CN202938341U - DCS (distributed control system) for boiler biomass fuel - Google Patents
DCS (distributed control system) for boiler biomass fuel Download PDFInfo
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- CN202938341U CN202938341U CN 201220594852 CN201220594852U CN202938341U CN 202938341 U CN202938341 U CN 202938341U CN 201220594852 CN201220594852 CN 201220594852 CN 201220594852 U CN201220594852 U CN 201220594852U CN 202938341 U CN202938341 U CN 202938341U
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Abstract
The utility model relates to a DCS (distributed control system) for boiler biomass fuel. The DCS mainly comprises a front end dosing module, a middle end detection module and a rear end DCS, wherein the front end dosing module is provided with a reclaimer which is provided with a weighing instrument, the middle end detection module comprises a moisture detection device and a weight detection device arranged on a feeder which is butted with the feed port of a boiler, the reclaimer and the feeder are respectively provided with a speed detection device, and the rear end DCS mainly comprises a power module, a DPU (distribute process unit) controller, an input/output module, a communication module and a human-computer interface. The fuel value and practical fuel quantity are calculated according to the fuel weight and the moisture detection result, and the revolving speed of the feeder is controlled according to the calculation result so as to control the fuel quantity. Therefore, the DSC of a biomass power plant for fuel combustion is controlled automatically and accurately, so that the purpose of improving the economic benefit of the biomass power plant and the personal safety is realized.
Description
Technical field
The utility model belongs to the biomass fuel technical field of power generation, and the boiler biomass fuel that is specifically related to a kind of biomass power plant is controlled the DCS system.
Background technology
Along with country widelys popularize novel energy, the biomass fuel generation technology is with its energy-conserving and environment-protective, the effect that will account for the weight of stopping in national new energy development development strategy.Although present dcs (being called for short DCS) ripe utilization in thermal power industry, the DCS fuel of coal-fired unit and circulating fluid-bed (burning inferior coal and gangue) unit are controlled all mature and reliable very; And in the biomass fuel power plant, the DCS of fuel does not also have successful story, entangles its reason and is the biomass fuel diversity that biomass fuel causes with factors such as season, time, regions and change with the water content of fuel that weather, human factor cause and cause.Bring thus other automatic control systems of biomass fermentation electric boiler also can't drop into, can only rely on operations staff's online real-time operation.Finally can cause some problems such as the boiler main steam superpressure that causes due to fuel problem, overtemperature, bring power plant load change excessive, equipment loss greatly, the problems such as invisible waste of operations staff's increase, fuel, the more serious accident that may bring the harm safe operation of power plant such as unexpected chaser, operations staff's safety, cause on the power plant economic benefit, the heavy losses on operations staff's safety, increased the operating cost of biomass power generation enterprise.
At present, the Fuel Control System control flow chart that use in most of thermal power plants as shown in Figure 1, in this flow chart: Y represent controlled volume, the N such as unit load and main steam pressure represent various load instructions, Mb represent Static Design fuel quantity, Db represent boiler oil instruction, Rb represent load alternation process in the feedforward of boiler oil amount adjust signal, △ P represents that deviation, the Rp of main steam pressure represent main steam deviation PID regulated quantity; Whole control procedure is: the total fuel quantity signal Ff of Db instruction and boiler compares and computing in fuel rate controller PID, then removes to control each feeding coal and burner hearth air quantity, thereby makes Ff follow Db.In Fig. 1, total fuel quantity Ff multiply by fuel coefficient R by the actual feeding coal Fc that batcher records, and adds the light oil fuel amount Fl after the superheat value conversion.That is: Fc=(Ff-Fl)/R;
R in formula is manual setting value, is used under abnormal conditions the manual intervention to unit control system.It can directly change the natural fuel amount Fc of system, and other parameter of system is exerted one's influence.Therefore it has vital effect to the quality of whole control system.
For example, when R=1.0, if when the actual combustion value of fuel is higher than the design combustion value, be equivalent to drop into fuel more.The unnecessary heat of this part will show by main vapour pressure overgauge and overtemperature, and then by pressure regulation circuit successive elimination deviation.And for direct blow boiler, the time inertia of pressure regulation circuit is larger, thereby it is the mechanism of a kind of hysteresis, fluctuation.And in the parameter coordination control system, for significantly vibration appears in anti-locking system, general when varying duty, the integral action in pressure regulation circuit (I) is arranged on the weak side, the effect of adjuster is mainly proportional action (P).So in later stage of varying duty process significantly, main vapour pressure and main stripping temperature often exist the long period, wider margin of variation.Otherwise, if fuel value for design during fuel value, and that the R value arranges is unreasonable, also can cause above-mentioned impact.
