CN104633638B - The integrated control method of the shutdown not blowing out function of power plant FCB - Google Patents
The integrated control method of the shutdown not blowing out function of power plant FCB Download PDFInfo
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- CN104633638B CN104633638B CN201410727011.XA CN201410727011A CN104633638B CN 104633638 B CN104633638 B CN 104633638B CN 201410727011 A CN201410727011 A CN 201410727011A CN 104633638 B CN104633638 B CN 104633638B
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- 210000004907 gland Anatomy 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 6
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- RLQJEEJISHYWON-UHFFFAOYSA-N flonicamid Chemical compound FC(F)(F)C1=CC=NC=C1C(=O)NCC#N RLQJEEJISHYWON-UHFFFAOYSA-N 0.000 claims description 3
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- 238000005259 measurement Methods 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims description 3
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Abstract
The present invention relates to the integrated control method of the shutdown not blowing out function of power plant FCB, main inclusion：The trigger condition of FCB actuating signal and reset condition, the control process of FCB actuating signal occurrence time each subsystem of group, how FCB actuating signal ensures unit safety, stablizes, quickly returns to and net state after occurring；The present invention can apply in any DCS control system, by this control strategy, can be under the operating mode of steam turbine tripping operation or generator tripping, ensure that boiler does not stop working, make unit quickly again grid-connected, saved the cost that boiler restarts, decrease the life consumption that boiler is caused due to start and stop, extend the service life of boiler, also improve the automaticity of system simultaneously, its Financial cost reducing and application prospect are limitless.
Description
Technical field
The invention belongs to the shutdown not blowing out work(of the technical field of power plant units control method, more particularly, to power plant FCB
Can integrated control method, specially thermal power plant's Turbo-generator Set steam turbine tripping operation or generator tripping in the case of,
How to ensure that boiler keeps minimum steady combustion load to continue stable operation and how quickly to recover unit load safety and stability fortune
OK.
Background technology:
Most domestic Large Copacity fired power generating unit does not possess FCB function, only a few power plant in design just at present
Phase considers FCB function.FCB has three types:(1) there is external fault, such as low frequency, step-out etc. in electromotor, and steam turbine is not jumped
Lock, band station-service electric load continues to run with；(2) transformer unit internal fault connection jumps steam turbine or steam turbine fault trip, and boiler keeps
Steady combustion；(3) there are some faults, such as overvoltage etc., generator tripping in electromotor, but steam turbine is not tripped.The main pin of the present invention
Second type to FCB, that is, steam turbine due to certain fault occur trip accident when electromotor off-the-line or electromotor due to
Certain protection or other reasonses tripping operation or during off-the-line, steam turbine intertripping, at this moment boiler do not stop working, can quickly lighten the burden
Lotus, reduces boiler combustion rate, maintains minimum steady combustion load, keeps main vapour parameter stability, can be quick again according to grid requirements
Grid-connected.This integrated control method shutting down not blowing out can lead to unit trip or generator tripping connection in steam turbine tripping operation
Under the operating mode of lock tripping operation steam turbine, make unit quickly again grid-connected, saved the cost that boiler restarts, decrease boiler by
The life consumption causing in start and stop, extends the service life of boiler, substantially increases the automaticity of system, simultaneously to electricity
The fast quick-recovery of net plays a key effect.
Content of the invention：
The present invention is directed to above-mentioned problems of the prior art, there is provided a kind of Comprehensive Control side of shutdown not blowing out
Method.Its purpose is to guarantee Turbo-generator Set in steam turbine tripping operation under the operating mode of off-grid off-the-line or electromotor off-the-line,
Boiler does not stop working, can fast cutback, reduce boiler combustion rate, maintain minimum steady combustion load, keep main vapour parameter stability, can
With quickly again grid-connected according to grid requirements.
