CN108868908A - Control method, device and the backheat small turbine system of backheat small turbine - Google Patents
Control method, device and the backheat small turbine system of backheat small turbine Download PDFInfo
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- CN108868908A CN108868908A CN201810682846.6A CN201810682846A CN108868908A CN 108868908 A CN108868908 A CN 108868908A CN 201810682846 A CN201810682846 A CN 201810682846A CN 108868908 A CN108868908 A CN 108868908A
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- generator
- small turbine
- backheat
- backheat small
- load
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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
- 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
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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
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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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
- F01D17/10—Final actuators
Abstract
The present invention provides a kind of control method of backheat small turbine, device and backheat small turbine systems；Wherein, this method includes：In start operating performance, load is driven using adjacent furnace steam extraction or motor-driven mode；If driving load by the way of adjacent furnace steam extraction, after backheat small turbine is stable, start generator, adjusts the inlet valve of backheat small turbine to aperture is set, the revolving speed of backheat small turbine is adjusted by generator；If driving load using motor-driven mode, the inlet valve for adjusting backheat small turbine works to aperture, regulator generator is set to Generator Status, and the revolving speed of backheat small turbine is adjusted by generator.Which adjusts the revolving speed of backheat small turbine by generator, so that it is kept big aperture operation into steam control valve, reduces restriction loss, while meeting the safe and reliable operation of fired power generating unit under various working, improve the operational efficiency of generating set；In addition, electrical power generators online also improves economic well-being of workers and staff.
Description
Technical field
The present invention relates to fired power generating unit control technology field, more particularly, to a kind of backheat small turbine control method,
Device and backheat small turbine system.
Background technique
Fired power generating unit just develops towards the direction of high parameter, high efficiency, low emission.For the more high parameter fortune for adapting to unit
Row improves the generating efficiency of unit, reduces energy consumption, as the biggish equipment of power consumption in power plant --- main feed pump and air-introduced machine,
Backheat small turbine rather than motor driven are considered as to improve operational efficiency.Fig. 1 show the driving water supply of backheat small turbine
The schematic diagram of pump and air-introduced machine；When fired power generating unit is in underload, since the power output of backheat small turbine reduces, cause into vapour
The aperture of regulating valve reduces, and the restriction loss of this part can reduce the operational efficiency of unit, simultaneously as when pump or fan type selecting
There are certain allowance, there are certain allowances again with respect to the power output of pump or fan for the type selecting of backheat small turbine, so even if in machine
When group oepration at full load, being also not into steam control valve for backheat small turbine operates in full-gear, and restriction loss can be further
Increase.
For the problem that above-mentioned backheat small turbine restriction loss is big, operational efficiency is low, not yet proposition effective solution side
Case.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of control method of backheat small turbine, device and backheat are small
Turbine system improves the operational efficiency of generating set to reduce restriction loss.
To achieve the goals above, technical solution used in the embodiment of the present invention is as follows：
In a first aspect, the embodiment of the invention provides a kind of control method of backheat small turbine, backheat small turbine point
It is not connected with generator and load；This method is applied to the DCS system of fired power generating unit, including：In start operating performance, using adjacent furnace
Steam extraction or motor-driven mode drive load；The mode of adjacent furnace steam extraction is：Using the vapour source of the adjacent unit of fired power generating unit
Drive load running；Motor-driven mode is：Regulator generator works to electric motor state, to drive load running；Such as
Fruit drives the load by the way of the adjacent furnace steam extraction, in operating condition, after meeting preset condition in start operating performance
It is switched to the machine vapour source and drives the load, after backheat small turbine is stable, start generator, adjust the small steamer of backheat
The inlet valve of machine adjusts the revolving speed of backheat small turbine by generator to aperture is set, if in start operating performance, using electricity
The mode of motivation dragging drives load, and the inlet valve of backheat small turbine is adjusted in operating condition to aperture is set, passes through institute
The control device control generator for stating generator works to Generator Status, adjusts turning for backheat small turbine by generator
Speed.
Further, the above method further includes：Under start operating performance, the process of load is driven by the way of adjacent furnace steam extraction
In, if detecting backheat small turbine chaser, regulator generator works to electric motor state, to drive load running；Load
Feed pump and/or air-introduced machine including fired power generating unit.
Further, the above method further includes：During adjusting the revolving speed of backheat small turbine by the generator,
If the revolving speed for detecting backheat small turbine is more than given threshold or generator chaser, the speed-regulating system of generator is cut off,
Backheat small turbine is adjusted the speed by the MEH of fired power generating unit.
