CN116066181A - Cooling steam system of thermal power heating unit steam turbine - Google Patents
Cooling steam system of thermal power heating unit steam turbine Download PDFInfo
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- CN116066181A CN116066181A CN202211574647.6A CN202211574647A CN116066181A CN 116066181 A CN116066181 A CN 116066181A CN 202211574647 A CN202211574647 A CN 202211574647A CN 116066181 A CN116066181 A CN 116066181A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D13/00—Combinations of two or more machines or engines
- F01D13/02—Working-fluid interconnection of machines or engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/105—Final actuators by passing part of the fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/003—Arrangements for testing or measuring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/08—Cooling; Heating; Heat-insulation
- F01D25/12—Cooling
Abstract
The invention provides a cooling steam system of a steam turbine of a thermal power generating and heating unit, and belongs to the technical field of heat supply of thermal power plants. The system comprises: a medium-low pressure communication pipeline assembly; two ends of the medium-low pressure communication pipeline assembly are respectively communicated with the medium-pressure cylinder and the low-pressure cylinder; the medium-low pressure communication pipeline component is provided with a double-valve plate butterfly valve; the double-valve-plate butterfly valve is used for adjusting the steam flow discharged from the medium pressure cylinder to the low pressure cylinder so as to ensure that the low pressure cylinder runs safely and stably. The cooling steam system of the thermal power heating unit steam turbine not only can flexibly adjust the steam flow discharged from the medium pressure cylinder to the low pressure cylinder so as to ensure the safe and stable operation of the low pressure cylinder, but also has simple structure and low cost, and also avoids the problems of unbalanced thrust, large stress, uneven cooling and the like of a newly added steam pipeline to the low pressure communicating pipe in the prior art.
Description
Technical Field
The invention relates to the technical field of heat supply of thermal power plants, in particular to a cooling steam system of a thermal power heat supply unit steam turbine.
Background
In recent years, in order to respond to important deployment of national energy conservation and emission reduction, thermal power plants actively promote flexible transformation, and promote and apply thermal decoupling technology transformation, and advanced mature technical schemes such as low-pressure cylinder micro-output and the like are suitable for factory manufacture.
The low-pressure cylinder micro-output refers to the transformation of low-pressure cylinder micro-output heat supply of a thermal power heating unit, namely, after the thermal power heating unit steam is subjected to work of a high-pressure cylinder and a medium-pressure cylinder, the steam is discharged from the medium-pressure cylinder and enters the low-pressure cylinder to work for power generation through a medium-pressure and low-pressure communicating pipe, a flap butterfly valve is arranged on the communicating pipe, the flow rate of the steam inlet is regulated through the butterfly valve, so that a small part of the steam enters a low-pressure cylinder cooling rotor, the problems of blowing, heat dissipation and the like of the low-pressure cylinder rotor are solved, the technology can effectively improve the heat supply capacity of the unit, meanwhile, the low-pressure cylinder hardly performs power generation, and the thermal decoupling capacity of the unit is improved, but the butterfly valve cannot realize flexible regulation of the flow rate of the low-pressure cylinder steam inlet. Therefore, in order to achieve the purpose of flexible adjustment of the low-pressure cylinder, the solution is to add a cooling steam system, namely, a cooling steam bypass is arranged in front of and behind a butterfly valve of a medium-low pressure communicating pipe for cooling a rotor of the low-pressure cylinder, and a cooling steam bypass is arranged in front of and behind the butterfly valve of the medium-low pressure communicating pipe.
However, since the newly added cooling steam system has components such as a steam line, a regulating valve, and a throttle valve, there are problems such as complicated structure, high cost, and limited modification space, and there are problems such as unbalanced thrust, large stress, and uneven cooling of the communication pipe.
Disclosure of Invention
The embodiment of the invention aims to provide a cooling steam system of a steam turbine of a thermal power generating and heating unit, which aims to solve the problems of complex structure, high cost, limited transformation space, unbalanced thrust, larger stress, uneven cooling and the like of a communicating pipe in the prior art.
