Steam turbine drain capacity expansion device suitable for middle-low position arrangement

Abstract

The invention discloses a steam turbine drainage capacity expansion device suitable for middle-low position arrangement, and relates to the technical field of drainage capacity expansion devices. The device comprises a condenser and further comprises an expansion barrel, an air inlet pipe is constructed at one end of the expansion barrel, the air inlet pipe detachably communicates with a bent pipe through a flange, an air outlet pipe communicating with the top of the condenser is constructed at the top of the expansion barrel, and two liquid inlet pipes located on the two sides of the air outlet pipe are constructed at the top of the expansion barrel; the pressure storage pipe detachably communicates with the other end of the bent pipe through a flange, and a plurality of pressure dividing pipes communicating with the bottom of the condenser are arranged on the pressure storage pipe in the length direction of the pressure storage pipe in an array mode. According to the device, drained water can be pressurized in the pressure storage pipe, then the drained water is rapidly injected into the capacity expansion barrel to drive the packing rotating wheel to rotate, heat energy is dispersed, meanwhile, cooling water is evenly splashed into the capacity expansion barrel through the packing rotating wheel, the cooling efficiency is improved, and the equipment safety is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of drain expansion devices, and in particular to a steam turbine drain expansion device suitable for medium and low position arrangements. Background Art

[0002] The drain expansion tank is a device used in the drain system. Its main function is to expand and reduce the pressure of the drain in the pressure drain pipeline, separate the steam and drain, and introduce the steam into the heat exchanger or deaerator to make full use of its thermal energy, while the drain is introduced into the drain tank and regularly sent to the water supply system. This process helps to improve the efficiency and economy of the steam turbine because it allows more efficient use of thermal energy and working fluid circulation. The condenser establishes and maintains a high vacuum at the exhaust port of the steam turbine, so that the steam expands to the lowest possible pressure in the steam turbine, converting more thermal energy into mechanical energy, and condensing the exhaust gas of the steam turbine into water, maintaining the circulation of working fluids, and improving the economy of the power plant.

[0003] The existing drain device is connected to the condenser to reduce the pressure and expand the capacity of the drain in the pressure drain pipeline. In this process, the steam is condensed and a large amount of heat energy is released. Overheating may occur during operation, and an appropriate amount of cooling water needs to be added to effectively reduce the system temperature, thereby avoiding damage to equipment and pipelines due to overheating and ensuring that the system operates within a safe operating temperature range. However, the existing drain expansion tank does not have the function of evenly adding cooling water, and cannot quickly cool down, resulting in a reduced service life of the equipment.

[0004] Therefore, the present invention proposes a steam turbine drain expansion device that is suitable for medium and low position arrangements. Summary of the invention

[0005] The purpose of the present application is to solve the problems in the above-mentioned background technology, and to provide a steam turbine drain expansion device suitable for medium and low position arrangements.

[0006] In order to achieve the above-mentioned purpose, this application specifically adopts the following technical solutions: A steam turbine drain expansion device adapted to a medium-low position arrangement includes a condenser and further includes: An expansion barrel, one end of which is provided with an air inlet pipe, the air inlet pipe is detachably connected to a bend pipe through a flange, the top of the expansion barrel is provided with an air outlet pipe connected to the top of the condenser, and the top of the expansion barrel is provided with two liquid inlet pipes located on both sides of the air outlet pipe; A pressure storage pipe is detachably connected to the other end of the elbow through a flange, and a plurality of pressure dividing pipes connected to the bottom of the condenser are arranged in an array along the length direction of the pressure storage pipe, and a flow blocking mechanism located between two pressure dividing pipes is installed in the pressure storage pipe; The temperature control component comprises a mesh frame inserted and installed in two liquid inlet pipes, the bottom of the two mesh frames are connected to an arc-shaped baffle plate suspended in the expansion barrel through a vertical rod, a horizontally arranged sealing wheel is rotatably installed on the lower side of the arc-shaped baffle plate, and an airflow turntable is fixedly connected to one end of the sealing wheel facing the air inlet pipe; The drainage component comprises a water outlet pipe fixedly connected to the bottom of the expansion barrel, an impeller disc is rotatably installed in the water outlet pipe, and a centrifugal expansion fan is fixedly connected to the impeller disc.