Further, the above method further includes：During adjusting the revolving speed of backheat small turbine by generator, if
Backheat small turbine chaser, regulator generator work to electric motor state, to drive load running.
Further, the above method further includes：Under start operating performance, the process of load is driven by the way of adjacent furnace steam extraction
In, or during adjusting the revolving speed of backheat small turbine by generator, if backheat small turbine chaser, and backheat
MEH system or METS system the refusal generator drive load of small turbine, the operation of control fired power generating unit load down or thermoelectricity
Unit is out of service.
Further, the inlet valve of above-mentioned adjusting backheat small turbine adjusts the small vapour of backheat by generator to aperture is set
The step of revolving speed of turbine, including：Intake valve aperture adjustment signal is sent to the MEH system of backheat small turbine, so that MEH system
System is according to the rate adaptation intake valve of setting to setting aperture；During MEH system adjusts inlet valve, the small vapour of backheat is monitored
Whether the actual speed of turbine is identical as preset rotation speed；After inlet valve is adjusted to setting aperture, the setting aperture is kept simultaneously
The revolving speed of backheat small turbine is adjusted by the speed-regulating system of generator.
Second aspect, the embodiment of the invention also provides a kind of control device of backheat small turbine, backheat small turbines
It is connected respectively with generator and load；The device is set to the DCS system of fired power generating unit；The device includes：Drive module is loaded,
For driving load using adjacent furnace steam extraction or motor-driven mode in start operating performance；The mode of adjacent furnace steam extraction is：Using
The vapour source of the adjacent unit of fired power generating unit drives load running；Motor-driven mode is：Regulator generator works to electronic
Machine state, to drive load running；First rotational speed regulation module, if for driving load by the way of adjacent furnace steam extraction,
In operating condition, it is switched to the machine vapour source driving load after meeting preset condition, after backheat small turbine is stable,
Start generator, adjusts the inlet valve of backheat small turbine to aperture is set, turning for backheat small turbine is adjusted by generator
Speed；Second rotational speed regulation module, if in operating condition, adjusted back for driving load using motor-driven mode
The inlet valve of hot small turbine controls generator by the control device of the generator and works to generator shape to aperture is set
State adjusts the revolving speed of backheat small turbine by generator.
Further, above-mentioned apparatus further includes：Generator Status adjustment module, for being taken out using adjacent furnace under start operating performance
During the mode of vapour drives load, if detecting backheat small turbine chaser, regulator generator works to motor shape
State, to drive load running；Load includes the feed pump and/or air-introduced machine of fired power generating unit.
Further, above-mentioned apparatus further includes：Third rotational speed regulation module, for adjusting the small steamer of backheat by generator
During the revolving speed of machine, if detecting that the revolving speed of backheat small turbine is more than given threshold or generator chaser, cutting
The speed-regulating system of generator adjusts the speed backheat small turbine by the MEH of fired power generating unit.
The third aspect, the embodiment of the invention provides a kind of backheat small turbine system, which includes fired power generating unit
DCS system, generator, the regulating protecting system of generator, backheat small turbine and backheat small turbine regulating protecting system；
The device of above-mentioned second aspect is set in DCS system；Backheat small turbine is connect with above-mentioned DCS system and generator respectively.
The embodiment of the present invention brings following beneficial effect：
The embodiment of the invention provides a kind of control method of backheat small turbine, device and backheat small turbine system,
In start operating performance, load is driven using adjacent furnace steam extraction or motor-driven mode；If driven by the way of adjacent furnace steam extraction
Dynamic load after backheat small turbine is stable, starts generator, adjusts the inlet valve of backheat small turbine to setting aperture,
The revolving speed of backheat small turbine is adjusted by generator；If driving load using motor-driven mode, it is small to adjust backheat
The inlet valve of steam turbine works to aperture, regulator generator is set to Generator Status, adjusts the small steamer of backheat by generator
The revolving speed of machine.Which adjusts the revolving speed of backheat small turbine by the way that generator is added, and opens it greatly into steam control valve holding
Degree operation, reduces restriction loss, while meeting the safe and reliable operation of fired power generating unit under various working, improves generator
The operational efficiency of group；In addition, electrical power generators online also improves economic well-being of workers and staff.
