CN102587993B - Screw expansion power machine rotation speed control method and system - Google Patents
Screw expansion power machine rotation speed control method and system Download PDFInfo
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- CN102587993B CN102587993B CN201110027173.9A CN201110027173A CN102587993B CN 102587993 B CN102587993 B CN 102587993B CN 201110027173 A CN201110027173 A CN 201110027173A CN 102587993 B CN102587993 B CN 102587993B
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Abstract
The invention discloses a screw expansion power machine rotation speed control method. The screw expansion power machine is accelerated to warm the machine in advance so as to enable the rotation speed of a rotor of the screw expansion power machine to reach the preset rotation speed of a PID(Proportion Integration Differentiation)input point; then PID control is conducted by taking the opening degree of a steam inlet valve of the screw expansion power machine as the input and the rotation speed of the rotor of the screw expansion power machine as the output to enable the rotation speed of the rotor to be stabilized at rated value. The invention further discloses a screw expansion power machine rotation speed control system which comprises an accelerating and machine warming control module, a PID controller and a selector switch. The accelerating and machine warming module is connected between the steam inlet valve and the rotor of the screw expansion power machine. The input end of the PID controller is connected with the steam inlet valve of the screw expansion power machine, and the output end of the PID controller is connected with the rotor of the screw expansion power machine. The selector switch is connected with the accelerating and machine warming module and the PID controller. The screw expansion power machine is fully warmed, which is good for overall smooth operation of the screw expansion power machine, so safety of the equipment and stablility of the system are ensured and the service life of the unit is prolonged.
Description
It is the preference that " 201110002684.5 ", name are called " screw expansion motor method for controlling number of revolution and control system " Chinese patent application that the present invention requires the application number of submitting on 01 07th, 2011, and its full content is incorporated among the present invention by reference.
Technical field
The present invention relates to Technology of Screw Expanding Power Generator field, relate in particular to a kind of screw expansion motor method for controlling number of revolution and control system.
Background technique
Screw expansion motor, can driven rotary equipment (as blower fan, pump, generator etc.) acting for obtained in recent years the new power machine of applications well on market.Particularly can utilize the acting of inferior energy source rotation drawing generator, be high-quality electric energy by inferior Conversion of Energy.The electric energy the sending operation that is connected to the grid, can reach energy-conservation object.
The concrete structure of screw expansion motor please refer to Chinese invention patent application prospectus (CN1540139A), and it is provided with two intermeshing yin, yang helical rotors, and they are arranged in housing by the bearing at two ends; Two ends at housing are provided with front and rear cover, are provided with admission passage and admission road junction on the top of housing, and by yin, yang helical rotor; Below helical rotor, be provided with steam exhausting way; Between housing and the axial plane of yin, yang helical rotor, two pairs of mechanical seal device being respectively housed, is a kind of floating type two-way mechanical seal arrangement.
The working procedure of this screw expansion motor is: hot water, steam and the steam two-phase fluid with uniform temperature and pressure enter the admission road junction of front case through steam passage; In entering the teeth groove of male rotor, the cavity volume of steam or hydrothermal solution increases gradually, and steam or hydrothermal solution step-down cooling are expanded and done work, and promote yin, yang rotor and rotate; Finishing steam or the hydrothermal solution of merit is discharged by steam exhausting way; Power is exported by the output terminal of male rotor, can drive the equipment such as water pump, blower fan or generator.
For this novel screw expansion motor, in order to guarantee the working life of its safe and stable operation and assurance unit, need the rotating speed of specialized designs screw expansion motor to control.
Summary of the invention
The object of this invention is to provide a kind of screw expansion motor method for controlling number of revolution and control system, can make screw expansion motor safe and stable operation.
For solving the problems of the technologies described above, the technological scheme of screw expansion motor method for controlling number of revolution of the present invention is: in advance to screw expansion motor raising speed warming-up, make the rotor speed of screw expansion motor reach a preset rotation speed PID input point rotating speed, the admission valve aperture of screw expansion motor of take is afterwards that the rotor speed of input, screw expansion motor carries out PID control as output, makes the rotor speed of screw expansion motor be stabilized in rated speed.
More preferably, in advance screw expansion motor is carried out to multistage raising speed warming-up.
More preferably, difference speed stabilizing Preset Time between raising speed warm-up periods at different levels.
More preferably, adopt three grades of raising speed warming-ups, comprising:
One-level raising speed warm-up period, makes the rotor speed of screw expansion motor reach first object rotating speed;
Secondary raising speed warm-up period, makes the rotor speed of screw expansion motor reach the second rotating speed of target;
Three grades of raising speed warm-up periods, make the rotor speed of screw expansion motor reach a preset rotation speed PID input point rotating speed.
