Lateral steam exhaust condenser rigidly connected with low-pressure cylinder

Abstract

The utility model discloses a lateral steam exhaust condenser rigidly connected with a low-pressure cylinder, and belongs to the field of steam-gas combined cycle steam turbines. The condenser throat part and the low-pressure cylinder are rigidly welded without an expansion joint and share a sliding dead point; the shell support is arranged at a high position, so that the vertical expansion difference is reduced; the hot well sinks and is suspended at the bottom of the shell, and the bottom elevation is lower than a drainage point. Vacuum thrust is balanced through rigid connection, and cost and leakage risks caused by an expansion joint are eliminated; the high-position support reduces the interface load, the sinking hot well realizes drainage self-flow, the system is simplified, and the reliability is improved; the limiting support and the fixed support are matched to ensure expansion coordination, and the stability of the unit is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to steam-gas combined cycle steam turbine technical field, concretely relates to a condenser for lateral exhaust steam turbine unit, especially relates to a lateral exhaust condenser structure which realizes vacuum thrust balance and optimizes drain system through rigid connection. BACKGROUND

[0002] With the optimization of global energy structure and the development of electric power industry, gas-steam combined cycle power generation becomes the important development direction of electric power industry due to the advantages of high efficiency and environmental protection. In the combined cycle power station, in order to reduce the height of workshop and optimize equipment arrangement, the steam turbine is often designed as lateral exhaust form, and correspondingly, the condenser needs to be arranged with the steam turbine in the same operation layer or temporary layer (height difference is about 6m), located on the side of the steam turbine, and forms lateral exhaust layout. Although this arrangement can reduce the construction cost of workshop, it also brings a series of technical problems.

[0003] The condenser is in a high vacuum state when operating, and in the conventional design, the condenser is connected with the low-pressure cylinder through the expansion joint, at this time, the horizontal vacuum thrust (usually up to hundreds of tons) generated by the vacuum inside the condenser will act on the condenser and the low-pressure cylinder respectively. Since the low-pressure cylinder has much lower horizontal thrust resistance than vertical thrust resistance, the vacuum thrust is likely to exceed the allowable range of safe operation of the low-pressure cylinder, threatening the stability of the unit.

[0004] To solve the above problems, the prior art usually sets a vacuum force self-balancing expansion joint between the condenser and the low-pressure cylinder, balances the vacuum thrust by arranging vacuum force balance pull rods in the exhaust direction of the low-pressure cylinder, and absorbs the thermal expansion difference in the vertical direction due to the arrangement of height difference. However, this structure has the following defects: first, the additional expansion joint increases the equipment cost, and the expansion joint itself becomes a potential risk point of system leakage; second, as the capacity of the unit increases, the size of the exhaust port of the low-pressure cylinder increases accordingly, and the balance pull rods uniformly distributed on the exhaust port have large differences in torsion angle due to the height difference during operation, thereby generating additional load and affecting the safe operation of the unit.

[0005] In addition, after the low-position arrangement of the steam turbine, the reliability of the drain system faces severe challenges. The drain of the drain expansion vessel of the conventional low-position arrangement unit needs to be pumped to the condenser hot well through the drain pump, and the failure of the drain pump and other equipment may cause the steam turbine to be flooded, and the complex drain system increases the operation and maintenance cost and difficulty.

[0006] In summary, the existing lateral exhaust condenser structure has the following deficiencies in vacuum thrust balance, equipment cost, operation reliability and drain system design, and a new condenser structure is urgently needed which can effectively balance the vacuum thrust, simplify the structure, reduce the cost and improve the reliability of the drain. UTILITY MODEL CONTENTS

[0007] The utility model discloses a rigid connection of low-pressure cylinder's lateral exhaust condenser.

[0008] The utility model discloses a rigid connection of low-pressure cylinder's lateral exhaust condenser, including throat, shell, hot well and support assembly, one end of throat is connected directly through rigid welding with the exhaust port of low-pressure cylinder, the other end of throat is connected with shell, and hot well is suspended in the bottom of shell in the sinking state, support assembly includes fixed support, sliding support, limit support no.