The technical solution adopted for the present invention to solve the technical problems is：
The integrated control method of the shutdown not blowing out function of power plant FCB, main inclusion：The trigger condition of FCB actuating signal
And reset condition, the control process of FCB actuating signal occurrence time each subsystem of group, FCB actuating signal occur after how
Ensure unit safety, stablize, quickly return to and net state；
The trigger condition of described FCB actuating signal and reset condition, including any one in following terms and conditions or several
Kind：
（1）Capital equipment no significant deficiency；Operating mechanism is flexible；Main and auxiliary machine normal operation；
（2）DCS system is working properly, and history station is working properly, and main supervisory instrument is qualified through verifying, and instruction is accurately；
（3）Unit various main protection loop ensures that 100% puts into operation, and equal safety action is reliable；
（4）Boiler combustion management system, steam turbine safety monitoring system, deaerator level and high and low plus water level protection, steam turbine
Prevent into relevant steam turbines such as water conservation, subsidiary engine interlock protections, boiler thermal technology is automatic, the device such as protect, interlock adjust data correctly,
Action is normal；
（5）TURBINE OVERSPEED PROTECTION DEVICE is good, and electricity exceeds the speed limit, mechanical overspeed protection working value should be in 110% rated speed model
In enclosing；
（6）Each section of check gate interlock action of drawing gas is correct, closes reliable rapidly, the shut-in time is qualified, and each hydrophobic valve is opened
Close good；
（7）Vacuum breaking door trip is handy, reliable in action；
（8）Grease pump, jacking(oil) pump are in good resting state；
（9）EH oil system is working properly, reliable；
（10）Boiler safety door, Pcv valve are through pass the test, reliable in action；
（11）Oxygen-eliminating device and packing standby steam source and switching facility reliability；
（12）Steam turbine prevents accurate into water protection measurements；
（13）High and low pressure bypath system is in good condition, and has enough capacity, and can guarantee that and put at any time；
（14）Main-generator breaker and degaussing switch are jumped and are closed normally；
（15）Station-service DC power-supply system is in serviceable condition, and failure power system is infallible through certification test.Diesel oil
Electromotor is in serviceable condition, requires through emergency start agreement with experimental；
（16）Station service fast switching device is working properly；
（17）The each bear vibration of unit is in acceptability limit；
（18）External electrical network normal operation, no outer net off-grid phenomenon；Described FCB actuating signal occurrence time each point of group be
The control process of system, the whole control process controlling including subsystem following included in this system：
（1）Boiler Pcv valve should be when FCB actuating signal occurs, and main steam pressure is higher than certain certain value and main steaming
Steam flow amount is chain more than during certain certain value to be opened, and chain closing after main steam pressure drops to certain certain value, if system has
Two and during above Pcv valve, can open when pressure is high, when pressure falls after rise, when each two valve should be spaced several seconds simultaneously
Between close（The concrete time is depending on different system）, be so conducive to the stable operation of boiler water system；
（2）When FCB actuating signal occurs, fuel quantity reduces to the 50% about of nominal fuel amount immediately, typically for fuel master control
It is to be realized by stopping coal pulverizer, as stopping several coal pulverizers, depending on different systems, principle is exactly that fuel quantity is kept to
Boiler minimum steady fires load, when stopping coal pulverizer, should be spaced about 5 seconds between two coal pulverizers simultaneously, remaining fortune
The coal pulverizer of row is able to maintain that minimum steady combustion load is just permissible, so can stable operation, be started without oil reservoir combustion-supporting again；
（3）FCB actuating signal triggers RB actuating signal after occurring immediately, during this period, the giving of the remaining coal pulverizer running
Coal amount keeps constant, and actuating signal switchs to normal regulating after disappearing again, runs in the quick shutdown protection of coal pulverizer simultaneously
" feeder confirm run after coal pulverizer primary air flow be less than certain certain value, after time delay certain time shut down " this, prolong
When the time should be appropriate prolongation, depending on concrete system, about 10 seconds about, so ensure that stablizing of pulverized coal preparation system
Run；
（4）After FCB actuating signal occurs, for the safety of system, MFT can be triggered when meeting some requirements and move
Make signal, after any one of three kinds of conditions meet below, all will trigger MFT signal, a：The situation that FCB does not put into
Under, if during steam turbine tripping operation, unit load is more than the operating mode of certain certain value；b：When FCB actuating signal occurs, high side valve is quick
The operating mode closed；c：After FCB actuating signal occurs 5 seconds, if main steam pressure is higher than certain certain value, high side valve aperture
Operating mode still less than certain certain value；
（5）Bypath system：High pressure turbine by controls main vapour pressure, and low voltage bypass controls reheater pressure, when FCB actuating signal
After generation, the pressure set points of high pressure turbine by control loop slowly decline, and final setting value maintains 62% rated pressure extremely
In the range of 67% rated pressure, and the moment that FCB actuating signal occurs, high pressure turbine by regulating valve and heavy pressure by-pass cooling water tune
Several seconds opened automatically soon by section valve（The concrete time is depending on different system）, then automatically engage automatically, high pressure turbine by is adjusted
Valve controls main steam pressure, and Desuperheating water regulating valve controls main steam temperature, in the moment of FCB action, in order to ensure unit safety,
If high other desuperheating water isolating door is still within closed mode or the other Desuperheating water regulating valve aperture of height less than 5%, high other regulation
Valve protection after several seconds of time delay is closed；, after the generation of FCB actuating signal, pressure set points are final for low voltage bypass regulating loop
Maintain about 50% rated pressure, and moment, low voltage bypass regulating valve and the low voltage bypass desuperheat that FCB actuating signal occurs
Several seconds left automatically soon by water regulating valve（The concrete time is depending on different system）, then low voltage bypass control valve opening be down to
