CN106761969A - A kind of measures conversion method of steam turbine flow - Google Patents
A kind of measures conversion method of steam turbine flow Download PDFInfo
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- CN106761969A CN106761969A CN201611029485.2A CN201611029485A CN106761969A CN 106761969 A CN106761969 A CN 106761969A CN 201611029485 A CN201611029485 A CN 201611029485A CN 106761969 A CN106761969 A CN 106761969A
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- steam turbine
- back pressure
- pressure value
- value
- load
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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
Abstract
The invention particularly discloses a kind of measures conversion method of steam turbine flow, this programme has opened up the frontier of Turbine Safety operating parameter setting, employs a kind of brand-new control method and steam turbine is controlled.Step one is that the highest operation back pressure value and minimum operation back pressure value of steam turbine are defined, it is ensured that steam turbine is perfectly safe；Step 2 and step 3 are the technical methods by using interval setting, and the safe operating area to steam turbine limits, and obtains the operation area that is perfectly safe of steam turbine；Step four fundamental rules are that the operation area that is perfectly safe of steam turbine is input into the control system of steam turbine so that this programme can be directly applied in the control of steam turbine, it is ensured that this programme is smoothly carried out.
Description
Technical field
The present invention relates to steam turbine technology field, and in particular to a kind of measures conversion method of steam turbine flow.
Background technology
China's air-cooled type steam turbine is mainly used in thermal power industry, and the power of the assembling unit is main to divide typically in more than 200MW
It is distributed in the place of water resources shortage.Air-cooled type steam turbine is different from conventional clammy formula steam turbine, Er Qiepai high with exhaust temperature
Stripping temperature with the excursion of ambient air temperature it is larger the characteristics of.Because delivery temperature tc=atmospheric temperature ta+ initial temperature differences
ITD, the wherein general value of initial temperature differences ITD values are >=30 DEG C, therefore, with the change of ambient air temperature（Particularly summer in winter
The morning and evening temperature difference it is big）, exhaust temperature will fluctuation.When exhaust temperature is raised, the specific volume of steam declines, the volume flow of steam discharge
Amount will be reduced, and certainly will cause a series of safety for jeopardizing unit operation such as steam turbine last stage air blast, the exhaust stage blade separation of flow, flutter
The problems such as.Therefore, it is necessary to limit the steam discharge parameter of steam turbine.
Turbine rotor is constituted by by multi-stage impeller, and every grade of impeller is respectively arranged with movable vane piece, the main test of exhaust pressure height
Exhaust stage blade（Blade on steam turbine afterbody impeller）Security.At present, the steam discharge parameter limitation of air-cooled type steam turbine
Mode be：Limit highest operation back pressure and the minimum operation back pressure two values of air-cooled type steam turbine（Back pressure：I.e. steam turbine is arranged
Steam pressure）, and the highest of steam turbine operation back pressure and minimum operation back pressure can change with the change of turbine discharge amount：When
When displacement is reduced, in the case where final stage volume flow is constant, steam specific volume need to accordingly increase, and exhaust steam pressure can also drop therewith
It is low), and, fuel combustion value that current air-cooled type steam turbine is used is simultaneously unstable, so, fuel will also result in steam turbine
Air inflow change, the cause displacement of steam turbine changes so that steam turbine just cannot be for a long time according to rated load operation.
Therefore, if according to the current method of operation of conventional air-cooled type steam turbine, only by limit highest run back pressure and
Minimum operation back pressure two values are controlled being put into steam discharge parameter to air-cooled type steam turbine, and effect is unsatisfactory, because working as
When the displacement of steam turbine is reduced, performing low-load running of machine set, highest operation back pressure and minimum operation back pressure are bigger than normal, steam turbine last stage
Overblow state or the limit beyond acting ability are early had been enter into, the safe operation of steam turbine will be jeopardized.
The content of the invention
The purpose of the present invention is in view of the shortcomings of the prior art, there is provided a kind of measures conversion method of steam turbine flow, makes vapour
The displacement of turbine is still capable of the operation of safety in the case of being continually changing.
