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CN-122015120-A - Boiler stable combustion energy-saving control method under deep peak regulation of unit

CN122015120ACN 122015120 ACN122015120 ACN 122015120ACN-122015120-A

Abstract

The invention relates to the technical field of stable combustion control, in particular to a boiler stable combustion energy-saving control method under deep peak shaving of a unit, which comprises the following steps: the method comprises the steps of collecting flame radiation and flue gas temperature signals of a hearth to generate a heat release characteristic set, calculating radial gradient differences of central transitional adherence areas of the same cross section to form a heat release gradient sequence, screening and generating a target adjusting layer position by a multi-layer sensing machine, generating a stable combustion energy-saving control instruction by combining the circumferential gradient and the opening swirl vane angle of an air door, and outputting an optimized stable combustion energy-saving control instruction through state estimation optimization.

Inventors

  • DU GAOFENG
  • CHEN KUNMING
  • CHENG LIMIN
  • CHEN ZEEN
  • SUN ZHAOPENG

Assignees

  • 江西赣能股份有限公司

Dates

Publication Date
20260512
Application Date
20260311

Claims (10)

  1. 1. The boiler stable combustion energy-saving control method under the deep peak regulation of the unit is characterized by comprising the following steps of: s1, acquiring output voltage signals of a boiler furnace flame radiation and smoke temperature sensor, performing analog-to-digital conversion and discrete sampling, extracting radiation intensity and smoke temperature under the same space coordinate, and performing weighted coupling calculation by combining a preset dimension conversion coefficient to generate a heat release characteristic set; s2, extracting heat release characterization values of the same cross section center, the wall attachment and the transition region in the heat release characterization set, calculating and combining a radial outside gradient difference and a radial inside gradient difference, and constructing a heat release gradient sequence; S3, extracting a plurality of radial inner gradient differences and radial outer gradient differences of the sections based on the heat release gradient sequence, inputting the radial inner gradient differences and the radial outer gradient differences into a multi-layer perceptron model for characteristic horizon screening, extracting row first section coordinates output by the characteristic horizon screening, and generating a target adjustment horizon; And S4, calculating a plurality of azimuth circumferential gradient difference sequences based on the target adjusting layer corresponding to a plurality of adjacent azimuth heat release characterization values with the same cross section, extracting the current opening of the corresponding azimuth air door actuating mechanism and the current angle of the cyclone blade adjusting motor, reducing the opening value of the air door actuating mechanism and increasing the angle value of the cyclone blade adjusting motor, and respectively and independently encoding and combining the adjusted values to generate a stable combustion energy-saving control instruction.
  2. 2. The method for controlling stable combustion and energy saving of a boiler under unit depth peak shaving according to claim 1, wherein the heat release characterization set comprises a radiation intensity product, a temperature coupling heat intensity and a heat release value corresponding to space coordinates, the heat release gradient sequence comprises a radial inner gradient difference, a radial outer gradient difference and a section gradient combination, the target adjusting horizon comprises a priority adjusting section coordinate, a combustion characteristic horizon number and an adjusting horizon space position, and the stable combustion and energy saving control instruction comprises an air door executing mechanism adjusting opening degree and a swirl vane adjusting motor adjusting angle.
  3. 3. The method for controlling stable combustion and energy saving of the boiler under the unit depth peak shaving according to claim 1, wherein the specific steps of S1 are as follows: S101, mapping continuous voltage amplitude values into a digital amplitude value sequence and performing discrete sampling by acquiring voltage signals output by a hearth flame radiation sensor and voltage signals output by a smoke temperature sensor and performing analog-to-digital conversion, and performing time alignment and combination on radiation at multiple sampling moments and the amplitude values of the temperature sensor to obtain a radiation temperature sampling sequence; S102, based on the radiation temperature sampling sequence, calling a multi-sampling point space coordinate identifier, converting the amplitude of the radiation sensor and the amplitude of the temperature sensor into smoke temperature and radiation intensity, and carrying out pairing combination on the radiation intensity value and the smoke temperature value under the same space coordinate index to obtain a space coordinate double-parameter set; and S103, extracting multi-coordinate index associated radiation intensity and flue gas temperature according to the space coordinate double-parameter set, introducing a dimensionless coefficient to combine and multiply the normalized product of the radiation intensity and the flue gas temperature, and integrating all product output and space coordinate index labels to generate a heat release sign set.
  4. 4. The method for controlling stable combustion and energy saving of the boiler under the unit depth peak shaving according to claim 1, wherein the specific steps of S2 are as follows: S201, acquiring heat release characterization values of the same cross section center and transition region in the heat release characterization set, performing difference operation on the heat release values of the center position and the transition position according to the radial coordinate sequence of the cross section, and arranging according to the radial coordinate sequence to generate a gradient difference sequence on the radial inner side; s202, acquiring an adherence region heat release characterization value based on the heat release characterization set, calculating a radial outside difference value data sequence by using a difference value between a transition region and the adherence region heat release value according to a radial coordinate sequence, and calling a radial inside gradient difference value sequence to perform sequential verification to obtain a radial outside gradient difference value sequence; s203, calling the gradient difference sequence on the radial inner side and the gradient difference sequence on the radial outer side, performing sequence splicing operation according to the unified radial position index, and continuously arranging two groups of gradient difference data to generate a heat release gradient sequence.