60%, then start to adjust reheater pressure, low-pressure by pass temperature-lowering water governor valve control temperature, in FCB action moment, in order to protect
Card unit safety, if low other desuperheating water isolating door is still within closed mode or low other Desuperheating water regulating valve aperture is less than 5%
When, low voltage bypass regulating valve is closed in protection after time delay in several seconds；
（6）Attemperation water system：When FCB actuating signal occurs, one-level desuperheating water, two grades of desuperheating waters and reheater desuperheating water are adjusted
Section valve is automatically switched off certain time, adjusts Stream temperature degree at different levels according to setting curve afterwards；
（7）When FCB actuating signal occurs, boiler master is cut to Non-follow control, and unit exits coordinated control mode；Vapour simultaneously
Owner controls positive closing speed regulation valve of steam turbine certain time, and the concrete time, depending on different system, so can quickly drop
Underload, is conducive to the stable of unit main steam pressure it is also possible to shorten the time of origin of RB actuating signal；
（8）When FCB actuating signal occurs, the overflow regulating valve of gland seal system should be closed, and auxiliary vapour is adjusted to axle envelope
Valve and cold should be in auto state to axle envelope regulating valve again, so ensure that stablizing of gland seal system；
（9）When FCB actuating signal occurs, heat adjusts door to auxiliary vapour again and keeps original position certain time, depending on concrete system,
Then normal regulating auxiliary vapour main-piping pressure；Auxiliary vapour to oxygen-eliminating device adjusts door and should put into automatic running state during this period, adjusts
Oxygen-eliminating device pressure；
（10）After FCB actuating signal occurs, water supply system occurs very great fluctuation process, if drum boiler, steam water-level
Have very great fluctuation process, if Once-through Boiler, feedwater flow occurs very great fluctuation process, this requires that feedwater control needs to keep three punchings
Amount controls, and so can preferably ensure stablizing of water system；Water supply system is must assure that in automatic running mode during this, no matter
It is electric pump or heat pump, rotating speed deviation is cut greatly manual value and should suitably be relaxed, and delay time also should suitably relax, with
When steam water-level chaser or feedwater flow chaser definite value during this period should be suitable relax a bit, false information is considered
Enter, because temporary transient false information all can in steam water-level or feedwater flow；
（11）When FCB actuating signal occurs, condenser water level adjusting door standard-sized sheet, different depending on concrete system wide-open time, greatly
About 10 seconds about, switch to normal regulating condenser water level afterwards, during this, condenser water yield has very big consumption, so
It is more beneficial for ensureing stablizing of condensate system；
（12）Disconnect for some reason in the event of external electrical network, and main-generator breaker does not have showing of tripping
As at this moment in order to ensure the safety of whole unit it is necessary to triggering FCB actuating signal, if FCB does not put into, just triggering
MFT actuating signal.Domestic unit all can have special device to judge whether external electrical network is normal, then gives generator feedback signals,
And abroad unit does not typically all have this device, so once there is outer net off-grid phenomenon, electromotor will not receive tripping operation and refer to
Order, actual load has been zero, and coordinated control system will be considered that current loads are lower than setting value, may proceed to increase fuel quantity,
Pressure and temp etc. all can increase rapidly, abnormally dangerous, and steam turbine also occurs hypervelocity phenomenon, so this guarantor must be increased
Shield；
（13）The original method of operation of other system holding is constant, and all devices all put into automatic running mode；
How described FCB actuating signal ensures unit safety, stablizes, quickly returns to and net state after occurring, bag
Include：：The state of system or the function having, the state of each system during generation before the generation of FCB actuating signal, until recover
To and net state after all subsystems during this state；After the completion of also including following FCB actuating signals, fast quick-recovery is simultaneously
The control of each subsystem during net load：
（1）If water supply system is steam feed pump, after the completion of FCB action, the vapour source of steam feed pump will be certainly
Move and switch to cold steam supply again it should be noted that observing heat pump fluctuation of speed situation, note abnormalities and take measures in time；
（2）Note observing Pcv valve state, vapour pressure Gao Shiru is not switched on, and answers manual unlocking；
（3）Coal pulverizer tripping operation after hot-air damper if not turned off, should emergency cut-off on the spot, prevent Boiler combustion；
（4）If bypath system strenuous vibration, should manual-lock height collateral line unite immediately；
（5）Once boiler extinguishment during action, answer strict implement furnace purge program, can again light a fire；
（6）Once boiler extinguishment, carry out the anticipation of boiler super high pressure accident.
Comprise operating mode：Steam turbine is tripped for some reason, cascading trip electromotor, so that unit trip, at this moment pot
Stove maintains minimum steady combustion load to continue stable operation, at any time can be according to grid requirements again grid-connected on-load；Electromotor due to
Certain reason trips, cascading trip steam turbine, so that unit trip, at this moment boiler maintenance minimum steady combustion load continues to stablize to be transported
OK, at any time can be according to grid requirements again grid-connected on-load.
Comprise special operation condition：The device of outer net whether normal work does not detect in power plant, and that is, outer net is sent out for some reason
Raw off-grid phenomenon, in the case that electromotor does not have any feedback, once outer net breaks down, for the safety and stability of unit, this
The situation of kind also triggers FCB actuating signal, if FCB does not put into, just triggering MFT actuating signal.
Advantages of the present invention and beneficial effect：
（1）Reduce manually operated, improve unit work efficiency, also improve the automaticity of system simultaneously；
（2）Reduce boiler losses, the service life of prolonged boiler；
（3）Energy saving, meets environmental protection overall consciousness；
（4）Ensure unit after shutdown of breaking down, quickly grid-connected load carrying again, is conducive to the peace of whole electrical network
Full stable operation.
