CN109062149A - A kind of coal motor group fuel quantity dispersion amendment and control method based on coal-fired calorific value - Google Patents
A kind of coal motor group fuel quantity dispersion amendment and control method based on coal-fired calorific value Download PDFInfo
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- CN109062149A CN109062149A CN201810711334.8A CN201810711334A CN109062149A CN 109062149 A CN109062149 A CN 109062149A CN 201810711334 A CN201810711334 A CN 201810711334A CN 109062149 A CN109062149 A CN 109062149A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM]
- G05B19/41865—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM] characterised by job scheduling, process planning, material flow
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/32—Operator till task planning
- G05B2219/32252—Scheduling production, machining, job shop
Abstract
The present invention relates to coal-fired power generation field, especially a kind of coal motor group fuel quantity dispersion amendment and control method based on coal-fired calorific value.For solve the problems, such as current point storehouse mix burning coal motor group cause fuel quantity to adjust under existing control method distortion causes unit stable and safety is affected, the present invention provides a kind of coal motor group fuel quantity dispersion amendment and control method based on coal-fired calorific value, counter circuit is fed back by newly-designed coal amount, the coal amount used is converted to design coal equivalent, the distortion for avoiding BTU correction coefficient under average coal quality consecutive variations operating condition, improves the precision of fuel control；It increases coal calorific value to be manually entered, mixes burning suitable for a variety of low calorific value coals, being precisely controlled for coal amount can be achieved according to design coal equivalent；In the case that low calorific value coal has price advantage, the stable operation of unit safety was not only met, but also there is preferable economy.
Description
Technical field
The present invention relates to coal-fired power generation field, especially a kind of coal motor group fuel quantity based on coal-fired calorific value disperses amendment
With control method.
Background technique
For the variation for adapting to current power coal market, fossil power plant can all select relatively low low of units of heat price
Medium-heat-value coal reduces production cost.The low heat value that existing coal motor group uses mixes burning mode mainly for low calorific value coal and conventional coal
It is mixed by different mixed-fuel burning proportions or low calorific value coal burns with conventional coal point storehouse, due to unit extensive, the reason that uses coal characteristic
May use a variety of coals simultaneously in same unit on, in actual production for reduce operation complexity only mix burn it is a kind of low
Medium-heat-value coal.
As shown in Figure 1, the control logic that the fuel regulation method of coal motor group is taken at present be still single coal,
It is single use under the conditions of, to mix burn after the variation of average as-fired coal calorific value a pot coal-supplying amount corrected by BTU correcting logic have partially
When poor, BTU correction coefficient is changed by integral action, wherein the usual the mount of using heat signal of drum boiler corrects the calorific value of fuel, directly
Stream furnace mostly uses steam flow to correct.Current routine coal electricity unit allocation carries out calorific value amendment by BTU correcting logic, still
The conventional BTU correction time of integration is generally longer, is generally all disposed within several kiloseconds to tens of thousands of seconds, is using mean calorie difference not
Coal-supplying amount can also be relatively accurately adjusted when big conventional coal, but when the mean calorie of as-fired coal changes greatly, it is necessary to
Very long time BTU correction coefficient can correctly reflect to be averaged the actual change of coal quality into furnace, the load such as during correction
It changes, feedforward action amount is actually to be distorted.Common coal motor group use low calorific value coal have mix with burning and a point storehouse fire
Two kinds are burnt, in the case where mixing with combustion system, the mixed proportion of conventional coal and low calorific value coal determines the mean calorie of Mixture Density Networks, mixes after matching
Coal quality is basicly stable, therefore the variation of BTU correction coefficient is small, and the distortion in adjustment process is also smaller, and BTU correction coefficient is once adjusted
In place then with conventional operation when be no different, but pre- blending burn two kinds of coals need to mix in advance, larger pressure can be brought to coal yard, very
Burning is mixed to reduce a workload selection point storehouse for coal yard mixing by more power plant.Burning is mixed in point storehouse is distributed different types of coal to different coal-grindings
It is used in machine, to ensure that coal pulverizer is safely operated, operations staff can throw the coal pulverizer for using low calorific value coal in manual mode, this
The variation of conventional coal mill response load instruction under kind varying load condition only in automated manner, low calorific value coal mill coal-supplying amount base
This is constant, and the ratio for being equivalent to whole conventional coal and low calorific value coal so constantly changes, and conventional BTU correction at this time is unable to satisfy
Operating condition needs, and causing corrected feedback coal amount under dynamic operation condition with the mark coal equivalent that actually enters furnace, there are larger differences, in turn
Cause coal amount inaccurate, varying duty feedforward overshoot, a series of problems, such as coal-water ratio is unbalance, control effect is bad.If by all mills
Coal machine is all thrown in automated manner, although low calorific value coal mill and conventional coal mill all increase and decrease identical coal amount according to fuel command,
Once coal pulverizer operation number changes in operational process, the ratio variation of conventional coal and low calorific value coal, BTU is corrected again again
It is calculated.In conclusion point storehouse mixes burning low heat value and is easy to the distortion for causing fuel quantity to adjust under current control logic,
Influence the stability and safety of the operation of coal motor group.
