CN118129144A - Combustion feeding control strategy of biomass circulating fluidized bed boiler - Google Patents
Combustion feeding control strategy of biomass circulating fluidized bed boiler Download PDFInfo
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- CN118129144A CN118129144A CN202410449810.9A CN202410449810A CN118129144A CN 118129144 A CN118129144 A CN 118129144A CN 202410449810 A CN202410449810 A CN 202410449810A CN 118129144 A CN118129144 A CN 118129144A
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- hearth
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- 239000002028 Biomass Substances 0.000 title claims abstract description 65
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 18
- 238000011217 control strategy Methods 0.000 title claims abstract description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 89
- 239000001301 oxygen Substances 0.000 claims description 89
- 229910052760 oxygen Inorganic materials 0.000 claims description 89
- 239000000446 fuel Substances 0.000 claims description 37
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 21
- 239000003546 flue gas Substances 0.000 claims description 21
- 238000007599 discharging Methods 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 6
- 238000013459 approach Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000000779 smoke Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000010903 husk Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The invention discloses a combustion feeding control strategy of a biomass circulating fluidized bed boiler, which solves the problem that the output steam of the biomass circulating fluidized bed boiler is easy to fluctuate greatly.
Description
Technical Field
The invention relates to a combustion feed control method of a circulating fluidized bed, in particular to a combustion feed control strategy of a biomass circulating fluidized bed boiler.
Background
The biomass circulating fluidized bed boiler is a circulating fluidized bed boiler using biomass as fuel, and the biomass fuel comprises: biomass materials such as straw, rice husk, waste templates and the like; at present, most biomass circulating fluidized bed boiler feeding systems are generally fed by two-stage double-screw feeders, biomass fuel from a stock yard firstly enters a stokehold stock bin through a fuel conveying belt, the biomass fuel in the stokehold stock bin enters four parallel double-screw feeders of a first stage through a discharge hole, a second-stage double-screw feeder is connected to the discharge hole of each double-screw feeder of the first stage, and the second-stage double-screw feeder feeds the biomass fuel into a hearth; because biomass fuels are more in variety and have the characteristics of easy agglomeration and small specific gravity, the phenomenon that the boiler feeding is suddenly changed is frequent even though a two-stage screw feeder is adopted for feeding, so that the boiler is directly burnt to generate great fluctuation, the stability of the steam output of the boiler is seriously influenced, and how to stabilize the steam produced by the biomass circulating fluidized bed boiler becomes a difficult problem to be solved urgently; the two-stage double-screw feeder adopted by the feeding system of the existing biomass circulating fluidized bed boiler is driven by a variable-frequency speed-regulating motor, and the adjustment of the fuel feeding of the boiler is realized by adjusting the frequency of the variable-frequency speed-regulating motor, but the adjustment of the fuel feeding of the existing boiler is based on the steam quantity output by the boiler, the steam quantity output by the boiler is coupled with the frequency of the variable-frequency speed-regulating motor of the screw feeder, and the frequency of the variable-frequency speed-regulating motor is adjusted by the fluctuation of the steam quantity, so that the adjustment of the fuel feeding of the boiler is realized, and the steam quantity output by the boiler is stabilized; the traditional control strategy has the defect of delayed stable control of the boiler steam quantity, particularly, due to poor uniformity of biomass fuel feeding, after fluctuation of the boiler steam quantity occurs, the biomass fuel feeding is regulated, so that the problem of how to design a convenient boiler feeding control strategy to overcome the defect of great fluctuation of the output steam of the biomass circulating fluidized bed boiler is solved on site.
Disclosure of Invention
The invention provides a combustion feeding control strategy of a biomass circulating fluidized bed boiler, which solves the technical problem that the output steam of the biomass circulating fluidized bed boiler is easy to fluctuate greatly.