The present invention can apply in any DCS control system, by this control strategy, in steam turbine tripping operation or can send out
It is ensured that boiler does not stop working under the operating mode of motor tripping operation, make unit quickly again grid-connected, saved the cost that boiler restarts,
Decrease the life consumption that boiler is caused due to start and stop, extend the service life of boiler, also improve the automatic of system simultaneously
Change degree, its Financial cost reducing and application prospect are limitless.
Brief description：
Fig. 1 is trigger condition and the reset condition of FCB actuating signal of the present invention；
Fig. 2 is the control mode of Pcv valve of the present invention；
Fig. 3 is the relation between FCB actuating signal and main protection of boiler MFT actuating signal；
Fig. 4 is the relation between FCB actuating signal and RB actuating signal.
Specific embodiment：
Embodiment 1：
When FCB actuating signal occurs, for different system, its control thought or control mode are proposed it is ensured that each point of unit
System can be run according to the mode designing, thus realize unit safety stable be transitioned into next operating mode.
Concrete control logic or control thinking are：
The whole Turbo-generator Set condition that should possess or the function having：
（1）Capital equipment no significant deficiency；Operating mechanism is flexible；Main and auxiliary machine normal operation；
（2）DCS system is working properly, and history station is working properly, and main supervisory instrument is qualified through verifying, and instruction is accurately；
（3）Unit various main protection loop ensures that 100% puts into operation, and equal safety action is reliable；
（4）Boiler combustion management system, steam turbine safety monitoring system, deaerator level and high and low plus water level protection, steam turbine
Prevent into relevant steam turbines such as water conservation, subsidiary engine interlock protections, boiler thermal technology is automatic, the device such as protect, interlock adjust data correctly,
Action is normal；
（5）TURBINE OVERSPEED PROTECTION DEVICE is good, and electricity exceeds the speed limit, mechanical overspeed protection working value should be in 110% rated speed model
In enclosing；
（6）Each section of check gate interlock action of drawing gas is correct, closes reliable rapidly, the shut-in time is qualified, and each hydrophobic valve is opened
Close good；
（7）Vacuum breaking door trip is handy, reliable in action；
（8）Grease pump, jacking(oil) pump are in good resting state；
（9）EH oil system is working properly, reliable；
（10）Boiler safety door, Pcv valve are through pass the test, reliable in action；
（11）Oxygen-eliminating device and packing standby steam source and switching facility reliability；
（12）Steam turbine prevents accurate into water protection measurements；
（13）High and low pressure bypath system is in good condition, and has enough capacity, and can guarantee that and put at any time；
（14）Main-generator breaker and degaussing switch are jumped and are closed normally；
（15）Station-service DC power-supply system is in serviceable condition, and failure power system is infallible through certification test.Diesel oil
Electromotor is in serviceable condition, requires through emergency start agreement with experimental；
（16）Station service fast switching device is working properly；
（17）The each bear vibration of unit is in acceptability limit；
The control thought of each subsystem of unit during FCB action：
（1）Boiler Pcv valve should be when FCB actuating signal occurs, and main steam pressure is higher than certain certain value and main steaming
Steam flow amount is chain more than during certain certain value to be opened, and chain closing after main steam pressure drops to certain certain value, if system has
Two and during above Pcv valve, can open when pressure is high, when pressure falls after rise, when each two valve should be spaced several seconds simultaneously
Between close（The concrete time is depending on different system）, be so conducive to the stable operation of boiler water system；
（2）When FCB actuating signal occurs, fuel quantity reduces to the 50% about of nominal fuel amount immediately, typically for fuel master control
It is to be realized by stopping coal pulverizer, as stopping several coal pulverizers, depending on different systems, principle is exactly that fuel quantity is kept to
Boiler minimum steady fires load, when stopping coal pulverizer, should be spaced about 5 seconds between two coal pulverizers simultaneously, remaining fortune
The coal pulverizer of row is able to maintain that minimum steady combustion load is just permissible, so can stable operation, be started without oil reservoir combustion-supporting again；
（3）FCB actuating signal triggers RB actuating signal after occurring immediately, during this period, the giving of the remaining coal pulverizer running
Coal amount keeps constant, and actuating signal switchs to normal regulating after disappearing again, runs in the quick shutdown protection of coal pulverizer simultaneously
" feeder confirm run after coal pulverizer primary air flow be less than certain certain value, after time delay certain time shut down " this, prolong
When the time should be appropriate prolongation, depending on concrete system, about 10 seconds about, so ensure that stablizing of pulverized coal preparation system
Run；
（4）After FCB actuating signal occurs, for the safety of system, MFT can be triggered when meeting some requirements and move
Make signal, after any one of three kinds of conditions meet below, all will trigger MFT signal, a：The situation that FCB does not put into
Under, if during steam turbine tripping operation, unit load is more than the operating mode of certain certain value；b：When FCB actuating signal occurs, high side valve is quick
The operating mode closed；c：After FCB actuating signal occurs 5 seconds, if main steam pressure is higher than certain certain value, high side valve aperture
Operating mode still less than certain certain value；
（5）Bypath system：High pressure turbine by controls main vapour pressure, and low voltage bypass controls reheater pressure, when FCB actuating signal
After generation, the pressure set points of high pressure turbine by control loop slowly decline, and final setting value maintains 62% rated pressure extremely