Other features and advantages of the present invention will illustrate in the following description, alternatively, Partial Feature and advantage can be with
Deduce from specification or unambiguously determine, or by implementing above-mentioned technology of the invention it can be learnt that.
To enable the above objects, features and advantages of the present invention to be clearer and more comprehensible, better embodiment is cited below particularly, and match
Appended attached drawing is closed, is described in detail below.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the schematic diagram that backheat small turbine in the prior art drives feed pump and air-introduced machine；
Fig. 2 is the schematic diagram of the backheat small turbine provided in an embodiment of the present invention for being provided with generator；
Fig. 3 is a kind of flow chart of the control method of backheat small turbine provided in an embodiment of the present invention；
Fig. 4 is that a kind of MEH single loop of control method of backheat small turbine provided in an embodiment of the present invention adjusts revolving speed
Schematic diagram；
Fig. 5 is the flow chart of the control method of another backheat small turbine provided in an embodiment of the present invention；
Fig. 6 is a kind of structural schematic diagram of the control device of backheat small turbine provided in an embodiment of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with attached drawing to the present invention
Technical solution be clearly and completely described, it is clear that described embodiments are some of the embodiments of the present invention, rather than
Whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, shall fall within the protection scope of the present invention.
At present when unit is in underload, since the power output of backheat small turbine reduces, lead to opening into steam control valve
Degree reduces, and the restriction loss of this part can reduce the operational efficiency of unit, is based on this, the embodiment of the invention provides a kind of backheats
Control method, device and the backheat small turbine system of small turbine, the technology can be applied to the small vapour of backheat of fired power generating unit
In the control process of turbine or in the control process of other steam turbines.It describes in detail below to the embodiment of the present invention.
Fig. 2 show the schematic diagram for being provided with the backheat small turbine of generator；The backheat small turbine is also connected with negative
It carries, which can be the equipment such as feed pump or blower；The control method of above-mentioned backheat small turbine is applied to fired power generating unit
In DCS (Distributed Control System, dcs), which can be described as again in automatic control industry
Distributed Control System, it is one and is calculated by what process control level and process monitoring level formed by the multistage of tie of communication network
Machine system.
Cold section from reheated steam of the vapour source of above-mentioned backheat small turbine, by the inlet valve of backheat small turbine entrance Lai
It adjusts into vapour aperture, to change throttle flow, controls the revolving speed of backheat small turbine.The steam discharge of above-mentioned backheat small turbine can be into
Enter condenser, can also be used as the vapour source of heater；Backheat small turbine steam extraction can be used for heating main water supply, improve thermal motor
The effectiveness of regenerator of group, and steam extraction series can choose；The acting of backheat small turbine is for driving feed pump or wind
Machine drives load operation.Backheat small turbine drives electrical power generators online while driving the acting of water supply pump or fan, thus
By generator adjust power output come balance water supply pump or fan power output fluctuation, make backheat small turbine into steam control valve always
Big aperture operation, to improve operational efficiency.
Based on the hardware modifications of above-mentioned backheat small turbine, the embodiment of the invention provides a kind of corresponding small steamers of backheat
The control method of machine, the backheat small turbine are connected with generator and load respectively；This method is applied to the DCS system of fired power generating unit
System；Specifically as shown in figure 3, including the following steps：
Step S302 drives load using adjacent furnace steam extraction or motor-driven mode in start operating performance；Adjacent furnace steam extraction
Mode be：Load running is driven using the vapour source of the adjacent unit of fired power generating unit；Motor-driven mode is：Adjust power generation
Machine works to electric motor state, to drive load running；
Step S304 is full in operating condition if driving load by the way of adjacent furnace steam extraction in start operating performance
It is switched to the machine vapour source after sufficient preset condition and drives the load, after backheat small turbine is stable, starts generator, adjusts
The inlet valve of backheat small turbine is saved to aperture is set, the revolving speed of backheat small turbine is adjusted by generator；
Above-mentioned preset condition can meet condition in cold reheated steam for backheat small turbine, that is to say, that adjacent furnace steam extraction is opened
By the vapour source for being switched to this fired power generating unit (being equivalent to above-mentioned the machine vapour source) after backheat small turbine steam quality is qualified after dynamic
To drive load running.
Step S306, if driving load using motor-driven mode in start operating performance, in operating condition,
The inlet valve of backheat small turbine is adjusted to aperture is set, generator is controlled by the control device of the generator and is worked to hair
Motor status adjusts the revolving speed of backheat small turbine by generator.
