Auxiliary steam distribution device and method for full-stroke activity test of high-pressure steam valve of steam turbine

Abstract

The invention provides a steam turbine high-pressure valve full-stroke activity test auxiliary steam distribution device and method, and relates to the technical field of thermal power generation. The device comprises a first main pipeline assembly, a second main pipeline assembly and a connection pipeline assembly. A fluid passage is arranged between the first main pipeline assembly and the second main pipeline assembly, and the fluid passage is connected or disconnected through the connecting pipeline assembly; under the communication state of the fluid passage, main steam conveyed from the first main pipeline assembly can enter the second main pipeline assembly after being shunted by the connection pipeline assembly, and then flows into the high-pressure cylinder; or the main steam conveyed from the second main pipeline assembly can enter the first main pipeline assembly after being shunted by the connection pipeline assembly, and then flows into the high-pressure cylinder. According to the device and the method, the problem of overlarge vibration caused by steam flow excitation of a high-pressure cylinder rotor due to non-uniform steam admission caused by the fact that main steam enters from a control valve on one side of the high-pressure cylinder in a high-pressure valve full-stroke activity test process in the prior art is solved.

Description

Technical Field

[0001] The invention relates to the technical field of thermal power generation, in particular to an auxiliary steam distribution device for a full-stroke activity test of a high-pressure steam valve of a steam turbine and an auxiliary steam distribution method for a full-stroke activity test of a high-pressure steam valve of a steam turbine. Background Art

[0002] At present, most of the 300MW and 600MW steam turbines, which account for the largest proportion, are equipped with two high-pressure main steam valves and 2-6 high-pressure regulating valves. The main steam enters the two high-pressure main steam valves from two routes before passing through the main steam pipeline to the main steam valve of the steam turbine, and then enters the high-pressure cylinder of the steam turbine through several high-pressure regulating valves. The steam after work enters the reheater. At present, the full-stroke activity test of the medium-pressure main valve and medium-pressure regulating valve of most power plants is relatively smooth. However, during the full-stroke activity test of the high-pressure main steam valve and high-pressure regulating valve, problems such as large fluctuations in the unit operating parameters are often encountered, which makes the test unable to proceed smoothly, such as excessive vibration, excessive bearing temperature and other problems. Analysis shows that the main reason is that after the high-pressure regulating valve and main steam valve on one side of the turbine are closed during the test, the main steam can only enter the high-pressure cylinder of the turbine to perform work through the high-pressure regulating valve and main steam valve on the other side, which causes the steam inlet flow of the turbine to be uneven compared with the normal operating conditions, thereby inducing rotor steam flow excitation, excessive vibration, and increased bearing temperature. In order to ensure that the equipment is not damaged, the full-stroke valve activity test can only be terminated.

[0003] Therefore, a device is urgently needed to solve at least one of the above problems. Summary of the invention

[0004] The purpose of the embodiments of the present invention is to provide an auxiliary steam distribution device and method for a full-stroke activity test of a steam turbine high-pressure steam valve, which is used to solve the problem in the prior art that during the full-stroke activity test of the high-pressure steam valve, the main steam enters from one side of the high-pressure cylinder, resulting in uneven steam inlet and inducing steam flow excitation of the high-pressure cylinder rotor.

[0005] In order to achieve the above-mentioned object, the present invention provides, on one hand, a steam turbine high-pressure steam valve full-stroke activity test auxiliary steam distribution device, which is used to evenly distribute main steam to the high-pressure cylinder, and the steam turbine high-pressure steam valve full-stroke activity test auxiliary steam distribution device comprises: A first main pipeline assembly, a second main pipeline assembly and a communication pipeline assembly; One end of the first main pipeline assembly and the second main pipeline assembly is arranged at the steam inlet end of the high-pressure cylinder, and is used to deliver main steam to the high-pressure cylinder; wherein the first main pipeline assembly and the second main pipeline assembly have main steam delivery ports located on different sides of the steam inlet end of the high-pressure cylinder; There is a fluid passage between the first main pipeline assembly and the second main pipeline assembly, and the fluid passage is connected or disconnected through the connecting pipeline assembly; when the fluid passage is connected, the main steam transported from the first main pipeline assembly can enter the second main pipeline assembly after being diverted through the connecting pipeline assembly, and flow into the high-pressure cylinder from the second main pipeline assembly; or, the main steam transported from the second main pipeline assembly can enter the first main pipeline assembly after being diverted through the connecting pipeline assembly, and flow into the high-pressure cylinder from the first main pipeline assembly.