In the range of 67% rated pressure, and the moment that FCB actuating signal occurs, high pressure turbine by regulating valve and heavy pressure by-pass cooling water tune
Several seconds opened automatically soon by section valve（The concrete time is depending on different system）, then automatically engage automatically, high pressure turbine by is adjusted
Valve controls main steam pressure, and Desuperheating water regulating valve controls main steam temperature, in the moment of FCB action, in order to ensure unit safety,
If high other desuperheating water isolating door is still within closed mode or the other Desuperheating water regulating valve aperture of height less than 5%, high other regulation
Valve protection after several seconds of time delay is closed；, after the generation of FCB actuating signal, pressure set points are final for low voltage bypass regulating loop
Maintain about 50% rated pressure, and moment, low voltage bypass regulating valve and the low voltage bypass desuperheat that FCB actuating signal occurs
Several seconds left automatically soon by water regulating valve（The concrete time is depending on different system）, then low voltage bypass control valve opening be down to
60%, then start to adjust reheater pressure, low-pressure by pass temperature-lowering water governor valve control temperature, in FCB action moment, in order to protect
Card unit safety, if low other desuperheating water isolating door is still within closed mode or low other Desuperheating water regulating valve aperture is less than 5%
When, low voltage bypass regulating valve is closed in protection after time delay in several seconds；
（6）Attemperation water system：When FCB actuating signal occurs, one-level desuperheating water, two grades of desuperheating waters and reheater desuperheating water are adjusted
Section valve is automatically switched off certain time, adjusts Stream temperature degree at different levels according to setting curve afterwards；
（7）When FCB actuating signal occurs, boiler master is cut to Non-follow control, and unit exits coordinated control mode；Vapour simultaneously
Owner controls positive closing speed regulation valve of steam turbine certain time, and the concrete time, depending on different system, so can quickly drop
Underload, is conducive to the stable of unit main steam pressure it is also possible to shorten the time of origin of RB actuating signal；
（8）When FCB actuating signal occurs, the overflow regulating valve of gland seal system should be closed, and auxiliary vapour is adjusted to axle envelope
Valve and cold should be in auto state to axle envelope regulating valve again, so ensure that stablizing of gland seal system；
（9）When FCB actuating signal occurs, heat adjusts door to auxiliary vapour again and keeps original position certain time, depending on concrete system,
Then normal regulating auxiliary vapour main-piping pressure；Auxiliary vapour to oxygen-eliminating device adjusts door and should put into automatic running state during this period, adjusts
Oxygen-eliminating device pressure；
（10）After FCB actuating signal occurs, water supply system occurs very great fluctuation process, if drum boiler, steam water-level
Have very great fluctuation process, if Once-through Boiler, feedwater flow occurs very great fluctuation process, this requires that feedwater control needs to keep three punchings
Amount controls, and so can preferably ensure stablizing of water system；Water supply system is must assure that in automatic running mode during this, no matter
It is electric pump or heat pump, rotating speed deviation is cut greatly manual value and should suitably be relaxed, and delay time also should suitably relax, with
When steam water-level chaser or feedwater flow chaser definite value during this period should be suitable relax a bit, false information is considered
Enter, because temporary transient false information all can in steam water-level or feedwater flow；
（11）When FCB actuating signal occurs, condenser water level adjusting door standard-sized sheet, different depending on concrete system wide-open time, greatly
About 10 seconds about, switch to normal regulating condenser water level afterwards, during this, condenser water yield has very big consumption, so
It is more beneficial for ensureing stablizing of condensate system；
（12）Disconnect for some reason in the event of external electrical network, and main-generator breaker does not have showing of tripping
As at this moment in order to ensure the safety of whole unit it is necessary to triggering FCB actuating signal, if FCB does not put into, just triggering
MFT actuating signal.Domestic unit all can have special device to judge whether external electrical network is normal, then gives generator feedback signals,
And abroad unit does not typically all have this device, so once there is outer net off-grid phenomenon, electromotor will not receive tripping operation and refer to
Order, actual load has been zero, and coordinated control system will be considered that current loads are lower than setting value, may proceed to increase fuel quantity,
Pressure and temp etc. all can increase rapidly, abnormally dangerous, and steam turbine also occurs hypervelocity phenomenon, so this guarantor must be increased
Shield；
（13）The original method of operation of other system holding is constant, and all devices all put into automatic running mode.
After the completion of FCB actuating signal, the control thought of each subsystem during the grid-connected load of fast quick-recovery：
（1）If water supply system is steam feed pump, after the completion of FCB action, the vapour source of steam feed pump will be certainly
Move and switch to cold steam supply again it should be noted that observing heat pump fluctuation of speed situation, note abnormalities and take measures in time；
（2）Note observing Pcv valve state, vapour pressure Gao Shiru is not switched on, and answers manual unlocking；
（3）Coal pulverizer tripping operation after hot-air damper if not turned off, should emergency cut-off on the spot, prevent Boiler combustion；
（4）If bypath system strenuous vibration, should manual-lock height collateral line unite immediately；
（5）Once boiler extinguishment during action, answer strict implement furnace purge program, can again light a fire；
（6）Once boiler extinguishment, carry out the anticipation of boiler super high pressure accident.