[0009] Further, the throat is arranged obliquely, and after installation, the center line of the steam turbine exhaust is higher than the center line of the shell.

[0010] Further, the fixed support is a common dead point of the condenser and the low-pressure cylinder, the arrangement elevation of the sliding support is consistent with the support plane elevation of the low-pressure cylinder, and the contact surface between the sliding support and the bottom of the shell is provided with a low-friction coefficient material layer.

[0011] Further, the bottom elevation of the hot well is lower than the elevation of all drainage points of the steam turbine system, and the hot well is fixedly connected with the bottom of the shell through a suspension structure.

[0012] Further, the limit support no. 1 includes a guide rail extending along the axial direction of the steam turbine, for limiting the condenser from moving in the radial direction of the steam turbine and guiding the axial sliding of the steam turbine, and the limit support no. 2 includes a guide rail extending along the radial direction of the steam turbine, for limiting the condenser from moving in the axial direction of the steam turbine and guiding the radial sliding of the steam turbine.

[0013] Further, the intersection of the guide rail of the limit support no. 1 and the guide rail of the limit support no. 2 coincides with the position of the fixed support, forming an expansion dead point of the condenser.

[0014] Further, the two sides of the shell are respectively provided with a water inlet chamber, a water outlet chamber and a turning water chamber, the water inlet chamber and the water outlet chamber are communicated with the heat exchange units on one side of the shell, and the turning water chamber is communicated with the heat exchange units on the other side of the shell.

[0015] Further, the water inlet chamber, the water outlet chamber and the turning water chamber are symmetrically arranged on the two sides of the shell, forming a double-flow heat exchange channel of cooling water.

[0016] Further, a vertical gap is arranged between the limit support no. 1 and the hot well bottom plate, and the gap height is greater than the vertical thermal expansion amount of the condenser.

[0017] Further, the shell is internally provided with a heat exchange tube bundle, and the hot well bottom is provided with a water outlet device connected with an external condensate water pipeline.

[0018] Therefore, by means of the technical scheme, the utility model has the beneficial effects that:

[0019] The utility model solves the key technical problems of the traditional lateral steam exhaust condenser through structural innovation:

[0020] Vacuum thrust balance and cost optimization: rigid welding is used in the throat and the low-pressure cylinder instead of the expansion joint, the horizontal thrust generated by the vacuum inside the condenser is directly offset by the rigid structure, the low-pressure cylinder is prevented from bearing hundreds of tons of additional load, the equipment cost increase and the leakage risk caused by the expansion joint are eliminated, the system structure is simplified, and the operation safety is improved.

[0021] Thermal expansion coordination and load control: the high-position sliding support is arranged to make the condenser support plane and the low-pressure cylinder support plane have the same elevation, the vertical thermal expansion difference is significantly reduced, the low-friction coefficient material layer is matched, the condenser can freely slide, the interface bending moment and shear force caused by inconsistent expansion are reduced, and the equipment life is prolonged.

[0022] Drainage system reliability improvement: the hot well adopts a sinking suspension design, the bottom elevation is lower than all the drainage points of the steam turbine system, gravity flow from the drainage expansion vessel to the hot well is realized, the equipment such as the drainage pump is completely saved, the steam turbine water inlet hidden danger caused by pump body failure is avoided, the pipeline arrangement is simplified, and the safety of the drainage system is greatly improved.

[0023] Expansion guidance and stability guarantee: the fixed support is used as a common dead point, and the limiting support forms a normal direction guide rail, the condenser and the low-pressure cylinder reversely expand with the dead point as the center, the expansion displacement is ensured to be uniform and controllable, additional load caused by the difference in torsion angle is avoided, and the overall operation stability of the unit is improved.

