CN115013083B - Bypass system of double-steam-inlet-parameter multi-shaft steam turbine unit and working method - Google Patents
Bypass system of double-steam-inlet-parameter multi-shaft steam turbine unit and working method Download PDFInfo
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- CN115013083B CN115013083B CN202210652650.9A CN202210652650A CN115013083B CN 115013083 B CN115013083 B CN 115013083B CN 202210652650 A CN202210652650 A CN 202210652650A CN 115013083 B CN115013083 B CN 115013083B
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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
- F01D19/00—Starting of machines or engines; Regulating, controlling, or safety means in connection therewith
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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
- F01D13/003—Combinations of two or more machines or engines with at least two independent shafts, i.e. cross-compound
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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
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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
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Abstract
The invention provides a bypass system of a double-steam-inlet-parameter multi-shaft turbine unit, namely a working method, which comprises the following steps: the high-pressure starting bypass, the high-pressure standby bypass, the low-pressure starting bypass and the low-pressure standby bypass can meet the requirements of various starting working conditions of the first high-pressure steam source, the second high-pressure steam source, the first low-pressure steam source and the second low-pressure steam source, and the heating surface safety of the steam sources can be protected; the requirements of starting and operating working conditions of three turbines of the high-pressure cylinder, the first low-pressure cylinder and the second low-pressure cylinder can be met, the starting time of a unit is shortened, and the damage of the turbines can be reduced; the steam consumption requirements of different steam turbines in the case of faults can be met; when the unit is started and stopped, working media are recovered, so that noise is reduced; before the turbine is turned, a clean steam-water circulation system is established, and after the steam purity reaches a specified standard, the steam is introduced into the turbine, so that the turbine is prevented from being polluted.
Description
Technical Field
The invention relates to the technical field of turbine unit bypass systems, in particular to a double-steam-inlet-parameter multi-shaft turbine unit bypass system and a working method thereof.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The bypass system refers to a steam system which bypasses the steam turbine through a temperature and pressure reducing device connected to the outlet of a cylinder of the steam turbine without entering or not entering all the superheated steam transmitted by the steam source into the steam turbine. The bypass system is mainly used for coordinating unbalance between the steam source and the steam consumption of the steam turbine. And during the starting period of the unit, the starting speed of the steam source is increased. When the turbine unit throws load, residual steam passes through the bypass system, so that the transient transition working condition of the steam source is stable in operation, the starting and load carrying characteristics are improved, the service life consumption of the unit is reduced, and the operation safety and economy are improved.
The inventor finds that the matching working conditions of the steam source and the steam turbine set are complex for the multi-shaft steam turbine generator set with double steam inlet parameters, and particularly when the generator set is started and fails, the multi-valve matching control is needed, and a characteristic bypass system of the multi-shaft steam turbine generator set with double steam inlet parameters is not available in the prior art.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a bypass system of a double-steam-inlet-parameter multi-shaft steam turbine unit and a working method thereof, which can meet the requirements of various starting working conditions of various steam sources such as a first high-pressure steam source, a second high-pressure steam source, a first low-pressure steam source, a second low-pressure steam source and the like, and can protect the heating surface of the steam sources.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention provides a bypass system of a double-steam-inlet-parameter multi-shaft turbine unit.
