CN117211900A - Front drainage system of main steam valve of steam turbine - Google Patents
Front drainage system of main steam valve of steam turbine Download PDFInfo
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- CN117211900A CN117211900A CN202311044898.8A CN202311044898A CN117211900A CN 117211900 A CN117211900 A CN 117211900A CN 202311044898 A CN202311044898 A CN 202311044898A CN 117211900 A CN117211900 A CN 117211900A
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- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 99
- 230000001105 regulatory effect Effects 0.000 claims abstract description 78
- 230000001276 controlling effect Effects 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims description 86
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- 238000009792 diffusion process Methods 0.000 claims description 14
- 230000000007 visual effect Effects 0.000 claims description 6
- 239000011159 matrix material Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 210000000476 body water Anatomy 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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Abstract
The application discloses a front drainage system of a main steam valve of a steam turbine, which comprises the following components: the device comprises a cylinder body, a main steam valve, a drain pipeline, a drain flash tank and a control system; the cylinder body is connected with a main steam pipeline, the main steam valve is arranged on the main steam pipeline, the cylinder body and the main steam pipeline are connected with the drain flash vessel through a drain pipeline, and the drain pipeline is provided with a drain valve; a drainage branch pipe is arranged between the drainage pipeline and the drainage expansion vessel, a first drainage regulating valve is arranged on the drainage branch pipe, and a second drainage regulating valve is arranged at the inlet of the drainage expansion vessel; the control system is used for controlling the opening degrees of the first and second hydrophobic regulating valves; the dewatering requirement of the initial stage of the start of the steam turbine is ensured.
Description
Technical Field
The application relates to the technical field of drainage systems, in particular to a front drainage system of a main steam valve of a steam turbine.
Background
New steam from the boiler enters the main steam valve of the steam turbine through the main steam pipe and then enters the cylinder through the regulating valve. At the initial stage of starting the unit or under abnormal conditions, cold steam and cold water in a steam pipeline in front of a main steam valve of the steam turbine need to be drained and sent to a drainage expansion tank, so that serious accidents such as rotor bending and damage to internal parts are avoided due to accumulated water in a cylinder.
However, in the initial stage of starting the steam turbine, the drainage quantity is large, the capacity of the main body drainage expander is small, the drainage requirement cannot be met, the drainage expander is extremely easy to be full of water, and the operation safety of a critical unit is ensured. If the water drain manual door is throttled, the water drain amount cannot meet the water drain requirement during the starting of the steam turbine, the temperature rise before the main steam valve during the water drain heating pipe is slow, the water drain time is long, the effect is poor, and the temperature difference at the side of the main steam valve is large, so that operators need to spend a great deal of time and effort to monitor and adjust the water level of the water drain expansion device, and therefore, a water drain system before the main steam valve of the steam turbine is needed to ensure the water drain requirement.
Disclosure of Invention
The application aims to provide a front drainage system of a main steam valve of a steam turbine, which solves the problems that the capacity of a drainage expander is small, drainage requirements during the starting of the steam turbine cannot be met, and potential safety hazards are caused by easily large temperature difference of the side of the main steam valve during a drainage heating pipe.
The application provides a front drainage system of a main steam valve of a steam turbine, which comprises the following components:
the device comprises a cylinder body, a main steam valve, a drain pipeline, a drain flash tank and a control system;
the cylinder body is connected with a main steam pipeline, the main steam valve is arranged on the main steam pipeline, the cylinder body and the main steam pipeline are connected with the drain flash vessel through a drain pipeline, and the drain pipeline is provided with a drain valve;
a drainage branch pipe is arranged between the drainage pipeline and the drainage expansion vessel, a first drainage regulating valve is arranged on the drainage branch pipe, and a second drainage regulating valve is arranged at the inlet of the drainage expansion vessel;
the control system is used for controlling the opening degrees of the first and second hydrophobic regulating valves;
the control system comprises an acquisition module, a processing module and a control module, wherein the acquisition module is used for acquiring a real-time liquid level value of the drainage expansion tank, the processing module is used for setting control instructions of the first drainage regulating valve and the second drainage regulating valve according to the liquid level value, and the control module is used for controlling opening degrees of the first drainage regulating valve and the second drainage regulating valve according to the control instructions of the processing module.