[0007] Furthermore, the diameters of the multiple pressure-dividing tubes decrease successively toward the direction of the bend, and the flow-blocking mechanism includes column blocks constructed on the upper and lower sides of the pressure storage tube, a rotating shaft is rotatably installed between the two column blocks, a torsion spring connected to the rotating shaft is fixedly connected inside the column block, and a one-way flip flow-blocking plate is fixedly connected to the rotating shaft.

[0008] Furthermore, a plurality of L-shaped diverter plates are constructed in the pressure storage tube, and the L-shaped diverter plates are arranged between the baffle plate and the pressure dividing tube close to the side of the bend pipe, one end of the L-shaped diverter plate is in contact with the rotating shaft, and a horizontally oppositely arranged one-way groove is constructed in the pressure storage tube, and a baffle plate slidably installed in the one-way groove is constructed on the baffle plate.

[0009] Furthermore, a stepped groove is constructed in the liquid inlet pipe, and the mesh frame includes a bottom frame and a top plate which are slidably inserted in the stepped groove, and a plurality of water pipes are installed between the bottom frame and the top plate, a stop block is constructed at the bottom end of the vertical rod and the top end slides through the arc-shaped baffle plate and one of the water pipes, a limiting bolt is threadedly connected to the top end of the vertical rod, and the expansion barrel is constructed with a bent pipe and an inspection door is installed at the other end.

[0010] Furthermore, there are two isolation wheels, and the arc-shaped spoiler includes a semi-cylindrical frame plate, and two connecting plates are constructed at both ends of the semi-cylindrical frame plate. The isolation wheel is rotatably mounted on the connecting plates, and the outer arc end of the semi-cylindrical frame plate is arranged upward and has two strip openings constructed thereon for the isolation wheel to pass through.

[0011] Furthermore, both ends of the bottom of the semi-cylindrical frame plate are constructed with outwardly extending horizontal frames, the horizontal frames are constructed with water storage grooves, and the water storage grooves are constructed with a plurality of water leakage holes in an array.

[0012] Furthermore, the sealing wheel includes a rotating rod rotatably installed between two relatively connecting plates, the middle of the rotating rod is configured with a shifting blade for rotating and blocking the strip-shaped opening, and the airflow turntable is connected to one end of the rotating rod facing the air inlet pipe.

[0013] Furthermore, a support frame is constructed at the bottom of the water outlet pipe, and the impeller disk includes a column rotatably mounted on the support frame. A plurality of connecting shafts with successively decreasing diameters are constructed on the top of the column, and annular impellers with successively decreasing diameters are fixedly sleeved on the plurality of connecting shafts.

[0014] Furthermore, the centrifugal expansion fan includes a connecting tube fixedly connected to the upper end of the column, a receiving tube is fixedly connected to the connecting tube, a retaining ring is constructed on the top of the receiving tube, a slider is vertically slidably installed in the receiving tube, and a plurality of rotating expansion bars obliquely arranged in the retaining ring are hinged on the slider along its circumference.

[0015] Furthermore, a hot well is constructed at the bottom of the condenser and an air inlet is constructed at the top. The hot well is connected to the water outlet pipe through a pressure drain pipeline, and the air inlet is connected to the outlet pipe through a steam pipeline. The pressure drain pipeline is arranged above the condenser trip water level.

[0016] The beneficial effects of this application are as follows: The present application provides a flow-blocking mechanism in the pressure storage tube, which can increase the pressure of the hydrophobic fluid in the pressure storage tube and then quickly inject it into the expansion barrel. The rapid flow is used to drive the isolation wheel to rotate, thereby dissipating the heat energy. When the temperature inside the expansion barrel is too high, cooling water can be injected through the liquid inlet pipe. At the same time, the rotation of the isolation wheel can be used to evenly sprinkle the cooling water into the expansion barrel, thereby achieving uniform heat absorption, improving the cooling efficiency, and ensuring the safety of the equipment.