Above-mentioned two situations are disadvantageous to the safe operation of unit.When unit rose at full capacity, due to the restriction of steam turbine power generation unit upper load limit, unnecessary heat energy can make main vapour pressure further rise, and may cause the safety door action, even chaser.Also can cause the main steam overtemperature in the time of the main steam superpressure.Can certainly come adjustment System by the value of modified R, but its method is hysteresis, passive equally.And each operations staff also varies with each individual to the adjusting range of coefficient and the assurance on opportunity, thereby exists uncertainty, reduced control system.
The utility model content
The technical problems to be solved in the utility model is: the diverse problems for biomass fuel reaches the problem that existing thermal power plant combustion control system can't be suitable for, and provides a kind of boiler biomass fuel that is suitable for biomass power generation to control the DCS system.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is:
Boiler biomass fuel is controlled the DCS system, it is characterized in that: mainly comprise front end batching module, middle-end detection module and rear end DCS system; Front end batching module arranges reclaimer, and weighing instrument is set on reclaimer; The middle-end detection module comprises device for detecting water content and the Weight detecting device that is arranged on batcher, and batcher docks with the boiler feed mouth; Reclaimer and batcher arrange respectively speed detector; Rear end DCS system mainly comprises power module, DPU controller, input/output module, communication module, man-machine interface; Weighing instrument is connected output and is connected with rear end DCS system input/output module signal with Weight detecting device, each speed detector is connected with rear end DCS system input/output module signal respectively; The device for detecting water content output is connected with rear end DCS system input/output module signal.
By technique scheme, described Weight detecting device is Weighing feeder, and described device for detecting water content is the Microwave Water analyzer.
By technique scheme, between the communication module of front end batching module and rear end DCS system communication module, two-way signaling connects.
During material loading, front end batching module is according to setting the fuel ratio feeding and the natural fuel amount that records being fed back to front end batching module, front end batching module is carried out deviation according to this feedback signal and instruction feeding signal and is calculated, then according to calculated value correction feeding speed and feeding amount to reach the setting fuel ratio; Simultaneously, front end batching module is sent to rear end DCS system with real-time fuel ratio; Before fuel enters burner hearth, detect respectively weight of fuel and water content of fuel in the middle-end detection module, equivalent fuel value and natural fuel amount are calculated according to weight of fuel and water content testing result by rear end DCS system, thereby and control fuel quantity according to the rotating speed that result of calculation is controlled batcher; During fuel combustion, rear end DCS system is by actual feeding coal and instruction feeding coal, and the bonded boiler operational factor is regulated each fuel feed and burner hearth air quantity.
The idiographic flow that rear end DCS system carries out the fuel quantity adjusting is: according to setting calorific value calculation instruction boiler oil amount Db, instruction boiler feeding coal Db and the total fuel quantity Ff of boiler are compared in fuel rate controller PID, then control feeding coal and burner hearth air quantity, make Ff follow Db;
The total fuel quantity of boiler
Each parameter is: actual fuel quantity Fc, calorific value coefficient V, the light oil fuel amount Fl after the superheat value conversion of giving of boiler;
The actual fuel quantity Fc=FCx (1--RH%) that gives of boiler; Wherein, FC: the fuel feeding coal of weighing; RH%: the moisture percentage value of fuel quantity;
Calorific value coefficient V=V1+B; V1 for utilize divalence inertial element F (t) to carry out filtering to the dynamic value of V0 and suppress after fuel equivalence calorific value relatively;
The corresponding transfer function of second-order inertia link F (t) is:
In following formula, s is the Laplace transformation oeprator; K is constant;
For second order link undamped is shaken frequency naturally;
For second order link undamped coefficient (
＞=1); The dynamic process duration parameter of second-order inertia link
, the time parameter of F in system (t) is set according to the field conduct result of the test;
B is the manual biasing coefficient of intervening under abnormal conditions;
Fuel equivalence relatively hot value coefficient V0=C1/C2, wherein, C2=Fc represents actual feeding coal; C1=Mb+Rb-Fl represents that the Static Design fuel quantity adds that varying duty fuel quantity feed-forward signal deducts the light oil fuel amount again.
Thus, boiler biomass fuel precisely controlling system of the present utility model enters hearth combustion from biomass electric power plant front end fuel conveying-middle-end detection of fuel-rear end fuel and controls three aspect analyzing and processing, the DCS that reaches the biomass electric power plant fuel combustion precisely controls automatically, realizes the purpose that improves in biomass electric power plant economic benefit and personal safety.