In order to achieve the above object, an embodiment of the present invention provides a cooling steam system of a steam turbine of a thermal power generating and heating unit, including: a medium-low pressure communication pipeline assembly; two ends of the medium-low pressure communication pipeline assembly are respectively communicated with the medium-pressure cylinder and the low-pressure cylinder; the medium-low pressure communication pipeline component is provided with a double-valve plate butterfly valve; the double-valve-plate butterfly valve is used for adjusting steam flow discharged from the medium pressure cylinder to the low pressure cylinder so as to enable the low pressure cylinder to run safely and stably.
Optionally, the double-valve plate butterfly valve comprises a main valve plate and a small valve plate arranged at the center of the main valve plate; the cross section of the small valve plate is smaller than that of the main valve plate;
when the low pressure cylinder is in normal operation, the main valve plate is opened and the small valve plate is closed, so that the medium pressure cylinder can discharge steam to the low pressure cylinder to drive the rotor of the low pressure cylinder to normally rotate for doing work;
when the low pressure cylinder is in micro-output operation, the main valve plate is closed, the small valve plate is opened, the steam flow discharged from the medium pressure cylinder to the low pressure cylinder can be regulated, so that a low pressure cylinder rotor is cooled, and the final stage blade dynamic stress of the low pressure cylinder is maintained within a safe operation range;
optionally, a first temperature monitoring device and a first pressure monitoring device are installed on the middle-low pressure communication pipeline assembly, and the first temperature monitoring device and the first pressure monitoring device are located behind the double-valve-plate butterfly valve;
the first temperature monitoring device is used for monitoring the steam temperature of steam discharged from the medium pressure cylinder to the low pressure cylinder;
the first pressure monitoring device is used for monitoring the steam pressure of the steam discharged from the medium pressure cylinder to the low pressure cylinder.
Optionally, the low pressure cylinder is communicated with a low pressure cylinder steam exhaust pipe; the steam of the low-pressure cylinder is discharged into a steam discharge pipe of the low-pressure cylinder; a second temperature monitoring device is arranged in the low-pressure cylinder; a second pressure monitoring device is arranged on the low-pressure cylinder steam exhaust pipe;
the second temperature monitoring device is used for monitoring the temperature of the last stage blade of the low pressure cylinder;
the second pressure monitoring device is used for monitoring the steam pressure of the steam discharged from the low-pressure cylinder steam discharge pipe.
Optionally, the main valve plate is driven by hydraulic pressure; the driving mode of the small valve plate is electric driving.
Optionally, the number of the first temperature monitoring devices includes at least three; the number of first pressure monitoring devices includes at least three.
Optionally, at least three second temperature monitoring devices are respectively installed on two sides of the exhaust steam outlet of the low-pressure cylinder.
Optionally, the second temperature monitoring device is a type E thermocouple.
Optionally, the pressure monitoring accuracy of the second pressure monitoring device is greater than the pressure monitoring accuracy of the first pressure monitoring device.
Optionally, a three-way pipe is installed on the middle-low pressure communication pipeline assembly and is positioned between the double-valve-plate butterfly valve and the middle pressure cylinder; the medium-low pressure communication pipeline component comprises a medium-pressure cylinder steam exhaust pipe and a medium-low pressure communication pipe; two ends of the medium pressure cylinder steam exhaust pipe are respectively communicated with the input end of the three-way pipe and the medium pressure cylinder; two ends of the middle-low pressure communicating pipe are respectively communicated with the first output end of the three-way pipe and the low pressure cylinder; the second output end of the three-way pipe is communicated with a heat supply pipe; the heating pipe is provided with a first safety valve, a second safety valve, a check valve, a quick-closing valve and a shutoff valve in sequence.
