CN109519232A - SHRT unit frequency-conversion device auto-adjustment control method synchronous with turbine speed - Google Patents
SHRT unit frequency-conversion device auto-adjustment control method synchronous with turbine speed Download PDFInfo
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- CN109519232A CN109519232A CN201811155295.4A CN201811155295A CN109519232A CN 109519232 A CN109519232 A CN 109519232A CN 201811155295 A CN201811155295 A CN 201811155295A CN 109519232 A CN109519232 A CN 109519232A
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- speed
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- frequency converter
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- frequency
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D19/00—Starting of machines or engines; Regulating, controlling, or safety means in connection therewith
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
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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
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/08—Adaptations for driving, or combinations with, pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/04—Units comprising pumps and their driving means the pump being fluid-driven
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Turbines (AREA)
Abstract
The invention discloses a kind of SHRT unit frequency-conversion device auto-adjustment control methods synchronous with turbine speed: (1) the setting speed regulations speed A in frequency converter；(2) real-time detection operating condition rises revolving speed operation if necessary to unit, executes step (3)；If necessary to unit drop revolving speed operation, (4) are thened follow the steps；(3) unit drop revolving speed operation control: frequency converter issues " preparing reduction of speed " instruction to DEH, steam turbine is from power regulation pattern switching to rotational speed regulation mode, after the completion of switching, I&C system judges whether unit meets reduction of speed condition, if meeting, DEH feedback " allowing reduction of speed " signal after frequency converter receives permission signal, executes unit reduction of speed and adjusts to frequency converter；(4) unit rises revolving speed operation control.Method of the invention be not necessarily to human intervention, efficiently solve occur in speed regulation process because motor current fluctuation caused by frequency converter failure halting problem.Meanwhile variable frequency adjustment SHRT unit is that enterprise generates huge economic benefit.
Description
Technical field
The invention belongs to cogeneration technology neighborhood, it is applied to energy regenerating in Ferrous Metallurgy process and utilizes equipment, specifically
It is a kind of SHRT unit frequency-conversion device auto-adjustment control method synchronous with turbine speed.
Background technique
China's steel and iron industry energy consumption accounts for the 16.3% of national total energy consumption, and energy consumption source is mainly sintered and two works of ironmaking
Section is only second to the 70% of ironmaking workshop section wherein sintering workshop section accounts for 10~20%, so optimization sintering process and power-equipment system
To realize that energy-saving and emission-reduction are particularly important.Main exhauster of sintering is the active equipment of necessity of sintering process, is transported by motor drive
Row is sintering system air feed.The recovery waste heat of sintering system is mainly the of subsequent 3~5 smoke boxes of sintering machine and cooler
At one petticoat pipe, steam is generated by waste heat boiler, with waste heat Steam Turbine Driven electrical power generators.
Traditional sintering waste heat generating unit and motor run main exhauster of sintering unit is two independent units, is subordinate to
Belong to different workshops, the dynamic rotation equipment of different purposes.Sintering waste heat energy regenerating and main exhauster of sintering Unit erriger
(Sinter blower residual Heat Recovery Turbine), abbreviation SHRT unit, as shown in Figure 1, by being sintered
Cogeneration unit and main exhauster of sintering group integrate it is mating form, including Sinter air machine 3, speed change clutch 2, low temperature exhaust heat vapour
Turbine 1, motor 4, I&C system 5, MCC system 6 (electric control system).The advantage of the SHRT crew qiting mode is:
First, generator is eliminated, unit replenishes the energy that sintering waste heat recycles in shafting directly as rotating mechanical energy, with electricity
Motivation Driven by Coaxial main exhauster of sintering, motor need to only export the power of main exhauster of sintering energy consumption and the acting of waste heat steam turbine
Difference.The electric current for reducing former motor running makes the motor for driving main exhauster of sintering reduce electric current online and realize energy conservation；
Second, it does not power to local power grid, has reduced power supply examination and approval procedures；Third improves energy and returns compared with cogeneration unit
Yield 6%~8%；4th, unit waste heat energy regenerating 60%~80%；5th, reduce the goods and materials such as equipment, workshop investment.?
If SHRT unit can be realized converting operation on the basis of this, electric energy can be more effectively reduced while guaranteeing energy high efficiente callback
Consumption.