[0006] Specifically, the first main pipeline assembly includes: a first steam main pipe, a first main steam valve, a plurality of first steam branch pipes and a plurality of first branch steam regulating valves; The first steam main pipe has a first main steam inlet and a plurality of first main steam outlets, the first main steam inlet of the first steam main pipe is connected to the steam inlet end of the main steam, and each first steam outlet of the first steam main pipe is connected to the steam inlet end of the high-pressure cylinder through a first steam branch pipe; The first main steam valve is arranged on the first steam main pipe and is used to control the flow rate of the main steam flowing through the first steam main pipe; A first steam regulating valve is arranged on each first steam branch pipe, and the first steam regulating valve is used to regulate the flow of main steam flowing through the corresponding first steam branch pipe.

[0007] Specifically, the second main pipeline assembly includes: a second steam main pipe, a second main steam valve, a plurality of second steam branch pipes and a plurality of second branch steam regulating valves, the second steam branch pipes correspond to the first steam branch pipes one by one, and the first steam branch pipes and the second steam branch pipes are symmetrically arranged in pairs; The second steam main pipe has a second main steam inlet and a plurality of second main steam outlets, the second main steam inlet of the second steam main pipe is connected to the steam inlet end of the main steam, and each second steam outlet is connected to the steam inlet end of the high-pressure cylinder through a second steam branch pipe; The second main steam valve is arranged on the second steam main pipe, and is used to adjust the flow rate of the main steam flowing through the second steam main pipe; A second steam regulating valve is arranged on each second steam branch pipe, and the second steam regulating valve is used to regulate the flow of the main steam flowing through the corresponding second steam branch pipe.

[0008] Specifically, the communication pipeline assembly includes: a plurality of communication branches and a plurality of communication valves; A connecting branch is connected between the second steam branch and the first steam branch. A connecting valve is provided on each connecting branch. The connecting valve is used to adjust the flow of the main steam flowing through the connecting branch and to control the connection or disconnection of the corresponding second steam branch with the first steam branch.

[0009] Specifically, the communication branch pipe, the first steam branch pipe and the second steam branch pipe are made of the same material.

[0010] Another aspect of the present invention provides a method for assisting steam distribution in a full-stroke activity test of a high-pressure steam valve of a steam turbine, which is implemented based on any of the above-mentioned devices for assisting steam distribution in a full-stroke activity test of a high-pressure steam valve of a steam turbine. The method for assisting steam distribution in a full-stroke activity test of a high-pressure steam valve of a steam turbine comprises: The main steam is delivered to the high-pressure cylinder through the first main pipeline assembly or the second main pipeline assembly; wherein a fluid passage is provided between the first main pipeline assembly and the second main pipeline assembly, and the fluid passage is connected or disconnected through the communication pipeline assembly; During the main steam delivery process, the fluid passage is adjusted to a connected state so that the main steam delivered from the first main pipeline assembly enters the second main pipeline assembly after being diverted through the connecting pipeline assembly, and flows into the high-pressure cylinder from the second main pipeline assembly; or, the main steam delivered from the second main pipeline assembly enters the first main pipeline assembly after being diverted through the connecting pipeline assembly, and flows into the high-pressure cylinder from the first main pipeline assembly.

[0011] Specifically, it also includes: in the main steam transportation process, by adjusting the communication regulating valve arranged on the communication branch pipe of the communication pipeline assembly, the flow rate of the main steam flowing through the communication branch pipe is adjusted.

[0012] Specifically, it also includes: before starting the test, using main steam to preheat the connecting branch pipe.

[0013] Specifically, the method of preheating the connecting branch pipe by using the main steam includes: adjusting the opening of the connecting valve on the connecting branch pipe to a set opening and continuously delivering the main steam to the connecting branch pipe for a given period of time.

[0014] Specifically, the set opening is between 5% and 10% of the fully opened contact valve, and the given time is between 10 and 30 minutes.