The inlet valve of above-mentioned adjusting backheat small turbine adjusts above-mentioned backheat small turbine to aperture is set, by generator
Revolving speed the step of, can specifically be accomplished in the following manner：
To the MEH system of above-mentioned backheat small turbine send inlet valve aperture regulation signal so that above-mentioned MEH system according to
The above-mentioned intake valve of the rate adaptation of setting is to setting aperture；During above-mentioned MEH system adjusts above-mentioned inlet valve, in monitoring
Whether the actual speed for stating backheat small turbine is identical as preset rotation speed；
After above-mentioned inlet valve is adjusted to setting aperture, the setting aperture is kept and by the speed-regulating system of above-mentioned generator
Adjust the revolving speed of above-mentioned backheat small turbine.
Feed pump and air inducing are needed to meet boiler feedwater and air inducing demand without steam when just starting due to fired power generating unit
Machine operation.For meet demand, backheat small turbine can be driven using the steam extraction from adjacent furnace as vapour source, or utilize power generation
Machine operates in electric motor state to drag feed pump or fan operation.
The mode of above-mentioned neighbour's furnace steam extraction can be used on enlarging power plant either second unit.It is attracted by adjacent furnace
Vapour source of the steam as backheat small turbine passes through MEH (the Micro Electro Hydraulic of backheat small turbine
Control system, small turbine electromechanics liquid control system) aperture of inlet valve is adjusted to control turning for backheat small turbine
Speed, to meet the needs of load, generator does not put into whole service at this time.
When adjacent furnace steam extraction, the speed regulation of MEH single loop is can be used in the revolving speed of backheat small turbine, and schematic diagram is as shown in Figure 4.It is first
First input the rotary speed instruction of backheat small turbine；The rotary speed instruction by PID (Proportion, Integral,
Derivative, ratio, integral, differential) controller adjusts inlet valve aperture；Throttle flow should be changed into steam control valve aperture,
Control backheat small turbine revolving speed；Then backheat small turbine revolving speed and will be in the speed feedback to the rotary speed instruction is exported；
Inlet valve aperture is adjusted again by above-mentioned rotary speed instruction and velocity feedback, until the stabilization of speed of entire fired power generating unit.
Above-mentioned motor-driven mode is that generator is operated in electric motor state, and backheat small turbine is not put into entirely
Start operational process, is similar to electrically driven feed pump, that is, rotary speed instruction can be received by the frequency converter of generator, it is negative to adjust
Idling speed.
If load is driven by the way of above-mentioned adjacent furnace steam extraction, in operating condition, first cold in start operating performance
Reheated steam switches the machine vapour source after meeting condition, and then MEH single loop adjusts the speed, after backheat small turbine is stable,
Generator system speed regulation is put into, that is, MEH receives the command signal of DCS system, to tune up the pitch aperture of inlet valve, MEH
Slowly increase inlet valve aperture according to certain rate, after reaching presetting aperture, keeps the default aperture and by generating electricity
The speed regulation device of machine adjusts revolving speed.
If driving load using above-mentioned motor-driven mode in start operating performance, in operating condition, due to returning
The inlet valve pitch of hot small turbine is opened greatly, and generator is slowly become generator operation from motoring, and is disturbed
It is smaller.
The embodiment of the invention provides a kind of control method of backheat small turbine, which is adjusted by the way that generator is added
The revolving speed for saving backheat small turbine makes its inlet valve keep big aperture operation, reduces restriction loss, while meeting a variety of works
The safe and reliable operation of fired power generating unit under condition, improves the operational efficiency of generating set；In addition, electrical power generators online also improves
Economic well-being of workers and staff.
Above described embodiment describes under start operating performance and operating condition, the control mode of backheat small turbine；This hair
Bright embodiment additionally provides the control method of another backheat small turbine, emphasis description backheat small turbine under accident conditions
Control mode.
Under start operating performance, during driving load by the way of adjacent furnace steam extraction, if detecting the small steamer of backheat
Machine chaser, regulator generator work to electric motor state, to drive above-mentioned load running；The load includes the water supply of fired power generating unit
Pump and/or air-introduced machine；That is, the load can only include water pump or air-introduced machine, it can also only include water pump and air-introduced machine.It is specific and
Speech, the backheat small turbine can only drive water pump or air-introduced machine, can also drive water pump and air-introduced machine simultaneously.