In an embodiment of the present invention, there is provided a cooling steam system of a steam turbine of a thermal power generating and heating unit, the system including: a medium-low pressure communication pipeline assembly; two ends of the medium-low pressure communication pipeline assembly are respectively communicated with the medium-pressure cylinder and the low-pressure cylinder; the medium-low pressure communication pipeline component is provided with a double-valve plate butterfly valve; the double-valve-plate butterfly valve is used for adjusting the steam flow discharged from the medium pressure cylinder to the low pressure cylinder so as to ensure that the low pressure cylinder runs safely and stably. The cooling steam system of the thermal power heating unit steam turbine not only can flexibly adjust the steam flow discharged from the medium pressure cylinder to the low pressure cylinder so as to ensure the safe and stable operation of the low pressure cylinder, but also has simple structure and low cost, and also avoids the problems of unbalanced thrust, large stress, uneven cooling and the like of a newly added steam pipeline to the low pressure communicating pipe in the prior art.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain, without limitation, the embodiments of the invention. In the drawings:
fig. 1 is a schematic structural diagram of a cooling steam system of a steam turbine of a thermal power generating and heating unit according to an embodiment of the present invention.
Description of the reference numerals
1. A cooling steam system of a steam turbine of a thermal power heating unit; 2. a medium pressure cylinder;
3. a three-way pipe; 4. a medium-low pressure communication pipeline assembly; 5. double-valve plate butterfly valve;
6. a first temperature monitoring device; 7. a first pressure monitoring device; 8. a low pressure cylinder;
9. a second temperature monitoring device; 10. A low pressure cylinder exhaust pipe;
11. a second pressure monitoring device; 12. A heat supply pipe; 13. A first safety valve;
14. a second safety valve; 15. a check valve; 16. a quick closing valve; 17. a shut-off valve;
41. a medium pressure cylinder exhaust pipe; 42. medium-low pressure communicating pipe.
Detailed Description
The following describes the detailed implementation of the embodiments of the present invention with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
Unless defined otherwise, 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; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
In the description of the embodiments of the present application, the technical terms "first," "second," etc. are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.
The following detailed description is provided to facilitate understanding of the concepts of the invention:
the steam turbine is also called a steam turbine engine, and is a rotary steam power device, high-temperature and high-pressure steam passes through a fixed nozzle to become accelerated airflow and then is sprayed onto blades, so that a rotor provided with a blade row rotates and simultaneously does work outwards. The steam is required to do work, the pressure must be reduced and the volume is expanded, so that the high pressure is required to be expanded to the medium pressure/low pressure, and the high pressure, the medium pressure and the low pressure are respectively distributed in three cylinders, namely: the high pressure cylinder, the medium pressure cylinder and the low pressure cylinder are connected through bearings.
At present, steam of a traditional thermal power generating unit is discharged from a middle pressure cylinder after acting through a high and medium pressure cylinder, enters a low pressure cylinder through a middle and low pressure communicating pipe to act for power generation, and a flap plate butterfly valve is arranged on the communicating pipe, but the valve cannot realize small flow adjustment of steam inflow of the low pressure cylinder. In order to popularize and apply the technical transformation of 'thermal decoupling', the factory is preferably provided with a low-pressure cylinder micro-output and other mature technical schemes, namely, a cooling steam bypass is arranged in front of and behind a medium-low pressure communicating pipe for cooling a low-pressure cylinder rotor, so that the problems of air blowing, heat dissipation and the like of the low-pressure cylinder rotor are solved, the low-pressure cylinder hardly does work to generate electricity, but a newly added cooling steam system is provided with components such as a steam pipeline, a regulating valve, a throttle valve and the like, the system is complex, the manufacturing cost is high, the transformation space is limited and the like, and the problems of unbalanced thrust, larger stress, uneven cooling and the like of the newly added system to the communicating pipe also exist.
Therefore, the invention provides a cooling steam system of a steam turbine of a thermal power generating unit, a double-valve plate butterfly valve is arranged on a medium-low pressure communicating pipe, the opening degrees of a main valve plate and a small valve plate of the double-valve plate butterfly valve are controlled to regulate the steam flow discharged from a medium pressure cylinder to a low pressure cylinder, and additionally, a temperature and pressure monitoring point is additionally arranged to monitor the temperature and the pressure of steam in real time so as to ensure that the low pressure cylinder is in a normal state. Because the transformation is not large to the transformation of medium-low pressure communication, need not newly add pipeline and relevant valve to make simple structure, the cost is also very low, has still avoided the unbalanced, stress big and the cooling inhomogeneous scheduling problem of thrust to original medium-low pressure communicating pipe because of newly adding the steam line moreover.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a cooling steam system of a steam turbine of a thermal power generating unit according to an embodiment of the present invention.
