CN104179704B - Method and the device of a kind of booster fan runback RB of power plant - Google Patents

Method and the device of a kind of booster fan runback RB of power plant Download PDF

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Publication number
CN104179704B
CN104179704B CN201310189246.3A CN201310189246A CN104179704B CN 104179704 B CN104179704 B CN 104179704B CN 201310189246 A CN201310189246 A CN 201310189246A CN 104179704 B CN104179704 B CN 104179704B
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China
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booster fan
unit
load
fan
booster
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CN201310189246.3A
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Chinese (zh)
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CN104179704A (en
Inventor
康静秋
李卫华
解明
刘磊
张海富
顾强
肖军政
高礼
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国家电网公司
华北电力科学研究院有限责任公司
陕西国华锦界能源有限责任公司
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Priority to CN201310189246.3A priority Critical patent/CN104179704B/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01KSTEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00General layout or general methods of operation of complete plants
    • F01K13/02Controlling, e.g. stopping or starting

Abstract

The embodiment of the present invention provides method and the device of a kind of booster fan runback RB of power plant, and the method comprises: under the operating mode breaking down at unit booster fan, trigger booster fan RB; The load of unit is down to current operational outfit and is allowed the corresponding preset booster fan RB target load of exerting oneself; utilize booster fan movable vane standard-sized sheet in the moment of booster fan tripping operation simultaneously; set up the passage of a flue gas flow, to avoid the unplanned stoppage in transit of unit, guarantee the operation of unit. The embodiment of the present invention is by the new booster fan RB function of design, desulfurization main equipment and host groups equipment are controlled and safeguarded according to same standard and requirement, in the time of booster fan fault, avoid the negative effect bringing to coal fired power generation unit operation after the dismounting of desulfurization by-pass damper and flue shutoff, realize that desulfurizer is synchronizeed with boiler main frame, long-term, stable operation, greatly reduce the generation of the unplanned stoppage in transit of unit causing due to booster fan fault.

Description

Method and the device of a kind of booster fan runback RB of power plant
Technical field
The present invention relates to power technology field, relate in particular to the method for booster fan runback RB of power plant a kind ofAnd device.
Background technology
Require to implement refinement along with Chinese Ministry of Environmental Protection " 12 " reduces discharging, continue to advance total amount of pollutant emission reduction work, for reducingThe discharge of pollutant, improves coal fired power generation unit synthesis desulfurating denitration efficiency, requires Desulphurization for Coal-fired Power Plant system flue duct bypassImplement thorough shutoff, therefore desulfurization duct bypass shutoff work is imperative for each genco. Simultaneously this year Chinese Ministry of Environmental Protection andDeadline of having emphasized Desulphurization for Coal-fired Power Plant bypass shutoff repeatedly in each file of each Bureau of Environmental Protection of Shanxi Province, coal-burning power plant's conductEmphasis reduces discharging unit and faces direct pressure.
For the domestic wet desulfurization system with spray column generally adopting, wind and smoke system after desulfurization bypass shutoff transformationThe structure of system can be divided into and retain booster fan and cancel these two kinds of booster fan dilatation air-introduced machines, and below Main Analysis is suitable hereinFor the type with booster fan.
Desulfurization bypass flue is actually an important passage that forms main frame and desulfurization island operation, when former desulphurization systemWith gas bypass time, can maintain host machine part by opening bypass under varying duty significantly and the extreme failure conditionNormal operation, realizes the decoupling zero in desulfurization island and main frame operation, at utmost reduces the impact of desulfurization island fault on main frame; DesulfurizationAfter bypass flue shutoff, desulfurizer and host groups become the production system of series connection, to the very important burner hearth of Host Security operationNegative pressure not only relies on the air-introduced machine that send of main frame to control, and largely depends on and the strong wind that send air-introduced machine-booster fan to formThe control characteristic of cigarette system, thus the non-number of times stopping of unit greatly increased. With each power plant desulfurization system of Guo Hua genco of ShenhuaSystem fault analysis is example, and statistics show: within nearly 5 years, open totally 190 because desulphurization system fault causes by-pass damperInferior; Wherein booster fan fault 69 times, accounts for 36.3%; GGH (GasGasHeater, flue gas heat-exchange unit) fault causes bypass gearPlate is opened 75 times totally, accounts for 39.5%; Other equipment faults of desulphurization system cause by-pass damper unlatching totally 26 times, account for 13.7%; BypassBaffle plate loss signal 13 times, accounts for 6.8%; DCS (DistributedControlSystems, scattered control system) fault 4 times,Account for 2.1%; Absorption tower line with rubber comes off 3 times, accounts for 1.6%.
By the analysis of statistical results of power plant in China of state system is found, because desulphurization system booster fan fault causes de-The ratio that sulphur system is stopped transport is relatively high, reaches 36.3%. According to existing scheme, these No. 69 booster fan faults all can causeUnit MFT (MainFuelTrip, main burning tripping operation), thus the unplanned stoppage in transit number of times of unit is increased greatly. Unit non-Planned outage is to be an important indicator in the management of power plant safety reliability index for power plant, and unplanned stoppage in transit is peaceFull problem, is also economic problems, and electric quantity loss, equipment rehabilitation expense, fuel consume, equipment that unplanned stoppage in transit brings use the longevityLife loss etc. all can cause loss economically to Generation Side, for the safe operation management of five large electricity power groups, and electricityThe unplanned stoppage in transit of brand-name computer group all must be examined to responsibility employee from level of factory leader. With regard to grid side, electrical network entersIn the large large unit epoch of electrical network, large unit operation reliability height directly has influence on the safe and stable operation of electrical network, improves large unitOperational reliability level be the electrical network net both sides' of factory common objective, the stopping suddenly of especially newly-built 600MW or 1000MW unitMachine, can cause the frequency fluctuation of unit place electrical network, affects the safety and stability of electrical network.