To reach above-mentioned purpose, base case of the invention is：A kind of measures conversion method of steam turbine flow, including such as
Lower step：Step one is to set the safe operation load of steam turbine and calculate steam turbine according to the safe operation load gauge of setting
Highest operation back pressure value and the minimum operation back pressure value of regulation needed for normal operation；Step 2 is according in safe operation load
Between point value and determined in each middle point value steam turbine highest operation back pressure value and minimum operation back pressure value；Step 3 is
According to unit flow and load, minimum extraction flow restraining line, highest exhaust steam pressure restraining line, minimum exhaust pressure are drawn out respectively
Power（Obstruction back pressure）Line, peak power restraining line and maximum extraction flow restraining line, while each line segment is connected can form vapour
Turbine can operation area；Step 4 be using in step 3 can operation area as the safe operating area of steam turbine, with vapour
The readable form of turbine control system is input into the control system of steam turbine.
The operation principle and advantage of this programme be：This programme has opened up the new neck of Turbine Safety operating parameter setting
Domain, employs a kind of brand-new control method and steam turbine is controlled.Step one is to run back pressure value to the highest of steam turbine
It is defined with minimum operation back pressure value, it is ensured that steam turbine is perfectly safe；Step 2 and step 3 are by using interval
The technical method of setting, the safe operating area to steam turbine limits, and obtains the operation area that is perfectly safe of steam turbine；Step
Rapid four fundamental rules are that the operation area that is perfectly safe of steam turbine is input into the control system of steam turbine so that this programme can be applied directly
In the control of steam turbine, it is ensured that this programme is smoothly carried out.
This programme is different with traditional steam turbine control method, employs the steam turbine point value that Region control has broken routine
Control mode, it is ensured that the various operational factors of steam turbine can be in the operational envelope of steam turbine, be conventional steamer
What the point value control method of machine to be compared.Meanwhile, using above method step, because to the parameters of steam turbine（Such as
Highest operation back pressure, minimum operation back pressure, peak power and displacement etc.）Security settings control has been carried out, therefore, even if
Because external factor, such as fire coal cause the air inflow of steam turbine to change or numerical fluctuations, in safe operating area
Interior, the overall operation performance of steam turbine will not occur larger change, therefore, steamer function is constantly in the shape of safe operation
State, otherwise steam turbine will autostop itself be not damaged with protecting.
Further, the safe operation load range value in step one is 0.2 times of rated load~1.1 times rated load.This
In the range of rated load can make steam turbine exhaust steam pressure fluctuate it is smaller, while the measured value of extraction flow fall within stabilization
The scope of runtime value, more precisely effective control can be carried out using above range value to steam turbine.
Further, step 2 includes being measured the low plus extraction pressure of steam turbine, by low plus extraction pressure meter
Calculate middle point value, highest operation back pressure value and the minimum operation back pressure value of safe operation load.This prioritization scheme is disclosed
The middle point value of safe operation load, highest are determined by the low plus extraction pressure of steam turbine and runs back pressure value and minimum operation
The method of back pressure value, shows by applicant's experiment, is not only facilitated very much by determining low plus extraction pressure, and can be very
Accurately reflect each safe operation parameter of steam turbine, improve the operational reliability of steam turbine.
Further, step 2 includes being measured the displacement of steam turbine, and safe operation is calculated by displacement
The middle point value of load, highest operation back pressure value and minimum operation back pressure value.This prioritization scheme is disclosed by steam turbine
The method that displacement determines the middle point value of safe operation load, highest operation back pressure value and minimum operation back pressure value, passes through
Applicant's experiment shows that the measure of displacement is more direct compared to for the measure of low plus extraction pressure, determines numerical value very smart
Standard, therefore can the extraordinary safe operating area for limiting steam turbine, the operational reliability of raising steam turbine.
Brief description of the drawings
Fig. 1 is the Turbine Safety operation area figure by determining displacement restriction in the embodiment of the present invention；
Fig. 2 is the Turbine Safety operation area figure by determining the restriction of low plus extraction pressure in the embodiment of the present invention.
