CN115013083A - Double-steam-inlet-parameter multi-shaft steam turbine unit bypass system and working method - Google Patents
Double-steam-inlet-parameter multi-shaft steam turbine unit bypass system and working method Download PDFInfo
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- CN115013083A CN115013083A CN202210652650.9A CN202210652650A CN115013083A CN 115013083 A CN115013083 A CN 115013083A CN 202210652650 A CN202210652650 A CN 202210652650A CN 115013083 A CN115013083 A CN 115013083A
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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 double-steam-admission parameter multi-shaft steam turbine unit bypass system, 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 various starting working condition requirements 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 a heating surface of the steam source; the requirements of starting and operating conditions of each cylinder of three turbines, namely a high-pressure cylinder, a first low-pressure cylinder and a 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 during faults can be met; when the unit is started and stopped, the working medium is recovered, and the noise is reduced; before the steam turbine is flushed, a clean steam-water circulating system is established, and the steam turbine is introduced after the steam purity reaches a specified standard, so that the steam turbine is prevented from being polluted.
Description
Technical Field
The invention relates to the technical field of steam turbine unit bypass systems, in particular to a double-steam-admission-parameter multi-shaft steam turbine unit bypass system and a working method.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
The bypass system is a steam system which is used for bypassing the steam turbine by connecting superheated steam transmitted from a steam source to the outlet of a steam turbine cylinder through a temperature and pressure reducing device without entering or not completely entering the steam turbine. The bypass system is mainly used for coordinating the imbalance between the steam source and the steam amount of the steam turbine. And during the unit starting period, accelerating the starting speed of the steam source. When the steam turbine set is used for load shedding, the residual steam passes through the bypass system, so that the steam source transient transition working condition is stable in operation, the starting and load carrying characteristics are improved, the service life consumption of the set is reduced, and the operation safety and economy are improved.
The inventor finds that the matching working condition of a steam source and a steam turbine set is complex for a multi-shaft steam turbine generator set with double steam inlet parameters, particularly when the set is started and fails, multi-valve cooperation control is needed, and a characteristic bypass system of the multi-shaft steam turbine generator set with the double steam inlet parameters does not exist in the prior art.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a double-steam-inlet-parameter multi-shaft steam turbine unit bypass system and a working method thereof, which can meet various starting working condition requirements of 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 other steam sources, and can protect the safety of a heating surface of the steam source.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a bypass system of a double-steam-admission parameter multi-shaft steam turbine unit.
A dual steam admission parameter multiple shaft steam 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, an output pipeline of a 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 pipe, 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 pipe, the first main pipe is divided into a first branch pipe communicated with a first condenser and a second branch pipe communicated with the 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 standby 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 the steam header, and the fourth branch pipe is communicated with the high-pressure cylinder through a high-pressure main steam valve;
a low-pressure start 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 pipeline, the third main pipeline is divided into a fifth branch pipe and a sixth branch pipe after passing through a low-pressure starting 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, the third main pipeline is communicated with the second low-pressure cylinder through a branch pipeline, and a second safety valve is arranged on the branch pipeline;
low-voltage standby 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.
Furthermore, a first low-pressure main valve is arranged on a communicating pipeline of the first low-pressure cylinder and the steam header, and a second low-pressure main valve is arranged on a communicating pipeline of the second low-pressure cylinder and the steam header.
Furthermore, an 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 a high-pressure cylinder steam exhaust check valve and a high-pressure cylinder steam exhaust butterfly valve which are connected in series are arranged on the second high-pressure cylinder output pipeline.
The second aspect of the present invention provides a working method of the bypass system of the dual steam inlet parameter multiple-shaft steam turbine unit according to the first aspect, wherein the normal operation 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, and the rest valves are all opened.