[0015] The auxiliary steam distribution device for full-stroke activity test of high-pressure steam valve of a steam turbine provided by the present invention can deliver main steam to a high-pressure cylinder through a first main pipeline assembly and a second main pipeline assembly, and a fluid passage is provided between the first main pipeline assembly and the second main pipeline assembly, and the connection or disconnection of the first main pipeline assembly and the second main pipeline assembly can be controlled by a connecting pipeline assembly; during the full-stroke activity test of the high-pressure steam valve of the steam turbine, when the fluid passage is connected, if the main steam is delivered to the high-pressure cylinder through the first main pipeline assembly, one path of main steam flows to the high-pressure cylinder through the first main pipeline assembly, and the other path of main steam is diverted through the connecting pipeline assembly and then enters the second main pipeline assembly, and then enters the high-pressure cylinder; if the main steam is delivered to the high-pressure cylinder through the second main pipeline assembly, one path of main steam flows to the high-pressure cylinder through the second main pipeline assembly, and the other path of main steam is diverted through the connecting pipeline assembly and then enters the first main pipeline assembly, and then enters the high-pressure cylinder. The auxiliary steam distribution device and method for the full-stroke movable test of the high-pressure steam valve of a steam turbine provided by the present invention can deliver main steam into the high-pressure cylinder from both sides of the steam inlet end of the high-pressure cylinder during the full-stroke movable test of the high-pressure cylinder by setting a communication channel assembly, thereby solving the problem in the prior art of uneven steam inlet caused by the main steam entering from the regulating valve on one side of the high-pressure cylinder during the full-stroke movable test of the high-pressure steam valve, thereby inducing steam flow excitation of the high-pressure cylinder rotor and causing excessive vibration.

[0016] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings: Figure 1 It is a schematic diagram of the layout of an auxiliary steam distribution device for a full-stroke movable test of a steam turbine high-pressure steam valve provided by an embodiment of the present invention.

[0018] Description of Reference Numerals 1-first main pipeline assembly; 2-second main pipeline assembly; 3-connecting pipeline assembly; 4-high-pressure cylinder; 11-first steam main pipe; 12-first main steam valve; 13-first steam branch pipe; 14-first steam regulating valve; 21-second steam main pipe; 22-second main steam valve; 23-second steam branch pipe; 24-second steam regulating valve; 31-connecting branch pipe; 32-connecting regulating valve. DETAILED DESCRIPTION

[0019] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0020] Figure 1 Layout diagram of auxiliary steam distribution device for full-stroke activity test of high-pressure steam valve of steam turbine. Figure 1 As shown, on one hand, the present invention provides a steam turbine high-pressure steam valve full-stroke activity test auxiliary steam distribution device, which is used to evenly distribute main steam to the high-pressure cylinder 4. The steam turbine high-pressure steam valve full-stroke activity test auxiliary steam distribution device includes: A first main pipeline component 1, a second main pipeline component 2 and a communication pipeline component 3; The first main pipeline assembly 1 and the second main pipeline assembly 2 are arranged at the steam inlet end of the high-pressure cylinder 4, and are used to deliver main steam to the high-pressure cylinder 4; wherein the first main pipeline assembly 1 and the second main pipeline assembly 2 have main steam delivery ports located on different sides of the steam inlet end of the high-pressure cylinder 4; There is a fluid passage between the first main pipeline assembly 1 and the second main pipeline assembly 2, and the fluid passage is connected or disconnected through the connecting pipeline assembly 3; when the fluid passage is connected, the main steam transported from the first main pipeline assembly 1 can enter the second main pipeline assembly 2 after being diverted through the connecting pipeline assembly 3, and flow from the second main pipeline assembly 2 into the high-pressure cylinder 4; or, the main steam transported from the second main pipeline assembly 2 can enter the first main pipeline assembly 1 after being diverted through the connecting pipeline assembly 3, and flow from the first main pipeline assembly 1 into the high-pressure cylinder 4.

