CN103850726B - Method for quickly determining stationary sliding pressing optimization curve of steam turbine - Google Patents
Method for quickly determining stationary sliding pressing optimization curve of steam turbine Download PDFInfo
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Abstract
The invention discloses a method for quickly determining a stationary sliding pressing optimization curve of a steam turbine. The method is applicable to a large steam turbine generator unit with the nozzle steam spraying mode. The method is characterized in that a data collecting system collects operation data and then the efficiency variation curve of a high pressure cylinder in the whole sliding pressing process is calculated, and thus the optimal valve position of a high-pressure regulating valve of the steam turbine and the sliding pressing optimization curve of the steam turbine within a full-load operation section can be determined. The method is simple, practical and accurate. With the adoption of the method, the time spent on obtaining the stationary sliding pressing optimization curve can be greatly saved, the curve precision can be improved, the operation energy consumption of a power plant can be decreased, and the test cost can be saved; the method can be widely applied to the real-time operation optimization system of the steam turbine of a thermal power plant.
Description
Technical field
The invention belongs to power field, relate to a kind of method that optimization of sliding pressure curve determined by steam turbine of determining fast.
Background technique
Along with the increase gradually of electrical network peak-valley difference, large-scale (surpassing), critical Turbo-generator Set participated in peaking operation, sliding pressure (transformation) method of operation improves sub load tubine heat consumption rate, and the thermal stress of steam turbine when reducing load change, as the good energy-saving method of one by most of power plant is adopted.By analyzing multiple stage unit optimization of sliding pressure running test achievement in research in recent years, find that high-pressure cylinder efficiency is the basic reason affecting best sliding pressure point with the change curve characteristic of main vapour pressure.Therefore, be determine that the key of optimization of sliding pressure curve determine by steam turbine by measuring steam turbine high-pressure cylinder efficiency with the change curve of main steam pressure, lowering consumption to power plant for energy conservation has very important meaning.
Determine that the method that optimization of sliding pressure curve method adopts thermal loss of steam turbine rate performance test standard determined by steam turbine at present, because operating condition of test is limited, and test result can not obtain at once, often all fails after off-test to find real optimum value.In addition, the thermal loss of steam turbine rate method of measurement of current employing needs a large amount of high-precision meter, pilot system is complicated, the fault of any major meters table all affects the accuracy of result, and test period compared with long, operating condition of test is many, experimentation cost is large, and test result application affect by change of external conditions.
Summary of the invention
Object of the present invention is intended to for above-mentioned deficiency of the prior art, provide a kind of be applied to the large turbine-generator set of nozzle governing mode determine that the method for optimization of sliding pressure curve determined by steam turbine fast.
Object of the present invention can reach by the following technical programs:
The invention provides a kind of method that optimization of sliding pressure curve determined by steam turbine of determining fast, be applied to the large turbine-generator set of nozzle governing mode, constant by regulating main steam adjustment doors aperture to maintain load, power plant instrumentation is adopted to measure steam turbine high-pressure cylinder import and outlet parameter and main steam flow, and record main steam adjustment doors aperture, calculate the steam turbine high-pressure cylinder efficiency corresponding to this main steam pressure and high-pressure cylinder admission volume flow, comprise the steps:
S1: select any one running on the lower load, maintains the stable about 30min stable with operating condition of test of test load; Under the same load, main steam pressure is regulated to reduce according to the interval of 0.25MPa ~ 0.50MPa from high to low, under each main steam pressure, measure high-pressure cylinder import after parameter stability and outlet parameter is about 10min, calculate high-pressure cylinder efficiency and high-pressure cylinder admission volume flow;
S2: under the load identical with step S1, main steam pressure is regulated to increase according to the interval of 0.25MPa ~ 0.50MPa from low to high, under each main steam pressure, measure high-pressure cylinder import after parameter stability and outlet parameter is about 10min, calculate high-pressure cylinder efficiency and high-pressure cylinder admission volume flow;
S3: the high-pressure cylinder efficiency obtained according to step S1 and step S2 and the corresponding relation matched curve of high-pressure cylinder admission volume flow, find out the mid point of curve high pressure cylinder efficiency change saltation zone, the adjustment doors aperture of the midpoint of this saltation zone is best adjustment doors aperture, and one of unit optimum main steam pressure force value under determining this load thus;
S4: select N number of different load, respectively repeat steps S1 to step S3 obtain N number of different load under best adjustment doors aperture, and the N number of optimum main steam pressure force value under recording corresponding load;
S5: the optimum main steam pressure force data of the N number of different load obtained and correspondence thereof is carried out linear fit and obtains final sliding pressure operation curve.
