CN102635565A - Method for dynamically biasing anti-surge curve of turbine compressor - Google Patents
Method for dynamically biasing anti-surge curve of turbine compressor Download PDFInfo
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- CN102635565A CN102635565A CN2012100904613A CN201210090461A CN102635565A CN 102635565 A CN102635565 A CN 102635565A CN 2012100904613 A CN2012100904613 A CN 2012100904613A CN 201210090461 A CN201210090461 A CN 201210090461A CN 102635565 A CN102635565 A CN 102635565A
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Abstract
The invention discloses a method for dynamically biasing an anti-surge curve of a turbine compressor. The method includes setting a surge curve of the turbine compressor, the anti-surge curve and an anti-surge early warning curve in an anti-surge controller; acquiring operating condition points A1 and A1' of the turbine compressor; judging whether the A1 is positioned above the anti-surge early warning curve L3 or not, and continuing acquiring of the A1 is positioned above the anti-surge early warning curve L3; adopting the A1' as an operating condition point A1 of a next cycle if the first A1 is not positioned above the anti-surge early warning curve L3, and continuing acquiring; judging whether an operating condition is far away from the anti-surge curve or not; continuing acquiring if the operating condition is far away from the anti-surge curve; and comparing time T with preset time judgment values T1 and T2 if the operating condition is not far away from the anti-surge curve. The anti-surge curve is dynamically biased so as to move opposite to the operating condition points on the basis of the movement speeds of the operating condition points, the operating condition points of the turbine compressor are timely, preliminarily and accurately adjusted and controlled by the anti-surge controller, accordingly, the operating condition points are prevented from entering a surge area, potential safety hazards of running of the turbine compressor are effectively eliminated, and normal operation of the turbine compressor and a production device is guaranteed.
Description
Technical field
The invention belongs to the automation field of compressor, be specifically related to a kind of method of turbocompressor anti-surge curve dynamic bias.
Technical background
Surge be turbocompressor itself intrinsic characteristic, turbocompressor constantly raises in exhaust pressure, under the ever-reduced situation of extraction flow, will get into the surging condition operation.When turbocompressor gets into surging condition; Violent variation can take place in its operating conditions; Be that turbocompressor extraction flow, pressure at first can sharply reduce, if the volume of tooling and pipe network is bigger, exhaust pressure then can not reduce rapidly; The exhaust pressure of turbocompressor is less than the ductwork pressure of tooling at this moment; Air-flow will flow backwards to turbocompressor from tooling, is lower than the exhaust pressure of turbocompressor up to the ductwork pressure of tooling, and turbocompressor just will continue to the exhaust once more of tooling pipe network; Can occur subsequently that the turbocompressor exhaust pressure constantly raises, the ever-reduced situation of extraction flow, when the turbocompressor exhaust pressure is lower than the tooling ductwork pressure, can occurs gas again and flow backwards; So go round and begin again; Violent vibration can take place in turbocompressor, solves if can not in time take effective measures, and the bearing of turbocompressor, sealing can be destroyed; When serious even the mutual friction mutually of rotor and fixed element takes place, cause serious accident.
For guaranteeing that turbocompressor does not get into the surging condition operation at run duration, the control system of every cover turbocompressor group all is provided with antisurge control system.As shown in Figure 1, the turbocompressor antisurge control system comprises surge-proofing controller 2, turbocompressor inlet pressure PT1, temperature T E, flow or throttling arrangement differential pressure PdT, turbocompressor outlet pressure PT2, each measuring device of rotating speed SE of anti-surge valve 3, control anti-surge valve 3 apertures.The temperature and pressure compensation that the turbocompressor inlet pressure PT1 that surge-proofing controller 2 is detected, temperature T E are used for the anti-surge curve, the turbocompressor running operating point is confirmed by the inlet flow rate Q that is detected or rotation speed n and outlet pressure P or pressure ratio ε.
Turbocompressor is under normal operation situation; As long as surge-proofing controller 2 is provided with rational anti-surge curve; Can detect turbocompressor operating conditions accurately; Just can steadily, effectively regulate the operating conditions of turbocompressor, avoid turbocompressor to get into the surging condition operation through control to anti-surge valve 3.But work as tooling or relevant devices such as medium transport pipeline, valve and abnormal operation or fault occur; Cause the rapid change of processing pipe network resistance; Then can make the turbocompressor operating conditions to the rate travel of the anti-surge curve rate travel during considerably beyond normal operation; And conventional Anti-surge Control function has only when turbocompressor running operating point A1 arrives anti-surge curve L2, and surge-proofing controller 2 just can play the Anti-surge Control function.Therefore; This action of turbocompressor anti-surge will occur and lag behind; The turbocompressor running operating point inevitably can surmount surge curve and get into surge region; Cause turbocompressor surge operation, work the mischief to turbocompressor, simultaneously also can deleterious impact to the smooth running of tooling.