The invention solves the technical problems by the following technical proposal:
The general conception of the invention is as follows: the traditional control strategy of stabilizing the output steam quantity is realized by adjusting the frequency of a variable-frequency speed-regulating motor of a feeding system by the fluctuation of the steam quantity produced by a boiler, and the control strategy of stabilizing the steam quantity is realized by changing the frequency of the variable-frequency speed-regulating motor of the feeding system by the content of oxygen in a boiler hearth; the invention installs the oxygen content measuring sensor in the boiler tail flue, takes the reference value of the oxygen content in the flue gas measured by the sensor as the reference value of the frequency-conversion speed-regulating motor frequency of the feeding system, realizes the control of the combustion feeding of the biomass circulating fluidized bed boiler, creatively takes the change rate of the oxygen content in the flue gas and the feedforward coefficient of the oxygen change rate obtained in the debugging stage after the boiler is put into operation as the control input signal of the PID control module for controlling the frequency of the frequency-conversion speed-regulating motor, overcomes the defect that the output steam of the biomass circulating fluidized bed boiler is easy to fluctuate greatly, and provides a scientific and convenient and feasible control strategy for the feeding control of a plurality of double-screw feeders of the biomass circulating fluidized bed boiler.
A combustion feed control strategy of a biomass circulating fluidized bed boiler comprises a biomass circulating fluidized bed boiler system and a biomass fuel feed system, wherein a cyclone separator is connected to a hearth outlet of the biomass circulating fluidized bed boiler system, a superheater, an economizer and an air preheater are arranged on a discharge flue of the cyclone separator outlet, and a flue gas oxygen sensor is arranged on the discharge flue between the superheater and the economizer; the second-stage double-screw feeder of the biomass fuel feeding system is connected to the fuel feeding port of the hearth, the feeding port of the second-stage double-screw feeder is communicated with the discharging port of the first-stage double-screw feeder, and the feeding port of the first-stage double-screw feeder is communicated with the discharging port of the stokehold bin; the two-stage screw feeders are driven to feed through respective variable-frequency speed regulating motors; a distributed centralized control system DCS is arranged between the biomass circulating fluidized bed boiler system and the biomass fuel feeding system, a PID controller, an oxygen content rate change module and a human-machine interface HMI are respectively arranged in the distributed centralized control system, a variable-frequency speed regulator of a screw feeder is connected to the output end of the PID controller, a target parameter input port, a measurement parameter input port, a feedforward parameter input port and a limiting parameter input port are respectively arranged on the input end of the PID controller, the target parameter input port of the PID controller is connected with the human-machine interface HMI, and the output signal of a flue gas oxygen sensor is connected with the measurement parameter input port; the frequency of a variable-frequency speed regulating motor of a feeding system is regulated according to the content of oxygen in a boiler hearth, so that the stable control strategy of the steam production of the boiler is realized as follows:
Firstly, determining a target value of oxygen content in a boiler furnace according to the type of the fuel of the biomass circulating fluidized bed boiler and design parameters of the biomass circulating fluidized bed boiler, converting the target value into a flue gas oxygen content value of discharged smoke in a discharge flue between a superheater and an economizer, taking the flue gas oxygen content value as a reference target value SV O2 of the oxygen content in the boiler furnace, and inputting the reference target value SV O2 of the oxygen content in the boiler furnace into a PID controller through a man-machine interface;
And secondly, after the biomass circulating fluidized bed boiler is put into operation, dynamically acquiring an output signal of a flue gas oxygen sensor through a PID controller to obtain a real-time reference value PV O2 of the oxygen content in the hearth, comparing the real-time reference value PV O2 of the oxygen content in the hearth with a reference target value SV O2 of the oxygen content in the hearth to obtain a target deviation reference value err of the oxygen content in the hearth, taking the target deviation reference value err of the oxygen content in the hearth as an input proportional integral control value of the PID controller, calculating to obtain a PID control output value, taking the PID control output value as an operation instruction of a frequency converter of a first-stage screw feeder, and changing the feeding speed of the first-stage screw feeder, so that the real-time reference value PV O2 of the oxygen content in the hearth approaches the target value SV O2 of the oxygen content in the hearth, and the combustion trend of the combustion of the fuel in the hearth is stable, and the trend of the steam quantity produced by the boiler is ensured.
Four first-stage screw feeders of the biomass fuel feeding system are arranged in parallel, and the four first-stage screw feeders are arranged on a discharge hole of the same stokehold bin in parallel, and the initial frequency of a variable frequency motor of the first-stage screw feeder near the side of the bin wall of the stokehold bin is larger than that of the variable frequency motor of the first screw feeder near the middle of the bin discharge hole of the stokehold bin because the feeding amount of the first-stage screw feeder near the side of the bin wall of the stokehold bin is less than that of the first-stage screw feeder near the middle of the bin discharge hole of the stokehold bin; the frequency adjustment of the variable frequency motors of the four first-stage screw feeders is simultaneously operated and controlled by a PID controller.
