trap is guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of steam supply technology for thermal power plants, and specifically relates to a steam supply structure and equipment for thermal power plants. Background Technology

[0002] Currently, in the steam supply pipeline system of thermal power plants, steam traps or pressure regulating valves are used for drainage between the main steam pipeline and the auxiliary steam pipeline. Since both types of valves lack an effective impurity interception structure, they cannot effectively filter impurities carried in the steam during the steam transmission process. This can easily cause rust to appear on the inner wall of the pipelines of downstream equipment, leading to channel blockage and a sharp decline in drainage capacity, or even complete failure. This not only damages the pipelines and equipment, but also reduces the quality of steam, affects the thermal efficiency of the unit, and increases energy consumption and operating costs.

[0003] Furthermore, in the field of steam pressure regulation, the regulating valves currently used between the main steam pipeline and the high-pressure cylinder of the steam turbine are either electric or pneumatic. Electric regulating valves use a DCS system to send an electrical signal to drive a motor, which in turn moves the valve core via a gear transmission mechanism, achieving precise control of steam pressure. Pneumatic regulating valves rely on a stable compressed air source; the air pressure drives the cylinder piston, thereby controlling the valve core position and regulating steam flow and pressure. Although both types of regulating valves can meet pressure regulation requirements under normal operating conditions, their reliance on a single power source and their vulnerability become apparent in extreme situations. During the operation of a thermal power plant, in the event of a plant-wide power outage or a burst gas pipeline, the electric regulating valve will lose power due to the power interruption, the motor will not operate, and the valve core will remain stationary, leading to uncontrolled steam pressure. The pneumatic regulating valve will also fail to operate due to insufficient or lost air pressure, similarly failing to maintain stable system pressure. Summary of the Invention

[0004] The purpose of this invention is to provide a steam supply structure and equipment for thermal power plants. On the one hand, it addresses the technical defects in the prior art where steam traps or pressure regulating valves cannot effectively filter impurities carried in steam, easily causing rust on the inner walls of downstream equipment pipelines, leading to channel blockage, a sharp decrease in drainage capacity, or even complete failure. On the other hand, it addresses the technical defects in the steam pipeline pressure regulation process where the regulating valves used are constrained by external power and cannot provide reliable regulation functions.

[0005] To achieve the above objectives, the present invention employs the following technical solution: Firstly, a steam supply structure for a thermal power plant is provided, including: Main steam pipeline; An auxiliary steam pipe is connected to the main steam pipe via a self-cleaning steam trap. The self-cleaning drain valve device includes: Valve housing, which contains a centrifugal assembly; A collection component is disposed at the bottom of the valve housing and located below the centrifugation component; The unblocking component has one end connected to the centrifugal component and the other end in contact with the collection component; Under the action of steam, the centrifugal component rotates and throws impurities in the steam into the collection component, while the unclogging component cleans the surface of the collection component.

[0006] Furthermore, one end of the valve housing is connected to the main steam pipe, and the other end is connected to the auxiliary steam pipe; The valve housing has a flow guide groove at one end near the auxiliary steam pipe, and the end of the flow guide groove contacts the top of the collection assembly. The centrifugal assembly is located inside the valve housing at one end near the main steam pipe and above the guide groove; The unblocking component and the collecting component are axially aligned and axially perpendicular to the valve body.

[0007] Furthermore, the centrifugation assembly includes: The rotating shaft is rotatably connected to the end face of the valve body and coincides with the axial direction of the valve body; Helical blades are wound around the outside of the rotating shaft; The unblocking component includes: At least one turntable is disposed on the rotating shaft and located on one side of the helical blade; A connecting rod is rotatably connected to the outside of the turntable, and a cam is rotatably connected to its end; The collection component includes: A collection cylinder is located on the outside of the valve body; Support plates are symmetrically arranged on opposite sides inside the collection cylinder. Each of the two support plates is provided with an elastic unit. The two elastic units are connected by a filter screen, which cooperates with a cam.

[0008] Furthermore, it also includes: Steam turbine high-pressure cylinder; The pressure self-regulating control device is connected at one end to the main steam pipeline and at the other end to the high-pressure cylinder of the steam turbine. The pressure self-regulating control device and the self-cleaning drain valve device are axially perpendicular. When the pressure of the steam in the main steam pipeline changes, the pressure self-regulating control device adjusts the flow area of ​​the steam entering the high-pressure cylinder of the steam turbine.