[0017] The present application can increase the time that the cooling water stays in the middle of the expansion barrel through the arc-shaped baffle plate, thereby further improving the cooling efficiency.

[0018] The present application drives the impeller disk to rotate through the flow of condensed water, which stirs the accumulated water so that it can quickly absorb heat and also drives the centrifugal expansion fan to rotate. The centrifugal expansion fan can generate a spiral upward airflow, reduce the temperature of the lower layer of the expansion barrel, and ensure the safety of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural diagram of this application; Figure 2 It is a partial three-dimensional structural diagram of this application; Figure 3 This application Figure 2 Half-section of the three-dimensional structure; Figure 4 This is a half-section diagram of the three-dimensional structure of the pressure storage tube of the present application; Figure 5 This is another half-section view of the three-dimensional structure of the pressure storage tube of the present application; Figure 6 This application Figure 5 The enlarged view of point A in the middle; Figure 7 This is a three-dimensional structural diagram of the temperature control component of this application; Figure 8 This application Figure 7 A partial cross-sectional view of the three-dimensional structure; Fig. 9 This is a three-dimensional structural diagram of the centrifugal expansion fan of the present application; Fig.10 This is a half-section diagram of the three-dimensional structure of the centrifugal expansion fan of the present application; Figure numerals: 1, condenser; 101, hot well; 102, air inlet; 103, pressure drain pipeline; 104, steam pipeline; 2, expansion barrel; 201, air inlet pipe; 202, elbow; 203, air outlet pipe; 204, liquid inlet pipe; 2041, stepped groove; 205, inspection door; 3, pressure storage pipe; 301, pressure dividing pipe; 302, L-type diverter plate; 303, one-way groove; 4, flow blocking mechanism; 401, column block; 402, rotating shaft; 403, torsion spring; 404, flow blocking plate; 4041, blocking plate; 5, temperature control assembly; 501, mesh frame; 5011, bottom frame; 5012, top plate; 5013, water pipe; 502, vertical rod; 5021 , block; 5022, limit bolt; 503, arc-shaped baffle; 5031, semi-cylindrical frame plate; 50311, horizontal frame; 50312, water storage groove; 50313, water leakage hole; 5032, connecting plate; 5033, strip mouth; 504, sealing wheel; 5041, rotating rod; 5042, moving blade; 505, air flow turntable; 6, drainage assembly; 601, outlet pipe; 6011, support frame; 602, impeller disk; 6021, column; 6022, connecting shaft; 6023, annular impeller; 7, centrifugal expansion fan; 701, connecting pipe; 702, receiving pipe; 703, retaining ring; 704, slider; 705, rotating expansion strip. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0021] like Figure 1-Figure 5 As shown, a steam turbine drain expansion device adapted to a medium-low position arrangement proposed in one embodiment of the present application includes a condenser 1, and also includes: The expansion barrel 2 is provided with an air inlet pipe 201 at one end, and a bend pipe 202 is detachably connected to the air inlet pipe 201 through a flange. The top of the expansion barrel 2 is provided with an air outlet pipe 203 connected to the top of the condenser 1, and the top of the expansion barrel 2 is provided with two liquid inlet pipes 204 located on both sides of the air outlet pipe 203. The expansion barrel 2 is horizontal as a whole, and the diameter of the air outlet pipe 203 is larger than the diameter of the two liquid inlet pipes 204. The liquid inlet pipes 204 are arranged on both sides of the air outlet pipe 203. When cooling water is injected into the expansion barrel 2 through the liquid inlet pipes 204, the cooling water can quickly contact with the steam, thereby reducing the temperature in the expansion barrel 2 and improving the cooling speed. The pressure storage pipe 3 is detachably connected to the other end of the elbow 202 through a flange. A plurality of pressure-dividing pipes 301 connected to the bottom of the condenser 1 are arrayed on the pressure storage pipe 3 along its length direction. A flow-blocking mechanism 4 located between the pressure-dividing pipes 301 is installed in the pressure storage pipe 3. It should be noted that the diameter of the expansion barrel 2 is larger than the diameter of the pressure storage pipe 3, and the diameter of the pressure storage pipe 3 is larger than the diameter of the pressure-dividing pipe 301. When the drain enters the pressure storage pipe 3 through the pressure-dividing pipe 301, a small expansion and pressure reduction will occur. At this time, the flow-blocking mechanism 4 can divert the pressure to one side, so that the drain flows only toward one end of the elbow 202 through the pressure, and can store a certain pressure under the obstruction of another flow-blocking mechanism 4, and then accelerate the drain to flow into the expansion barrel 2. The temperature control component 5 includes a mesh frame 501 inserted and installed in the two liquid inlet pipes 204. The bottom of the two mesh frames 501 is connected to an arc-shaped baffle plate 503 suspended in the expansion barrel 2 through a vertical rod 502. A horizontally arranged sealing wheel 504 is rotatably installed on the lower side of the arc-shaped baffle plate 503. The sealing wheel 504 is fixedly connected to an air flow turntable 505 at one end facing the air inlet pipe 201. When too much heat is accumulated in the expansion barrel 2 and cannot be released, cooling water can be injected into the expansion barrel 2 through the liquid inlet pipe 204. The cooling water will first be preliminarily dispersed through the mesh frame 501, so that the contact area with the heat is increased when it enters the expansion barrel 2, thereby increasing the cooling efficiency. Then the cooling water will fall on the arc-shaped baffle plate 503, and the arc-shaped baffle plate 503 will again block the falling trend, which will delay the falling of the cooling water. The time can not only make it stay longer in the middle of the expansion barrel 2, but also evenly cover the cooling water on the surface of the arc-shaped baffle plate 503, so that it can further increase the contact area with the heat, thereby improving the cooling efficiency. During this period, the hydrophobic water is temporarily stored in the pressure by the baffle mechanism 4 in the pressure storage pipe 3 and then released, and will quickly rush into the expansion barrel 2, reducing the pressure and expanding the capacity in the expansion barrel 2. While releasing the pressure, it will accelerate the impact on the isolation wheel 504, so that the isolation wheel 504 rotates on the arc-shaped baffle plate 503, and the cooling water sliding down along the arc-shaped baffle plate 503 is hit for the second time, so that it diffuses again for better heat absorption. The triple efficiency increase greatly improves the cooling efficiency, and the temperature in the expansion barrel 2 can be quickly controlled to be kept below the standard temperature, which ensures the safety of the equipment and improves the service life of the equipment. The drainage component 6 includes a water outlet pipe 601 fixedly connected to the bottom of the expansion barrel 2, and an impeller disk 602 is rotatably installed in the water outlet pipe 601. A centrifugal expansion fan 7 is fixedly connected to the impeller disk 602. The hydrophobicity in the expansion barrel 2 separates steam and condensed water through expansion and pressure reduction. The steam is discharged from the air outlet pipe 203, and the condensed water is discharged from the water outlet pipe 601. When the condensed water is discharged, the water flow will drive the impeller disk 602 to rotate, which can stir the water flow and enable the condensed water to absorb part of the heat. At the same time, the rotation of the impeller disk 602 is used to drive the centrifugal expansion fan 7 to rotate, so that it can generate a rotating upward airflow, accelerate the rising of steam, reduce the temperature of the lower layer of the expansion barrel 2, and ensure the safety of the equipment.