Currently, SHRT unit is said for dropping revolving speed in use, during motor 4 is adjusted the speed by frequency converter 7
It is bright: in down speeding procedure, since the acting of steam turbine 1 will be so that motor 4 will bear very big opposing torque, to lead to motor 4
Electric current constantly reduces, so that motor 4 enters generating state (because 4 stator revolving speed of motor is less than rotor speed), it is electronic
Machine 4 passes through frequency converter 7 to the reversed inputing power of power grid, and two common quadrant frequency converters do not have the function of reversely inputting, this
Kind 7 DC bus-bar voltage of situation low-converter constantly increases, and final 7 fault trip of frequency converter leads to unit Concatenate shut-down.Therefore,
How SHRT unit realizes that the steady of the speed regulation process of unit is a problem to be solved in conversion process.
Summary of the invention
For the revolving speed control problem of unit during above-mentioned SHRT unit frequency-conversion, the object of the present invention is to provide one
The control method of the synchronous automatic adjustment of steam turbine in kind SHRT unit frequency-conversion down speeding procedure.
To achieve the goals above, the present invention, which adopts the following technical scheme that, is resolved:
A kind of SHRT unit frequency-conversion device auto-adjustment control method synchronous with turbine speed, specifically comprises the following steps:
(1) the setting speed regulations speed A in frequency converter；
(2) real-time detection operating condition rises revolving speed operation if necessary to unit, executes step (3)；If necessary to unit, revolving speed drops
Operation, thens follow the steps (4)；
(3) the operation control of unit drop revolving speed, concrete operations are as follows:
Frequency converter issues " prepare reduction of speed " instruction to DEH, steam turbine from power regulation pattern switching to rotational speed regulation mode,
After the completion of switching, I&C system judges whether unit meets reduction of speed condition, if satisfied, DEH feeds back " allowing reduction of speed " signal to change
Frequency device, frequency converter receive after allowing signal, execute unit reduction of speed and adjust, including operate as follows:
1) in 1s, motor drops revolving speed A by frequency converter and turns；
2) in 2s, the aperture of Steam Turhine Adjustment door is controlled by DEH, and steam turbine is turned into low A and is turned.
1) and 2) 3) electric current of real-time detection motor repeats step, until motor speed reaches mesh after it is stablized
Scale value, drop Rotation Process terminate.
(4) unit rises revolving speed operation control, concrete operations: keeping adjusting Steam Turhine Adjustment door aperture constant, motor is logical
It crosses frequency converter and rises revolving speed until generating unit speed reaches target value.
Further, the speed regulation accuracy of the frequency converter is equal to the degree of regulation of DEH, unit: revolutions per second.
Further, in the step (4), the raising speed rate of the motor is 6~10 revolutions per seconds.
Further, this method further comprises the steps of: steam turbine and enters inlet pressure control, and concrete operations are as follows:
When generating unit speed is adjusted to the electric current stabilization of rotating speed of target and motor, passes through DEH and control Steam Turhine Adjustment porthole
Aperture so that the inlet pressure of steam turbine is always setting pressure.
Compared to the prior art, the advantages of method of the invention, is as follows:
1, method of the invention is not required to human intervention, ensure that and rises the stabilization of current of electric in Rotation Process in unit, has
Effect solve occur in speed regulation process because motor current fluctuation caused by frequency converter failure trip problem.
2, in method of the invention, turbine speed changes with motor, belongs to trailing type control for the control of steam turbine
System, therefore in the case where DEH control precision is not high, advantage is highlighted, and to the of less demanding of revolving speed control algolithm.
3, application is method of the invention it is achieved variable frequency adjustment SHRT unit, further saves electric energy.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of SHRT unit applied by method of the invention.
Fig. 2 is turbine inlet pressure, Steam Turhine Adjustment door aperture control double-closed-loop control block diagram.
The present invention is further explained below in conjunction with the drawings and specific embodiments.
Specific embodiment
The present invention combines the research of drive train process system by recycling to sintering waste heat with Sinter air machine first, and
The research of motor and its mating frequency converter working principle, analysis unit encounter problems in Control of Frequency Control Process, propose unit
Method for controlling speed regulation.
