CN107939664A - LNG compressor sets are with pressure to start the system of determining - Google Patents
LNG compressor sets are with pressure to start the system of determining Download PDFInfo
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- CN107939664A CN107939664A CN201711422999.9A CN201711422999A CN107939664A CN 107939664 A CN107939664 A CN 107939664A CN 201711422999 A CN201711422999 A CN 201711422999A CN 107939664 A CN107939664 A CN 107939664A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
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Abstract
The invention discloses a kind of startup with pressure of LNG compressor sets to determine system, is related to compressor design field, and main purpose is that the definite accuracy rate of LNG compressor sets startup with pressure can be improved.The system comprises：Input parameter determining device, inlet flow rate iterative calculation device, inlet pressure iterative calculation device, rotating speed iterative calculation device, performance parameter iterative calculation device, startup determining device, according to startup input data of the LNG compressor sets under with pressure condition, the inlet flow rate at compressor each moment can be iterated to calculate；When inlet flow rate is restrained, the inlet pressure at compressor set each moment is iterated to calculate according to convergent inlet flow rate；When inlet pressure is restrained, the rotating speed at compressor set each moment is iterated to calculate；If rotating speed meets rotating speed, rise requires, and iterates to calculate the system performance parameter at compressor set each moment in rotating speed elevation process；If system performance parameter meets preset condition, it is determined that LNG compressor sets can start under band pressure condition.
Description
Technical field
The present invention relates to Compressor Technology field, starts the system of determining more particularly to a kind of LNG compressor sets are with pressure.
Background technology
In recent years, compressor is widely used in every field, is such as applied in liquefied natural gas (Liquefied
Natural Gas, LNG) device compressor, be known as LNG device refrigerant compressors, referred to as LNG compressors.When LNG compresses
When power-off shutdown occurs for machine, in order to reduce the cryogen amount of releasing, it is necessary to start compressor set, the compressor set under band pressure condition
It can be made of motor, compressor, valve, pipe network, LNG compressor sets inlet pressure is far above LNG compressor sets at this time
Design entry pressure, determines the problem of can LNG compressor sets successfully start under band pressure condition, be one important.
At present, it is main that the startup with pressure of LNG compressor sets is determined using manual type, i.e., determine LNG according to personal experience
Can compressor set smoothly start under band pressure condition, however, the startup with pressure of LNG compressor sets is determined through the above way, it is right
Personal experience is more demanding, and personal experience is horizontal different, therefore, can cause LNG compressor sets are with pressure to start definitive result not
Accurately, so as to cause the definite accuracy rate of LNG compressor sets startup with pressure relatively low.
The content of the invention
In view of this, the present invention provides a kind of startup with pressure of LNG compressor sets and determines system, and main purpose is can be certainly
Can dynamic definite LNG compressor sets start under band pressure condition, improve the definite accuracy rate of LNG compressor sets startup with pressure.
According to one aspect of the invention, there is provided a kind of LNG compressor sets startup with pressure determines system, including：
Input parameter determining device, for determining startup input data of the LNG compressor sets under with pressure condition；
Inlet flow rate iterates to calculate device, for according to the input parameter, iterative calculation compressor each moment into
Mouth flow；
Inlet pressure iterate to calculate device, for when each moment inlet flow rate convergence when, according to it is convergent into
Mouth flow iterates to calculate the inlet pressure at compressor set each moment；
Rotating speed iterates to calculate device, for when the inlet pressure convergence at each moment, iterating to calculate the compression
The rotating speed at unit each moment；
Performance parameter iterates to calculate device, if the rotating speed for each moment meets rotating speed, rise requires, iteration
The system performance parameter at each moment that calculates the compressor set in rotating speed elevation process；
Start determining device, if meeting predetermined system performance condition for the system performance parameter, it is determined that the LNG
Compressor set can start under band pressure condition.
The present invention provides a kind of startup with pressure of LNG compressor sets and determines system, and LNG is determined with current foundation personal experience
Can compressor set smoothly start under band pressure condition compares, and the present invention can determine LNG compressor sets under with pressure condition
Start input data；According to the input parameter, the inlet flow rate at iterative calculation compressor each moment；When described each
During the inlet flow rate convergence at moment, the inlet-pressure at compressor set each moment is iterated to calculate according to convergent inlet flow rate
Power；When the inlet pressure convergence at each moment, the rotating speed at the compressor set each moment is iterated to calculate；It is if described each
The rotating speed at a moment meets rotating speed rise and requires, then each moment that iterates to calculate the compressor set in rotating speed elevation process is
System performance parameter；If the system performance parameter meets predetermined system performance condition, it is determined that the LNG compressor sets are with pressure
It can start under state, can start under band pressure condition so as to automatically determine LNG compressor sets, improve LNG compressors
Group is with pressure to start definite accuracy rate.
Described above is only the general introduction of technical solution of the present invention, in order to better understand the technological means of the present invention,
And can be practiced according to the content of specification, and in order to allow above and other objects of the present invention, feature and advantage can
Become apparent, below especially exemplified by the embodiment of the present invention.
Brief description of the drawings
By read hereafter LNG compressors it is with pressure start calculate detailed description, it is various other the advantages of and benefit for
Those of ordinary skill in the art will be clear understanding.Attached drawing is only used for showing the purpose with pressure for starting and calculating embodiment, and
It is not considered as limitation of the present invention.And in whole attached drawing, identical component is denoted by the same reference numerals.Attached
In figure：
Fig. 1 shows a kind of LNG compressor sets provided in an embodiment of the present invention structural representation with pressure for starting the system of determining
Figure；
Fig. 2 shows the inputting interface of startup input data provided in an embodiment of the present invention；
Fig. 3 shows compressor unit system schematic diagram provided in an embodiment of the present invention；
Fig. 4 shows compressor design point provided in an embodiment of the present invention discharge coefficients at different levels；
Fig. 5 shows a kind of compressor meridian plane static pressure distribution schematic diagram provided in an embodiment of the present invention；
Fig. 6 shows a kind of compressor section B-B static pressure distribution schematic diagram provided in an embodiment of the present invention；
Fig. 7 shows a kind of compressor section B-B Mach Number Distribution schematic diagram provided in an embodiment of the present invention；
Fig. 8 shows a kind of working conditions of compressor point schematic diagram provided in an embodiment of the present invention；
Fig. 9 shows a kind of LNG compressor sets provided in an embodiment of the present invention system block diagram with pressure for starting the system of determining；
Figure 10 shows a kind of LNG compressor sets provided in an embodiment of the present invention interface signal with pressure for starting the system of determining
Figure；
Figure 11 shows that with pressure start of another kind LNG compressor sets provided in an embodiment of the present invention determines method flow diagram.
