CN101178074A - Pre-judging method for compressor surge - Google Patents
Pre-judging method for compressor surge Download PDFInfo
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- CN101178074A CN101178074A CN 200610144461 CN200610144461A CN101178074A CN 101178074 A CN101178074 A CN 101178074A CN 200610144461 CN200610144461 CN 200610144461 CN 200610144461 A CN200610144461 A CN 200610144461A CN 101178074 A CN101178074 A CN 101178074A
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Abstract
The invention provides a pre-judging method for the surging of a compressor, in particular to a method applied to the refrigeration device of a centrifugal compressor. A group of highest outlet pressure values (p <compoutH>) are firstly obtained by the performance detection of the centrifugal compressor; furthermore, the opening value of the air intake vale (IGV) and the refrigerant flux value (F) of the centrifugal compressor are detected, and the outlet pressure values (p <compout>) are operated by a prearranged formula according to the detected opening value and the refrigerant flux value; after that, the outlet pressure value is compared with the highest outlet pressure value of the opening value of the air intake vale correspondingly detected in the group of the highest outlet pressure values; if the outlet pressure outlet is larger or equal to the highest outlet pressure value, the centrifugal compressor is about to generate surging. Therefore, the invention utilizes the simple steps to pre-judge if the centrifugal compressor is about to generate surging, thus providing a basis for a preparatory surging elimination.
Description
Technical field
The present invention relates to a kind of pre-judging method of compressor surge, more detailed it, the invention provides and a kind ofly be applied to have in the chiller plant of centrifugal compressor, in order to prejudge the pre-judging method that this centrifugal compressor is about to take place the compressor surge of surge.
Background technique
Ice water host computer is the common chiller plant in the central air-conditioning system, and central air-conditioning system system utilizes the transmission via pipeline of frozen water that ice water host computer manufactures, in the mode of heat exchange, reaches the purpose of effective reduction room temperature.In recent years, the use of ice water host computer is more and more universal, and the main running core of ice water host computer ties up to compressor section, with the centrifugal compressor is example, often be accompanied by the generation of surge (Surge) phenomenon in its running, this surging phenomenon is except meeting produces bigger noise, also can make be applied on the drive motor and impeller bearing on stress increase, and then the centrifugal compressor body damaged, therefore, when surging phenomenon continues to occur, for ice water host computer, will certainly cause very big injury.
And for getting rid of surging phenomenon in real time, detect the method for surging phenomenon now, it mostly is measurement by single argument (Single Variable), judge the generation of surging phenomenon, it is only by measuring resulting current value, temperature value or force value, process via signal processing, the foundation of being used as discriminatory analysis respectively, announce the 5th with U. S. Patent, 746, No. 062 patent case is an example, analyze in univariate mode exactly, and with the size of threshold values (Threshold) as judgment standard, and in order to obtain precisely and stable judgment value, shown in the FIG.4 (a) and 4 (b) of this patent case, after it lies in and obtains pressure difference by detective device, be the malfunction of avoiding causing owing to false judgment, must judge flow process via a succession of complicated logic, can analyze judged result, with the generation of the surging phenomenon of confirming centrifugal compressor whether, yet, the operation of this kind detecting mode is real too complicated, relatively, then can expend many time costs, in addition, when this kind detecting mode lies in the surging phenomenon generation, just judge, therefore, if a little time delays is arranged, then might cause the facts of the existing infringement of centrifugal compressor to take place.
Therefore, how to provide a kind of pre-judging method of compressor surge of the problem that can solve above-mentioned known techniques, problem demanding prompt solution in the real field for this reason.
Summary of the invention
In view of the disappearance of above-mentioned known techniques, main purpose of the present invention is to provide a kind of simple and easy pre-judging method that centrifugal compressor is about to take place the compressor surge of surge of prejudging, and gets rid of the foundation of surge so that preparation to be provided.