Below according to attached drawing, analyzes the problem of being likely encountered during frequency conversion SHRT set speed adjustment: being had been turned in unit
And in the case where operating normally, due to the variation (as sintering exhausting amount demand reduces) of operating condition, revolving speed operation, reduction of speed need to drop in unit
Process is leading, the cooperation speed regulation of steam turbine 1 with motor 4, it is assumed that steam turbine 1 has neither part nor lot in cooperation and adjusts, and directly passes through frequency conversion
Device 7 reduces by 4 revolving speed of motor, although as a result, the decline of 4 stator revolving speed of motor, the motor 4 under the dragging of steam turbine 1
Rotor speed can't decline (or decline slow), lead to that motor 4 enters generating state, 4 electric current of motor constantly reduces,
Motor 4 starts reversed inputing power to frequency converter 7, and 7 DC bus-bar voltage of frequency converter increases, final 7 failure of frequency converter
Tripping, unit Concatenate shut-down.Based on this, the present invention proposes that steam turbine 1 also necessarily participates in adjusting when Rotation Process drops in motor,
Thinking is to adjust 1 revolving speed of steam turbine by DEH502 to decline (unit rises rotational speed regulation also same the method) together.
Referring to Fig.1, variable frequency adjustment SHRT unit applied by method of the invention, including steam turbine 1, speed change clutch 2,
Sinter air machine 3, motor 4, I&C system 5 (including MIS501, DEH502, PIC503), MCC system with double output shaft
(electric control system) 6, VFDS frequency conversion speed-adjusting system 7, FCV (Steam Turhine Adjustment door) 10, an output shaft end of Sinter air machine 3 with
Motor 4 is coaxially connected, and another output shaft end is coaxially connected (when 1 turn up of steam turbine by speed change clutch 2 and steam turbine 1
It is nibbled to speed change clutch 2 when engaging revolving speed and merges into shafting acting).
The main component in Fig. 1 is illustrated first:
SE 12: speed probe, for detecting 1 revolving speed of steam turbine.
ZT 9: valve position transmitter, for detecting 10 aperture of Steam Turhine Adjustment door FCV.
PT 11: 4 inlet pressure transmitter of steam turbine.
DEH 502: referring to electro-hydraulic control system, gives servo valve 8 (such as VOITH valve) by exporting 4~20mA control signal,
To adjust the aperture of Steam Turhine Adjustment door 10, it can be achieved that the adjusting of turbine speed/power.It is by receiving valve position transmitter
The feedback signal of ZT9 and compared with controlling signal forms closed-loop control system.
VFDS 7: frequency control drive system, i.e. frequency converter.
Current transformer 202: being included in frequency converter 7, the detection of the electric current for motor 4.
MCC 6: motor control center, i.e. electric control system.
PIC 503: turbine inlet pressure controller, the controller are close loop control circuit, and measured value becomes from pressure
Device PT 11 is sent, setting value requires artificial given according to technique.
Engage switch ZS 201: for detecting whether speed change clutch and shaft coupling engage.
Specific implementation method of the invention is described below:
Step 1, frequency conversion SHRT set speed adjustment.Specifically include following sub-step:
(1) the setting speed regulations speed in frequency converter VFDS 7；
Under normal conditions, the speed regulation accuracy of frequency converter 7 is higher than DEH 502, so the minimum value of regulations speed is limited to DEH
502 degree of regulation, can be using the degree of regulation A of DEH502 as rotational speed regulation rate, unit: revolutions per second.
(2) real-time detection operating condition rises revolving speed operation if necessary to unit, executes step (3)；If necessary to unit, revolving speed drops
Operation, thens follow the steps (4)；
(3) the operation control of unit drop revolving speed, concrete operations are as follows:
Frequency converter VFDS7 issues " preparing reduction of speed ", and instruction is to DEH502, and steam turbine 1 is from power regulation pattern switching to revolving speed
Shaping modes, after the completion of switching, I&C system 5 judges whether unit meets reduction of speed condition (i.e. unit normal operation, alarm free
), if satisfied, DEH502 feedback " allowing reduction of speed " signal after frequency converter 7 receives permission signal, executes unit drop to frequency converter 7
Velocity modulation section, including operate as follows:
1) in 1s, motor 4 drops revolving speed A by frequency converter 7 and turns；
2) in 2s, by DEH502 control Steam Turhine Adjustment door 10 aperture, by 1 turn of low A of steam turbine turn (that is to say with
Before adjusting the speed on the basis of the actual speed of steam turbine 1, drop A turns).