The method comprises the steps of electrically connecting an input end of an oxygen content rate change module in a decentralized centralized control system with an output signal end of a flue gas oxygen sensor, connecting an output end of the oxygen content rate change module with a feedforward parameter input port of a PID controller, firstly debugging according to operation of a boiler in a commissioning debugging stage to obtain an oxygen change rate feedforward coefficient KOC, obtaining an oxygen change rate reference value SL in a hearth through the oxygen content rate change module after the boiler is put into operation, multiplying the oxygen change rate feedforward coefficient KOC by the oxygen change rate reference value SL to obtain a feedforward value OC, and superposing a proportional control operation result value err of an oxygen content target deviation reference value err in the hearth through the PID controller to obtain a PID control output value, and using the PID control output value as an operation instruction of a first-stage screw feeder frequency converter to change the feeding speed of the first-stage screw feeder.
According to the invention, the advanced detection of the combustion of the fuel in the hearth is realized through the change of the oxygen content, and the oxygen content change rate is particularly used as the control input value of the frequency change of the variable frequency motor in the biomass fuel feeding system, so that the great fluctuation of the combustion of the existing biomass circulating fluidized boiler is greatly reduced, the advanced supply regulation and control of the biomass fuel is explored, and the control method for outputting steam stability is realized.
Drawings
FIG. 1 is a schematic diagram of the configuration of a biomass circulating fluidized bed boiler system and biomass fuel feed system of the present invention;
FIG. 2 is a schematic diagram of the control principle structure of the biomass fuel feeding system of the present invention;
FIG. 3 is a schematic view of the structure of four first-stage screw feeders of the present invention arranged in parallel on the discharge ports of the same stokehold bin.
Detailed Description
The invention is described in detail below with reference to the attached drawing figures:
the combustion feed control strategy of the biomass circulating fluidized bed boiler comprises a biomass circulating fluidized bed boiler system and a biomass fuel feed system, wherein a cyclone separator 2 is connected to the outlet of a hearth 1 of the biomass circulating fluidized bed boiler system, a superheater 4, an economizer 5 and an air preheater 6 are arranged on a discharge flue 3 at the outlet of the cyclone separator, and a flue gas oxygen sensor 7 is arranged on the discharge flue between the superheater 4 and the economizer 5; the second-stage double-screw feeder 8 of the biomass fuel feeding system is connected to the fuel feeding port of the hearth, the feeding port of the second-stage double-screw feeder 8 is communicated with the discharging port of the first-stage double-screw feeder 9, and the feeding port of the first-stage double-screw feeder 9 is communicated with the discharging port of the stokehold bin 10; the screw feeders are driven to feed through respective variable-frequency speed-regulating motors 11; a distributed centralized control system DCS is arranged between the biomass circulating fluidized bed boiler system and the biomass fuel feeding system, a PID controller, an oxygen content rate change module and a human-machine interface HMI are respectively arranged in the distributed centralized control system DCS, a variable-frequency speed regulator 14 of a screw feeder is connected to the output end of the PID controller, a target parameter input port, a measurement parameter input port, a feedforward parameter input port and a limiting parameter input port are respectively arranged on the input end of the PID controller, the target parameter input port of the PID controller is connected with the human-machine interface HMI, and the output signal of a flue gas oxygen sensor is connected with the measurement parameter input port; the frequency of a variable-frequency speed regulating motor of a feeding system is regulated according to the content of oxygen in a boiler hearth, so that the stable control strategy of the steam production of the boiler is realized as follows:
Firstly, determining a target value of oxygen content in a boiler furnace according to the type of fuel of a biomass circulating fluidized bed boiler and design parameters of the biomass circulating fluidized bed boiler, converting the target value into a flue gas oxygen content value discharged in a discharge flue between a superheater and an economizer, taking the flue gas oxygen content value as a reference target value SV O2 of the oxygen content in the boiler furnace or taking a design value of the flue gas oxygen content value discharged in the discharge flue as a reference target value SV O2 of the oxygen content in the boiler furnace, and inputting the reference target value SV O2 of the oxygen content in the boiler furnace into a PID controller through a man-machine interface to be taken as a reference standard value of the oxygen content in the boiler furnace;
and secondly, after the biomass circulating fluidized bed boiler is put into operation, dynamically acquiring an output signal of a flue gas oxygen sensor through a PID controller to obtain a real-time reference value PV O2 of the oxygen content in the hearth, comparing the real-time reference value PV O2 of the oxygen content in the hearth with a reference target value SV O2 of the oxygen content in the hearth to obtain a target deviation reference value err of the oxygen content in the hearth, taking the target deviation reference value err of the oxygen content in the hearth as an input proportion control value of the PID controller, calculating to obtain a PID control output value, taking the PID control output value as an operation command AV2 of a frequency converter of a first-stage screw feeder, and changing the feeding speed of the first-stage screw feeder to realize the change of the feeding speed of the second-stage screw feeder, thereby realizing the adjustment of the feeding speed of the hearth, enabling the real-time reference value PV O2 of the oxygen content in the hearth to approach the target value SV O2 of the oxygen content in the hearth so as to achieve the trend of stable combustion of the fuel in the hearth and guarantee the trend of the steam quantity produced by the boiler.