A dual-admission parameter multi-shaft turbine unit bypass system comprising:
the high-pressure starting bypass is characterized in that an output pipeline of a first high-pressure steam source is divided into a first high-pressure output pipeline and a second high-pressure output pipeline, the output pipeline of the second high-pressure steam source is divided into a third output pipeline and a fourth output pipeline, the second high-pressure output pipeline and the fourth output pipeline are converged into a first main pipeline, a first shutoff valve is arranged on the second high-pressure output pipeline, a second shutoff valve is arranged on the fourth output pipeline, a high-pressure starting bypass valve and a first safety valve are arranged on the first main pipeline, the first main pipeline is divided into a first branch pipe communicated with a first condenser and a second branch pipe communicated with a second condenser, a first vacuum shutoff valve is arranged on the first branch pipe, and a second vacuum shutoff valve is arranged on the second branch pipe;
high pressure backup bypass: the first high-pressure output pipeline and the third output pipeline are converged into a second main pipe, a fifth shutoff valve is arranged on the first high-pressure output pipeline, a sixth shutoff valve is arranged on the second high-pressure output pipeline, the second main pipe is divided into a third branch pipe and a fourth branch pipe, the third branch pipe is communicated with a steam header, and the fourth branch pipe is communicated with a high-pressure cylinder through a high-pressure main steam valve;
low pressure start-up bypass: the output pipeline of the first low-pressure steam source is divided into a first low-pressure output pipeline and a second low-pressure output pipeline, the output pipeline of the second low-pressure steam source is divided into a third low-pressure output pipeline and a fourth low-pressure output pipeline, the first low-pressure output pipeline is communicated with the steam header after passing through a ninth shut-off valve, the third low-pressure output pipeline is communicated with the steam header after passing through a tenth shut-off valve, the second low-pressure output pipeline and the fourth low-pressure output pipeline are converged into a third main pipe, the third main pipe is divided into a fifth branch pipe and a sixth branch pipe after passing through a low-pressure start bypass valve, the fifth branch pipe is communicated with the first condenser through a third vacuum valve, the sixth branch pipe is communicated with the second condenser through a fourth vacuum valve, and the third main pipe is communicated with the second low-pressure cylinder through a branch pipe;
low pressure backup bypass: the first condenser is communicated with the steam header through a first low-pressure standby bypass valve, and the second condenser is communicated with the steam header through a second low-pressure standby bypass valve.
Further, a first low-pressure main valve is arranged on a communicating pipeline between the first low-pressure cylinder and the steam header, and a second low-pressure main valve is arranged on a communicating pipeline between the second low-pressure cylinder and the steam header.
Further, the output pipeline of the high-pressure cylinder is divided into a first high-pressure cylinder output pipeline and a second high-pressure cylinder output pipeline, the first high-pressure cylinder output pipeline is communicated with an eleventh shutoff valve for emptying, the second high-pressure cylinder output pipeline is communicated with a steam header, and the second high-pressure cylinder output pipeline is provided with a high-pressure cylinder steam exhaust check valve and a high-pressure cylinder steam exhaust butterfly valve which are connected in series.
The second aspect of the invention provides a working method of the bypass system of the double-steam-inlet-parameter multi-shaft turbine unit, which comprises the following steps:
the high-pressure starting bypass valve, the high-pressure standby bypass valve, the first shutoff valve, the second shutoff valve, the first vacuum shutoff valve, the second vacuum shutoff valve, the low-pressure starting bypass valve, the first low-pressure standby bypass valve, the second low-pressure standby bypass valve, the third shutoff valve, the fourth shutoff valve, the third vacuum shutoff valve, the fourth vacuum shutoff valve, the first safety valve and the second safety valve are all opened.
Further, the first high-pressure steam source starting condition includes:
when the first high-pressure steam source is started, the fifth shutoff valve and the second shutoff valve are closed, the first shutoff valve and the high-pressure starting bypass valve are opened, and the first vacuum shutoff valve or the second vacuum shutoff valve is opened along with a related operation condenser; the steam at the outlet of the first high-pressure steam source is discharged into the condenser through the first shutoff valve, the high-pressure starting bypass valve and the first vacuum shutoff valve or the second vacuum shutoff valve.
Further, when the second high pressure steam source is not operating, it includes:
when the steam parameters meet the starting requirement of the high-pressure cylinder, the high-pressure main valve is opened, and the high-pressure starting bypass valve is gradually closed;
if the low pressure cylinder does not operate, the high pressure cylinder steam exhaust check valve and the high pressure cylinder steam exhaust butterfly valve are opened along with the high pressure main valve, if the first low pressure cylinder is to be started, the first low pressure standby bypass valve is opened, after the steam parameters meet the low pressure cylinder starting conditions, the first low pressure main valve is opened, and the first low pressure standby bypass valve is gradually closed;
if the low-pressure cylinder is operated, the high-pressure cylinder exhaust check valve and the high-pressure cylinder exhaust butterfly valve are closed, the eleventh shutoff valve is opened, and the high-pressure cylinder exhaust is discharged to the air; after the steam parameters meet the starting conditions of the low-pressure cylinder, a steam discharge check valve of the high-pressure cylinder and a steam discharge butterfly valve of the high-pressure cylinder are opened, an eleventh shutoff valve is closed, and steam discharged by the high-pressure cylinder enters a steam header;
when the second high-pressure steam source is operated, the high-pressure start bypass valve is gradually closed after the steam parameters meet the steam merging requirement of the second high-pressure steam source.