3) electric current of real-time detection motor 4, after it is stablized (it is fluctuated in allowed limits procedure judges,
Such as ± 2%), it repeats 1) with 2) step, until 4 revolving speed of motor reaches target value (revolving speed target value is set manually), drop turns
Fast process terminates.
(4) unit rises revolving speed operation control, and concrete operations are as follows:
In boosting velocity procedure, 1 revolving speed of steam turbine is not involved in adjusting and (keeps adjusting Steam Turhine Adjustment door FCV10 aperture not
Become), motor 4 is by 7 liters of revolving speeds of frequency converter until generating unit speed reaches target value (revolving speed target value is by artificial conventional setting)；
When motor 4 passes through 7 liters of revolving speeds of frequency converter, steam turbine 1 is equivalent to be unloaded suddenly, and revolving speed can follow motor 4 naturally
It is promoted, therefore, in order to guarantee that steam turbine 1 can follow 4 liters of revolving speeds of motor in time, 4 raising speed rate 6~10 of motor need to be limited
Revolutions per second.
Step 2, steam turbine 1 enters inlet pressure control model
Since 1 inlet steam of steam turbine will be direct if do not controlled turbine inlet pressure PT11 from boiler
The safe operation of boiler is influenced, so the stabilization of turbine inlet pressure PT11 is particularly significant to technique.Concrete operations are as follows:
When generating unit speed is adjusted to rotating speed of target, the electric current of motor 4 is stablized, by PIC503 controller, DEH502, servo
The double loop system that valve 8, valve position transmitter ZT9, pressure transmitter 11 form investment automatic control control (as shown in Figure 2), that is, pass through
DEH502 controls the aperture of Steam Turhine Adjustment porthole 10, and the inlet pressure of Lai Wending steam turbine 1 is always setting pressure.To protect
Having demonstrate,proved steam turbine 1 can be entire shafting acting under the premise of inlet pressure is stablized, and reduce by 4 power consumption of motor, reach energy conservation
Effect.So far, unit down speeding procedure terminates, and unit operates normally.
The present invention solves the problems, such as variable frequency adjustment SHRT set speed adjustment process, it can be seen that side of the invention
1 revolving speed of steam turbine is actively adjusted with motor 4 in method, thus this method in the case where DEH502 controls the higher situation of precision more
The electric current of tool advantage, entire speed regulation process motor 4 is steady, and speed regulation process is not required to human intervention, has very high automation journey
Degree.In addition, SHRT unit improves the rate of recovery of energy from its working principle, and variable frequency adjustment SHRT unit is tantamount to
It makes something perfect even more perfect, greatly saves electric energy, therefore the inventive method is significant, very big economy can be brought for enterprise
Benefit and value.Method of the invention is verified in the steel SHRT project unit of Handan, the entire electronic electromechanics of speed regulation process
Flow more steady, speed regulation process is full-automatic, is not required to human intervention, efficiently solve occur in down speeding procedure because of electronic electromechanics
Frequency converter failure halting problem caused by stream fluctuates.
Claims (4)
1. a kind of SHRT unit frequency-conversion device auto-adjustment control method synchronous with turbine speed, which is characterized in that specifically include
Following steps:
(1) the setting speed regulations speed A in frequency converter；
(2) real-time detection operating condition rises revolving speed operation if necessary to unit, executes step (3)；If necessary to unit drop revolving speed fortune
Row, thens follow the steps (4)；
(3) the operation control of unit drop revolving speed, concrete operations are as follows:
Frequency converter issues " preparing reduction of speed " instruction to DEH, and steam turbine is from power regulation pattern switching to rotational speed regulation mode, switching
After the completion, I&C system judges whether unit meets reduction of speed condition, if satisfied, DEH feedback " allow reduction of speed " signal is to frequency converter,
Frequency converter receives after allowing signal, executes unit reduction of speed and adjusts, including operates as follows:
1) in 1s, motor drops revolving speed A by frequency converter and turns；
2) in 2s, the aperture of Steam Turhine Adjustment door is controlled by DEH, and steam turbine is turned into low A and is turned.