For realizing above-mentioned main purpose, the pre-judging method of compressor surge of the present invention is that a kind of being applied to has in the chiller plant of centrifugal compressor, and it may further comprise the steps:
(1) by the Performance Detection of this centrifugal compressor, draws one group the highest outlet pressure value (P
CompoutH);
(2) detect air inlet stator (the Inlet Guide Vane of this centrifugal compressor; IGV) opening value and cold medium flux value (F);
(3) according to the opening value of the air inlet stator of being detected and the cold medium flux value draws this centrifugal compressor by following formula (1) computing outlet pressure value (P
Compout);
Z=(P
1X+P
2Y+P
3)
3Formula (1);
Wherein, X, Y and Z be respectively in order to opening value, cold medium flux value and the outlet pressure value of the air inlet stator of representing this centrifugal compressor, P
1, P
2And P
3Be the known coefficient value; And
(4) the highest outlet pressure value of the opening value of the air inlet stator whether detected more than or equal to corresponding step (2) in the highest outlet pressure value of this group of this outlet pressure value relatively, if, confirm that then this centrifugal compressor is about to take place surge, get rid of the foundation of surge so that preparation to be provided.
Compared to known techniques, after the pre-judging method of compressor surge of the present invention mainly lies in the opening value and cold medium flux value of the air inlet stator of detecting this centrifugal compressor, draw the outlet pressure value of this centrifugal compressor by the computing of formula (1), the highest outlet pressure value with the opening value of the corresponding air inlet stator of detecting in one group of outlet pressure value the highest of this outlet pressure value and the Performance Detection gained of this centrifugal compressor compares again, with in this outlet pressure value during more than or equal to this highest outlet pressure value, can prejudge this centrifugal compressor and be about to take place surge, to provide preparation to get rid of the foundation of surge, use the main purpose that reaches above-mentioned.
Description of drawings
Fig. 1 is embodiment's steps flow chart schematic representation of the pre-judging method of compressor surge of the present invention;
Fig. 2 A is performance curve (Performance Curve) schematic representation of the opening value-cold medium flux value-outlet pressure value of the air inlet stator of the centrifugal compressor in the applied chiller plant of the pre-judging method of compressor surge of the present invention;
Fig. 2 B to 2I is the cold medium flux value of opening value of air inlet stator different among the corresponding diagram 2A and the data sheet of outlet pressure value; And
Fig. 3 is the opening value-cold medium flux value-outlet pressure value figure of 3D (three-dimensional) the air inlet stator of simulation drawing 2A.
[primary component symbol description] S10 to S14 step
Embodiment
Below be that the personage who is familiar with this skill can understand other advantage of the present invention and effect easily by the content that this specification disclosed by specific instantiation explanation embodiments of the present invention.The present invention also can be implemented or be used by other different instantiation, and the every details in this specification also can be carried out various modifications and change based on different viewpoints and application under not departing from spirit of the present invention.
See also Fig. 1, it is embodiment's steps flow chart schematic representation of the pre-judging method of compressor surge of the present invention.The pre-judging method system of this compressor surge is applied to have in the chiller plant of centrifugal compressor.In present embodiment, this chiller plant is ice water host computer (chiller), and this chiller plant system can be applicable to central air-conditioning system etc.As shown in the figure, the pre-judging method of this compressor surge is first execution in step S10.
At step S10, be Performance Detection by this centrifugal compressor, draw one group the highest outlet pressure value (P
CompoutH).In present embodiment, this step system carries out the mode of Performance Detection earlier to this centrifugal compressor with reality, (curve of each color is promptly represented a performance curve among the figure after obtaining performance curve (Performance Curve) schematic representation of opening value-cold medium flux value-outlet pressure value of the air inlet stator of this centrifugal compressor shown in Fig. 2 A, what need special instruction is, the quantity of those performance curves is only by being adopted in the present embodiment, be not the quantity that detects the performance curve of back gained in order to the restriction actual performance), can learn the permissible the highest outlet pressure value of the opening value of the air inlet stator that this centrifugal compressor is corresponding different from this performance curve schematic representation.