According to " 12 " planning of country, national environmental protection portion file requires just to issue to cancelling desulfurization duct bypass,Therefore experimental stage is all being groped by company of each electricity power group, the domestic system reform experience not also being shaped. Under this background,If the common way of each genco is directly to trigger boiler MFT after booster fan disorderly closedown, directly blowing out is shut down. Cancel de-After sulphur bypass, the flue gas of boiler must pass through from desulphurization absorption tower system. Therefore anyly can cause that desulphurization system is out of serviceFactor, all can cause boiler unit tripping. These are because have: dust collector efficiency is poor, deduster is out of service, booster fan is protectedProtect tripping operation, slurry circulating pump full cut-off. Taking the modification scheme of power plant of Datang electricity power group as example:
In " China Datang Power Group Corporation's desulfurization fume bypass shutoff (or dismounting) management guidance suggestion (trying) ", have clear and definiteRequire: " (one) desulphurization system trips into main protection of boiler, triggers MFT. Desulphurization system tripping operation triggers boiler MFT condition:. superchargingBlower fan tripping operation triggers boiler MFT, excises booster fan movable vane automatic, concurrent pulse command standard-sized sheet booster fan movable vane simultaneously. " largeTang's improved logical scheme of Hu County power plant desulfurization bypass shutoff is: booster fan tripping operation interlocking send, fan trip, boilerMFT, MFT afterload 15MW, the automatic standard-sized sheet of booster fan stator, ventilates and closes after 15 minutes simultaneously.
Can find out from above-mentioned scheme, domestic existing technical scheme essence is when booster fan is because a variety of causes stopsWhen machine, single for guaranteeing main frame and burner hearth safety, directly by boiler MFT, unit main fuel trip, makes compressor emergency shutdown. AndAnd not using being considered as integrated entirety by the air and flue system that send air-introduced machine and booster fan to form after desulfurization bypass shutoffAnd design, thereby greatly increase the non-number of times stopping of unit, increase the risk of power plant and electric power netting safe running.
Realizing in process of the present invention, inventor finds that in prior art, at least there are the following problems: due to from 2010 yearsThe transformation of the desulfurization bypass flue shutoff of carrying out there is no full ripe design and case study on implementation thermal control Optimization Experience and uses for reference, also withoutCorresponding technical standard, relevant work flow process and specification support, lack long-term risk and estimate; After desulfurization transformation, need to adapt to newThe method of operation, desulphurization system importance increases suddenly, and current this area does not still have the concrete scheme of a set of booster fan RB of power plant, withAvoid the unplanned stoppage in transit of unit, guarantee the operation of unit.
Summary of the invention
The embodiment of the present invention provides method and the device of a kind of booster fan runback RB of power plant, to avoid machineThe unplanned stoppage in transit of group, guarantees the operation of unit.
On the one hand, the embodiment of the present invention provides the method for booster fan runback RB of power plant a kind of, described inMethod comprises:
Under the operating mode breaking down at unit booster fan, trigger booster fan RB;
The load of unit is down to current operational outfit and is allowed the corresponding preset booster fan RB target load of exerting oneself, withTime utilize booster fan movable vane standard-sized sheet in the moment of booster fan tripping operation, set up the passage of a flue gas flow, to avoid unitUnplanned stoppage in transit, guarantees the operation of unit.
Optionally, in an embodiment of the present invention, under the described operating mode breaking down at unit booster fan, trigger superchargingBlower fan RB, comprising: in the time that unit booster fan breaks down tripping operation and when unit cooperative system has dropped into stove with machine state, touchSending out booster fan RB occurs.
Optionally, in an embodiment of the present invention, described unit booster fan breaks down to trip and is tripped by booster fanSignal three is got two judgements.
Optionally, in an embodiment of the present invention, the described load by unit is down to current operational outfit and is allowed to exert oneselfCorresponding preset booster fan RB target load utilizes booster fan movable vane standard-sized sheet in the moment of booster fan tripping operation simultaneously, buildsThe passage of a vertical flue gas flow, to avoid the unplanned stoppage in transit of unit, guarantees the operation of unit, comprising: by unit cooperative systemBe switched to machine following state by stove with machine state, regulate movable vane to open to standard-sized sheet position booster fan with speed limit not simultaneously; Will be pre-Put the load loop that booster fan RB target load is placed to coherent system, and by corresponding preset booster fan RB target loadFuel quantity is delivered to boiler master as fuel command; By according to the number of units of the coal pulverizer of unit operation, the coal pulverizer that tripsStep, jumps mill principle and is: jump the superiors mills without time delay, with the reality of interval 5S trip other coal pulverizer of order from top to bottomRetain eventually three coal pulverizer operations of the bottom, and the instruction of jumping mill is delivered to Boiler Furnace Safeguard Supervisory System FSSS system.
Optionally, in an embodiment of the present invention, described method also comprises: after booster fan RB triggers, if unit is realBorder load meets and is less than preset difference or operations staff's hand-reset with preset booster fan RB target load difference, triggersBooster fan RB involution: the startup load point that the load of unit is dropped to preset booster fan is restarted booster fan below.
On the other hand, the embodiment of the present invention provides the device of a kind of booster fan runback RB of power plant, instituteStating device comprises:
Trigger element, under the operating mode breaking down at unit booster fan, triggers booster fan RB;
DCS control module, allows for the load of unit being down to current operational outfit the corresponding preset supercharging of exerting oneselfBlower fan RB target load, simultaneously utilize booster fan movable vane standard-sized sheet in the moment of booster fan tripping operation, sets up a flue gas flowPassage, to avoid the unplanned stoppage in transit of unit, guarantees the operation of unit.