[0009] Furthermore, the pressure self-regulating control device includes: The connecting pipe is installed between the main steam pipeline and the high-pressure cylinder of the steam turbine. The corrugated pipe has one end fixed to the end of the main steam pipe near the connecting pipe, and the other end slidably disposed on the outside of the connecting pipe. A valve stem is fitted onto the inner wall of the bellows, and a connecting rod is rotatably connected to its end. A guide groove is formed on the inner wall of the connecting pipe near the high-pressure cylinder of the steam turbine. A slider is slidably connected in the guide groove. A toothed plate is provided at the bottom of the slider. The toothed plate is located above the valve stem. The gear is rotatably connected to the wall of the connecting pipe via a rotating shaft and meshes with a toothed plate; the end of the connecting rod is rotatably connected to the rotating shaft. The fixing bracket is installed at the end of the connecting pipe that connects to the high-pressure cylinder of the steam turbine. An eccentric ball plug is slidably connected to the fixed frame and is located in the communication hole between the connecting pipe and the high-pressure cylinder of the steam turbine; The push rod has one end rotatably connected to the surface of the eccentric ball plug, and the other end rotatably connected to the outside of the gear; In the bellows extension and retraction state, the valve stem drives the connecting rod to rotate the gear, which in turn drives the push rod to push the eccentric ball plug to displacement.

[0010] Furthermore, the push rod is rotatably connected to the outer edge of the gear.

[0011] Furthermore, the eccentric ball plug has a structure that is narrower at the top and wider at the bottom; The eccentric ball plug has vertical rods on opposite sides, and the two vertical rods are slidably connected to the fixed frame.

[0012] Furthermore, it also includes: The reheat steam pipeline and the connecting pipeline are provided. One end of the reheat steam pipeline is connected to the high-pressure cylinder of the steam turbine, and the other end is connected to the intermediate and low-pressure cylinder of the steam turbine through the boiler reheater. The intermediate and low-pressure cylinder of the steam turbine is connected to the connecting pipeline. The installation components are located on the outside of the main steam pipe, reheat steam pipe, and connecting pipes; An insulation layer is disposed on the inner wall of the mounting component.

[0013] Furthermore, the mounting components include: The No. 1 arc-shaped plate has a rotating rod rotatably connected to one end of its inner cavity; A magnet block is disposed at the other end of the inner cavity of the first arc-shaped plate; The second arc-shaped plate is connected to the rotating rod at one end and has a metal plate at the other end, which cooperates with the magnet block.

[0014] Secondly, a steam supply device is provided, wherein the steam supply device is equipped with the steam supply structure for thermal power plants as described above.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The self-cleaning steam trap is equipped with a centrifugal component, which can rotate under the action of steam to throw impurities in the steam towards the collection component, avoiding the deposition of impurities in key parts such as valve seat, valve disc or valve plate, effectively solving the problem of easy clogging of traditional steam traps and ensuring the normal drainage function of the steam trap.

[0016] 2. After steam enters the valve body from the main steam pipe, it first passes through the centrifugal assembly for preliminary impurity separation. Under the action of centrifugal force, the impurities are thrown out, and the end of the guide channel contacts the top of the collection assembly, ensuring that the impurities separated by the centrifugal assembly can fall into the collection assembly accurately. This avoids the impurities from drifting around in the valve body or mixing back into the steam, thus improving the impurity collection efficiency and further enhancing the steam trap's ability to intercept and process impurities.

[0017] 3. The shaft and valve housing are axially aligned and rotatably connected, ensuring that the shaft can rotate stably within the valve housing, providing a reliable rotational foundation for the helical blades; the turntable rotates synchronously with the shaft, transmitting the rotational power of the shaft to the cam, making full use of the existing rotational power of the centrifugal assembly, eliminating the need for an additional power source, simplifying the structure of the device, and reducing energy consumption and cost.

[0018] 4. When the pressure of steam in the main steam pipeline changes, the pressure self-regulating control device can quickly adjust the flow area of ​​steam entering the high-pressure cylinder of the steam turbine. It can adapt to the fluctuation of steam pressure in a timely manner and ensure that the steam pressure entering the high-pressure cylinder of the steam turbine is always maintained within a suitable range, providing a reliable guarantee for the stable operation of the steam turbine.

[0019] 5. When the steam pressure in the main steam pipeline changes, the bellows expands and contracts, causing the valve stem to move. The valve stem, through the connecting rod, causes the gear to rotate. The rotation of the gear, in turn, drives the push rod. The push rod pushes the eccentric ball plug to move on the fixed frame, changing the flow area of ​​the connecting pipe and the high-pressure cylinder of the steam turbine. This allows for precise regulation of the steam flow rate, meeting the steam parameter requirements of the steam turbine under different operating conditions.