More preferably,
First object rotating speed is 0.4 ± 0.05 times of rated speed;
The second rotating speed of target is 0.8 ± 0.05 times of rated speed;
It is 0.95 ± 0.05 times of rated speed that preset rotation speed PID drops into some rotating speed.
More preferably, the output of PID controller is carried out to amplitude limit.
The technological scheme of screw expansion motor revolution speed control system of the present invention is to comprise:
Raising speed warming-up control module, between the access admission valve of screw expansion motor and the rotor of screw expansion motor, drops into some rotating speed for making the rotor speed of screw expansion motor reach preset rotation speed PID;
PID controller, the admission valve of input termination screw expansion motor, the rotor of output termination screw expansion motor, for take the admission valve aperture of screw expansion motor, be that the rotor speed of input, screw expansion motor carries out PID control as output, make the rotor speed of screw expansion motor be stabilized in rated speed;
Diverter switch, connects raising speed warming-up control module and PID controller, while reaching preset rotation speed PID input point rotating speed for the rotor speed at screw expansion motor, screw expansion motor is switched to PID state of a control from raising speed warm-up mode.
Alternatively, described diverter switch is MTS.
Alternatively, described diverter switch is automatic transfer switch.
More preferably, comprise amplitude limiter, connect the output terminal of PID controller, for the output that PID is controlled, carry out amplitude limit.
Compared with prior art, the present invention starts to screw expansion motor in specified running, makes the abundant warming-up of screw expansion motor Whole Equipment, reaches good mechanical property; Owing to having optimized climb curve control, can make screw expansion motor Whole Equipment operate steadily, guaranteed the safety of equipment and stablizing of system, be conducive to extend the working life of unit.
Accompanying drawing explanation
Fig. 1 is the flow chart of screw expansion motor method for controlling number of revolution of the present invention;
Fig. 2 is the flow chart of raising speed warm-up period in Fig. 1;
Fig. 3 is the rising-speed characteristic curve of screw expansion motor;
Fig. 4 is the composition frame chart of screw expansion motor revolution speed control system of the present invention;
Fig. 5 is the composition frame chart of raising speed warming-up control module in Fig. 4.
Embodiment
Core of the present invention is, screw expansion motor is started in specified running, makes the abundant warming-up of screw expansion motor Whole Equipment.
In order to make those skilled in the art understand better technological scheme of the present invention, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Referring to Fig. 1, the flow chart for screw expansion motor method for controlling number of revolution one preferred embodiment of the present invention, comprises the following steps:
S101, to screw expansion motor raising speed warming-up.
To the abundant warming-up of screw expansion motor Whole Equipment, object is to make screw expansion motor reach good mechanical property, to guarantee the security of operation of screw expansion motor.
S102, whether the rotor speed that judges screw expansion motor reaches preset rotation speed PID drops into point,
If so, the PID that enters S103 step controls;
If not, continue the raising speed warming-up of S101 step.
S103, carry out PID control, make the rotor speed of screw expansion motor be stabilized in rated speed.
So-called PID controls, and refers to that regulator control law is ratio, integration, differential control, claims again PID to regulate.It is simple in structure with it, good stability, reliable operation, easy to adjust and become one of major technique of industrial control.Wherein, the parameter tuning of PID controller is core content, and it is according to the characteristic of controlled process, to determine the size of scaling factor, intergration time and the derivative time of PID controller.In the present invention,, by the adjust relevant parameters of screw expansion motor of the instruction of prior art, do not repeat them here.
Like this, after the rotor speed of screw expansion motor reaches preset rotation speed PID input point rotating speed, the rotor speed that the admission valve aperture of screw expansion motor of take is input, screw expansion motor is carried out PID control as output, just can make the rotor speed of screw expansion motor be stabilized in rated speed, thereby guarantee that screw expansion motor complete machine operates steadily.
Referring to Fig. 2, it is the flow chart of raising speed warm-up period in Fig. 1.The present invention carries out multistage raising speed warming-up to screw expansion motor in advance, wherein, and difference speed stabilizing Preset Time between raising speed warm-up periods at different levels.As shown in Figure 3, raising speed warm-up period adopts three grades of raising speed warming-ups, comprising:
S201, one-level raising speed warm-up period, make the rotor speed of screw expansion motor reach first object rotating speed, and this first object rotating speed is 0.4 ± 0.05 times of rated speed;
S202, secondary raising speed warm-up period, make the rotor speed of screw expansion motor reach the second rotating speed of target, and this second rotating speed of target is 0.8 ± 0.05 times of rated speed;
S203, three grades of raising speed warm-up periods, make the rotor speed of screw expansion motor reach a preset rotation speed PID input point rotating speed, and it is 0.95 ± 0.05 times of rated speed that this preset rotation speed PID drops into a some rotating speed.