[0022] like Figure 2-Figure 6As shown, in some embodiments, the diameters of the plurality of pressure-dividing tubes 301 decrease in sequence toward the direction of the elbow 202, and the flow-blocking mechanism 4 includes column blocks 401 constructed on the upper and lower sides of the pressure-storing tube 3, a rotating shaft 402 is rotatably installed between the two column blocks 401, a torsion spring 403 connected to the rotating shaft 402 is fixedly connected inside the column block 401, and a unidirectional flip-over baffle 404 is fixedly connected to the rotating shaft 402. The plurality of pressure-dividing tubes 301 can be provided to separately introduce high-pressure and low-pressure hydrophobicity, so as to prevent the high-pressure hydrophobicity from rejecting and containing the low-pressure hydrophobicity. It should be noted that the high-pressure hydrophobicity portion is connected to the pressure-dividing tube 301 with the largest diameter, which is in the present application. Figure 2 The leftmost part, that is, the end of the pressure storage tube 3 away from the bend tube 202, can effectively squeeze the multiple baffles 404 on its right side to flip over, so that the hydrophobic gas can be smoothly injected into the expansion barrel 2, and the pressure of the pressure pipeline connected to the remaining pressure-dividing tubes 301 is reduced. When the hydrophobic gas is injected, it will be blocked by the baffle 404 on its left side to avoid being affected by the high-pressure hydrophobic gas. At the same time, the torsion spring 403 is used to drive the baffle 404 to consume the pressure of the high-pressure hydrophobic gas, so that the pressure is balanced and then injected into the expansion barrel 2, thereby increasing safety. At the same time, the baffle 404 can be used to accumulate a certain amount of pressure and then release it, which can increase the speed at which the hydrophobic gas flows into the expansion barrel 2, making it convenient to drive the airflow turntable 505 to rotate.