[0020] 6. The push rod is connected to the outer edge of the gear. When the gear rotates, the push rod can obtain a larger displacement, which allows the eccentric ball plug to have a more obvious displacement in the connecting pipe and the high-pressure cylinder of the steam turbine, thereby changing the steam flow area more accurately and quickly.

[0021] 7. Due to the different widths at the top and bottom, the change in flow area is more obvious and can be precisely controlled.

[0022] 8. The insulation layer has good thermal insulation performance, which can effectively prevent heat transfer, reduce heat loss of steam during transportation, maintain stable steam temperature and pressure, and improve steam utilization efficiency.

[0023] 9. The final fixation is achieved by using the cooperation between the magnet and the metal plate. After the second arc plate is rotated to the appropriate position, simply bring the metal plate at the other end of the second arc plate close to the magnet at the other end of the inner cavity of the first arc plate. The attraction of the magnet will make the two fit tightly together, completing the installation. There is no need for complicated operations such as tightening bolts, which further simplifies the installation process. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a three-dimensional schematic diagram of the steam supply structure of a thermal power plant provided by the present invention; Figure 2 This is a top view of the steam supply structure of a thermal power plant provided by the present invention; Figure 3 A schematic diagram of a self-cleaning hydrophobic device in a thermal power plant steam supply structure provided by the present invention; Figure 4 A schematic diagram of a pressure self-regulating mechanical control device in the steam supply structure of a thermal power plant provided by the present invention; Figure 5 This is a schematic diagram showing the installation components and insulation layer in the steam supply structure of a thermal power plant provided by the present invention. The components include: 1. Boiler header; 2. Main steam pipeline; 3. Pressure self-regulating control device; 301. Bellows; 302. Connecting pipe; 303. Valve stem; 304. Gear plate; 305. Gear; 306. Connecting rod; 307. Fixing bracket; 308. Eccentric ball plug; 309. Push rod; 4. High-pressure cylinder of steam turbine; 5. Reheat steam pipeline; 6. Boiler reheater; 7. Medium and low-pressure cylinder of steam turbine; 8. Connecting pipeline; 9. Condenser; 10. Self-cleaning steam trap device. ; 101. Valve housing; 102. Rotating shaft; 103. Spiral blade; 104. Turntable; 105. Collection cylinder; 106. Metal spring; 107. Filter screen; 108. Connecting rod; 109. Cam; 11. Auxiliary steam pipe; 12. Deaerator; 13. Heating device; 14. Connecting pipe; 15. Insulation layer; 16. Mounting assembly; 161. Arc plate No. 1; 162. Arc plate No. 2; 163. Rotating rod; 164. Magnet block; 165. Metal plate. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention 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 the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0032] To address the technical deficiencies mentioned in the background section, this embodiment provides a steam supply structure and equipment for a thermal power plant. The invention will be further described in detail below with reference to the accompanying drawings: In a first aspect, embodiments of the present invention provide a steam supply structure for a thermal power plant, such as... Figures 1-5 As shown, the steam supply structure includes a boiler header 1, a main steam pipe 2, a pressure self-regulating control device 3, a high-pressure cylinder of a steam turbine 4, a reheat steam pipe 5, a boiler reheater 6, a medium and low-pressure cylinder of a steam turbine 7, a connecting pipe 8, and a condenser 9 connected in sequence. An auxiliary steam pipe 11 is connected to the side of the main steam pipe 2 that is axially perpendicular to the main steam pipe 2 through a self-cleaning drain valve device 10. A deaerator 12 is installed at the top of the auxiliary steam pipe 11, and a heating device 13 is installed at the end of the auxiliary steam pipe 11. The heating device 13 is connected to the condenser 9 through a connecting pipe 14.