Optionally, in an embodiment of the present invention, the work of described trigger element for breaking down at unit booster fanUnder condition, trigger booster fan RB, comprising: in the time that unit booster fan breaks down tripping operation and unit cooperative system dropped into stove and followedWhen machine state, trigger booster fan RB and occur.
Optionally, in an embodiment of the present invention, described unit booster fan breaks down to trip and is tripped by booster fanSignal three is got two judgements.
Optionally, in an embodiment of the present invention, described DCS control module, specifically for the load of unit is down toCurrent operational outfit allows the corresponding preset booster fan RB target load of exerting oneself, and utilizes in the moment of booster fan tripping operation simultaneouslyBooster fan movable vane standard-sized sheet, sets up the passage of a flue gas flow, to avoid the unplanned stoppage in transit of unit, guarantees the operation of unit,Comprise: unit cooperative system is switched to machine following state by stove with machine state, booster fan is regulated moving with speed limit not simultaneouslyLeaf opens to standard-sized sheet position; Preset booster fan RB target load is placed to the load loop of coherent system, and by preset superchargingThe fuel quantity that blower fan RB target load is corresponding is delivered to boiler master as fuel command; By according to the platform of the coal pulverizer of unit operationNumber, the step of the coal pulverizer that trips, jumping mill principle is: jump the superiors' mill without time delay, suitable from top to bottom with the reality of interval 5SOrder trips, and other coal pulverizer is also final retains three coal pulverizers operations of the bottom, and the instruction of jumping mill is delivered to boiler furnace and supervise safelyControl system FSSS system.
Optionally, in an embodiment of the present invention, described trigger element, also for after triggering as booster fan RB, if machineGroup actual load and preset booster fan RB target load difference are satisfied is less than preset difference or operations staff's hand-reset,Trigger booster fan RB involution; Described DCS control module, also bears for the startup that the load of unit is dropped to preset booster fanBelow lotus point, restart booster fan.
Technique scheme has following beneficial effect: because adopt under the operating mode breaking down at unit booster fan,Trigger booster fan RB; The load of unit is down to current operational outfit and is allowed the corresponding preset booster fan RB target of exerting oneselfLoad utilizes booster fan movable vane standard-sized sheet in the moment of booster fan tripping operation simultaneously, sets up the passage of a flue gas flow, to avoidThe unplanned stoppage in transit of unit, guarantees the technological means of the operation of unit, so reached following technique effect: increase by designThe testing program of obtaining of the key parameter of the overall plan of pressure fan RB and the success of the test of guaranteeing, has filled up domestic supercharging windMachine is as the blank of the RB test of Important Auxiliary equipment. By designing new booster fan RB function, by desulfurization main equipment and host groupsEquipment is controlled and safeguards according to same standard and requirement, in the time of booster fan fault, avoid desulfurization by-pass damper remove andAfter flue shutoff, give the negative effect that brings of coal fired power generation unit operation, realize desulfurizer and synchronize with boiler main frame, for a long time, surelyFixed operation, greatly reduces the generation of the unplanned stoppage in transit of unit causing due to booster fan fault. For ensureing unit safetyOperation, the unplanned stoppage in transit number of times of minimizing unit have decisive meaning, the unit safety to Power Plant Side and the power supply of grid sideSafety all plays important effect.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existingHave the accompanying drawing of required use in technical description to be briefly described, apparently, the accompanying drawing in the following describes is only thisSome embodiment of invention, for those of ordinary skill in the art, not paying under the prerequisite of creative work, all rightObtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the method flow diagram of the booster fan runback RB of a kind of power plant of the embodiment of the present invention;
Fig. 2 is the apparatus structure schematic diagram of the booster fan runback RB of a kind of power plant of the embodiment of the present invention;
Fig. 3 is the air and flue system schematic diagram of application example of the present invention power plant with booster fan;
Fig. 4 is application example booster fan RB logical schematic of the present invention;
Fig. 5 is tripping operation coal pulverizer step and the time logical schematic of application example booster fan RB of the present invention;
Fig. 6 is the Process Design schematic diagram that again starts booster fan after application example booster fan RB of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, completeDescribe, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment wholely. Based onEmbodiment in the present invention, those of ordinary skill in the art are not making obtain under creative work prerequisite every otherEmbodiment, belongs to the scope of protection of the invention.
The embodiment of the present invention provides method and the device of a kind of booster fan runback RB of power plant, to avoid machineThe unplanned stoppage in transit of group, guarantees the operation of unit.
As shown in Figure 1, be the method flow diagram of the booster fan runback RB of a kind of power plant of the embodiment of the present invention,Described method comprises:
101,, under the operating mode breaking down at unit booster fan, trigger booster fan RB;
102, the load of unit is down to negative with the current operational outfit corresponding preset booster fan RB target that allows to exert oneselfLotus utilizes booster fan movable vane standard-sized sheet in the moment of booster fan tripping operation simultaneously, sets up the passage of a flue gas flow, to avoid machineThe unplanned stoppage in transit of group, guarantees the operation of unit.
Optionally, under the described operating mode breaking down at unit booster fan, trigger booster fan RB, comprising: work as unitWhen booster fan breaks down tripping operation and when unit cooperative system has dropped into stove with machine state, trigger booster fan RB and occur.
Optionally, the tripping operation of breaking down of described unit booster fan is got two judgements by booster fan trip signal three.