See also Fig. 2 B to 2I again, be the cold medium flux value of opening value of air inlet stator different among the corresponding diagram 2A and the data sheet of outlet pressure value, as shown in the figure, be to learn that the highest outlet pressure value of this group is respectively to 77640,90840,95920,98660,100300,101200,101900 and 101900 (units f/m of opening value 30% that should the air inlet stator (promptly 0.3), 40% (promptly 0.4), 50% (promptly 0.5), 60% (promptly 0.6), 70% (promptly 0.7), 80% (promptly 0.8), 90% (promptly 0.9) and 100% (promptly 1)
2); Need give annotatedly be, the expression parameter field relevant only in those data sheet with the pre-judging method of compressor surge of the present invention, detecting afterwards in actual performance, the data sheet of gained comprises other parameter field again.Then proceed to step S11.
At step S11, be air inlet stator (the Inlet Guide Vane of this centrifugal compressor of detecting; IGV) opening value and cold medium flux value (F).In present embodiment, this step system in real time or periodically (certain interval of time) carries out the detecting of the opening value of air inlet stator of this centrifugal compressor and cold medium flux value (when specifically implementing, if adopt the opening value of the air inlet stator that periodically carries out this centrifugal compressor and the detecting of cold medium flux value, then can be when detecting at every turn, detect the opening value and the cold medium flux value of the air inlet stator in the set time (for example one minute), and after carrying out the rolling average computing, after drawing the opening value and cold medium flux value of average air inlet stator, the side gives and carries out follow-up step, but is not to exceed with this kind embodiment).Then proceed to step S12.
At step S12, be according to the opening value of the air inlet stator of being detected and the cold medium flux value draws this centrifugal compressor by following formula (1) computing outlet pressure value (P
Compout);
Z=(P
1X+P
2Y+P
3)
3Formula (1);
Wherein, in order to opening value, cold medium flux value and the outlet pressure value of the air inlet stator of representing this centrifugal compressor, P1, P2 and P3 are the known coefficient value respectively for X, Y and Z.In present embodiment, the coefficient value of this formula (1) is opening value, cold medium flux value and the outlet pressure value (shown in 2B to 2I figure) according to the air inlet stator of many group this centrifugal compressors of centrifugal compressor in the performance curve (shown in Fig. 2 A) of Performance Detection gained of this chiller plant, and is obtained by this formula (1) computing.
See also Fig. 3 again, be the opening value-cold medium flux value-outlet pressure value figure of 3D (three-dimensional) the air inlet stator of simulation drawing 2A, stain as shown in the figure can clearlyer be found out opening value, cold medium flux value and outlet pressure value in order to the air inlet stator of many groups of these centrifugal compressors carrying out computing by this formula (1); Need give annotatedly be, the group number of opening value, cold medium flux value and the outlet pressure value of the air inlet stator of many groups of these centrifugal compressors of the stain representative among the opening value-cold medium flux value-outlet pressure value figure of this 3D (three-dimensional) air inlet stator is not restriction to some extent, only the actual example in the present embodiment among the figure, and the number system of group number affects and follow-uply carries out the degree of accuracy of the obtained coefficient value of computing by this formula (1), that is, the group number of obtaining is many more, and it is promptly accurate more to carry out the obtained coefficient value of computing by this formula (1).