Therefore; Study a kind ofly can undergo mutation in the tooling running state, relevant device breaks down or the situation of improper operation under realize Anti-surge Control in time, in advance, accurately drop into, prevent that the method that turbocompressor gets into the surge region operation from being very to be necessary.
Summary of the invention
Defective or deficiency to above-mentioned existing technology existence; The objective of the invention is to; A kind of method of turbocompressor anti-surge curve dynamic bias is provided, at first sets up turbocompressor anti-surge early warning curve, when the running operating point of turbocompressor surmounts anti-surge early warning curve and fast when the anti-surge curve moves; Rate travel with running operating point is a foundation; Dynamic bias anti-surge curve moves itself and running operating point in opposite directions, realizes surge-proofing controller in time, in advance, exactly the turbocompressor running operating point is made preconditioning control, thereby prevents that running operating point from getting into surge region; Potential safety hazard with effective elimination turbocompressor operation guarantees the normal operation of turbocompressor and process units.
In order to achieve the above object, the present invention adopts following technical solution:
A kind of method of turbocompressor anti-surge curve dynamic bias is characterized in that, specifically comprises the steps:
Step 1: surge curve L1, anti-surge curve L2 and anti-surge early warning curve L3 that turbocompressor is set in surge-proofing controller; Wherein, anti-surge early warning curve L3 is obtained by the downward translation of anti-surge curve L2;
Step 2: the Δ T that sets interval, Δ T get 200～500 milliseconds;
Step 3: gather operating conditions by surge-proofing controller (2), obtain running operating point A1;
Step 4: collect the interval delta T time behind the running operating point A1, gather operating conditions once more, obtain running operating point A1 ' by surge-proofing controller;
Step 5: judge whether running operating point A1 is in the top of anti-surge early warning curve L3, if then execution in step 6; Otherwise,, return step 4 pair operating conditions then and continue to gather the running operating point A1 of running operating point A1 ' as next cycle criterion;
Step 6: surge-proofing controller judges that according to the relative position of running operating point A1 and running operating point A1 ' whether operating conditions is away from anti-surge curve L2; Be that then the turbocompressor operation is normal,, return step 4 pair operating conditions and continue to gather the running operating point A1 of running operating point A1 ' as next cycle criterion; Otherwise surge-proofing controller utilizes formula 1,2 to calculate running operating point A1 and moves to anti-surge curve L2 needed time T with current motion speed Δ V,
Δ V=S1/ Δ T (formula 1)
T=S/ Δ V=Δ T*S/S1; (formula 2)
Wherein, S is the distance of running operating point A1 apart from the Y direction of anti-surge curve L2, and S1 is the distance of the Y direction between running operating point A1 and the running operating point A1 ', and Δ T is the time lag;
Step 7: time T that the real-time comparison step 6 of surge-proofing controller obtains and predefined time judgment value T1, T2; If T＜T1, the current anti-surge curve of anti-surge curve L2 ' replacement that then calculates with formula 3,4 with the running operating point A1 of running operating point A1 ' as next cycle criterion, returns step 4 then; If T＞T2, the current anti-surge curve of anti-surge curve L2 replacement that then is provided with step 1 with the running operating point A1 of running operating point A1 ' as next cycle criterion, returns step 4 then; If T1≤T≤T2, then current anti-surge curve remains unchanged in the surge-proofing controller, with the running operating point A1 of running operating point A1 ' as next cycle criterion, returns step 4 then;
L2=f (P, Q) (formula 3)
L2 '=f (P-S/T, Q) (formula 4)
Wherein, Q is an inlet flow rate, and P is an outlet pressure; Δ V is the rate travel of running operating point A1 to anti-surge curve L2; Δ T is the time lag; T moves to anti-surge curve L2 needed time for running operating point A1; L1 is a surge curve; L2, L2 ' are the anti-surge curve.