Optionally, the described load by unit is down to current operational outfit and is allowed the corresponding preset booster fan RB that exerts oneselfTarget load utilizes booster fan movable vane standard-sized sheet in the moment of booster fan tripping operation simultaneously, sets up the passage of a flue gas flow, withAvoid the unplanned stoppage in transit of unit, guarantee the operation of unit, comprising: unit cooperative system is switched to machine by stove with machine state and followsWith state, simultaneously regulate movable vane to open to standard-sized sheet position booster fan with speed limit not; Preset booster fan RB target load is putEnter the load loop to coherent system, and fuel quantity corresponding to preset booster fan RB target load delivered to as fuel commandBoiler master; By according to the number of units of the coal pulverizer of unit operation, the step of the coal pulverizer that trips, jumps mill principle and is: without time delayJump the superiors mills, with the reality of interval 5S trip other coal pulverizer final three coal pulverizers of the bottom that retain of order from top to bottomOperation, and the instruction of jumping mill is delivered to Boiler Furnace Safeguard Supervisory System FSSS system.
Optionally, described method also comprises: after booster fan RB triggers, if unit actual load and preset booster fanRB target load difference is satisfied is less than preset difference or operations staff's hand-reset, triggers booster fan RB involution: by machineThe startup load point that the load of group drops to preset booster fan is restarted booster fan below.
Corresponding to said method embodiment, as shown in Figure 2, be a kind of power plant of embodiment of the present invention booster fan auxiliary machinery faultThe apparatus structure schematic diagram of load shedding RB, described device comprises:
Trigger element 21, under the operating mode breaking down at unit booster fan, triggers booster fan RB;
DCS control module 22, allows for the load of unit being down to current operational outfit the corresponding preset increasing of exerting oneselfPressure fan RB target load utilizes booster fan movable vane standard-sized sheet in the moment of booster fan tripping operation simultaneously, sets up a flue gas flowPassage, to avoid the unplanned stoppage in transit of unit, guarantee the operation of unit.
Optionally, described trigger element 21, under the operating mode breaking down at unit booster fan, triggers booster fanRB, comprising: in the time that unit booster fan breaks down tripping operation and when unit cooperative system has dropped into stove with machine state, trigger and increasePressure fan RB occurs.
Optionally, the tripping operation of breaking down of described unit booster fan is got two judgements by booster fan trip signal three.
Optionally, described DCS control module 22, specifically for being down to the load of unit with current operational outfit and allowing outThe preset booster fan RB target load that power is corresponding utilizes booster fan movable vane standard-sized sheet in the moment of booster fan tripping operation simultaneously,Set up the passage of a flue gas flow, to avoid the unplanned stoppage in transit of unit, guarantee the operation of unit, comprising: by unit cooperative beSystem is switched to machine following state by stove with machine state, regulates movable vane to open to standard-sized sheet position booster fan with speed limit not simultaneously; WillPreset booster fan RB target load is placed to the load loop of coherent system, and by preset booster fan RB target load correspondenceFuel quantity deliver to boiler master as fuel command; By according to the number of units of the coal pulverizer of unit operation, coal pulverizer tripsStep, jump mill principle and be: jump the superiors mills without time delay, with the reality of interval 5S from top to bottom order trip other coal pulverizer alsoFinal three coal pulverizers of the bottom that retain move, and the instruction of jumping mill is delivered to Boiler Furnace Safeguard Supervisory System FSSS system.
Optionally, described trigger element 21, also for after triggering as booster fan RB, if unit actual load and preset increasingPressure fan RB target load difference is satisfied is less than preset difference or operations staff's hand-reset, triggers booster fan RB multipleReturn; Described DCS control module, also restarts supercharging below for the startup load point that the load of unit is dropped to preset booster fanBlower fan.
Embodiment of the present invention technique scheme has following beneficial effect: because adopt at unit booster fan, event occursUnder the operating mode of barrier, trigger booster fan RB: the load of unit is down to current operational outfit and is allowed the corresponding preset increasing of exerting oneselfPressure fan RB target load utilizes booster fan movable vane standard-sized sheet in the moment of booster fan tripping operation simultaneously, sets up a flue gas flowPassage, to avoid the unplanned stoppage in transit of unit, guarantee the technological means of the operation of unit, so reached following technology effectReally: the testing program of obtaining of the key parameter of the overall plan by design booster fan RB and the success of the test of guaranteeing, fill outMend the blank of domestic booster fan as the RB test of Important Auxiliary equipment. By designing new booster fan RB function, by desulfurizationMain equipment and host groups equipment are controlled and safeguard according to same standard and requirement, avoid desulfurization in the time of booster fan faultThe negative effect of bringing to coal fired power generation unit operation after by-pass damper dismounting and flue shutoff, realizes desulfurizer and boiler mainThe operation that machine is synchronous, long-term, stable, greatly reduces the generation of the unplanned stoppage in transit of unit causing due to booster fan fault. RightIn ensureing that unit safety operation, the unplanned stoppage in transit number of times of minimizing unit have decisive meaning, to the unit safety of Power Plant SideAll play important effect with the power supply safety of grid side.
Below in conjunction with application example, embodiment of the present invention such scheme is described in detail:
As shown in Figure 3, be the air and flue system schematic diagram of application example of the present invention power plant with booster fan. Due to from 2010The transformation of the desulfurization bypass flue shutoff of carrying out there is no full ripe design and case study on implementation thermal control Optimization Experience and uses for reference, also withoutCorresponding technical standard, relevant work flow process and specification support, lack long-term risk and estimate; After desulfurization transformation, need to adapt to newThe method of operation, desulphurization system importance increases suddenly. After above-mentioned transformation completes, the air and flue system of unit, combustion system characteristic occur largerVariation, need to optimize the RB of unit air and flue system (RUNBACK, runback) function comprehensively. And onStating transformation runs through from design, type selecting, transformation enforcement, opens machine operation, test, later stage assessment overall process. The conduct of RB test functionThe whole-process automatic automatic control system that does not allow manual intervention, it is the major pant item equipment of bearing generating set as sent, air inducingFast reducing unit load when arbitrary fault trip in machine, primary air fan, coal pulverizer or feed pump, and make unit load with stillAdapt and realize the control of RB process in the peak load that can bear of subsidiary engine equipment of operation. The setting of RB project is rootFixed according to difference, the difference of trip device and the difference of operating condition of machine set type, with regard to the typical case of thermal power plant unit, oneAs contain following items: feed pump RB, stove water pump RB, coal pulverizer RB, primary air fan RB, send air-introduced machine RB.
