CN113565580A - Load control system for steam turbine of split-shaft combined cycle unit - Google Patents
Load control system for steam turbine of split-shaft combined cycle unit Download PDFInfo
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- CN113565580A CN113565580A CN202110771863.9A CN202110771863A CN113565580A CN 113565580 A CN113565580 A CN 113565580A CN 202110771863 A CN202110771863 A CN 202110771863A CN 113565580 A CN113565580 A CN 113565580A
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- 230000009467 reduction Effects 0.000 claims description 13
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 230000005764 inhibitory process Effects 0.000 claims description 2
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/105—Final actuators by passing part of the fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- 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
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/14—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for responsive to other specific conditions
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Abstract
The invention discloses a steam turbine load control system of a split-shaft combined cycle unit, which comprises a steam turbine load instruction module, a load control module and a load control module, wherein the steam turbine load instruction module is provided with a load instruction value and a load target value and is used for judging difference information between the load instruction value and the load target value; the speed module is used for controlling the load lifting speed of the load instruction value; the valve action module is used for controlling the opening of the main regulating valve; the steam turbine actual load module acquires and transmits a steam turbine actual load value in real time, and the steam turbine actual load module and the steam turbine load instruction module perform information interaction to control the valve action module; the differential expansion protection module is used for inhibiting when the differential expansion of the steam turbine exceeds a normal value, solving the problem that the opening speed of the valve is different due to the technical level difference of operators by arranging a steam turbine load control system, realizing the stability of the opening speed of the steam turbine valve, ensuring the stability of the temperature rise speed of the steam turbine, effectively improving the automation degree and improving the safety performance.
Description
Technical Field
The invention belongs to the technical field of steam turbine load control, and particularly relates to a steam turbine load control system of a split-shaft combined cycle unit.
Background
In recent years, the proportion of F-grade gas and steam combined cycle units put into production in China is getting larger, the units basically run in a peak shaving mode, the control mode of the combined cycle units needs to adapt to the running needs of two shifts, a steam turbine in the combined cycle units is divided into three different starting states of a cold state, a warm state and a hot state according to different cylinder temperatures, the starting states of the steam turbine are different according to the requirements of manufacturers, and steam parameters required by rush transfer are also different.
After the steam turbine is converted into a grid, the control mode of the load increase of the steam turbine can be divided into valve control, pressure control and power control. The load-up control of the steam turbines of most of the produced split-shaft combined cycle units is in a valve control mode.
However, in the prior art, the valve opening rate is determined by an operator according to operation experience, the increase of the steam inlet volume of the steam turbine is nonlinear due to the valve characteristics, the opening rate of the valve of the steam turbine is different due to the difference of the technical levels of the operator, the temperature rise rate of the cylinder of the steam turbine is also different, especially for cold states and warm states, the risk of large expansion difference of the steam turbine due to the fact that the valve opening rate is too fast exists, the automation degree is low, manpower is increased, and the safety performance is poor.
Disclosure of Invention
The embodiment of the application provides a split-shaft combined cycle unit steam turbine load control system, through setting up steam turbine load control system, the lift load rate of control rate module and the main regulating valve aperture size of valve action module, it is different to have solved because of the operating personnel technical level difference leads to the valve speed of opening, the different problem of steam turbine jar temperature rate of rise, it is steady to have realized the guarantee steam turbine valve speed of opening, steam turbine temperature rise rate is steady, effectively improve degree of automation, guarantee the automatic matching of split-shaft combined cycle unit load of rise and load rate of fall, guarantee to open and stop in-process automatic load control and automatic load reduction control, effectively promote the flexibility that the steam turbine opened and stopped control, guarantee the big shutting protection of the expanding difference of steam turbine lift load in-process, improve the security performance.
The technical scheme provided by the embodiment of the application is as follows:
the utility model provides a split shaft combined cycle unit steam turbine load control system, including:
the steam turbine load instruction module comprises a load instruction value and a load target value and is used for judging the difference information between the load instruction value and the load target value;
the speed module is used for controlling the lifting load speed of the load instruction value according to the state of the steam turbine and the difference information;
the valve action module is used for controlling the opening of the main regulating valve;
the steam turbine actual load module acquires and transmits a steam turbine actual load value in real time, and the steam turbine actual load module and the steam turbine load instruction module perform information interaction to control the valve action module;
and the differential expansion protection module is used for realizing the inhibition of the differential expansion of the steam turbine when exceeding a normal value.