[0024] The above-mentioned structure synergistically reduces the cost and simplifies the system, fundamentally solves the problems of vacuum thrust balance, thermal expansion coordination, and drainage reliability, and is suitable for the low-position arrangement requirement of high-power combined cycle units. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 The utility model structural schematic view,

[0026] Fig. 2 The utility model side view,

[0027] Fig. 3 The utility model support assembly layout schematic view.

[0028] Markings in the figure: 1 - shell, 2 - throat, 3 - water outlet chamber, 4 - water inlet chamber, 5 - hot well, 6 - water outlet device, 7 - sliding support, 8 - limiting support one, 9 - fixed support, 10 - turning water chamber, 11 - limiting support two. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings.

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0031] In this embodiment, as Figs. 1-3 As shown, a lateral exhaust condenser rigidly connected to a low-pressure cylinder includes a throat 2, a shell 1, a hot well 5, and a support assembly. One end of the throat 2 is directly connected to the exhaust port of the low-pressure cylinder by rigid welding, and the shell 1 is connected to the other end of the throat 2. The hot well 5 is suspended at the bottom of the shell 1 in a sunken position. The support assembly includes a fixed support 9, a sliding support 7, a first limiting support 8, and a second limiting support 11. The fixed support 9 is located at the bottom of the throat 2 and supports the throat 2 and part of the weight of the low-pressure cylinder. The sliding support 7 is located at the bottom of the shell 1. The first limiting support 8 is located at the bottom of the hot well 5, and the second limiting support 11 is located at the bottom of the throat 2.

[0032] The left end of the throat 2 is directly connected to the exhaust port of the low-pressure cylinder by rigid welding, forming an integral structure without expansion joint; the right end is welded to the shell 1, serving as a channel for steam to enter the condenser from the low-pressure cylinder.

[0033] The hot well 5 is sunken and fixed to the bottom of the shell 1 by a suspension bracket. Its top opening is connected to the inside of the shell 1 to collect condensate.

[0034] The support assembly includes:

[0035] Fixed support 9: Welded to the center of the bottom of the throat 2, the bottom surface is fixed to the turbine operating layer foundation, supports the weight of the throat 2 and part of the low-pressure cylinder, and serves as the expansion dead point of the condenser and the low-pressure cylinder.

[0036] Sliding support 7: evenly distributed at the bottom edge of the shell 1, with the upper surface of the support in contact with the bottom surface of the shell 1 and the lower surface fixed to the foundation.

[0037] Limiting support 18: Located on both sides of the bottom of the hot well 5, extending along the turbine axis (Y direction);

[0038] Limiting support 2 11: It is set on both sides of the bottom of the throat 2 and extends radially (X direction) along the turbine.

[0039] The rigid connection of the throat 2 and the low-pressure cylinder eliminates the expansion joint, and the horizontal thrust generated by the internal vacuum of the condenser is directly transmitted to the low-pressure cylinder through the rigid structure, the vacuum thrusts of the two cancel each other out, and the additional load caused by the traditional expansion joint is avoided. In the support assembly, the fixed support 9 serves as a common dead point, the condenser expands in the +Y direction with the dead point as the center, and the low-pressure cylinder expands in the -Y direction, the limiting supports 1 and 2 limit the X and Y direction movements and guide the sliding, which ensures the coordinated expansion of the two and reduces the interface stress.

[0040] Further, the throat 2 is arranged obliquely, so that the center line of the steam turbine exhaust is higher than the center line of the shell 1 after installation.

[0041] The throat 2 is arranged obliquely, and the axis of the throat 2 forms an angle of 5°-15° with the horizontal plane (the specific angle is designed according to the position of the steam turbine exhaust port), so that the center line of the steam turbine exhaust is higher than the center line of the shell 1.

[0042] The left end of the throat 2 is horizontally connected with the low-pressure cylinder exhaust port, and the right end is inclined downward and welded with the top of the shell 1, forming a gradually expanding channel.