Desulphurization for Coal-fired Power Plant system flue duct bypass is implemented after thorough shutoff, for ensureing that unit is at new desulfurization air and flue systemSafe operation under service condition, the unplanned stoppage in transit number of times of minimizing unit, guarantee the unit safety of Power Plant Side and the power supply of grid sideSafety, the present invention proposes a kind of runback function (RUNBACK, be called for short RB)---booster fan of new unitRB. Booster fan RB design is exactly under the fast transient operating mode of guaranteeing to break down at unit booster fan, by variousSelection with the logic judgement under operating mode and the method for operation with control strategy, automatically completes the load of unit is down to and current fortuneRow equipment allows the corresponding target load of exerting oneself, and utilizes movable vane standard-sized sheet in the moment of booster fan tripping operation simultaneously, sets up a cigaretteThe express passway of throughput, ensures that main regulating system is working properly, maintains unit major parameter in allowed band, thereby largeReduce greatly the non-number of times that stops of unit, guarantee the safe and stable operation of unit. By designing new booster fan RB function, by desulfurizationMain equipment and host groups equipment are controlled and safeguard according to same standard and requirement, avoid desulfurization in the time of booster fan faultThe negative effect of bringing to coal fired power generation unit operation after by-pass damper dismounting and flue shutoff, realizes desulfurizer and boiler mainThe operation that machine is synchronous, long-term, stable, greatly reduces the generation of the unplanned stoppage in transit of unit causing due to booster fan fault.
Application example booster fan RB Summary on design of the present invention:
At present, the design of the typical RB function of thermal power generation unit mainly comprises: the triggering of RB signal, unit control modeSwitching, jump time consuming and step, RB target load and load shedding speed, RB involution major part. Establishing of booster fan RB functionMeter equally also comprises the content of above-mentioned six functions.
The maximum difference of application example booster fan RB of the present invention and existing other blower fans RB function is: for otherBlower fan RB, for example, when after tripping operation blower fan (A draws, A send, A primary air fan) action, (for example B draws working fan, B send, wind of BMachine) still can normally operation in self EIAJ allowed band, but the booster fan of most of units is separate unit configuration, thereforeNeed to utilize the quick standard-sized sheet of booster fan movable vane to set up unobstructed flue in booster fan moment of tripping, under this exhaust gases passesMaintain unit band portion load operation by strengthening exerting oneself of air-introduced machine, thereby avoid the unplanned stoppage in transit of unit. This kind of workUnder condition, the exhaust gas volumn that the target load of booster fan RB is determined and target load is corresponding is calculated (preventing air-introduced machine surge), is to increaseThe emphasis of pressure fan RB Functional Design.
The calculating of the definite and exhaust gas volumn that target load is corresponding of the target load of application example booster fan RB of the present inventionThe startup load of value, booster fan RB involution rear fan can carry out fan characteristic test, unit flue cold conditions on the spot (no in power plantWhen on-load), hot (when on-load) resistance test and combustion test, consider and draw according to the result of above-mentioned test. WithThe de-resistance test of unit flue cold conditions is example, can be by booster fan full cut-off and booster fan after experimental test desulfurization bypass shutoffUnder movable vane standard-sized sheet operating mode and the flue resistance situation of lower desulphurization system, the bearable load of test unit under this operating mode andBooster fan full cut-off and the lower desulphurization system of booster fan movable vane complete shut-down operating mode after flue gas flow parameter, test desulfurization bypass shutoffFlue resistance situation, test booster fan tripping operation after the minimum load point (relation of air quantity and movable vane aperture) that again starts.And the on-load ability (booster fan of unit while can be further determining again booster fan tripping operation according to hot resistance test resultTripping operation RB target load) and unit load point when booster fan startup. Shaanxi Jin Jie 600MW Site for Unit is carried out to above-mentioned examinationTest, record air-introduced machine maximum smoke gas flow bearing in the air and flue system of the exhaust gases passes formation of booster fan movable vane standard-sized sheet foundationAmount, conversion electric load of unit when hot must not be greater than 300MW. Obtain the minimum steady combustion of unit according to the combustion test of unitLoad, for 240MW, is considered working control allowance problem, and the target load of design booster fan is greater than minimum steady combustion load and is240MW is less than air and flue system bearable load 300MW, and therefore designing booster fan RB target load is 280MW. And draw increasingThe parameter value that pressure fan starts again: movable vane aperture is not more than 10%, again starts unit load and is not more than 160MW.
The overall plan of application example booster fan RB design of the present invention:
Draw the unit of an increasing configuration for 600MW and air and flue system two, can be according to the existing control function of Power Plant DCS SystemDesign and build shown in following Fig. 4 of control logic, 5 of booster fan RB: wherein, as shown in Figure 4, be that application example of the present invention increasesPressure fan RB logical schematic; As shown in Figure 5, be tripping operation coal pulverizer step and time of application example booster fan RB of the present inventionLogical schematic. Designed logic has contained 3 subsystems in Power Plant DCS, comprises MCS(ModulatingControlSystem, analog control system) system (coordinating and RB logic), FSSS(FurnaceSafetySupervisionSystem, Boiler Furnace Safeguard Supervisory System, can be described as again burner management system (BurnerManagementSystem))System (tripping operation mill logic), desulfurization DCS system. Determine booster fan RB target for above-mentioned 600MW unit by field trialLoad is 280MW, and the booster fan RB control flow of design is as follows:
1, the triggering of booster fan RB: in the time that actual load is not less than 320MW and booster fan fault trip (by supercharging windMachine trip signal three is got two judgements) and unit cooperative system dropped into stove when the machine state, trigger booster fan RB and occur.