Described application system includes：All DCS control systems, for example：State electricity intelligence depth control system, ABB control system,
Hollysys's control system, FOXBRO control system, Siemens control system etc.；
Range of application comprises all kinds unit：Such as 300,000 drum boilers, 1,000,000 Once-through Boilers, 600,000 drum boilers etc..
Accompanying drawing includes Fig. 1, Fig. 2, Fig. 3 and Fig. 4.Below in conjunction with the accompanying drawings and specific embodiment to the present invention make detailed further
Thin explanation.
This product is mainly by the various status signals of equipment are defined as various different input signals, these inputs
Signal through the reorganization of the logic such as "AND", "or", " non-", according to control thought or the control logic of design, by output
Signal sends instruction, realizes various different, the complicated action relationships between equipment so that system have various different
Function.In use it is only necessary to input signal is renamed according to the name of existing system, various relations are used simultaneously
The logical symbol that existing system provides shows just permissible.
As shown in figure 1, the mainly trigger condition of explanation FCB actuating signal and reset condition, especially it is to be noted that：If electric
Factory can not judge whether outer net is normal, prevents outer net suspension from causing the accident, it is whether normal that trigger condition must increase an outer net
Protection, can be judged with turbine speed, if unit and net state, and when steam turbine reaches OPC rotating speed, just trigger
FCB actuating signal, if FCB does not put into, just triggering MFT actuating signal；If power plant has and judges whether outer net normally fills
Put, when can give generator feedback signals, trigger condition just need not increase this and protect.
Fig. 2 is mainly the course of action controlling Pcv valve, and after FCB occurs, bypass can quickly be opened, and lays down pressure, but by
It is not 100% capacity in bypass, so when pressure is higher than certain certain value, Pcv valve should automatically open up, and is less than when pressure falls back to
During certain certain value, Pcv valve is being automatically switched off, the safety of such guarantee unit.
Fig. 3 is mainly described the relation between FCB actuating signal and MFT actuating signal, that is,：When FCB protection puts into, if
FCB action will not trigger MFT action, if FCB does not put into, will trigger MFT action, so can protect after action
Card unit under any operating mode can safety and stability, and the most low consumed operation can be accomplished.
Fig. 4 is mainly described the relation between FCB actuating signal and RB actuating signal, if load is more than certain certain value
Words, will trigger RB actuating signal after FCB triggering, so be more beneficial for the stability of unit fast cutback and unit.
Bypass Control System, gland seal system, Attemperation water system, water supply system, condensate system, fuel management system, auxiliary
Vapour system and pulverized coal preparation system is helped to be controlled according to the control thought proposing in invention, after FCB actuating signal completes, bag
Include these systems and other system continues to stable operation according to original mode.
After steam turbine tripping operation intertripping electromotor or generator tripping intertripping steam turbine, triggering FCB stops
Machine not blowing out actuating signal, after FCB action, boiler triggers RB action, and at this moment boiler master is cut to manually, and combustion rate is down to automatically
50% Coal-fired capacity, coal pulverizer retains the number of units being able to maintain that minimum steady fires load, and the coal pulverizer of tripping operation is spaced 5s excision successively；When
When main steam pressure is higher than certain value, boiler ERV valve（Pcv valve）Automatically open up simultaneously, after main vapour pressure is less than certain value, ERV
Valve（Pcv valve）It is spaced several seconds to close successively；The automatic Close All of desuperheating water pitch；High pressure turbine by controls main vapour pressure,
Pressure definite value slowly declines, and the final setting value of pressure is high pressure turbine by pressure-regulating valve and desuperheat about 60% nominal steam pressure
Water valve leaves several seconds automatically soon, and the concrete time, depending on different system, then automatically engages automatically, adjusts pressure and temperature；Low
Lateral pressure adjusts door and low other desuperheat water valve is opened several seconds automatically soon, and the concrete time, then reduced pressure in low side depending on different system
Valve is down to 60%, starts afterwards to adjust temperature, pressure.Continue to run with after parameter stability, at this moment can be weighed at any time according to grid requirements
Newly grid-connected on-load.