Specific embodiment
Below by specific embodiment, the present invention is further detailed explanation：
Embodiment is substantially as depicted in figs. 1 and 2：A kind of measures conversion method of steam turbine flow, step one is setting steam turbine
Safe operation load（0.2 times of rated load≤safe operation load≤1.1 times rated load）, calculate steam turbine and normally transport
Highest operation back pressure value and the minimum operation back pressure value of regulation needed for row；Step 2 is to choose the intermediate point of safe operation load
Value and determined in each middle point value steam turbine highest operation back pressure value and minimum operation back pressure value；Step 3 is basis
Unit flow and load, draw out minimum extraction flow restraining line, highest exhaust steam pressure restraining line, minimum pressure at expulsion respectively
（Obstruction back pressure）Line, peak power restraining line and maximum extraction flow restraining line, while each line segment is connected can form steamer
Machine can operation area；Step 4 be using in step 3 can operation area as the safe operating area of steam turbine, with steamer
The readable form of machine control system is input into the control system of steam turbine, and steam turbine does dock during beyond safe operating area
Reason, to ensure that Turbine Safety reliably runs.
As shown in Figure 1：When steam turbine is 0.2 times of rated load, calculating corresponding highest operation back pressure value is
12kpa（a）, corresponding minimum operation back pressure value is calculated for 2.5 kpa（a）；When steam turbine is 1.1 times of rated loads (row
Vapour amount 120t/h) when, it is 53.5kpa to calculate corresponding highest operation back pressure value（a）, calculate corresponding minimum operation
Back pressure value is 27kpa（a）.Then choose respectively when displacement is 42.5（t/h）、50（t/h）、70（t/h）、80（t/h）、90
（t/h）、100（t/h）、107（t/h）And 113（t/h）When highest operation back pressure value and minimum operation back pressure value as special
Point value, forms highest exhaust steam pressure and minimum exhaust steam pressure（Obstruction back pressure）Corresponding point value.According to unit flow and load,
Minimum extraction flow restraining line, highest exhaust steam pressure restraining line, minimum pressure at expulsion are drawn out respectively（Obstruction back pressure）Line, maximum
Power limit line and maximum extraction flow restraining line（As shown in Figure 1）, finally each line segment is connected can form steam turbine can
Operation area, by it is above-mentioned can operation area be input into the control system of steam turbine in the readable form of steam turbine control system,
Show by applicant's actual motion, steam turbine can under the scope of operation area, even if choosing different fuel, steam turbine according to
So can safely, reliably run.
As depicted in figs. 1 and 2：For the displacement of more accurate measurement steam turbine, the flow parameter of steam turbine is turned
Turn to pressure parameter：According to the characteristics of steam turbine itself, turbine discharge amount is low with steam turbine plus extraction pressure is similar to direct ratio
Relation（According to Fl ü gel Fu Liugeer formula ≈）, converted by the numerical value of the low plus extraction pressure to measurement, and then
Corresponding displacement is calculated to reach the accurate purpose of the numerical measuring of displacement.As depicted in figs. 1 and 2, when displacement
Choosing point value is： 30（t/h）、43（t/h）、50（t/h）、70（t/h）、80（t/h）、90（t/h）、100（t/h）、107（t/
h）、113（t/h）When, corresponding calculated low plus extraction pressure value is respectively 0.0275（MPa（a））、
0.0388（MPa（a））、0.0448（MPa（a））……0.1128（MPa（a））, then now determine again above-mentioned each low plus take out
Operation back pressure value and minimum operation back pressure value high under steam pressure, according to unit flow and load, draw out minimum again respectively
Extraction flow restraining line, highest exhaust steam pressure restraining line, minimum pressure at expulsion（Obstruction back pressure）Line, peak power restraining line one-level
Maximum extraction flow restraining line（As shown in Figure 2）, finally by each line segment be connected can be formed steam turbine can operation area, will be above-mentioned
Can operation area be input into the control system of steam turbine in the readable form of steam turbine control system, transported by applicant is actual
Row shows, steam turbine can under the scope of operation area, even if choosing different fuel, steam turbine still can safely, can
By ground operation.
Drawn by Fig. 1 and Fig. 2, the steam turbine shown in Fig. 1 can operation area and the steam turbine shown in Fig. 2 run
Regional extent is completely overlapped, therefore, can be learnt by above-mentioned：It is measured by low plus extraction pressure, can be very accurate
The extraction flow numerical value of true measure steam turbine, and then show that vapour can be limited by the measure numerical value to low plus extraction pressure
Parameter needed for the safe operation of turbine, such that it is able to be used for being controlled steam turbine, improves the operational reliability of steam turbine.
