CN108361219A - A kind of surge in centrifugal compressors control method and device - Google Patents
A kind of surge in centrifugal compressors control method and device Download PDFInfo
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- CN108361219A CN108361219A CN201810019269.2A CN201810019269A CN108361219A CN 108361219 A CN108361219 A CN 108361219A CN 201810019269 A CN201810019269 A CN 201810019269A CN 108361219 A CN108361219 A CN 108361219A
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- surge
- value
- control instruction
- flow rate
- operating point
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/02—Surge control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/02—Surge control
- F04D27/0292—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
Abstract
The embodiment of the present application discloses a kind of surge in centrifugal compressors control method and device, passes through the monitoring data that data acquisition unit obtains centrifugal compressor；According to the monitoring data, determine that operating point measured value (Qi, Hi), wherein Qi are the inlet flow rate value of condition point, Hi is the pressure head value of operating point, i=1,2 ... n；It is determined and the corresponding control instruction of the operating point measured value (Qi, Hi) according to surge criterion；Centrifugal compressor or blow valve are controlled according to the control instruction.By obtaining operating point measured value (Qi, Hi), by each operating point measured value (Qi, Hi surge criterion) is substituted into, is compared with control line array inlet flow rate definite value SP according to operating point inlet flow rate value PV, judges the size of the number j and fixed value F of PV=SP, export corresponding control instruction, control centrifugal compressor or blow valve, it is possible to reduce the probability of surge erroneous judgement improves centrifugal compressor working efficiency.
Description
Technical field
This application involves technical field of automatic control, particularly relate to the surge controlling method of centrifugal compressor
And device.
Background technology
Surge is a kind of inherent characteristic that centrifugal compressor generates in the process of running, is the periodicity of medium in pipeline
Oscillation.Centrifugal compressor generates fluctuating widely for flow, total head and electric current, air-flow occurs past when range of instability is run
Resurgent is dynamic, causes wind turbine and pipeline strong vibration occur, noise significantly increases, to generate surge.Surge is for centrifugal
Compressor has very serious harm, is easily destroyed the flowing law of machine interior media, accelerates the damage of bearing and sealing, very
Destruction is generated to impeller and rotor, influences service life of a machine.Therefore need surge in centrifugal compressors control method to centrifugation
The surge of formula compressor is controlled, and by the way that surge is monitored and controlled, reduces risk.
Traditional surge in centrifugal compressors control method is as shown in Figure 2 using single surge line traffic control：Surge line
It is shown in performance chart reference axis, the real-time operation data in front end is obtained by data acquisition unit, is displayed on monitoring
Each operating point on interface connects into an operating mode line, by operating mode line compared with the position of surge line, judges current centrifugation
The working condition of formula compressor.
Traditional surge in centrifugal compressors control method judgment step is as follows：When operating mode line inlet flow rate process values are more than
When surge line inlet flow rate definite value, it is determined as safety；When operating mode line inlet flow rate process values are greater than or equal to surge line entrance stream
Definite value is measured, centrifugal compressor needs the blow valve by compressor fully open, and unload placing there are surge risk at this time for judgement
Empty valve.Therefore the waste, electric power for also needing to adjust operating mode to cause manpower when load to prevent the generation of surge are re-started
Consumption.According to above-mentioned traditional surge controlling method, erroneous judgement situation is easy tod produce, and then continually that blow valve is fully open,
The waste of manpower and materials is caused, and influences subsequent production process.In summary reason needs to improve traditional surge control
Method reduces erroneous judgement situation and reduces the frequency that blow valve is all vented, improves production efficiency.
Invention content
A kind of surge in centrifugal compressors control method of offer of the embodiment of the present invention and device have solved the prior art and have been easy
Erroneous judgement is generated to continually that blow valve is fully open, the waste of manpower and materials is thereby resulted in, influences subsequent produced
The problem of journey.
In order to solve the above-mentioned technical problem, the embodiment of the invention discloses following technical solutions：
A kind of surge in centrifugal compressors control method, which is characterized in that the method includes：Data acquisition unit obtains
The monitoring data of centrifugal compressor；According to the monitoring data, determine that operating point measured value (Qi, Hi), wherein Qi are condition point
Inlet flow rate value, Hi be operating point pressure head value, i=1,2 ... n；It is determined according to surge criterion and is surveyed with the operating point
The corresponding control instruction of magnitude (Qi, Hi)；Centrifugal compressor or blow valve are controlled according to the control instruction.
Preferably, the surge criterion determination and the corresponding control instruction of the operating point measured value (Qi, Hi), it
Before further include：It obtains surge in centrifugal compressors and data occurs；Surge is generated in a coordinate system using surge curve function (Q, H)
The corresponding surge line of data occurs, wherein the horizontal axis Q of the coordinate system is inlet flow rate, and longitudinal axis H is pressure head value；
Calculate one group of surge line array (Qk, Hk)；According to above-mentioned surge line array (Qk, Hk), Qa=Qk × 105%, Ha=Hk are obtained
To safety line array (Qa, Ha)；According to above-mentioned surge line array (Qk, Hk), Qs=Qk × 110%, Hs=Hk obtains control line
Array (Qs, Hs).