According to the method, a load target value is given through a steam turbine load instruction module, the load instruction value determines the speed through a speed module according to the state and difference information of a steam turbine so as to reach the load target value, meanwhile, information interaction is carried out according to the load instruction value of the steam turbine load instruction module and the actual load value of the actual load module of the steam turbine, and then the opening size of a main regulating valve of a valve action module is controlled, wherein the information interaction is that the actual load value is compared with the load instruction value, the actual load value is consistent with the load instruction value by controlling the opening size of the main regulating valve, the steam flow entering the steam turbine is controlled by controlling the opening size of the main regulating valve, so that the automatic load increasing control and the automatic load decreasing control in the starting and stopping process are realized, and the flexibility of the starting and stopping control of the steam turbine is effectively improved; the automatic matching of the load increasing rate and the load decreasing rate of the steam turbine of the split coupling circulating unit is ensured through the rate module; by controlling the differential expansion protection module, the load change of the steam turbine can be locked when the differential expansion exceeds a set value, namely the lifting load rate of the rate module is 0, the differential expansion in the lifting load process of the steam turbine is ensured to be large, and the safety performance is improved.
Further, the difference information includes first difference information and second difference information, the first difference information indicates that the load target value is higher than the load command value, and the second difference information indicates that the load target value is lower than the load command value.
Further, when the difference information is first difference information, the rate module controls the load-increasing rate of the load instruction value, and the valve action module controls the main regulating valve to be in an open state until the actual load value is consistent with the load instruction value; and when the difference information is the second difference information, the rate module controls the load reduction rate of the load instruction value, and the valve action module controls the main regulating valve to be in a closed state until the actual load value is consistent with the load instruction value.
Further, when the steam turbine is in a cold starting state, the rate module controls the load-rise rate of the load instruction value to be 0.8 MW/min; when the steam turbine is in a temperature starting state, the rate module controls the load increasing rate of the load instruction value to be 1.2 MW/min; and when the steam turbine is in a hot starting state, the rate module controls the load increasing rate of the load instruction value to be 5.0 MW/min.
Further, when the difference information is first difference information, the opening state includes a first stage load state, a second stage load state, and a third stage load state that are sequentially performed, the third stage load state is a main regulating valve fully-opened state, and when the first stage load state operates for a certain time, the first stage load state is regulated to enter the second stage load state, and then the second stage load state enters the third stage load state.
Further, the first-stage load state is a warming load state, and the warming load value is 15.2 MW.
Further, the second stage load state is a set load state, and the set load value is 150 MW.
Further, the first-stage load state operation time is determined according to the starting state of the steam turbine, and when the starting state of the steam turbine is a cold starting state, the first-stage load state operation time is 30 minutes; when the starting state of the steam turbine is a temperature state starting state, the running time of the first-stage load state is 20 minutes; and when the starting state of the steam turbine is a hot starting state, the running time of the first-stage load state is 10 minutes.
According to the steam turbine load-lifting control process, when the difference information is the first difference information, the load-lifting rate of the load instruction value is controlled through the rate module, the main regulating valve is controlled to be in the opening state through the valve action module until the actual load value is consistent with the load instruction value, the load lifting is sequentially carried out through three stages in the load-lifting process, automatic load-lifting control in the starting and stopping process is achieved, and flexibility of starting and stopping control of the steam turbine is effectively improved.
Further, when the difference information is the second difference information, the rate module controls the load reduction rate of the load instruction value to be 5.0MW/min until the load instruction value is less than 10 MW.
According to the steam turbine load reduction control process, when the difference information is the second difference information, the load reduction rate of the load instruction value is controlled through the rate module, the main regulating valve is controlled to be in a closed state through the valve action module until the actual load value is consistent with the load instruction value, automatic load reduction control in the starting and stopping process is achieved, and flexibility of starting and stopping control of the steam turbine is effectively improved.
The control system automatically controls the load-up and load-down operations of the steam turbine, an operator can quit the control system program at any time according to the operation condition of the equipment, the current state of the steam turbine is kept unchanged, and the steam turbine is switched to be operated manually.
Further, the differential expansion protection module is used for locking the speed module when the differential expansion exceeds a set value.