[0021] The auxiliary steam distribution device for full-stroke activity test of high-pressure steam valve of steam turbine provided by the present invention can deliver main steam to high-pressure cylinder 4 through the first main pipeline assembly 1 and the second main pipeline assembly 2. There is a fluid passage between the first main pipeline assembly 1 and the second main pipeline assembly 2, and the connection or disconnection of the fluid passage can be controlled by the connecting pipeline assembly 3. When conducting the full-stroke activity test of high-pressure steam valve of steam turbine, the fluid passage is controlled to be connected, and main steam is delivered to high-pressure cylinder 4 through the first main pipeline assembly 1 or the second main pipeline assembly 2. If main steam is delivered to high-pressure cylinder 4 through the first main pipeline assembly 1, the main steam flowing through the first main pipeline assembly 1 flows in two ways, one way of main steam continues to flow to high-pressure cylinder 4 through the first main pipeline assembly 1, and the other way of main steam is diverted into the connecting pipeline assembly 3 and the second main pipeline assembly 2 and then flows into the high-pressure cylinder 4; if the second main pipeline assembly 2 delivers main steam to high-pressure cylinder 4, the main steam flowing through the second main pipeline assembly 2 flows in two ways, one way of main steam continues to flow to high-pressure cylinder 4 through the second main pipeline assembly 2, and the other way of main steam is diverted into the connecting pipeline assembly 3 and the first main pipeline assembly 2. The steam from the first main pipeline component 1 and the steam from the second main pipeline component 2 are respectively located on different sides of the steam inlet end of the high-pressure cylinder 4, so that the main steam enters the high-pressure cylinder 4 from different sides of the steam inlet end of the high-pressure cylinder 4 through the first main pipeline component 1 and the second main pipeline component 2, thereby balancing the main steam entering the high-pressure cylinder 4 and avoiding the main steam entering from one side of the steam inlet end of the high-pressure cylinder 4, causing the steam inlet to be unbalanced, resulting in the steam flow excitation of the rotor of the high-pressure cylinder 4, and causing the high-pressure cylinder 4 to vibrate excessively. This solves the problem in the prior art that during the full-stroke activity test of the high-pressure steam valve, the main steam enters from the regulating valve on one side of the high-pressure cylinder, resulting in uneven steam inlet, thereby inducing the steam flow excitation of the high-pressure cylinder rotor and causing excessive vibration.

[0022] In one embodiment, Figure 1 As shown, the first main pipeline assembly 1 includes: a first steam main pipe 11, a first main steam valve 12, a plurality of first steam branch pipes 13 and a plurality of first branch steam regulating valves 14; The first steam main pipe 11 has a first main steam inlet and a plurality of first main steam outlets. The first main steam inlet of the first steam main pipe 11 is connected to the steam inlet end of the main steam, and each first steam outlet of the first steam main pipe 11 is connected to the steam inlet end of the high-pressure cylinder 4 through a first steam branch pipe 13. The first main steam valve 12 is disposed on the first steam main pipe 11 and is used to control the flow rate of the main steam flowing through the first steam main pipe 11; A first steam regulating valve 14 is disposed on each first steam branch pipe 13 , and the first steam regulating valve 14 is used to regulate the flow of main steam flowing through the corresponding first steam branch pipe 13 .

[0023] The second main pipeline assembly 2 includes: a second steam main pipe 21, a second main steam valve 22, a plurality of second steam branch pipes 23 and a plurality of second branch steam regulating valves 24, the second steam branch pipes 23 correspond to the first steam branch pipes 13 one by one, and the first steam branch pipes 13 and the second steam branch pipes 23 are symmetrically arranged in pairs; The second steam main pipe 21 has a second main steam inlet and a plurality of second main steam outlets. The second main steam inlet of the second steam main pipe 21 is connected to the steam inlet end of the main steam, and each second steam outlet is connected to the steam inlet end of the high-pressure cylinder 4 through a second steam branch pipe 23. The second main steam valve 22 is disposed on the second steam main pipe 21 and is used to adjust the flow rate of the main steam flowing through the second steam main pipe 21; A second steam regulating valve 24 is disposed on each second steam branch pipe 23 , and the second steam regulating valve 24 is used to regulate the flow of main steam flowing through the corresponding second steam branch pipe 23 .