Referring to Fig. 3, be the rising-speed characteristic curve of screw expansion motor, wherein: Vn is rated speed; Vpid is that rotating speed PID drops into some rotating speed; T1 is one-level raising speed warm-up period; T2 is secondary raising speed warm-up period; T3 is three grades of raising speed warm-up periods; T4 is for dropping into after PID control, and screw expansion motor is stabilized in the time of rated speed Vn; Δ t1 is the speed stabilizing time of one-level raising speed warming-up section while reaching 0.4 times of rated speed Vn; Δ t2 is the speed stabilizing time of secondary raising speed warming-up section while reaching 0.8 times of rated speed Vn.As shown in Figure 3, whole rotating speed is divided into three sections and carries out raising speed warming-up, and t1, t2, t3 time are set according to technological requirement, to guarantee that the abundant warming-up of unit is as the criterion.
The raising speed warm-up characteristics curve of setting according to Fig. 3, whole screw expansion motor method for controlling number of revolution is:
(1) before PID controls input (V < Vpid), no matter adopt which kind of method, as long as substantially meet climb curve shown in Fig. 3;
(2) when the rotor speed of screw expansion motor approaches rated speed Vn, speed reaches Vpid, and unit commitment PID moves control, to reach the object of stabilized (steady-state) speed.Especially, in PID controls, increase PID output limiter, so that amplitude limit is carried out in the output that PID is controlled, thereby it is excessive to avoid exporting span of control limit of control, strengthens the stability that PID controls.
Referring to Fig. 4, screw expansion motor revolution speed control system theory diagram of the present invention is shown, it comprises: the parts such as raising speed warming-up control module 500, PID controller 300, amplitude limiter 400, diverter switch 200, wherein:
Raising speed warming-up control module 500, between the diverter switch 200 access admission valves 100 of screw expansion motor and the rotor 600 of screw expansion motor, drops into some rotating speed for making the rotor speed of screw expansion motor reach preset rotation speed PID;
Referring to Fig. 5, it is the composition frame chart of raising speed warming-up control module in Fig. 4.This raising speed warming-up control module 500 is controlled submodule by multistage raising speed warming-up and is formed, and the present embodiment divides three grades of warm speed, wherein:
One-level raising speed warming-up is controlled submodule 501, makes the rotor speed of screw expansion motor reach first object rotating speed;
Secondary raising speed warming-up is controlled submodule 502, makes the rotor speed of screw expansion motor reach the second rotating speed of target;
Three grades of raising speed warming-ups are controlled submodule 503, make the rotor speed of screw expansion motor reach a preset rotation speed PID input point rotating speed.
Wherein: first object rotating speed is 0.4 ± 0.05 times of rated speed, the second rotating speed of target is 0.8 ± 0.05 times of rated speed, and it is 0.95 ± 0.05 times of rated speed that preset rotation speed PID drops into some rotating speed; One-level raising speed warm-up period, secondary raising speed warm-up period, three grades of warm-up periods are specifically set according to the system situation of screw expansion motor, and make difference speed stabilizing Preset Time between raising speed warm-up periods at different levels, do not repeat them here.
Advantage of the present invention is:
(1) screw expansion motor unit starting is in specified running, and the abundant warming-up of Whole Equipment, reaches good mechanical property;
(2) with the climb curve of above-mentioned setting, control, Whole Equipment operates steadily, and guarantees the safety of equipment and stablizing of system.
Above the present invention is described in detail, embodiment is wherein just for helping to understand method of the present invention and core concept thereof.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of the claims in the present invention.
Claims (8)
1. a screw expansion motor method for controlling number of revolution, it is characterized in that, in advance to screw expansion motor raising speed warming-up, make the rotor speed of screw expansion motor reach a preset rotation speed PID input point rotating speed, the rotor speed that the admission valve aperture of screw expansion motor of take is afterwards input, screw expansion motor is carried out PID control as output, make the rotor speed of screw expansion motor be stabilized in rated speed, wherein, raising speed warming-up is three grades of raising speed warming-ups, described three grades of raising speed warming-ups, comprising:
One-level raising speed warm-up period, makes the rotor speed of screw expansion motor reach first object rotating speed;
Secondary raising speed warm-up period, makes the rotor speed of screw expansion motor reach the second rotating speed of target;
Three grades of raising speed warm-up periods, make the rotor speed of screw expansion motor reach a preset rotation speed PID input point rotating speed.
2. screw expansion motor method for controlling number of revolution as claimed in claim 1, is characterized in that, difference speed stabilizing Preset Time between raising speed warm-up periods at different levels.
3. screw expansion motor method for controlling number of revolution as claimed in claim 2, is characterized in that,
First object rotating speed is 0.4 ± 0.05 times of rated speed;
The second rotating speed of target is 0.8 ± 0.05 times of rated speed;
It is 0.95 ± 0.05 times of rated speed that preset rotation speed PID drops into some rotating speed.