In some embodiments of the application, a main regulating valve is arranged on a main steam pipeline between the cylinder body and the main steam valve, and the main regulating valve is used for regulating the steam inlet of the steam turbine.
In some embodiments of the application, the hydrophobic tubing comprises a first hydrophobic tubing, a second hydrophobic tubing, a third hydrophobic tubing, a fourth hydrophobic tubing, and a hydrophobic parent tube;
the steam engine is characterized in that a main steam pipeline at the front end and the rear end of the main steam valve is connected with a first drainage pipeline and a second drainage pipeline, the first drainage pipeline is provided with a first drainage valve, the second drainage pipeline is provided with a second drainage valve, a third drainage pipeline is arranged between the second drainage pipeline and the main regulating valve, the third drainage pipeline is provided with a third drainage valve, the cylinder body is connected with a fourth drainage pipeline, the fourth drainage pipeline is provided with a fourth drainage valve, outlets of the third drainage pipeline and the fourth drainage pipeline are connected with a drainage main pipe, and the drainage main pipe is connected with a drainage expansion vessel;
the outlets of the first drainage pipeline and the second drainage pipeline are connected with a high-pressure drainage main pipe.
In some embodiments of the application, the hydrophobic branch pipe inlet is connected with the hydrophobic main pipe, and the hydrophobic branch pipe outlet is communicated with a high-pressure hydrophobic main pipe;
the drain branch pipe is provided with a first drain regulating valve, and the drain main pipe is provided with a second drain regulating valve.
In some embodiments of the application, the acquisition module comprises a liquid level meter arranged in the hydrophobic diffusion vessel and used for detecting the real-time liquid level value of the hydrophobic diffusion vessel in real time.
In some embodiments of the application, the processing module sets control instructions for the first and second hydrophobic adjustment valves according to the liquid level value, comprising:
the processing module is internally provided with a highest liquid level value, a liquid level difference value between the real-time liquid level value and the highest liquid level value is determined, and the opening degrees of the first water drain regulating valve and the second water drain regulating valve are set according to the liquid level difference value.
In some embodiments of the present application, a preset liquid level difference value Y0 is set in the processing module, and Y0 (Y1, Y2, Y3, Y4) is set, wherein Y1 is a first preset liquid level difference value, Y2 is a second preset liquid level difference value, Y3 is a third preset liquid level difference value, Y4 is a fourth preset liquid level difference value, and Y1 < Y2 < Y3 < Y4;
presetting a valve opening matrix P0, and setting P0 (P1, P2, P3 and P4), wherein P1 is a first preset valve opening, P2 is a second preset valve opening, P3 is a third preset valve opening, P4 is a fourth preset valve opening, and P1 is more than P2 and less than P3 and less than P4;
acquiring a real-time liquid level value of the drainage expansion vessel, determining a liquid level difference value y between the real-time liquid level value and the highest liquid level value, and setting valve openings of the first drainage regulating valve and the second drainage regulating valve according to the relation between the liquid level difference value y and each preset liquid level difference value;
when Y is less than Y1, setting the fourth preset valve opening P4 as the valve opening of the first hydrophobic regulation valve, and setting the first preset valve opening P1 as the valve opening of the second hydrophobic regulation valve;
when Y1 is less than or equal to Y2, setting the third preset valve opening P3 as the valve opening of the first hydrophobic regulating valve, and setting the second preset valve opening P2 as the valve opening of the second hydrophobic regulating valve;
when Y2 is less than or equal to Y3, setting the second preset valve opening P2 as the valve opening of the first hydrophobic regulating valve, and setting the third preset valve opening P3 as the valve opening of the second hydrophobic regulating valve;
when Y3 is less than or equal to Y < Y4, setting the first preset valve opening P1 as the valve opening of the first hydrophobic regulating valve, and setting the fourth preset valve opening P4 as the valve opening of the second hydrophobic regulating valve.
In some embodiments of the application, the processing module is further configured to control opening and closing of the second hydrophobic adjustment valve according to the highest liquid level value and the real-time liquid level value;
and when the real-time liquid level value is larger than the highest liquid level value, controlling the second hydrophobic regulating valve to be completely closed.
