CN104034521A - New method for measuring turbine valve flow characteristics - Google Patents
New method for measuring turbine valve flow characteristics Download PDFInfo
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- CN104034521A CN104034521A CN201410217582.9A CN201410217582A CN104034521A CN 104034521 A CN104034521 A CN 104034521A CN 201410217582 A CN201410217582 A CN 201410217582A CN 104034521 A CN104034521 A CN 104034521A
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Abstract
The invention provides a new method for measuring turbine valve flow characteristics. The method is used for obtaining more accurate valve flow characteristics and improving the cyclic duty capacity of a unit; under a new characteristic curve, a main-steam sliding pressure curve can be further optimized, and under low loads, coal consumption can be reduced (including measures such as optimizing the main-steam sliding pressures); as a result, the method has considerable economic benefit.
Description
Technical field
The present invention relates to a kind of assay method, be specifically related to a kind of new steam turbine valve discharge characteristic assay method.
Background technology
The most of DEH of employing of thermal power generation unit steam turbine controls at present, and DEH system provides management valve and single valve/sequence valve handoff functionality.Valve flow characteristic curve is exactly valve opening and the corresponding relation that passes through the steam flow of valve, if DEH system valve rating curve differs larger with actual valve flow, when unit varying load and primary frequency modulation, may there is sudden load change and regulate problem slowly.The calculating of main steam flow at present adopts Fu Liugeer formula more:
: steam flow before variable working condition; G1: steam flow after variable working condition;
: first pressing after variable working condition, MPa;
: first pressing before variable working condition, MPa;
: back pressure before variable working condition, MPa;
: back pressure after variable working condition, MPa;
: vapor (steam) temperature before variable working condition, ℃;
: vapor (steam) temperature after variable working condition, ℃;
Through power plant's long-run test, find, the valve flow characteristic curve that adopts these computing method to optimize, can not reflect accurately flow, thereby cause irrational control valve degree of overlapping can affect unit varying load ability.Under sequence valve mode, easily produce larger sudden load change when varying load and primary frequency modulation, even cause that steam turbine shafting vibration changes, and has had a strong impact on security and the economy of unit.
Calculate the valve flow characteristic curve that suits unit actual conditions, make unit more steady at single valve/sequence valve handoff procedure, load disturbance is less, strengthens the ability of unit varying load and primary frequency modulation.
Summary of the invention
The object of the present invention is to provide a kind of new steam turbine valve discharge characteristic assay method.
For achieving the above object, the technical solution used in the present invention is:
A kind of new steam turbine valve main steam flow assay method: gather following parameter: steam flow
, first pressing after variable working condition
, first pressing before variable working condition
, back pressure before variable working condition
, back pressure after variable working condition
, vapor (steam) temperature before variable working condition
with vapor (steam) temperature after variable working condition
, be brought in formula (1) and calculate:
（1）；
In formula:
--steam flow before variable working condition;
Steam flow after G1--variable working condition;
--first pressing after variable working condition, MPa;
--first pressing before variable working condition, MPa;
--back pressure before variable working condition, MPa;
--back pressure after variable working condition, MPa;
--vapor (steam) temperature before variable working condition, ℃;
--vapor (steam) temperature after variable working condition, ℃;
--first pressure difference before and after variable working condition, MPa.
Compared with prior art, the beneficial effect that the present invention obtains is:
Assay method of the present invention makes valve flow characteristic more accurate, improve unit varying load ability, under new family curve, can further optimize main vapour pressure sliding pressure curve, under underload, can reduce coal consumption (comprising by optimizing the measures such as main vapour pressure sliding pressure), there is appreciable economic benefit.
Accompanying drawing explanation
Fig. 1 is the former family curve of sequence valve mode lower valve flow and new features curve comparison figure.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in more detail.
Take certain 600MW power generator turbine valve characteristic is example, by sequence valve mode lower valve Flow characteristic test data after arranging as following table 1, wherein flow difference refers to the difference of flow instruction and calculated flow rate.As can be seen from the table, when current flow instruction is in 68% left and right, 70%～75%, during 81%～87% this three sections, and between the valve calculated flow rate calculating, difference is larger, when particularly flow instruction changes to 72.1% from 68%, the difference of calculated flow rate changes to-4.2% from 9.3%.During test, under each flow instruction, unit load accounts for the ratio of rated power, more approaching with the valve calculated flow rate calculating, and differs larger with current flow instruction.This has absolutely proved that current sequence valve control mode lower valve rating curve and actual conditions seriously misfit.
According to test figure, through Rational Simplification, projection, calculate and choose suitable degree of overlapping, we simulate under the sequence valve mode more identical with actual conditions and optimize late gate discharge characteristic function as following table 2, and before and after optimizing, valve characteristic curve figure contrast as shown in Figure 1.
For a unit, as the overshoot of may loading of fruit part section, milder than actual curve at another part section so, this unit also has quite a few section when increasing flow instruction, to there is no that load increases, and this equally can affect the performance of unit when dropping into AGC and primary frequency modulation.