[0023] like Figure 4 As shown, in some embodiments, a plurality of L-shaped flow dividers 302 are constructed in the pressure storage tube 3, and the L-shaped flow divider plate 302 is arranged between the baffle plate 404 and the pressure divider tube 301 on the side close to the elbow 202, and one end of the L-shaped flow divider plate 302 abuts against the rotating shaft 402, and a horizontally oppositely arranged one-way groove 303 is constructed in the pressure storage tube 3, and the baffle plate 404 is constructed with a baffle 4041 slidably installed in the one-way groove 303. It should be noted that the one-way groove 303 is an arc groove for the arc sliding of the baffle 4041, that is, it rotates with the baffle plate 404 around the rotating shaft 402, and the one-way groove 303 is provided. A limit plate is constructed at one end of 03 to prevent the baffle 4041 from rotating in the opposite direction. When the airflow enters the pressure dividing tube 301, it will diffuse in all directions and be blocked by the L-shaped flow dividing plate 302, so that the pressure will only diffuse to the baffle 404 on one side of the rotating shaft 402. At this time, the baffle 4041 on the baffle 404 on this side will conflict with the end of the one-way groove 303, and the baffle 404 cannot rotate. The pressure can push the baffle 404 on the side close to the elbow 202 to rotate, thereby realizing unilateral pressure release, avoiding repulsion with the pressure of other parts of the pressure dividing tube 301, and ensuring smooth hydrophobic transportation.

[0024] like Figure 2 , Figure 7 and Figure 8As shown, in some embodiments, a stepped groove 2041 is configured in the liquid inlet pipe 204, the net frame 501 includes a bottom frame 5011 and a top plate 5012 which are slidably inserted in the stepped groove 2041, and a plurality of water pipes 5013 are installed between the bottom frame 5011 and the top plate 5012, a stopper 5021 is configured at the bottom end of the vertical rod 502, and the top end slides through the arc-shaped baffle plate 503 and one of the water pipes 5013, the top end of the vertical rod 502 is threadedly connected to a limiting bolt 5022, and the expansion barrel 2 is configured with another curved pipe 202. An inspection door 205 is installed at one end. The screen frame 501 is inserted into the stepped groove 2041, which can facilitate the disassembly and installation of the screen frame 501. When the temperature control component 5 needs to be repaired and replaced, the limit bolt 5022 can be removed to separate the vertical rod 502 from the screen frame 501. At this time, the screen frame 501 can be taken out of the stepped groove 2041 alone, and then the inspection door 205 is opened to remove the arc-shaped spoiler 503 and the vertical rod 502 from the inspection door 205. It is easy to operate, easy to disassemble the device, and convenient for maintenance and cleaning operations.