And be the calculating process that more offers some clarification on this coefficient value, existing is that example describes with the real data:
This formula (1) (is Z=(P
1X+P
2Y+P
3)
3) to launch the back be Z=P
1 3X
3+ P
2 3Y
3+ 3P
1 2P
2X
2Y+3P
1P
2 2XY
2+ 3P
1 2P
3X
2+ 3P
2 2P
3Y
2+ 6P
1P
2P
3XY+3P
1P
3 2X+3P
2P
3 2Y+P
3 3Totally 10 items, then with the centrifugal compressor of the chiller plant of this Fig. 2 A opening value, cold medium flux value and the outlet pressure value (shown in Fig. 2 B to 2I) through the air inlet stator of many groups of these centrifugal compressors in the performance curve of Performance Detection gained, bringing this formula (1) into (is Z=(P
1X+P
2Y+P
3)
3), solve the coefficient value of 10 items via the computing simultaneous equations, correspond to P respectively
3 3=21836.952; 3P
1P
3 2=3833.9265; 3P
2P
3 2=-7752.849; 3P
1 2P
3=-50.260129; 3P
2 2P3=880.58716; 6P
1P
2P
3=22.58319; P
1 3=0.23413617; P
2 3=-49.355134; 3P
1P
2 2=3.7448195; 3P
1 2P
2=-0.57460569, then more further through computing, get final product P
1=0.616344; P
2=-3.66812; P
3=27.951.
Hold above-mentionedly, can learn that this formula (1) is
Z＝〔0.616344X+(-3.66812)Y+27.951〕
3，
Therefore, under the known situation, can computing draw Z (the i.e. outlet pressure value (P of this centrifugal compressor at X and Y (being the opening value and the cold medium flux value of the air inlet stator of this centrifugal compressor of detecting of step S11)
Compout)).
In addition, in present embodiment, after the outlet pressure value through this formula (1) computing gained in this step is carried out multiplying with a correction factor again, proceed to step S13 again; Wherein, this correction factor is to less than one in 100% (that is 90%≤correction factor＜100%) more than or equal to 90%.
At step S13, be relatively this outlet pressure value whether more than or equal to the highest outlet pressure value of the opening value of the air inlet stator that corresponding step S11 detected in the highest outlet pressure value of this group.In present embodiment.The outlet pressure value that this step system draws institute's computing among the step S12 (by the opening value of the air inlet stator of reality detecting and cold medium flux value by this formula (1) computing person of drawing) and reality are carried out the opening value of the air inlet stator that corresponding step S11 detected in the highest outlet pressure value of this group of mode gained of Performance Detection to this centrifugal compressor the highest outlet pressure value compares, and in this outlet pressure value more than or equal to the highest outlet pressure value of this group in during the highest outlet pressure value of opening value of the air inlet stator that corresponding step S11 detected, confirm that then this centrifugal compressor is about to take place surge, for example, if the opening value of the air inlet stator of being detected by step S11 30% o'clock, the opening value of promptly finding out the air inlet stator from the highest outlet pressure value of this group is that (in present embodiment, opening value is that 30% the highest outlet pressure value is 77640kgf/m to 30% the highest outlet pressure value
2), and relatively whether this outlet pressure value is that 30% the highest outlet pressure value (is 77640kgf/m more than or equal to the opening value of air inlet stator
2), if confirm that then this centrifugal compressor is about to take place surge and proceeds to step S14.
At step S14, output one this centrifugal compressor is about to take place the prompting of surge.In present embodiment, when this step is about to surge takes place in order to judge this centrifugal compressor at step S13, in real time by showing as On Screen Display, cresset or mode such as auditory tone cues is pointed out other people, with the foundation that provides preparation to get rid of surge (for example by closing this air inlet stator and opening hot gas refrigerant bypass valve (Hot-Gas Bypass; HGBP) etc. mode is to get rid of when surge takes place).