Preferably, described to be determined and the corresponding control of the operating point measured value (Qi, Hi) according to surge criterion
System instructs：
As PV ＞ SP, generation is used to indicate the control instruction that centrifugal compressor works on, and PV refers to that operating mode is clicked and entered
Mouth amount process values, PV=Qi, SP refer to the control line number group inlet flow rate definite value as Hi=Hs；
As AP ＜ PV≤SP, the control instruction for preparing to start operation blow valve is generated, AP refers to safe as Hi=Ha
Line number group inlet flow rate definite value；
As KP ＜ PV≤AP, PV is substituted into anti-erroneous judgement standard and judges to generate corresponding control instruction, KP refers to working as Hi=
Surge line array inlet flow rate definite value when Hk；
As PV≤KP, the control instruction of emptying valve opening 75% is generated.
Preferably, the anti-erroneous judgement standard, first determine current working point previous operating point whether PV ＞ AP, if preceding
One operating point PV ＞ AP then records PV=AP several j of current working point, judges whether j >=F：
As j ＜ F, the control instruction of emptying valve opening 10% is generated；
As j >=F, j-F ＜ 5, Qs=Qs × 101%, Hs=Hs generate new control line array (Qs, Hs)；
As j >=F, j-F >=5, the control instruction of chain parking and the control instruction of alarm are generated.
Preferably, the surge criterion determine with after the corresponding control instruction of the operating point measured value (Qi, Hi)
Further include：When the control instruction includes blow valve opening value, blow valve opening value is substituted into valve step logic；Pass through number
The ice chest and supercharger operational data of current centrifugal compressor are acquired according to collecting unit, obtain blow valve Minimal Protective aperture
Value；A pressure regulator output valve is automatically given by monitoring system；Determine blow valve in surge criterion control instruction
Opening value, pressure regulator output valve and blow valve Minimal Protective opening value；Compare three numerical value, is maximized as putting
Empty valve opening controlling value generates control instruction；When the emptying valve opening output valve is not or not this area of high low clip 5% to 95%
Between when, generate the chain parking of centrifugal compressor control instruction, the control instruction for alarm of being concurrently out of order.
Preferably, further include in the surge criterion processing data procedures：Use control line setting value SP and operating mode
Point entrance flow value PV, calculates control deviation variable SP_PV；100 are subtracted by the control deviation variable SP_PV values to be pacified
Full work show value DEV.
A kind of surge control device of centrifugal compressor, described device include：
Data acquisition unit, the monitoring data for obtaining centrifugal compressor；
Data processing unit generates operating point measured value (Qi, Hi), wherein Qi is operating point for handling monitoring data
Inlet flow rate value, Hi be operating point pressure head value, i=1,2 ... n；
Surge judging unit carries out data processing for substituting into operating point measured value (Qi, Hi) in surge criterion,
Generate control instruction；
Surge control unit, the control instruction for obtaining the transmission of surge judging unit are controlled according to control instruction and are centrifuged
Formula compressor or blow valve.
Preferably, the surge judging unit includes：
Inlet flow rate judging unit, the size for judging the operating point inlet flow rate process values PV and SP, AP, KP,
Output control instruction, operating point inlet flow rate process values PV=Qi, as operating point H axis pressure head numerical value Hi=Hk=Ha=Hs,
It obtains control line array inlet flow rate definite value SP and is equal to Qs, safety line array inlet flow rate definite value AP equal to Qa, surge line array
Inlet flow rate definite value KP is equal to Qk, judges the size of PV and SP, AP, KP, determines centrifugal compressor working condition, root
According to different working conditions, different control instructions is exported；
Trouble free service show value judging unit calculates trouble free service show value DEV for passing through PV and SP, and judges
DEV positive and negative values determine whether centrifugal compressor is in a safe condition；
Valve opening output unit when containing blow valve opening value for control instruction, is determined by step logic and is vented
Valve Minimal Protective opening value compares blow valve opening value, pressure regulator output valve in surge criterion output control instruction
With three numerical value of blow valve Minimal Protective opening value, it is maximized as emptying valve opening controlling value output control blow valve；
Data registration unit judges working condition for obtaining surge criterion, when surge criterion is surge,
It stores centrifugal compressor and operating point measured value (Qi, Hi) when surge occurs.
Preferably, the inlet flow rate judging unit includes：
First entrance flow judging unit is used for inlet flow rate process values PV and control line numerical value group inlet flow rate definite value
SP compares；
Second entrance flow judging unit is used for inlet flow rate process values PV and safety line numerical value group inlet flow rate definite value
AP compares；
Third inlet flow rate judging unit is used for inlet flow rate process values PV and surge line numerical value group inlet flow rate definite value
KP compares.