In some embodiments of the present application, the collecting module further includes a temperature sensor, where the temperature sensor is disposed on the main steam pipe at the front end of the main steam valve, and the temperature sensor is used to detect the initial temperature and the real-time temperature of the main steam valve, and transmit the detected initial temperature and the real-time temperature to the processing module.
In some embodiments of the present application, the control system further includes an alarm module, where the alarm module is used for performing an audible and visual alarm;
the processing module sets an opening and closing state instruction of the first hydrophobic valve according to the initial temperature and the real-time temperature and transmits the instruction to the control module;
a temperature difference threshold is arranged in the processing module, and a temperature difference value between the initial temperature and the real-time temperature is determined;
when the temperature difference is larger than the temperature threshold, the first hydrophobic valve is set to be in a closed state, and the alarm module is controlled to carry out audible and visual alarm.
According to the application, the drainage branch pipe is arranged, so that water which cannot be carried by the drainage expander is led to the high-pressure drainage main pipe of the steam turbine, the drainage requirement of the heating pipe at the initial stage of starting the steam turbine is met, the current situations that the design capacity of the drainage expander of the steam turbine and the design output of the main drainage pump are insufficient are solved, the starting time of the unit is shortened, and the safe starting of the unit is ensured.
And an alarm module is added in the control module, so that when the temperature difference measured by the main steam valve is large, an alarm is given in time, and an operator can be timely reminded to carry out operation adjustment, so that the further increase of the temperature difference is avoided, and the safe starting of the unit is endangered.
The technical scheme of the application is further described in detail through the drawings and the embodiments.
Drawings
FIG. 1 is a schematic diagram of a steam turbine main steam valve front drain system according to the present application;
FIG. 2 is a functional block diagram of a control system in an embodiment of the application.
Reference numerals
1. A cylinder body; 2. a hydrophobic diffusion vessel; 3. a main steam valve; 4. a main regulating valve; 5. a main steam pipe; 61. a first hydrophobic conduit; 62. a second hydrophobic conduit; 63. a third hydrophobic conduit; 64. a fourth hydrophobic conduit; 65. a hydrophobic parent pipe; 71. a first hydrophobic valve; 72. a second hydrophobic valve; 73. a third hydrophobic valve; 74. a fourth hydrophobic valve; 8. the device comprises a hydrophobic branch pipe, 91, a first hydrophobic regulating valve, 92 and a second hydrophobic regulating valve.
Detailed Description
The technical scheme of the application is further described below through the attached drawings and the embodiments.
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, means, components, and/or combinations thereof, but do not exclude other elements or items. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", etc. refer to the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are merely relational terms determined to facilitate description of the structural relationships of the various components or elements of the application, and are not meant to be limiting of the application. Terms such as "fixedly attached," "connected," "coupled," and the like are to be construed broadly and refer to either a fixed connection or an integral or removable connection; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the terms in the present application can be determined according to circumstances by a person skilled in the relevant art or the art, and is not to be construed as limiting the present application.
Examples
According to the summary of the drainage conditions during the multiple starting of the steam turbine, the drainage quantity is large in the initial starting period, the capacity of the drainage expander is small, the drainage requirement cannot be met, the drainage expander is extremely easy to be full of water, and the running safety of a critical unit is ensured. If the water drainage manual door is throttled, the water drainage quantity can not meet the water drainage requirement during the starting period of the steam turbine, the temperature rise before the main steam valve during the water drainage heating pipe is slow, the water drainage time is long, the effect is poor, the temperature difference of the side of the main steam valve is large and easily exceeds 50 ℃, operators need to spend a great deal of time and energy to monitor and adjust the water level of the main body water drainage expansion tank, the heating pipe is required to be temporarily stopped for drainage when the water level is high, the starting time of a unit is greatly prolonged, and potential safety hazards are brought to the starting operation of the unit.
The application provides a steam turbine main steam valve front drainage system, as shown in fig. 1 and 2, comprising:
the cylinder body 1, the main steam valve 3, the drain pipeline, the drain flash tank 2 and the control system.