In sum, the pre-judging method owner of compressor surge of the present invention will be a Performance Detection of passing through this centrifugal compressor earlier, draw one group of outlet pressure value the highest, and detect the opening value and the cold medium flux value of the air inlet stator of this centrifugal compressor, and opening value and cold medium flux value according to the air inlet stator of being detected are preset the outlet pressure value that formula operation draws this centrifugal compressor by one, again relatively this outlet pressure value whether more than or equal to the highest outlet pressure value of the opening value of the corresponding air inlet stator of being detected in the highest outlet pressure value of this group, if, confirm that then this centrifugal compressor is about to take place surge, changing tool talks about, promptly behind the opening value and cold medium flux value of the air inlet stator of detecting this centrifugal compressor, draw the outlet pressure value of this centrifugal compressor by the computing of formula (1), the highest outlet pressure value with the opening value of the corresponding air inlet stator of detecting in one group of outlet pressure value the highest of this outlet pressure value and the Performance Detection gained of this centrifugal compressor compares again, with in this outlet pressure value during more than or equal to this highest outlet pressure value, can prejudge this centrifugal compressor and be about to take place surge, get rid of the foundation of surge so that preparation to be provided; Compared to known techniques person, the pre-judging method of compressor surge of the present invention does not need to carry out loaded down with trivial details logic determining program, can prejudge this centrifugal compressor and be about to take place surge, that is the present invention system provides a kind of simple and easy pre-judging method of prejudging the compressor surge of surge generation.
The foregoing description is illustrative principle of the present invention and effect thereof only, but not is used to limit the present invention.Any personage who has the knack of this skill all can be under spirit of the present invention and category, and the foregoing description is modified and changed.Therefore, the scope of the present invention should be listed as claim.
Claims (8)
1. the pre-judging method of a compressor surge is applied to have in the chiller plant of centrifugal compressor, and this method comprises the following steps:
(1), draws one group the highest outlet pressure value (P by the Performance Detection of this centrifugal compressor
CompoutH);
(2) detect the opening value and the cold medium flux value (F) of the air inlet stator of this centrifugal compressor;
(3), draw the outlet pressure value (P of this centrifugal compressor again by following formula (1) computing by air inlet guide vane opening value of detecting and cold medium flux value
Compout);
Z=(P
1X+P
2Y+P
3)
3Formula (1);
Wherein, X, Y and Z be respectively in order to opening value, cold medium flux value and the outlet pressure value of the air inlet stator of representing this centrifugal compressor, P
1, P
2And P
3Be the known coefficient value; And
(4) the highest outlet pressure value of the opening value of the air inlet stator whether detected more than or equal to corresponding step (2) in the highest outlet pressure value of this group of this outlet pressure value relatively, if, confirm that then this centrifugal compressor is about to take place surge, get rid of the foundation of surge so that preparation to be provided.
2. the pre-judging method of compressor surge as claimed in claim 1 is characterized in that, this chiller plant is an ice water host computer.
3. the pre-judging method of compressor surge as claimed in claim 1 is characterized in that, this step (2) is to detect in real time or periodically.
4. the pre-judging method of compressor surge as claimed in claim 1, it is characterized in that, the coefficient value of this formula (1) is opening value, cold medium flux value and the outlet pressure value according to the air inlet stator of many group this centrifugal compressors of centrifugal compressor in the performance curve of Performance Detection gained of this chiller plant, and is obtained by this formula (1) computing.
5. the pre-judging method of compressor surge as claimed in claim 1 is characterized in that, after the outlet pressure value through this formula (1) computing gained in this step (3) was carried out multiplying with a correction factor again, the side gave and proceeds to step (4).
6. the pre-judging method of compressor surge as claimed in claim 5 is characterized in that, this correction factor is to less than one in 100% more than or equal to 90%.
7. the pre-judging method of compressor surge as claimed in claim 1, it is characterized in that, this step (4) also this outlet pressure value more than or equal to the highest outlet pressure value of this group in during the highest outlet pressure value of opening value of the air inlet stator detected of corresponding step (2), output one this centrifugal compressor is about to take place the prompting of surge.
8. the pre-judging method of compressor surge as claimed in claim 7 is characterized in that, the mode of this prompting be On Screen Display, cresset show and auditory tone cues one of them.
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