Further, anti-surge early warning curve L3 is 7%～15% by the nargin coefficient of the downward translation of anti-surge curve L2 in the said step 1.
Further, the time judgment value T1 in the said step 7 is 10 seconds, and T2 is 15 seconds.
Description of drawings
Fig. 1 is the structural representation of turbocompressor Surge Prevention System.
Fig. 2 is the position view of the running operating point A1 under turbocompressor surge curve L1, anti-surge curve L2, anti-surge early warning curve L3 and the turbocompressor normal state.Wherein, the running operating point that moves to through time lag Δ T by A1 for running operating point of A1 '.
Fig. 3 is biased to turbocompressor anti-surge curve L2 by the present invention the schematic representation of L2 ' for turbocompressor running operating point A1 shifts to operating point A1 ' time fast.
Fig. 4 is the flow chart of method of the present invention.
Below in conjunction with accompanying drawing and embodiment practical implementation method of the present invention is given explanation.
Embodiment
As depicted in figs. 1 and 2, design principle of the present invention is following:
We know that conventional turbocompressor anti-surge curve is on the basis of surge curve, to leave certain nargin to obtain, and are the important barriers together that guarantees the turbocompressor safe operation.
Tooling normal operation period, the resistance of processing pipe network slowly change within the specific limits and are controlled.When the processing pipe network resistance slowly raise, turbocompressor 1 exhaust pressure also can be along with slow rising, flow reduce, and running operating point A1 approaches anti-surge curve L2 lentamente.When running operating point A1 reaches or surmount anti-surge curve L2; Surge-proofing controller 2 control anti-surge valves 3 are opened; Increase the rate of discharge of turbocompressor, running operating point A1 gets back to the safe operation zone again, promptly gets back to the zone between anti-surge curve L2 and the warning curve L3.
If tooling runs into the abnormal running state; Cause that the processing pipe network resistance raises fast; Then turbocompressor 1 exhaust pressure also can be along with quick rising, and extraction flow can sharply reduce, and this moment is if use the anti-surge curve L2 of conventional anti-surge curve setting method setting to carry out the turbocompressor Anti-surge Control; Reach or cross turbocompressor surge curve L1 even will make turbocompressor running operating point A1 cross anti-surge curve L2 fast, cause turbocompressor to get into the surge region operation.
In the present invention; The running operating point A1 of 2 pairs of turbocompressors 1 of surge-proofing controller detects in real time and judges; When detecting that running operating point A1 moves and on anti-surge pre-alarm curve L3 fast when anti-surge curve L2 moves; Can know that the turbocompressor exhaust pressure raises fast at this moment, extraction flow sharply reduces; Surge-proofing controller 2 is according to the rate travel Δ V of running operating point A1 to anti-surge curve L2, the anti-surge curve L2 that dynamic bias surge-proofing controller 2 is set, make surge-proofing controller 2 can be in time, in advance, accurately turbocompressor running operating point A1 is made preconditioning control; Be that surge-proofing controller 2 steadily opens it to anti-surge valve 3 transmission OPENs; Increase the rate of discharge of turbocompressor, get into surge region, thereby guarantee the safe operation of turbocompressor and the normal air feed of commercial plant to stop the turbocompressor running operating point.