Claims (3)
1. the integrated control method of the shutdown not blowing out function of power plant FCB is it is characterised in that main include：FCB actuating signal
Trigger condition and reset condition, the control process of FCB actuating signal occurrence time each subsystem of group, FCB actuating signal occurs
How to ensure unit safety later, stablize, quickly return to and net state；
The trigger condition of described FCB actuating signal and reset condition, including any one or a few in following terms and conditions：
（1）Capital equipment no significant deficiency；Operating mechanism is flexible；Main and auxiliary machine normal operation；
（2）DCS system is working properly, and history station is working properly, and main supervisory instrument is qualified through verifying, and instruction is accurately；
（3）Unit various main protection loop ensures that 100% puts into operation, and equal safety action is reliable；
（4）Boiler combustion management system, steam turbine safety monitoring system, deaerator level and high and low plus water level protection, steam turbine prevent
Enter water conservation, subsidiary engine interlock protection these about steam turbine, boiler thermal technology automatically, protection, interlock data of adjusting correct, action
Normally；
（5）TURBINE OVERSPEED PROTECTION DEVICE is good, and electricity exceeds the speed limit, mechanical overspeed protection working value should be in 110% nominal speed range
Interior；
（6）Each section of check gate interlock action of drawing gas is correct, closes reliable rapidly, the shut-in time is qualified, and each hydrophobic valve switch is good
Good；
（7）Vacuum breaking door trip is handy, reliable in action；
（8）Grease pump, jacking(oil) pump are in good resting state；
（9）EH oil system is working properly, reliable；
（10）Boiler safety door, Pcv valve are through pass the test, reliable in action；
（11）Oxygen-eliminating device and packing standby steam source and switching facility reliability；
（12）Steam turbine prevents accurate into water protection measurements；
（13）High and low pressure bypath system is in good condition, and has enough capacity, and can guarantee that and put at any time；
（14）Main-generator breaker and degaussing switch are jumped and are closed normally；
（15）Station-service DC power-supply system is in serviceable condition, and failure power system is infallible through certification test, diesel generation
Machine is in serviceable condition, requires through emergency start agreement with experimental；
（16）Station service fast switching device is working properly；
（17）The each bear vibration of unit is in acceptability limit；
（18）External electrical network normal operation, no outer net off-grid phenomenon；
The control process of described FCB actuating signal occurrence time each subsystem of group, including following point included in this system be
Whole control process that system controls：
（1）Boiler Pcv valve should be when FCB actuating signal occurs, and main steam pressure is higher than certain certain value and main steam flow
Amount is chain more than during certain certain value to be opened, and chain closing after main steam pressure drops to certain certain value, if system has two
And during above Pcv valve, open when pressure is high, when pressure falls after rise, each two valve should be spaced several seconds and close, tool. simultaneously
The body time, depending on different system, is so conducive to the stable operation of boiler water system；
（2）When FCB actuating signal occurs, fuel quantity reduces to the 50% about of nominal fuel amount immediately, usually logical for fuel master control
Cross and stop what coal pulverizer was realized, as stopping several coal pulverizers, depending on different systems, principle is exactly that fuel quantity is kept to boiler
Minimum steady fires load, when stopping coal pulverizer, should be spaced about 5 seconds between two coal pulverizers simultaneously, remaining operation
Coal pulverizer is able to maintain that minimum steady combustion load is just permissible, so can stable operation, be started without oil reservoir combustion-supporting again；
（3）FCB actuating signal triggers RB actuating signal after occurring immediately, during this period, the coal-supplying amount of the remaining coal pulverizer running
Keep constant, actuating signal disappear after switch to normal regulating again, simultaneously run coal pulverizer quick shutdown protection in " to coal
After machine commencement of commercial operation, the primary air flow of coal pulverizer is less than certain certain value, shuts down after time delay certain time " this, delay time
Prolongation that should be appropriate, depending on concrete system, 10 seconds about, so ensure that the stable operation of pulverized coal preparation system；
（4）After FCB actuating signal occurs, for the safety of system, MFT action letter can be triggered when meeting some requirements
Number, after any one of three kinds of conditions meet below, all will trigger MFT signal, a：In the case that FCB does not put into,
If during steam turbine tripping operation, unit load is more than the operating mode of certain certain value；b：When FCB actuating signal occurs, high side valve quickly closes
The operating mode closed；c：After FCB actuating signal occurs 5 seconds, if main steam pressure is higher than certain certain value, high side valve aperture is still
So it is less than the operating mode of certain certain value；
（5）Bypath system：High pressure turbine by controls main vapour pressure, and low voltage bypass controls reheater pressure, when FCB actuating signal occurs
After, the pressure set points of high pressure turbine by control loop slowly decline, and final setting value maintains 62% rated pressure to 67% volume
In the range of constant-pressure, and the moment that FCB actuating signal occurs, high pressure turbine by regulating valve and heavy pressure by-pass cooling water regulating valve from
Move and open several seconds soon, the concrete time, depending on different system, then automatically engages, high pressure turbine by governor valve control main steam
Pressure, Desuperheating water regulating valve controls main steam temperature, in the moment of FCB action, in order to ensure unit safety, if high other desuperheat
When water segregation door is still within closed mode or high other Desuperheating water regulating valve aperture less than 5%, high other regulating valve was in several seconds of time delay
After clock, protection is closed；After the generation of FCB actuating signal, pressure set points finally maintain 50% volume to low voltage bypass regulating loop
About constant-pressure, and FCB actuating signal occur moment, low voltage bypass regulating valve and low-pressure by pass temperature-lowering water regulating valve automatic