The cylinder body 1 is connected with a main steam pipeline 5, the main steam valve 3 is arranged on the main steam pipeline 5, the cylinder body 1 and the main steam pipeline 5 are connected with the drain flash tank 2 through a drain pipeline, and the drain pipeline is provided with a drain valve.
A hydrophobic branch pipe 8 is arranged between the hydrophobic pipeline and the hydrophobic diffusion vessel 2, a first hydrophobic regulating valve 91 is arranged on the hydrophobic branch pipe 8, and a second hydrophobic regulating valve 92 is arranged at the inlet of the hydrophobic diffusion vessel 2;
the control system is used for controlling the opening degrees of the first and second hydrophobic adjustment valves 91 and 92.
The control system comprises an acquisition module, a processing module and a control module, wherein the acquisition module is used for acquiring a real-time liquid level value of the drain flash tank 2, the processing module is used for setting control instructions of the first drain regulator valve 91 and the second drain regulator valve 92 according to the liquid level value, and the control module is used for controlling opening degrees of the first drain regulator valve 91 and the second drain regulator valve 92 according to the control instructions of the processing module.
In this embodiment, the hydrophobic valve, the first hydrophobic adjustment valve and the second hydrophobic adjustment valve are shown in the drawings, but the valve may be a single valve or a valve group, and the drawings do not show that only one valve is provided, and a single valve or a valve group may be provided as required.
In some embodiments of the application, a main regulating valve 4 is arranged on a main steam pipeline 5 between the cylinder body 1 and the main steam valve 3, and the main regulating valve 4 is used for regulating the steam inlet of the steam turbine.
In the present embodiment, the main function of the main steam valve 3 is that when the steam turbine needs emergency stop, the main steam valve 3 should be able to be quickly closed to cut off the steam source; secondly, the flow of steam into the cylinder is controlled during start-up. The function of the main regulating valve 4 is to control the steam intake of the turbine by varying the valve opening.
In some embodiments of the present application, detailed structures of the drain pipes are disclosed, including a first drain pipe 61, a second drain pipe 62, a third drain pipe 63, a fourth drain pipe 64, and a drain main 65;
a first drain pipe 61 and a second drain pipe 62 are connected to the main steam pipe 5 at the front end and the rear end of the main steam valve 3, a first drain valve 71 is arranged on the first drain pipe 61, a second drain valve 72 is arranged on the second drain pipe 62, a third drain pipe 63 is arranged between the second drain pipe 62 and the main regulating valve 4, a third drain valve 73 is arranged on the third drain pipe 63, a fourth drain pipe 64 is connected to the cylinder body 1, a fourth drain valve 74 is arranged on the fourth drain pipe 64, outlets of the third drain pipe 63 and the fourth drain pipe 64 are connected with the drain main pipe 65, and the drain main pipe 65 is connected with the drain flash tank 2;
the outlets of the first drain pipe 61 and the second drain pipe 62 are connected with a high-pressure drain main pipe.
In this embodiment, the front and rear drain pipes of the main steam valve 3 are all discharged to the high-pressure drain main pipe, and the third drain pipe 63 and the fourth drain pipe 64 are both connected to the drain main pipe 65, and are connected to the drain flash tank 2 through the drain main pipe 65.
In some embodiments of the application, the hydrophobic branch pipe inlet is connected with the hydrophobic main pipe, and the hydrophobic branch pipe outlet is communicated with a high-pressure hydrophobic main pipe;
the drain branch pipe is provided with a first drain regulating valve, and the drain main pipe is provided with a second drain regulating valve.
In this embodiment, since the capacity of the drain flash tank 2 cannot meet the drain of the main steam pipeline 5 and the cylinder body 1, a drain branch pipe 8 is provided, when the water quantity in the drain flash tank 2 reaches the limit water level, the drain flows to the high-pressure drain main pipe of the steam turbine through the drain branch pipe 8 by adjusting the opening of the drain regulating valve, so that the overall drain requirement is ensured.
In some embodiments of the present application, the collection module includes a level gauge disposed within the hydrophobic flash tank 2 for detecting a real-time level value of the hydrophobic flash tank 2 in real-time.
In this embodiment, the liquid level meter is an instrument for measuring the liquid level change of the liquid in the container, and is connected with the processing module, and when the liquid level meter detects the real-time liquid level value of the hydrophobic diffusion container 2, the liquid level value is timely sent to the processing module, so that the processing module is convenient for carrying out subsequent data processing.