Further, the first high-pressure steam source starting working condition comprises the following steps:
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 the related operation condenser; and 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 operated, the method comprises the following steps:
when the steam parameters meet the starting requirement of the high-pressure cylinder, the high-pressure main throttle 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, and after steam parameters meet the starting conditions of the low-pressure cylinder, 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 steam exhaust check valve and the high-pressure cylinder steam exhaust butterfly valve are closed, the eleventh shut-off valve is opened, and the high-pressure cylinder steam exhaust is exhausted to the air; after the steam parameters meet the starting conditions of the low-pressure cylinder, the high-pressure cylinder steam exhaust check valve and the high-pressure cylinder steam exhaust butterfly valve are opened, the eleventh shut-off valve is closed, and the high-pressure cylinder steam exhaust enters the steam header;
when the second high-pressure steam source is operated, the high-pressure starting bypass valve is gradually closed after the steam parameters meet the steam merging requirement with the second high-pressure steam source.
Further, the first low-pressure steam source starting working condition comprises:
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 starting 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; steam at the outlet of the first low-pressure steam source is discharged into the 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;
and after the steam parameters meet the steam inlet requirement of the low-pressure cylinder, opening the tenth shutoff valve, allowing the steam to enter the steam header and then enter the low-pressure cylinder, and gradually closing the low-pressure starting bypass valve.
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 starting 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; steam at the outlet of the second low-pressure steam source is discharged into the 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;
and after the steam parameters meet the steam inlet requirement of the low-pressure cylinder, opening the ninth shutoff valve, introducing steam into the steam header and then the low-pressure cylinder, and gradually closing the low-pressure starting bypass valve.
Further, the high-pressure cylinder fault condition includes:
when the high-pressure cylinder fails, the high-pressure main valve, the high-pressure cylinder steam exhaust butterfly valve and the high-pressure cylinder steam exhaust check valve are closed, the high-pressure standby bypass valve is opened, and steam is exhausted to the steam header through the high-pressure standby bypass valve.
Further, low pressure cylinder failure conditions
When the first low-pressure cylinder fails, the first low-pressure main throttle 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 steam 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 double-steam-inlet-parameter multi-shaft steam turbine unit bypass system and the working method can meet various starting working condition requirements 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 surface of the steam source.
2. The double-steam-inlet-parameter multi-shaft steam turbine unit bypass system and the working method can meet the requirements of each cylinder starting and operating condition of three steam turbines including the high pressure cylinder, the first low pressure cylinder and the second low pressure cylinder, shorten the starting time of the unit, and reduce the damage of the steam turbines.
3. The double-steam-inlet-parameter multi-shaft steam turbine unit bypass system and the working method can meet the steam consumption requirements when different steam turbines are in failure.
4. The double-steam-inlet-parameter multi-shaft steam turbine unit bypass system and the working method have the advantages that when the unit is started and stopped, the working medium is recycled, and the noise is reduced.
5. According to the double-steam-admission-parameter multi-shaft steam turbine unit bypass system and the working method, before the steam turbine is subjected to impact rotation, a clean steam-water circulating system is established, and the steam turbine is introduced after the steam purity reaches a specified standard, so that the steam turbine is prevented from being polluted.
Advantages of 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 incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic structural diagram of a bypass system of a dual steam admission parameter multi-shaft steam turbine unit according to an embodiment of the present invention.
Wherein, 1, starting the bypass valve at high pressure; 2. closing the valve A; 3. closing the 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 backup bypass valve A; 9. a low pressure backup bypass valve B; 10. a low pressure start bypass valve; 11. closing the valve C; 12. closing the valve D; 13. a vacuum shut-off valve C; 14. a vacuum shut-off valve D; 15. a safety valve B; 16. closing the valve E; 17. closing the valve F; 18. closing the valve G; 19. closing the valve H; 20. closing the valve I; 21. closing the valve J; 22. closing the 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 steam exhaust butterfly valve; 27. a high-pressure cylinder steam 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. and (4) a steam header.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. 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 invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
Example 1:
as shown in fig. 1, embodiment 1 of the present invention provides a dual steam admission parameter multi-shaft steam turbine unit bypass system, including:
a high-pressure starting bypass: the high pressure start by-pass valve 1 is selected to have 30% of the capacity of the high pressure steam source a33 (i.e., the first high pressure steam source). A branch pipe is connected from the front of a high-pressure steam source outlet shutoff valve E16 (namely a fifth shutoff valve) and a shutoff valve F17 (namely a sixth shutoff valve), and is converged into a first main pipe after passing through a shutoff valve A2 (namely a first shutoff valve) and a 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 is divided into branch pipes which are connected to a condenser A31 (namely a first condenser) and a condenser B32 (namely a second condenser), 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 standby bypass: the high pressure backup bypass valve 7 is selected according to 100% capacity of the high pressure cylinder 28, the piping is connected to the steam header 37 from the main steam piping before the high pressure main valve, and the high pressure backup bypass valve 7 is provided.