The backheat small turbine started using adjacent furnace steam extraction mode, when switching vapour source after cold reheated steam meets condition,
And inlet valve aperture is adjusted with the demand of responsive load, in the process, if the MEH of DCS system or backheat small turbine by MEH
System or METS system detection can be by generating electricity in the case where backheat small turbine conditions permit to backheat small turbine chaser
Machine operates in electric motor state to drag load, when backheat small turbine switches vapour source after cold reheated steam meets condition, makes
Generator puts into operation to adjust backheat small turbine revolving speed, and MEH slowly increases inlet valve by preset rate at this time
Aperture, until inlet valve keeps larger opening.
In actual implementation, whether can preset in above-mentioned DCS system or the MEH system of backheat small turbine allows
Generator dragging loads, such as the mark of "allow" or "No" is saved in specified storage region；Such as in above situation
Under, when backheat small turbine chaser, the mark in above-mentioned storage region is first searched, is determined whether to start generator according to the mark
Dragging load.
During adjusting the revolving speed of backheat small turbine by above-mentioned generator, if detecting the small steamer of the backheat
The revolving speed of machine is more than given threshold or above-mentioned generator chaser, cuts off the speed-regulating system of above-mentioned generator, passes through fired power generating unit
MEH above-mentioned backheat small turbine is adjusted the speed, that is, above-mentioned MEH single loop speed regulation can be used.
During adjusting the revolving speed of above-mentioned backheat small turbine by above-mentioned generator, if the backheat small turbine
Chaser adjusts above-mentioned generator and works to electric motor state, to drive the load running.
Under start operating performance, during driving load by the way of adjacent furnace steam extraction, or passing through above-mentioned generator
During the revolving speed for adjusting above-mentioned backheat small turbine, if above-mentioned backheat small turbine chaser, and the small steamer of above-mentioned backheat
MEH system or METS system the refusal generator drive load of machine, then can control the operation of fired power generating unit load down or fire
Motor group is out of service.
Aforesaid way is to issue the processing method of raw accident conditions in start operating performance, if there is revolving speed deviation it is excessive or hair
The case where motor chaser, cuts off Generator Governor, changes and adjusted the speed by MEH single loop.If during thermal power unit operation, out
The hypervelocity of existing backheat small turbine, the phenomenons such as axis vibration is big, lubricating oil pressure is low, lead to backheat small turbine chaser.If backheat is small
Steam turbine chaser can be operated in electric motor state by generator in the case where small steam turbine allows and drag load；If the small vapour of backheat
Turbine chaser does not allow generator dragging load, then considers the operation of fired power generating unit load down or stop thermal power unit operation.It can be with
Improve the safety and reliability of thermal power unit operation.
The embodiment of the invention also provides another backheat small turbine control methods；In this method, backheat small turbine
Under start operating performance and operating condition, METS (Micro Emergency Trip System small turbine emergency tripping system)
The action state of real-time monitoring backheat small turbine carries out tripping processing to backheat small turbine in case of exception；Generator
Regulating protecting system monitors Generator Status and carries out tripping processing to generator if generator is abnormal.When METS chaser
Or when generator chaser, the processing mode of corresponding accident conditions is taken to control backheat small turbine in time, as shown in figure 5, specifically
It is described as follows.
After starting fired power generating unit using adjacent furnace steam extraction mode, if boiler circuit circulation is established, backheat small turbine is once again
Hot cold section of steam meets the vapour source that can be used as backheat small turbine into vapour requirement, then backheat small turbine activated vapor, and leads to
It crosses MEH single loop and adjusts fired power generating unit revolving speed, to meet loading demand；If steam/water circulating is not set up, using adjacent furnace steam extraction side
Formula starts backheat small turbine.Otherwise, start generator, and generator is made to operate in electric motor state, using motor run
Mode starts fired power generating unit, and receives rotary speed instruction by the frequency converter of generator, meets the needs of load to adjust revolving speed.
