A high-pressure steam branch pipe pressure loss protection device

Abstract

The application discloses a high-pressure steam branch pipeline pressure loss protection device, which comprises a pipeline pressure loss flow breaker and a bypass pipeline. When an accident occurs in the high-pressure steam branch pipeline and steam leakage occurs, the steam flow rate in the high-pressure steam branch pipeline increases, the over-flow passage is in a closed state, the high-temperature and high-pressure steam in the main high-pressure steam pipeline no longer flows into the high-pressure steam branch pipeline, the influence on the main high-pressure steam pipeline is reduced, the influence on the steam turbine unit is eliminated, and a large accident of a power generation system caused by steam leakage is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-temperature and high-pressure steam transmission and its peripheral supporting facilities, in particular to a high-pressure steam branch pipeline pressure loss protection device. BACKGROUND

[0002] At present, in the thermal power generation system of China, the steam turbine unit is almost subcritical or even supercritical, so the high-temperature steam pressure output by the boiler is above 15 MPa, even reaching 25-27 MPa. Due to the rise of new energy power systems, the thermal power system faces the demand for peak shaving, and among various peak shaving technical means, steam extraction peak shaving is the most economical one. However, due to the lack of a valve installed on the branch pipeline of the main steam pipeline of the boiler, which can be quickly closed when the branch pipeline loses pressure, when the main steam pipeline is T-connected with the branch pipeline for steam extraction peak shaving, if an accident occurs in the steam extraction branch pipeline and steam leaks in large quantities, the passage cannot be closed in time, which will have a great impact on the main steam pipeline, and further affect the steam turbine unit, and easily form a power generation system accident, and further affect the connection of the steam extraction heat storage equipment. SUMMARY

[0003] The purpose of the present application is to provide a high-pressure steam branch pipeline pressure loss protection device to solve the problems existing in the prior art, which can close the passage in time when an accident occurs in the high-pressure steam branch pipeline and steam leaks in large quantities, avoid the loss of pressure of the main steam pipeline, prevent the shutdown accident of the steam turbine unit, ensure the operation safety factor of the thermal power generation system, and realize the safety and reliability when the main steam pipeline is connected with the steam extraction heat storage equipment.

[0004] To achieve the above purpose, the present application provides the following scheme: the present application provides a high-pressure steam branch pipeline pressure loss protection device, which comprises:

[0005] A pipeline pressure loss flow interrupter is arranged on the high-pressure steam branch pipeline, and the pipeline pressure loss flow interrupter comprises a flow interrupter shell and a closing partition plate, the flow interrupter shell has a flow passage therein, the flow passage has a flow inlet and a flow outlet, and the closing partition plate is slidably arranged in the flow passage and located between the flow inlet and the flow outlet;

[0006] In the direction from the flow inlet to the flow outlet, the flow passage has a first position and a second position, when the closing partition plate is located at the first position, the flow inlet and the flow outlet are in communication, and the flow passage is in an open state; when the closing partition plate is located at the second position, the closing partition plate blocks the flow outlet, and the flow passage is in a closed state; when the closing partition plate is located between the first position and the second position, the flow inlet and the flow outlet are in communication, and the flow passage is in a throttling state.

[0007] A bypass pipeline is provided in parallel with the pipeline pressure relief device, and a bypass starting valve is arranged on the bypass pipeline.

[0008] Preferably, a first elastic member is arranged between the shutoff partition plate and the overflow outlet, one end of the first elastic member is connected with the shutoff partition plate, and the other end of the first elastic member is connected with the inner wall of the relief device shell.

[0009] Preferably, a limiting support is arranged in the overflow passage, the limiting support is arranged on the side of the shutoff partition plate close to the overflow inlet, and when the shutoff partition plate abuts against the limiting support, the overflow passage is in an open state.

[0010] Preferably, a second elastic member is arranged between the shutoff partition plate and the overflow inlet, one end of the second elastic member is connected with the shutoff partition plate, and the other end of the second elastic member is connected with the inner wall of the relief device shell.