  5. 5. The method for controlling stable combustion and energy saving of the boiler under the unit depth peak shaving according to claim 1, wherein the specific steps of S3 are as follows: S301, extracting a plurality of section radial inner gradient differences and radial outer gradient differences based on the heat release gradient sequence, calling the radial outer gradient differences at the same coordinate position to perform difference amplitude comparison, recording gradient difference amplitude values at multiple section positions, and performing serialization coding according to the section coordinate sequence to generate a section gradient difference amplitude sequence; S302, extracting multi-section gradient difference amplitude according to the section gradient difference amplitude sequence, screening feature horizons through a multi-layer perceptron model to extract a to-be-selected horizon set, screening section coordinate indexes and amplitudes of the to-be-selected horizon set, wherein the screening amplitudes of the section coordinate indexes and the amplitudes exceed a preset gradient amplitude threshold, and arranging the section coordinate indexes and the amplitudes in descending order to generate a candidate horizon arrangement sequence; s303, calling the candidate horizon ranking sequence to perform ranking index retrieval, extracting a cross-section coordinate index with the ranking position at the first position, calling corresponding space horizon parameters, performing horizon identification coding, converting the coded horizon parameters into a control end callable coordinate horizon instruction format, and obtaining a target adjustment horizon.
  6. 6. The method for controlling stable combustion and energy saving of the boiler under deep peak shaving of the unit according to claim 5, wherein the gradient amplitude threshold is determined by extracting multi-section gradient amplitude sampling values in a heat release gradient data set, carrying out statistical distribution operation on the sampling value sequence, obtaining a gradient amplitude mean value and a gradient amplitude variance, carrying out weighted summation to calculate a gradient fluctuation reference component, and carrying out product operation by combining a preset sensitivity coefficient.
  7. 7. The method for controlling stable combustion and energy saving of the boiler under the unit depth peak shaving according to claim 1, wherein the specific steps of S4 are as follows: S401, acquiring heat release characterization values of the target adjustment horizon corresponding to four adjacent orientations of the same cross section, performing clockwise subtraction to calculate a plurality of orientation circumferential gradient difference sequences, calling numerical relations among the four adjacent orientation heat release characterization values to perform circumferential gradient attribution operation, and establishing an orientation circumferential gradient difference sequence; S402, extracting the current opening of a corresponding azimuth air door actuating mechanism and the current angle of a swirl vane adjusting motor based on the azimuth circumferential gradient difference value sequence, reducing the air door opening value, and increasing the angle value of the swirl vane adjusting motor to generate an air door opening and vane angle adjusting value set; S403, carrying out numerical integration and combination on the throttle opening and the blade angle adjustment value set, calling accumulated information of multi-azimuth opening and angle adjustment values to carry out summarization operation, and establishing a stable combustion energy-saving control instruction.
  8. 8. The method for controlling stable combustion and energy saving of a boiler under deep peak shaving of a unit according to claim 1, further comprising: S5, extracting a target opening value of the air door executing mechanism and a target angle value of the cyclone blade adjusting motor based on the stable combustion energy-saving control instruction, performing state pre-estimation calculation, replacing the target opening value of the air door executing mechanism and the target angle value of the cyclone blade adjusting motor based on the state pre-estimation value, and constructing an optimized stable combustion energy-saving control instruction; The optimized stable combustion energy-saving control instruction comprises a predicted opening degree of an air door executing mechanism, a predicted angle of a swirl vane adjusting motor and a predicted correction amount of a control state.
  9. 9. The method for controlling stable combustion and energy saving of the boiler under the unit depth peak shaving of claim 8, wherein the specific steps of S5 are as follows: s501, extracting a target opening value of an air door executing mechanism and a target angle value of a swirl vane adjusting motor based on the combustion stabilizing energy-saving control instruction, combining and mapping, respectively carrying out differential operation on an adjacent angle variation and an adjacent opening variation on the opening value and the angle value, and carrying out same-frequency data alignment to generate an air door swirl cooperative parameter set; S502, carrying out state estimation operation based on the air door rotational flow cooperative parameter set, respectively carrying out independent sliding interval summation on an opening degree continuous change trend sequence and an angle continuous change trend sequence, respectively calculating opening degree and angle interval state amplitude values, and comparing the opening degree and angle interval state amplitude values with a preset fluctuation threshold value to obtain an air door rotational flow estimation state set; S503, based on the air door rotational flow estimated state group and the stable combustion energy-saving control instruction, extracting a target opening value of an air door executing mechanism corresponding to the inside of the instruction and a target angle value of a rotational flow blade adjusting motor, performing numerical replacement operation, and performing sequential recombination on replacement parameters to generate an optimized stable combustion energy-saving control instruction.
  10. 10. The method for controlling stable combustion and energy saving of the boiler under deep peak shaving of a unit according to claim 9, wherein the fluctuation threshold value is determined by weighting and summing after obtaining amplitude fluctuation statistics of a heat release gradient sequence under stable combustion working condition and converting a distribution standard deviation of a mechanical response error extremum and a heat release characterization value into a dimensionless coefficient by introducing a dimensionless processing module.