Four first-stage screw feeders of the biomass fuel feeding system are arranged in parallel, and the four first-stage screw feeders are arranged on the discharge hole of the same stokehold bin in parallel, and the feeding amount of the first-stage screw feeder 12 close to the side of the bin wall of the stokehold bin is less than the discharging amount of the first-stage screw feeder 13 in the middle of the discharge hole of the bin of the stokehold bin, so that the initial frequency of the variable frequency motor of the first-stage screw feeder 12 close to the side of the bin wall of the stokehold bin is greater than the initial frequency of the variable frequency motor of the first screw feeder 13 in the middle of the discharge hole of the bin of the stokehold bin; the frequency adjustment of the variable frequency motors of the four first-stage screw feeders is simultaneously operated and controlled by a PID controller; the frequency adjustment of the variable frequency motor of each first-stage screw feeder is synchronous operation based on the initial frequency and is overlapped with the same amplitude.
The method comprises the steps of electrically connecting an input end of an oxygen content rate change module in a decentralized centralized control system with an output signal end of a flue gas oxygen sensor, connecting an output end of the oxygen content rate change module with a feedforward parameter input port of a PID controller, firstly obtaining an oxygen change rate feedforward coefficient KOC according to operation debugging of a boiler in a commissioning debugging stage, obtaining an oxygen change rate reference value SL in a hearth through the oxygen content rate change module after the boiler is put into operation, multiplying the oxygen change rate feedforward coefficient KOC by the oxygen change rate reference value SL to obtain a feedforward value OC, and superposing a proportional control operation result value err of an oxygen content target deviation reference value err in the hearth through the PID controller with the feedforward value OC to obtain a PID control output value, and using the PID control output value as an operation instruction of a first-stage screw feeder frequency converter for changing the feeding speed of the first-stage screw feeder 9; the feedforward value OC is used for correcting the operation instruction of the first-stage screw feeder frequency converter, so that timely and effective dynamic adjustment of the supply of the biomass fuel to the hearth is achieved.