4. the screw expansion motor method for controlling number of revolution as described in claim 1～3 any one, is characterized in that, amplitude limit is carried out in the output that PID is controlled.
5. a screw expansion motor revolution speed control system, is characterized in that, comprising:
Raising speed warming-up control module, between the access admission valve of screw expansion motor and the rotor of screw expansion motor, drops into some rotating speed for making the rotor speed of screw expansion motor reach preset rotation speed PID;
PID controller, the admission valve of input termination screw expansion motor, the rotor of output termination screw expansion motor, for take the admission valve aperture of screw expansion motor, be that the rotor speed of input, screw expansion motor carries out PID control as output, make the rotor speed of screw expansion motor be stabilized in rated speed;
Diverter switch, connects raising speed warming-up control module and PID controller, while reaching preset rotation speed PID input point rotating speed for the rotor speed at screw expansion motor, screw expansion motor is switched to PID state of a control from raising speed warm-up mode.
6. screw expansion motor revolution speed control system as claimed in claim 5, is characterized in that, described diverter switch is MTS.
7. screw expansion motor revolution speed control system as claimed in claim 5, is characterized in that, described diverter switch is automatic transfer switch.
8. the screw expansion motor revolution speed control system as described in claim 5～7 any one, is characterized in that, comprises amplitude limiter, connects the output terminal of PID controller, for the output of PID controller is carried out to amplitude limit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110027173.9A CN102587993B (en) | 2011-01-07 | 2011-01-25 | Screw expansion power machine rotation speed control method and system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110002684.5 | 2011-01-07 | ||
| CN201110002684 | 2011-01-07 | ||
| CN201110027173.9A CN102587993B (en) | 2011-01-07 | 2011-01-25 | Screw expansion power machine rotation speed control method and system |
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| CN102587993A CN102587993A (en) | 2012-07-18 |
| CN102587993B true CN102587993B (en) | 2014-02-12 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3977818A (en) * | 1975-01-17 | 1976-08-31 | Hydrothermal Power Co., Ltd. | Throttling means for geothermal streams |
| US5228298A (en) * | 1992-04-16 | 1993-07-20 | Praxair Technology, Inc. | Cryogenic rectification system with helical dry screw expander |
| GB0210018D0 (en) * | 2002-05-01 | 2002-06-12 | Univ City | Plural-screw machines |
| CN101255815A (en) * | 2007-03-04 | 2008-09-03 | 周劲松 | Double-screw type internal combustion engine |
| JP2009257119A (en) * | 2008-04-14 | 2009-11-05 | Kobe Steel Ltd | Steam expander driven air compression apparatus |
| CN201606121U (en) * | 2010-01-27 | 2010-10-13 | 江西佳能新能源发展有限公司 | Environmental-protection energy-saving emission-reduction waste-heat smoke-gas recycling system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02252901A (en) * | 1989-11-24 | 1990-10-11 | Hisaka Works Ltd | Lubricating device for screw expander |
-
2011
- 2011-01-25 CN CN201110027173.9A patent/CN102587993B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3977818A (en) * | 1975-01-17 | 1976-08-31 | Hydrothermal Power Co., Ltd. | Throttling means for geothermal streams |
| US5228298A (en) * | 1992-04-16 | 1993-07-20 | Praxair Technology, Inc. | Cryogenic rectification system with helical dry screw expander |
| GB0210018D0 (en) * | 2002-05-01 | 2002-06-12 | Univ City | Plural-screw machines |
| CN101255815A (en) * | 2007-03-04 | 2008-09-03 | 周劲松 | Double-screw type internal combustion engine |
| JP2009257119A (en) * | 2008-04-14 | 2009-11-05 | Kobe Steel Ltd | Steam expander driven air compression apparatus |
| CN201606121U (en) * | 2010-01-27 | 2010-10-13 | 江西佳能新能源发展有限公司 | Environmental-protection energy-saving emission-reduction waste-heat smoke-gas recycling system |
Non-Patent Citations (2)
| Title |
|---|
| 曹武等.螺杆膨胀动力机技术的探讨.《煤气与动力》.2005,第25卷(第8期),第二页左栏第11-26行. |
| 螺杆膨胀动力机技术的探讨;曹武等;《煤气与动力》;20050831;第25卷(第8期);第二页左栏第11-26行 * |
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Effective date of registration: 20170328 Address after: 338004 Xinyu high tech Development Zone, Jiangxi LDK Avenue, No. 398 Patentee after: Jiangxi Huadian Power Generation Technology Co., Ltd. Address before: No. 398 Seville road 338004 in Jiangxi province high tech Industrial Park in Xinyu City Patentee before: Huadian Electric Power Co., Ltd., Jiangxi |