Through the protection setting of the differential expansion protection module, the set value can be set according to specific actual conditions, the set value can be preferably set to be 8.5mm, when the lifting load rate of the rate module exceeds the set value, the rate module is locked through the differential expansion protection module, namely the load change rate is 0, the load change of the steam turbine is locked, and therefore the safe operation of the steam turbine can be effectively guaranteed.
The invention has the beneficial effects that:
through setting up steam turbine load control system, the lift load rate of control rate module and the main control valve aperture size of valve action module, it is different to have solved because of the operating personnel technical level difference leads to the valve speed of opening, the different problem of steam turbine jar temperature rate of rise, it is steady to have realized guaranteeing steam turbine valve speed of opening, steam turbine temperature rise speed is steady, effectively improve degree of automation, guarantee the automatic matching of branch shaft coupling circulation unit load-up and load rate of falling, guarantee open and stop automatic load control and automatic load control of rising among the in-process, effectively promote the flexibility that the steam turbine opened and stopped control, realize the big shutting protection of the difference of expansion among the steam turbine lift load-up process, and the safety performance is improved.
Drawings
FIG. 1 is a schematic diagram of the turbine load ramp-up control of the present invention;
FIG. 2 is a schematic diagram of the turbine load shedding control of the present invention.
The labels in the figure are: a steam turbine load instruction module 1; a rate module 2; a valve actuation module 3; a turbine actual load module 4; and an expansion difference protection module 5.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
To facilitate an understanding of the present invention for those skilled in the art, the present invention will be described in further detail below with reference to specific embodiments and accompanying drawings.
As shown in fig. 1-2, a load control system for a steam turbine of a split-shaft combined cycle unit according to an embodiment of the present invention includes:
the steam turbine load instruction module 1 comprises a load instruction value and a load target value, and is used for judging difference information between the load instruction value and the load target value;
the speed module 2 is used for controlling the lifting load speed of the load instruction value according to the state of the steam turbine and the difference information;
the valve action module 3 is used for controlling the opening of the main regulating valve;
the steam turbine actual load module 4 is used for acquiring and transmitting a steam turbine actual load value in real time, and the steam turbine actual load module and the steam turbine load instruction module perform information interaction to control the valve action module;
and the differential expansion protection module 5 is used for realizing the suppression of the differential expansion of the steam turbine when exceeding a normal value.
In the invention, a load target value is given through a steam turbine load instruction module 1, the load instruction value determines the speed through a speed module 2 according to the state and difference information of the steam turbine so as to reach the load target value, meanwhile, information interaction is carried out according to the load instruction value of the steam turbine load instruction module 1 and the actual load value of the steam turbine actual load module, so as to control the opening degree of the main regulating valve of the valve action module 3, wherein, the information interaction is to compare the actual load value with the load instruction value, the actual load value is consistent with the load instruction value by controlling the opening of the main regulating valve, the flow of steam entering the steam turbine is controlled by controlling the opening of the main regulating valve, so that the automatic load-up control and the automatic load-down control in the starting and stopping process are realized, the flexibility of the starting and stopping control of the steam turbine is effectively improved, the automatic matching of the load increasing rate and the load decreasing rate of the steam turbine of the split coupling circulating unit is ensured through the rate module; by controlling the differential expansion protection module 5, when the differential expansion exceeds a set value, the load change of the steam turbine can be locked, namely the lifting load rate of the rate module 2 is 0, the differential expansion in the process of lifting the load of the steam turbine is ensured to be large for locking protection, and the safety performance is improved.
Further, the difference information includes first difference information and second difference information, the first difference information indicates that the load target value is higher than the load command value, and the second difference information indicates that the load target value is lower than the load command value.
Further, when the difference information is first difference information, the rate module 2 controls the load-increasing rate of the load instruction value, and the valve action module 3 controls the main regulating valve to be in an open state until the actual load value is consistent with the load instruction value; when the difference information is the second difference information, the rate module 2 controls the load reduction rate of the load instruction value, and the valve action module 3 controls the main regulating valve to be in a closed state until the actual load value is consistent with the load instruction value.
Further, when the steam turbine is in a cold starting state, the rate module 2 controls the load-rise rate of the load instruction value to be 0.8 MW/min; when the steam turbine is in a temperature starting state, the rate module 2 controls the load increasing rate of the load instruction value to be 1.2 MW/min; and when the steam turbine is in a hot starting state, the rate module 2 controls the load-lifting rate of the load instruction value to be 5.0 MW/min.