Further, the first low pressure steam source start condition includes:
when the first low-pressure steam source is started, the third shut-off valve and the tenth shut-off valve are closed, the fourth shut-off valve, the seventh shut-off valve and the low-pressure start bypass valve are opened, and the third vacuum shut-off valve or the fourth vacuum shut-off valve is opened along with the related operation condenser; the steam at the outlet of the first low-pressure steam source is discharged into a condenser through a seventh shut-off valve, a fourth shut-off valve, a low-pressure starting bypass valve and a third vacuum shut-off valve or a fourth vacuum shut-off valve;
after the steam parameters meet the steam inlet requirements of the low-pressure cylinder, the tenth shutoff valve is opened, steam enters the steam header and then enters the low-pressure cylinder, and the low-pressure starting bypass valve is gradually closed.
Further, when the second low-pressure steam source is started, the fourth shut-off valve and the ninth shut-off valve are closed, the third shut-off valve, the eighth shut-off valve and the low-pressure start bypass valve are opened, and the third vacuum shut-off valve or the fourth vacuum shut-off valve is opened along with the related operation condenser; the steam at the outlet of the second low-pressure steam source is discharged into a condenser through an eighth shut-off valve, a third shut-off valve, a low-pressure starting bypass valve and a third vacuum shut-off valve or a fourth vacuum shut-off valve;
after the steam parameters meet the steam inlet requirements of the low-pressure cylinder, the ninth shutoff valve is opened, steam enters the steam header and then enters the low-pressure cylinder, and the low-pressure starting bypass valve is gradually closed.
Further, the high pressure cylinder fault condition includes:
when the high-pressure cylinder fails, the high-pressure main valve, the high-pressure cylinder steam discharge butterfly valve and the high-pressure cylinder steam discharge check valve are closed, the high-pressure standby bypass valve is opened, and steam is discharged to the steam header through the high-pressure standby bypass valve.
Further, the low pressure cylinder fails
When the first low-pressure cylinder fails, the first low-pressure main valve is closed, the first low-pressure standby bypass valve is opened, and steam is discharged to the first condenser through the first low-pressure standby bypass valve;
when the second low-pressure cylinder fails, the second low-pressure main valve is closed, the second low-pressure standby bypass valve is opened, and steam is discharged to the second condenser through the second low-pressure standby bypass valve.
Compared with the prior art, the invention has the beneficial effects that:
1. the bypass system of the double-steam-inlet-parameter multi-shaft turbine unit and the working method thereof can meet the requirements of various starting working conditions of the first high-pressure steam source, the second high-pressure steam source, the first low-pressure steam source and the second low-pressure steam source, and can protect the safety of the heating surfaces of the steam sources.
2. The bypass system of the double-steam-inlet-parameter multi-shaft turbine unit and the working method thereof can meet the requirements of starting and operating working conditions of three turbines of a high-pressure cylinder, a first low-pressure cylinder and a second low-pressure cylinder, shorten the starting time of the unit and reduce the damage of the turbines.
3. The bypass system of the double-steam-inlet-parameter multi-shaft turbine unit and the working method can meet the steam absorption requirements of different turbines in fault.
4. According to the bypass system and the working method of the double-steam-inlet-parameter multi-shaft turbine unit, working media are recovered when the unit is started and stopped, and noise is reduced.
5. According to the bypass system of the double-steam-inlet-parameter multi-shaft turbine unit and the working method, a clean steam-water circulation system is established before the turbine is turned, and the steam is introduced into the turbine after the purity of the steam reaches the specified standard, so that the turbine is prevented from being polluted.
Additional aspects of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are included to provide a further understanding 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 the invention.
FIG. 1 is a schematic diagram of a bypass system of a double-steam-inlet-parameter multi-shaft turbine unit according to an embodiment of the present invention.