[0024] The communication pipeline assembly 3 includes: a plurality of communication branches 31 and a plurality of communication valves 32; A connecting branch pipe 31 is connected between the second steam branch pipe 23 and the first steam branch pipe 13. A connecting valve 32 is provided on each connecting branch pipe 31. The connecting valve 32 is used to adjust the flow rate of the main steam of the connecting branch pipe 31, and to control the connection or disconnection of the corresponding second steam branch pipe 23 and the first steam branch pipe 13.

[0025] The communication branch pipe 31 , the first steam branch pipe 13 and the second steam branch pipe 23 are made of the same material.

[0026] The first steam branch pipe 13 and the second steam branch pipe 23 correspond to each other one by one. A first steam regulating valve 14 is provided on each first steam branch pipe 13, and a second steam regulating valve 24 is provided on each second steam branch pipe 23. The first steam branch pipe 13 and the second steam branch pipe 23 are connected through a connecting branch pipe 31. The connecting point of the connecting branch pipe 31 on the first steam branch pipe 13 is located between the first steam regulating valve 14 and the high-pressure cylinder 4, and the connecting point of the connecting branch pipe 31 on the second steam branch pipe 23 is located between the second steam regulating valve 24 and the high-pressure cylinder 4. The corresponding connecting branch pipes are adjusted. The opening of the connecting regulating valve 32 on 31 can control the connection or disconnection of the corresponding first steam branch 13 and the second steam branch 23. The opening of the connecting regulating valve 32 can be paused at any position between 0-100%. When the opening of the connecting regulating valve 32 is adjusted to 0, the main steam cannot flow in the connecting branch 31. At this time, the first steam branch 13 and the second steam branch 23 are disconnected, and the main steam cannot flow from the first steam branch 13 to the second steam branch 23 via the connecting branch 31, or the main steam cannot flow from the second steam branch 23 to the first steam branch 13 via the connecting branch 31.

[0027] If the main steam is transported to the high-pressure cylinder 4 through the first main pipeline assembly 1, the main steam flows through the first steam main pipe 11, and the flow rate of the main steam flowing through the first steam main pipe 11 is adjusted by the first main steam valve 12. The main steam enters each first steam branch pipe 13 from the first main steam outlet of the first steam main pipe 11, and the connecting valve 32 on the connecting branch pipe 31 connected to the corresponding first steam branch pipe 13 is opened. Before the test starts, the opening of the connecting valve 32 is adjusted to between 5% and 10% of the fully open state, and the current opening state of the connecting valve 32 is maintained for 10 to 30 minutes to preheat the connecting branch pipe through the main steam flowing through the connecting branch pipe 31. Then, the connecting valve 32 is adjusted to the fully open state, and the main steam flows to the corresponding second steam branch pipe 23 through the connecting branch pipe 31, and then enters the high-pressure cylinder 4 through the corresponding second steam branch pipe 23. In this way, the main steam can enter from different directions of the steam inlet end of the high-pressure cylinder 4, avoiding the unbalanced steam inlet caused by the steam inlet from one side of the high-pressure cylinder 4.

[0028] If the main steam is delivered to the high-pressure cylinder 4 through the second main pipeline assembly 2, after the main steam flows through the second steam main pipe 21, the flow rate of the main steam flowing through the second steam main pipe 21 is adjusted by the second main steam valve 22, and the main steam enters each second steam branch pipe 23 from the second main steam inlet of the second steam main pipe 21. The connecting valve 32 on the connecting branch pipe 31 connected to the corresponding second steam branch pipe 23 is opened. Before the test starts, the opening of the connecting valve 32 is adjusted to between 5% and 10% of the fully open state, and the current opening state of the connecting valve 32 is maintained for 10 to 30 minutes to preheat the connecting branch pipe through the main steam flowing through the connecting branch pipe 31. Then, the connecting valve 32 is adjusted to the fully open state, and the main steam flows into the corresponding first steam branch pipe 13 through the connecting branch pipe 31. The main steam then enters the high-pressure cylinder 4 through the corresponding first steam branch pipe 13. In this way, the main steam can enter from different directions of the steam inlet end of the high-pressure cylinder 4 to avoid steam inlet imbalance caused by steam inlet from one side of the high-pressure cylinder 4.