[0033] In the above structure, the boiler header 1 serves as the steam source, generating a large amount of high-temperature, high-pressure steam by burning fuel and heating water. This high-temperature, high-pressure steam is transported through the main steam pipeline 2 (the main steam valve and electric isolation valve installed on the main steam pipeline 2 can control the steam flow and shut-off) to the high-pressure cylinder 4 of the turbine. After the high-pressure cylinder of the turbine performs work, the pressure and temperature of the high-temperature, high-pressure steam decrease, and it is output through the exhaust port of the high-pressure cylinder 4 into the reheat steam pipeline 5. The reheat steam pipeline 5 then transports the reduced pressure and temperature steam to the boiler reheater 6 for secondary heating. The heated steam then enters the low-pressure cylinder 7 of the turbine through a section of pipe on the side of the boiler reheater 6 to continue expanding and performing work, further converting the thermal energy of the steam into mechanical energy and improving energy utilization efficiency. The exhaust steam after performing work enters the condenser 9 through the connecting pipeline 8, is cooled and condensed into water, and returns to the boiler to participate in the cycle.

[0034] The auxiliary steam pipeline 11, which branches off from the main steam pipeline 2, provides auxiliary steam for equipment such as the deaerator 12. After entering the deaerator 12, the auxiliary steam heats the feedwater through the heating device 13 to reduce the oxygen content in the water and prevent corrosion of the pipeline and equipment. The deaerated water returns to the system through the connecting pipe 14 and merges with the condensate produced by the condenser 9. After treatment, it is used as boiler feedwater to complete the entire steam supply cycle.

[0035] During steam transportation, the steam traps or pressure regulating valves used between the main steam pipeline 2 and the auxiliary steam pipeline 11 lack effective impurity interception structures, making it impossible to effectively filter impurities carried in the steam. This can easily cause rust to appear on the inner walls of subsequent equipment pipelines, leading to channel blockage and a sharp decrease in drainage capacity, or even complete failure. To solve this problem, this solution installs a self-cleaning steam trap device 10 between the main steam pipeline 2 and the auxiliary steam pipeline 11. By utilizing the self-cleaning function of the self-cleaning steam trap device 10, impurities in the steam can be effectively intercepted, filtered, and collected during the steam transportation process from the main steam pipeline 2 to the auxiliary steam pipeline 11, eliminating the problem of channel blockage and maintaining drainage capacity and steam quality.

[0036] Furthermore, such as Figure 3 As shown, the self-cleaning steam trap device 10 includes a valve housing 101, which is a tubular structure. Inside the valve housing 101 are a centrifugal assembly, a collection assembly, and a cleaning assembly. The collection assembly is located at the bottom of the valve housing 101 and below the centrifugal assembly, which can collect impurities to the greatest extent. The cleaning assembly is rotatably connected to the centrifugal assembly at one end and contacts the surface of the collection assembly at the other end. Under the action of steam, the centrifugal assembly rotates and throws impurities in the steam into the collection assembly, while the cleaning assembly cleans the surface of the collection assembly.

[0037] In practice, one end of the valve housing 101 is connected to the main steam pipe 2, and the other end is connected to the auxiliary steam pipe 11, thereby connecting the main steam pipe 2 and the auxiliary steam pipe 11 so that steam can be transported smoothly. A guide groove is provided on the inner wall of the valve housing 101 near the auxiliary steam pipe 11. The guide groove has an inclined structure, and the inclined end of the guide groove contacts the top of the collection component, so that the impurities centrifuged in the steam can flow along the guide groove into the collection component. The centrifugal component is set in the valve housing 101 near the main steam pipe 2 and is located above the guide groove. The unblocking component and the collection component are axially aligned and axially perpendicular to the valve housing 101.

[0038] After steam enters the valve body 101 from the main steam pipe 2, it first undergoes preliminary impurity separation through the centrifugal assembly. Under the action of centrifugal force, the impurities are thrown out, and then the steam flows more smoothly into the collection assembly through the guide channel. The design of the guide channel guides and rectifies the impurities, reduces the turbulence of the steam flow, and is conducive to the stable transmission of subsequent steam. It also provides good flow field conditions for the impurities to fall smoothly into the collection assembly. The unique design of the anti-clogging component axially aligning with the collection assembly and axially perpendicular to the valve body 101 allows the anti-clogging component to accurately clean the surface of the collection assembly. During operation, as impurities continuously fall into the collection assembly, some impurities may adhere to the surface of the collection assembly, affecting its collection function. The anti-clogging component can rotate under the drive of the centrifugal assembly and contact the surface of the collection assembly. Through vibration, it can thoroughly and effectively clean the surface of the collection assembly, preventing impurities from clogging the collection assembly and ensuring that the collection assembly always maintains a good working condition.