The first high-pressure output pipeline and the third output pipeline are converged into a second main pipe, a shut-off valve E16 is arranged on the first high-pressure output pipeline, a shut-off valve F17 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 the steam header, and the fourth branch pipe is communicated with the high-pressure cylinder 28 through the high-pressure main steam valve 23.
A low-pressure start bypass: the low-pressure starting bypass valve 10 is selected according to 30% of capacity of a low-pressure steam source A35, a branch pipe is connected in front of a self-closing valve I20 (namely, a ninth closing valve) and a closing valve J21 (namely, a tenth closing valve) and is converged into a third main pipe after passing through a closing valve C11 (namely, a third closing valve) and a closing valve D12 (namely, a fourth closing valve) respectively, the third main pipe is provided with the low-pressure starting bypass valve 10 and a safety valve B15 (namely, a second safety valve), and then the branch pipes are connected to a condenser A31 (namely, a first condenser) and a condenser B32 (namely, a second condenser), and the two branch pipes are provided with a vacuum closing valve C13 (namely, a third vacuum closing valve) and a vacuum closing valve D14 (namely, a fourth vacuum closing valve) respectively.
Low-voltage standby bypass: the low-pressure backup bypass valve is selected according to 100% capacity of the low-pressure cylinder, and pipelines from the steam header to the condenser A31 and the condenser B32 are respectively provided with a low-pressure backup bypass valve A8 (namely, a first low-pressure backup bypass valve) and a low-pressure backup bypass valve B9 (namely, a second low-pressure backup bypass valve).
A low-pressure main valve a24 (i.e., a first low-pressure main valve) is arranged on a communication 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 communication 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, the first high-pressure cylinder output pipeline is communicated with a shutoff valve K22 (namely an eleventh shutoff valve) for evacuation, 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 27 and a high-pressure cylinder steam exhaust 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 start bypass valve 1, the high-pressure backup bypass valve 7, the shut-off valve a2, the shut-off valve B3, the vacuum shut-off valve a4, the vacuum shut-off valve B5, the low-pressure start bypass valve 10, the low-pressure backup bypass valve A8, the low-pressure backup bypass valve B9, the shut-off valve C11, the shut-off valve D12, the vacuum shut-off valve C13, the vacuum shut-off valve D14, the safety valve a6, and the safety valve B15 are closed, and the remaining valves are all open.
Under the working condition, the bypass system is standby and is not used.
S2: starting condition of high-pressure steam source A33
When the high-pressure steam source A33 is started, the shut-off valve E16 and the shut-off valve B3 are closed, the shut-off valve A2 and the high-pressure starting bypass valve 1 are opened, and the vacuum shut-off valve A4 or the vacuum shut-off valve B5 is opened along with the related operation condenser. At the moment, steam at the outlet of the high-pressure steam source A33 is discharged into the condenser through a shutoff valve A2, the high-pressure starting bypass valve 1 and the vacuum shutoff valve A4 or the vacuum shutoff 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 meet the requirement of the starting of the high-pressure cylinder on steam while recycling the working medium.
When the steam parameters meet the starting requirement of the high-pressure cylinder, 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 exhaust check valve 27 and the high pressure cylinder steam exhaust 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, and after 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 requirement of the low-pressure cylinder on steam starting can be met while the working medium can be recycled through the low-pressure standby bypass system.