[0011] Preferably, along the direction from the overflow inlet to the overflow outlet, the overflow passage has a working section and a throttling section connected in sequence, and along the direction from the overflow inlet to the overflow outlet, the radial cross-sectional area of the throttling section gradually decreases, one end of the working section is connected with the overflow inlet, the other end of the working section is connected with the end of the throttling section with a larger radial cross-sectional area, the end of the throttling section with a smaller radial cross-sectional area is connected with the overflow outlet, the minimum radial cross-sectional area of the throttling section is larger than the radial cross-sectional area of the overflow outlet, the axial end face between the throttling section and the overflow outlet is a sealing face, when the shutoff partition plate abuts against the sealing face, the overflow passage is in a closed state, when the shutoff partition plate is located in the working section, the overflow passage is in an open state, and when the shutoff partition plate is located in the throttling section, the overflow passage is in a throttling state.

[0012] Preferably, the relief device shell comprises a relief device inlet pipe, a relief device body and a relief device outlet pipe connected in sequence to form the overflow passage, the inner diameter of the relief device inlet pipe is equal to the inner diameter of the relief device outlet pipe, and the working section and the throttling section are both located in the relief device body.

[0013] A sealing gasket is arranged on the side of the shutoff partition plate close to the overflow outlet, the sealing gasket is annular, and the sealing gasket can abut against the sealing face.

[0014] Preferably, the number of pipeline pressure relief devices is multiple groups, and all the pipeline pressure relief devices are arranged in series.

[0015] Preferably, the pipeline pressure-loss cutoff device further comprises a positioning mechanism, the positioning mechanism comprising a positioning bracket and a positioning shaft, the positioning bracket being arranged in the flow passage, the positioning bracket having flow-through holes allowing steam to pass through, the positioning shaft being coaxially arranged with the flow passage, the positioning shaft being connected with the cutoff partition, the positioning shaft being slidably connected with the positioning bracket, the sliding direction of the positioning shaft being parallel to the axial direction of the flow passage.

[0016] Preferably, the positioning bracket has a mounting hole, the positioning shaft being slidably arranged through the mounting hole, the flow-through holes being a plurality of holes, the flow-through holes being evenly distributed around the axis of the mounting hole.

[0017] The positioning bracket is in two groups, the two positioning brackets being respectively arranged on the two sides of the cutoff partition.

[0018] The present application has the following technical effects relative to the prior art:

[0019] The high-pressure steam branch pipe pressure loss protection device of the application, in operation, high-temperature and high-pressure steam flows into the high-pressure steam branch pipe from the main high-pressure steam pipe, the high-temperature and high-pressure steam enters the flow passage through the flow inlet, under the action of steam pressure, the closing partition plate moves towards the flow outlet direction until the closing partition plate reaches the second position and blocks the flow outlet, the flow passage is in a closed state; the bypass starting valve is opened, the high-temperature and high-pressure steam flows into the high-pressure steam branch pipe through the bypass pipe at a flow rate of 0.05 times the rated working flow rate of the branch pipe, at this time, the flow outlet direction is also gradually filled with high-pressure steam, when the steam pressure on one side of the flow outlet reaches a certain value, under the action of steam pressure, the closing partition plate moves towards the flow inlet direction, the high-temperature and high-pressure steam enters the high-pressure steam branch pipe from the flow passage, the flow passage is in a throttling state, with the movement of the closing partition plate to the first position, the flow passage is in an open state, at this time, the bypass starting valve is closed, and the pipe pressure loss interrupter is in a normal working state. When the high-pressure steam branch pipe in the flow outlet direction has an accident, such as steam leakage or pressure loss, the steam flow rate in the high-pressure steam branch pipe increases, a pressure difference appears on both sides of the closing partition plate, the pressure on the flow inlet direction is greater than that on the flow outlet direction, at the same time, the steam flow rate and flow rate on the flow inlet direction increase, the pressure acting on the closing partition plate increases, the closing partition plate moves towards the flow outlet direction, when the closing partition plate moves between the first position and the second position, the flow passage is in a throttling state, the cross-sectional area of the flow passage decreases, the steam flow rate continues to increase, the thrust of the steam pressure acting on the closing partition plate continues to increase, the movement of the closing partition plate is accelerated, finally, the closing partition plate reaches the second position to block the flow outlet, the flow passage is in a closed state, the high-temperature and high-pressure steam in the main high-pressure steam pipe no longer flows into the high-pressure steam branch pipe, the influence on the main high-pressure steam pipe is reduced, the influence on the steam turbine unit is eliminated, and a large accident of the power generation system caused by steam leakage is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below only show some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0021] Figure 1 The structure schematic diagram of the high-pressure steam branch pipe pressure loss protection device disclosed in the embodiments of the present application;

[0022] Figure 2 The structure schematic diagram of the pipe pressure loss interrupter of the high-pressure steam branch pipe pressure loss protection device disclosed in the embodiments of the present application;

[0023] Figure 3Structure schematic view of other embodiments of the pipeline pressure loss cut-off device of the high-pressure steam branch pipeline pressure loss protection device disclosed in the embodiments of the present application;

[0024] Figure 4 Structure schematic view of the positioning support of the high-pressure steam branch pipeline pressure loss protection device disclosed in the embodiments of the present application.