1, starting a bypass valve at high pressure; 2. a shut-off valve A; 3. a shut-off valve B; 4. a vacuum shut-off valve A; 5. a vacuum shut-off valve B; 6. a safety valve A; 7. a high pressure backup bypass valve; 8. a low-pressure standby bypass valve A; 9. a low-pressure standby bypass valve B; 10. a low pressure start bypass valve; 11. a shut-off valve C; 12. a shut-off valve D; 13. a vacuum shut-off valve C; 14. a vacuum shut-off valve D; 15. a safety valve B; 16. a shut-off valve E; 17. a shut-off valve F; 18. a shut-off valve G; 19. a shut-off valve H; 20. a shut-off valve I; 21. a shut-off valve J; 22. a shut-off valve K; 23. a high pressure main steam valve; 24. a low-pressure main valve A; 25. a low-pressure main valve B; 26. a high-pressure cylinder exhaust butterfly valve; 27. a high-pressure cylinder exhaust check valve; 28. a high-pressure cylinder; 29. a low pressure cylinder A; 30. a low pressure cylinder B; 31. a condenser A; 32. a condenser B; 33. a high-pressure steam source A; 34. a high-pressure steam source B; 35. a low-pressure steam source A; 36. a low-pressure steam source B; 37. a steam header.
Detailed Description
The invention will be further described with reference to the drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of 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 invention 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 invention. 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 the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
Embodiments of the invention and features of the embodiments may be combined with each other without conflict.
Example 1:
as shown in fig. 1, embodiment 1 of the present invention provides a bypass system of a dual-admission-parameter multi-shaft turbine unit, including:
high pressure start bypass: the high-pressure start bypass valve 1 is selected according to 30% of the capacity of the high-pressure steam source A33 (namely, the first high-pressure steam source). The branch pipes are connected from the front of the high-pressure steam source outlet shutoff valve E16 (namely a fifth shutoff valve) and the shutoff valve F17 (namely a sixth shutoff valve), and are respectively converged into a first main pipe after passing through the shutoff valve A2 (namely a first shutoff valve) and the shutoff valve B3 (namely a second shutoff valve), the first main pipe is provided with a high-pressure starting bypass valve 1 and a safety valve A6 (namely a first safety valve), and then are connected to the condenser A31 (namely a first condenser) and the condenser B32 (namely a second condenser) by branch pipes, and the two branch pipes are respectively provided with a vacuum shutoff valve A4 (namely a first vacuum shutoff valve) and a vacuum shutoff valve B5 (namely a second vacuum shutoff valve).
High pressure backup bypass: the high-pressure backup bypass valve 7 is selected according to 100% capacity of the high-pressure cylinder 28, a pipe is connected from a high-pressure main steam pipe to the steam header 37, and the high-pressure backup bypass valve 7 is provided.
Wherein, first high-pressure output pipeline and third output pipeline are assembled into the second main pipe, are equipped with shut-off valve E16 on the first high-pressure output pipeline, are equipped with shut-off valve F17 on the second high-pressure output pipeline, and the second main pipe divide into third branch pipe and fourth branch pipe, and the third branch pipe communicates with the steam header, and the fourth branch pipe communicates with high-pressure cylinder 28 through high-pressure main steam valve 23.
Low pressure start-up bypass: the low-pressure starting bypass valve 10 is selected according to 30% of the capacity of the low-pressure steam source A35, a branch pipe is connected from the front of the shutoff valve I20 (namely a ninth shutoff valve) and the front of the shutoff valve J21 (namely a tenth shutoff valve), the branch pipes are respectively converged into a third main pipe after passing through the shutoff valve C11 (namely a third shutoff valve) and the shutoff valve D12 (namely a fourth shutoff valve), the third main pipe is provided with the low-pressure starting bypass valve 10 and the safety valve B15 (namely a second safety valve), and then is divided into branch pipes which are connected to the condenser A31 (namely a first condenser) and the condenser B32 (namely a second condenser), and the two branch pipes are respectively provided with the vacuum shutoff valve C13 (namely a third vacuum shutoff valve) and the vacuum shutoff valve D14 (namely a fourth vacuum shutoff valve).
Low pressure backup bypass: the low-pressure standby bypass valve is selected according to 100% capacity of the low-pressure cylinder, and pipelines are from the steam header to the condenser A31 and the condenser B32, and the low-pressure standby bypass valve A8 (namely a first low-pressure standby bypass valve) and the low-pressure standby bypass valve B9 (namely a second low-pressure standby bypass valve) are respectively arranged.