Description of drawings
Fig. 1 is the Fuel Control System control flow chart that in prior art, use in the thermal power plant;
Fig. 2 is the control principle block diagram that the utility model boiler biomass fuel is controlled the DCS system;
Fig. 3 is that boiler biomass fuel of the present utility model is controlled DCS system control flow chart.
Fig. 4 is rear end of the present utility model DCS system construction drawing.
The specific embodiment
The utility model is described in further detail below in conjunction with accompanying drawing 2-4 and the specific embodiment:
With reference to accompanying drawing 2, boiler biomass fuel of the present utility model is controlled the DCS system and is mainly comprised front end batching module, middle-end detection module and DCS system rear end regulation unit; Front end batching module determines propellant composition and fuel quantity by weight when material loading, the middle-end detection module respectively the fuel that will enter burner hearth is carried out online weight detecting and online water content detects; Rear end DCS system transfers natural fuel weight and the water content that obtains according to detection, with reference to the equivalent weight of each fuel of calorific value fuel metering control system relatively of each fuel.
Front end fuel counterweight: when material loading, front end batching module can provide the instruction of corresponding fuel material loading to each reclaimer according to the fuel ratio of setting, each reclaimer is according to this instruction feeding, weighing instrument on each reclaimer can feed back to the weight proportion module to the natural fuel amount that records, the proportioning module can be done corresponding deviation calculating according to this feedback signal and command signal, the rear feeding speed according to this calculated value correction reclaimer of combustion is to reach desirable fuel ratio.Last proportioning module can be sent to the DCS system with real-time fuel ratio.
We know the fuel of biomass electric power plant along with the variation of season, region, and the kind of living beings also changes occuring, even in same season, biomass fuel also has a variety of.Also just there has been diversity in the fuel type that at this time supplies to biomass electric power plant.Because the kind of living beings is different, and the part characteristics of biomass electric power plant based on fuel also can select several biomass fuels to mix the situation of burning, in these cases, the biomass fuel diversity bring biomass combustion the time combustion heat value nonuniqueness difficult problem that caused DCS fuel to control.
In order to resolve the problem of the fuel value nonuniqueness that brings when multiple living beings participate in burning simultaneously, it is particularly important that strict fuel ratio just seems.So-called fuel ratio says to be exactly to allow simultaneously the various biomass fuels that participate in burning mix in certain proportion according to weight join on stricti jurise.Such as needing in real time 10 tons of fuel, the actual fuel of mixing burning has three kinds, and we can be just 5:4:1 or 4:4:2 etc. according to the weight proportion of fuel.Concrete weight of fuel proportioning ratio is decided in its sole discretion in conjunction with fuel characteristic and on-site actual situations by the operations staff.The strict fuel ratio of carrying out is the prerequisite that rear end fuel is controlled, and it is key is self-evident!
Middle-end detection of fuel: before fuel enters burner hearth, native system has been installed fuel middle-end detection module, the middle-end detection module mainly is divided into weighing unit and the online moisture monitoring of fuel unit, weighing unit (belt conveyer scale) is the detection to weight of fuel, and finally the rotating speed by weight of fuel detection signal FEEDBACK CONTROL conveyer reaches the purpose of controlling fuel quantity.Online moisture unit is the detection to water content of fuel, and the detection of water content is the correction to weight of fuel and fuel combustion value, and the functional operation of this part is completed in the DCS system.Obtain the actual equivalent fuel value of fuel quantity by fuel moisture and weight, obtain concrete fuel quantity by biomass fuel calorific value analytical table, thereby thereby fuel quantity controlled according to the rotating speed of result of calculation control batcher;
Introducing the detection of online water analysis, is mainly that living beings can be along with reasons such as different weather, regions, and its water content can change.The living beings change of moisture content directly affects the weight of biomass fuel, and actual influence is the combustion value of fuel at last.So we need to detect water content of fuel in the middle-end detection of fuel, then in the DCS control system, the weight of fuel is revised, obtain actual weight of fuel.