Above-described is only embodiments of the invention, it is noted that for a person skilled in the art, is not being taken off
On the premise of present inventive concept, some deformations and improvement can also be made, these should also be considered as protection scope of the present invention,
These effects and practical applicability for implementing all without the influence present invention.This application claims protection domain should be with its right
It is required that content be defined, specific embodiment in specification etc. record can be used for explain claim content.
Claims (4)
1. a kind of measures conversion method of steam turbine flow, it is characterised in that comprise the following steps：
Step one is to set the safe operation load of steam turbine and to calculate steam turbine normal according to the safe operation load gauge of setting
Highest operation back pressure value and the minimum operation back pressure value of regulation needed for operation；
Step 2 is the middle point value according to safe operation load and the highest operation of steam turbine is determined in each middle point value
Back pressure value and minimum operation back pressure value；
Step 3 is, according to unit flow and load, minimum extraction flow restraining line, the limitation of highest exhaust steam pressure to be drawn out respectively
Line, minimum exhaust line pressure, peak power restraining line and maximum extraction flow restraining line, while each line segment is connected can be formed
Steam turbine can operation area；
Step 4 be using in step 3 can operation area as the safe operating area of steam turbine, can with steam turbine control system
The form of reading is input into the control system of steam turbine.
2. the measures conversion method of a kind of steam turbine flow according to claim 1, it is characterised in that in the step one
Safe operation load range value be 0.2~1.1 times of rated load.
3. the measures conversion method of a kind of steam turbine flow according to any one of claim 1 to 2, it is characterised in that
The step 2 includes being measured the low plus extraction pressure of steam turbine, and safe operation is calculated by low plus extraction pressure
The middle point value of load, highest operation back pressure value and minimum operation back pressure value.
4. the measures conversion method of a kind of steam turbine flow according to any one of claim 1 to 2, it is characterised in that
The step 2 includes being measured the displacement of steam turbine, and the intermediate point of safe operation load is calculated by displacement
Value, highest operation back pressure value and minimum operation back pressure value.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611029485.2A CN106761969B (en) | 2016-11-22 | 2016-11-22 | A kind of measures conversion method of steam turbine flow |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611029485.2A CN106761969B (en) | 2016-11-22 | 2016-11-22 | A kind of measures conversion method of steam turbine flow |
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| CN106761969A true CN106761969A (en) | 2017-05-31 |
| CN106761969B CN106761969B (en) | 2018-03-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113356941A (en) * | 2021-06-18 | 2021-09-07 | 华能营口仙人岛热电有限责任公司 | Method, device and medium for controlling operation of 50MW back-pressure turbine |
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| JP2006009672A (en) * | 2004-06-25 | 2006-01-12 | Hitachi Ltd | Method and apparatus for controlling private power generation plant |
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| US20160305342A1 (en) * | 2015-04-14 | 2016-10-20 | General Electric Company | Application of probabilistic control in gas turbine tuning for fuel flow-power output parameters, related control systems, computer program products and methods |
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2016
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006009672A (en) * | 2004-06-25 | 2006-01-12 | Hitachi Ltd | Method and apparatus for controlling private power generation plant |
| JP2007100621A (en) * | 2005-10-06 | 2007-04-19 | Chugoku Electric Power Co Inc:The | Stop control method for pressurized fluidized bed plant |
| CN103063436A (en) * | 2012-12-25 | 2013-04-24 | 河北省电力建设调整试验所 | Turbine heat consumption rate index calculation result judgment method |
| US20160305342A1 (en) * | 2015-04-14 | 2016-10-20 | General Electric Company | Application of probabilistic control in gas turbine tuning for fuel flow-power output parameters, related control systems, computer program products and methods |
| CN105157763A (en) * | 2015-09-17 | 2015-12-16 | 中国能源建设集团广东省电力设计研究院有限公司 | Measurement method and measurement system for main steam flow of gas-steam combined cycle power plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113356941A (en) * | 2021-06-18 | 2021-09-07 | 华能营口仙人岛热电有限责任公司 | Method, device and medium for controlling operation of 50MW back-pressure turbine |
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| CN106761969B (en) | 2018-03-02 |
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