[0025] Wherein, 1 is the pipeline pressure loss cut-off device, 101 is the cut-off device shell, 102 is the cut-off partition, 103 is the overflow passage, 104 is the overflow inlet, 105 is the overflow outlet, 106 is the first elastic member, 107 is the limiting support column, 108 is the second elastic member, 109 is the working section, 110 is the throttling section, 111 is the sealing surface, 112 is the cut-off device inlet pipe, 113 is the cut-off device body, 114 is the cut-off device outlet pipe, 115 is the positioning support, 116 is the positioning shaft, 117 is the flow-through hole, 118 is the mounting hole, and 119 is the sealing gasket.

[0026] 2 is the main high-pressure steam pipeline;

[0027] 3 is the branch high-pressure steam input pipeline;

[0028] 4 is the branch high-pressure steam output pipeline;

[0029] 5 is the bypass pipeline;

[0030] 6 is the bypass starting valve;

[0031] 7 is the branch interface valve. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0033] The purpose of the present application is to provide a high-pressure steam branch pipeline pressure loss protection device to solve the problems in the prior art, which can timely cut off the passage when an accident occurs in the high-pressure steam branch pipeline and a large amount of steam leaks, reduce the influence on the main steam pipeline, eliminate the influence on the steam turbine unit, and improve the operation safety factor of the thermal power generation system.

[0034] In order to make the above purposes, characteristics and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0035] The application provides a high-pressure steam branch pipeline pressure loss protection device, which comprises a pipeline pressure loss flow breaker 1 and a bypass pipeline 5, the pipeline pressure loss flow breaker 1 is arranged on the high-pressure steam branch pipeline, the pipeline pressure loss flow breaker 1 comprises a flow breaker shell 101 and a shutoff partition plate 102, the flow breaker shell 101 is internally provided with a flow passage 103, the flow passage 103 is provided with a flow inlet 104 and a flow outlet 105, the shutoff partition plate 102 is slidably arranged in the flow passage 103 and located between the flow inlet 104 and the flow outlet 105; in the direction from the flow inlet 104 to the flow outlet 105, the flow passage 103 is provided with a first position and a second position, when the shutoff partition plate 102 is located at the first position, the flow inlet 104 and the flow outlet 105 are communicated, and the flow passage 103 is in an open state; when the shutoff partition plate 102 is located at the second position, the shutoff partition plate 102 blocks the flow outlet 105, and the flow passage 103 is in a closed state; when the shutoff partition plate 102 is located between the first position and the second position, the flow inlet 104 and the flow outlet 105 are communicated, and the flow passage 103 is in a throttling state; the bypass pipeline 5 is arranged in parallel with the pipeline pressure loss flow breaker 1, and the bypass pipeline 5 is provided with a bypass starting valve 6.