Open several seconds soon, the concrete time, then low voltage bypass control valve opening was down to 60%, then starts depending on different system
Adjust reheater pressure, low-pressure by pass temperature-lowering water governor valve control temperature, in FCB action moment, in order to ensure unit safety, such as
When really low other desuperheating water isolating door is still within closed mode or low other Desuperheating water regulating valve aperture less than 5%, low voltage bypass is adjusted
Section valve cuts out in protection after time delay in several seconds；
（6）Attemperation water system：When FCB actuating signal occurs, one-level desuperheating water, two grades of desuperheating waters and reheater Desuperheating water regulating valve
It is automatically switched off certain time, afterwards Stream temperature degree at different levels are adjusted according to setting curve；
（7）When FCB actuating signal occurs, boiler master is cut to Non-follow control, and unit exits coordinated control mode；Steam turbine master simultaneously
Control positive closing speed regulation valve of steam turbine certain time, the concrete time, depending on different system, so can quickly reduce negative
Lotus, is conducive to the stable of unit main steam pressure it is also possible to shorten the time of origin of RB actuating signal；
（8）When FCB actuating signal occurs, the overflow regulating valve of gland seal system should be closed, and auxiliary vapour to axle envelope regulating valve and
Cold should be in auto state to axle envelope regulating valve again, so ensure that stablizing of gland seal system；
（9）When FCB actuating signal occurs, heat adjusts door to auxiliary vapour again and keeps original position certain time, depending on concrete system, then
Normal regulating auxiliary vapour main-piping pressure；Auxiliary vapour to oxygen-eliminating device adjusts door and should put into automatic running state during this period, adjusts deoxygenation
Device pressure；
（10）After FCB actuating signal occurs, water supply system occurs very great fluctuation process, if drum boiler, steam water-level has
Very great fluctuation process, if Once-through Boiler, feedwater flow occurs very great fluctuation process, and this requires that feedwater control needs to keep three impulses control
System, so can preferably ensure stablizing of water system；Must assure that water supply system in automatic running mode, whether electricity during this
Pump or heat pump, rotating speed deviation is cut greatly manual value and should suitably be relaxed, and delay time also should suitably relax, simultaneously vapour
The definite value of bag water level chaser or feedwater flow chaser during this period should be suitable relax a bit, false information is taken into account
Go, because temporary transient false information all can in steam water-level or feedwater flow；
（11）When FCB actuating signal occurs, condenser water level adjusting door standard-sized sheet, different depending on concrete system wide-open time, 10 seconds
Left and right, switchs to normal regulating condenser water level, during this, condenser water yield has very big consumption, is so more beneficial for afterwards
Ensure stablizing of condensate system；
（12）Disconnect for some reason in the event of external electrical network, and main-generator breaker does not have the phenomenon of tripping, this
When in order to ensure the safety of whole unit it is necessary to triggering FCB actuating signal, if FCB does not put into, just triggering MFT moves
Make signal；Domestic unit all can have special device to judge whether external electrical network is normal, then gives generator feedback signals, and external
Unit does not typically all have this device, so once there is outer net off-grid phenomenon, electromotor will not receive trip command, actual
Load has been zero, and coordinated control system will be considered that current loads are lower than setting value, may proceed to increase fuel quantity, pressure and temp
Will increase rapidly, abnormally dangerous, and steam turbine also occurs hypervelocity phenomenon, so this protection must be increased；
（13）The original method of operation of other system holding is constant, and all devices all put into automatic running mode；
How described FCB actuating signal ensures unit safety, stablizes, quickly returns to and net state after occurring, including：
The state of system or the function having, the state of each system during generation before the generation of FCB actuating signal, until return to simultaneously
The state of all subsystems during this after net state；After the completion of also including following FCB actuating signals, fast quick-recovery is grid-connected negative
The control of each subsystem during lotus：
（1）If water supply system is steam feed pump, after the completion of FCB action, the vapour source of steam feed pump will be cut automatically
Being changed to cold steam supply again it should be noted that observing heat pump fluctuation of speed situation, noting abnormalities and taking measures in time；
（2）Note observing Pcv valve state, vapour pressure Gao Shiru is not switched on, and answers manual unlocking；
（3）Coal pulverizer tripping operation after hot-air damper if not turned off, should emergency cut-off on the spot, prevent Boiler combustion；
（4）If bypath system strenuous vibration, should manual-lock height collateral line unite immediately；
（5）Once boiler extinguishment during action, answer strict implement furnace purge program, can again light a fire；
（6）Once boiler extinguishment, carry out the anticipation of boiler super high pressure accident.
2. according to claim 1 the integrated control method of the shutdown not blowing out function of power plant FCB it is characterised in that comprising
Operating mode：Steam turbine is tripped for some reason, cascading trip electromotor, so that unit trip, at this moment boiler maintenance minimum steady
Combustion load continues stable operation, at any time can be according to grid requirements again grid-connected on-load；Electromotor trips for some reason,
Cascading trip steam turbine, so that unit trip, at this moment boiler maintenance minimum steady combustion load continuation stable operation, at any time can root
According to grid requirements again grid-connected on-load.
3. according to claim 1 the integrated control method of the shutdown not blowing out function of power plant FCB it is characterised in that comprising
Special operation condition：The device of outer net whether normal work does not detect in power plant, and that is, outer net occurs off-grid phenomenon for some reason, sends out
In the case that motor does not have any feedback, once outer net breaks down, for the safety and stability of unit, this situation also triggers
FCB actuating signal, if FCB does not put into, just triggering MFT actuating signal.
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