Preferably, the second entrance flow judging unit includes：
Second entrance flow judgment sub-unit, for comparing PV and AP values, as AP ＜ PV, transmission instruction unpack emptying
Valve；
The first subelement of anti-erroneous judgement, in AP >=PV, as j ＜ T, gives blow valve for comparing PV and AP values
The control instruction of aperture 10%, while recording number j；
The second subelement of anti-erroneous judgement, for comparing PV and AP values, in AP >=PV, as j >=T, T-j ＜ 5, by Qs
=Qs × 101%, Hs=Hs generates new control line array (Qs, Hs)；
Anti- erroneous judgement third subelement is sent out in AP >=PV as j >=T, T-j >=5 for comparing PV and AP values
The control instruction of chain parking and the control instruction of alarm.
As it can be seen that the public range that data display method provided in this embodiment is determined by obtaining the range of each measuring point,
The actual acquisition value of each measuring point is changed into data show value, the coplanar display of multiple measuring points is realized, further realizes data
Show value is clear, accurate display effect, significantly improves the measuring point data bandwagon effect of display terminal.
By above technical scheme as it can be seen that the embodiment of the invention discloses a kind of surge in centrifugal compressors control method and dresses
It sets, the monitoring data of centrifugal compressor is obtained by data acquisition unit；According to the monitoring data, determine that operating point measures
It is worth (Qi, Hi), wherein Qi is the inlet flow rate value of condition point, and Hi is the pressure head value of operating point, i=1,2 ... n；Judged according to surge
Standard determines and the corresponding control instruction of the operating point measured value (Qi, Hi)；Centrifugal pressure is controlled according to the control instruction
Contracting machine or blow valve.As it can be seen that it is provided in this embodiment by obtaining operating point measured value (Qi, Hi), each operating point is measured
Be worth (Qi, Hi) and substitute into surge criterion, according to operating point inlet flow rate value PV and control line array inlet flow rate definite value SP into
Row compares, and judges the size of the number j and fixed value F of PV=SP, exports control instruction, it is possible to reduce the probability of surge erroneous judgement,
Improve centrifugal compressor working efficiency.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, for those of ordinary skill in the art
Speech, without creative efforts, other drawings may also be obtained based on these drawings.
Fig. 1 is centrifugal compressor control display interface schematic diagram provided by the present application；
Fig. 2 is that existing surge in centrifugal compressors control method judges interface schematic diagram；
Fig. 3 is surge in centrifugal compressors control method flow diagram；
Fig. 4 is centrifugal compressor control method surge criterion schematic diagram provided by the present application；
Fig. 5 is that surge in centrifugal compressors criterion control line array provided by the present application judges flow diagram；
Fig. 6 is that surge in centrifugal compressors criterion safety line array provided by the present application judges flow diagram；
Fig. 7 is that surge in centrifugal compressors criterion surge line array provided by the present application judges flow diagram；
Fig. 8 is the positive negative judgement flow diagrams of surge in centrifugal compressors criterion DEV provided by the present application；
Fig. 9 is centrifugal compressor valve step logic flow diagram provided by the present application；
Figure 10 is the schematic diagram of surge in centrifugal compressors control device one embodiment provided by the present application；
Figure 11 is that the surge of surge in centrifugal compressors control device provided by the present application judges single schematic diagram；
Figure 12 is the inlet flow rate judging unit schematic diagram of surge in centrifugal compressors control device provided by the present application；
Figure 13 is the second entrance flow judging unit signal of surge in centrifugal compressors control device provided by the present application
Figure；
Figure 14 is the anti-erroneous judgement cell schematics of surge in centrifugal compressors control device provided by the present application.
Specific implementation mode
In order to make those skilled in the art more fully understand the technical solution in the present invention, below in conjunction with of the invention real
The attached drawing in example is applied, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
The every other embodiment that technical staff is obtained without making creative work, should all belong to protection of the present invention
Range.
In automating generating process, monitoring data is collected by monitoring device data acquisition unit, later
Monitoring data are transferred to controller to handle, eventually by control system by operational data include on monitor terminal, this
Kind automatic control system, it is easy to operate also more intuitive.
Referring to Fig. 1, display interface schematic diagram is controlled for implementation column centrifugal compressor of the present invention.
As shown in Figure 1, in dsp system, monitoring personnel monitors the working condition of centrifugal compressor, passes through air compressor machine surge
Experiment obtains surge and data occurs, and determines the show value of inlet flow rate Q and pressure head H, substitutes into the surge curve function of 7 wave bands
Position of the surge line on (Qi, Hi) is calculated, a surge line is obtained, in a coordinate system using surge curve function (Q, H)
It generates surge and the corresponding surge line of data occurs, wherein the horizontal axis Q of the coordinate system is inlet flow rate, and longitudinal axis H is pressure head value.
