CN105652663A - Method for sliding pressure curve deep optimization based on load zone distinguishing - Google Patents
Method for sliding pressure curve deep optimization based on load zone distinguishing Download PDFInfo
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- G—PHYSICS
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
- G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
- G05B13/04—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators
- G05B13/042—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators in which a parameter or coefficient is automatically adjusted to optimise the performance
Abstract
The invention discloses a method for sliding pressure curve deep optimization based on load zone distinguishing. A sliding pressure curve of a turbine under a certain back pressure is obtained through a control valve steam distribution optimization test, and then the running relation between the main steam pressure and the unit power under the certain back pressure is obtained. The method for deep optimization comprises the steps that when the back pressure of the unit changes, the unit power obtained after the back pressure changes is corrected to the power corresponding to the back pressure of the unit when the known sliding pressure curve changes through back pressure correction, and therefore the optimal main steam pressure under the changing back pressure condition is obtained. The corrected power corresponding to the back pressure of the unit when the known sliding pressure curve changes is used as the standard, the main steam pressure is adjusted corresponding to the known sliding pressure curve, in this way, the optimal sliding pressure curve can be obtained no matter how the back pressure of the unit changes, the economy of the unit is greatly improved, and the method is simple and easy to implement.
Description
Technical field
A kind of method that the present invention relates to sliding pressure curve depth optimization differentiated based on loading zone.
Background technology
Along with deepening constantly of China's reform and opening-up, China's economic development achieves remarkable effect, and particularly thermal power plant has played significant role in meeting Electricity Demand, but energy resource consumption and problem of environmental pollution remain without and be well solved. Current energy-saving and emission-reduction are the fundamental state policies of China, and power plant is also that pressure is huge in energy-saving and emission-reduction.
The main steam pressure control system of prior art, is obtain, according to sliding pressure curve, the pressure set points that current loads is corresponding, introduces in boiler master controller and carry out closed loop adjustment. Increasing however as installed capacity, the rate of load condensate of current each power plant is only about 70%, and some big units are also required to participate in peak regulation, and energy-conservation situation is more acute; Therefore, efficient, energy-conservation, a stable sliding pressure curve is exactly the problem that solution is needed in power plant badly. Sliding pressure curve in peak load regulation situation is all optimized by a lot of power plant at present, but optimization of sliding pressure test is to carry out when certain turbine back pressure, when external environment changes, such as winter, Xia Liangji, back pressure of condenser difference is up to more than 5kPa, under same load, main steam flow difference is obvious, optimum main vapour pressure is also just different, therefore, how regulating maintenance main steam pressure parameter stability, thus making all other parameters of unit stable therewith, raising unit operation stability and economy being had important meaning.
Summary of the invention
A kind of method that the purpose of the present invention is to propose to sliding pressure curve depth optimization differentiated based on loading zone, it is solve the problem that the optimization of sliding pressure curve of thermal power plant does not adapt to economy, on steam turbine optimization of sliding pressure curve basis, when invention one is for space-variant surely, steam turbine sliding pressure curve adjusts mode.
To achieve these goals, a kind of method that the technical scheme is that sliding pressure curve depth optimization differentiated based on loading zone, steam turbine joins, by pitch, the sliding pressure curve that vapour optimization Test obtains under a back pressure, and then obtains under this back pressure the operational relation between the power of the assembling unit and main steam pressure; Wherein, the method of described depth optimization is, when described unit back pressuce changes, by back pressure correction, the power of the assembling unit after economy is adapted to the power that described sliding pressure curve unit back pressuce is corresponding, thus obtaining the main steam pressure of depth optimization under change backpressure condition.
Scheme is further: described the power of the assembling unit after economy is adapted to known sliding pressure curve unit back pressuce corresponding by back pressure correction power process be:
The first step: join vapour optimization Test by pitch and obtain the sliding pressure curve under test back pressure;
Second step: obtain the fair curve of unit back pressuce and the power of the assembling unit;
3rd step: the fair curve according to back pressure Yu the power of the assembling unit, is adapted to the power corresponding with described sliding pressure curve unit back pressuce by the power of the assembling unit after economy;
Wherein: known sliding pressure curve is that steam turbine joins the sliding pressure curve under the back pressure that vapour optimization Test obtains by pitch.
Scheme is further: the fair curve of described unit back pressuce and the power of the assembling unit is to be provided by steam turbine producer.
Scheme is further: the described correction power of the assembling unit is by formula Pe "=Pe'/[1+ (y1-y2)] obtain, wherein: Pe' is the power of the assembling unit after economy, Pe " it is adapted to power of the assembling unit during known sliding pressure curve correspondence back pressure, y for the power of the assembling unit after economy1For the correction factor that back pressure after change is corresponding, y2For the correction factor under known sliding pressure curve correspondence back pressure, wherein, described correction factor y1With described correction factor y2It is obtain from fair curve.