S2.1.2: if the low-pressure cylinder is operated, the high-pressure cylinder steam exhaust check valve 27 and the high-pressure cylinder steam exhaust butterfly valve 26 are closed, the shut-off valve K22 is opened, and the high-pressure cylinder steam exhaust is exhausted in an empty mode; after the steam parameters meet the starting conditions of the low-pressure cylinder, the high-pressure cylinder steam exhaust check valve 27 and the high-pressure cylinder steam exhaust butterfly valve 26 are opened, the shut-off valve K22 is closed, and the high-pressure cylinder steam exhaust enters the steam header 37.
Under the working condition, the high-pressure cylinder exhaust steam and the low-pressure main steam are matched in parameter through the high-pressure cylinder to air exhaust steam system, so that the requirement of jointly pushing the low-pressure cylinder to do work is met.
S2.2: when the high-pressure steam source B34 is operated
When the steam parameter meets the requirement of merging with the high-pressure steam source B34, the high-pressure starting bypass valve 1 is gradually closed.
Under the working condition, the high-pressure starting bypass system can realize the smooth starting of the high-pressure steam source A, and can realize the steam combination of the high-pressure steam source A and the high-pressure steam source B while recovering the working medium so as to meet the requirement of jointly pushing the high-pressure cylinder to do work.
S3: starting condition of high-pressure steam source B34
When the high-pressure steam source B34 is started, the operation mode of the relevant 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 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 the moment, steam at the outlet of the low-pressure steam source A35 is discharged into the condenser through a shutoff valve G18, a shutoff valve D12, the low-pressure starting bypass valve 10 and a vacuum shutoff valve C13 or a vacuum shutoff valve D14.
After the steam parameters meet the steam inlet requirement of the low-pressure cylinder, the shut-off valve J21 is opened, the steam enters the steam header 37 and then enters the low-pressure cylinder, and the low-pressure starting 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 meet the requirement that steam generated by the low-pressure steam source A enters the low-pressure cylinder to do work while recycling the working medium.
S5: low pressure steam source B36 starting condition
When the low-pressure steam source B36 is started, the shut-off valve D12 and the shut-off valve I20 are closed, the shut-off valve C11, the shut-off valve H19 and the low-pressure starting bypass valve 10 are opened, and the vacuum shut-off valve C13 or the vacuum shut-off valve D14 is opened along with the related operation condenser. At the moment, steam at the outlet of the low-pressure steam source B36 is discharged into the condenser through a shutoff valve H19, a shutoff valve C11, a low-pressure starting bypass valve 10, a vacuum shutoff valve C13 or a vacuum shutoff valve D14.
After the steam parameters meet the steam inlet requirement of the low-pressure cylinder, the shut-off valve I20 is opened, the steam enters the steam header 37 and then enters the low-pressure cylinder, and the low-pressure starting 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 meet the requirement that steam generated by the low-pressure steam source B enters the low-pressure cylinder to do work while recycling the working medium.
S6: high pressure cylinder 28 fault condition
When the high-pressure cylinder fails, the high-pressure main valve 23, the high-pressure cylinder steam exhaust butterfly valve 26 and the high-pressure cylinder steam exhaust check valve 27 are closed, the high-pressure standby bypass valve 7 is opened, and steam is exhausted to the steam header 37 through the high-pressure standby bypass valve 7.
Under this operating mode, through the reserve bypass of high pressure, can realize high-pressure steam source normal operating when the high-pressure jar shuts down, satisfy the high-pressure steam and absorb the demand.