Embodiment
The exemplary embodiment of the disclosure is more fully described below with reference to accompanying drawings.Although the disclosure is shown in attached drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
Limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
Completely it is communicated to those skilled in the art.
As stated in the Background Art, determine that can LNG compressor sets smoothly start under band pressure condition according to personal experience,
However, the startup with pressure of LNG compressor sets is determined through the above way, it is more demanding to personal experience, and personal experience's level is not
Together, therefore, the LNG compressor sets definitive result with pressure that starts can be caused inaccurate, so as to cause LNG compressor sets are with pressure to start really
Fixed accuracy rate is relatively low.
To solve the above-mentioned problems, an embodiment of the present invention provides a kind of startup with pressure of LNG compressor sets to determine method, this
Inventive embodiments provide a kind of startup with pressure of LNG compressor sets and determine system, as shown in Figure 1, the system comprises：Input ginseng
Number determining device 11, inlet flow rate iterative calculation device 12, inlet pressure iterative calculation device 13, rotating speed iterative calculation device
14th, performance parameter iterative calculation device 15 and startup determining device 16.
The input parameter determining device 11, is determined for startup of the LNG compressor sets under with pressure condition and calculates
Input parameter.The input parameter determining device 11 is that startup meter of the LNG compressor sets under with pressure condition is determined in the system
Calculate the main functional modules of input parameter.
Wherein, the input parameter can include：The stagnation pressure and temperature of compressor unit system, can be used for calculating each
The inlet pressure of a moment compressor；Inlet pressure, temperature, flow and the media components of compressor design, when can be used for each
Carve the step-length of the iterative initial value of compressor inlet flow, inlet flow rate and inlet pressure iteration；Transmission efficiency, the speed of gear-box
Than the transmission efficiency of gear-box can be used for calculating gear-box loss, and speed is than can be used for calculating compressor according to motor speed
Rotating speed；The weight of compressor drum, rotary inertia, the weight of rotor and gear wheel, rotary inertia, the loss of bearing are bent
Line, can be used for the angular acceleration for calculating a certain moment；The characteristic curve of motor, the indicatrix of the motor can be to turn
Speed-power curve or rotating speed-torque curve, can be used for the output power or moment of torsion for calculating motor；It is compressor series, at different levels
Diameter, Stage code name；IGV apertures；Gas temperature, the pressure loss after cooler, can be used for calculating each moment compressor
Performance curve, outlet pressure and pneumatic power；The discharge coefficient curve of each valve, can be used for calculating valve characteristic curve；Pipe
Volume, length, the diameter of net, can be used for calculating pipe system performance curve etc..
It should be noted that input parameter can be what is inputted by setting interface, as shown in Fig. 2, Fig. 2 gives startup
Input data and its corresponding numerical value, set interface can be entered by menu, also can on software flow pattern double click
Left button enters.
The inlet flow rate iterates to calculate device 12, can be used for each according to the input parameter, iterative calculation compressor
The inlet flow rate at a moment.The inlet flow rate iterative calculation device 12 is iterative calculation compressor each moment in the system
The main functional modules of inlet flow rate.
Wherein, the compressor set can include motor, compressor, valve, pipe network, as shown in Figure 3.It is each in iterative calculation
, it is necessary to be related to the performance curve of compressor during the inlet flow rate at a moment, can be calculated by the performance calculating module of compressor
The performance parameter of compressor, is then overlapped each performance parameter to obtain the performance curve of compressor.
Whole unit is in stagnation state during startup with pressure, and compressor inlet outlet pressure differential is smaller, in the level of part there may be
Expansion.The each level of compressor, is matched by design condition progress.By taking certain LNG compressor as an example, 3 grades of flow systems before design point
NumberIn startup with pressure, since rotating speed is relatively low, pressure ratios at different levels are pressed less than design
Than later stages are in blocked-off region.Flow phenomenon in order to better understand, calculating analysis is carried out using CFD.As shown in figure 4, Fig. 4
Give compressor design point discharge coefficients at different levels.
CFD calculating has been carried out to 3 grades of compressors.Although the pressure ratio of complete machine is 1.3, its 3rd level is still in swollen
Swollen state.The ratio between after preceding two-stage, the pressure ratio of gas (with Compressor Inlet Pressure) it is about 1.7, but be down to after 3rd level
1.3.Expansion is in third level inner impeller first half, air-flow is in compressive state in latter half and diffuser；Flowing back
Most of region shows as expanding in device.This shows, even if compressor entirety external characteristics shows as compressive state, wherein indivedual levels
Still it is likely to be at expansion process.Compressor inlet outlet pressure differential is small during startup with pressure, there is expansion, part in the part level of compressor
It is compression process in level.And in the level expanded, be not simple expansion process yet, be alternately present in the level expansion-
Compression-expansion process, as shown in Figure 5-Figure 7, Fig. 5 is meridian plane static pressure distribution, and Fig. 6 is section B-B static pressure distribution, Fig. 7 B-B
Section Mach Number Distribution.Due to compressor performance computation model, for the calculating process of iteration step by step.Level performance essence is by repeatedly
For temperature polytropic exponent mT, volume polytropic exponent mvTo calculate outlet pressure and temperature.During for there is swelling state in level, by
0 is may be close in efficiency value or be negative value, mvNon-physical solution is likely to occur, existing algorithm becomes unstable/diverging.For this
Kind situation, is improved computation model, is allowed to that compression and the process with expansion can be calculated at the same time.
In addition, startup with pressure is the dynamic process of a system, not only the characteristic with compressor in itself is related, and also and motor
Characteristic, system-head curve, valve losses characteristic are closely related, import of the embodiment of the present invention at iterative calculation compressor each moment
When flow, inlet pressure, rotating speed, motor, compressor, valve, system-head curve are considered, i.e., be for whole in iterative calculation
The iteration of a system.
The inlet pressure iterates to calculate device 13, can be used for when the inlet flow rate convergence at each moment, root
The inlet pressure at compressor set each moment is iterated to calculate according to convergent inlet flow rate.The inlet pressure iterative calculation dress
It is to iterate to calculate the main of the inlet pressure at compressor set each moment according to convergent inlet flow rate in the system to put 13
Function module.