Further, when the difference information is first difference information, the opening state includes a first stage load state, a second stage load state, and a third stage load state that are sequentially performed, the third stage load state is a main regulating valve fully-opened state, and when the first stage load state operates for a certain time, the first stage load state is regulated to enter the second stage load state, and then the second stage load state enters the third stage load state.
Further, the first-stage load state is a warming load state, and the warming load value is 15.2 MW.
Further, the second stage load state is a set load state, and the set load value is 150 MW.
Further, the first-stage load state operation time is determined according to the starting state of the steam turbine, and when the starting state of the steam turbine is a cold starting state, the first-stage load state operation time is 30 minutes; when the starting state of the steam turbine is a temperature state starting state, the running time of the first-stage load state is 20 minutes; and when the starting state of the steam turbine is a hot starting state, the running time of the first-stage load state is 10 minutes.
In the process of controlling the load increase of the steam turbine, when the difference information is the first difference information, the load increase rate of the load instruction value is controlled through the rate module 2, the main regulating valve is controlled to be in an opening state through the valve action module 3 until the actual load value is consistent with the load instruction value, the load increase is sequentially carried out through three stages in the load increase process, the automatic load increase control in the starting and stopping process is realized, and the flexibility of the starting and stopping control of the steam turbine is effectively improved.
Further, when the difference information is the second difference information, the rate module 2 controls the load reduction rate of the load instruction value to be 5.0MW/min until the load instruction value is less than 10 MW.
In the process of controlling the load reduction of the steam turbine, when the difference information is the second difference information, the load reduction rate of the load instruction value is controlled through the rate module 2, the main regulating valve is controlled to be in a closed state through the valve action module until the actual load value is consistent with the load instruction value, automatic load reduction control in the process of starting and stopping is achieved, and flexibility of starting and stopping control of the steam turbine is effectively improved.
The control system automatically controls the load-up and load-down operations of the steam turbine, an operator can quit the control system program at any time according to the operation condition of the equipment, the current state of the steam turbine is kept unchanged, and the steam turbine is switched to be operated manually.
Further, the differential expansion protection module 5 is used for locking the speed module when the differential expansion exceeds a set value.
Through the protection setting of the differential expansion protection module, the set value can be set according to specific actual conditions, the set value can be preferably set to be 8.5mm, when the lifting load rate of the rate module exceeds the set value, the rate module is locked through the differential expansion protection module, namely the load change rate is 0, the load change of the steam turbine is locked, and therefore the safe operation of the steam turbine can be effectively guaranteed.
The invention has the beneficial effects that:
through setting up steam turbine load control system, the lift load rate of control rate module and the main control valve aperture size of valve action module, it is different to have solved because of the operating personnel technical level difference leads to the valve speed of opening, the different problem of steam turbine jar temperature rate of rise, it is steady to have realized guaranteeing steam turbine valve speed of opening, steam turbine temperature rise speed is steady, effectively improve degree of automation, through the rate module, guarantee the automatic matching of branch shaft circulation unit steam turbine load-up and load-down speed, guarantee to open and stop in-process automatic load-up control and automatic load-down control, effectively promote the flexibility that the steam turbine opened and stopped control, realize the big shutting protection of the difference of expansion in the steam turbine load-up and-down process, and the safety performance is improved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art. It should be noted that the technical features not described in detail in the present invention can be implemented by any prior art.
Claims (10)
1. The utility model provides a split shaft combined cycle unit steam turbine load control system which characterized in that, including:
the steam turbine load instruction module comprises a load instruction value and a load target value and is used for judging the difference information between the load instruction value and the load target value;
the speed module is used for controlling the lifting load speed of the load instruction value according to the state of the steam turbine and the difference information;
the valve action module is used for controlling the opening of the main regulating valve;
the steam turbine actual load module acquires and transmits a steam turbine actual load value in real time, and the steam turbine actual load module and the steam turbine load instruction module perform information interaction to control the valve action module;
and the differential expansion protection module is used for realizing the inhibition of the differential expansion of the steam turbine when exceeding a normal value.
2. The split combined cycle steam turbine load control system according to claim 1, wherein the difference information includes first difference information and second difference information, the first difference information indicates that the load target value is higher than the load command value, and the second difference information indicates that the load target value is lower than the load command value.