2, the switching of unit control mode: once booster fan RB triggers, follow machine state by unit cooperative system by stoveBe switched to machine following state, simultaneously regulate movable vane to be opened to entirely by current location booster fan with maximum rate (not speed limit)Open (100% aperture position, position. )
3, RB target load and load shedding speed: once booster fan RB triggering, by booster fan RB target load 280MW900MW/Min is placed to the load loop of coherent system with load reduction of speed rate, and 280MW is loaded to corresponding fuel quantity as combustionBoiler master is delivered in material instruction.
4, jump time consuming and step (as shown in Figure 5): once booster fan RB trigger, by according to the coal pulverizer of unit operationNumber of units, the step of the coal pulverizer that trips, jump mill principle and be: jump the superiors mills without time delay, with the reality of interval 5S by extremely upperLower order trips, and other coal pulverizer is also final retains three coal pulverizers operations of the bottom, and the instruction of jumping mill is delivered to FSSS system.Shown in table 1 specific as follows:
Table 1
5, RB involution: after booster fan RB triggers, unit actual load and booster fan RB target load difference meetBe less than 20MW or operations staff's hand-reset (as shown in Figure 4), booster fan RB involution condition meets.
After other blower fans RB, if fault blower fan can directly start then increasing and decreasing load difference of blower fan after can working, increaseAfter pressure fan RB involution, the Starting mode of follow-up booster fan is also another key content that can not ignore.
The design of follow-up startup scheme after application example booster fan RB of the present invention involution:
As shown in Figure 6, for again starting the Process Design signal of booster fan after application example booster fan RB of the present inventionFigure. After booster fan RB involution, the follow-up startup scheme of booster fan is with different with other blower fans RB: after other blower fans RB, if thereforeBarrier blower fan ascertains the reason and eliminates after fault can move, and can start blower fan and then on original load, directly complete the work of increasing and decreasing loadDo. But after booster fan RB involution, if the fault of booster fan is got rid of, can put into operation, can not be directly at the base of existing loadOn plinth, directly start booster fan, but load will be dropped to below the startup load point 160MW of booster fan, booster fanStarting load can be determined by preceding method.
The booster fan RB test of application example reality of the present invention is as follows:
According to above-mentioned design and test data, carry out actual booster fan RB test in Guo Huajin circle power plant,The booster fan of stopping transport in the time of unit load 550MW, triggers booster fan RB action, and within 26 seconds, rear hearth negative pressure recovers stable, loadIn 5 minutes, steadily drop to 262MW, whole process of the test is without any human intervention. Test is success once, specific as follows:
Carry out the RB test of booster fan one day. Before test, unit operating mode is as follows:
Unit load: 550MW
Coordinated control mode: stove is coordinated with machine
Operation mill situation: A, B, C, D, E
Total coal-supplying amount: 191.3t/h
Total blast volume: 1991.4t/h
Combustion chamber draft :-0.07KPa
Pressure: 16.42MPa before machine
Steam water-level :-10mm
Main stripping temperature: 543 DEG C
20:16:24 operations staff stops booster fan on the spot, after booster fan stops, triggers booster fan RB action:
---after → RB occurs, open booster fan without time delay with maximum rate and regulate movable vane to standard-sized sheet position (when actual actBetween be 31s)
---→ unit cooperative control mode is coordinated to be automatically switched to machine by stove with machine and is followed mode, and unit load is by 550MWSpeed with 600MW/MIN is down to 267MW, sets sliding pressure variable Rate 0.21MPa/Min, sets sliding pressure desired value from 16.42MpaBe down to 11.3MPa, locking increases machine comprehensive valve bit instruction
---after → FSSS system RB occurs, jump E mill without time delay, with the actual tripping operation D coal pulverizer of interval 5S, finally retainThree coal pulverizer operations of the bottom, the final fuel command of coal pulverizer is by being calculated as by flue resistance test and combustion test95.4t/h。
---→ RB reset target load is by being calculated as 276MW by flue resistance test and combustion test.
---other blower fan of → air and flue system (comprise send, air inducing and primary air fan) all keeps automatic adjustment state, maintainsCombustion chamber draft, air output, primary air pressure stable. Steam water-level, main Stream Temperature Control System all keep automatic adjustment state.
---4 points of → total systems tended towards stability after 22 seconds.