It should be noted that since the inlet pressure of each moment compressor is unknown, it is therefore desirable to iterate to calculate.Compression
Machine set system not only meets quality and the conservation of energy, also needs to consider that time term influences.After rotating speed rise, to pressure and flow effect
The regular hour is needed to complete to transmit.Influence compressor inlet pressure and be stranded element, mainly there are two：When pressure oscillation transmission, two
It is that inlet pressure caused by mass transfer changes.Defined according to velocity of sound, pressure oscillation transmission speed, be gas velocity of sound；And quality passes
Caused pressure change is passed, it is related to air velocity in pipe network system.Two factors are calculated respectively during calculating, to determine to restrict
Factor.
The rotating speed iterates to calculate device 14, can be used for when the inlet pressure convergence at each moment, iteration meter
Calculate the rotating speed at the compressor set each moment.The rotating speed iterative calculation device 14 is that the compression is iterated to calculate in the system
The main functional modules of the rotating speed at unit each moment.
In embodiments of the present invention, the rotating speed of the compressor set at a time can according to the motor at the moment it is defeated
Go out power Pmotor, compressor pneumatic power Pcomp, mechanical loss power Plose, rotor-support-foundation system moment of torsion M, the rotation of rotor-support-foundation system
Inertia J iterative calculation.
The performance parameter iterates to calculate device 15, if the rotating speed that can be used for each moment meets rotating speed, rise will
Ask, then the system performance parameter at each moment that iterates to calculate the compressor set in rotating speed elevation process.The performance parameter changes
It is that the system performance at each moment that the compressor set iterated to calculate in the system in rotating speed elevation process is joined for computing device 15
Several main functional modules.
Wherein, the system performance parameter can include the driving acc power at each moment, the maximum of each moment compressor goes out
Distance apart from anti-surge line of mouthful pressure, each moment working conditions of compressor point, each required torque of moment compressor, in above-mentioned system
When system performance parameter is satisfied by its corresponding condition, determine that the LNG compressor sets can start under band pressure condition, otherwise,
Then can be by adjusting startup time of the LNG compressor sets under with pressure condition, or specified rotating speed, to realize that the LNG is pressed
Contracting unit starts under band pressure condition.
The startup determining device 16, if can be used for the system performance parameter meets predetermined system performance condition,
Determine that the LNG compressor sets can start under band pressure condition.The startup determining device 16 is definite described in the system
The main functional modules that LNG compressor sets can start under with pressure condition.
Start the time it should be noted that can pre-set, determine that can LNG compressor sets start under band pressure condition
During, it is necessary to pre-set start the time each moment be iterated, the iterative process at each moment includes
Three stacking generations：Internal layer iteration, middle level iteration, external iteration, the process of internal layer iteration are to iterate to calculate the compressor at the moment
Inlet flow rate, the tolerance for iterating to calculate inlet flow rate can be pre-set, terminate iteration when inlet flow rate is restrained
Calculate；Middle level iteration is to iterate to calculate the Compressor Inlet Pressure at the moment, and iterating to calculate the tolerance of inlet pressure can be
It is pre-set, terminate to iterate to calculate when inlet pressure is restrained；External iteration is to iterate to calculate the compression at the moment
The rotating speed of machine, the tolerance for iterating to calculate rotating speed can be pre-set, when rotating speed reaches the specified rotating speed at the moment, terminate
Iterative calculation.At the end of the three stackings generation at the moment, the three stacking generations at next moment are entered back into, are opened until pre-set
After the completion of all iteration of each moment of dynamic time, stop calculating.In addition, the convergence inlet flow that sometime internal layer iterates to calculate
Amount, can be the input parameter of middle level iteration, and the convergence inlet pressure of the moment middle level iterative calculation, can be used as the next moment
The input of iterative calculation.
In embodiments of the present invention, LNG compressor sets with pressure start needs largely to iterate to calculate in determination process, in order to make
User interface can quickly respond operation, improve that software is overall to perform speed, multithreading can be used, occupying length
The calculating task of time is put into separate threads processing.
Thread is that single continuous control stream, a program can have multiple threads concurrently performed in a process.This
The memory and resource that a little thread shared routings take.Write the coordination that multithread programs main difficulty is data between different threads.
VC++ creates a thread and uses AfxBeginThread () function, its prototype is：
CWinThred*AfxBeginThread(
AFX_THREADPROC pfnThreadProc,
LPVOID pParam,
IntnPriority=THREAD_PRIORITY_NORMAL,
UINT nStackSize=0,
DWORD dwCreateFlags=0,
LPSECURITY_ATTRIBUTES lpSecurityAttrs=NULL)；
Parameter pfnThreadProc represents a pointer for being directed toward the control function for being tied to thread.Thread will after starting
Into this control function.By specifying different functions that thread can be made to perform different functions.Parameter pParam be used for
Control function Transfer Parameters, if parameter is not required, are passed to NULL；If necessary to multiple parameters, these parameters should be encapsulated
PParam is transmitted into structure, and by the pointer of structure.Computational threads in startup software with pressure, just belong to need to transmit it is multiple
Parameter situation.Usual AfxBeginThread need to only set the first two parameter, behind use default value.
One thread is likely to be at operating status in life cycle, can also be placed in a suspend state.Pass through
CWndThread class SuspendThread and ResumeThread functions can respectively suspend, recover thread execution.Thread is held
Row cannot be carried out arbitrarily, it is necessary to be subject to Synchronization Control.Controlled in this software development using semaphore.
A kind of LNG compressor sets provided in an embodiment of the present invention are with pressure to start the system of determining, with current according to personal experience
Compared to determine that can LNG compressor sets smoothly start under band pressure condition, the embodiment of the present invention can determine LNG compressor sets
Startup input data under with pressure condition；According to the input parameter, the import at compressor each moment is iterated to calculate
Flow；When the inlet flow rate convergence at each moment, it is each that the compressor set is iterated to calculate according to convergent inlet flow rate
The inlet pressure at a moment；When the inlet pressure convergence at each moment, the compressor set each moment is iterated to calculate
Rotating speed；If the rotating speed at each moment meets rotating speed, rise requires, and iterates to calculate the compressor set and is raised in rotating speed
During each moment system performance parameter；If the system performance parameter meets predetermined system performance condition, it is determined that described
Can LNG compressor sets can start under band pressure condition, be opened under band pressure condition so as to automatically determine LNG compressor sets
It is dynamic, improve the definite accuracy rate of LNG compressor sets startup with pressure.