[0036] The high-pressure steam branch pipe pressure loss protection device of the application, when working, high-temperature and high-pressure steam flows into the high-pressure steam branch pipe from the main high-pressure steam pipe 2, the high-temperature and high-pressure steam enters the flow passage 103 through the flow inlet 104, under the action of steam pressure, the closing partition plate 102 moves towards the direction of the flow outlet 105 until it reaches the second position and blocks the flow outlet 105, and the flow passage 103 is in the closed state; the bypass starting valve 6 is opened, the high-temperature and high-pressure steam flows into the high-pressure steam branch pipe through the bypass pipe 5 at a flow rate of 0.05 times the rated working flow rate of the branch pipe, at this time the flow outlet 105 direction is also gradually filled with high-pressure steam, when the steam pressure on one side of the flow outlet 105 reaches a certain value, under the action of steam pressure, the closing partition plate 102 moves towards the flow inlet 104 direction, the high-temperature and high-pressure steam enters the high-pressure steam branch pipe from the flow passage 103, the flow passage 103 is in the throttling state, with the movement of the closing partition plate 102 to the first position, the flow passage 103 is in the open state, at this time the bypass starting valve 6 is closed, and the pipe pressure loss interrupter 1 is in the normal working state. When the high-pressure steam branch pipe in the flow outlet 105 direction has an accident, such as steam leakage and pressure loss, the steam flow rate in the high-pressure steam branch pipe increases, a pressure difference appears on both sides of the closing partition plate 102, the pressure on the flow inlet 104 direction is greater than that on the flow outlet 105 direction, at the same time, the steam flow rate and flow rate on the flow inlet 104 direction increase, the pressure acting on the closing partition plate 102 increases, the closing partition plate 102 moves towards the flow outlet 105 direction, when the closing partition plate 102 moves between the first position and the second position, the flow passage 103 is in the throttling state, the cross-sectional area of the flow passage 103 becomes smaller, the steam flow rate continues to increase, the steam pressure acting on the closing partition plate 102 continues to increase, the movement of the closing partition plate 102 is accelerated, and finally the closing partition plate 102 reaches the second position to block the flow outlet 105, the flow passage 103 is in the closed state, the high-temperature and high-pressure steam in the main high-pressure steam pipe 2 no longer flows into the high-pressure steam branch pipe, the influence on the main high-pressure steam pipe 2 is reduced, the influence on the steam turbine set is eliminated, and a large accident of the power generation system caused by steam leakage is avoided.

[0037] In the specific embodiment, the first elastic member 106 is arranged between the shutoff partition plate 102 and the overflow outlet 105, one end of the first elastic member 106 is connected with the shutoff partition plate 102, and the other end of the first elastic member 106 is connected with the inner wall of the flow breaker housing 101. After the bypass starting valve 6 is opened, the high-temperature and high-pressure steam flows into the high-pressure steam branch pipeline through the bypass pipeline 5 at a flow rate less than 0.05 times of the rated working flow rate of the branch pipeline, and when the high-pressure steam in the direction of the overflow outlet 105 is gradually filled with high-pressure steam, the steam pressure on the side of the overflow outlet 105 reaches a certain value, and under the combined action of the steam pressure and the elasticity of the first elastic member 106, the shutoff partition plate 102 moves towards the direction of the overflow inlet 104, the high-temperature and high-pressure steam enters the high-pressure steam branch pipeline through the overflow passage 103, and the overflow passage 103 is in a throttling state. With the shutoff partition plate 102 moving to the first position, the overflow passage 103 is in an open state, and at this time, the bypass starting valve 6 is closed, and the pipeline pressure relief flow breaker 1 is in a normal working state. When an accident occurs in the high-pressure steam branch pipeline in the direction of the overflow outlet 105, such as steam leakage or pressure loss, the steam flow rate in the high-pressure steam branch pipeline increases, and a pressure difference appears on both sides of the shutoff partition plate 102, the pressure in the direction of the overflow inlet 104 is greater than the pressure in the direction of the overflow outlet 105, and at the same time, the steam flow rate and flow rate in the direction of the overflow inlet 104 increase, and the thrust of the steam pressure acting on the shutoff partition plate 102 increases, until it is greater than the elastic force of the first elastic member 106, and the shutoff partition plate 102 moves towards the direction of the overflow outlet 105. When the shutoff partition plate 102 moves to a position between the first position and the second position, the overflow passage 103 is in a throttling state, the cross-sectional area of the overflow passage 103 becomes smaller, the steam flow rate continues to increase, the thrust of the steam pressure acting on the shutoff partition plate 102 continues to increase, the movement of the shutoff partition plate 102 is accelerated, and finally the shutoff partition plate 102 reaches the second position to block the overflow outlet 105, and the overflow passage 103 is in a closed state.

[0038] When the shutoff partition plate 102 moves to the overflow inlet 104, in order to avoid that the shutoff partition plate 102 blocks the overflow inlet 104, the present application is provided with a limiting support 107 in the overflow passage 103, the limiting support 107 is arranged on the side of the shutoff partition plate 102 close to the overflow inlet 104, and when the shutoff partition plate 102 abuts against the limiting support 107, the overflow passage 103 is in an open state. The limiting support 107 limits the extreme movement position of the shutoff partition plate 102, and improves the working reliability of the pipeline pressure relief flow breaker 1. In actual application, multiple limiting supports 107 can be arranged to improve the stress uniformity of the shutoff partition plate 102, and a limiting ring can also be arranged on the limiting support 107 to increase the contact area of the limiting support 107 and the shutoff partition plate 102, and further improve the limiting stability and reliability.