The cooling steam system 1 of the thermal power heating unit steam turbine comprises: a medium-low pressure communication pipeline assembly 4; the two ends of the medium-low pressure communication pipeline assembly 4 are respectively communicated with the medium-pressure cylinder 2 and the low-pressure cylinder 8; the medium-low pressure communication pipeline assembly 4 is provided with a double-valve plate butterfly valve 5; the double-valve plate butterfly valve 5 is used for adjusting the steam flow discharged from the medium pressure cylinder 2 to the low pressure cylinder 8 so as to ensure safe and stable operation of the low pressure cylinder 8.
The rotor of the medium pressure cylinder 2 is connected to the rotor of the low pressure cylinder 8 through a bearing. The rotor of the middle pressure cylinder 2 is driven to rotate by the steam exhausted by the high pressure cylinder, and the rotor of the low pressure cylinder 8 is driven to rotate by the steam exhausted by the middle pressure cylinder 2, and as the rotor of the middle pressure cylinder 2 is connected with the rotor of the low pressure cylinder 8 through a bearing, the rotor of the middle pressure cylinder 2 and the rotor of the low pressure cylinder 8 can drive the bearing together to do work to generate electricity.
It can be appreciated that the two ends of the medium pressure cylinder 2 and the low pressure cylinder 8 are respectively communicated through the medium pressure and low pressure communication pipeline assembly 4, so that the steam discharged from the medium pressure cylinder 2 can be transmitted to the low pressure cylinder 8.
In an embodiment, the material of the double-valve-plate butterfly valve 5 may be a high-temperature and high-pressure resistant material, so that damage caused by steam discharged by the medium pressure cylinder 2 can be avoided, and the service life of the double-valve-plate butterfly valve is prolonged.
In this embodiment, since the double-valve plate butterfly valve 5 is installed on the medium-low pressure communication pipeline assembly 4 for communicating the medium pressure cylinder 2 with the low pressure cylinder, this not only enables flexible adjustment of the steam flow discharged from the medium pressure cylinder 2 to the low pressure cylinder 8 to ensure the normal operation of the low pressure cylinder 8, but also eliminates the need for adding new pipelines and valves, so that the cooling steam system 1 of the steam turbine of the thermal power generating unit has a simple structure and low cost, and also avoids the problems of unbalanced thrust, large stress, uneven cooling and the like of the original medium-low pressure communication pipe due to the new steam pipeline.
Optionally, the double-valve plate butterfly valve 5 includes a main valve plate and a small valve plate disposed at the center of the main valve plate; the cross section of the small valve plate is smaller than that of the main valve plate; when the low pressure cylinder 8 is in normal operation, the main valve plate is opened and the small valve plate is closed, so that the medium pressure cylinder 2 can discharge steam to the low pressure cylinder 8 to drive the rotor of the low pressure cylinder 8 to normally rotate for doing work; when the low pressure cylinder 8 is in micro-output operation, the main valve plate is closed, the small valve plate is opened, and the steam flow discharged from the medium pressure cylinder 2 to the low pressure cylinder 8 can be regulated to cool the low pressure cylinder rotor, so that the final stage blade dynamic stress of the low pressure cylinder rotor is maintained in a safe operation range.
It will be appreciated that the cross section of the main valve plate of the double-valve plate butterfly valve 5 is larger than the cross section of the small valve plate, because the size of the steam flow discharged from the medium pressure cylinder 2 to the low pressure cylinder 8 can be adjusted in this way, so that the normal operation of the low pressure cylinder 8 under different operating conditions can be satisfied.
It is understood that the double-valve-plate butterfly valve 5 has a triple eccentric structure, and can be in sealing connection with the medium-low pressure communication pipeline assembly 4, so that steam is ensured not to leak, and the accuracy of steam flow discharged from the medium-pressure cylinder 2 to the low-pressure cylinder 8 is improved by controlling the double-valve butterfly valve 5.