A low-pressure main valve a24 (i.e. a first low-pressure main valve) is arranged on a communicating pipeline between the low-pressure cylinder a29 (i.e. a first low-pressure cylinder) and the steam header 37, and a low-pressure main valve B25 (i.e. a second low-pressure main valve) is arranged on a communicating pipeline between the low-pressure cylinder B30 (i.e. a second low-pressure cylinder) and the steam header 37.
The output pipeline of the high-pressure cylinder 28 is divided into a first high-pressure cylinder output pipeline and a second high-pressure cylinder output pipeline, wherein the first high-pressure cylinder output pipeline is communicated with a shutoff valve K22 (namely an eleventh shutoff valve) for emptying, the second high-pressure cylinder output pipeline is communicated with a steam header, and the second high-pressure cylinder output pipeline is provided with a high-pressure cylinder steam discharge check valve 27 and a high-pressure cylinder steam discharge butterfly valve 26 which are connected in series.
The working method of the system comprises the following steps:
s1: normal operation condition of machine set
The high-pressure starting bypass valve 1, the high-pressure standby bypass valve 7, the shutoff valve A2, the shutoff valve B3, the vacuum shutoff valve A4, the vacuum shutoff valve B5, the low-pressure starting bypass valve 10, the low-pressure standby bypass valve A8, the low-pressure standby bypass valve B9, the shutoff valve C11, the shutoff valve D12, the vacuum shutoff valve C13, the vacuum shutoff valve D14, the safety valve A6 and the safety valve B15 are closed, and the rest valves are all opened.
Under the working condition, the bypass system is reserved for the system and is not put into use.
S2: high-pressure steam source A33 starting working condition
When the high-pressure steam source A33 is started, the shutoff valve E16 and the shutoff valve B3 are closed, the shutoff valve A2 and the high-pressure starting bypass valve 1 are opened, and the vacuum shutoff valve A4 or the vacuum shutoff valve B5 is opened along with the related operation condenser. At this time, the steam at the outlet of the high-pressure steam source A33 is discharged into the condenser through the shut-off valve A2, the high-pressure start bypass valve 1 and the vacuum shut-off valve A4 or the vacuum shut-off valve B5.
S2.1: when the high-pressure steam source B34 is not in operation
Under the working condition, the high-pressure starting bypass system can realize the smooth starting of the high-pressure steam source A, and can recover working media and meet the requirement of starting the high-pressure cylinder on steam.
When the steam parameters meet the high-pressure cylinder starting requirements, the high-pressure main valve 23 is opened, and the high-pressure starting bypass valve 1 is gradually closed.
S2.1.1: if the low pressure cylinder does not operate, the high pressure cylinder steam discharge check valve 27 and the high pressure cylinder steam discharge butterfly valve 26 are opened along with the high pressure main valve 23, if the low pressure cylinder A29 is to be started, the low pressure standby bypass valve A8 is opened, after the steam parameters meet the low pressure cylinder starting conditions, the low pressure main valve A24 is opened, and the low pressure standby bypass valve A8 is gradually closed.
Under the working condition, the low-pressure standby bypass system can recycle working medium and meet the requirement of starting the low-pressure cylinder on steam.
S2.1.2: if the low pressure cylinder is operated, the high pressure cylinder exhaust check valve 27 and the high pressure cylinder exhaust butterfly valve 26 are closed, the shutoff valve K22 is opened, and the high pressure cylinder exhaust air is exhausted; after the steam parameters meet the starting conditions of the low-pressure cylinder, the high-pressure cylinder steam discharge check valve 27 and the high-pressure cylinder steam discharge butterfly valve 26 are opened, the shutoff valve K22 is closed, and the high-pressure cylinder steam discharge enters the steam header 37.
Under the working condition, the air exhaust system of the high-pressure cylinder is used for realizing the parameter matching of the exhaust steam of the high-pressure cylinder and the low-pressure main steam so as to meet the requirement of pushing the low-pressure cylinder together to do work.
S2.2: when the high-pressure steam source B34 is operated
After the steam parameters meet the requirements of the high-pressure steam source B34 and steam, the high-pressure start bypass valve 1 is gradually closed.
Under the working condition, the bypass system is started at high pressure, so that the high-pressure steam source A can be smoothly started, the working medium is recovered, and the high-pressure steam source A and the high-pressure steam source B can be used for combining steam, so that the requirement of pushing the high-pressure cylinder to do work together is met.