Further, in order to iterate to calculate the inlet flow rate at compressor each moment, namely internal layer iterative calculation, institute are carried out
Inlet flow rate iterative calculation device 12 is stated, specifically can be used for according to the inlet pressure of input, inlet temperature and specified rotating speed, meter
The performance curve of the compressor at each moment is calculated, valve performance curve is calculated according to the valve flow coefficient curve of input, according to
Pipe network volume, length and the diameter of input, calculate pipe network performance curve；
First, when calculating the performance curve of compressor, the process of compression and expansion can be calculated at the same time, i.e., compression and and
Expand the performance parameter that compressor is calculated under two states, calculate compressor performance parameter essence at different levels can according to temperature it is more
Variable parameter mT, volume polytropic exponent mvTo calculate the outlet pressure of compressor and outlet temperature.Involved calculation formula：
Wherein K, X, Y are calculated by Constitute equation.K is specific heat ratio, and X and Y are compressibility function.
When certain level-one, there are during compressive state, calculate the outlet pressure of compressor and the process of outlet temperature is：
(1) the compressibility factor Z, gas constant R, specific heat ratio K of import are calculated according to Constitute equation, it is compressibility function X, Y, close
Spend ρ；
(2) according to specified rotating speed n, impeller diameter D2, calculate discharge coefficientWith machine Mach number Mu2；
(3), according to discharge coefficientWith Mach number Mu2Input work factor τ and polytropic efficiency η is calculated with interpolation algorithmp, and
Consider dimensional effect amendment；
(4), start iteration outlet pressure, calculate the m of importvAnd mTAs initial value, pressure ratio ε, outlet temperature are calculated, is gone out
Mouth pressure：
p2=p1ε
(5) m of outlet is calculatedvAnd mT, and according to outlet mvAnd mTRecalculate average mvAnd mT, return to previous step again
Calculate outlet pressure and temperature.Until the difference of the front and rear outlet pressure calculated twice is sufficiently small, then convergence is calculated.
(6) using the outlet pressure calculated, temperature as final outlet pressure and temperature.
When certain level-one, there are during swelling state, calculate the outlet pressure of compressor and the process of outlet temperature is：
1st, according to discharge coefficientWith Mach number Mu2Input work factor τ and polytropic efficiency η is calculated with interpolation algorithmp, and examine
Consider dimensional effect amendment；
2nd, the gross energy head h of level is calculatedtot, and calculate import physical parameter；
The physical parameter of import, is calculated using Constitute equation module.It can be counted according to the pressure, temperature and component of input
Calculate the physical parameter of import.
3rd, import physical parameter is taken to be averaged as level the initial value of physical parameter；
4th, the pressure and temperature of level outlet is calculated according to the following equation；
Wherein, p1For level inlet pressure, p2For level outlet pressure, T1For level inlet temperature, T2For level outlet temperature, K be than
Hot ratio, τ are to input work factor, Mu2For machine Mach number, ηpFor level polytropic efficiency.
5th, the physical parameter that level exports and level is average is calculated.Return to step 4 recalculates, until it is front and rear calculate twice go out
Mouth pressure is constant (being less than specified threshold)；This grade of iteration terminates, and is transferred to next stage calculating.
The outlet pressure and outlet temperature of completion compressor are being calculated, the performances at different levels ginseng of compressor can be calculated successively
Number, completes overall performance parameter and calculates, and is exported in the form of report calculated.
2nd, the process of valve performance curve is calculated according to each valve flow coefficient curve of input to be：
When gas passes through valve, the discharge coefficient calculation formula of valve is：
Wherein, Cv- valve flow coefficient；
QN- standard state volume flow；
Y-the coefficient of expansion；
X-pressure difference ratio；
p1- upstream pressure；
M-medium molecule amount；
Z-media collapse the factor；
XT- critical pressure differential ratio；
FK- specific heat ratio coefficient FK=k/1.4；
The flowing of compressible medium has obstruction stream and non-obstruction to flow.Valve flow coefficient calculation formula becomes in the blocking state may
For：
When the discharge coefficient of given valve, according to above-mentioned formula, different Q can be calculatedNWhen pressure difference than X, according to X
With valve pressure p1, different flow Q can be calculatedNWhen downstream pressure p2.It is blocked state to calculate always to valve.Each stream
Amount point and corresponding valve crushing, you can to obtain valve performance curve.
3rd, according to pipe network volume, length and the diameter of input, the process for calculating pipe network performance curve is：
Wherein：
G-mass velocity；
λ-friction factor；
L-pipe range；
D-tubing internal diameter；
The reynolds number Re and tube wall relative roughness of friction factor λ and Bottomhole pressure mediumIt is related.
According to equation and above-mentioned friction factor relation, the gas pressure after pipe network can be obtained.Gas is by pipe network
Front and rear total enthalpy conservation, can calculate exit flow temperature accordingly.Taking different flow values, (desirable compressor is maximum, minimum stream
The several points being distributed between amount) calculate respectively, it can obtain pipe system performance curve.
The maximum stream flow and the average value of minimum discharge determined according to the performance curve of the compressor, primarily determines that import
Flow；Wherein, the both ends flow of the performance curve of the compressor is maximum stream flow QmmaxWith minimum discharge Qmmin, it is preliminary true
Fixed inlet flow rate Qm=0.5* (Qmmax+Qmmin)。
According to physical property characteristic parameter in the inlet flow rate and gas component and presetting database, the inlet flow rate is calculated
The outlet pressure of corresponding compressor；It should be noted that the mode for calculating outlet pressure may be referred to it is above-mentioned involved
Computational methods.