[0039] In other specific embodiments of the present application, a second elastic member 108 can also be arranged between the shutoff partition plate 102 and the over-flow inlet 104, one end of the second elastic member 108 being connected to the shutoff partition plate 102, and the other end of the second elastic member 108 being connected to the inner wall of the shutoff housing 101. When the over-flow passage 103 is open, the over-flow outlet 105 direction is also gradually filled with high-pressure steam, and the steam thrust in the over-flow inlet 104 direction and the elastic force of the second elastic member 108 jointly act on the shutoff partition plate 102, and are balanced with the force of the steam thrust in the over-flow outlet 105 direction and the elastic force of the first spring acting on the shutoff partition plate 102, so that the shutoff partition plate 102 stays in the first position, the steam flow passage cross-sectional area of the over-flow passage 103 is maximum, the bypass starting valve 6 is closed, and the pipeline pressure relief trip device 1 is in a normal working state. When the high-pressure steam branch pipeline in the over-flow outlet 105 direction has an accident, such as steam leakage or pressure loss, the steam flow rate in the high-pressure steam branch pipeline increases, and a pressure difference appears on both sides of the shutoff partition plate 102, the pressure in the over-flow inlet 104 direction is greater than the pressure in the over-flow outlet 105 direction, and at the same time, the steam flow rate and flow rate in the over-flow inlet 104 direction increase, the pressure acting on the shutoff partition plate 102 increases, and the shutoff partition plate 102 moves towards the over-flow outlet 105 direction. When the shutoff partition plate 102 moves between the first position and the second position, the over-flow passage 103 is in a throttling state, the cross-sectional area of the over-flow passage 103 becomes smaller, so that the steam flow rate continues to increase, the steam pressure acting on the shutoff partition plate 102 continues to increase, the movement of the shutoff partition plate 102 is accelerated, and the shutoff response speed of the pipeline pressure relief trip device 1 is further improved due to the action of the second elastic member 108. Finally, the shutoff partition plate 102 reaches the second position to block the over-flow outlet 105, and the over-flow passage 103 is in a closed state. The arrangement of the second elastic member 108 can avoid the shutoff partition plate 102 from blocking the over-flow inlet 104, and in actual application, the second elastic member 108 or the limiting support 107 can be selected according to actual needs, so as to reduce the processing and manufacturing difficulty of the pipeline pressure relief trip device 1 and improve the flexible adaptability of the device. The first elastic member 106 and the second elastic member 108 can both be springs, which are inexpensive and easy to obtain.

[0040] Specifically, along the direction from the overflow inlet 104 to the overflow outlet 105, the overflow channel 103 has a working section 109 and a throttling section 110 that are sequentially connected, and along the direction from the overflow inlet 104 to the overflow outlet 105, the radial cross-sectional area of ​​the throttling section 110 gradually decreases, one end of the working section 109 is connected to the overflow inlet 104, the other end of the working section 109 is connected to the end with a larger radial cross-sectional area of ​​the throttling section 110, and the end with a smaller radial cross-sectional area of ​​the throttling section 110 is connected to the overflow inlet 104. The outlet 105 is connected, the minimum radial cross-sectional area of ​​the throttling section 110 is larger than the radial cross-sectional area of ​​the excess flow outlet 105, the axial end surface between the throttling section 110 and the excess flow outlet 105 is a sealing surface 111, and when the shut-off partition 102 is against the sealing surface 111, the excess flow channel 103 is in a closed state; when the shut-off partition 102 is located in the working section 109, the excess flow channel 103 is in an open state; when the shut-off partition 102 is located in the throttling section 110, the excess flow channel 103 is in a throttling state. When the shut-off partition 102 is located in the working section 109, the cross-sectional area of ​​the steam flow channel of the flow channel 103 is the largest. When the shut-off partition 102 is located in the throttling section 110, the cross-sectional area of ​​the steam flow channel of the flow channel 103 gradually becomes smaller to achieve throttling. When the shut-off partition 102 abuts the axial end face of the flow outlet 105, the steam flow channel of the flow channel 103 is blocked and the flow channel 103 is closed.