[0029] Another aspect of the present invention provides a method for assisting steam distribution in a full-stroke activity test of a high-pressure steam valve of a steam turbine, which is implemented based on any of the above-mentioned devices for assisting steam distribution in a full-stroke activity test of a high-pressure steam valve of a steam turbine. The method for assisting steam distribution in a full-stroke activity test of a high-pressure steam valve of a steam turbine comprises: delivering main steam to the high-pressure cylinder through the first main pipeline assembly or the second main pipeline assembly; There is a fluid passage between the first main pipeline component and the second main pipeline component, and the fluid passage is connected or disconnected through the communication pipeline component; During the main steam delivery process, the fluid passage is adjusted to a connected state so that the main steam delivered from the first main pipeline assembly enters the second main pipeline assembly after being diverted through the connecting pipeline assembly, and flows into the high-pressure cylinder from the second main pipeline assembly; or, the main steam delivered from the second main pipeline assembly enters the first main pipeline assembly after being diverted through the connecting pipeline assembly, and flows into the high-pressure cylinder from the first main pipeline assembly.

[0030] The method also includes: in the main steam delivery process, adjusting the flow of the main steam flowing through the connecting branch pipe by adjusting the connecting valve arranged on the connecting branch pipe of the connecting pipeline assembly.

[0031] The auxiliary steam distribution method for high-pressure cylinder testing also includes: using main steam to preheat the connecting branch pipe before starting the test.

[0032] The method of preheating the connecting branch pipe by using the main steam includes: adjusting the opening of the connecting valve on the connecting branch pipe to a set opening and continuously delivering the main steam to the connecting branch pipe for a given period of time.

[0033] The set opening is between 5% and 10% of the fully opened contact valve, and the given time is between 10 and 30 minutes.

[0034] When it is necessary to transport main steam to the high-pressure cylinder for testing, adjust the load of the turbine unit where the high-pressure cylinder is located to 40%-70% of the rated load, and transport main steam to the high-pressure cylinder through the first main pipeline assembly or the second main pipeline assembly. If the main steam is transported to the high-pressure cylinder through the first main pipeline assembly, the main steam flows in the first main pipeline assembly, and the opening of the connecting valve set on the connecting branch of the connecting pipeline assembly is slowly adjusted. Before the formal test, first adjust the opening of the connecting valve on the connecting branch to between 5%-10% of the fully open connecting valve. At this time, the main steam flows through the connecting branch, and the opening of the connecting valve is kept unchanged. Main steam is continuously transported to the connecting branch for 10-30 minutes. During this period of time, the connecting branch is preheated by the main steam flowing through the connecting branch. After the preheating is completed, adjust the opening of the connecting valve to the fully open state. During the adjustment of the opening of the connecting valve, closely monitor the unit vibration, tile temperature, axial displacement and other parameters. If there is any abnormality, terminate immediately.

[0035] During the test, after the connecting valve is opened, the main steam flows in two ways when it flows to the connection point between the first main pipeline assembly and the connecting pipeline assembly. One way continues to flow along the first main pipeline assembly to the high-pressure cylinder, and the other way flows into the connecting pipeline assembly and the second main pipeline assembly and then enters the high-pressure cylinder; if the main steam is transported to the high-pressure cylinder through the second main pipeline assembly, the main steam flows in the second main pipeline assembly, and the main steam flows in two ways when it flows to the connection point between the second main pipeline assembly and the connecting pipeline assembly. One way continues to flow along the second main pipeline assembly to the high-pressure cylinder, and the other way flows into the connecting pipeline assembly and the first main pipeline assembly and then enters the high-pressure cylinder. In this way, it is always ensured that the main steam can enter from different directions at the steam inlet end of the high-pressure cylinder to avoid unbalanced steam inlet caused by unilateral steam inlet from the steam inlet end of the high-pressure cylinder. After the test, slowly adjust the opening of the connecting valve to 0, monitor the parameters such as unit vibration, tile temperature, axial displacement, etc. during the closing process, and immediately stop the action of the connecting valve if there is any abnormality, and continue to close the connecting valve after the unit operating parameters are normal.