The power that when present invention is to be adapted to known sliding pressure curve, unit back pressuce is corresponding is for benchmark, main vapour pressure is adjusted by corresponding known sliding pressure curve: so how no matter unit back pressuce change, can there is an optimized sliding pressure curve, substantially increasing the economy of unit, described method is simple.
Below in conjunction with drawings and Examples, invention is described in detail.
Accompanying drawing explanation
Fig. 1 is the implementing procedure figure of the inventive method;
The power of Fig. 2 optimum and pressure curve;
The fair curve of Fig. 3 back pressure and power.
Detailed description of the invention
A kind of method of sliding pressure curve depth optimization differentiated based on loading zone, as the Steam Turbine of steam-electric power, pitch joins the sliding pressure curve that vapour optimization Test obtains under a back pressure, and then obtains under this back pressure the operational relation between the power of the assembling unit and main steam pressure, , then main steam pressure is regulated and controled according to this relation, but as stated in the Background Art: the optimization of sliding pressure test obtaining sliding pressure curve is to carry out when certain turbine back pressure, when external environment changes, the such as winter, season in summer two, back pressure of condenser difference is up to more than 5kPa, under same load, main steam flow difference is obvious, optimum main vapour pressure is also just different, this sliding pressure curve is not just optimum sliding pressure curve, in order to maintain main steam pressure parameter stability, thus making all other parameters of unit stable therewith, need to carry out the optimization of the degree of depth, and then raising unit operation stability and economy are had important meaning. therefore, the method of depth optimization described in the present embodiment is, when described unit back pressuce changes, by back pressure correction, the power of the assembling unit after machine economy is adapted to the power that described sliding pressure curve unit back pressuce is corresponding, thus obtaining the main steam pressure of depth optimization under change backpressure condition.
In embodiment: described the power of the assembling unit after economy is adapted to known sliding pressure curve unit back pressuce corresponding by back pressure correction power process be:
The first step: join vapour by pitch and obtain the sliding pressure curve under test back pressure; That is: join vapour optimization experiment method by traditional pitch and obtain the sliding pressure curve under test back pressure. As shown in Figure 2, it is simply that the sliding pressure curve obtained after vapour optimization is joined by pitch by certain power plant, it is a known sliding pressure curve. Relation between power of the assembling unit Pe and main steam pressure is: work as Pe0<Pe<Pe1Time, unit sliding pressure operation; Work as Pe1<Pe<Pe2Time, unit fixed pressure operation; Work as Pe2<Pe<Pe3Time, unit sliding pressure operation;Work as Pe3<Pe<Pe4Time, unit fixed pressure operation. According to described sliding pressure curve, the power of each correspondence has a corresponding main steam pressure, adjusts main steam pressure according to this sliding pressure curve, it is possible to be greatly improved the economy of unit. But this sliding pressure curve is only limited to a certain fixing back pressure pc.
Second step: obtain the fair curve of unit back pressuce and the power of the assembling unit; The fair curve of back pressure and power is all provided by steam turbine producer, as it is shown on figure 3, this figure is exactly the fair curve of typical back pressure and power.
3rd step: the fair curve according to back pressure Yu the power of the assembling unit, is adapted to the power corresponding with described sliding pressure curve unit back pressuce by the power of the assembling unit after economy.
According to Fig. 3, the described correction power of the assembling unit can pass through formula Pe "=Pe'/[1+ (y1-y2)] obtain, wherein: Pe' is the power of the assembling unit after economy, Pe " it is adapted to power of the assembling unit during known sliding pressure curve correspondence back pressure, y for the power of the assembling unit after economy1For the correction factor that back pressure after change is corresponding, y2For the correction factor under known sliding pressure curve correspondence back pressure, wherein, described correction factor y1With described correction factor y2It is obtain from fair curve.
The power that during to be adapted to known sliding pressure curve, unit back pressuce is corresponding is for benchmark, main vapour pressure is adjusted by corresponding known sliding pressure curve: namely with revised power of the assembling unit Pe " for benchmark, power interval corresponding on known optimum sliding pressure curve carries out pressure adjustment: work as Pe0<Pe��<Pe1Time, corresponding Pe0-Pe1Section curve enters
Row sliding pressure operation; Work as Pe1<Pe��<Pe2Time, corresponding Pe1-Pe2Section curve carries out fixed pressure operation; When
Pe2<Pe��<Pe3Time, corresponding Pe2-Pe3Section curve carries out sliding pressure operation;
Work as Pe3< Pe " time, corresponding Pe3-Pe4Section curve carries out fixed pressure operation.