[0041] More specifically, the breaker housing 101 adopts a split structure. The breaker housing 101 includes a breaker inlet pipe 112, a breaker body 113 and a breaker outlet pipe 114 in sequence. The three are connected to form a flow channel 103. The inner diameter of the breaker inlet pipe 112 is equal to the inner diameter of the breaker outlet pipe 114. The working section 109 and the throttling section 110 are both located in the breaker body 113, which further reduces the difficulty of assembling and manufacturing the pipeline pressure-loss breaker 1 and is conducive to improving the adaptability of the device.

[0042] In order to ensure that the shut-off partition 102 can block the flow outlet 105, a sealing gasket 119 is provided on the side of the shut-off partition 102 close to the flow outlet 105. The sealing gasket 119 is annular and can be abutted against the sealing surface 111 to improve the closing reliability.

[0043] It should also be emphasized that in actual applications, the number of pipeline pressure loss interrupters 1 can be set to multiple groups, and all pipeline pressure loss interrupters 1 are set in series to meet different working conditions and further improve system operation safety.

[0044] In order to improve the reliability of the reciprocating motion of the closing partition plate 102, the pipeline pressure loss cut-off device 1 further comprises a positioning mechanism, the positioning mechanism comprises a positioning support 115 and a positioning shaft 116, the positioning support 115 is arranged in the flow passage 103, the positioning support 115 is provided with flow holes 117 allowing steam to pass through, the positioning shaft 116 is coaxially arranged with the flow passage 103, the positioning shaft 116 is connected with the closing partition plate 102, the positioning shaft 116 is slidably connected with the positioning support 115, the sliding direction of the positioning shaft 116 is parallel to the axial direction of the flow passage 103, and the positioning shaft 116 is slidably connected with the positioning support 115 in the axial direction, so as to ensure that the closing partition plate 102 reciprocates along the axis of the flow passage 103 and avoid mispositioning of the closing partition plate 102 to affect the normal work of the pipeline pressure loss cut-off device 1.

[0045] In addition, the positioning support 115 is provided with mounting holes 118, the positioning shaft 116 is slidably arranged through the mounting holes 118, the flow holes 117 are a plurality of flow holes, and the flow holes 117 are uniformly distributed in the circumferential direction of the axis of the mounting holes 118, so as to improve the uniformity of the steam passing through; in actual application, the positioning support 115 can be arranged in two groups, and the two positioning supports 115 are arranged on the two sides of the closing partition plate 102, so as to further improve the reciprocating accuracy of the closing partition plate 102.

[0046] In actual application, the steam generator is connected with the steam turbine unit by using a steam conveying mechanism, the steam conveying mechanism comprises the main high-pressure steam pipeline 2 and a high-pressure steam branch pipeline, the high-pressure steam branch pipeline is provided with the high-pressure steam branch pipeline pressure loss protection device, the main high-pressure steam pipeline 2 is connected with the high-pressure steam branch pipeline by using the branch interface valve 7, wherein the high-pressure steam branch pipeline comprises a branch high-pressure steam input pipeline 3 and a branch high-pressure steam output pipeline 4, the high-pressure steam branch pipeline pressure loss protection device of the present application is arranged between the branch high-pressure steam input pipeline 3 and the branch high-pressure steam output pipeline 4, and in actual application, the length of the branch high-pressure steam input pipeline 3 should be as short as possible.

[0047] The high-pressure steam branch pipeline pressure loss protection device of the present application is connected in series on the T-junction high-pressure steam branch pipeline and is as close to the T-junction as possible. When an accident occurs in the steam extraction branch and a large amount of steam leaks, the passage can be closed in time, the influence on the main high-pressure steam pipeline 2 is reduced, the influence on the steam turbine unit is eliminated, and a large accident of the power generation system caused by steam leakage is avoided. The high-pressure steam branch pipeline pressure loss protection device of the present application is a pure mechanical mechanism, which is different from the ordinary valve controlled by a traditional electric valve or electromagnetic valve, has slow closing action and is prone to failure due to external conditions. The high-pressure steam branch pipeline pressure loss protection device of the present application has higher reliability and faster closing response speed as a pressure loss protection means.

[0048] The principles and implementation manners of the present application are described by using specific examples in the present application, and the above examples are only used for helping to understand the method of the present application and its core idea; meanwhile, for the general technical personnel in the art, according to the idea of the present application, the specific implementation manners and application ranges will be changed. In conclusion, the content of the present specification should not be understood as the limitation of the present application.