S3: high-pressure steam source B34 starting working condition
When the high-pressure steam source B34 is started, the operation mode of the related valve is similar to that of the high-pressure steam source A33.
S4: low pressure steam source A35 starting condition
When the low-pressure steam source A35 is started, the shutoff valve C11 and the shutoff valve J21 are closed, the shutoff valve D12, the shutoff valve G18 and the low-pressure start bypass valve 10 are opened, and the vacuum shutoff valve C13 or the vacuum shutoff valve D14 is opened along with the related operation condenser. At this time, the steam at the outlet of the low-pressure steam source A35 is discharged into the condenser through the shutoff valve G18, the shutoff valve D12, the low-pressure start bypass valve 10 and the vacuum shutoff valve C13 or the vacuum shutoff valve D14.
After the steam parameters meet the low pressure cylinder steam inlet requirements, the shut-off valve J21 is opened, steam enters the steam header 37 and then the low pressure cylinder, and the low pressure start bypass valve 10 is gradually closed.
Under the working condition, the low-pressure starting bypass system can realize the smooth starting of the low-pressure steam source A, and can recover working media and meet the requirement that steam generated by the low-pressure steam source A enters the low-pressure cylinder to do work.
S5: low pressure steam source B36 starting condition
When the low-pressure steam source B36 is started, the shutoff valve D12 and the shutoff valve I20 are closed, the shutoff valve C11, the shutoff valve H19 and the low-pressure starting bypass valve 10 are opened, and the vacuum shutoff valve C13 or the vacuum shutoff valve D14 is opened along with the related operation condenser. At this time, the steam at the outlet of the low-pressure steam source B36 is discharged into the condenser through the shutoff valve H19, the shutoff valve C11, the low-pressure start bypass valve 10 and the vacuum shutoff valve C13 or the vacuum shutoff valve D14.
After the steam parameters meet the low pressure cylinder steam inlet requirements, the shutoff valve I20 is opened, steam enters the steam header 37 and then enters the low pressure cylinder, and the low pressure start bypass valve 10 is gradually closed.
Under the working condition, the low-pressure starting bypass system can realize the smooth starting of the low-pressure steam source B, and can recover working media and meet the requirement that steam generated by the low-pressure steam source B enters the low-pressure cylinder to do work.
S6: high pressure cylinder 28 failure condition
When the high-pressure cylinder fails, the high-pressure main valve 23, the high-pressure cylinder exhaust butterfly valve 26 and the high-pressure cylinder exhaust check valve 27 are closed, the high-pressure backup bypass valve 7 is opened, and steam is discharged to the steam header 37 through the high-pressure backup bypass valve 7.
Under the working condition, the high-pressure steam source can normally operate when the high-pressure cylinder is stopped through the high-pressure standby bypass, and the high-pressure steam absorption requirement is met.
S7: failure condition of low pressure cylinder
When the low-pressure cylinder A29 fails, the low-pressure main valve A24 is closed, the low-pressure standby bypass valve A8 is opened, and steam is discharged to the condenser A31 through the low-pressure standby bypass valve A8;
when the low-pressure cylinder B30 fails, the low-pressure main valve B25 is closed, the low-pressure standby bypass valve B9 is opened, and steam is discharged to the condenser B32 through the low-pressure standby bypass valve B9.