[0039] Through the coordinated operation of the aforementioned components, the problem of easy clogging of traditional steam traps is effectively solved, ensuring that the self-cleaning steam trap device 10 can continuously and stably achieve the function of draining and blocking steam, preventing the accumulation of condensate in the pipeline, avoiding water hammer, reducing damage to pipelines and equipment, and ensuring the safe operation of the steam supply pipeline system of thermal power plants. In addition, since impurities are effectively intercepted and treated, the impurity content in the steam is reduced, improving steam quality and reducing equipment failures and efficiency declines caused by poor steam quality. This improves the thermal efficiency of the unit, reduces energy consumption, and brings better economic and environmental benefits to thermal power plants.

[0040] Furthermore, the centrifugal assembly includes a rotating shaft 102, which is rotatably connected to the end face of the valve housing 101 near the main steam pipe 2 and is axially aligned with the valve housing 101. The spiral blades 103 are wound around the outside of the rotating shaft 102. The rotating shaft 102 can rotate stably inside the valve housing 101, providing a reliable rotation basis for the spiral blades 103. When steam enters the valve housing 101, the flow impact force of the steam drives the rotating shaft 102 to rotate, causing the entire centrifugal assembly to start working.

[0041] The unblocking component includes at least one turntable 104, such as Figure 3 As shown, in order to improve the unblocking efficiency, a turntable 104 is provided at both ends of the rotating shaft 102. The two turntables 104 are located at both ends of the spiral blade 103. A connecting rod 108 is rotatably connected to the side of the two turntables 104 near the spiral blade 103. A cam 109 is rotatably connected to the bottom of the two connecting rods 108. When the rotating shaft 102 rotates, the turntables 104 also rotate synchronously and transmit the rotational power of the rotating shaft 102 to the connecting rods 108 and the cams 109.

[0042] The collection assembly includes a collection cylinder 105. A threaded hole is provided at the bottom of the valve body 101, and the collection cylinder 105 is screwed into the threaded hole. Support plates are installed on opposite sides inside the collection cylinder 105. The two support plates are axially perpendicular to the collection cylinder 105. Each support plate is provided with an elastic unit, and the two elastic units are connected by a filter screen 107. The filter screen 107 cooperates with a cam 109. The support plates provide a stable support structure for the elastic units and the filter screen 107, ensuring that the filter screen 107 can maintain a relatively stable position and shape when squeezed by the cam 109 and impacted by steam, without excessive deformation or damage, thereby ensuring the normal operation and unclogging effect of the filter screen 107. The presence of the elastic units gives the filter screen 107 a certain elastic buffering capacity. When the cam 109 presses the filter screen 107, the elastic unit can absorb some energy, reduce the rigid impact on the filter screen 107, and extend the service life of the filter screen 107. At the same time, the elastic restoring force of the elastic unit can make the filter screen 107 quickly return to its original position after the cam 109 is released, ensuring the matching accuracy between the filter screen 107 and the cam 109 and improving the unclogging effect. In one embodiment, the elastic unit is a metal spring 106; in another embodiment, the elastic unit is a rubber spring.

[0043] When impurities in the steam are thrown towards the inner wall of the valve body 101, some impurities are directly filtered through the filter screen 107 and collected in the collection cylinder 105; the other part of the impurities are thrown to the guide groove, and then flow to the surface of the filter screen 107 through the guide groove, and fall into the collection cylinder 105 after being filtered. Since the cam 109 is in contact with the surface of the filter screen 107 by the action of the rotating shaft 102 and causes the surface of the filter screen 107 to vibrate, there will be no problem of impurities clogging the filter screen 107. After the steam supply operation is completed, the collection cylinder 105 can be removed from the bottom of the valve body 101 for normal use in the future.

[0044] To address the technical deficiency of regulating valves being constrained by external power and unable to provide reliable regulation, a pressure self-regulating control device 3 is installed between the main steam pipeline 2 and the high-pressure cylinder 4 of the turbine. The pressure self-regulating control device 3 is axially perpendicular to the self-cleaning drain valve device 10. When the steam pressure in the main steam pipeline 2 changes, the pressure self-regulating control device 3 automatically adjusts the flow area of ​​steam entering the high-pressure cylinder 4 of the turbine, ensuring that the steam pressure entering the high-pressure cylinder 4 is always maintained within a suitable range, providing a reliable guarantee for the stable operation of the turbine. For example, when the load of a thermal power plant suddenly increases or decreases, the main steam pressure will change accordingly. The pressure self-regulating control device can quickly adjust, avoiding shocks to the turbine caused by pressure instability.