[0043] The oblique arrangement makes the steam discharged by the low-pressure cylinder not need to fall vertically, but flow smoothly into the shell 1 along the inclined direction of the throat 2, reducing the steam flow resistance and pressure drop. At the same time, the center line of the shell 1 is lower than the center line of the steam turbine exhaust, and the sinking design of the hot well 5 creates a height difference condition for the self-flow of the drain water, ensuring the smooth flow of the drain water.

[0044] Further, the fixed support 9 is the common dead point of the condenser and the low-pressure cylinder, the arrangement height of the sliding support 7 is consistent with the support plane height of the low-pressure cylinder, and a low-friction coefficient material layer is arranged on the contact surface between the sliding support 7 and the bottom of the shell 1.

[0045] The fixed support 9 is welded to the bottom center of the throat 2, and a boss is arranged on the top surface of the fixed support 9, which cooperates with the groove at the bottom of the low-pressure cylinder exhaust port to form the common dead point of the condenser and the low-pressure cylinder, and the two expand reversely with the dead point as the center.

[0046] The arrangement height of the sliding support 7 is consistent with the support plane height of the low-pressure cylinder, and a low-friction coefficient material layer is pasted on the upper surface of the sliding support 7.

[0047] The high arrangement of the sliding support 7 makes the support plane of the condenser shell 1 basically level with the support plane of the low-pressure cylinder, significantly reducing the vertical thermal expansion difference between the two, avoiding the interface bending moment caused by the height difference. The low-friction coefficient material layer allows the shell 1 to slide freely in the horizontal direction while bearing the weight of the condenser, ensuring that there is no jamming during expansion and reducing the additional load.

[0048] Further, the bottom of the hot well 5 is lower than the height of all drain points of the steam turbine system, and the hot well 5 is fixedly connected with the bottom of the shell 1 through a suspension structure.

[0049] The hot well 5 is fixed to the bottom of the casing 1 by a U-shaped suspension beam, the beam body is welded to the bottom surface of the casing 1 at both ends, and the flange at the top of the hot well 5 is bolted to the lower end of the suspension beam, so that the hot well 5 is suspended as a whole below the casing 1.

[0050] The bottom elevation of the hot well 5 is lower than the elevations of all the drain points (such as the low-pressure cylinder drain hole and the drain valve outlet) of the steam turbine system.

[0051] The sinking suspension structure makes the bottom of the hot well 5 the lowest point of the entire drain system, and the condensed water discharged from the drain expansion vessel can flow to the hot well 5 by gravity without pumping, thereby eliminating the need for a drain pump and related pipelines, simplifying the system and improving reliability. The suspension connection mode allows the hot well 5 to expand freely with the casing 1 while bearing its own weight.

[0052] Further, the limiting support one 8 includes a guide rail extending in the axial direction of the steam turbine for limiting the axial movement of the condenser and guiding the axial sliding of the condenser; and the limiting support two 11 includes a guide rail extending in the radial direction of the steam turbine for limiting the radial movement of the condenser and guiding the radial sliding of the condenser.

[0053] The limiting support one 8 is two parallel T-shaped rails fixed to the bottom foundation of the hot well 5 in the axial direction (Y direction) of the steam turbine, and the rails cooperate with the sliding blocks at the bottom of the hot well 5 to allow the condenser to slide in the Y direction and limit the movement in the X direction.

[0054] The limiting support two 11 is two parallel L-shaped rails fixed to the bottom foundation of the throat 2 in the radial direction (X direction) of the steam turbine, and the rails cooperate with the guide blocks at the bottom of the throat 2 to allow the condenser to slide in the X direction and limit the movement in the Y direction.

[0055] The limiting support one and the limiting support two form an orthogonal guide system, the limiting support one 8 ensures the expansion sliding of the condenser in the exhaust direction (Y direction) and avoids radial deviation, and the limiting support two 11 limits the axial movement and ensures the accuracy of the expansion direction. The cooperation of the two allows the expansion displacement of the condenser to be only in the predetermined direction, preventing structural stress caused by out-of-control freedom.