Under the working condition, the high-pressure steam source and the low-pressure steam source can normally operate when any low-pressure cylinder is stopped through the low-pressure standby bypass, and the low-pressure steam absorption requirement is met
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A bypass system of a double-steam-inlet-parameter multi-shaft turbine unit is characterized in that:
comprising the following steps:
the high-pressure starting bypass is characterized in that an output pipeline of a first high-pressure steam source is divided into a first high-pressure output pipeline and a second high-pressure output pipeline, the output pipeline of the second high-pressure steam source is divided into a third output pipeline and a fourth output pipeline, the second high-pressure output pipeline and the fourth output pipeline are converged into a first main pipeline, a first shutoff valve is arranged on the second high-pressure output pipeline, a second shutoff valve is arranged on the fourth output pipeline, a high-pressure starting bypass valve and a first safety valve are arranged on the first main pipeline, the first main pipeline is divided into a first branch pipe communicated with a first condenser and a second branch pipe communicated with a second condenser, a first vacuum shutoff valve is arranged on the first branch pipe, and a second vacuum shutoff valve is arranged on the second branch pipe;
high pressure backup bypass: the first high-pressure output pipeline and the third output pipeline are converged into a second main pipe, a fifth shutoff valve is arranged on the first high-pressure output pipeline, a sixth shutoff valve is arranged on the second high-pressure output pipeline, the second main pipe is divided into a third branch pipe and a fourth branch pipe, the third branch pipe is communicated with a steam header, and the fourth branch pipe is communicated with a high-pressure cylinder through a high-pressure main steam valve;
low pressure start-up bypass: the output pipeline of the first low-pressure steam source is divided into a first low-pressure output pipeline and a second low-pressure output pipeline, the output pipeline of the second low-pressure steam source is divided into a third low-pressure output pipeline and a fourth low-pressure output pipeline, the first low-pressure output pipeline is communicated with the steam header after passing through a ninth shut-off valve, the third low-pressure output pipeline is communicated with the steam header after passing through a tenth shut-off valve, the second low-pressure output pipeline and the fourth low-pressure output pipeline are converged into a third main pipe, the third main pipe is divided into a fifth branch pipe and a sixth branch pipe after passing through a low-pressure start bypass valve, the fifth branch pipe is communicated with the first condenser through a third vacuum valve, the sixth branch pipe is communicated with the second condenser through a fourth vacuum valve, and the third main pipe is communicated with the second low-pressure cylinder through a branch pipe;
low pressure backup bypass: the first condenser is communicated with the steam header through a first low-pressure standby bypass valve, and the second condenser is communicated with the steam header through a second low-pressure standby bypass valve.
2. The dual-admission parameter multi-shaft turbine unit bypass system of claim 1, wherein:
the communicating pipe of the first low pressure cylinder and the steam header is provided with a first low pressure main valve, and the communicating pipe of the second low pressure cylinder and the steam header is provided with a second low pressure main valve.
3. The dual-admission parameter multi-shaft turbine unit bypass system of claim 1, wherein:
the output pipeline of the high-pressure cylinder is divided into a first high-pressure cylinder output pipeline and a second high-pressure cylinder output pipeline, the first high-pressure cylinder output pipeline is communicated with an eleventh shutoff valve for emptying, the second high-pressure cylinder output pipeline is communicated with a steam header, and the second high-pressure cylinder output pipeline is provided with a high-pressure cylinder steam discharge check valve and a high-pressure cylinder steam discharge butterfly valve which are connected in series.
4. A method of operating a double-inlet parameter multi-shaft turbine unit bypass system according to any one of claims 1 to 3, characterized by:
the normal operating condition of the unit includes:
the high-pressure starting bypass valve, the high-pressure standby bypass valve, the first shutoff valve, the second shutoff valve, the first vacuum shutoff valve, the second vacuum shutoff valve, the low-pressure starting bypass valve, the first low-pressure standby bypass valve, the second low-pressure standby bypass valve, the third shutoff valve, the fourth shutoff valve, the third vacuum shutoff valve, the fourth vacuum shutoff valve, the first safety valve and the second safety valve are all opened.
5. The method of operation of claim 4, wherein:
the first high-pressure steam source starting condition includes:
when the first high-pressure steam source is started, the fifth shutoff valve and the second shutoff valve are closed, the first shutoff valve and the high-pressure starting bypass valve are opened, and the first vacuum shutoff valve or the second vacuum shutoff valve is opened along with a related operation condenser; the steam at the outlet of the first high-pressure steam source is discharged into the condenser through the first shutoff valve, the high-pressure starting bypass valve and the first vacuum shutoff valve or the second vacuum shutoff valve.
6. The method of operation of claim 5, wherein:
when the second high pressure steam source is not operating, comprising:
when the steam parameters meet the starting requirement of the high-pressure cylinder, the high-pressure main valve is opened, and the high-pressure starting bypass valve is gradually closed;
if the low pressure cylinder does not operate, the high pressure cylinder steam exhaust check valve and the high pressure cylinder steam exhaust butterfly valve are opened along with the high pressure main valve, if the first low pressure cylinder is to be started, the first low pressure standby bypass valve is opened, after the steam parameters meet the low pressure cylinder starting conditions, the first low pressure main valve is opened, and the first low pressure standby bypass valve is gradually closed;
if the low-pressure cylinder is operated, the high-pressure cylinder exhaust check valve and the high-pressure cylinder exhaust butterfly valve are closed, the eleventh shutoff valve is opened, and the high-pressure cylinder exhaust is discharged to the air; after the steam parameters meet the starting conditions of the low-pressure cylinder, a steam discharge check valve of the high-pressure cylinder and a steam discharge butterfly valve of the high-pressure cylinder are opened, an eleventh shutoff valve is closed, and steam discharged by the high-pressure cylinder enters a steam header;
when the second high-pressure steam source is operated, the high-pressure start bypass valve is gradually closed after the steam parameters meet the steam merging requirement of the second high-pressure steam source.