S7: fault condition of low pressure cylinder
When the low-pressure cylinder A29 has a fault, 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 has a fault, 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 shut down through the low-pressure standby bypass, and the low-pressure steam consumption requirement is met
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a two admission parameters multiaxis steam turbine unit bypass system which characterized in that:
the method comprises the following steps:
the high-pressure steam turbine comprises a high-pressure starting bypass, a first condenser, a second condenser, a first branch pipe, a second branch pipe, a first vacuum shutoff valve, a second vacuum shutoff valve, a third vacuum shutoff valve, a fourth vacuum bypass and a fourth vacuum shutoff valve, a fourth vacuum bypass and a third vacuum bypass and a fourth vacuum shutoff valve and a fourth vacuum bypass and a third vacuum bypass and a fourth vacuum bypass;
high-pressure standby 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 the steam header, and the fourth branch pipe is communicated with the high-pressure cylinder through a high-pressure main steam valve;
a low-pressure start 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 pipeline, the third main pipeline is divided into a fifth branch pipe and a sixth branch pipe after passing through a low-pressure starting 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, the third main pipeline is communicated with the second low-pressure cylinder through a branch pipeline, and a second safety valve is arranged on the branch pipeline;
low-voltage standby 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 multiple shaft steam turbine unit bypass system according to claim 1 wherein:
a first low-pressure main valve is arranged on a communicating pipeline of the first low-pressure cylinder and the steam header, and a second low-pressure main valve is arranged on a communicating pipeline of the second low-pressure cylinder and the steam header.
3. The dual admission parameter multiple shaft steam turbine unit bypass system according to 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 a high-pressure cylinder steam exhaust check valve and a high-pressure cylinder steam exhaust butterfly valve which are connected in series are arranged on the second high-pressure cylinder output pipeline.
4. A method of operating a dual admission parameter multiple shaft steam turbine unit bypass system according to any one of claims 1 to 3, characterized by:
the normal operating condition of 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, and the rest valves are all opened.
5. The method of operation of claim 4, wherein:
the first high-pressure steam source starting working condition comprises the following steps:
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 the related operation condenser; and 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 operated, the method comprises the following steps:
when the steam parameters meet the starting requirement of the high-pressure cylinder, the high-pressure main throttle 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, and after steam parameters meet the starting conditions of the low-pressure cylinder, 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 steam exhaust check valve and the high-pressure cylinder steam exhaust butterfly valve are closed, the eleventh shut-off valve is opened, and the high-pressure cylinder steam exhaust is exhausted to the air; after the steam parameters meet the starting conditions of the low-pressure cylinder, the high-pressure cylinder steam exhaust check valve and the high-pressure cylinder steam exhaust butterfly valve are opened, the eleventh shut-off valve is closed, and the high-pressure cylinder steam exhaust enters the steam header;
when the second high-pressure steam source is operated, the high-pressure starting bypass valve is gradually closed after the steam parameters meet the steam merging requirement with the second high-pressure steam source.
7. The method of operation of claim 5, wherein:
a first low pressure steam source start-up condition comprising:
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 starting 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; steam at the outlet of the first low-pressure steam source is discharged into the 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;
and after the steam parameters meet the steam inlet requirement of the low-pressure cylinder, opening the tenth shutoff valve, allowing the steam to enter the steam header and then enter the low-pressure cylinder, and gradually closing the low-pressure starting bypass valve.
8. The method of operation of claim 5, wherein:
when the second low-pressure steam source is started, the fourth shutoff valve and the ninth shutoff valve are closed, the third shutoff valve, the eighth shutoff valve and the low-pressure starting bypass valve are opened, and the third vacuum shutoff valve or the fourth vacuum shutoff valve is opened along with the related operation condenser; steam at the outlet of the second low-pressure steam source is discharged into the 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;
and after the steam parameters meet the steam inlet requirement of the low-pressure cylinder, opening the ninth shutoff valve, introducing steam into the steam header and then the low-pressure cylinder, and gradually closing the low-pressure starting bypass valve.
9. The method of operation of claim 4, wherein:
high pressure cylinder trouble operating mode includes:
when the high-pressure cylinder fails, the high-pressure main valve, the high-pressure cylinder steam exhaust butterfly valve and the high-pressure cylinder steam exhaust check valve are closed, the high-pressure standby bypass valve is opened, and steam is exhausted 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 throttle 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 steam 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 |
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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
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| 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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