One group of surge line array (Qk, Hk) is calculated by surge line；According to above-mentioned surge line array (Qk, Hk), Qa=Qk ×
105%, Ha=Hk obtain safety line array (Qa, Ha), and a safety line is generated in reference axis；According to above-mentioned surge line array
(Qk, Hk), Qs=Qk × 110%, Hs=Hk obtain control line array (Qs, Hs), and a control line is generated in reference axis.Thus
It obtains centrifugal compressor and controls display interface.Monitoring personnel in surge control unit, sets monitor value F, a F=1 simultaneously,
2 ... n, for reducing the risk of the surge erroneous judgement of centrifugal compressor.Arrangement above is completed, then can pass through centrifugal compressor
Surge controlling method controls centrifugal compressor.
Referring to Fig. 3, for an embodiment of the present invention provides a kind of flow diagrams of surge in centrifugal compressors control method.
As shown in figure 3, the embodiment of the present invention has supplied a kind of surge in centrifugal compressors control method, include the following steps：
Step S100, when centrifugal compressor works, acquisition in real time obtains the monitoring data of centrifugal compressor, wherein
Monitoring data include：Centrifugal compressor inlet temperature T1, inlet flow rate process values PV, entrance total pressure P1, outlet stagnation pressure
The switch conditions of strong P2, centrifugal compressor ice chest operating condition and supercharger, the value obtained by data acquisition unit acquisition,
It is transferred to controller.
Step S200 obtains the inlet temperature T1, inlet flow rate process values PV, entrance total pressure of centrifugal compressor
P1, outlet total pressure P2.When calculating centrifugal compressor compressing head H, in order to eliminate influence of the inlet temperature to surge line, it will suck
Temperature considers as one of variable.Using pressure head calculating function will using pressure ratio and inlet temperature as two variables come
Consider：
H：Pressure head, unit：m；T1：Inlet temperature, unit：K；R：Air gas constant, R=29.27, unit：J/(mol
×K)；K：Adiabatic exponent, K=1.4；π：The ratio between outlet stagnation pressure and import stagnation pressure of compressor, π=P2/P1.It is calculated according to pressure head
Machine formula measures the value of pressure head H, this formula avoids inlet temperature from being interfered caused by surge line, can obtain accurately
Surge data.Pressure head Hi, inlet flow rate value PV=Qi are determined by formula, obtain the measured value (Qi, Hi) of operating point, i=1,
2…n.Operating point measured value (Qi, Hi) is shown in the surge detection reference axis (Q, H) of controller display interface, each operating mode
Point, which is connected, obtains performance curve.Monitoring personnel can be judged and surge line, safety line, control by the variation of observation performance curve
The position of line processed understands the working condition of current centrifugal compressor, can make anticipation ahead of time, reduce the generation of surge.
Step S300, the measured value (Qi, Hi) of operating point are obtained as operating point H axis pressure head numerical value Hi=Hk=Ha=Hs
Control line array inlet flow rate definite value SP is obtained equal to Qs, safety line array inlet flow rate definite value AP to enter equal to Qa, surge line array
Mouth flow rate set value KP is equal to Qk.PV is substituted into SP, AP, KP in surge criterion and is judged, is determined by standard centrifugal
Compressor operating situation sends out different control instructions according to different working conditions.
Wherein the specific deterministic process of step S300 as shown in figure 4, Fig. 4 be it is provided in an embodiment of the present invention it is a kind of judge from
The flow diagram of the judgment method of core type compressor surge.
It is Hi that step S310, operating point entrance stream process values PV, which correspond to H axis values, and the corresponding control line arrays of numerical value Hi enter
Mouth flow rate set value SP, PV is compared with SP.
Wherein the specific deterministic process of step S310 is as shown in figure 5, Fig. 5 is surge in centrifugal compressors provided by the invention
Criterion control line array judges flow diagram.
Step S311, judges whether PV is more than SP；
Step S312, when the operating point inlet flow rate process values PV is more than control line array entrance definite value, judgement is at this time
The inlet flow rate of centrifugal compressor is in a safe condition, generates the control instruction of centrifugal compressor normal work.
Step S313 sentences when the operating point inlet flow rate process values PV is less than or equal to control line inlet flow rate value SP
The inlet flow rate value of fixed centrifugal compressor at this time is relatively low, generates the control instruction of blow valve emptying, and further judges to determine
Whether need to use blow valve.
It is Hi that step S320, operating point entrance stream process values PV, which correspond to H axis values, and the corresponding safety line arrays of numerical value Hi enter
Mouth flow rate set value AP, PV is compared with AP.