[0025] like Figure 7-Figure 8 As shown, in some embodiments, the number of the packing rotor 504 is two, the arc-shaped spoiler 503 includes a semi-cylindrical frame plate 5031, and two connecting plates 5032 are configured at both ends of the semi-cylindrical frame plate 5031. The packing rotor 504 is rotatably mounted on the connecting plate 5032. The outer arc end of the semi-cylindrical frame plate 5031 is upwardly arranged and has two strip-shaped openings 5033 configured thereon for the packing rotor 504 to movably penetrate. It should be noted that the packing rotor 504 is used in the initial state. By blocking the strip opening 5033, the water falling on the semi-cylindrical frame plate 5031 can flow downward along its arc surface. When the sealing wheel 504 rotates, the strip opening 5033 will be opened intermittently, thereby hitting the cooling water at the strip opening 5033 to cause it to diffuse. At the same time, a part of the cooling water will fall into the strip opening 5033 and enter the bottom of the semi-cylindrical frame plate 5031, thereby increasing the retention space of the cooling water, increasing its contact area with the heat, and thereby improving the cooling effect.

[0026] like Figure 7 As shown, in some embodiments, both ends of the bottom of the semi-cylindrical frame plate 5031 are constructed with outwardly extending horizontal frames 50311, and a water storage groove 50312 is constructed on the horizontal frame 50311. A plurality of leakage holes 50313 are arrayed in the water storage groove 50312. Part of the cooling water will flow into the water storage groove 50312 along the curved surface of the semi-cylindrical frame plate 5031, and be stored in the water storage groove 50312, and dispersedly flow out at the leakage holes 50313, thereby increasing the contact area between the cooling water and the space inside the expansion barrel 2, and improving the cooling efficiency.

[0027] like Figure 8As shown, in some embodiments, the isolation wheel 504 includes a rotating rod 5041 rotatably installed between two relatively connecting plates 5032, and a moving blade 5042 for rotating and blocking the strip-shaped opening 5033 is constructed in the middle of the rotating rod 5041. The airflow turntable 505 is connected to the end of the rotating rod 5041 facing the air inlet pipe 201. It should be noted that the moving blade 5042 includes an L-shaped blade and a hook-shaped blade. An L-shaped blade and a hook-shaped blade form a group. There are three groups of blades in a circular array on the rotating rod 5041, one group of which is used to block the strip-shaped opening 5033. When the rotating rod 5041 rotates, the strip-shaped opening 5033 can be opened intermittently, so that part of the cooling water falls and part of the cooling water continues to flow along the arc surface.

[0028] like Figure 3 , Fig. 9 and Fig.10 As shown, in some embodiments, a support frame 6011 is constructed at the bottom of the water outlet pipe 601, and the impeller disk 602 includes a column 6021 rotatably mounted on the support frame 6011. A plurality of connecting shafts 6022 with successively decreasing diameters are constructed on the top of the column 6021, and annular impellers 6023 with successively decreasing diameters are fixedly sleeved on the plurality of connecting shafts 6022, respectively. The plurality of columns 6021 can be provided to form a stepped shape, which is convenient for installing and removing the plurality of annular impellers 6023 and increasing convenience. The annular impellers 6023 with diameters ranging from small to large are distributed from top to bottom to form a conical tower wheel, which can better receive water flow and make the plurality of annular impellers 6023 driven by the water flow at the same time, thereby increasing the rotational force of the column 6021 and ensuring the smooth rotation of the centrifugal expansion fan 7.

[0029] like Fig. 9 and Fig.10 As shown, in some embodiments, the centrifugal expansion fan 7 includes a connecting tube 701 fixedly connected to the upper end of the column 6021, a receiving tube 702 is fixedly connected to the connecting tube 701, a retaining ring 703 is configured on the top of the receiving tube 702, a slider 704 is vertically slidably installed in the receiving tube 702, and a plurality of rotating expansion bars 705 obliquely arranged in the retaining ring 703 are hinged on the slider 704 along its circumference. It should be noted that in the initial state, the slider 704 is located at the inner bottom of the receiving tube 702 under the influence of gravity. When the impeller disk 602 rotates, it will drive the receiving tube 702 to rotate, and the rotating expansion bar 705 tilted on the retaining ring 703 will use centrifugal force to move upward, gradually driving the slider 704 to move up and abut against the retaining ring 703. At this time, the rotating expansion bar 705 is completely above the retaining ring 703, and is expanded to a horizontal state by centrifugal force, and rotates in the expansion barrel 2, so that an upward airflow is generated in the expansion barrel 2, accelerating the steam rising speed, thereby reducing the bottom temperature of the expansion barrel 2 and ensuring the safety of the equipment.