The inlet flow is calculated according to the inlet flow rate, the valve performance curve and the pipe network performance curve respectively
Measure corresponding valve crushing and pipeline crushing；
According to the difference of the outlet pressure of the corresponding compressor of the inlet flow rate and the inlet pressure of input, primarily determine that
Compressor pressure rises；
If primarily determine that compressor pressure rise be more than the valve crushing and the pipeline crushing, will primarily determine that into
Mouth flow is determined as minimum discharge；If the compressor pressure primarily determined that, which rises, is less than the valve crushing and the pipeline crushing,
The inlet flow rate primarily determined that is determined as maximum stream flow；For example, if the compressor pressure primarily determined that rises and is more than the valve pressure
Damage and the pipeline crushing, then by Q at this timemAssign minimum discharge Qmmin, otherwise by Q at this timemAssign maximum stream flow Qmmax。
Then according to above-mentioned definite QmFormula redefines Qm。
According to the maximum stream flow or minimum discharge redefined, inlet flow rate is redefined, and determine new inlet flow
Outlet pressure, valve crushing and the pipeline crushing of the lower compressor of amount；
According to new outlet pressure and the inlet pressure of input, determine that new compressor pressure rises, until new compressor pressure
Rise and the difference of new valve crushing and new pipeline crushing is less than the first specified tolerance, determine that the inlet flow rate of the compressor is received
Hold back.For example, first specified tolerance can be 0.0001BAR, 0.0002BAR etc..
The inlet pressure iterates to calculate device 13, specifically can be used for according to each moment and each moment
Corresponding convergent inlet flow rate, determines the change curve that compressor inlet flow changes over time；
Determine total gaseous mass M in pipe network when the compressor set is not actuated0With pipe network volume V0.It should be noted that
Pipe network volume V0, as known parameter, can calculate and be inputted before starting by user.The stagnation pressure of gas is also in system
Know.Density can be so calculated by Constitute equation, and then calculates gaseous mass M total in system0。
Is calculated by pipe network and flows into flow m into row interpolation for the change curve according to each moment1tFlow is flowed out with pipe network
m2t。
According to it is described not actuated when pipe network in total gaseous mass M0, the pipe network volume V0, the pipe network flow into flow
m1tWith pipe network outflow flow m2t, iterate to calculate the inlet pressure p at the compressor set each momentt。
Specifically, can be calculated by equation below：
In above formula, pipe network flows into flow m1tWith outflow flow m2tBe the function of time, calculated in iterative process
Amount, but an initial value is needed, initial value is estimated automatically by program.Initial value does not influence result of calculation, but initial value
Estimation it is accurate, then program fast convergence rate some.If rotating speed stops enough for a long time at certain moment, system is up to flat
Weighing apparatus state, inlet and outlet flow m1tAnd m2tIt is equal；Otherwise they have a difference.
Refer to if the difference of the inlet pressure at compressor set each moment and the inlet pressure of last iteration is less than second
Constant volume is poor, it is determined that the inlet pressure convergence at compressor set each moment, when convergent inlet pressure is used to be used as current
The inlet pressure initial value of the subsequent time input at quarter.For example, the second specified tolerance can be 0.0001BAR, 0.0002BAR etc..
The rotating speed iterates to calculate device 14, specifically can be used for the specified rotating speed at each moment according to input, to defeated
The motor characteristic curve entered carries out interpolation processing, calculates the specified output power of motor P at each momentmotor.Wherein, the motor
Indicatrix can be speed power curve.
According to compressor series n, the inlet flow rate at different levels of inputWith gas physical parameter, the pressure at each moment is calculated
Contracting machine pneumatic power Pcomp。
Wherein, gas physical parameter can include the h2iOutlet enthalpies at different levels, hi1Import enthalpies at different levels, disengaging at different levels
Mouth enthalpy can be obtained by physical property module according to pressure, temperature and gas calculation.
According to the specified rotating speed at each moment and default mechanical loss table, the mechanical loss at interpolation calculation each moment
Power Plose。
The mechanical loss of meeting given design rotating speed in input parameter, and give relation curve of the loss with rotating speed.So
In iteration, mechanical loss power can quickly be calculated according to tachometer value.
According to the specified rotating speed n at each moment, calculate and specify rotor velocity ωt.It can specifically use following public
Formula calculates：
According to the specified output power of motor P at each momentmotor, each moment compressor pneumatic power Pcomp、
The specified mechanical loss power P at each momentlose, the specified rotor velocity ωt, rotor moment of inertia J, calculate rotor
Angular acceleration β.Specifically, calculated by equation below：
Δ P=Pmotor-Pcomp-Plose
Δ P=M ωt
M=J β
Time integral is carried out to the angular acceleration.Specifically, calculated by equation below：
By the specified rotor velocity ωtThe rotor velocity obtained with integral and calculatingBe compared, and according to than
Relatively result adjusts the specified rotating speed at each moment, and recalculates and compare, until the rotating speed at each moment is restrained.Need
It is bright, when iterating to calculate rotating speed sometime, it is necessary to which the front and rear rotating speed variance iterated to calculate twice is less than specified tolerance,
For example, specified tolerance is 0.1rpm, the calculating convergence at the moment is determined.After the completion of the rotating speed at the moment, then it is transferred to lower a period of time
The rotating speed iterative calculation at quarter.
For the embodiment of the present invention, the system performance parameter includes driving acc power, each moment compressor at each moment
Distance apart from anti-surge line of maximum outlet pressure, each moment working conditions of compressor point, each required torque of moment compressor.
The performance parameter iterates to calculate device 25, specifically can be used for the rotating speed using each moment to input
Driving machine indicatrix carries out interpolation processing, calculates the driving acc power at each moment；According to the gas component of input and in advance
If the gas physical property characteristic parameter in database, compressor import enthalpy at different levels and outlet enthalpy are calculated；According to described
Convergent inlet flow rate, the import enthalpy and the outlet enthalpy, calculate the power that the compressor is consumed；
After the compressor series of input, diameter at different levels, Stage code name, suction port of compressor valve opening, cooler
Gas temperature, the pressure loss, iterate to calculate the maximum outlet pressure of each moment compressor and the property of each moment compressor
Can curve；Need above to have elaborated the mode for the outlet pressure for calculating compressor, herein without repeating.Opened with pressure
In dynamic calculating, each moment compressor outlet maximum pressure is monitored.If it exceeds specified threshold, then can send early warning letter
Breath.