[0056] Further, the intersection of the guide rails of the limiting support one 8 and the guide rails of the limiting support two 11 coincides with the position of the fixed support 9, forming the expansion dead point of the condenser.

[0057] The intersection of the Y-direction guide rails of the limiting support one 8 and the X-direction guide rails of the limiting support two 11 in the horizontal plane completely coincides with the center position of the fixed support 9, forming the expansion dead point of the condenser.

[0058] The setting of the expansion dead point makes the condenser center on the fixed support 9, and the expansion displacement in the X and Y directions is taken as the origin, which ensures the symmetric and uniform expansion deformation of the shell 1 and the throat 2, and avoids the distortion stress caused by the offset of the dead point. The track intersection point coincides with the dead point, which ensures that the sliding degrees of the condenser in two orthogonal directions are independent and coordinated, and improves the overall stability.

[0059] Further, the shell 1 is provided with a water inlet chamber 4, a water outlet chamber 3 and a diversion water chamber 10 on both sides, respectively. The water inlet chamber 4 and the water outlet chamber 3 are communicated with the heat exchange unit on one side of the shell 1, and the diversion water chamber 10 is communicated with the heat exchange unit on the other side of the shell 1.

[0060] The heat exchange unit is provided with a tube bundle inside, and the cooling water enters the left tube bundle from the water inlet chamber 4, flows into the right tube bundle through the diversion water chamber 10 after heat exchange, and is finally discharged from the water outlet chamber 3.

[0061] The double-chamber layout forms double-flow heat exchange of the cooling water, prolongs the residence time of the cooling water in the shell 1, and improves the heat exchange efficiency. The water flow path is symmetrical, which reduces the flow resistance, and facilitates pipeline connection and maintenance.

[0062] Further, the water inlet chamber 4, the water outlet chamber 3 and the diversion water chamber 10 are symmetrically arranged on both sides of the shell 1 to form a cooling water double-flow heat exchange channel.

[0063] The symmetrical arrangement makes the flow resistance of the cooling water uniform, avoids the deflection phenomenon, and improves the utilization rate of the heat exchange tube bundle. The double-flow design doubles the heat exchange area without increasing the length of the shell 1, which is compact and suitable for low-position arrangement scenes with limited space.

[0064] Further, a vertical gap is provided between the limiting support 8 and the bottom plate of the hot well 5, and the gap height is greater than the vertical thermal expansion amount of the condenser.

[0065] The vertical gap between the track top surface of the limiting support 8 and the bottom plate of the hot well 5 is 5-10mm, and the gap height is greater than the vertical thermal expansion amount of the condenser under the rated working condition.

[0066] The vertical gap allows the hot well 5 to freely expand in the vertical direction with the shell 1, avoids the limitation of the limiting support 8 on the thermal deformation of the condenser, and prevents additional bending moments caused by blocked expansion. At the same time, the horizontal guide rail ensures that the hot well 5 only slides in the Y direction, without affecting the limiting function.

[0067] Further, the shell 1 is provided with a heat exchange tube bundle inside, and the hot well 5 is provided with a water outlet device 6 connected with the external condensate water pipeline at the bottom.

[0068] The shell 1 is internally arranged with multiple groups of heat exchange tube bundles, the two ends of the tube bundles are fixed to the tube plates of the water inlet chamber 4 and the diversion water chamber 10 respectively, and a cooling water channel is formed; steam enters the shell 1 from the throat 2 and is condensed into water outside the tube bundles, and then drops to the lower hot well 5.

[0069] A water outlet device 6 is arranged at the bottom center of the hot well 5 and includes a flange-connected drain pipe, which is communicated with an external condensate water pipeline and conveys the condensate water to a subsequent system.