Rear end fuel is controlled: mainly be made of the DCS system; The DCS system comprises power module, DPU controller (multipurpose controller), input/output module, communication module, man-machine interface.Calculating, the control logic of the input of the control signal of whole system, control function calculated, the output of control instruction is all realized by the DCS system.Man-machine interface is to realize " dialogue " system of people and system: comprising the setting of parameter, the feedback of parameter, the historical information of parameter, the running status of system etc.Set up combustion value library file and corresponding computing function in the DCS system, introduce the relative calorific value of equivalence boiler control system, reach control to fuel in conjunction with the means such as control method of biomass power plant characteristics.Set up combustion value database and corresponding computing function, its objective is to allow the combustion value of fuel become unique; The boiler control system of the relative calorific value of equivalence is actual is exactly the proportion function of expecting to amount with actual feeding coal and design, and further revises fuel quantity in conjunction with the boiler operating parameter relevant with fuel.The final purpose of carrying out accurate feed control.The data of library file such as following table 1:
Table 1: biomass fuel calorific value analytical table
For library file, each biomass fermentation fuel can replenish and delete according to actual conditions.
Its computing function, in fact only needs are introduced total combustion value summing function of various living beings.
The rear end regulation and control system is mainly to utilize the relative calorific value of equivalence to carry out intense adjustment to the combustion coefficient of fuel.Its flow chart is with reference to Fig. 3:
In this flow chart, because there is significantly ordinary fluctuation in unit load, introduce a calorific value coefficient V or V2 and come the replacing fuel coefficients R.Y represents that controlled volume unit load and main air pressure, N represent to load instruction, Mb represents that Static Design fuel quantity, Db represent that the instruction of boiler oil amount, Rb represent that varying duty fuel quantity feed-forward signal, △ P represent that main air pressure deviation, Rp represent main air pressure deviation PID regulated quantity; Whole control procedure is: the total fuel quantity Ff of boiler oil amount instruction Db and boiler compares and computing in fuel rate controller PID, then removes to control each feeding coal and burner hearth air quantity, thereby makes Ff follow Db.The total fuel quantity Ff of boiler is
, wherein, the actual fuel quantity Fc=FCx (1--RH%) that gives of boiler; The actual feeding coal Fc that is recorded by batcher multiply by calorific value coefficient V, adds the light oil fuel amount Fl after the superheat value conversion.
Wherein: C1=Mb+Rb-Fl represents to add that with the Static Design fuel quantity varying duty fuel quantity feed-forward signal deducts the light oil fuel amount again; C2=Fc represents actual feeding coal; V0=C1/C2 represents fuel equivalence relatively hot value coefficient, namely sets the ratio of fuel quantity and natural fuel amount, and it is an important indicator of fuel change;
Before unit starting and after shutting down in process; the boiler oil amount is very little or without fuel (be C1, the C2 value is less or equal zero); in order to prevent the error brought of ratio of two little values this moment; need C1, C2 are carried out amplitude limiting processing, make unit automatically be preset as 1 with shutdown process fuel equivalence afterwards relatively hot value coefficient V0 before starting.
In above-mentioned operational loop, various input signals can fluctuate along with the operation of system, so in order to reduce it to the impact of calorific value signal V, be necessary again to add in operational loop a divalence inertial element F (t) to carry out filtering and inhibition to the dynamic value of V0, can stably reflect fuel equivalence calorific value relatively.The corresponding transfer function of second-order inertia link F (t) is:
In following formula, s is the Laplace transformation oeprator; K is constant;
For second order link undamped is shaken frequency naturally;
For second order link undamped coefficient (
＞=1).Get the dynamic process duration parameter of this second-order inertia link:
, the time parameter of F in system (t) is set according to the field conduct result of the test.
Being convenient under abnormal conditions unit operation person in system can carry out intervening rapidly and intuitively to system, has added manual biasing coefficient B (amplitude of B is very little) in coefficient V1.Stack by V1 and B obtains V2 coefficient, i.e. V2=V1+B.