Wherein the specific deterministic process of step S320 is as shown in fig. 6, Fig. 6 is surge in centrifugal compressors provided by the invention
Criterion safety line array judges flow diagram.
Step S321, judges whether PV is more than AP.
Step S322, the operating point inlet flow rate process values PV are more than safety line array entrance definite value AP, and judgement is at this time
The inlet flow rate of centrifugal compressor is still under safe condition, the control instruction that generation blow valve starts, but blow valve
Work is not run temporarily, is waited for and is further judged to determine the need for given opening value.
When step S323, current working point PV=AP, by judging whether PV is more than AP to previous operating point, if more than then true
Settled preceding operating point is moved from control line to safety line, and number j, j=1,2 ... the n of record current working point PV=AP is obtained
The number j of operating point PV=AP is obtained, j is substituted into analysis standard and generates corresponding control instruction.
Numerical value j is compared by step S324 with the fixed value F of monitoring personnel's default, is judged whether j is less than and is fixed
Value F determines the security situation of centrifugal compressor, reduces the possibility of surge erroneous judgement, and takes precautions against surge in advance.
Step S325 judges centrifugal compressor unit normal operation as j ＜ F, generates the control of emptying valve opening 10%
System instruction, while recording number j.
Step S326 continues to judge whether j-F is less than 5 as j >=F.
Step S327 judges that current unit continues to work normally as j >=F, F-j ＜ 5, generate centrifugal compressor after
The control instruction of continuous work.
Control line is moved to right 1% safety allowance, i.e. Qs=Qs × 101%, Hs=Hs, generates new control by step S328
Line number group (Qs, Hs) can adjust operating point far from safety line, reduce the case where judging by accident in this way.
Step S329 generates the control instruction of the chain parking of centrifugal compressor as j >=F, j-F >=5, and sends out asthma
It shakes the control instruction of alarm.Centrifugal compressor has been over the number that setting may judge by accident at this time, and surge really occurs
Probability increases, and needs to allow centrifugal compressor temporary parking, reduces risk.
It is Hi that step S330, operating point entrance stream process values PV, which correspond to H axis values, and the corresponding surge line arrays of numerical value Hi enter
Mouth flow rate set value KP, PV is compared with KP.
Wherein the specific deterministic process of step S330 is as shown in fig. 7, Fig. 5 is surge in centrifugal compressors provided by the invention
Criterion surge line array judges flow diagram.
Step S331, judges whether PV is more than KP；
Step S332, the operating point inlet flow rate process values PV are more than surge line array entrance definite value KP, and judgement is at this time
Centrifugal compressor inlet flow rate value is relatively low, generates the control instruction of empty valve opening 10%.
Step S333, the operating point inlet flow rate process values PV are less than or equal to safety line inlet flow rate value KP, judgement
Centrifugal compressor inlet flow rate value is low at this time and pressure is excessive, generates the control instruction of emptying valve opening 75%.Pass through increase
Gas in centrifugal compressor is discharged rapidly in emptying valve opening, reduces the pressure inside centrifugal compressor.
Step 340, according to control line setting value SP and operating point inlet flow rate value two variables of PV, control deviation is calculated
Variable SP_PV obtains control deviation variable SP_PV, subtracts 100 by control deviation variable SP_PV values and obtains trouble free service and shows
It is worth (DEV)：
SP_PV=(PV ÷ SP) × 100；
DEV=SP_PV-100；
DEV values are obtained by above formula, judge the positive and negative situation of DEV.
The specific deterministic process of DEV positive and negative values of wherein step S340 is as shown in figure 8, Fig. 8 is provided by the invention centrifugal
The positive negative judgement flow diagrams of compressor surge criterion DEV.
Step S341 judges DEV positive and negative values, reflects whether centrifugal compressor is in trouble free service situation.
Step S342, as DEV ＞ 0, centrifugal compressor is in trouble free service situation at this time for judgement, generates centrifugal compressor
The control instruction of machine normal work.
Step S343, when DEV≤0, operating point is close from asthma surge line at this time for judgement, has the risk there are surge, sends out and carry
Show and takes precautions against the control instruction that surge in centrifugal compressors occurs.
Step S360 determines the working condition of centrifugal compressor by surge criterion, in the control instruction of generation
In when having the control instruction of emptying valve opening, then need to be updated in step logic and continue to judge.Pass through data collector
The ice chest and supercharger working condition of collected current centrifugal compressor pass through in conjunction with system pressure adjuster output valve
Valve step logic judges that output is vented valve opening controlling value.
Wherein the specific deterministic process of step S360 as shown in figure 9, Fig. 9 be it is provided in an embodiment of the present invention it is a kind of judge from
Core type compressor valve controls the flow diagram of step logic judgment method.