Described steam turbine high-pressure cylinder import and outlet parameter comprise pressure and temperature respectively, and described main steam flow calculates by methods such as pressure after measurement feedwater flow or governing stage.
Further, when unit operation performance variation and seasonal variations, main steam pressure force value compared to the main steam pressure force value under the corresponding load of former sliding pressure operation curve, its difference, as the Offset of former sliding pressure operation curve, is revised former sliding pressure operation curve.
Further, the formula of described high-pressure cylinder efficiency is:
wherein:
η
hP---high-pressure cylinder efficiency, %;
H
mS---main steam enthalpy, kJ/kg;
H
hE---high-pressure cylinder steam discharge enthalpy, kJ/kg;
H
sH---high-pressure cylinder steam discharge constant entropy enthalpy, kJ/kg.
Further, the formula of described high-pressure cylinder admission volume flow is: V
mS=m
mS/ ρ
mS, wherein:
V
mS---high-pressure cylinder admission volume flow, m
3/ s;
M
mS---main steam flow, kg/s;
ρ
mS---high-pressure cylinder admission density, kg/m
3.
Provided by the inventionly describedly determine that steam turbine determines the method for optimization of sliding pressure curve by data acquisition system service data fast, calculate whole sliding pressure process high-pressure cylinder efficiency curves, just can determine that optimization of sliding pressure curve determined by the optimum valve position of full load traffic coverage turbine high-pressure modulating valve and steam turbine, the method is simple and practical, accurate, greatly can save to obtain and determine optimization of sliding pressure plot against time and curve precision, for power plant saves experimentation cost, the steam turbine real time execution optimization system in thermal power plant can be widely used in.
Accompanying drawing explanation
Fig. 1 is the graph of a relation of steam turbine high-pressure cylinder efficiency under embodiment 1 nozzle governing mode provided by the invention and admission volume flow;
Fig. 2 is that embodiment 2 performance variation provided by the invention and seasonal variations are to the adjusting method schematic diagram of sliding pressure operation curve.
Embodiment
Below in conjunction with accompanying drawing, technological scheme of the present invention is described in further detail:
The invention provides a kind of method that optimization of sliding pressure curve determined by steam turbine of determining fast, be applied to the large turbine-generator set of nozzle governing mode, constant by regulating main steam adjustment doors aperture to maintain load, power plant instrumentation is adopted to measure steam turbine high-pressure cylinder import and outlet parameter and main steam flow, and record main steam adjustment doors aperture, calculate the steam turbine high-pressure cylinder efficiency corresponding to this main steam pressure and high-pressure cylinder admission volume flow, comprise the steps:
S1: select any one running on the lower load, maintains the stable about 30min stable with operating condition of test of test load; Under the same load, main steam pressure is regulated to reduce according to the interval of 0.25MPa ~ 0.50MPa from high to low, under each main steam pressure, measure high-pressure cylinder import after parameter stability and outlet parameter is about 10min, calculate high-pressure cylinder efficiency and high-pressure cylinder admission volume flow;
S2: under the load identical with step S1, main steam pressure is regulated to increase according to the interval of 0.25MPa ~ 0.50MPa from low to high, under each main steam pressure, measure high-pressure cylinder import after parameter stability and outlet parameter is about 10min, calculate high-pressure cylinder efficiency and high-pressure cylinder admission volume flow;
S3: the high-pressure cylinder efficiency obtained according to step S1 and step S2 and the corresponding relation matched curve of high-pressure cylinder admission volume flow, find out the mid point of curve high pressure cylinder efficiency change saltation zone, the adjustment doors aperture of the midpoint of this saltation zone is best adjustment doors aperture, and one of unit optimum main steam pressure force value under determining this load thus;
S4: select N number of different load, respectively repeat steps S1 to step S3 obtain N number of different load under best adjustment doors aperture, and the N number of optimum main steam pressure force value under recording corresponding load;
S5: the optimum main steam pressure force data of the N number of different load obtained and correspondence thereof is carried out linear fit and obtains final sliding pressure operation curve.