Valve performance curve is calculated according to each valve flow coefficient curve of input；According to the pipe network volume of input, length
With diameter calculation pipe network performance curve；Anti-surge is determined according to each pumping point on the performance curve of each moment compressor
Line；The crosspoint of the valve performance curve and the pipe network performance curve is determined as the working conditions of compressor point；According to institute
State position of the working conditions of compressor point on the performance curve, determine each moment working conditions of compressor point apart from anti-surge line away from
From；The performance curve of compressor, valve performance curve, pipe network performance curve calculation with above involved in calculation
It is identical, herein without repeating.Anti-surge line is determined according to each pumping point on the performance curve of each moment compressor,
Specifically, anti-surge line is the curve that considers certain safe clearance and generate on the basis of surge line, namely according to described
Each pumping point on the performance curve of each moment compressor determines surge line, then on the basis of surge line, considers certain
Safe clearance generation anti-surge line.The crosspoint of the valve performance curve and the pipe network performance curve is determined as described
Working conditions of compressor point, as shown in figure 8, the position according to the working conditions of compressor point on the performance curve, determines each moment
Distance of the working conditions of compressor point apart from anti-surge line.This distance, refers to current centrifugal compressor discharge coefficient and pumping point
The relative value of discharge coefficient difference, it is desirable to more than 0, be typically based on the value that security concern takes and want>5%.Its expression formula can table
It is shown as：
In startup with pressure calculates, each each section of curve of moment compressor is monitored, if operating point is apart from anti-surge line
Cross closely, prompt message can be sent.
Interpolation processing is carried out to the motor characteristic curve of input using the rotating speed at each moment, calculates each moment
Output power of motor；According to compressor series, mass flow and the gas component of input, the compressor for calculating each moment is pneumatic
Power (has been described above, herein without repeating)；According to the rotating speed at each moment and default mechanical loss table, interpolation meter
Calculate the mechanical loss power at each moment；The angular speed at each moment is calculated using the rotating speed at each moment；According to described
The output power of motor at each moment, the compressor pneumatic power at each moment, the mechanical loss work at each moment
Rate and the angular speed at each moment, determine each required torque of moment compressor.Specifically, equation below can be passed through
Calculate, determine each required torque of moment compressor：
Δ P=Pmotor-Pcomp-Plose
Δ P=M ω
In another alternative embodiment of the present invention, in order to specifically determine the LNG compressor sets under band pressure condition
It can start, the startup determining device 16, if the driving acc power that specifically can be used for each moment is more than the compression
Power that machine is consumed, the maximum outlet pressure of each moment compressor be less than default outlet pressure threshold value, it is described each when
Carve working conditions of compressor point and be more than pre-determined distance threshold value and required turn of each moment compressor apart from the distance of anti-surge line
Square is less than the torque that driving machine is sent, it is determined that the LNG compressor sets can start under band pressure condition.
It should be noted that it is more than default outlet pressure threshold in the maximum outlet pressure for determining each moment compressor
During value, warning information can be sent, is determining that it is default that distance of each moment working conditions of compressor point apart from anti-surge line is more than
During distance threshold, prompt message can also be sent, by sending warning information and prompt message, can make it that technical staff is timely
Know the property abnormality situation of compressor.
Further, the system also includes：Judgment means.
The judgment means, can be used for judging whether the compressor angular acceleration at each moment is more than 0；If so,
Then determine that the rotating speed at each moment meets rotating speed rise and requires；If it is not, when then increasing the startup of the LNG compressor sets
Between.
The LNG compressor sets of the embodiment of the present invention are with pressure to start the system of determining, can be with as shown in figure 9, the system can
To be made of boundary layer, computation layer, data Layer.Boundary layer mainly includes the modules such as main interface, each unit interface, helping prompt；
Computation layer is the core of software, including physical property module, data interpolating, unit module calculate, system iterates to calculate etc.；Data Layer is born
Duty preserves, management result of calculation.A large amount of submodules are included under each module again；Data access layer is connected by database, accessed
Module forms.The interface schematic diagram of wherein described system can be as shown in Figure 10.
In order to be better understood from the embodiment of the present invention, following application scenarios are additionally provided, as shown in figure 11,
1st, input parameter is checked；
2nd, the motor characteristic at a certain moment is calculated；At the time of i.e. according to input, motor speed value is calculated, then according to electricity
What the indicatrix of machine was obtained into row interpolation.
3rd, pressure initial value is calculated；The pressure initial value refers to the initial pressure value of each moment suction port of compressor.
4th, flow initial value is calculated；The initial value of flow be according to compressor design flow estimation, i.e., according to design into
What the rotating speed of mouth flow, the rotating speed at the moment and compressor design calculated.
5th, compressor, cooler, valve, pipe network loss property are iterated to calculate；Specifically, gas is calculated after valve
Gas pressure after the pressure before valve, valve losses, cooler of pressure, corresponding pipeline crushing, gas, pipeline pressure
Power.
6th, judge whether flow restrains；If not restraining, step 4 is jumped back to；If convergence, jumps to step 7；Former and later two
The difference of the mass flow of sub- iteration step, less than the tolerance specified, such as 0.002kg/s, it is believed that flow is restrained.
7th, system transfer characteristic calculates；System not only meets quality and the conservation of energy, also needs to consider that time term influences.Rotating speed
After rise, the regular hour is needed to complete to transmit to pressure and flow effect.Influence compressor inlet pressure and be stranded element, mainly there is two
It is a：When pressure oscillation transmission, second, inlet pressure caused by mass transfer changes.Defined according to velocity of sound, pressure oscillation transmission speed,
It is gas velocity of sound；And pressure change caused by mass transfer, it is related to air velocity in pipe network system.Therefore, it is necessary to consider
System transfer characteristic.
8th, judge whether Compressor Inlet Pressure restrains；If not restraining, step 4 is jumped back to；If convergence, jumps to step
9；The difference for the inlet pressure that former and later two sub- iteration steps calculate is less than the pressure tolerance specified, it is believed that inlet pressure is restrained.
9th, rotor-support-foundation system raising speed calculates；The tachometer value given by t moment, calculates the angular velocity omega specifiedt；Calculate rotor system
The moment of torsion M of system, and calculate rotor angular acceleration β；By angular acceleration β to time integral, rotor velocity is obtainedIt will calculate
Angular speedWith ωtCompare, and adjust the specified rotating speed of t moment.
10th, judge whether the time value at the moment meets that rotating speed rise requires；If if satisfied, then jump to step 11, not
Meet, then jump to step 12；According to the tachometer value of integral and calculating, initially compared with each moment rotating speed.If integration obtains
Tachometer value be less than default each moment tachometer value, then need adjustment time value.