Step S361 passes through the ice chest and supercharger of collected current centrifugal compressor in valve step logic first
Working condition is judged, determines blow valve Minimal Protective opening value：
When centrifugal compressor ice chest is closed, the Minimal Protective aperture of blow valve is 75%；
When one section of unloading of supercharger, the Minimal Protective aperture of blow valve is 60%；
When two sections of unloadings of supercharger, the Minimal Protective aperture of blow valve is 45%；
When ice chest and supercharger work normally, blow valve Minimal Protective aperture is to be put in surge criterion control instruction
Empty valve opening value.
Step S362 determines blow valve opening value in surge criterion control instruction, pressure regulator output valve and most
Small protection opening value, the comparison being worth by three obtain maximum value as emptying valve opening controlling value output.
Step S363 judges that being vented valve opening controls output valve whether between blow valve height limit 5% to 95%.
Step S364, when emptying valve opening controls output valve between blow valve height limit 5% to 95%, output is vented
Other instructions of valve control output valve and control instruction are transferred to centrifugal compressor together, and output valve control is controlled according to blow valve
It is vented valve opening.
Step S365, when emptying valve opening controls output valve not in 5% to 95% this section of blow valve height limit
When, and the chain parking toll instruction of centrifugal compressor is sent out, and generate fault alarm control instruction.
Step S370, when judging that the working condition of operating point is surge by surge criterion, when judgement work feelings
When condition is surge, while sending out unit cutoff command, all measured values (Qi, Hi) of operating point before this are recorded.By continuous
Passing surge measurement numerical value is recorded, contributes to monitoring personnel in monitoring process later, according to record data and current work
Condition point measured value compares, in advance generation of the anticipation with the presence or absence of surge.
Step S400, according to the emptying of the control instruction of surge criterion output and emptying valve opening step logic output
Valve opening controlling value includes the aperture and centrifugal compressor of blow valve thus according to work of the instruction control from line compressor
The work of machine.
Referring to Figure 10, for this application provides a kind of surge control device composition frame charts of centrifugal compressor, as Fig. 1
The specific implementation of shown method, as shown in Figure 10, which includes：
Data acquisition unit 51 acquires centrifugal compressor inlet temperature for obtaining centrifugal compressor monitoring data
Value T1, inlet flow rate process values PV, entrance total pressure P1, outlet total pressure P2, centrifugal compressor ice chest operating condition and increasing
The switch conditions of press；
Data processing unit 52, the monitoring data for handling data acquisition unit acquisition, at data processing step
Reason generate operating point measured value (Qi, Hi), wherein Qi be operating point inlet flow rate value, Hi be operating point pressure head value, i=1,
2…n；
Surge judging unit 53 is carried out for substituting into operating point measured value (Qi, Hi) in surge criterion at data
Reason generates control instruction；
Surge control unit 54, for obtain surge judging unit transmission control instruction, according to control instruction control from
Core type compressor or blow valve.
Further, as shown in figure 11, surge judging unit 73 includes：
Inlet flow rate judging unit 61, for judging that the operating point inlet flow rate process values PV and SP, AP, KP's is big
It is small, export control instruction, operating point inlet flow rate process values PV=Qi, as operating point H axis pressure head numerical value Hi=Hk=Ha=Hs
When, it obtains control line array inlet flow rate definite value SP and is equal to Qs, safety line array inlet flow rate definite value AP equal to Qa, surge line number
Group inlet flow rate definite value KP is equal to Qk, judges the size of PV and SP, AP, KP, determines centrifugal compressor working condition,
According to different working conditions, different control instructions is exported；
Trouble free service show value judging unit 62 calculates trouble free service show value DEV for passing through PV and SP, and judges
DEV positive and negative values determine whether centrifugal compressor is in a safe condition；
Valve opening output unit 65, for when control instruction contains blow valve opening value, by blow valve opening value generation
Enter valve step logic, determine surge criterion output control instruction in blow valve opening value, pressure regulator output valve and
Blow valve Minimal Protective opening value compares three numerical value, is maximized as emptying valve opening controlling value output control blow valve；
Data registration unit 64 judges working condition for obtaining surge criterion, when surge criterion is surge
When, operating point measured value (Qi, Hi) when surge occurs for storage centrifugal compressor.
Further, as shown in figure 12, inlet flow rate judging unit 81 includes：
First entrance flow judging unit 71, for determining inlet flow rate process values PV and control line numerical value group inlet flow rate
Value SP compares；
Second entrance flow judging unit 72, for determining inlet flow rate process values PV and safety line numerical value group inlet flow rate
Value AP compares；
Third inlet flow rate judging unit 73, for determining inlet flow rate process values PV and surge line numerical value group inlet flow rate
Value KP compares；
Further, as shown in figure 13, second entrance flow judging unit includes：
Second entrance flow judgment sub-unit 81, for comparing PV and AP values, as AP ＜ PV, transmission instruction unpack emptying
Valve；
Anti- erroneous judgement unit 82, as PV≤AP, starts blow valve for comparing PV and AP values.