Under adjacent furnace steam extraction Starting mode, the action state of the METS of the real-time monitoring backheat small turbine, if METS is dynamic
Make, in the case where backheat small turbine conditions permit, Starting mode is dragged using generator, passes through electric generator frequency-converter tune
Speed stops the operation of backheat small turbine in the case where backheat small turbine condition does not allow；If METS is not operating, backheat
Small turbine switches vapour source after cold reheated steam meets condition, is adjusted the speed by MEH single loop and is responded with adjusting inlet valve aperture
Loading demand monitors the action state of the METS of backheat small turbine again, if METS is acted, takes and above-mentioned METS chaser phase
With treatment measures, if METS is not operating, put into Generator Governor, MEH be used for receive DCS system transmission open greatly into vapour
The command signal of valve pitch, MEH system slowly increase inlet valve pitch aperture according to the preset rate of DCS system, and
During increasing inlet valve pitch aperture, whether the rotary speed actual value for monitoring above-mentioned backheat small turbine issues with command signal
Revolving speed it is consistent, when pitch aperture increase until keep larger opening after, by generator speed regulation device adjust the small steamer of backheat
The revolving speed of machine.
Under above-mentioned generator speed regulation state, if generator and METS is not operating (is equivalent to generator and METS does not have
Have chaser), then it is always maintained at generator speed regulation；If generator action, METS are not operating, return to above-mentioned backheat small turbine and exist
Cold reheated steam switches vapour source after meeting condition, the state adjusted the speed by MEH single loop；If generator and METS are acted, or
When METS is acted and backheat small turbine does not allow the frequency converter timing of generator, stop the operation of backheat small turbine；If power generation
Machine is not operating, METS is acted and backheat small turbine conditions permit, drags Starting mode using generator, passes through the change of generator
The speed regulation of frequency device.
In the case where above-mentioned generator drags Starting mode, the action state of real-time monitoring generator, if generator is not operating,
Above-mentioned Generator Governor is returned to, MEH system follows the instruction of DCS system to increase the pitch aperture of inlet valve；If power generation
Motor-driven work is started using adjacent furnace steam extraction mode again in the case where backheat small turbine conditions permit, the speed regulation of MEH single loop,
In the case where backheat small turbine condition does not allow, stop the operation of backheat small turbine.
In the speed-regulating system of above-mentioned generator, since the system puts into operation always, and backheat small turbine inlet valve
Pitch open greatly, generator slowly become from motoring generator operation, and disturb it is smaller, improve operation effect
Rate.Above-described embodiment gives specific control program according to power plant's difference operating condition, and in view of that may occur in operational process
Accident, and take corresponding failure excision measure, ensured the normal operation and reliability of backheat small turbine, further
Improve the operational efficiency of fired power generating unit.
Corresponding to above method embodiment, a kind of structure of the control device of backheat small turbine shown in Figure 6 is shown
It is intended to；The backheat small turbine is connected with generator and load respectively；The device is set to the DCS system of fired power generating unit, the dress
Set including：
Drive module 60 is loaded, for driving using adjacent furnace steam extraction or motor-driven mode negative in start operating performance
It carries；The mode of above-mentioned neighbour's furnace steam extraction is：Above-mentioned load running is driven using the vapour source of the adjacent unit of above-mentioned fired power generating unit；It is above-mentioned
Motor-driven mode is：It adjusts above-mentioned generator to work to electric motor state, to drive above-mentioned load running；
First rotational speed regulation module 61, if transported for driving above-mentioned load by the way of above-mentioned adjacent furnace steam extraction
In row operating condition, it is switched to the machine vapour source driving load after meeting preset condition, when above-mentioned backheat small turbine is stable
Afterwards, start above-mentioned generator, adjust the inlet valve of above-mentioned backheat small turbine to aperture is set, adjusted by above-mentioned generator
State the revolving speed of backheat small turbine；
Second rotational speed regulation module 62, if transported for driving above-mentioned load using above-mentioned motor-driven mode
In row operating condition, the inlet valve of above-mentioned backheat small turbine is adjusted to aperture is set, is controlled by the control device of above-mentioned generator
Above-mentioned generator works to Generator Status, and the revolving speed of above-mentioned backheat small turbine is adjusted by above-mentioned generator.
Above-mentioned apparatus further includes：Generator Status adjustment module is used under start operating performance, by the way of adjacent furnace steam extraction
During driving above-mentioned load, if detecting above-mentioned backheat small turbine chaser, adjusts above-mentioned generator and work to electronic
Machine state, to drive above-mentioned load running；Above-mentioned load includes the feed pump and/or air-introduced machine of above-mentioned fired power generating unit.
Above-mentioned apparatus further includes：Third rotational speed regulation module, for adjusting the above-mentioned small vapour of backheat by above-mentioned generator
During the revolving speed of turbine, if detecting that the revolving speed of above-mentioned backheat small turbine is more than given threshold or above-mentioned generator
Chaser cuts off the speed-regulating system of above-mentioned generator, is adjusted by the MEH of above-mentioned fired power generating unit to above-mentioned backheat small turbine
Speed.