In some embodiments of the application, the processing module sets control instructions for the first and second hydrophobic adjustment valves according to the liquid level value, comprising:
the processing module is internally provided with a highest liquid level value, a liquid level difference value between the real-time liquid level value and the highest liquid level value is determined, and the opening degrees of the first water drain regulating valve 91 and the second water drain regulating valve 92 are set according to the liquid level difference value.
In this embodiment, when the liquid level value in the hydrophobic diffusion vessel 2 is higher, it means that the more liquid is in the hydrophobic diffusion vessel 2, that is, the smaller the remaining liquid capacity in the hydrophobic diffusion vessel 2, the liquid discharged into the hydrophobic diffusion vessel 2 needs to be reduced, and the opening degrees of the first hydrophobic adjustment valve 91 and the second hydrophobic adjustment valve 92 need to be adjusted according to the need, so as to ensure the hydrophobic requirement of the steam turbine.
In some embodiments of the present application, a method for determining the valve opening degrees of the first and second hydrophobic adjustment valves is disclosed, wherein a preset liquid level difference value Y0 is set in the processing module, and Y0 (Y1, Y2, Y3, Y4) is set, wherein Y1 is a first preset liquid level difference value, Y2 is a second preset liquid level difference value, Y3 is a third preset liquid level difference value, Y4 is a fourth preset liquid level difference value, and Y1 < Y2 < Y3 < Y4.
Presetting a valve opening matrix P0, and setting P0 (P1, P2, P3 and P4), wherein P1 is a first preset valve opening, P2 is a second preset valve opening, P3 is a third preset valve opening, P4 is a fourth preset valve opening, and P1 is more than P2 and less than P3 and less than P4.
Acquiring a real-time liquid level value of the drainage expansion vessel, determining a liquid level difference value y between the real-time liquid level value and the highest liquid level value, and setting valve openings of the first drainage regulating valve and the second drainage regulating valve according to the relation between the liquid level difference value y and each preset liquid level difference value.
When Y is less than Y1, setting the fourth preset valve opening P4 as the valve opening of the first hydrophobic regulation valve, and setting the first preset valve opening P1 as the valve opening of the second hydrophobic regulation valve;
when Y1 is less than or equal to Y < Y2, setting the third preset valve opening P3 as the valve opening of the first hydrophobic regulating valve, and setting the second preset valve opening P2 as the valve opening of the second hydrophobic regulating valve.
When Y2 is less than or equal to Y3, setting the second preset valve opening P2 as the valve opening of the first hydrophobic regulating valve, and setting the third preset valve opening P3 as the valve opening of the second hydrophobic regulating valve.
When Y3 is less than or equal to Y < Y4, setting the first preset valve opening P1 as the valve opening of the first hydrophobic regulating valve, and setting the fourth preset valve opening P4 as the valve opening of the second hydrophobic regulating valve.
In some embodiments of the application, the processing module is further configured to control opening and closing of the second hydrophobic finish valve based on the maximum liquid level value and the real-time liquid level value.
And when the real-time liquid level value is larger than the highest liquid level value, controlling the second hydrophobic regulating valve to be completely closed.
In this embodiment, when the real-time liquid level value is greater than the highest liquid level value, it indicates that the inside of the hydrophobic diffusion vessel is full, and it is not suitable to continue to drain the liquid to the hydrophobic diffusion vessel, so the second hydrophobic adjustment valve needs to be closed.
In some embodiments of the present application, the collecting module further includes a temperature sensor, where the temperature sensor is disposed on the main steam pipe at the front end of the main steam valve, and the temperature sensor is used to detect the initial temperature and the real-time temperature of the main steam valve, and transmit the detected initial temperature and the real-time temperature to the processing module.
In some embodiments of the application, the control system further comprises an alarm module for performing an audible and visual alarm.
The processing module sets an opening and closing state instruction of the first hydrophobic valve according to the initial temperature and the real-time temperature, and transmits the instruction to the control module.
And a temperature difference threshold value is arranged in the processing module, and a temperature difference value between the initial temperature and the real-time temperature is determined.