In this embodiment, when the low pressure cylinder 8 needs to perform work normally, the steam flow discharged from the medium pressure cylinder 8 should not be too small, so that the main valve plate with the larger cross section of the butterfly valve 5 with double valve plates needs to be opened and the small valve plate is closed, so that the steam flow discharged from the medium pressure cylinder 2 to the low pressure cylinder 8 is larger, and the rotation of the rotor in the low pressure cylinder 8 is driven to perform work; when the low pressure cylinder 8 is in the micro-output period, the steam flow discharged from the medium pressure cylinder 8 is not required to be excessively large as long as the cooling requirement of the low pressure cylinder rotor can be met, so that the small valve plate with the smaller cross section of the butterfly valve 5 of the double valve plate is required to be opened and the main valve plate is required to be closed, so that the steam flow discharged from the medium pressure cylinder 2 to the low pressure cylinder 8 is smaller and only used for cooling the rotor in the low pressure cylinder, and the problem of heat dissipation of the air blast of the rotor is solved.
Optionally, the middle-low pressure communication pipeline assembly 4 is provided with a first temperature monitoring device 6 and a first pressure monitoring device 7, and the first temperature monitoring device 6 and the first pressure monitoring device 7 are positioned behind the double-valve plate butterfly valve 5; the first temperature monitoring device 6 is used for monitoring the steam temperature of steam discharged from the medium pressure cylinder 2 to the low pressure cylinder 8; the first pressure monitoring device 7 is used for monitoring the steam pressure of steam discharged from the intermediate pressure cylinder 2 to the low pressure cylinder 8.
In order to better monitor the steam parameters entering the low pressure cylinder 8, the first temperature monitoring device 6 and the first pressure monitoring device 7 are installed on the medium-low pressure communication pipeline assembly 4, so as to monitor whether the temperature and the pressure of the steam discharged from the medium pressure cylinder 2 to the low pressure cylinder 8 meet the operation requirements of the low pressure cylinder 8, thereby ensuring the normal operation of the low pressure cylinder.
In an embodiment, the mounting positions of the first temperature monitoring device 6 and the first pressure monitoring device 7 may be different, so long as they are mounted after the double-valve plate butterfly valve 5.
In this embodiment, the first temperature monitoring device 6 and the first force monitoring device 7 are installed on the middle-low pressure communication pipeline assembly 4, so that the middle-pressure cylinder 2 can be discharged, and then the temperature and the pressure of steam regulated by the double-valve plate butterfly valve 5 are monitored, so that whether the low-pressure cylinder 8 can meet the normal operation or not can be judged according to the monitored temperature and pressure.
Alternatively, the low pressure cylinder 8 is communicated with a low pressure cylinder exhaust pipe 10; the steam of the low-pressure cylinder 8 is discharged into a low-pressure cylinder steam discharge pipe 10; a second temperature monitoring device 9 is arranged in the low-pressure cylinder 8; the low-pressure cylinder exhaust pipe 10 is provided with a second pressure monitoring device 11; the second temperature monitoring device 9 is used for monitoring the temperature of the last stage blade of the low pressure cylinder; the second pressure monitoring means 11 is for monitoring the steam pressure of the exhaust steam in the low pressure cylinder exhaust pipe 10.
It should be noted that, in a normal way, the steam entering the low pressure cylinder 8 will be cooled and depressurized, and after the rotor in the low pressure cylinder 8 is cooled, the temperature and pressure of the discharged steam should be reduced, so a pressure monitoring device may be installed on the low pressure cylinder exhaust pipe 10 to monitor the pressure of the steam, so that it may be determined whether the low pressure cylinder is in normal operation according to the monitored pressure.
Specifically, the second temperature monitoring devices 9 are installed at both sides of the last stage blade of the low pressure cylinder to monitor the temperature of the rotor blade in the low pressure cylinder 8 in real time, thereby judging whether the temperature in the low pressure cylinder 8 meets the requirement according to the monitored temperature; the second pressure monitoring device 11 is installed on the low pressure cylinder exhaust pipe 10, and is capable of monitoring whether the pressure of the steam discharged from the low pressure cylinder 8 meets a normal theoretical value, and if the monitored pressure value does not meet the normal theoretical value, it is indicated that the low pressure cylinder 8 is not operating normally.