Further, as shown in figure 14, anti-erroneous judgement unit 92 includes：
The first subelement 91 of anti-erroneous judgement for as j ＜ T, giving emptying valve opening 10%, while recording number j=j+
1；
The second subelement 92 of anti-erroneous judgement is used to, as j >=T, T-j ＜ 5, determine control line moving to right 1%, adjust operating point
Far from safety line, enough safety allowances are reserved with this,
Anti- erroneous judgement third subelement 93 is used to, as j >=T, T-j >=5, send out chain cutoff command, and sends out surge police
Report.
By above technical scheme as it can be seen that surge in centrifugal compressors control method provided in an embodiment of the present invention and device.
First by acquiring the data of centrifugal compressor, it is updated to the inlet flow rate value to centrifugal compressor in surge criterion
Judge, obtain the working condition of centrifugal compressor, corresponding instruction is exported according to working condition.Secondly in surge criterion
In analysis, reduce and judge by accident and happening in control method, improve the working efficiency of centrifugal compressor.Finally by valve
Door step logic output emptying valve opening output valve, transmission control centrifugal compressor or blow valve together with control instruction.
The above is only the specific implementation mode of the present invention, is made skilled artisans appreciate that or realizing this hair
It is bright.Various modifications to these embodiments will be apparent to one skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest range caused.
Claims (10)
1. a kind of surge in centrifugal compressors control method, which is characterized in that the method includes：
Data acquisition unit obtains the monitoring data of centrifugal compressor；
According to the monitoring data, determine that operating point measured value (Qi, Hi), wherein Qi are the inlet flow rate value of operating point, Hi is
The pressure head value of operating point, i=1,2 ... n；
It is determined and the corresponding control instruction of the operating point measured value (Qi, Hi) according to surge criterion；
Centrifugal compressor or blow valve are controlled according to the control instruction.
2. according to the method described in claim 1, being measured with the operating point it is characterized in that, being determined according to surge criterion
It is worth (Qi, Hi) corresponding control instruction, further includes before：
It obtains surge in centrifugal compressors and data occurs；
It generates surge in a coordinate system using surge curve function (Q, H) and the corresponding surge line of data occurs, wherein the coordinate
The horizontal axis Q of system is inlet flow rate, and longitudinal axis H is pressure head value；
Calculate one group of surge line array (Qk, Hk)；
According to above-mentioned surge line array (Qk, Hk), Qa=Qk × 105%, Ha=Hk obtain safety line array (Qa, Ha)；
According to above-mentioned surge line array (Qk, Hk), Qs=Qk × 110%, Hs=Hk obtain control line array (Qs, Hs).
3. method according to claim 1 or 2, which is characterized in that determined and the work according to surge criterion
The corresponding control instruction of condition point measured value (Qi, Hi) includes：
As PV ＞ SP, generation is used to indicate the control instruction that centrifugal compressor works on, and PV refers to operating point entrance amount
Process values, PV=Qi, SP refer to the control line number group inlet flow rate definite value as Hi=Hs；
As AP ＜ PV≤SP, the control instruction for preparing to start operation blow valve is generated, AP refers to the safe line number as Hi=Ha
Group inlet flow rate definite value；
As KP ＜ PV≤AP, PV is substituted into anti-erroneous judgement standard and judges to generate corresponding control instruction, KP refers to as Hi=Hk
Surge line array inlet flow rate definite value；
As PV≤KP, the control instruction of emptying valve opening 75% is generated.
4. according to the method described in claim 3, it is characterized in that, the anti-erroneous judgement standard, judges the previous of current working point
Whether PV ＞ AP record PV=AP several j of current working point to a operating point if previous operating point PV ＞ AP, and judgement is
No j >=F：
As j ＜ F, the control instruction of emptying valve opening 10% is generated；
As j >=F, j-F ＜ 5, Qs=Qs × 101%, Hs=Hs generate new control line array (Qs, Hs)；
As j >=F, j-F >=5, the control instruction of chain parking and the control instruction of alarm are generated.
5. according to the method described in claim 1, it is characterized in that, the surge criterion determines and operating point measurement
It is worth (Qi, Hi) corresponding control instruction, further includes later：
When the control instruction includes blow valve opening value, blow valve opening value is substituted into valve step logic；
The ice chest and supercharger operational data of current centrifugal compressor are acquired by data acquisition unit, and it is minimum to obtain blow valve
Protect opening value；
A pressure regulator output valve is automatically given by monitoring system；
Compare blow valve opening value, pressure regulator output valve and blow valve Minimal Protective in surge criterion control instruction to open
Angle value is maximized and generates control instruction as emptying valve opening controlling value；
When the emptying valve opening output valve is not or not this section of high low clip 5% to 95%, generates centrifugal compressor and connect
The control instruction of locking vehicle, the control instruction for alarm of being concurrently out of order.