Described steam turbine high-pressure cylinder import and outlet parameter comprise pressure and temperature respectively, and described main steam flow calculates by methods such as pressure after measurement feedwater flow or conciliation level.
When unit operation performance variation and seasonal variations, this determines that the method that optimization of sliding pressure curve determined by steam turbine also comprises step S101 fast: main steam pressure force value compared to the main steam pressure force value under the corresponding load of former sliding pressure operation curve, its difference, as the Offset of former sliding pressure operation curve, is revised former sliding pressure operation curve.
The formula of described high-pressure cylinder efficiency is:
wherein:
η
hP---high-pressure cylinder efficiency, %;
H
mS---main steam enthalpy, kJ/kg;
H
hE---high-pressure cylinder steam discharge enthalpy, kJ/kg;
H
sH---high-pressure cylinder steam discharge constant entropy enthalpy, kJ/kg.
The formula of described high-pressure cylinder admission volume flow is: V
mS=m
mS/ ρ
mS, wherein:
V
mS---high-pressure cylinder admission volume flow, m
3/ s;
M
mS---main steam flow, kg/s;
ρ
mS---high-pressure cylinder admission density, kg/m
3.
Embodiment 1
Please refer to Fig. 1, when steam distribution way of steam turbine is nozzle governing, generally control steam turbine throttle flow by four modulating valve.When unit starting and low-load, adopt wherein two modulating valve to open simultaneously, raise with load and open latter two modulating valve successively, thus there is good Primary frequency control ability.Because flow characteristics of regulating valve has very strong non-linear behavior, therefore, high-pressure cylinder efficiency is the basic reason affecting best sliding pressure point with the change curve characteristic of main vapour pressure.
Fig. 1 is the change curve measuring high-pressure cylinder efficiency and admission volume flow and the main vapour pressure obtained under 50%THA operating mode and 65%THA operating mode two different tests loads, when the 3rd modulating valve part opens (control valve opening overlap region, namely according to valve opening order, the non-standard-sized sheet of the valve first opened above, but the valve opened below has started to open), when admission volume flow is about 4.75m3/s, high-pressure cylinder efficiency change rate obviously diminishes.
Theoretical and actual measurement all shows to there will be best main vapour pressure point at high-pressure cylinder efficiency change saltation zone.Further, under different load, all basic mid point occurring saltation zone when identical volume flow of high-pressure cylinder efficiency, under different load is described, best main vapour pressure point will occur under substantially identical valve opening.
Be about near 4.75m3/s in admission volume flow, test main vapour pressure change interval suitably should be reduced to about 0.25MPa, to improve the measuring accuracy of curve.Main vapour pressure change interval can be relaxed to about 0.50MPa in other regions.
Embodiment 2
Due to unit operation performance variation and seasonal variations, under identical turbine inlet main steam flow, steam turbine power generation power can difference to some extent, will certainly affect optimum main steam pressure, therefore, need to adjust sliding pressure operation curve according to unit operation performance variation and seasonal variations.
Please refer to Fig. 2, when unit operation performance variation and seasonal variations, the main steam pressure force value that step S1 records compared to the main steam pressure force value under the corresponding load of former sliding pressure operation curve, its difference, as the Offset of former sliding pressure operation curve, is revised former sliding pressure operation curve.
Sliding pressure operation curve in Fig. 2 Central Plains tests a main steam pressure of acquisition and the relation curve of load in certain season.Along with unit operation performance variation and seasonal variations, under the same load, main steam flow changes, and therefore, needs to revise former sliding pressure operation curve.Offset can just can be born, and usually, different load below-center offset amount difference but little to some extent, in the several loading point often can run, adopts step S101 to determine the Offset of each loading point, calculate the Offset of its mean value as sliding pressure operation curve at unit.
To sum up, provided by the inventionly describedly determine that steam turbine determines the method for optimization of sliding pressure curve by data acquisition system service data fast, calculate whole sliding pressure process high-pressure cylinder efficiency curves, just can determine that optimization of sliding pressure curve determined by the optimum valve position of full load traffic coverage turbine high-pressure modulating valve and steam turbine, the method is simple and practical, accurate, greatly can save to obtain and determine optimization of sliding pressure plot against time and curve precision, for power plant saves experimentation cost, the steam turbine real time execution optimization system in thermal power plant can be widely used in.