In whole process, the maximin of the change curve of each major parameter of unit in change procedure is as following table2:
Table 2
Minimum The highest Unit
Load 270 550 MW
Steam water-level -11 4 mm
Furnace pressure -110 980 Pa
Secondary Air air quantity 920 1991 T/h
Fuel quantity 95.4 191.3 T/h
Booster fan enters 90 600 Pa
Mouth pressure
Pressure before machine 16.42 11.3 MPa
Main stripping temperature 521 543
Reheat steam temperature 505 539
Application example scheme of the present invention: the test that (1) carries out Site for Unit is the critical data of design supercharging wind RB functionBasis. First carry out cold conditions, hot wind and smoke resistance test according to preceding method, and in conjunction with fan characteristic test and combustion testThe feasibility of data assessment booster fan RB function, determine target load and flue gas corresponding to target load of booster fan RBThe calculated value of the startup of unit load after after amount, booster fan RB involution. And measure characteristic and the pass of booster fan executing agencyClose the time. (2) booster fan RB Functional Design, according to preceding method, is directly patrolled by configuration and amendment in Power Plant DCS logicCollecting configuration can realize, when the key signal of triggering booster fan RB can be shut down light maintenance according to power plant as " booster fan fault is stopped "Increase after hard connecting line gets two by desulfurization DCS tri-and deliver to main frame DCS. (3) completing can be at unit compared with underload after (1) and (2)When (be the rated load of unit 60%, can load at 400MW for 600MW unit), carry out preliminary experiment one time, according to test numberAccording to result of the test, bulk testing scheme, Key experiments data being optimized and being improved. (4) completing can behind (1) and (2), (3)In the time of high load capacity, carry out formal booster fan RB test. (5) complete after booster fan RB test, handle booster fan eventBarrier, after booster fan can put into operation, by preceding method carry out booster fan RB complete after the startup of booster fan. Visible, itsAdvantage has three: 1, conceptual design implementation is strong, and existing theoretical calculating, in conjunction with unit actual tests data, is convenient to according to machine againGroup self character mates. 2, this programme does not need extra equipment to realize, and the DCS based on unit controls platform can be completeBecome, operability and control security are strong, are convenient to promote. 3, the domestic design that proposes first booster fan RB, and combinationThis scheme is verified on Guo Huajin circle 600MW unit, tests once success. Technical merit is reliable, ripe. In the face of environmental protectionPortion " 12 " reduces discharging requirement, and the shutoff work of each Desulphurization for Coal-fired Power Plant bypass is imperative, and application example of the present invention is by establishingThe testing program of obtaining of the key parameter of the overall plan of meter booster fan RB and the success of the test of guaranteeing, has filled up domestic increasingPressure fan is as the blank of the RB test of Important Auxiliary equipment. By designing new booster fan RB function, by desulfurization main equipment and masterUnit equipment is controlled and safeguards according to same standard and requirement, in the time of booster fan fault, avoids desulfurization by-pass damper to tear openExcept and flue shutoff after give the negative effect that brings of coal fired power generation unit operation, realize desulfurizer and synchronize with boiler main frame, growPhase, stable operation, greatly reduce the generation of the unplanned stoppage in transit of unit causing due to booster fan fault. For ensureing unitSafe operation, the unplanned stoppage in transit number of times of minimizing unit have decisive meaning, the unit safety to Power Plant Side and grid sidePower supply safety all plays important effect.
Those skilled in the art can also recognize the various illustrative components, blocks that the embodiment of the present invention is listed(illustrativelogicalblock), unit, and step can pass through electronic hardware, computer software, or both knotsClose and realize. For the clear replaceability (interchangeability) of showing hardware and software, above-mentioned various explanationsProperty parts (illustrativecomponents), unit and step have been described their function generally. Such meritCan be to realize by hardware or software the designing requirement of depending on specific application and whole system. Those skilled in the artCan, for every kind of specific application, can make in all sorts of ways and realize described function, but this realization should not be understood toExceed the scope of embodiment of the present invention protection.
Various illustrative logical block described in the embodiment of the present invention, or unit can pass through general processor,Digital signal processor, special IC (ASIC), field programmable gate array or other programmable logic device, discrete gateTransistor logic, discrete hardware components, or the design of above-mentioned any combination realizes or operates described function. General placeReason device can be microprocessor, and alternatively, this general processor can be also any traditional processor, controller, microcontrollerDevice or state machine. Processor also can be realized by the combination of calculation element, for example digital signal processor and microprocessor,Multi-microprocessor, a Digital Signal Processor Core of one or more microprocessor associating, or any other similarly configuresRealize.
Method described in the embodiment of the present invention or the step of algorithm can directly embed the soft of hardware, processor executionPart module or the two combination. Software module can be stored in RAM memory, flash memory, ROM memory, EPROM storageThe storage medium of other arbitrary form in device, eeprom memory, register, hard disk, moveable magnetic disc, CD-ROM or this areaIn. Exemplarily, storage medium can be connected with processor, with make processor can be from storage medium reading information, andCan deposit write information to storage medium. Alternatively, storage medium can also be integrated in processor. Processor and storage medium canTo be arranged in ASIC, ASIC can be arranged in user terminal. Alternatively, processor and storage medium also can be arranged at useIn different parts in the terminal of family.
In one or more exemplary designs, the described above-mentioned functions of the embodiment of the present invention can be at hardware, softPart, firmware or this three's any combination realizes. If realized in software, these functions can be stored with computer-readableOn medium, or be transmitted on the medium of computer-readable with one or more instructions or code form. Computer-readable medium comprises electricityBrain storage medium and be convenient to make to allow computer program transfer to other local telecommunication media from a place. Storage medium canIt is the useable medium that any general or special computer can access. For example, such computer readable media can comprise butBe not limited to RAM, ROM, EEPROM, CD-ROM or other optical disc storage, disk storage or other magnetic storage device, or otherWhat can be by general or special computer or general or specially treated with instruction or data structure and other for carrying or storageDevice reads the medium of the program code of form. In addition, any connection can be suitably defined as computer-readable medium, exampleAs, if software is by a coaxial cable, fiber optic cables, two from a web-site, server or other remote resourceTwisted wire, Digital Subscriber Line (DSL) or defined with being also comprised in of the wireless way for transmittings such as such as infrared, wireless and microwaveIn computer-readable medium. Described video disc (disk) and disk (disc) comprise Zip disk, radium-shine dish, CD, DVD, floppy diskAnd Blu-ray Disc, disk is conventionally with magnetic duplication data, and video disc carries out optical reproduction data with laser conventionally. Above-mentioned combinationAlso can be included in computer-readable medium.