The control device of a kind of backheat small turbine provided in an embodiment of the present invention, with a kind of time provided by the above embodiment
The control method of hot small turbine technical characteristic having the same reaches identical so also can solve identical technical problem
Technical effect.
The present embodiment additionally provides a kind of a kind of backheat small turbine system corresponding to the above method embodiment.This is
System includes the DCS system of fired power generating unit, generator, the regulating protecting system of generator, backheat small turbine, backheat small turbine
Regulating protecting system.
Above-mentioned apparatus is set in above-mentioned DCS system, above-mentioned backheat small turbine respectively with above-mentioned DCS system and above-mentioned hair
Motor connection.
The embodiment of the invention provides a kind of backheat small turbine control method, device and backheat small turbine system, bases
In the steam extraction backheat small turbine system of generator speed regulation, for driving feed pump or fan operation, to reduce electrically driven feed pump
Or the house-service consumption of electric fan；Meanwhile the lower steam extraction of the degree of superheat improves high-pressure heater fortune for heating high-pressure feed water
Line efficiency, also, small turbine revolving speed is adjusted by the power output of change generator, it avoids caused by adjusting inlet valve aperture
Restriction loss, to meet loading demand.This system can play bigger in high parameter, large capacity, efficient fired power generating unit
Benefit, and the control method of the system meets the various operating conditions of entire unit.
A kind of backheat small turbine control method, device provided by the embodiment of the present invention and backheat small turbine system
Computer program product, the computer readable storage medium including storing program code, the instruction that said program code includes
It can be used for executing previous methods method as described in the examples, specific implementation can be found in embodiment of the method, and details are not described herein.
It, can be with if the function is realized in the form of SFU software functional unit and when sold or used as an independent product
It is stored in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially in other words
The part of the part that contributes to existing technology or the technical solution can be embodied in the form of software products, the meter
Calculation machine software product is stored in a storage medium, including some instructions are used so that a computer equipment (can be a
People's computer, server or network equipment etc.) it performs all or part of the steps of the method described in the various embodiments of the present invention.
And storage medium above-mentioned includes：USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited
The various media that can store program code such as reservoir (RAM, Random Access Memory), magnetic or disk.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " second ",
" third " is used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
Finally it should be noted that：Embodiment described above, only a specific embodiment of the invention, to illustrate the present invention
Technical solution, rather than its limitations, scope of protection of the present invention is not limited thereto, although with reference to the foregoing embodiments to this hair
It is bright to be described in detail, those skilled in the art should understand that：Anyone skilled in the art
In the technical scope disclosed by the present invention, it can still modify to technical solution documented by previous embodiment or can be light
It is readily conceivable that variation or equivalent replacement of some of the technical features；And these modifications, variation or replacement, do not make
The essence of corresponding technical solution is detached from the spirit and scope of technical solution of the embodiment of the present invention, should all cover in protection of the invention
Within the scope of.Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. a kind of control method of backheat small turbine, which is characterized in that the backheat small turbine respectively with generator and negative
Carry connection；The method is applied to the DCS system of fired power generating unit；The method includes：
In start operating performance, the load is driven using adjacent furnace steam extraction or motor-driven mode；The side of neighbour's furnace steam extraction
Formula is：The load running is driven using the vapour source of the adjacent unit of the fired power generating unit；Motor-driven mode is：
It adjusts the generator to work to electric motor state, to drive the load running；
If driving the load by the way of the adjacent furnace steam extraction in start operating performance, in operating condition, meet default
The machine vapour source is switched to after condition drives the load to start the generator after backheat small turbine is stable,
The inlet valve of the backheat small turbine is adjusted to aperture is set, turning for the backheat small turbine is adjusted by the generator
Speed；
If driving the load using motor-driven mode in start operating performance, in operating condition, institute is adjusted
The inlet valve of backheat small turbine is stated to setting aperture, by the control device of the generator control the generator work to
Generator Status adjusts the revolving speed of the backheat small turbine by the generator.
2. the method according to claim 1, wherein the method also includes：
Under start operating performance, during driving the load by the way of adjacent furnace steam extraction, if detecting that the backheat is small
Steam turbine chaser adjusts the generator and works to electric motor state, to drive the load running；The load includes described
The feed pump and/or air-introduced machine of fired power generating unit.