[0030] like Figure 1As shown, in some embodiments, a hot well 101 is constructed at the bottom of the condenser 1 and an air inlet 102 is constructed at the top. The hot well 101 is connected to the outlet pipe 601 through a pressure drain pipe 103, and the air inlet 102 is connected to the outlet pipe 601 through a steam pipe 104. The pressure drain pipe 103 is arranged above the tripping water level of the condenser 1. It should be noted that the steam turbine is connected with a pipeline drain expansion tank, a body drain expansion tank and the condenser 1, wherein the body drain expansion tank is the expansion barrel 2 in the present device, and the three are interconnected, and the bottom heights of the two drain expansion tanks are higher than the bottom of the condenser 1, and the specific values ​​are 2100mm, respectively, while the bottom height of the condenser 1 is only 500mm, so the water in the two expansion tanks can be adjusted according to the actual situation. It flows to condenser 1 by gravity, and there is no need to add a drain pump. Even if the condenser 1 has a high water level and the steam turbine trips, the tripping water level of condenser 1 is 1500mm, which is 2000mm from the ground, and the lowest drain header height on the two drain expansion tanks is 2400mm. That is to say, no matter what working condition the condenser 1 is in, the two drain expansion tanks will not cause poor drainage due to the high water level of condenser 1 and the drain headers being filled with water. The optimized pipeline drainage layout controls the pipeline drainage to be connected above the lowest water level of the hot well 101, thereby eliminating the drain pump of the drain system, ensuring smooth drainage, avoiding the safety hazard of water inflow to the turbine caused by drainage pump equipment failure or control failure, further increasing safety, and ensuring the service life of the equipment.

[0031] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A steam turbine drain expansion device adapted for medium and low position arrangement, comprising a condenser (1), characterized in that: Also includes: An expansion barrel (2), wherein one end of the expansion barrel (2) is provided with an air inlet pipe (201), the air inlet pipe (201) is detachably connected to a bend pipe (202) via a flange, the top of the expansion barrel (2) is provided with an air outlet pipe (203) connected to the top of the condenser (1), and the top of the expansion barrel (2) is provided with two liquid inlet pipes (204) located on both sides of the air outlet pipe (203); A pressure storage pipe (3) is detachably connected to the other end of the elbow (202) via a flange, the pressure storage pipe (3) being provided with a plurality of pressure dividing pipes (301) connected to the bottom of the condenser (1) in an array along its length direction, and a flow blocking mechanism (4) located between two of the pressure dividing pipes (301) is installed in the pressure storage pipe (3); The temperature control component (5) comprises a mesh frame (501) inserted and installed in two liquid inlet pipes (204); the bottoms of the two mesh frames (501) are connected to an arc-shaped flow-blocking plate (503) suspended in the expansion barrel (2) through a vertical rod (502); a horizontally arranged sealing wheel (504) is rotatably installed on the lower side of the arc-shaped flow-blocking plate (503); and an airflow turntable (505) is fixedly connected to one end of the sealing wheel (504) facing the air inlet pipe (201); The drainage assembly (6) comprises a water outlet pipe (601) fixedly connected to the bottom of the expansion barrel (2), an impeller disc (602) rotatably mounted in the water outlet pipe (601), and a centrifugal expansion fan (7) fixedly connected to the impeller disc (602).

2. A steam turbine drain expansion device adapted to a medium and low position arrangement according to claim 1, characterized in that: The diameters of the plurality of pressure-dividing tubes (301) decrease in sequence in a direction toward the curved tube (202); the flow-blocking mechanism (4) comprises column blocks (401) constructed on the upper and lower sides of the pressure-storing tube (3); a rotating shaft (402) is rotatably mounted between the two column blocks (401); a torsion spring (403) connected to the rotating shaft (402) is fixedly connected inside the column block (401); and a unidirectionally flippable flow-blocking plate (404) is fixedly connected to the rotating shaft (402).