In the present embodiment, by installing the second temperature monitoring devices 9 on both sides of the last stage blade of the low pressure cylinder 8 and installing the second pressure monitoring devices 11 on the low pressure cylinder exhaust pipe 10, it is possible to monitor the temperature of the rotor inside the low pressure cylinder 8 and the pressure of the steam exhausted from the low pressure cylinder 8 in real time, thereby judging whether the low pressure cylinder 8 is operating normally during the micro-force operation according to the monitored temperature and pressure.
Optionally, the main valve plate is driven by hydraulic pressure; the small valve plate is driven by electric drive.
Specifically, because when the main valve plate of the double-valve plate butterfly valve 5 is opened, the steam flow passing through is larger, and the impact force received by the double-valve plate butterfly valve 5 is larger at the moment, stronger power is required to drive the main valve plate to open or close so as to realize better control of the steam flow, the driving mode of the main valve plate adopts hydraulic driving. On the contrary, when the small valve plate of the double-valve plate butterfly valve 5 is opened, when the passing steam flow is larger, the impact force received by the double-valve plate butterfly valve 5 is smaller, stronger power is not needed to drive the opening or closing of the small valve plate, and common power driving measures are adopted, so that the small valve plate is driven by adopting electric driving.
In the present embodiment, by setting the driving mode of the main valve plate of the double-valve plate butterfly valve 5 to hydraulic driving and the driving mode of the small valve plate to electric driving, the normal operation of the double-valve plate butterfly valve 5 can be ensured, and the steam flow discharged from the medium pressure cylinder 8 to the low pressure cylinder 2 can be controlled better.
Optionally, the number of first temperature monitoring means 6 comprises at least three; the number of first pressure monitoring means 7 comprises at least three.
Since the temperature and pressure of the steam entering the low pressure cylinder 8 can be monitored more accurately, it is necessary to provide the plurality of temperature monitoring devices 6 and the plurality of pressure monitoring devices 7 so that the temperatures and pressures monitored by the plurality of temperature monitoring devices 6 and the plurality of pressure monitoring devices can be compared to determine whether the monitored temperatures and pressures are erroneous.
It is to be understood that the plurality of first temperature monitoring devices 6 are used for monitoring the temperatures of the corresponding positions of the medium-low pressure communication pipe assembly 4, and the plurality of first pressure monitoring devices 7 are used for monitoring the pressures of the corresponding positions of the medium-low pressure communication pipe assembly 4.
In the present embodiment, by providing the plurality of first temperature monitoring devices 6 and the plurality of first pressure monitoring devices 7 on the middle-low pressure communication pipe assembly 4, the temperature and the pressure of the steam entering the low pressure cylinder 8 can be accurately monitored, so that it can be accurately judged whether the low pressure cylinder 8 can satisfy normal operation according to the monitored temperature and pressure.
Optionally, at least three second temperature monitoring devices 9 are installed on both sides of the exhaust outlet of the low pressure cylinder 8.
It will be appreciated that since the rotor of the low pressure cylinder 8 is driven by the vanes, and when the flow rate into the low pressure cylinder becomes low, the low pressure cylinder rotor suffers from problems such as air blowing and heat dissipation, and the temperature of the low pressure cylinder rotor (particularly the last stage vanes) needs to be monitored, a plurality of second temperature monitoring devices 9 need to be installed on both sides of the exhaust outlet of the low pressure cylinder 8. Generally, at least three second temperature monitoring devices 9 are required to be installed on each side to ensure monitoring accuracy.
In the present embodiment, by installing at least three second temperature monitoring devices 9 on both sides of the last stage blade of the low pressure cylinder 8, the temperature of the last stage blade of the low pressure cylinder can be monitored, so that the temperature of the low pressure cylinder rotor can be accurately monitored, so that whether the low pressure cylinder rotor has a blowing problem can be accurately judged.
Optionally, the second temperature monitoring device 9 is a type E thermocouple.