Like Fig. 3 and shown in Figure 4, the method for turbocompressor anti-surge curve dynamic bias of the present invention specifically comprises the steps:
Step 1: surge curve L1, anti-surge curve L2 and anti-surge early warning curve L3 that turbocompressor is set in surge-proofing controller 2; Wherein, the setting method of surge curve L1, anti-surge curve L2 is known by industry, and non-innovative content of the present invention does not repeat them here; Anti-surge early warning curve L3 is obtained by the certain nargin of the downward translation of anti-surge curve L2, and this nargin coefficient value scope is advisable between 7%～15%;
Step 2: the Δ T that sets interval, Δ T get 200～500 milliseconds;
Step 3: gather operating conditions by surge-proofing controller 2, obtain running operating point A1;
Step 4: collect the interval delta T time behind the running operating point A1, gather operating conditions once more, obtain running operating point A1 ' by surge-proofing controller 2;
Step 5: judging whether running operating point A1 is in the top of anti-surge early warning curve L3, is execution in step 6 then; Otherwise,, return step 4 pair operating conditions then and continue to gather the running operating point A1 of running operating point A1 ' as next cycle criterion;
Step 6: surge-proofing controller 2 judges that according to the relative position of running operating point A1 and running operating point A1 ' whether operating conditions is away from anti-surge curve L2; Be that then the turbocompressor operation is normal,, return step 4 pair operating conditions and continue to gather the running operating point A1 of running operating point A1 ' as next cycle criterion; Otherwise surge-proofing controller 2 utilizes formula 1,2 to calculate running operating point A1 and moves to anti-surge curve L2 needed time T with current motion speed Δ V,
Δ V=S1/ Δ T (formula 1)
T=S/ Δ V=Δ T*S/S1; (formula 2)
Wherein, S is the distance of running operating point A1 apart from the Y direction of anti-surge curve L2, and S1 is the distance of the Y direction between running operating point A1 and the running operating point A1 ', and Δ T is the time lag;
Step 7: time T that surge-proofing controller 2 real-time comparison step 6 obtain and predefined time judgment value T1, T2 (T1 got 10 seconds, and T2 gets and was advisable in 15 seconds); If T＜T1, the current anti-surge curve of anti-surge curve L2 ' replacement that then calculates with formula 3,4 with the running operating point A1 of running operating point A1 ' as next cycle criterion, returns step 4 then; If T＞T2, the current anti-surge curve of anti-surge curve L2 replacement that then is provided with step 1 with the running operating point A1 of running operating point A1 ' as next cycle criterion, returns step 4 then; If T1≤T≤T2, then current anti-surge curve remains unchanged in the surge-proofing controller 2, with the running operating point A1 of running operating point A1 ' as next cycle criterion, returns step 4 then;
L2=f (P, Q) (formula 3)
L2 '=f (P-S/T, Q) (formula 4)
Wherein, Q is an inlet flow rate, and P is an outlet pressure; Δ V is the rate travel of running operating point A1 to anti-surge curve L2; Δ T is the time lag; T moves to anti-surge curve L2 needed time for running operating point A1; L1 is a surge curve; L2, L2 ' are the anti-surge curve.
Claims (3)
1. the method for a turbocompressor anti-surge curve dynamic bias is characterized in that, specifically comprises the steps:
Step 1: surge curve L1, anti-surge curve L2 and anti-surge early warning curve L3 that turbocompressor is set in surge-proofing controller (2); Wherein, anti-surge early warning curve L3 is obtained by the downward translation of anti-surge curve L2;
Step 2: the Δ T that sets interval, Δ T get 200～500 milliseconds;
Step 3: gather operating conditions by surge-proofing controller (2), obtain running operating point A1;
Step 4: collect the interval delta T time behind the running operating point A1, gather operating conditions once more, obtain running operating point A1 ' by surge-proofing controller (2);
Step 5: judge whether running operating point A1 is in the top of anti-surge early warning curve L3, if then execution in step 6; Otherwise,, return step 4 pair operating conditions then and continue to gather the running operating point A1 of running operating point A1 ' as next cycle criterion;
Step 6: surge-proofing controller (2) judges that according to the relative position of running operating point A1 and running operating point A1 ' whether operating conditions is away from anti-surge curve L2; Be that then the turbocompressor operation is normal,, return step 4 pair operating conditions and continue to gather the running operating point A1 of running operating point A1 ' as next cycle criterion; Otherwise surge-proofing controller (2) utilizes formula 1,2 to calculate running operating point A1 and moves to anti-surge curve L2 needed time T with current motion speed Δ V,
Δ V=S1/ Δ T (formula 1)
T=S/ Δ V=Δ T*S/S1; (formula 2)
Wherein, S is the distance of running operating point A1 apart from the Y direction of anti-surge curve L2, and S1 is the distance of the Y direction between running operating point A1 and the running operating point A1 ', and Δ T is the time lag;
Step 7: time T that the real-time comparison step 6 of surge-proofing controller (2) obtains and predefined time judgment value T1, T2; If T＜T1, the current anti-surge curve of anti-surge curve L2 ' replacement that then calculates with formula 3,4 with the running operating point A1 of running operating point A1 ' as next cycle criterion, returns step 4 then; If T＞T2, the current anti-surge curve of anti-surge curve L2 replacement that then is provided with step 1 with the running operating point A1 of running operating point A1 ' as next cycle criterion, returns step 4 then; If T1≤T≤T2, then current anti-surge curve remains unchanged in the surge-proofing controller (2), with the running operating point A1 of running operating point A1 ' as next cycle criterion, returns step 4 then;
L2=f (P, Q) (formula 3)
L2 '=f (P-S/T, Q) (formula 4)
Wherein, Q is an inlet flow rate, and P is an outlet pressure; Δ V is the rate travel of running operating point A1 to anti-surge curve L2; Δ T is the time lag; T moves to anti-surge curve L2 needed time for running operating point A1; L1 is a surge curve; L2, L2 ' are the anti-surge curve.