When the temperature difference is larger than the temperature threshold, the first hydrophobic valve is set to be in a closed state, and the alarm module is controlled to carry out audible and visual alarm.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application and not for limiting it, and although the present application has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that: the technical scheme of the application can be modified or replaced by the same, and the modified technical scheme cannot deviate from the spirit and scope of the technical scheme of the application.
The system provided in the foregoing embodiment is only exemplified by the division of the foregoing functional modules, and in practical applications, the foregoing functional allocation may be performed by different functional modules according to needs, that is, the modules or steps in the embodiments of the present application are further decomposed or combined, for example, the modules in the foregoing embodiment may be combined into one module, or may be further split into multiple sub-modules, so as to complete all or part of the functions described above. The names of the modules and steps related to the embodiments of the present application are merely for distinguishing the respective modules or steps, and are not to be construed as unduly limiting the present application.
Those of skill in the art will appreciate that the various illustrative modules, method steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the program(s) corresponding to the software modules, method steps, may be embodied in Random Access Memory (RAM), memory, read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. To clearly illustrate this interchangeability of electronic hardware and software, various illustrative components and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as electronic hardware or software depends upon the particular application and design constraints imposed on the solution. Those skilled in the art may implement the described functionality using different approaches for each particular application, but such implementation is not intended to be limiting.
Claims (10)
1. A steam turbine main steam valve front drain system, comprising:
the device comprises a cylinder body, a main steam valve, a drain pipeline, a drain flash tank and a control system;
the cylinder body is connected with a main steam pipeline, the main steam valve is arranged on the main steam pipeline, the cylinder body and the main steam pipeline are connected with the drain flash vessel through a drain pipeline, and the drain pipeline is provided with a drain valve;
a drainage branch pipe is arranged between the drainage pipeline and the drainage expansion vessel, a first drainage regulating valve is arranged on the drainage branch pipe, and a second drainage regulating valve is arranged at the inlet of the drainage expansion vessel;
the control system is used for controlling the opening degrees of the first and second hydrophobic regulating valves;
the control system comprises an acquisition module, a processing module and a control module, wherein the acquisition module is used for acquiring a real-time liquid level value of the drainage expansion tank, the processing module is used for setting control instructions of the first drainage regulating valve and the second drainage regulating valve according to the liquid level value, and the control module is used for controlling opening degrees of the first drainage regulating valve and the second drainage regulating valve according to the control instructions of the processing module.
2. A steam turbine main steam valve front drain system according to claim 1, wherein,
and a main regulating valve is arranged on a main steam pipeline between the cylinder body and the main steam valve and is used for regulating the steam inlet of the steam turbine.
3. A steam turbine main steam valve front drain system according to claim 2, wherein,
the drainage pipeline comprises a first drainage pipeline, a second drainage pipeline, a third drainage pipeline, a fourth drainage pipeline and a drainage main pipe;
the steam engine is characterized in that a main steam pipeline at the front end and the rear end of the main steam valve is connected with a first drainage pipeline and a second drainage pipeline, the first drainage pipeline is provided with a first drainage valve, the second drainage pipeline is provided with a second drainage valve, a third drainage pipeline is arranged between the second drainage pipeline and the main regulating valve, the third drainage pipeline is provided with a third drainage valve, the cylinder body is connected with a fourth drainage pipeline, the fourth drainage pipeline is provided with a fourth drainage valve, outlets of the third drainage pipeline and the fourth drainage pipeline are connected with a drainage main pipe, and the drainage main pipe is connected with a drainage expansion vessel;
the outlets of the first drainage pipeline and the second drainage pipeline are connected with a high-pressure drainage main pipe.
4. A steam turbine main steam valve front drain system according to claim 3, wherein,
the inlet of the drainage branch pipe is connected with the drainage main pipe, and the outlet of the drainage branch pipe is communicated with the high-pressure drainage main pipe;
the drain branch pipe is provided with a first drain regulating valve, and the drain main pipe is provided with a second drain regulating valve.
5. A steam turbine main steam valve front drain system according to claim 1, wherein,
the acquisition module comprises a liquid level meter which is arranged in the hydrophobic diffusion vessel and used for detecting the real-time liquid level value of the hydrophobic diffusion vessel in real time.