Above-described detailed description of the invention, has carried out further object of the present invention, technical scheme and beneficial effectDescribe in detail, institute it should be understood that and the foregoing is only the specific embodiment of the present invention, is not intended to limit the present inventionProtection domain, within the spirit and principles in the present invention all, any amendment of making, be equal to replacement, improvement etc., all should compriseWithin protection scope of the present invention.

Claims (9)

1. a method of power plant's booster fan runback RB, is characterized in that, described method comprises:
Under the operating mode breaking down at unit booster fan, trigger booster fan RB;
The load of unit is down to current operational outfit and is allowed the corresponding preset booster fan RB target load of exerting oneself, exist simultaneouslyThe moment of booster fan tripping operation is utilized booster fan movable vane standard-sized sheet, sets up the passage of a flue gas flow, to avoid the non-of unitDraw and stop transport, guarantee the operation of unit.
2. the method for power plant's booster fan runback RB as claimed in claim 1, is characterized in that, described at unitUnder the operating mode that booster fan breaks down, trigger booster fan RB, comprising:
In the time that unit booster fan breaks down tripping operation and when unit cooperative system has dropped into stove with machine state, trigger supercharging windMachine RB occurs.
3. the method for power plant's booster fan runback RB as claimed in claim 2, is characterized in that, described unit increasesPressure fan breaks down to trip and gets two judgements by booster fan trip signal three.
4. the method for power plant's booster fan runback RB as claimed in claim 1, is characterized in that, described by unitLoad be down to current operational outfit and allow the corresponding preset booster fan RB target load of exerting oneself, jump at booster fan simultaneouslyThe moment of lock is utilized booster fan movable vane standard-sized sheet, sets up the passage of a flue gas flow, to avoid the unplanned stoppage in transit of unit, guaranteesThe operation of unit, comprising:
Unit cooperative system is switched to machine following state by stove with machine state, with speed limit not, booster fan is regulated to movable vane simultaneouslyOpen to standard-sized sheet position;
Preset booster fan RB target load is placed to the load loop of coherent system, and preset booster fan RB target is negativeThe fuel quantity that lotus is corresponding is delivered to boiler master as fuel command;
By according to the number of units of the coal pulverizer of unit operation, the step of the coal pulverizer that trips, jumps mill principle and is: jump and go up most without time delayLayer mill, with the reality of interval 5S trip other coal pulverizer finally retain three coal pulverizers operations of the bottom of order from top to bottom,And the instruction of jumping mill is delivered to Boiler Furnace Safeguard Supervisory System FSSS system.
5. the method for power plant's booster fan runback RB as claimed in claim 1, is characterized in that, described method alsoComprise:
After booster fan RB triggers, if unit actual load and preset booster fan RB target load difference satisfied be less than presetDifference or operations staff's hand-reset, trigger booster fan RB involution:
The startup load point that the load of unit is dropped to preset booster fan is restarted booster fan below.
6. a device of power plant's booster fan runback RB, is characterized in that, described device comprises:
Trigger element, under the operating mode breaking down at unit booster fan, triggers booster fan RB;
DCS control module, allows for the load of unit being down to current operational outfit the corresponding preset booster fan of exerting oneselfRB target load utilizes booster fan movable vane standard-sized sheet in the moment of booster fan tripping operation simultaneously, sets up the passage of a flue gas flow,To avoid the unplanned stoppage in transit of unit, guarantee the operation of unit;
Described trigger element, under the operating mode breaking down at unit booster fan, triggers booster fan RB, comprising: work as unitWhen booster fan breaks down tripping operation and when unit cooperative system has dropped into stove with machine state, trigger booster fan RB and occur.
7. the device of power plant's booster fan runback RB as claimed in claim 6, is characterized in that, described unit increasesPressure fan breaks down to trip and gets two judgements by booster fan trip signal three.
8. the device of power plant's booster fan runback RB as claimed in claim 6, is characterized in that, described DCS controlUnit processed, allows specifically for the load of unit being down to current operational outfit the corresponding preset booster fan RB target of exerting oneselfLoad utilizes booster fan movable vane standard-sized sheet in the moment of booster fan tripping operation simultaneously, sets up the passage of a flue gas flow, to avoidThe unplanned stoppage in transit of unit, guarantees the operation of unit, comprising: unit cooperative system is switched to machine by stove with machine state and follows shapeState, simultaneously regulates movable vane to open to standard-sized sheet position booster fan with speed limit not; Preset booster fan RB target load is placed toThe load loop of coherent system, and fuel quantity corresponding to preset booster fan RB target load delivered to boiler as fuel commandMaster control; By according to the number of units of the coal pulverizer of unit operation, the step of the coal pulverizer that trips, jumps mill principle and is: jump without time delayUpper strata mill, with the reality of interval 5S trip other coal pulverizer final three coal pulverizers fortune of the bottom that retain of order from top to bottomOK, and by the instruction of jumping mill deliver to Boiler Furnace Safeguard Supervisory System FSSS system.
9. the device of power plant's booster fan runback RB as claimed in claim 6, is characterized in that,
Described trigger element, also for after triggering as booster fan RB, if unit actual load and preset booster fan RB targetLoad difference is satisfied is less than preset difference or operations staff's hand-reset, triggers booster fan RB involution;
Described DCS control module, also restarts increasing below for the startup load point that the load of unit is dropped to preset booster fanPressure fan.
CN201310189246.3A 2013-05-21 2013-05-21 Method and the device of a kind of booster fan runback RB of power plant CN104179704B (en)

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CN107748547B (en) * 2017-10-12 2019-06-04 国网河北能源技术服务有限公司 Fired power generating unit depth peak regulation operating condition underload breaker trip autocontrol method
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