CN112282867A - Method for solving EH oil pipeline vibration caused by primary frequency modulation of steam turbine - Google Patents
Method for solving EH oil pipeline vibration caused by primary frequency modulation of steam turbine Download PDFInfo
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- CN112282867A CN112282867A CN202011103640.7A CN202011103640A CN112282867A CN 112282867 A CN112282867 A CN 112282867A CN 202011103640 A CN202011103640 A CN 202011103640A CN 112282867 A CN112282867 A CN 112282867A
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- steam turbine
- pressure regulating
- regulating valve
- opening
- valve
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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
- F01D17/12—Final actuators arranged in stator parts
- F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
- F01D17/141—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path
- F01D17/145—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path by means of valves, e.g. for steam turbines
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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
-
- 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
- F01D25/04—Antivibration arrangements
Abstract
The invention discloses a method for solving the problem of EH oil pipeline vibration caused by primary frequency modulation of a steam turbine, which comprises the following steps: and (3) making a change curve of the relative flow and the relative opening of each high-pressure regulating valve, determining a saturation area of each high-pressure regulating valve, setting the opening time of the next high-pressure regulating valve, and reducing the opening rising rate of the valve in the saturation area. According to the invention, a change curve of the relative flow and the relative opening of the high-pressure regulating valve of the steam turbine is obtained through a steam turbine flow characteristic test, then the position of a saturation region in the change curve is determined, the opening time of the next high-pressure regulating valve is set, the next high-pressure regulating valve is opened slightly before the previous high-pressure regulating valve enters the saturation region, and finally the valve opening and rising rate of the saturation region is reduced, so that the action amplitude of the high-pressure regulating valve of the steam turbine is reduced, the response speed of primary frequency modulation is improved, EH oil pipeline vibration generated during primary frequency modulation is basically eliminated, and the unplanned shutdown of a generator set caused by damage and oil leakage of the EH.
Description
Technical Field
The invention relates to the technical field of primary frequency modulation of a steam turbine, in particular to a method for solving EH oil pipeline vibration caused by primary frequency modulation of the steam turbine.
Background
The response requirement of a power grid on the primary frequency modulation of a steam turbine in the power grid is higher and higher, the steam turbine frequently performs primary frequency modulation action, a servomotor of a steam turbine steam inlet throttle performs frequent and large opening and closing actions, an EH oil pipe is a pipeline for providing power oil for the steam turbine steam inlet throttle and is connected with the servomotor, EH oil in an oil pipeline is frequently and quickly throttled and released if the action amplitude of the servomotor is too large during primary frequency modulation, the flow speed of the EH oil in the pipeline is rapidly changed, so that the pipeline vibration is obvious, great potential safety hazards exist, the EH oil pipeline is damaged and leaks oil, the steam turbine generator unit is caused to be unplanned to stop running, impact is caused on the power grid, and the power supply quality.
Disclosure of Invention
In view of the above disadvantages, the present invention provides a method for solving the vibration of the EH oil pipeline caused by the primary frequency modulation of the steam turbine, which reduces the actuation amplitude of the high-pressure throttle of the steam turbine, increases the response speed of the primary frequency modulation, and eliminates the vibration of the EH oil pipeline generated during the primary frequency modulation.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a method for solving the problem of EH oil pipeline vibration caused by primary frequency modulation of a steam turbine comprises the following steps:
s1: respectively manufacturing change curves of the relative flow and the relative opening of high-pressure regulating gates GV1, GV2, GV3 and GV4 of the steam turbine;
s2: determining a saturation area of a change curve of the relative flow and the relative opening of each high-pressure regulating valve;
s3: setting the opening time of the next high-pressure regulating valve to enable the next high-pressure regulating valve to be opened slightly before the previous high-pressure regulating valve enters a saturation area;
s4: and the valve opening rising rate of the saturation area is reduced, and the action amplitude of the oil engine is reduced.
Preferably, the specific process of step S1 is as follows:
s11: keeping the load of the steam turbine stable at about 90%;
s12: switching a control mode of a high-pressure regulating valve of the steam turbine to full-circle steam admission, and switching the high-pressure regulating valve of the steam turbine to manual operation after the opening degrees of 4 high-pressure regulating valves are consistent;
s13: the GV1 throttle valve is slowly closed, and the fuel quantity of the boiler is adjusted in the closing process, so that the main steam pressure of the steam turbine is ensured to be stable;
s14: recording the corresponding relation between the steam flow of the unit and the valve position of a high-pressure regulating valve GV1 of the steam turbine;
s15: the GV1 is slowly opened to be consistent with the opening degree of other high-pressure valves;
s16: obtaining a change curve of the relative opening degree and the relative flow of the high-pressure regulating valve GV1 of the steam turbine through a steam turbine flow characteristic test;
s17: in the same way, the change curves of the relative opening degree and the relative flow of the high-pressure valves GV2, GV3 and GV4 are obtained.
Preferably, in step S2, when the opening of the high pressure throttle is increased and the steam inlet flow rate is not significantly increased, the steam enters the saturation region.
Preferably, in step S3, the opening timing of the next high-pressure valve in the sequence valve mode is set according to the opening degree of the saturation point of each altitude valve.
The invention has the beneficial effects that: according to the invention, a change curve of the relative flow and the relative opening of the high-pressure regulating valve of the steam turbine is obtained through a steam turbine flow characteristic test, then the position of a saturation region in the change curve is determined, the opening time of the next high-pressure regulating valve is set, the next high-pressure regulating valve is opened slightly before the previous high-pressure regulating valve enters the saturation region, and finally the valve opening and rising rate of the saturation region is reduced, so that the action amplitude of the high-pressure regulating valve of the steam turbine is reduced, the response speed of primary frequency modulation is improved, EH oil pipeline vibration generated during primary frequency modulation is basically eliminated, and the unplanned shutdown of a generator set caused by damage and oil leakage of the EH.