Summary of the invention
The technical problem to be solved in the present invention and the technical assignment of proposition are to solve the coal motor group that burning is mixed in current point storehouse to exist
Causing fuel quantity to adjust distortion under existing control method causes unit stable and safe the problem of being affected, and provides one kind
Coal motor group fuel quantity dispersion amendment and control method based on coal-fired calorific value, the amendment can improve a point storehouse with control method
It mixes low calorific value coal under burning mode and mixes and burn operation stability and regulation performance；Further the method can also be according to different operation works
Condition and coal calorific value relocate the corresponding coal-supplying amount of load, and for the coal flexible setting of different coals quality, determine every
Platform coal pulverizer gives coal equivalent, designs the BTU conversion strategy of new coal amount, BTU amendment is lost in the case of solving coal quality consecutive variations
Genuine problem.
The present invention solves the technical solution that technical problem uses: a kind of coal motor group fuel quantity dispersion based on coal-fired calorific value
Amendment and control method, including the following implementation steps sequentially carried out:
1) design coal amount feeds back counter circuit, the calibration function of BTU is dispersed in the coal weighing of each coal pulverizer, to each
Coal pulverizer has coal calorific value to be manually entered, and counter circuit is converted the coal amount of each coal pulverizer directly as design after obtaining calorific value information
The equivalent of coal, the feedback coal amount as coordinated control；
2) it after being added the feedback coal amount of each coal pulverizer with the fuel oil fire coal equivalent after conversion, is corrected through the circuit BTU and generates association
Regulate and control total coal amount of system；
3) speed limit link is added after the input of coal calorific value；
4) in calorific value correction course, varying duty or unusual service condition, which such as occurs, causes the corrective loop BTU to stop correction or exit certainly
When dynamic, the calorific value corrective loop of dispersion also accordingly stops correction；
5) on the basis of using the new control logic of design, by coal-supplying amount total after correcting, practical coal-supplying amount value of feedback and design
The mean calorie that coal calorific value calculation goes out as-fired coal is monitored for operation.
The present invention relocates the corresponding coal-supplying amount of load according to different operating conditions and coal calorific value, and for not
Coal with coal quality also does flexible setting, and with the coal equivalent of giving of every coal pulverizer of determination, the new coal amount BTU of final design converts plan
Slightly, effectively solve the problems, such as that BTU amendment is distorted in the case of solving coal quality consecutive variations.The calibration function dispersion of BTU in step (1)
Into the coal weighing of each coal pulverizer, each coal pulverizer influence on system operation is fully considered；Step (2) effect be allow the circuit BTU into
Row further correction, there are compensating when deviation, the circuit is general for the calorific value definite value for grinding input at each and actual value calorific value
Coal amount is finely adjusted under steady state operating conditions, improves the quality of coordinated control；The effect of step (3) speed limit link is limitation coal amount
The rate of change of calorific value, coal-supplying amount does not fluctuate when guaranteeing calorific value input variation, makes the coal-supplying amount in coal handoff procedure
It is more steady；Step (4) effect is the mistake variation for preventing coal amount from feeding back；The calculated as-fired coal mean calorie of step (5) supplies
Operations staff, which monitors, understands coal motor group when coal varitation in forehearth.
The invention proposes a kind of coal motor group fuel quantity dispersion amendment and control method based on coal-fired calorific value, by new
The coal amount of design feeds back counter circuit, and the coal amount used is converted to design coal equivalent, avoids average coal quality consecutive variations work
The distortion of BTU correction coefficient under condition improves the precision of fuel control；It increases coal calorific value to be manually entered, be suitable for more
Kind low calorific value coal mixes burning, and being precisely controlled for coal amount can be achieved according to design coal equivalent；When low calorific value coal has price excellent
In the case where gesture, the stable operation of unit safety was not only met, but also there is preferable economy.