In the present embodiment, since the sensitivity of the E-type thermocouple is large for heat and a minute temperature change is easily measured, the second temperature monitoring device 9 is configured as an E-type thermocouple so that the temperature of the last stage blade in the low pressure cylinder 8 can be accurately monitored so that whether or not the low pressure cylinder rotor has a blowing problem can be further accurately judged.
Alternatively, the pressure monitoring accuracy of the second pressure monitoring device 11 is greater than the pressure monitoring accuracy of the first pressure monitoring device 7.
It will be appreciated that since the pressure of the steam in the middle-low pressure cylinder communication pipe assembly 4 is greater than the pressure of the steam in the low pressure cylinder discharge pipe 10, the second pressure monitoring device 10 mounted on the low pressure cylinder discharge pipe 10 needs to monitor the pressure of the smaller steam, and if the pressure monitoring device with the greater monitoring accuracy is adopted, the pressure of the steam discharged from the low pressure cylinder 8 cannot be easily and accurately monitored, so the monitoring accuracy of the second pressure monitoring device needs to be greater than the pressure monitoring accuracy of the first pressure monitoring device 7.
In the present embodiment, by adopting the second pressure monitoring device 11 with a larger monitoring accuracy, the pressure of the steam discharged from the low pressure cylinder 8 can be monitored more accurately, thereby realizing that whether the low pressure cylinder 8 is operating normally can be judged accurately.
Optionally, a three-way pipe 3 is installed on the medium-low pressure communication pipeline assembly 4 and is positioned between the double-valve-plate butterfly valve 5 and the medium-pressure cylinder 2; the medium-low pressure communication pipeline assembly 4 comprises a medium-pressure cylinder steam exhaust pipe 41 and a medium-low pressure communication pipe 42; two ends of the medium pressure cylinder steam exhaust pipe 41 are respectively communicated with the input end of the three-way pipe 3 and the medium pressure cylinder 2; two ends of the middle-low pressure communicating pipe 42 are respectively communicated with the first output end of the three-way pipe 3 and the low pressure cylinder 8; the second output end of the three-way pipe 3 is communicated with a heat supply pipe 12; the heat supply pipe 12 is provided with a first relief valve 13, a second relief valve 14, a check valve 15, a quick-closing valve 16 and a shut-off valve 17 in this order.
It should be noted that the first safety valve 13, the second safety valve 14, the check valve 15, the quick-closing valve 16 and the shutoff valve 17 belong to the prior art of the steam turbine of the existing thermal power generating unit, and their functions are not described herein.
In this embodiment, by installing the three-way pipe 3 on the medium-low pressure communicating pipe 4, three ends of the three-way pipe 3 are respectively communicated with the heat supply pipe 12, the medium-pressure cylinder steam exhaust pipe 41 and the medium-low pressure communicating pipe 42, so that steam exhausted from the medium-pressure cylinder 2 can be transmitted to the low-pressure cylinder 8 for carrying out micro-output work or normal work power generation of the low-pressure cylinder 8, and heat can be directly supplied through the heat supply pipe 12.
The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not substantially affect the essential novel features of the combination. The use of the terms "comprises" or "comprising" to describe combinations of elements, components, or steps herein also contemplates embodiments consisting essentially of such elements, components, or steps. By using the term "may" herein, it is intended that any attribute described as "may" be included is optional. Multiple elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, component, section or step is not intended to exclude other elements, components, sections or steps.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.
Claims (10)
1. A cooling steam system of a thermal power generating and heating unit steam turbine, comprising: a medium-low pressure communication pipeline assembly; two ends of the medium-low pressure communication pipeline assembly are respectively communicated with the medium-pressure cylinder and the low-pressure cylinder; the medium-low pressure communication pipeline component is provided with a double-valve plate butterfly valve; the double-valve-plate butterfly valve is used for adjusting steam flow discharged from the medium pressure cylinder to the low pressure cylinder so as to enable the low pressure cylinder to run safely and stably.