[0045] During implementation, such as Figure 4As shown, the pressure self-regulating control device 3 includes a connecting pipe 302, which is located between the main steam pipe 2 and the turbine high-pressure cylinder 4. A bellows 301 is fixed at one end of the connecting pipe 302 near the main steam pipe 2. The end of the bellows 301 is slidably disposed on the outside of the connecting pipe 302. A valve stem 303 is provided on the inner wall of the bellows 301, and a connecting rod 306 is rotatably connected to the end of the valve stem 303. When the steam pressure changes, the bellows 301 can slide along the end of the connecting pipe 302 near the turbine high-pressure cylinder 4 and drive the valve stem 303 to achieve displacement.

[0046] A guide groove is formed on the inner wall of the connecting pipe 302 near the high-pressure cylinder 4 of the turbine. A slider is slidably connected in the guide groove, and a toothed plate 304 is provided at the bottom of the slider. The toothed plate 304 is located above the valve stem 303. A gear 305 is rotatably connected to the wall of the connecting pipe 302 via a rotating shaft (gear shaft) and meshes with the toothed plate 304. The end of the connecting rod 306 is rotatably connected to the rotating shaft. A fixed frame 307 is set at the end of the connecting pipe 302 that communicates with the high-pressure cylinder 4 of the turbine. An eccentric ball plug 308 is slidably connected to the fixed frame 307 and is located at the junction of the connecting pipe 302 and the high-pressure cylinder 4 of the turbine. In the 4-connecting hole; one end of the push rod 309 is rotatably connected to the surface of the eccentric ball plug 308, and the other end is rotatably connected to the outside of the gear 305; wherein, when the steam pressure in the main steam pipe 2 changes, the bellows 301 will rapidly expand and contract. In the state of expansion and contraction of the bellows 301, the valve stem 303 can drive the connecting rod 306 to drive the gear 305 to rotate, so that the gear 305 drives the push rod 309 to push the eccentric ball plug 308 to this displacement in the connecting hole, thereby realizing the fine adjustment of the steam flow rate and meeting the requirements of the high-pressure cylinder 4 of the steam turbine for steam parameters under different working conditions.

[0047] Secondly, the guide groove provides precise guidance for the movement of the slider, ensuring that the slider can only slide in the specified direction, thus preventing the slider from deviating or getting stuck during movement. At the same time, this guiding design also limits the range of motion of the toothed plate 304, thereby limiting the rotation angle of the gear 305 and the displacement range of the eccentric ball plug 308, preventing damage to the device or adjustment failure due to excessive movement of components, and ensuring the safe operation of the device.

[0048] Because the entire pressure self-regulating mechanical control device 3 adopts a mechanical transmission structure, the connection between each component is reasonable and firm, which not only ensures the relative movement flexibility between components, but also can withstand a certain force and torque, ensuring that there will be no loosening or damage during long-term operation, thus improving the reliability and stability of the device.

[0049] In practice, the push rod 309 is rotatably connected to the outer edge of the gear 305. According to the principle of circular motion, during the rotation of the gear 305, the linear velocity at the edge of the gear 305 is greater than that near the center, and the displacement change is greater. Since the push rod 309 is connected to the outer edge of the gear 305, when the gear 305 rotates, the push rod 309 can obtain a larger displacement. After transmitting this displacement to the eccentric ball plug 308, the eccentric ball plug 308 can have a more significant displacement in the communication hole between the connecting pipe 302 and the turbine high-pressure cylinder 4. This allows for a more precise and rapid change in the steam flow area, enabling a more sensitive response to changes in steam pressure within the main steam pipe 2, ensuring that the steam pressure entering the turbine high-pressure cylinder 4 can be quickly stabilized within a suitable range.

[0050] Since a tiny change in the rotation angle of the edge of gear 305 can cause a relatively large displacement change in push rod 309, the pressure self-regulating control device 3 can make more precise adjustments to the steam pressure. Even if there are only tiny fluctuations in the steam pressure in the main steam pipeline 2, push rod 309 can drive eccentric ball plug 308 to make corresponding tiny displacement adjustments, thereby accurately controlling the steam flow rate and meeting the strict requirements of the high-pressure cylinder 4 of the steam turbine for steam parameters under different operating conditions, thus improving the operating efficiency and stability of the steam turbine.