The invention is further described with reference to the following figures and examples.
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 principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a graph of the relative opening degree and the relative flow variation of GV1 obtained by a turbine flow characteristic test according to the present invention;
FIG. 2 is a graph of the integrated valve position and relative opening of a high pressure regulator valve after use of the present invention;
FIG. 3 is a graph comparing the amplitude of vibration of EH oil conduits before and after use of the present invention.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Example 1:
referring to fig. 1 to 3, a method for solving vibration of an EH oil pipeline caused by primary frequency modulation of a steam turbine includes the following steps:
s1: respectively manufacturing change curves of the relative flow and the relative opening of high-pressure regulating gates GV1, GV2, GV3 and GV4 of the steam turbine;
s2: determining a saturation area of a change curve of the relative flow and the relative opening of each high-pressure regulating valve, wherein when the opening of the high-pressure regulating valve is increased and the steam inlet flow is not obviously increased, the high-pressure regulating valve enters the saturation area, and as shown in fig. 1, when the opening is more than 43 percent, the high-pressure regulating valve enters the saturation area;
s3: setting the opening time of the next high-pressure regulating valve according to the opening degree of the saturation point of each height regulating valve, so that the next high-pressure regulating valve is opened slightly before the previous high-pressure regulating valve enters a saturation area;
s4: after the gasoline engine enters the saturation region, the increasing effect of the opening degree of the steam inlet high-pressure regulating valve on the steam inlet flow is not obvious, so that the valve opening degree slope of the saturation region (for example, after the opening degree of GV1 is greater than 43%) is reduced, and the action amplitude of the gasoline engine is reduced.
The specific process of step S1 is as follows:
s11: keeping the load of the steam turbine stable at about 90%;
s12: switching a control mode of a high-pressure regulating valve of the steam turbine to full-circle steam admission, and switching the high-pressure regulating valve of the steam turbine to manual operation after the opening degrees of 4 high-pressure regulating valves are consistent;
s13: the GV1 throttle valve is slowly closed, and the fuel quantity of the boiler is adjusted in the closing process, so that the main steam pressure of the steam turbine is ensured to be stable;
s14: recording the corresponding relation between the steam flow of the unit and the valve position of a high-pressure regulating valve GV1 of the steam turbine;
s15: the GV1 is slowly opened to be consistent with the opening degree of other high-pressure valves;
s16: obtaining a change curve of the relative opening degree and the relative flow of the high-pressure regulating valve GV1 of the steam turbine through a steam turbine flow characteristic test;
s17: in the same way, the change curves of the relative opening degree and the relative flow of the high-pressure valves GV2, GV3 and GV4 are obtained.
Before the steam turbine is optimized, the opening of the high-pressure regulating valve greatly fluctuates when the steam turbine is subjected to primary frequency modulation, after the method disclosed by the invention is used, the opening and closing amplitude of the high-pressure regulating valve is obviously reduced, as shown in fig. 3, the fluctuation amplitude of the opening of the high-pressure regulating valve is reduced, the vibration of an EH oil pipeline is greatly reduced, and the vibration phenomenon of the EH oil pipeline is basically eliminated.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. In addition, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation, the use of the term being generic or similar to other means being encompassed by the invention.
Claims (4)
1. A method for solving the problem of EH oil pipeline vibration caused by primary frequency modulation of a steam turbine is characterized by comprising the following steps:
s1: respectively manufacturing change curves of the relative flow and the relative opening of high-pressure regulating gates GV1, GV2, GV3 and GV4 of the steam turbine;
s2: determining a saturation area of a change curve of the relative flow and the relative opening of each high-pressure regulating valve;
s3: setting the opening time of the next high-pressure regulating valve to enable the next high-pressure regulating valve to be opened slightly before the previous high-pressure regulating valve enters a saturation area;
s4: and the valve opening rising rate of the saturation area is reduced, and the action amplitude of the oil engine is reduced.
2. The method for solving the problem of vibration of the EH oil pipeline caused by the primary frequency modulation of the steam turbine as claimed in claim 1, wherein: the specific process of step S1 is as follows:
s11: keeping the load of the steam turbine stable at about 90%;
s12: switching a control mode of a high-pressure regulating valve of the steam turbine to full-circle steam admission, and switching the high-pressure regulating valve of the steam turbine to manual operation after the opening degrees of 4 high-pressure regulating valves are consistent;
s13: the GV1 throttle valve is slowly closed, and the fuel quantity of the boiler is adjusted in the closing process, so that the main steam pressure of the steam turbine is ensured to be stable;
s14: recording the corresponding relation between the steam flow of the unit and the valve position of a high-pressure regulating valve GV1 of the steam turbine;
s15: the GV1 is slowly opened to be consistent with the opening degree of other high-pressure valves;
s16: obtaining a change curve of the relative opening degree and the relative flow of the high-pressure regulating valve GV1 of the steam turbine through a steam turbine flow characteristic test;
s17: in the same way, the change curves of the relative opening degree and the relative flow of the high-pressure valves GV2, GV3 and GV4 are obtained.
3. The method for solving the problem of vibration of the EH oil pipeline caused by the primary frequency modulation of the steam turbine as claimed in claim 1, wherein: in step S2, when the opening of the high-pressure throttle is increased and the steam inlet flow rate is not significantly increased, the steam enters the saturation region.
4. The method for solving the problem of vibration of the EH oil pipeline caused by the primary frequency modulation of the steam turbine as claimed in claim 1, wherein: in step S3, the opening timing of the next high-pressure valve in the sequence valve mode is set according to the opening degree of the saturation point of each high-pressure valve.
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