[0036] The auxiliary steam distribution device for full-stroke activity test of high-pressure steam valve of a steam turbine provided by the present invention can deliver main steam to a high-pressure cylinder through a first main pipeline assembly and a second main pipeline assembly, and a fluid passage is provided between the first main pipeline assembly and the second main pipeline assembly, and the connection or disconnection of the first main pipeline assembly and the second main pipeline assembly can be controlled by a connecting pipeline assembly; during the full-stroke activity test of the high-pressure steam valve of the steam turbine, when the fluid passage is connected, if the main steam is delivered to the high-pressure cylinder through the first main pipeline assembly, one path of main steam flows to the high-pressure cylinder through the first main pipeline assembly, and the other path of main steam is diverted through the connecting pipeline assembly and then enters the second main pipeline assembly, and then enters the high-pressure cylinder; if the main steam is delivered to the high-pressure cylinder through the second main pipeline assembly, one path of main steam flows to the high-pressure cylinder through the second main pipeline assembly, and the other path of main steam is diverted through the connecting pipeline assembly and then enters the first main pipeline assembly, and then enters the high-pressure cylinder. The auxiliary steam distribution device and method for the full-stroke movable test of the high-pressure steam valve of a steam turbine provided by the present invention can deliver main steam into the high-pressure cylinder from both sides of the steam inlet end of the high-pressure cylinder during the full-stroke movable test of the high-pressure cylinder by setting a communication channel assembly, thereby solving the problem in the prior art of uneven steam inlet caused by the main steam entering from the regulating valve on one side of the high-pressure cylinder during the full-stroke movable test of the high-pressure steam valve, thereby inducing steam flow excitation of the high-pressure cylinder rotor and causing excessive vibration.

[0037] The optional implementation modes of the embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above implementation modes. Within the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical scheme of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention.

[0038] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe various possible combinations.

[0039] Those skilled in the art can understand that all or part of the steps in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a program, and the program is stored in a storage medium, including a number of instructions to enable a single-chip microcomputer, a chip or a processor to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0040] In addition, various implementation modes of the embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the embodiments of the present invention, they should also be regarded as the contents disclosed by the embodiments of the present invention.

Claims

1. An auxiliary steam distribution device for a full-stroke activity test of a high-pressure steam valve of a steam turbine, used for distributing main steam to a high-pressure cylinder (4), characterized in that: The auxiliary steam distribution device for full-stroke activity test of high-pressure steam valve of steam turbine comprises: A first main pipeline component (1), a second main pipeline component (2) and a communication pipeline component (3); The first main pipeline assembly (1) and the second main pipeline assembly (2) are arranged at the steam inlet end of the high-pressure cylinder (4) and are used to convey main steam to the high-pressure cylinder (4); wherein the first main pipeline assembly (1) and the second main pipeline assembly (2) have main steam conveying ports located on different sides of the steam inlet end of the high-pressure cylinder (4); A fluid passage is provided between the first main pipeline component (1) and the second main pipeline component (2), and the fluid passage is connected or disconnected via the connecting pipeline component (3); when the fluid passage is connected, the main steam delivered from the first main pipeline component (1) can be diverted via the connecting pipeline component (3) and enter the second main pipeline component (2), and flow from the second main pipeline component (2) into the high-pressure cylinder (4); or, the main steam delivered from the second main pipeline component (2) can be diverted via the connecting pipeline component (3) and enter the first main pipeline component (1), and flow from the first main pipeline component (1) into the high-pressure cylinder (4).

2. The auxiliary steam distribution device for full-stroke activity test of high-pressure steam valve of steam turbine according to claim 1, characterized in that: The first main pipeline assembly (1) comprises: a first steam main pipe (11), a first main steam valve (12), a plurality of first steam branch pipes (13) and a plurality of first branch steam regulating valves (14); The first steam main pipe (11) has a first main steam inlet and a plurality of first main steam outlets, the first main steam inlet of the first steam main pipe (11) being connected to the steam inlet end of the main steam, and each first steam outlet of the first steam main pipe (11) being connected to the steam inlet end of the high-pressure cylinder (4) via a first steam branch pipe (13); The first main steam valve (12) is arranged on the first steam main pipe (11) and is used to control the flow rate of main steam flowing through the first steam main pipe (11); A first steam regulating valve (14) is provided on each first steam branch pipe (13), and the first steam regulating valve (14) is used to regulate the flow rate of main steam flowing through the corresponding first steam branch pipe (13).