Claims

1. A high-pressure steam branch pipeline pressure loss protection device, characterized in that: include: A pipeline pressure-loss cutout, the pipeline pressure-loss cutout being arranged on a high-pressure steam branch pipeline, comprising a cutout housing and a shutoff baffle, the cutout housing having a flow passage therein, the flow passage having a flow inlet and a flow outlet, the shutoff baffle being slidably arranged within the flow passage and being located between the flow inlet and the flow outlet; Along the direction from the overflow inlet to the overflow outlet, the overflow channel has a first position and a second position. When the shut-off partition is in the first position, the overflow inlet is connected to the overflow outlet, and the overflow channel is in an open state. When the shut-off partition is in the second position, the shut-off partition blocks the flow outlet, and the flow channel is in a closed state; when the shut-off partition is between the first position and the second position, the flow inlet is connected to the flow outlet, and the flow channel is in a throttling state; A bypass pipeline, the bypass pipeline is arranged in parallel with the pipeline pressure-loss cutout, and a bypass start valve is provided on the bypass pipeline; A first elastic member is provided between the shutoff partition and the flow outlet, one end of the first elastic member is connected to the shutoff partition, and the other end of the first elastic member is connected to the inner wall of the interrupter housing; Along the direction from the overflow inlet to the overflow outlet, the overflow channel has a working section and a throttling section that are connected in sequence, and along the direction from the overflow inlet to the overflow outlet, the radial cross-sectional area of ​​the throttling section gradually decreases, one end of the working section is connected to the overflow inlet, the other end of the working section is connected to the end with a larger radial cross-sectional area of ​​the throttling section, and the end with a smaller radial cross-sectional area of ​​the throttling section is connected to the overflow outlet, the minimum radial cross-sectional area of ​​the throttling section is greater than the radial cross-sectional area of ​​the overflow outlet, the axial end surface between the throttling section and the overflow outlet is a sealing surface, when the shut-off partition is against the sealing surface, the overflow channel is in a closed state, when the shut-off partition is located in the working section, the overflow channel is in an open state, and when the shut-off partition is located in the throttling section, the overflow channel is in a throttling state.

2. The high-pressure steam branch pipeline pressure loss protection device according to claim 1, characterized in that: A limiting pillar is provided in the flow passage, and the limiting pillar is provided on a side of the shut-off partition close to the flow inlet. When the shut-off partition abuts against the limiting pillar, the flow passage is in an open state.

3. The high-pressure steam branch pipeline pressure loss protection device according to claim 1, characterized in that: A second elastic member is provided between the shutoff partition and the overflow inlet, one end of the second elastic member is connected to the shutoff partition, and the other end of the second elastic member is connected to the inner wall of the interrupter housing.

4. The high-pressure steam branch pipeline pressure loss protection device according to claim 1, characterized in that: The breaker housing includes a breaker inlet pipe, a breaker body, and a breaker outlet pipe in sequence, which are connected to form the flow passage. The inner diameter of the breaker inlet pipe is equal to the inner diameter of the breaker outlet pipe. The working section and the throttling section are both located in the breaker body. A sealing gasket is provided on one side of the shut-off partition close to the overflow outlet. The sealing gasket is annular and can abut against the sealing surface.

5. The high-pressure steam branch pipeline pressure loss protection device according to any one of claims 1 to 4, characterized in that: The number of the pipeline pressure-loss cutouts is multiple groups, and all of the pipeline pressure-loss cutouts are arranged in series.

6. The high-pressure steam branch pipeline pressure loss protection device according to any one of claims 1 to 4, characterized in that: The pipeline pressure-loss interrupter also includes a positioning mechanism, which includes a positioning bracket and a positioning shaft. The positioning bracket is arranged in the flow channel, and the positioning bracket has a flow hole allowing steam to pass through. The positioning shaft is coaxially arranged with the flow channel, and the positioning shaft is connected to the shut-off partition. The positioning shaft is slidably connected to the positioning bracket, and the sliding direction of the positioning shaft is parallel to the axial direction of the flow channel.

7. The high-pressure steam branch pipeline pressure loss protection device according to claim 6, characterized in that: The positioning bracket has a mounting hole, the positioning shaft can slide through the mounting hole, the number of the circulation holes is multiple, and the circulation holes are evenly distributed around the axis of the mounting hole; The number of the positioning brackets is two groups, and the two positioning brackets are respectively located on both sides of the shut-off partition.

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