[0051] Furthermore, the eccentric ball plug 308 has a structure that is narrower at the top and wider at the bottom. Vertical rods are provided on opposite sides of the eccentric ball plug 308, and the two vertical rods are slidably connected to the fixed frame 307. Under the action of the push rod 309, the eccentric ball plug 308 can only move in a straight line along the preset track of the fixed frame 307, avoiding deviation or shaking caused by steam pressure fluctuations or other external forces. This ensures that the eccentric ball plug 308 can accurately adjust the flow area, improving the reliability and adjustment accuracy of the device. When the eccentric ball plug 308 moves in the fixed frame 307, it can change the steam flow area more precisely. When the eccentric ball plug 308 moves forward or backward a small distance, the change in flow area will be more obvious and can be precisely controlled due to the difference in width.

[0052] In this design, one end of the reheat steam pipe 5 is connected to the high-pressure cylinder 4 of the steam turbine, and the other end is connected to the intermediate-low-pressure cylinder 7 of the steam turbine via the boiler reheater 6. The intermediate-low-pressure cylinder 7 of the steam turbine is connected to the connecting pipe 8. An installation assembly 16 is installed on the outside of the main steam pipe 2, the reheat steam pipe 5, and the connecting pipe 8. The inner wall of the installation assembly 16 is provided with an insulation layer 15. The insulation layer 15 is installed on the inner wall of the installation assembly 16 and tightly wraps around the outside of the pipe. When steam flows in the pipe, it will lose heat to the surrounding environment, resulting in a drop in steam temperature and an increase in energy loss. The insulation layer 15 has good heat insulation performance, which can effectively prevent heat transfer, reduce heat loss of steam during transportation, maintain stable steam temperature and pressure, and improve steam utilization efficiency. At the same time, the insulation layer 15 can also reduce the temperature of the outer surface of the pipe, reduce the thermal impact on the surrounding environment, and improve the working environment.

[0053] During steam transportation, the stable support of the mounting component 16 and the protective function of the insulation layer 15 help reduce the stress on the pipeline caused by thermal expansion and contraction, vibration, etc., and reduce the risk of pipeline rupture. In addition, the insulation layer 15 can also prevent condensation on the pipeline surface due to low temperature, avoid pipeline corrosion, and further improve the safety and reliability of the pipeline.

[0054] In implementation, the installation component 16 includes a first arc-shaped plate 161 and a second arc-shaped plate 162, such as... Figure 5 As shown, the first arc-shaped plate 161 and the second arc-shaped plate 162 have the same structure. The first arc-shaped plate 161 is a hollow structure, with a rotating rod 163 rotatably connected to one end of the hollow cavity, and a magnet 164 installed at the other end. One end of the second arc-shaped plate 162 is connected to the rotating rod 163, and the other end is fitted with a metal plate 165 that matches the magnet 164. Compared with the traditional installation method that requires multiple bolts and nuts for fastening, this installation assembly 16 uses the cooperation between the magnet 164 and the metal plate 165 to achieve final fixation, eliminating the need for complicated bolt tightening operations and further simplifying the installation process.

[0055] When the magnet 164 engages with the metal plate 165, it generates a sufficiently large clamping force to firmly fix the mounting assembly 16 to the outside of the pipeline. This effectively resists external forces generated by factors such as changes in steam pressure, temperature fluctuations, and vibrations during pipeline operation, ensuring that the mounting assembly 16 will not loosen or fall off, thus providing stable support and protection for the pipeline.

[0056] When maintenance or repair of the pipeline is required, simply overcome the magnetic force between the magnet 164 and the metal plate 165, pull the second arc plate 162 outward to separate the metal plate 165 from the magnet 164, and the mounting assembly 16 can be easily removed from the pipeline.

[0057] Secondly, this embodiment provides a steam supply device, on which the steam supply device is equipped with the steam supply structure of a thermal power plant as described above.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit its scope of protection. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that after reading the present invention, they can still make various changes, modifications or equivalent substitutions to the specific implementation of the invention, but these changes, modifications or equivalent substitutions are all within the scope of protection of the pending claims of the invention.

Claims

1. A steam supply structure for a thermal power plant, characterized in that, include: Main steam pipeline; An auxiliary steam pipe is connected to the main steam pipe via a self-cleaning steam trap. The self-cleaning drain valve device includes: Valve housing, which contains a centrifugal assembly; A collection component is disposed at the bottom of the valve housing and located below the centrifugation component; The unblocking component has one end connected to the centrifugal component and the other end in contact with the collection component; Under the action of steam, the centrifugal component rotates and throws impurities in the steam into the collection component, while the unclogging component cleans the surface of the collection component.