Detailed description of the invention
Fig. 1: existing control logic designs total coal weighing schematic diagram.
Fig. 2: control logic of the present invention designs total coal weighing schematic diagram.
Fig. 3: as-fired coal mean calorie calculates schematic diagram under control logic of the present invention.
Specific embodiment
The present invention is described further with specific embodiment for explanation with reference to the accompanying drawing.
As shown in figures 2-3, a kind of coal motor group fuel quantity dispersion amendment and control method based on coal-fired calorific value, including
The following implementation steps sequentially carried out:
1) design coal amount feeds back counter circuit, the calibration function of BTU is dispersed in the coal weighing of each coal pulverizer, to each
Coal pulverizer has coal calorific value to be manually entered, and counter circuit is converted the coal amount of each coal pulverizer directly as design after obtaining calorific value information
The equivalent of coal, the feedback coal amount as coordinated control；
2) it after being added the feedback coal amount of each coal pulverizer with the fuel oil fire coal equivalent after conversion, is corrected through the circuit BTU and generates association
Regulate and control total coal amount of system；
3) speed limit link is added after the input of coal calorific value；
4) in calorific value correction course, varying duty or unusual service condition, which such as occurs, causes the corrective loop BTU to stop correction or exit certainly
When dynamic, the calorific value corrective loop of dispersion also accordingly stops correction；
5) on the basis of using the new control logic of design, by coal-supplying amount total after correcting, practical coal-supplying amount value of feedback and design
The mean calorie that coal calorific value calculation goes out as-fired coal is monitored for operation.
The invention proposes a kind of coal motor group fuel quantity dispersion amendment and control method based on coal-fired calorific value, by new
The coal amount of design feeds back counter circuit, and the coal amount used is converted to design coal equivalent, avoids average coal quality consecutive variations work
The distortion of BTU correction coefficient under condition improves the precision of fuel control；It increases coal calorific value to be manually entered, be suitable for more
Kind low calorific value coal mixes burning, and being precisely controlled for coal amount can be achieved according to design coal equivalent；When low calorific value coal has price excellent
In the case where gesture, the stable operation of unit safety was not only met, but also there is preferable economy.
The method of the invention has carried out examination in electric No. 1 unit of energy Zhoushan, Zhejiang coal and has burnt, and coal No. 1 unit of electricity in Zhoushan faces to be super
Boundary's 1000MW coal unit, the unit boiler are B&W company ultra supercritical parameter SWUP boiler, configure six coal pulverizers, five
Operation one is spare.Mixing and burning coal is Indonesia's Import Coal, high-moisture high volatile, the coal calorific values of different batches 2800 ~
3600kcal/kg mixes burning using a point storehouse, and 2 ~ 3 coal pulverizers mix burning low calorific value coal.
Burning low calorific value coal is mixed on the basis of original designs control logic first, two middle layer mills use low calorific value coal and are in
Conventional coal mill of manual mode, remaining operation is in automated manner, and 5 mills are run below 800MW load, 800MW load with
It is upper to enable the 6th mill, it is modified by coal calorific value by BTU correction coefficient during operation, since BTU amendment is one relatively slow
Slow process, and since low calorific value coal mill is in manual mode, coal-supplying amount is almost unchanged, once load, which has, changes two kinds of coals
Ratio also changes therewith, and BTU restarts to correct, it is difficult to BTU correction coefficient be kept to remain a stabilization and correctly value.And
By all coal pulverizers all in automated manner, ground according to fuel command low calorific value coal mill with conventional coal increase or decrease it is identical
The regulated quantity of coal amount, low calorific value coal mill is obviously insufficient, can not rapidly and accurately respond load instruction.On the basis of former design logic
On mix burn low calorific value coal Coordinated Control Systems regulation performance it is opposite be deteriorated, period BTU correction coefficient is minimum to be down to 0.84.