7. The method of operation of claim 5, wherein:
the first low pressure steam source start-up operating mode includes:
when the first low-pressure steam source is started, the third shut-off valve and the tenth shut-off valve are closed, the fourth shut-off valve, the seventh shut-off valve and the low-pressure start bypass valve are opened, and the third vacuum shut-off valve or the fourth vacuum shut-off valve is opened along with the related operation condenser; the steam at the outlet of the first low-pressure steam source is discharged into a condenser through a seventh shut-off valve, a fourth shut-off valve, a low-pressure starting bypass valve and a third vacuum shut-off valve or a fourth vacuum shut-off valve;
after the steam parameters meet the steam inlet requirements of the low-pressure cylinder, the tenth shutoff valve is opened, steam enters the steam header and then enters the low-pressure cylinder, and the low-pressure starting bypass valve is gradually closed.
8. The method of operation of claim 5, wherein:
when the second low-pressure steam source is started, the fourth shut-off valve and the ninth shut-off valve are closed, the third shut-off valve, the eighth shut-off valve and the low-pressure start bypass valve are opened, and the third vacuum shut-off valve or the fourth vacuum shut-off valve is opened along with the related operation condenser; the steam at the outlet of the second low-pressure steam source is discharged into a condenser through an eighth shut-off valve, a third shut-off valve, a low-pressure starting bypass valve and a third vacuum shut-off valve or a fourth vacuum shut-off valve;
after the steam parameters meet the steam inlet requirements of the low-pressure cylinder, the ninth shutoff valve is opened, steam enters the steam header and then enters the low-pressure cylinder, and the low-pressure starting bypass valve is gradually closed.
9. The method of operation of claim 4, wherein:
high pressure cylinder fault conditions include:
when the high-pressure cylinder fails, the high-pressure main valve, the high-pressure cylinder steam discharge butterfly valve and the high-pressure cylinder steam discharge check valve are closed, the high-pressure standby bypass valve is opened, and steam is discharged to the steam header through the high-pressure standby bypass valve.
10. The method of operation of claim 4, wherein:
low pressure cylinder fault conditions include:
when the first low-pressure cylinder fails, the first low-pressure main valve is closed, the first low-pressure standby bypass valve is opened, and steam is discharged to the first condenser through the first low-pressure standby bypass valve;
when the second low-pressure cylinder fails, the second low-pressure main valve is closed, the second low-pressure standby bypass valve is opened, and steam is discharged to the second condenser through the second low-pressure standby bypass valve.
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| JPS6336004A (en) * | 1986-07-29 | 1988-02-16 | Toshiba Corp | Method for starting steam turbine plant |
| CN203796333U (en) * | 2014-04-18 | 2014-08-27 | 国电科学技术研究院 | Ultra-supercritical double reheat bypass system for double-shaft steam turbine |
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| CN114508773A (en) * | 2021-12-29 | 2022-05-17 | 东方电气集团东方汽轮机有限公司 | Flexible high-back-pressure heat supply system and heat supply method thereof |
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2022
- 2022-06-10 CN CN202210652650.9A patent/CN115013083B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6336004A (en) * | 1986-07-29 | 1988-02-16 | Toshiba Corp | Method for starting steam turbine plant |
| CN203796333U (en) * | 2014-04-18 | 2014-08-27 | 国电科学技术研究院 | Ultra-supercritical double reheat bypass system for double-shaft steam turbine |
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| CN113669117A (en) * | 2021-08-24 | 2021-11-19 | 西安热工研究院有限公司 | Steam turbine bypass coupling low-pressure cylinder zero-output heat supply system and method for improving operation flexibility of heat supply unit |
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