3. A steam turbine drain expansion device adapted to a mid-low position arrangement according to claim 2, characterized in that: The pressure storage tube (3) is provided with a plurality of L-shaped flow dividers (302), the L-shaped flow dividers (302) being arranged between the baffle plate (404) and the pressure divider tube (301) on the side close to the curved tube (202), one end of the L-shaped flow divider plate (302) being in contact with the rotating shaft (402), the pressure storage tube (3) is provided with one-way grooves (303) arranged horizontally opposite to each other, and the baffle plate (404) is provided with a baffle (4041) slidably mounted in the one-way groove (303).

4. The steam turbine drain expansion device adapted to the middle and low position arrangement according to claim 1, characterized in that: The liquid inlet pipe (204) is provided with a stepped groove (2041). The net frame (501) comprises a bottom frame (5011) and a top plate (5012) which are slidably inserted into the stepped groove (2041). A plurality of water pipes (5013) are installed between the bottom frame (5011) and the top plate (5012). A stopper (5021) is provided at the bottom end of the vertical rod (502), and the top end slides through the arc-shaped baffle plate (503) and one of the water pipes (5013). The top end of the vertical rod (502) is threadedly connected with a limiting bolt (5022). The expansion barrel (2) is provided with a curved pipe (202), and the other end thereof is provided with an inspection door (205).

5. The steam turbine drain expansion device adapted to the middle and low position arrangement according to claim 1, characterized in that: The number of the isolation rotors (504) is two, and the arc-shaped baffle plate (503) comprises a semi-cylindrical frame plate (5031). Two connecting plates (5032) are constructed at both ends of the semi-cylindrical frame plate (5031). The isolation rotor (504) is rotatably mounted on the connecting plates (5032). The outer arc end of the semi-cylindrical frame plate (5031) is arranged upward and has two strip openings (5033) constructed thereon for the isolation rotor (504) to movably pass through.

6. A steam turbine drain expansion device adapted to a mid-low position arrangement according to claim 5, characterized in that: Both ends of the bottom of the semi-cylindrical frame plate (5031) are constructed with outwardly extending horizontal frames (50311), the horizontal frame (50311) is constructed with a water storage groove (50312), and a plurality of water leakage holes (50313) are constructed in an array in the water storage groove (50312).

7. The steam turbine drain expansion device adapted to the middle and low position arrangement according to claim 5, characterized in that: The sealing wheel (504) comprises a rotating rod (5041) rotatably mounted between two opposite connecting plates (5032), a moving blade (5042) for rotating and blocking the strip-shaped opening (5033) is configured in the middle of the rotating rod (5041), and the airflow turntable (505) is connected to one end of the rotating rod (5041) facing the air inlet pipe (201).

8. The steam turbine drain expansion device adapted to the middle and low position arrangement according to claim 1, characterized in that: A support frame (6011) is constructed at the bottom of the water outlet pipe (601); the impeller disc (602) comprises a column (6021) rotatably mounted on the support frame (6011); a plurality of connecting shafts (6022) with successively decreasing diameters are constructed at the top of the column (6021); and annular impellers (6023) with successively decreasing diameters are respectively fixedly sleeved on the plurality of connecting shafts (6022).

9. The steam turbine drain expansion device adapted to the middle and low position arrangement according to claim 8, characterized in that: The centrifugal expansion fan (7) comprises a connecting pipe (701) fixedly connected to the upper end of the column (6021), a receiving pipe (702) fixedly connected to the connecting pipe (701), a retaining ring (703) configured at the top of the receiving pipe (702), a sliding block (704) vertically slidably installed in the receiving pipe (702), and a plurality of rotating expansion bars (705) obliquely arranged in the retaining ring (703) are hingedly connected to the sliding block (704) along its circumference.

10. The steam turbine drain expansion device adapted to the middle and low position arrangement according to claim 1, characterized in that: The condenser (1) is provided with a hot well (101) at the bottom and an air inlet (102) at the top; the hot well (101) is connected to a water outlet pipe (601) via a pressure drain pipe (103); the air inlet (102) is connected to an air outlet pipe (203) via a steam pipe (104); and the pressure drain pipe (103) is arranged above a tripping water level of the condenser (1).

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