3. The auxiliary steam distribution device for full-stroke activity test of high-pressure steam valve of steam turbine according to claim 2, characterized in that: The second main pipeline assembly (2) comprises: a second main steam pipe (21), a second main steam valve (22), a plurality of second steam branch pipes (23) and a plurality of second branch steam regulating valves (24), the second steam branch pipes (23) corresponding to the first steam branch pipes (13) one by one, and the first steam branch pipes (13) and the second steam branch pipes (23) being symmetrically arranged in pairs; The second steam main pipe (21) has a second main steam inlet and a plurality of second main steam outlets, the second main steam inlet of the second steam main pipe (21) being connected to the steam inlet end of the main steam, and each second steam outlet being connected to the steam inlet end of the high-pressure cylinder (4) via a second steam branch pipe (23); The second main steam valve (22) is arranged on the second steam main pipe (21) and is used to adjust the flow rate of the main steam flowing through the second steam main pipe (21); A second steam regulating valve (24) is provided on each second steam branch pipe (23), and the second steam regulating valve (24) is used to regulate the flow rate of main steam flowing through the corresponding second steam branch pipe (23).

4. The auxiliary steam distribution device for full-stroke activity test of high-pressure steam valve of steam turbine according to claim 3, characterized in that: The communication pipeline assembly (3) comprises: a plurality of communication branch pipes (31) and a plurality of communication valves (32); A connecting branch pipe (31) is connected between the second steam branch pipe (23) and the first steam branch pipe (13). Each connecting branch pipe (31) is provided with a connecting valve (32). The connecting valve (32) is used to adjust the flow rate of the main steam flowing through the connecting branch pipe (31) and to control the connection or disconnection of the corresponding second steam branch pipe (23) with the first steam branch pipe (13).

5. The auxiliary steam distribution device for full-stroke activity test of high-pressure steam valve of steam turbine according to claim 4, characterized in that: The communication branch pipe (31), the first steam branch pipe (13) and the second steam branch pipe (23) are made of the same material.

6. A method for assisting steam distribution in a full-stroke activity test of a high-pressure steam valve of a steam turbine, which is implemented based on the device for assisting steam distribution in a full-stroke activity test of a high-pressure steam valve of a steam turbine as claimed in any one of claims 1 to 5, characterized in that: The auxiliary steam distribution method for the full-stroke activity test of a steam turbine high-pressure steam valve comprises: The main steam is delivered to the high-pressure cylinder through the first main pipeline assembly or the second main pipeline assembly; wherein a fluid passage is provided between the first main pipeline assembly and the second main pipeline assembly, and the fluid passage is connected or disconnected through the communication pipeline assembly; During the main steam delivery process, the fluid passage is adjusted to a connected state so that the main steam delivered from the first main pipeline assembly enters the second main pipeline assembly after being diverted through the connecting pipeline assembly, and flows into the high-pressure cylinder from the second main pipeline assembly; or, the main steam delivered from the second main pipeline assembly enters the first main pipeline assembly after being diverted through the connecting pipeline assembly, and flows into the high-pressure cylinder from the first main pipeline assembly.

7. The auxiliary steam distribution method for the full-stroke activity test of the steam turbine high-pressure steam valve according to claim 6 is characterized in that: Also includes: During the main steam transportation process, the flow rate of the main steam flowing through the connecting branch pipe is adjusted by adjusting the connecting valve arranged on the connecting branch pipe of the connecting pipeline assembly.

8. The auxiliary steam distribution method for the full-stroke activity test of the steam turbine high-pressure steam valve according to claim 7 is characterized in that: Also includes: Before starting the test, use the main steam to preheat the connecting branch pipe.

9. The auxiliary steam distribution method for the full-stroke activity test of the steam turbine high-pressure steam valve according to claim 7, characterized in that: The method of preheating the connecting branch pipe using main steam comprises: The opening of the connecting valve on the connecting branch pipe is adjusted to the set opening and the main steam is supplied to the connecting branch pipe for a given period of time.

10. The auxiliary steam distribution method for the full-stroke activity test of the steam turbine high-pressure steam valve according to claim 9, characterized in that: The set opening is between 5% and 10% of the fully opened contact valve, and the given time is between 10 and 30 minutes.

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