11st, prompt message/need duration is exported；
12nd, judge whether each moment calculates completion；If not completing, step 2 is jumped to；If completing, step 13 is performed；
13rd, start and judge to calculate；Specifically, have and start judgment rule：(1) power that each moment driving machine is sent, greatly
In the power that compressor is consumed；(2) maximum pressure at each moment is less than the threshold values limited；(3) each moment working conditions of compressor point
Have from surge line with a distance from enough；(4) each required torque of moment compressor is less than the torque that driving machine is sent；
14th, result of calculation exports.
The embodiment of the present invention, in the startup with pressure of definite LNG compressor sets, considers the characteristic of each element in system,
And whole system is iterated calculating, and in the continuous elevation process of generating unit speed, computing system performance parameter；Can be to judge
Can unit, which start, provides accurate foundation.In addition, when calculating, consider that specific volumes at different levels change to compressor needs than matching relationship
Power, the influence of compressor pneumatic power, outlet pressure, therefore can further ensure to calculate accurately and reliably.
By technical scheme, can automatically determine LNG compressor sets start under band pressure condition, improve
LNG compressor sets are with pressure to start definite accuracy rate, in addition, when calculating, considers specific volumes at different levels than matching relationship change to pressure
Contracting machine needs power, the influence of compressor pneumatic power, outlet pressure, therefore can further ensure to calculate accurately and reliably.
In the above-described embodiments, the description to each embodiment all emphasizes particularly on different fields, and does not have the portion being described in detail in some embodiment
Point, it may refer to the associated description of other embodiment.
It is understood that the correlated characteristic in the above method and device can be referred to mutually.In addition, in above-described embodiment
" first ", " second " etc. be to be used to distinguish each embodiment, and do not represent the quality of each embodiment.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, may be referred to the corresponding process in preceding method embodiment, details are not described herein.
Algorithm and display be not inherently related to any certain computer, virtual system or miscellaneous equipment provided herein.
Various general-purpose systems can also be used together with example based on this.As described above, required by constructing this kind of system
Structure be obvious.In addition, the present invention is not also directed to any certain programmed language.It should be understood that it can utilize various
Programming language realizes the content of invention described herein, and the description done above to language-specific is to disclose this hair
Bright preferred forms.
In the specification that this place provides, numerous specific details are set forth.It is to be appreciated, however, that the implementation of the present invention
Example can be put into practice in the case of these no details.In some instances, known method, structure is not been shown in detail
And technology, so as not to obscure the understanding of this description.
Similarly, it will be appreciated that in order to simplify the disclosure and help to understand one or more of each inventive aspect,
Above in the description to the exemplary embodiment of the present invention, each feature of the invention is grouped together into single implementation sometimes
In example, figure or descriptions thereof.However, the method for the disclosure should be construed to reflect following intention：I.e. required guarantor
The application claims of shield features more more than the feature being expressly recited in each claim.It is more precisely, such as following
Claims reflect as, inventive aspect is all features less than single embodiment disclosed above.Therefore,
Thus the claims for following embodiment are expressly incorporated in the embodiment, wherein each claim is in itself
Separate embodiments all as the present invention.
Those skilled in the art, which are appreciated that, to carry out adaptively the module in the equipment in embodiment
Change and they are arranged in one or more equipment different from the embodiment.Can be the module or list in embodiment
Member or component be combined into a module or unit or component, and can be divided into addition multiple submodule or subelement or
Sub-component.In addition at least some in such feature and/or process or unit exclude each other, it can use any
Combination is disclosed to all features disclosed in this specification (including adjoint claim, summary and attached drawing) and so to appoint
Where all processes or unit of method or equipment are combined.Unless expressly stated otherwise, this specification (including adjoint power
Profit requires, summary and attached drawing) disclosed in each feature can be by providing the alternative features of identical, equivalent or similar purpose come generation
Replace.
In addition, it will be appreciated by those of skill in the art that although some embodiments described herein include other embodiments
In included some features rather than further feature, but the combination of the feature of different embodiments means in of the invention
Within the scope of and form different embodiments.For example, in the following claims, embodiment claimed is appointed
One of meaning mode can use in any combination.
The all parts embodiment of the present invention can be with hardware realization, or to be run on one or more processor
Software module realize, or realized with combinations thereof.It will be understood by those of skill in the art that it can use in practice
Microprocessor or digital signal processor (DSP) come realize it is according to embodiments of the present invention in some or all components
Some or all functions.The present invention is also implemented as performing some or all of method as described herein
Equipment or program of device (for example, computer program and computer program product).Such program for realizing the present invention can be with
Storage on a computer-readable medium, or can have the form of one or more signal.Such signal can from because
Download and obtain on spy's net website, either provide on carrier signal or provided in the form of any other.
It should be noted that the present invention will be described rather than limits the invention for above-described embodiment, and ability
Field technique personnel can design alternative embodiment without departing from the scope of the appended claims.In the claims,
Any reference symbol between bracket should not be configured to limitations on claims.Word "comprising" does not exclude the presence of not
Element or step listed in the claims.Word "a" or "an" before element does not exclude the presence of multiple such
Element.The present invention can be by means of including the hardware of some different elements and being come by means of properly programmed computer real
It is existing.In if the unit claim of equipment for drying is listed, several in these devices can be by same hardware branch
To embody.The use of word first, second, and third does not indicate that any order, can explain these words and run after fame
Claim.
Claims (7)
1. a kind of LNG compressor sets are with pressure to start the system of determining, it is characterised in that including：
Input parameter determining device, for determining startup input data of the LNG compressor sets under with pressure condition；
Inlet flow rate iterates to calculate device, for according to the input parameter, the inlet flow at iterative calculation compressor each moment
Amount；
Inlet pressure iterate to calculate device, for when each moment inlet flow rate convergence when, according to convergent inlet flow
Amount iterates to calculate the inlet pressure at compressor set each moment；
Rotating speed iterates to calculate device, for when the inlet pressure convergence at each moment, iterating to calculate the compressor set
The rotating speed at each moment；
Performance parameter iterates to calculate device, if the rotating speed for each moment meets rotating speed, rise requires, and iterates to calculate
The system performance parameter at the compressor set each moment in rotating speed elevation process；
Start determining device, if meeting predetermined system performance condition for the system performance parameter, it is determined that the LNG compressions
Unit can start under band pressure condition.