2. the method for claim 1 is characterized in that, anti-surge early warning curve L3 is 7%～15% by the nargin coefficient of the downward translation of anti-surge curve L2 in the said step 1.
3. the method for claim 1 is characterized in that, the time judgment value T1 in the said step 7 is 10 seconds, and T2 is 15 seconds.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104533820A (en) * | 2014-12-26 | 2015-04-22 | 沈阳鼓风机集团自动控制系统工程有限公司 | Anti surge control method and device |
| CN104763663A (en) * | 2015-02-15 | 2015-07-08 | 杭州和利时自动化有限公司 | Variable working condition operation based compressor operation space determining method and system |
| CN105484874A (en) * | 2015-11-23 | 2016-04-13 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for correcting surging determination coefficient of analog type integrated debugging channel |
| CN105604973A (en) * | 2015-12-18 | 2016-05-25 | 成都成发科能动力工程有限公司 | Whole-line anti-surge control method for axial flow compressor |
| CN106086271A (en) * | 2016-06-20 | 2016-11-09 | 甘肃酒钢集团宏兴钢铁股份有限公司 | For the method reducing the energy efficiency of the blast furnace blower compressed air amount of leaking informaton |
| CN106351835A (en) * | 2016-11-09 | 2017-01-25 | 重庆美的通用制冷设备有限公司 | Compressor control method, compressor control device and electrical equipment |
| CN108131871A (en) * | 2017-12-01 | 2018-06-08 | 重庆美的通用制冷设备有限公司 | The control method of variable frequency centrifuge and hot gas bypass valve therein |
| CN114109860A (en) * | 2021-11-09 | 2022-03-01 | 珠海格力电器股份有限公司 | Air compressor, air compressor control method and device, electronic equipment and storage medium |
| CN114857063A (en) * | 2022-04-13 | 2022-08-05 | 北京康吉森自动化科技有限公司 | Control method for turbine compressor |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104533820A (en) * | 2014-12-26 | 2015-04-22 | 沈阳鼓风机集团自动控制系统工程有限公司 | Anti surge control method and device |
| CN104763663A (en) * | 2015-02-15 | 2015-07-08 | 杭州和利时自动化有限公司 | Variable working condition operation based compressor operation space determining method and system |
| CN104763663B (en) * | 2015-02-15 | 2017-01-04 | 杭州和利时自动化有限公司 | The determination method and system in compressor operating space based on variable parameter operation |
| CN105484874A (en) * | 2015-11-23 | 2016-04-13 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for correcting surging determination coefficient of analog type integrated debugging channel |
| CN105604973A (en) * | 2015-12-18 | 2016-05-25 | 成都成发科能动力工程有限公司 | Whole-line anti-surge control method for axial flow compressor |
| CN106086271A (en) * | 2016-06-20 | 2016-11-09 | 甘肃酒钢集团宏兴钢铁股份有限公司 | For the method reducing the energy efficiency of the blast furnace blower compressed air amount of leaking informaton |
| CN106351835A (en) * | 2016-11-09 | 2017-01-25 | 重庆美的通用制冷设备有限公司 | Compressor control method, compressor control device and electrical equipment |
| CN106351835B (en) * | 2016-11-09 | 2018-07-17 | 重庆美的通用制冷设备有限公司 | A kind of compressor control method, device and electrical equipment |
| CN108131871A (en) * | 2017-12-01 | 2018-06-08 | 重庆美的通用制冷设备有限公司 | The control method of variable frequency centrifuge and hot gas bypass valve therein |
| CN114109860A (en) * | 2021-11-09 | 2022-03-01 | 珠海格力电器股份有限公司 | Air compressor, air compressor control method and device, electronic equipment and storage medium |
| CN114857063A (en) * | 2022-04-13 | 2022-08-05 | 北京康吉森自动化科技有限公司 | Control method for turbine compressor |
| CN114857063B (en) * | 2022-04-13 | 2023-02-10 | 北京康吉森自动化科技有限公司 | Control method for turbine compressor |
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