3. The steam turbine load control system of the split-shaft combined cycle unit according to claim 2, wherein when the difference information is first difference information, the rate module controls the load-lifting rate of the load instruction value, and the valve action module controls the main regulating valve to be in an open state until the actual load value is consistent with the load instruction value; and when the difference information is the second difference information, the rate module controls the load reduction rate of the load instruction value, and the valve action module controls the main regulating valve to be in a closed state until the actual load value is consistent with the load instruction value.
4. The steam turbine load control system of the split coupling cycle unit according to claim 3, wherein when the steam turbine state is a cold start state, the rate module controls the load-up rate of the load instruction value to be 0.8 MW/min; when the steam turbine is in a temperature starting state, the rate module controls the load increasing rate of the load instruction value to be 1.2 MW/min; and when the steam turbine is in a hot starting state, the rate module controls the load increasing rate of the load instruction value to be 5.0 MW/min.
5. The steam turbine load control system of the split-shaft combined cycle unit according to claim 4, wherein when the difference information is first difference information, the opening state includes a first stage load state, a second stage load state and a third stage load state which are sequentially performed, the third stage load state is a main control valve fully-opened state, and when the first stage load state operates for a certain time, the first stage load state is adjusted to enter the second stage load state, and then the second stage load state enters the third stage load state.
6. The split coupled cycle unit steam turbine load control system of claim 5, wherein the first stage load condition is a warm-up load condition having a warm-up load value of 15.2 MW.
7. The split coupled cycle unit steam turbine load control system of claim 5, wherein the second stage load condition is a set load condition having a set load value of 150 MW.
8. The steam turbine load control system of the split combined cycle unit according to claim 5, wherein the first stage load state operation time is determined according to a steam turbine starting state, and when the steam turbine starting state is a cold starting state, the first stage load state operation time is 30 minutes; when the starting state of the steam turbine is a temperature state starting state, the running time of the first-stage load state is 20 minutes; and when the starting state of the steam turbine is a hot starting state, the running time of the first-stage load state is 10 minutes.
9. The split coupled cycle unit steam turbine load control system according to claim 3, wherein when the difference information is the second difference information, the rate module controls the load reduction rate of the load command value to be 5.0MW/min until the load command value is less than 10 MW.
10. The split coupled cycle unit steam turbine load control system of claim 1, wherein the swell protection module is configured to latch the rate module when the swell exceeds a set value.
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| CN202110771863.9A CN113565580A (en) | 2021-07-08 | 2021-07-08 | Load control system for steam turbine of split-shaft combined cycle unit |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101769180A (en) * | 2009-01-05 | 2010-07-07 | 华北电力科学研究院有限责任公司 | Control method and system thereof for biaxial gas-steam combined cycle unit |
| WO2016011751A1 (en) * | 2014-07-25 | 2016-01-28 | 国网上海市电力公司 | Speed adjustment method based on combined circulation gas turbine system model |
| US20170068886A1 (en) * | 2015-09-09 | 2017-03-09 | Emerson Process Management Power & Water Solutions, Inc. | Model-based characterization of pressure/load relationship for power plant load control |
| CN107784168A (en) * | 2017-10-11 | 2018-03-09 | 上海交通大学 | The full working scope analogue system of nuclear power station half speed turbine system |
| CN112833380A (en) * | 2021-01-08 | 2021-05-25 | 光大环保能源（江阴）有限公司 | High-low pressure bypass control system of intermediate reheating unit for power generation industry |
-
2021
- 2021-07-08 CN CN202110771863.9A patent/CN113565580A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101769180A (en) * | 2009-01-05 | 2010-07-07 | 华北电力科学研究院有限责任公司 | Control method and system thereof for biaxial gas-steam combined cycle unit |
| WO2016011751A1 (en) * | 2014-07-25 | 2016-01-28 | 国网上海市电力公司 | Speed adjustment method based on combined circulation gas turbine system model |
| US20170068886A1 (en) * | 2015-09-09 | 2017-03-09 | Emerson Process Management Power & Water Solutions, Inc. | Model-based characterization of pressure/load relationship for power plant load control |
| CN107784168A (en) * | 2017-10-11 | 2018-03-09 | 上海交通大学 | The full working scope analogue system of nuclear power station half speed turbine system |
| CN112833380A (en) * | 2021-01-08 | 2021-05-25 | 光大环保能源（江阴）有限公司 | High-low pressure bypass control system of intermediate reheating unit for power generation industry |
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Application publication date: 20211029 |
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