Claims (3)
1. A combustion feed control strategy of a biomass circulating fluidized bed boiler comprises a biomass circulating fluidized bed boiler system and a biomass fuel feed system, wherein a cyclone separator (2) is connected to an outlet of a hearth (1) of the biomass circulating fluidized bed boiler system, a superheater (4), an economizer (5) and an air preheater (6) are arranged on a discharge flue (3) at the outlet of the cyclone separator, and a flue gas oxygen sensor (7) is arranged on the discharge flue between the superheater (4) and the economizer (5); a second-stage double-screw feeder (8) of a biomass fuel feeding system is connected to a fuel feeding port of the hearth, the feeding port of the second-stage double-screw feeder (8) is communicated with a discharging port of a first-stage double-screw feeder (9), and the feeding port of the first-stage double-screw feeder (9) is communicated with a discharging port of a stokehold bin (10); the screw feeders are driven to feed through respective variable-frequency speed-regulating motors (11); a distributed centralized control system (DCS) is arranged between the biomass circulating fluidized bed boiler system and the biomass fuel feeding system, a PID controller, an oxygen content rate change module and a human-machine interface (HMI) are respectively arranged in the distributed centralized control system (DCS), a variable-frequency speed regulator (14) of a screw feeder is connected to the output end of the PID controller, a target parameter input port, a measurement parameter input port, a feedforward parameter input port and a limiting parameter input port are respectively arranged on the input end of the PID controller, the target parameter input port of the PID controller is connected with the human-machine interface (HMI), and the output signal of a flue gas oxygen sensor is connected with the measurement parameter input port; the frequency of a variable-frequency speed regulating motor of a feeding system is regulated according to the content of oxygen in a boiler hearth, so that the stable control strategy of the steam production of the boiler is realized as follows:
Firstly, determining a target value of oxygen content in a boiler furnace according to the type of the fuel of the biomass circulating fluidized bed boiler and design parameters of the biomass circulating fluidized bed boiler, converting the target value into a flue gas oxygen content value of discharged smoke in a discharge flue between a superheater and an economizer, taking the flue gas oxygen content value as a reference target value SV O2 of the oxygen content in the boiler furnace, and inputting the reference target value SV O2 of the oxygen content in the boiler furnace into a PID controller through a man-machine interface;
And secondly, after the biomass circulating fluidized bed boiler is put into operation, dynamically acquiring an output signal of a flue gas oxygen sensor through a PID controller to obtain a real-time reference value PV O2 of the oxygen content in the hearth, comparing a reference target value SV O2 of the oxygen content in the boiler hearth with a real-time reference value PV O2 of the oxygen content in the hearth to obtain a target deviation reference value err of the oxygen content in the hearth, taking the target deviation reference value err of the oxygen content in the hearth as an input proportional integral control value of the PID controller, calculating to obtain a PID control output value, taking the PID control output value as an operation command AV2 of a frequency converter of a first-stage screw feeder, and changing the feeding speed of the first-stage screw feeder, so that the real-time reference value PV O2 of the oxygen content in the hearth approaches the target value SV O2 of the oxygen content in the hearth, and the combustion trend of the oxygen content in the hearth is stable, and the trend of the steam quantity produced by the boiler is ensured.
2. The biomass circulating fluidized bed boiler combustion feed control strategy according to claim 1, wherein four first-stage screw feeders are arranged in parallel, and the four first-stage screw feeders are arranged on the discharge hole of the same stokehold bin in parallel, and because the feeding of the first-stage screw feeder (12) near the side of the bin wall of the stokehold bin is less than the discharging of the first-stage screw feeder (13) in the middle of the discharge hole of the bin of the stokehold bin, the initial frequency of the variable frequency motor of the first-stage screw feeder (12) near the side of the bin wall of the stokehold bin is greater than the initial frequency of the variable frequency motor of the first screw feeder (13) in the middle of the discharge hole of the bin of the stokehold bin; the frequency adjustment of the variable frequency motors of the four first-stage screw feeders is simultaneously operated and controlled by a PID controller.
3. The biomass circulating fluidized bed boiler combustion feed control strategy according to claim 1 or 2, wherein an input end of an oxygen content rate change module in a decentralized centralized control system is electrically connected with an output signal end of a flue gas oxygen sensor, an output end of the oxygen content rate change module is connected with a feed-forward parameter input port of a PID controller, an oxygen change rate feedforward coefficient KOC is obtained according to operation debugging in a boiler operation debugging stage, after the boiler is put into operation, an oxygen change rate reference value SL in a furnace is obtained through the oxygen content rate change module, the oxygen change rate feedforward coefficient KOC is multiplied by the oxygen change rate reference value SL to obtain a feedforward value OC, then a proportional control operation result value err of the oxygen content target deviation reference value err in the furnace is overlapped with the feedforward value OC through a PID controller to obtain a PID control output value, and the PID control output value is used as an operation command of a first-stage screw feeder frequency converter to change the feed speed of a first-stage screw feeder (9).
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| CN202410449810.9A CN118129144A (en) | 2024-04-15 | 2024-04-15 | Combustion feeding control strategy of biomass circulating fluidized bed boiler |
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| CN202410449810.9A CN118129144A (en) | 2024-04-15 | 2024-04-15 | Combustion feeding control strategy of biomass circulating fluidized bed boiler |
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