2. system according to claim 1, it is characterised in that
The inlet flow rate iterates to calculate device, specifically for the inlet pressure according to input, inlet temperature and specified rotating speed, meter
The performance curve of the compressor at each moment is calculated, valve performance curve, root are calculated according to each valve flow coefficient curve of input
According to pipe network volume, length and the diameter of input, pipe network performance curve is calculated；
The maximum stream flow and the average value of minimum discharge determined according to the performance curve of the compressor, primarily determines that inlet flow
Amount；
According to physical property characteristic parameter in the inlet flow rate and gas component and presetting database, calculate the inlet flow rate and correspond to
Compressor outlet pressure；
The inlet flow rate pair is calculated according to the inlet flow rate, the valve performance curve and the pipe network performance curve respectively
The valve crushing and pipeline crushing answered；
According to the difference of the outlet pressure of the corresponding compressor of the inlet flow rate and the inlet pressure of input, compression is primarily determined that
Machine pressure rises；
If the compressor pressure primarily determined that, which rises, is more than the valve crushing and the pipeline crushing, the inlet flow that will be primarily determined that
Amount is determined as minimum discharge；If the compressor pressure primarily determined that, which rises, is less than the valve crushing and the pipeline crushing, will just
The definite inlet flow rate of step is determined as maximum stream flow；
According to the maximum stream flow or minimum discharge redefined, inlet flow rate is redefined, and determine under new inlet flow rate
Outlet pressure, valve crushing and the pipeline crushing of compressor；
According to new outlet pressure and the inlet pressure of input, determine that new compressor pressure rises, until new compressor pressure rise with
New valve crushing and the difference of new pipeline crushing are less than the first specified tolerance, determine the inlet flow rate convergence of the compressor.
3. system according to claim 1, it is characterised in that
The inlet pressure iterates to calculate device, specifically for according to each moment and corresponding convergence of each moment
Inlet flow rate, determine the change curve that compressor inlet flow changes over time；
Determine total gaseous mass and pipe network volume in pipe network when the compressor set is not actuated；
Is calculated by pipe network and flows into flow and pipe network outflow flow into row interpolation for the change curve according to each moment；
According to it is described not actuated when pipe network in total gaseous mass, the pipe network volume, the pipe network flow into flow and the pipe
Net outflow flow, iterates to calculate the inlet pressure at the compressor set each moment；
If the difference of the inlet pressure at compressor set each moment and the inlet pressure of last iteration, which is less than second, specifies appearance
Difference, it is determined that the inlet pressure convergence at compressor set each moment.
4. system according to claim 1, it is characterised in that
The rotating speed iterates to calculate device, special to the motor of input specifically for the specified rotating speed at each moment according to input
Levy curve and carry out interpolation processing, calculate the specified output power of motor at each moment；
According to compressor series, mass flow and the gas component of input, the compressor pneumatic power at each moment is calculated；
According to the specified rotating speed at each moment and default mechanical loss table, the mechanical loss work at interpolation calculation each moment
Rate；
According to the specified rotating speed at each moment, calculate and specify rotor velocity；
According to the specified output power of motor at each moment, the compressor pneumatic power at each moment, the machine at each moment
Tool wasted power, the specified rotor velocity, rotor moment of inertia, calculate the angular acceleration of rotor；
Time integral is carried out to the angular acceleration；
The specified rotor velocity is adjusted compared with the rotor velocity that integral and calculating obtains, and according to comparative result
The specified rotating speed at each moment, and recalculate and compare, until the rotating speed at each moment calculates convergence.
5. system according to claim 1, it is characterised in that the system performance parameter includes the driving machine work(at each moment
Rate, the maximum outlet pressure of each moment compressor, each moment working conditions of compressor point are compressed apart from the distance of anti-surge line, each moment
The required torque of machine,
The performance parameter iterates to calculate device, the driving machine feature specifically for the rotating speed using each moment to input
Curve carries out interpolation processing, calculates the driving acc power at each moment；According in the gas component and presetting database of input
Gas physical property characteristic parameter, calculate compressor import enthalpy at different levels and outlet enthalpy；According to the convergent import
Flow, the import enthalpy and the outlet enthalpy, calculate the power that the compressor is consumed；
According to the gas after the compressor series of input, diameter at different levels, Stage code name, suction port of compressor valve opening, cooler
Temperature, the pressure loss, iterate to calculate the maximum outlet pressure of each moment compressor and the performance song of each moment compressor
Line；
Valve performance curve is calculated according to each valve flow coefficient curve of input；According to the pipe network volume of input, length and straight
Footpath, calculates pipe network performance curve；Anti-surge line is determined according to each pumping point on the performance curve of each moment compressor；
The crosspoint of the valve performance curve and the pipe network performance curve is determined as the working conditions of compressor point；According to the pressure
Position of the contracting machine operating point on the performance curve, determines distance of each moment working conditions of compressor point apart from anti-surge line；
Interpolation processing is carried out to the motor characteristic curve of input using the rotating speed at each moment, calculates the motor at each moment
Output power；According to compressor series, mass flow and the gas component of input, the compressor pneumatic work at each moment is calculated
Rate；According to the rotating speed at each moment and default mechanical loss table, the mechanical loss power at interpolation calculation each moment；Utilize
The rotating speed at each moment calculates the angular speed at each moment；According to the output power of motor at each moment, described each
The angular speed of the compressor pneumatic power at a moment, the mechanical loss power at each moment and each moment, determines
Each required torque of moment compressor.
6. system according to claim 1, it is characterised in that
The startup determining device, if being more than the work(that is consumed of the compressor specifically for the driving acc power at each moment
Rate, the maximum outlet pressure of each moment compressor are less than default outlet pressure threshold value, each moment working conditions of compressor
Point is more than pre-determined distance threshold value apart from the distance of anti-surge line and each required torque of moment compressor is less than driving machine
The torque sent, it is determined that the LNG compressor sets can start under band pressure condition.
7. system according to claim 6, it is characterised in that the system also includes：
Whether judgment means, the compressor angular acceleration for judging each moment are more than 0；If, it is determined that it is described each
The rotating speed at a moment meets rotating speed rise and requires；If it is not, then increase the startup time of the LNG compressor sets.
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| JPS58124080A (en) * | 1982-01-21 | 1983-07-23 | Toshiba Corp | Motor for compressor |
| CN103133320A (en) * | 2013-02-25 | 2013-06-05 | 长春工业大学 | Torque angle control based air compressor variable speed regulating method |
| CN105864086A (en) * | 2016-05-05 | 2016-08-17 | 沈阳鼓风机集团股份有限公司 | Fully automatic starting control system for high-speed centrifugal blower |
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