Above by reference to the accompanying drawings to invention has been exemplary description; obvious realization of the present invention is not subject to the restrictions described above; as long as have employed the various improvement that method of the present invention is conceived and technological scheme is carried out; or design of the present invention and technological scheme directly applied to other occasion, all in protection scope of the present invention without to improve.
Claims (5)
1. determine that the method for optimization of sliding pressure curve determined by steam turbine fast for one kind, be applied to the large turbine-generator set of nozzle governing mode, it is characterized in that, constant by regulating main steam adjustment doors aperture to maintain load, power plant instrumentation is adopted to measure steam turbine high-pressure cylinder import and outlet parameter and main steam flow, and record main steam adjustment doors aperture, calculate the steam turbine high-pressure cylinder efficiency corresponding to this main steam pressure and high-pressure cylinder admission volume flow, comprise the steps:
S1: select any one running on the lower load, maintains the stable about 30min stable with operating condition of test of test load; Under the same load, main steam pressure is regulated to reduce according to the interval of 0.25MPa ~ 0.50MPa from high to low, under each main steam pressure, measure high-pressure cylinder import after parameter stability and outlet parameter is about 10min, calculate high-pressure cylinder efficiency and high-pressure cylinder admission volume flow;
S2: under the load identical with step S1, main steam pressure is regulated to increase according to the interval of 0.25MPa ~ 0.50MPa from low to high, under each main steam pressure, measure high-pressure cylinder import after parameter stability and outlet parameter is about 10min, calculate high-pressure cylinder efficiency and high-pressure cylinder admission volume flow;
S3: the high-pressure cylinder efficiency obtained according to step S1 and step S2 and the corresponding relation matched curve of high-pressure cylinder admission volume flow, find out the mid point of curve high pressure cylinder efficiency change saltation zone, the adjustment doors aperture of the mid point of this saltation zone is best adjustment doors aperture, and one of unit optimum main steam pressure force value under determining this load thus;
S4: select N number of different load, respectively repeat steps S1 to step S3 obtain N number of different load under best adjustment doors aperture, and the N number of optimum main steam pressure force value under recording corresponding load;
S5: the optimum main steam pressure force data of the N number of different load obtained and correspondence thereof is carried out linear fit and obtains final sliding pressure operation curve.
2. a kind of method that optimization of sliding pressure curve determined by steam turbine of determining fast according to claim 1, it is characterized in that, described steam turbine high-pressure cylinder import and outlet parameter comprise pressure and temperature respectively, and described main steam flow calculates by the method for pressure after measurement feedwater flow or governing stage.
3. a kind of method that optimization of sliding pressure curve determined by steam turbine of determining fast according to claim 1, is characterized in that, also comprise:
S101: when unit operation performance variation and seasonal variations, compares main steam pressure force value to the main steam pressure force value under the corresponding load of former sliding pressure operation curve, and its difference, as the Offset of former sliding pressure operation curve, is revised former sliding pressure operation curve.
4. a kind of method that optimization of sliding pressure curve determined by steam turbine of determining fast according to claim 1, it is characterized in that, the formula of described high-pressure cylinder efficiency is:
wherein:
η
hP---high-pressure cylinder efficiency, %;
H
mS---main steam enthalpy, kJ/kg;
H
hE---high-pressure cylinder steam discharge enthalpy, kJ/kg;
H
sH---high-pressure cylinder steam discharge constant entropy enthalpy, kJ/kg.
5. a kind of method that optimization of sliding pressure curve determined by steam turbine of determining fast according to claim 1, is characterized in that, the formula of described high-pressure cylinder admission volume flow is: V
mS=m
mS/ ρ
mS, wherein:
V
mS---high-pressure cylinder admission volume flow, m
3/ s;
M
mS---main steam flow, kg/s;
ρ
mS---high-pressure cylinder admission density, kg/m
3.
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| CN104632302B (en) * | 2015-01-05 | 2016-01-20 | 广东电网有限责任公司电力科学研究院 | A kind of condensing steam turbine sliding pressure operation curve test/implementation methods |
| CN105225008A (en) * | 2015-10-08 | 2016-01-06 | 苏州西热节能环保技术有限公司 | A kind of method predicting thermodynamic system of steam tur internal operation parameter |
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