Unit scheduled overhaul increases the method for the present invention during shutting down in control logic, and coal calorific value is increased in picture
Coal amount is converted into design coal equivalent according to design coal calorific value, then is multiplied and is corrected with BTU correction coefficient by input button
Total coal amount afterwards send the amendment for reducing BTU correction coefficient to fuel master control, since the coal calorific value of input is not completely accurate
, always and actual value is there are certain deviation, and the value for trying BTU correction coefficient during burning, which maintains 1 or so, slightly to be had slightly
The fluctuation of degree, and the coal pulverizer run is completely in automated manner, does not need the manual de-regulation of operations staff, and does not increase we
Compared to seeming more stable before method, the as-fired coal mean calorie counter circuit in addition designed prevents BTU correction coefficient from correct
Also operations staff can be allowed to understand the variation of coal quality in furnace in the case where reflection as-fired coal matter, monitored for operations staff.Load change
Rapidly, the major parameters such as main steam pressure, steam temperature, the degree of superheat, primary air pressure and combustion chamber draft are stablized for process response, meet machine
The requirement of group investment AGC operation, more than conventional operating condition additionally, due to coal amount under same load, total blast volume is constant, and primary air flow exists
Accounting increases in total blast volume.
Claims (1)
1. a kind of coal motor group fuel quantity dispersion amendment and control method based on coal-fired calorific value, including the following reality sequentially carried out
Apply step:
(1) design coal amount feeds back counter circuit, the calibration function of BTU is dispersed in the coal weighing of each coal pulverizer, to each
Platform coal pulverizer has coal calorific value to be manually entered, and counter circuit directly converts the coal amount of each coal pulverizer to set after obtaining calorific value information
Count the equivalent of coal, the feedback coal amount as coordinated control；
(2) it after being added the feedback coal amount of each coal pulverizer with the fuel oil fire coal equivalent after conversion, is corrected through the circuit BTU and generates association
Regulate and control total coal amount of system；
(3) speed limit link is added after the input of coal calorific value；
(4) in calorific value correction course, varying duty or unusual service condition, which such as occurs, causes the corrective loop BTU to stop correction or exit certainly
When dynamic, the calorific value corrective loop of dispersion also accordingly stops correction；
(5) on the basis of using the new control logic of design, by coal-supplying amount total after correcting, practical coal-supplying amount value of feedback and design
The mean calorie that coal calorific value calculation goes out as-fired coal is monitored for operation.
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| CN109718943A (en) * | 2019-01-22 | 2019-05-07 | 华润电力（海丰）有限公司 | A kind of pulverized coal preparation system control method and device |
| CN110056903A (en) * | 2019-04-29 | 2019-07-26 | 上海外高桥第二发电有限责任公司 | Fire coal mixes the coal method for determination of amount and system of different types of coal in the case of burning |
| CN110762507A (en) * | 2019-12-05 | 2020-02-07 | 福建华电永安发电有限公司 | Boiler gas production equalization system during mixed combustion of industrial waste |
| CN111538231A (en) * | 2020-06-01 | 2020-08-14 | 国电南京电力试验研究有限公司 | Fuel calorific value rapid correction method suitable for separate grinding mixed combustion mode |
| CN112379650A (en) * | 2020-11-20 | 2021-02-19 | 西安热工研究院有限公司 | Gradient constrained coal-fired unit heat value correction method |
| CN113739195A (en) * | 2021-08-26 | 2021-12-03 | 上海发电设备成套设计研究院有限责任公司 | Method, device, equipment and medium for controlling coal feeding amount of separate bins |
| CN115098822A (en) * | 2022-06-28 | 2022-09-23 | 西安热工研究院有限公司 | Method for correcting power consumption of coal feeding system in overall performance test of coal-fired unit |
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| CN111538231A (en) * | 2020-06-01 | 2020-08-14 | 国电南京电力试验研究有限公司 | Fuel calorific value rapid correction method suitable for separate grinding mixed combustion mode |
| CN112379650A (en) * | 2020-11-20 | 2021-02-19 | 西安热工研究院有限公司 | Gradient constrained coal-fired unit heat value correction method |
| CN112379650B (en) * | 2020-11-20 | 2022-02-11 | 西安热工研究院有限公司 | Gradient constrained coal-fired unit heat value correction method |
| CN113739195A (en) * | 2021-08-26 | 2021-12-03 | 上海发电设备成套设计研究院有限责任公司 | Method, device, equipment and medium for controlling coal feeding amount of separate bins |
| CN115098822A (en) * | 2022-06-28 | 2022-09-23 | 西安热工研究院有限公司 | Method for correcting power consumption of coal feeding system in overall performance test of coal-fired unit |
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