1) and 2) 3) electric current of real-time detection motor repeats step, until motor speed reaches target after it is stablized
Value, drop Rotation Process terminate.
(4) unit rises revolving speed operation control, concrete operations: keeping adjusting Steam Turhine Adjustment door aperture constant, motor passes through change
Frequency device rises revolving speed until generating unit speed reaches target value.
2. SHRT unit frequency-conversion device as described in claim 1 auto-adjustment control method synchronous with turbine speed, feature
It is, the speed regulation accuracy of the frequency converter is equal to the degree of regulation of DEH, unit: revolutions per second.
3. SHRT unit frequency-conversion device as described in claim 1 auto-adjustment control method synchronous with turbine speed, feature
It is, in the step (4), the raising speed rate of the motor is 6~10 revolutions per seconds.
4. SHRT unit frequency-conversion device as described in claim 1 auto-adjustment control method synchronous with turbine speed, feature
It is, further comprises the steps of: steam turbine and enter inlet pressure control, concrete operations are as follows:
When generating unit speed is adjusted to the electric current stabilization of rotating speed of target and motor, passes through DEH and control opening for Steam Turhine Adjustment porthole
Degree, so that the inlet pressure of steam turbine is always setting pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811155295.4A CN109519232B (en) | 2018-09-30 | 2018-09-30 | Synchronous automatic regulation control method for rotation speed of SHRT unit frequency converter and steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811155295.4A CN109519232B (en) | 2018-09-30 | 2018-09-30 | Synchronous automatic regulation control method for rotation speed of SHRT unit frequency converter and steam turbine |
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| CN109519232A true CN109519232A (en) | 2019-03-26 |
| CN109519232B CN109519232B (en) | 2020-12-04 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110067757A (en) * | 2019-04-02 | 2019-07-30 | 南通常安能源有限公司 | One kind being based on air-introduced machine vapour electricity double drive control system and control method |
| CN111412023A (en) * | 2020-04-03 | 2020-07-14 | 荣信汇科电气技术有限责任公司 | Coordination control method for realizing stable operation of steam-electricity dual-drive system |
| CN111734942A (en) * | 2020-07-06 | 2020-10-02 | 南通航海机械集团有限公司 | Constant-current and constant-pressure control device of ship lubricating oil system and control method thereof |
| CN112832876A (en) * | 2020-12-31 | 2021-05-25 | 威立雅（哈尔滨）热电有限公司 | Method for carrying out isolated network starting operation of steam turbine generator through automatic control system |
| CN112879109A (en) * | 2021-01-14 | 2021-06-01 | 西安陕鼓动力股份有限公司 | Energy recovery method of parallel-connection steam-electricity double-drive coaxial unit based on load distribution |
| CN114961885A (en) * | 2022-05-07 | 2022-08-30 | 中国船舶重工集团公司第七0三研究所 | Power switching method of double-power driving unit |
| WO2023000749A1 (en) * | 2021-07-20 | 2023-01-26 | 海南极锐浩瀚动力系统科技有限公司 | Automatic load regulation, operation and protection method for combined dragging power generation by converter saturated steam turbine and electrical machine |
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| CN111734942A (en) * | 2020-07-06 | 2020-10-02 | 南通航海机械集团有限公司 | Constant-current and constant-pressure control device of ship lubricating oil system and control method thereof |
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| CN112832876A (en) * | 2020-12-31 | 2021-05-25 | 威立雅（哈尔滨）热电有限公司 | Method for carrying out isolated network starting operation of steam turbine generator through automatic control system |
| CN112879109A (en) * | 2021-01-14 | 2021-06-01 | 西安陕鼓动力股份有限公司 | Energy recovery method of parallel-connection steam-electricity double-drive coaxial unit based on load distribution |
| WO2023000749A1 (en) * | 2021-07-20 | 2023-01-26 | 海南极锐浩瀚动力系统科技有限公司 | Automatic load regulation, operation and protection method for combined dragging power generation by converter saturated steam turbine and electrical machine |
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| CN114961885A (en) * | 2022-05-07 | 2022-08-30 | 中国船舶重工集团公司第七0三研究所 | Power switching method of double-power driving unit |
| CN114961885B (en) * | 2022-05-07 | 2023-08-08 | 中国船舶重工集团公司第七0三研究所 | Power switching method of double-power driving unit |
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