This unit adopts after the valve flow characteristic curve after optimizing, the stability of controlling is obviously improved, the stable of load also makes the burning of boiler more stable, and the primary frequency modulation that always can not drop in the past also can normally drop into, and the followability that AGC load is controlled is significantly improved.
Because unit only just exists and changes energy-conservation situation by valve flow characteristic curve under sequence valve mode, table 3 is under sequence valve control mode, the valve opening situation of unit under 60-80% load:
In former characteristic situation, from 180MW～240MW section, all there is the situation of three pitch throttlings, in unit actual motion, in order to avoid flow saltation zone, be typically chosen in CV1, CV2 aperture 62%, variable-pressure operation under the operating mode of CV3 aperture 11% (under other operating mode, because pitch throttling exists the unsettled situation of shafting vibration).In new characteristic situation, by reducing the degree of overlapping of CV1, CV2 and CV3, generally only be chosen in CV1, CV2 opening ratio is larger, the operating mode operation of CV3 complete shut-down, reduced by a pitch throttling, add and under new family curve, can further optimize main vapour pressure sliding pressure curve, under underload, can reduce the coal consumption (comprising by optimizing the measures such as main vapour pressure sliding pressure) of 2g/KWh, there is appreciable economic benefit.
The above embodiment is only the preferred embodiments of the present invention, and is not the exhaustive of the feasible enforcement of the present invention.For persons skilled in the art, any apparent change of under the prerequisite that does not deviate from the principle of the invention and spirit, it having been done, within all should being contemplated as falling with claim protection domain of the present invention.
Claims (1)
1. a new steam turbine valve main steam flow assay method: it is characterized in that: gather following parameter: steam flow
, first pressing after variable working condition
, first pressing before variable working condition
, back pressure before variable working condition
, back pressure after variable working condition
, vapor (steam) temperature before variable working condition
with vapor (steam) temperature after variable working condition
, be brought in formula (1) and calculate:
（1）；
In formula:
--steam flow before variable working condition;
Steam flow after G1--variable working condition;
--first pressing after variable working condition, MPa;
--first pressing before variable working condition, MPa;
--back pressure before variable working condition, MPa;
--back pressure after variable working condition, MPa;
--vapor (steam) temperature before variable working condition, ℃;
--vapor (steam) temperature after variable working condition, ℃;
--first pressure difference before and after variable working condition, MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410217582.9A CN104034521A (en) | 2014-05-22 | 2014-05-22 | New method for measuring turbine valve flow characteristics |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410217582.9A CN104034521A (en) | 2014-05-22 | 2014-05-22 | New method for measuring turbine valve flow characteristics |
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| CN104034521A true CN104034521A (en) | 2014-09-10 |
Family
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| CN201410217582.9A Pending CN104034521A (en) | 2014-05-22 | 2014-05-22 | New method for measuring turbine valve flow characteristics |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104200121A (en) * | 2014-09-19 | 2014-12-10 | 国家电网公司 | Valve flow function optimization method based on unit operation data |
| CN105240058A (en) * | 2015-11-06 | 2016-01-13 | 国网河南省电力公司电力科学研究院 | Steam turbine flow curve identifying and optimizing method based on spray nozzle flow calculation |
| CN105275508A (en) * | 2015-11-06 | 2016-01-27 | 国网河南省电力公司电力科学研究院 | Steam turbine flow curve identification and optimization method based on power value calculation |
| CN105317476A (en) * | 2015-11-06 | 2016-02-10 | 国网河南省电力公司电力科学研究院 | Turbine flow curve identification and optimization method based on feature flow area |
| CN110646193A (en) * | 2018-10-18 | 2020-01-03 | 上海明华电力技术工程有限公司 | Test method for obtaining flow characteristic of high-pressure regulating valve of steam turbine |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104200121A (en) * | 2014-09-19 | 2014-12-10 | 国家电网公司 | Valve flow function optimization method based on unit operation data |
| CN105240058A (en) * | 2015-11-06 | 2016-01-13 | 国网河南省电力公司电力科学研究院 | Steam turbine flow curve identifying and optimizing method based on spray nozzle flow calculation |
| CN105275508A (en) * | 2015-11-06 | 2016-01-27 | 国网河南省电力公司电力科学研究院 | Steam turbine flow curve identification and optimization method based on power value calculation |
| CN105317476A (en) * | 2015-11-06 | 2016-02-10 | 国网河南省电力公司电力科学研究院 | Turbine flow curve identification and optimization method based on feature flow area |
| CN105240058B (en) * | 2015-11-06 | 2017-03-22 | 国网河南省电力公司电力科学研究院 | Steam turbine flow curve identifying and optimizing method based on spray nozzle flow calculation |
| CN110646193A (en) * | 2018-10-18 | 2020-01-03 | 上海明华电力技术工程有限公司 | Test method for obtaining flow characteristic of high-pressure regulating valve of steam turbine |
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Application publication date: 20140910 |
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