2. The steam supply structure for a thermal power plant according to claim 1, characterized in that, One end of the valve body is connected to the main steam pipe, and the other end is connected to the auxiliary steam pipe; The valve housing has a flow guide groove at one end near the auxiliary steam pipe, and the end of the flow guide groove contacts the top of the collection assembly. The centrifugal assembly is located inside the valve housing at one end near the main steam pipe and above the guide groove; The unblocking component and the collecting component are axially aligned and axially perpendicular to the valve body.

3. The steam supply structure for a thermal power plant according to claim 2, characterized in that, The centrifugation assembly includes: The rotating shaft is rotatably connected to the end face of the valve body and coincides with the axial direction of the valve body; Helical blades are wound around the outside of the rotating shaft; The unblocking component includes: At least one turntable is disposed on the rotating shaft and located on one side of the helical blade; A connecting rod is rotatably connected to the outside of the turntable, and a cam is rotatably connected to its end; The collection component includes: A collection cylinder is located on the outside of the valve body; Support plates are symmetrically arranged on opposite sides inside the collection cylinder. Each of the two support plates is provided with an elastic unit. The two elastic units are connected by a filter screen, which cooperates with a cam.

4. The steam supply structure for a thermal power plant according to claim 1, characterized in that, Also includes: Steam turbine high-pressure cylinder; The pressure self-regulating control device is connected at one end to the main steam pipeline and at the other end to the high-pressure cylinder of the steam turbine. The pressure self-regulating control device and the self-cleaning drain valve device are axially perpendicular. When the pressure of the steam in the main steam pipeline changes, the pressure self-regulating control device adjusts the flow area of ​​the steam entering the high-pressure cylinder of the steam turbine.

5. A steam supply structure for a thermal power plant according to claim 4, characterized in that, The pressure self-regulating control device includes: The connecting pipe is installed between the main steam pipeline and the high-pressure cylinder of the steam turbine. The corrugated pipe has one end fixed to the end of the main steam pipe near the connecting pipe, and the other end slidably disposed on the outside of the connecting pipe. A valve stem is fitted onto the inner wall of the bellows, and a connecting rod is rotatably connected to its end. A guide groove is formed on the inner wall of the connecting pipe near the high-pressure cylinder of the steam turbine. A slider is slidably connected in the guide groove. A toothed plate is provided at the bottom of the slider. The toothed plate is located above the valve stem. The gear is rotatably connected to the wall of the connecting pipe via a rotating shaft and meshes with a toothed plate; the end of the connecting rod is rotatably connected to the rotating shaft. The fixing bracket is installed at the end of the connecting pipe that connects to the high-pressure cylinder of the steam turbine. An eccentric ball plug is slidably connected to the fixed frame and is located in the communication hole between the connecting pipe and the high-pressure cylinder of the steam turbine; The push rod has one end rotatably connected to the surface of the eccentric ball plug, and the other end rotatably connected to the outside of the gear; In the bellows extension and retraction state, the valve stem drives the connecting rod to rotate the gear, which in turn drives the push rod to push the eccentric ball plug to displacement.

6. A steam supply structure for a thermal power plant according to claim 5, characterized in that, The push rod is rotatably connected to the outer edge of the gear.

7. A steam supply structure for a thermal power plant according to claim 5, characterized in that, The eccentric ball plug has a structure that is narrow at the top and wide at the bottom; The eccentric ball plug has vertical rods on opposite sides, and the two vertical rods are slidably connected to the fixed frame.

8. A steam supply structure for a thermal power plant according to claim 4, characterized in that, Also includes: The reheat steam pipeline and the connecting pipeline are provided. One end of the reheat steam pipeline is connected to the high-pressure cylinder of the steam turbine, and the other end is connected to the intermediate and low-pressure cylinder of the steam turbine through the boiler reheater. The intermediate and low-pressure cylinder of the steam turbine is connected to the connecting pipeline. The installation components are located on the outside of the main steam pipe, reheat steam pipe, and connecting pipes; An insulation layer is disposed on the inner wall of the mounting component.

9. A steam supply structure for a thermal power plant according to claim 8, characterized in that, The installation components include: The No. 1 arc-shaped plate has a rotating rod rotatably connected to one end of its inner cavity; A magnet block is disposed at the other end of the inner cavity of the first arc-shaped plate; The second arc-shaped plate is connected to the rotating rod at one end and has a metal plate at the other end, which cooperates with the magnet block.

10. A steam supply device, characterized in that, The steam supply equipment is equipped with the steam supply structure for thermal power plants as described in any one of claims 1-9.

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