2. A cooling steam system of a thermal power generating unit steam turbine according to claim 1, wherein the double-valve plate butterfly valve includes a main valve plate and a small valve plate provided at a center of the main valve plate; the cross section of the small valve plate is smaller than that of the main valve plate;
when the low pressure cylinder is in normal operation, the main valve plate is opened and the small valve plate is closed, so that the medium pressure cylinder can discharge steam to the low pressure cylinder to drive the rotor of the low pressure cylinder to normally rotate for doing work;
when the low pressure cylinder is in micro-output operation, the main valve plate is closed, the small valve plate is opened, the steam flow discharged from the medium pressure cylinder to the low pressure cylinder can be regulated, so that the low pressure cylinder rotor is cooled, and the final stage blade dynamic stress of the low pressure cylinder rotor is maintained within a safe operation range.
3. The cooling steam system of a thermal power generating and heating unit steam turbine according to claim 1, wherein a first temperature monitoring device and a first pressure monitoring device are installed on the medium-low pressure communication pipeline assembly, and the first temperature monitoring device and the first pressure monitoring device are located behind the double-valve plate butterfly valve;
the first temperature monitoring device is used for monitoring the steam temperature of steam discharged from the medium pressure cylinder to the low pressure cylinder;
the first pressure monitoring device is used for monitoring the steam pressure of the steam discharged from the medium pressure cylinder to the low pressure cylinder.
4. A cooling steam system of a steam turbine of a thermal power generating and heating unit according to claim 1, wherein the low pressure cylinder is communicated with a low pressure cylinder steam exhaust pipe; the steam of the low-pressure cylinder is discharged into a steam discharge pipe of the low-pressure cylinder; a second temperature monitoring device is arranged in the low-pressure cylinder; a second pressure monitoring device is arranged on the low-pressure cylinder steam exhaust pipe;
the second temperature monitoring device is used for monitoring the temperature of the last stage blade of the low pressure cylinder;
the second pressure monitoring device is used for monitoring the steam pressure of the steam discharged from the low-pressure cylinder steam discharge pipe.
5. A cooling steam system of a steam turbine of a thermal power generating and heating unit according to claim 2, wherein the driving mode of the main valve plate is hydraulic driving; the driving mode of the small valve plate is electric driving.
6. A cooling steam system of a thermal power generating unit steam turbine according to claim 3, wherein the number of first temperature monitoring devices comprises at least three; the number of first pressure monitoring devices includes at least three.
7. A cooling steam system of a steam turbine of a thermal power generating and heating unit according to claim 4, wherein at least three second temperature monitoring devices are respectively arranged on two sides of a steam outlet of the low pressure cylinder.
8. A cooling steam system of a thermal power generating unit steam turbine according to claim 7, wherein the second temperature monitoring device is an E-type thermocouple.
9. A cooling steam system of a thermal power generating unit steam turbine according to claim 4, wherein the pressure monitoring accuracy of the second pressure monitoring device is greater than the pressure monitoring accuracy of the first pressure monitoring device.
10. A cooling steam system of a thermal power generating unit steam turbine according to claim 1, wherein a three-way pipe is installed on the medium-low pressure communication pipeline assembly and is positioned between the double-valve plate butterfly valve and the medium pressure cylinder; the medium-low pressure communication pipeline component comprises a medium-pressure cylinder steam exhaust pipe and a medium-low pressure communication pipe; two ends of the medium pressure cylinder steam exhaust pipe are respectively communicated with the input end of the three-way pipe and the medium pressure cylinder; two ends of the middle-low pressure communicating pipe are respectively communicated with the first output end of the three-way pipe and the low pressure cylinder; the second output end of the three-way pipe is communicated with a heat supply pipe; the heating pipe is provided with a first safety valve, a second safety valve, a check valve, a quick-closing valve and a shutoff valve in sequence.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211574647.6A CN116066181A (en) | 2022-12-08 | 2022-12-08 | Cooling steam system of thermal power heating unit steam turbine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211574647.6A CN116066181A (en) | 2022-12-08 | 2022-12-08 | Cooling steam system of thermal power heating unit steam turbine |
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| CN202211574647.6A Pending CN116066181A (en) | 2022-12-08 | 2022-12-08 | Cooling steam system of thermal power heating unit steam turbine |
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| CN (1) | CN116066181A (en) |
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