3. according to the method described in claim 2, it is characterized in that, the method also includes：
During adjusting the revolving speed of the backheat small turbine by the generator, if detecting the small vapour of the backheat
The revolving speed of turbine is more than given threshold or the generator chaser, cuts off the speed-regulating system of the generator, passes through the fire
The MEH of motor group adjusts the speed the backheat small turbine.
4. the method according to claim 1, wherein the method also includes：
During adjusting the revolving speed of the backheat small turbine by the generator, if the backheat small turbine is jumped
Machine adjusts the generator and works to electric motor state, to drive the load running.
5. the method according to claim 1, wherein the method also includes：
Under start operating performance, during driving the load by the way of adjacent furnace steam extraction, or passing through the generator
During the revolving speed for adjusting the backheat small turbine, if the backheat small turbine chaser, and the small steamer of the backheat
The MEH system or METS system of machine are refused to load described in the generator drive, control the fired power generating unit load down operation or
Fired power generating unit described in person is out of service.
6. the method according to claim 1, wherein the inlet valve for adjusting the backheat small turbine is to setting
The step of determining aperture, the revolving speed of the backheat small turbine adjusted by the generator, including：
Inlet valve aperture regulation signal is sent to the MEH system of the backheat small turbine, so that the MEH system is according to setting
Rate adaptation described in intake valve to setting aperture；During the MEH system adjusts the inlet valve, monitoring is described to be returned
Whether the actual speed of hot small turbine is identical as preset rotation speed；
After the inlet valve is adjusted to setting aperture, the setting aperture and the speed-regulating system tune by the generator are kept
Save the revolving speed of the backheat small turbine.
7. a kind of control device of backheat small turbine, which is characterized in that the backheat small turbine respectively with generator and negative
Carry connection；Described device is set to the DCS system of fired power generating unit；Described device includes：Drive module is loaded, in starting work
In condition, the load is driven using adjacent furnace steam extraction or motor-driven mode；The mode of neighbour's furnace steam extraction is：Using described
The vapour source of the adjacent unit of fired power generating unit drives the load running；Motor-driven mode is：Adjust the power generation
Machine works to electric motor state, to drive the load running；
First rotational speed regulation module, if for driving the load by the way of the adjacent furnace steam extraction, in operating condition,
The machine vapour source driving load, after the backheat small turbine is stable, starting institute are switched to after meeting preset condition
Generator is stated, the inlet valve of the backheat small turbine is adjusted to aperture is set, it is small that the backheat is adjusted by the generator
The revolving speed of steam turbine；
Second rotational speed regulation module, if for driving the load using motor-driven mode, in operating condition
In, the inlet valve of the backheat small turbine is adjusted to aperture is set, and the hair is controlled by the control device of the generator
Motor works to Generator Status, and the revolving speed of the backheat small turbine is adjusted by the generator.
8. device according to claim 7, which is characterized in that described device further includes：
Generator Status adjustment module, for driving the process of the load by the way of adjacent furnace steam extraction under start operating performance
In, if detecting the backheat small turbine chaser, adjusts the generator and work to electric motor state, it is described negative to drive
Carrying row；The load includes the feed pump and/or air-introduced machine of the fired power generating unit.
9. device according to claim 7, which is characterized in that described device further includes：
Third rotational speed regulation module, for during adjusting the revolving speed of the backheat small turbine by the generator,
If the revolving speed for detecting the backheat small turbine is more than given threshold or the generator chaser, the generator is cut off
Speed-regulating system, the backheat small turbine is adjusted the speed by the MEH of the fired power generating unit.
10. a kind of backheat small turbine system, which is characterized in that the control system includes the DCS system of fired power generating unit, power generation
Machine, the regulating protecting system of the generator, backheat small turbine and the backheat small turbine regulating protecting system；
The described in any item devices of claim 7-9 are set in the DCS system；The backheat small turbine respectively with it is described
DCS system is connected with the generator.
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| CN201810682846.6A CN108868908A (en) | 2018-06-26 | 2018-06-26 | Control method, device and the backheat small turbine system of backheat small turbine |
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| CN114017146A (en) * | 2021-10-29 | 2022-02-08 | 华能秦煤瑞金发电有限责任公司 | Method for starting double-machine regenerative small steam turbine without electric pump and carrying load |
| 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 |
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