6. according to the method described in claim 1, it is characterized in that, the surge criterion determines and operating point measurement
Being worth (Qi, Hi) corresponding control instruction further includes：
Using control line setting value SP and operating point inlet flow rate value PV, control deviation variable SP_PV is calculated；
100, which are subtracted, by the control deviation variable SP_PV values obtains trouble free service show value DEV.
7. a kind of surge control device of centrifugal compressor, which is characterized in that described device includes：
Data acquisition unit, the monitoring data for obtaining centrifugal compressor；
Data processing unit generates operating point measured value (Qi, Hi), wherein Qi is entering for operating point for handling monitoring data
Mouth flow value, Hi are the pressure head value of operating point, i=1,2 ... n；
Surge judging unit carries out data processing for substituting into operating point measured value (Qi, Hi) in surge criterion, generates
Control instruction；
Surge control unit, the control instruction for obtaining the transmission of surge judging unit control centrifugal pressure according to control instruction
Contracting machine or blow valve.
8. device according to claim 7, which is characterized in that the surge judging unit includes：
Inlet flow rate judging unit, the size for judging the operating point inlet flow rate process values PV and SP, AP, KP, output
Control instruction, operating point inlet flow rate process values PV=Qi are obtained as operating point H axis pressure head numerical value Hi=Hk=Ha=Hs
Control line array inlet flow rate definite value SP is equal to Qs, safety line array inlet flow rate definite value AP and is equal to Qa, surge line array entrance
Flow rate set value KP is equal to Qk, judges the size of PV and SP, AP, KP, centrifugal compressor working condition is determined, according to not
Same working condition, exports different control instructions；
Trouble free service show value judging unit calculates trouble free service show value DEV for passing through PV and SP, and judges DEV just
Negative value determines whether centrifugal compressor is in a safe condition；
Valve opening output unit when containing blow valve opening value for control instruction, determines blow valve most by step logic
Small protection opening value compares blow valve opening value, pressure regulator output valve in surge criterion output control instruction and puts
Empty three numerical value of valve Minimal Protective opening value are maximized as emptying valve opening controlling value output control blow valve；
Data registration unit judges working condition for obtaining surge criterion, when surge criterion is surge, storage
Operating point measured value (Qi, Hi) when surge occurs for centrifugal compressor.
9. device according to claim 8, which is characterized in that the inlet flow rate judging unit includes：
First entrance flow judging unit is used for inlet flow rate process values PV and control line numerical value group inlet flow rate definite value SP ratios
Compared with；
Second entrance flow judging unit is used for inlet flow rate process values PV and safety line numerical value group inlet flow rate definite value AP ratios
Compared with；
Third inlet flow rate judging unit is used for inlet flow rate process values PV and surge line numerical value group inlet flow rate definite value KP ratios
Compared with.
10. device according to claim 9, which is characterized in that the second entrance flow judging unit includes：
Second entrance flow judgment sub-unit, as AP ＜ PV, transmits instruction unpack blow valve for comparing PV and AP values；
The first subelement of anti-erroneous judgement, in AP >=PV, as j ＜ T, gives emptying valve opening for comparing PV and AP values
10% control instruction, while recording number j；
The second subelement of anti-erroneous judgement, for comparing PV and AP values, in AP >=PV, as j >=T, T-j ＜ 5, by Qs=Qs
× 101%, Hs=Hs generate new control line array (Qs, Hs)；
Anti- erroneous judgement third subelement is sent out chain in AP >=PV as j >=T, T-j >=5 for comparing PV and AP values
The control instruction of parking and the control instruction of alarm.
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| CN112902023A (en) * | 2020-12-21 | 2021-06-04 | 重庆江增船舶重工有限公司 | Steam pipeline pressurization system and full-automatic control method thereof |
| CN113944650A (en) * | 2020-07-16 | 2022-01-18 | 麦克维尔空调制冷(武汉)有限公司 | Control method and control device of compressor and heat exchange system |
| CN114383228A (en) * | 2020-10-16 | 2022-04-22 | Lg电子株式会社 | Cooling device system |
| CN114962317A (en) * | 2022-05-14 | 2022-08-30 | 杭州德玛仕气体设备工程有限公司 | Anti-surge control method for tooth type single-stage and multi-stage centrifugal compressors |
| CN117588437A (en) * | 2024-01-18 | 2024-02-23 | 山东豪迈机械制造有限公司 | Anti-asthma compensation method and system for centrifugal compressor |
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| CN114962317B (en) * | 2022-05-14 | 2023-12-19 | 杭州德玛仕气体设备工程有限公司 | Anti-surge control method for tooth type single-stage or multi-stage centrifugal compressor |
| CN117588437A (en) * | 2024-01-18 | 2024-02-23 | 山东豪迈机械制造有限公司 | Anti-asthma compensation method and system for centrifugal compressor |
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