Description

Boiler stable combustion energy-saving control method under deep peak regulation of unit The invention relates to the technical field of stable combustion control, in particular to a boiler stable combustion energy-saving control method under deep peak shaving of a unit. Background The technical field of stable combustion control mainly relates to a control technology for regulating and managing the fuel and air supply states of a combustion device under different working conditions so as to maintain the continuous and stable combustion process, which is widely applied to the operation process of power station boilers, industrial kilns and coal-fired gas-fuel combustion equipment, and the core matters comprise the content of fuel supply quantity regulation, primary air and secondary air ratio regulation, furnace negative pressure maintenance, burner operation mode switching, combustion flame stability regulation and the like, by carrying out coordinated control on the operation parameters such as the coal feeding amount of the coal feeder, the air quantity of the air feeder and the induced draft fan, the opening degree of the air door, the start-stop sequence of the burner and the like, the combustion process can keep stable operation under different load conditions, and the operation requirements such as unit load change, fuel quality change, furnace thermal state change and the like are met. The traditional boiler stable combustion energy-saving control method under deep peak regulation of the unit refers to a type of operation mode for controlling the boiler combustion process in order to prevent unstable flame or flameout of a furnace in the low-load or deep peak regulation operation process of the thermal power unit, and is generally characterized in that the coal feeding amount of a coal feeder is reduced, partial burners are stopped according to a preset sequence, the air quantity ratio of a primary fan to a secondary fan is regulated, the number of coal mill operation units is changed, the opening degree of a secondary air baffle is regulated, the negative pressure range of the furnace is maintained, an oil gun or a plasma ignition device is started to maintain the flame of the furnace when necessary, and the combustion operation requirement of the unit under the low-load or deep peak regulation working condition is adapted by carrying out combined regulation on the operation states of the coal feeding equipment, the coal grinding equipment, the air supply equipment and the burners in the boiler combustion system. In the prior art, in the deep peak regulation or low-load operation process, the combustion process control mainly depends on the combined regulation of equipment such as a coal feeder, a blower, a burner, a secondary air baffle and the like, the response of a control means to the combustion state is mainly based on empirical rules and fixed proportion regulation, and the real-time analysis and quantitative evaluation of heat release distribution characteristics of different sections and directions in a hearth are lacked, so that the perception lag of unstable local flame or abnormal combustion is caused, the fine control of the combustion process cannot be realized, the stable combustion and the energy-saving effect are difficult to be considered, and meanwhile, the delay and unbalance phenomenon exist in the regulation response when the fuel property changes or the thermal state of the hearth fluctuates, the local overfire or flameout risk is caused, and the operation safety and the combustion efficiency of a unit are influenced. Disclosure of Invention In order to achieve the purpose, the invention adopts the following technical scheme that the boiler stable combustion energy-saving control method under unit depth peak shaving comprises the following steps: s1, acquiring output voltage signals of a boiler furnace flame radiation and smoke temperature sensor, performing analog-to-digital conversion and discrete sampling, extracting radiation intensity and smoke temperature under the same space coordinate, and performing weighted coupling calculation by combining a preset dimension conversion coefficient to generate a heat release characteristic set; s2, extracting heat release characterization values of the same cross section center, the wall attachment and the transition region in the heat release characterization set, calculating and combining a radial outside gradient difference and a radial inside gradient difference, and constructing a heat release gradient sequence; S3, extracting a plurality of radial inner gradient differences and radial outer gradient differences of the sections based on the heat release gradient sequence, inputting the radial inner gradient differences and the radial outer gradient differences into a multi-layer perceptron model for characteristic horizon screening, extracting row first section coordinates output by the characteristic horizon screening, and gen