6. A steam turbine main steam valve front drain system according to claim 1, wherein,
the processing module sets control instructions of the first hydrophobic regulating valve and the second hydrophobic regulating valve according to the liquid level value, and the control instructions comprise:
the processing module is internally provided with a highest liquid level value, a liquid level difference value between the real-time liquid level value and the highest liquid level value is determined, and the opening degrees of the first water drain regulating valve and the second water drain regulating valve are set according to the liquid level difference value.
7. A steam turbine main steam valve front drain system according to claim 6, wherein,
the processing module is internally provided with a preset liquid level difference value Y0 and Y0 (Y1, Y2, Y3 and Y4), wherein Y1 is a first preset liquid level difference value, Y2 is a second preset liquid level difference value, Y3 is a third preset liquid level difference value, Y4 is a fourth preset liquid level difference value, and Y1 is more than Y2 and less than Y3 and less than Y4;
presetting a valve opening matrix P0, and setting P0 (P1, P2, P3 and P4), wherein P1 is a first preset valve opening, P2 is a second preset valve opening, P3 is a third preset valve opening, P4 is a fourth preset valve opening, and P1 is more than P2 and less than P3 and less than P4;
acquiring a real-time liquid level value of the drainage expansion vessel, determining a liquid level difference value y between the real-time liquid level value and the highest liquid level value, and setting valve openings of the first drainage regulating valve and the second drainage regulating valve according to the relation between the liquid level difference value y and each preset liquid level difference value;
when Y is less than Y1, setting the fourth preset valve opening P4 as the valve opening of the first hydrophobic regulation valve, and setting the first preset valve opening P1 as the valve opening of the second hydrophobic regulation valve;
when Y1 is less than or equal to Y2, setting the third preset valve opening P3 as the valve opening of the first hydrophobic regulating valve, and setting the second preset valve opening P2 as the valve opening of the second hydrophobic regulating valve;
when Y2 is less than or equal to Y3, setting the second preset valve opening P2 as the valve opening of the first hydrophobic regulating valve, and setting the third preset valve opening P3 as the valve opening of the second hydrophobic regulating valve;
when Y3 is less than or equal to Y < Y4, setting the first preset valve opening P1 as the valve opening of the first hydrophobic regulating valve, and setting the fourth preset valve opening P4 as the valve opening of the second hydrophobic regulating valve.
8. A steam turbine main steam valve front drain system according to claim 6, wherein,
the processing module is also used for controlling the opening and closing of the second hydrophobic regulating valve according to the highest liquid level value and the real-time liquid level value;
and when the real-time liquid level value is larger than the highest liquid level value, controlling the second hydrophobic regulating valve to be completely closed.
9. A steam turbine main steam valve front drain system according to claim 3, wherein,
the acquisition module further comprises a temperature sensor, wherein the temperature sensor is arranged on a main steam pipeline at the front end of the main steam valve, and the temperature sensor is used for detecting the initial temperature and the real-time temperature of the main steam valve and transmitting the initial temperature and the real-time temperature to the processing module.
10. A steam turbine main steam valve front drain system according to claim 9, wherein,
the control system also comprises an alarm module, wherein the alarm module is used for performing audible and visual alarm;
the processing module sets an opening and closing state instruction of the first hydrophobic valve according to the initial temperature and the real-time temperature and transmits the instruction to the control module;
a temperature difference threshold is arranged in the processing module, and a temperature difference value between the initial temperature and the real-time temperature is determined;
when the temperature difference is larger than the temperature threshold, the first hydrophobic valve is set to be in a closed state, and the alarm module is controlled to carry out audible and visual alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311044898.8A CN117211900A (en) | 2023-08-17 | 2023-08-17 | Front drainage system of main steam valve of steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311044898.8A CN117211900A (en) | 2023-08-17 | 2023-08-17 | Front drainage system of main steam valve of steam turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117211900A true CN117211900A (en) | 2023-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311044898.8A Pending CN117211900A (en) | 2023-08-17 | 2023-08-17 | Front drainage system of main steam valve of steam turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117211900A (en) |
-
2023
- 2023-08-17 CN CN202311044898.8A patent/CN117211900A/en active Pending
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