[0070] The dense arrangement of the heat exchange tube bundles enlarges the contact area of the steam and the cooling water and improves the condensation efficiency. The water outlet device 6 is located at the lowest point of the hot well 5, ensuring that the condensate water is discharged without being retained. The sinking design of the suspension type hot well 5 provides sufficient installation space for the water outlet pipeline and avoids poor drainage caused by the climbing of the pipeline.

[0071] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A side-exhaust condenser rigidly connected to a low-pressure cylinder, characterized in that: It includes a throat (2), a shell (1), a hot well (5), and a support assembly; one end of the throat (2) is directly connected to the exhaust port of the low-pressure cylinder by rigid welding, the shell (1) is connected to the other end of the throat (2), and the hot well (5) is suspended at the bottom of the shell (1) in a sunken position; the support assembly includes a fixed support (9), a sliding support (7), a first limiting support (8), and a second limiting support (11). The fixed support (9) is located at the bottom of the throat (2) and supports the weight of the throat (2) and part of the low-pressure cylinder. The sliding support (7) is located at the bottom of the shell (1). The first limiting support (8) is located at the bottom of the hot well (5), and the second limiting support (11) is located at the bottom of the throat (2).

2. The side-exhaust condenser rigidly connected to the low-pressure cylinder according to claim 1, characterized in that, The throat (2) is arranged obliquely, so that after installation the turbine exhaust centerline is higher than the shell (1) centerline.

3. A side-exhaust condenser rigidly connected to a low-pressure cylinder according to claim 1, characterized in that, The fixed support (9) is the common dead point of the condenser and the low-pressure cylinder. The elevation of the sliding support (7) is consistent with the elevation of the low-pressure cylinder support plane. The sliding support (7) and the bottom contact surface of the shell (1) are provided with a low friction coefficient material layer.

4. A side-exhaust condenser rigidly connected to a low-pressure cylinder according to claim 1, characterized in that, The bottom elevation of the hot well (5) is lower than the elevation of all drainage points of the turbine system. The hot well (5) is fixedly connected to the bottom of the shell (1) through a suspension structure.

5. A side-exhaust condenser rigidly connected to a low-pressure cylinder according to claim 1, characterized in that, The first limiting support (8) includes a guide rail extending along the turbine axial direction to limit the condenser's radial movement in the turbine and guide the turbine to slide in the turbine axial direction; the second limiting support (11) includes a guide rail extending along the turbine radial direction to limit the condenser's radial movement in the turbine axial direction and guide the turbine to slide in the turbine radial direction.

6. A side-exhaust condenser rigidly connected to a low-pressure cylinder according to claim 1, characterized in that, The intersection of the guide rail of the limiting support one (8) and the guide rail of the limiting support two (11) coincides with the position of the fixed support (9), forming the expansion dead point of the condenser.

7. A side-exhaust condenser rigidly connected to a low-pressure cylinder according to claim 1, characterized in that, The shell (1) is provided with an inlet chamber (4), an outlet chamber (3) and a turning chamber (10) on both sides respectively. The inlet chamber (4) and the outlet chamber (3) are connected to the heat exchange unit on one side of the shell (1), and the turning chamber (10) is connected to the heat exchange unit on the other side of the shell (1).

8. A side-exhaust condenser rigidly connected to a low-pressure cylinder according to claim 7, characterized in that, The inlet chamber (4), outlet chamber (3) and turning chamber (10) are symmetrically arranged on both sides of the shell (1) to form a dual-flow heat exchange channel for cooling water.

9. A side-exhaust condenser rigidly connected to a low-pressure cylinder according to claim 1, characterized in that, A vertical gap is provided between the limiting support (8) and the bottom plate of the hot well (5), and the height of the gap is greater than the vertical thermal expansion of the condenser.

10. A side-exhaust condenser rigidly connected to a low-pressure cylinder according to claim 1, characterized in that, The shell (1) is equipped with a heat exchange tube bundle inside, and the bottom of the hot well (5) is equipped with a water outlet device (6) connected to an external condensate pipe.

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