In embodiment: it is in 50%��100% load range that described pitch joins vapour optimization method, 8��10 load point of average selection, in each load point, arrange 4��5 different high pitch open position including former valve sequence, carry out thermal loss of steam turbine rate test, final according to each operating condition of test heat consumption rate result of the test, select the pitch valve position that heat consumption rate is minimum, as joining vapour optimal valve position after new optimization. Obtain the sliding pressure curve under test back pressure on this basis.
Fig. 1 is the implementing procedure figure of this method:
1. join, by traditional pitch, the sliding pressure curve that vapour optimization method obtains under a certain back pressure. As shown in Figure 2. This sliding pressure curve is only limited to a certain fixing back pressure pc.
2. obtain the fair curve of unit back pressuce and power. The fair curve of back pressure and power is all provided by steam turbine producer; As shown in Figure 3.
3. by the back pressure fair curve to power, by power corresponding for the power correction after economy to the unit back pressuce of existing sliding pressure curve.
4. the power that time to be adapted to known sliding pressure curve, unit back pressuce is corresponding is for benchmark, main vapour pressure is adjusted by corresponding known sliding pressure curve: namely with revised power of the assembling unit Pe " for benchmark, power interval corresponding on known optimum sliding pressure curve carries out pressure adjustment.
How no matter such unit back pressuce change, and can have an optimized sliding pressure curve, substantially increase the economy of unit.
Claims (4)
1. the method for sliding pressure curve depth optimization differentiated based on loading zone, steam turbine joins, by pitch, the sliding pressure curve that vapour optimization Test obtains under a back pressure, and then obtains under this back pressure the operational relation between the power of the assembling unit and main steam pressure;It is characterized in that, the method of described depth optimization is, when described unit back pressuce changes, by back pressure correction, the power of the assembling unit after economy is adapted to the power that described sliding pressure curve unit back pressuce is corresponding, thus obtaining the main steam pressure of depth optimization under change backpressure condition.
2. the method for depth optimization according to claim 1, it is characterised in that described the power of the assembling unit after economy is adapted to known sliding pressure curve unit back pressuce corresponding by back pressure correction power process be:
The first step: join vapour optimization Test by pitch and obtain the sliding pressure curve under test back pressure;
Second step: obtain the fair curve of unit back pressuce and the power of the assembling unit;
3rd step: the fair curve according to back pressure Yu the power of the assembling unit, is adapted to the power corresponding with described sliding pressure curve unit back pressuce by the power of the assembling unit after economy;
Wherein: known sliding pressure curve is that steam turbine joins the sliding pressure curve under the back pressure that vapour optimization Test obtains by pitch.
3. the method for depth optimization according to claim 2, it is characterised in that the fair curve of described unit back pressuce and the power of the assembling unit is to be provided by steam turbine producer.
4. the method for depth optimization according to claim 2, it is characterised in that the described correction power of the assembling unit is by formula Pe "=Pe'/[1+ (y1-y2)] obtain, wherein: Pe' is the power of the assembling unit after economy, Pe " it is adapted to power of the assembling unit during known sliding pressure curve correspondence back pressure, y for the power of the assembling unit after economy1For the correction factor that back pressure after change is corresponding, y2For the correction factor under known sliding pressure curve correspondence back pressure, wherein, described correction factor y1With described correction factor y2It is obtain from fair curve.
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| CN106401660A (en) * | 2016-11-25 | 2017-02-15 | 国网河南省电力公司电力科学研究院 | Steam turbine sliding pressure optimization control method based on multi-dimension curved surface |
| CN107218086A (en) * | 2017-07-28 | 2017-09-29 | 华能平凉发电有限责任公司 | Steam turbine and its sliding pressure curve correcting method and system based on load capacity |
| CN107587902A (en) * | 2017-09-21 | 2018-01-16 | 国网江西省电力公司电力科学研究院 | A kind of real-time back pressure modification method of Steam Turbine variable-pressure operation |
| CN107654264A (en) * | 2017-09-20 | 2018-02-02 | 徐州华润电力有限公司 | Sliding pressure curve acquisition method, system and pressure regulating method and system |
| CN110262281A (en) * | 2019-05-07 | 2019-09-20 | 东南大学 | Unit sliding pressure operation control method and system |
| CN111045321A (en) * | 2019-06-26 | 2020-04-21 | 控软自动化技术（北京）有限公司 | Method for coordinately controlling embedded internal model controller under deep peak regulation |
| CN112685969A (en) * | 2020-12-24 | 2021-04-20 | 润电能源科学技术有限公司 | Optimization method for cold end of large-scale thermal power plant |
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| CN110262281A (en) * | 2019-05-07 | 2019-09-20 | 东南大学 | Unit sliding pressure operation control method and system |
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| CN112685969A (en) * | 2020-12-24 | 2021-04-20 | 润电能源科学技术有限公司 | Optimization method for cold end of large-scale thermal power plant |
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