In above system, no matter unit is in steady load or varying duty, because the total fuel quantity Ff (value of feedback in pid control circuit) of equivalence can follow fuel quantity instruction Db (set-point) fast, in fact the PID adjuster plays a follower, so visual Ff=Db.Again because the effect of F (t), make V1 than stable many of V0.If do not consider B, and combustion value normal in system stably in situation calorific value coefficient V or V2 be also stable.At this moment, Mb still plays the load feedforward effect; Rb plays the effect of varying duty amount of stored heat feedforward compensation; Rp plays main air pressure adjustment effect; And Fc can follow corresponding variation of above-mentioned 3 instructions work.In this case, no matter be constant load or varying duty, as long as Rp=0, the V0=C1/C2 value is constant, in essence, equivalent relatively hot value coefficient is not affected by the unit lifting load.When fuel value changes or system when fluctuation occurs, effect due to main barostat PID, its output Rp will regulate natural fuel amount Fc rapidly, comes the variation (being to imply one-component in Fc to come balance Rp) of balance Rp instruction by changing Fc.Due to Fc along with Rp changes, thereby cause the C1/C2 value to change, therefore and equivalent relatively hot value coefficient also can change lentamente.Conversely, from macroscopic perspective, the change of V also can make Rp indirectly have the opposite effect, and finally makes Rp revert to equalization point, has set up a kind of organic inner link between them, and qualitative analysis is as follows;
As: △ P ↓ → Rp ↑ → Fc ↑ → Ff ↑ → V0 ↓ → V1 ↓ → V ↓ → Ff ↓ → Fc ↑ → △ P ↑ → Rp ↓
Along with the prolongation of time, system fluctuation amplitude fading, V1 gradually level off to V0, system can enter a kind of optimum state automatically.When the unit constant load, Mb, Rb and Fl remain unchanged, and control system can be revised equivalent relatively hot value coefficient automatically, makes system be tending towards static equilibrium point.Finally, the variation of Fc is offset by the variation of V, makes between the two product and Ff also constant.
Claims (3)
1. boiler biomass fuel is controlled the DCS system, it is characterized in that: mainly comprise front end batching module, middle-end detection module and rear end DCS system; Front end batching module arranges reclaimer, and weighing instrument is set on reclaimer; The middle-end detection module comprises device for detecting water content and the Weight detecting device that is arranged on batcher, and batcher docks with the boiler feed mouth; Reclaimer and batcher arrange respectively speed detector; Rear end DCS system mainly comprises power module, DPU controller, input/output module, communication module, man-machine interface; Weighing instrument is connected output and is connected with rear end DCS system input/output module signal with Weight detecting device, each speed detector is connected with rear end DCS system input/output module signal respectively; The device for detecting water content output is connected with rear end DCS system input/output module signal.
2. boiler biomass fuel according to claim 1 is controlled the DCS system, and it is characterized in that: described Weight detecting device is Weighing feeder, and described device for detecting water content is the Microwave Water analyzer.
3. boiler biomass fuel according to claim 1 and 2 is controlled the DCS system, it is characterized in that: between the communication module of front end batching module and rear end DCS system communication module, two-way signaling connects.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104676574A (en) * | 2014-12-31 | 2015-06-03 | 清华大学 | Energy balance-based control method of main steam pressure of supercritical CFB (circulating fluidized bed) boiler |
| CN107250671A (en) * | 2015-02-19 | 2017-10-13 | 英瑞公司 | For the control system for the charging for controlling solid fuel in combustion |
| CN109060406A (en) * | 2018-08-21 | 2018-12-21 | 嘉兴新嘉爱斯热电有限公司 | The automatic sampling analysis system of biomass fuel |
-
2012
- 2012-11-13 CN CN 201220594852 patent/CN202938341U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104676574A (en) * | 2014-12-31 | 2015-06-03 | 清华大学 | Energy balance-based control method of main steam pressure of supercritical CFB (circulating fluidized bed) boiler |
| CN104676574B (en) * | 2014-12-31 | 2017-01-04 | 清华大学 | Supercritical CFB Boiler main steam pressure control method based on the energy balance |
| CN107250671A (en) * | 2015-02-19 | 2017-10-13 | 英瑞公司 | For the control system for the charging for controlling solid fuel in combustion |
| CN109060406A (en) * | 2018-08-21 | 2018-12-21 | 嘉兴新嘉爱斯热电有限公司 | The automatic sampling analysis system of biomass fuel |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: KAIDI ELECTRIC POWER CO., LTD., WUHAN Effective date: 20140106 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20140106 Address after: 613, room 430223, Katie building, Jiangxia Road, Miao Shan Development Zone, Jiangxia District, Hubei, Wuhan Patentee after: WUHAN KAIDI ELECTRIC POWER ENGINEERING Co.,Ltd. Patentee after: WUHAN KAIDI ELECTRIC POWER Co.,Ltd. Address before: 613, room 430223, Katie building, Jiangxia Road, Miao Shan Development Zone, Jiangxia District, Hubei, Wuhan Patentee before: Wuhan Kaidi Electric Power Engineering Co.,Ltd. |
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| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Wuhan Kaidi Electric Power Engineering Co.,Ltd. Assignor: WUHAN KAIDI ELECTRIC POWER Co.,Ltd. Contract record no.: 2014420000107 Denomination of utility model: DCS (distributed control system) for boiler biomass fuel Granted publication date: 20130515 License type: Exclusive License Record date: 20140613 |
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| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130515 Termination date: 20211113 |