CN115371043B - A combustion optimization control method based on boiler CT technology - Google Patents
A combustion optimization control method based on boiler CT technology Download PDFInfo
- Publication number
- CN115371043B CN115371043B CN202110557835.7A CN202110557835A CN115371043B CN 115371043 B CN115371043 B CN 115371043B CN 202110557835 A CN202110557835 A CN 202110557835A CN 115371043 B CN115371043 B CN 115371043B
- Authority
- CN
- China
- Prior art keywords
- group
- burner
- boiler
- section
- value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
- F23C5/08—Disposition of burners
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/02—Regulating fuel supply conjointly with air supply
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/003—Systems for controlling combustion using detectors sensitive to combustion gas properties
- F23N5/006—Systems for controlling combustion using detectors sensitive to combustion gas properties the detector being sensitive to oxygen
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
本发明涉及一种基于锅炉CT技术的燃烧优化控制方法，包括：燃烧器分组、温度采集、温度比对和燃烧器调整等步骤。本发明提供的基于锅炉CT技术的燃烧优化控制方法，解决了锅炉燃烧调整过程中因锅炉燃烧偏差以及由此产生的温度偏差难以实时控制以及自动控制的技术难题。
The present invention relates to a combustion optimization control method based on boiler CT technology, comprising the steps of burner grouping, temperature acquisition, temperature comparison and burner adjustment. The combustion optimization control method based on boiler CT technology provided by the present invention solves the technical problem that the boiler combustion deviation and the resulting temperature deviation are difficult to control in real time and automatically during the boiler combustion adjustment process.
Description
Technical Field
The invention relates to a combustion optimization control method based on a boiler CT technology, and belongs to the technical field of boilers.
Background
At present, the boiler combustion control of the thermal power generating unit in China mostly realizes automatic operation, and the combustion load can be automatically changed according to the load change of the unit in the operation of the boiler. In the automatic coordination mode of 'boiler following machine', the steam turbine controls the power generation load, the boiler combustion system controls the main steam pressure, when the set value of the main steam pressure deviates from the actual value, the DCS boiler combustion automatic control loop sends out an adjusting instruction, and the boiler fuel and the corresponding air distribution are adjusted in time, so that the stability of the boiler load is maintained.
For the boilers of most thermal power plants, there are a plurality of burners, exemplified by a certain full-fired gas boiler. The combustion adjustment and the air distribution adjustment of the plurality of combustors are independent. The burners at the same vertical height are the same-layer burners, and the burners at the same wall surface and the same vertical height are the same-group burners.
The boiler combustion system is provided with a gas regulating valve and a gas branch regulating valve, the same-layer valve group of the boiler combustion system receives a regulating instruction sent by a boiler combustion automatic control loop regulator and transmits the regulating instruction to each branch regulating valve through a regulating valve layer operator, so that the branch regulating valves are kept at the same opening.
The boiler combustion system is also provided with an air quantity regulating valve and an air quantity branch pipe regulating valve. The blowers are arranged in double rows, and the air supply of the boiler is realized by changing the output of the two blowers according to the oxygen content of the flue gas of the horizontal flue and a proper air-coal ratio, so that the boiler is economically combusted. After the air from two sides is heated by the air preheater, the air is sent into the burner by the air quantity regulating valve and the air quantity branch pipe regulating valve, and the valve group instruction distribution principle is consistent with that of the gas regulating valve group.
The automatic input of boiler burning and amount of wind have alleviateed operating personnel's operation burden. However, as the boiler operating time increases, the fuel quantity, air quantity and burner structural deviation between the respective burners are continuously deteriorated. The small deviation can be accumulated and increased along with the extension of the operation time of the boiler, and finally the temperature deviation of the burner area is increased when the boiler is operated, so that the boiler smoke generates larger deviation, the deviation of the heating surface of the boiler is increased, the deviation of the radiation convection heating surface is also increased, the opening deviation of the water spraying attemperator at the two sides of the boiler is increased, the service life loss of the heating surface is increased, and the safe operation of the boiler is affected seriously.
Therefore, for the boiler with the combustion system, a targeted measure is needed to reduce the thermal deviation of the heating surface of the boiler according to the thermal deviation condition of the boiler, and the thermal deviation is controlled in a controllable range as much as possible, so that the safe operation time and the service life of the boiler are prolonged. Traditionally, operators often carry out manual combustion adjustment according to the temperature deviation of the rear end flue gas in the boiler flue gas edge process, and the adjustment effect is poor. Particularly, in the process of greatly and repeatedly changing the boiler load, the hysteresis of the adjustment mode is more obvious, and the aim of timely reducing the heat deviation of the boiler is difficult to achieve. Theoretically, the adjustment of the thermal deviation based on the temperature of the burner region is more timely, and the thermal deviation is more convenient to control in time from the front end of the flue gas path.
Disclosure of Invention
The invention aims to solve the technical problems by overcoming the defects of the technology and providing a method for designing a burner leveling optimization control strategy, an optimal total air volume control strategy and an air door leveling optimization control strategy by utilizing temperature field distribution data obtained by a boiler CT, realizing automatic leveling of a boiler burner area temperature field, further realizing automatic leveling of boiler combustion, reducing flue gas along-path heat deviation, reducing heat deviation of a boiler heating surface and realizing boiler combustion optimization adjustment.
In order to solve the technical problems, the technical scheme provided by the invention is that the combustion optimization control method based on the boiler CT technology comprises the following steps:
the method comprises the steps of 1, dividing burners which are positioned on the same furnace wall of a boiler and have consistent heights into a group in a first grouping mode, and dividing the burners into a left burner group and a right burner group by taking the central line of the boiler in the front-back direction as an axis in a second grouping mode;
Step 2, each group after the first grouping mode in the step 1 and each group after the second grouping mode are subjected to one-to-one intersection;
Step 3, leveling the gas of the same group of burners, taking a group of burners after a first grouping mode, reading the temperature field information of the burner groups, comparing the left temperature characterization value TiLavg with the right temperature characterization value TiRavg, if the left temperature characterization value TiLavg is consistent with the right temperature characterization value TiRavg, not adjusting, if TiLavg is more than TiRavg, adjusting the gas valve of the burner after intersecting with the left burner group in the group, and simultaneously adjusting the gas valve of the burner after intersecting with the right burner group in the group, if TiLavg is less than TiRavg, adjusting the gas valve of the burner after intersecting with the left burner group in the group, and simultaneously adjusting the gas valve of the burner after intersecting with the right burner group in the group, and repeating the step until all the burner groups in the first grouping mode are adjusted;
Step 4, leveling the burner gas of the same layer, taking all groups with the same height in a first grouping mode, reading the temperature field information of each group, averaging the left temperature characterization value and the right temperature characterization value of each group, if the average value of each group is consistent, not adjusting, if the average value of each group is inconsistent, adjusting the gas valve of the burner group with the small average value, and simultaneously adjusting the gas valve of the burner group with the large average value;
Step 5, leveling the air quantity of the same group of burners, taking a group of burners after a first grouping mode, reading information of an oxygen quantity field, comparing a left oxygen quantity representation value OiLavg with a right oxygen quantity representation value OiRavg, if the left oxygen quantity representation value OiLavg is consistent with the right oxygen quantity representation value OiRavg, not adjusting, if OiLavg is larger than OiRavg, adjusting the air quantity valve of the burner after intersecting with the left burner group in the group, and simultaneously adjusting the air quantity valve of the burner after intersecting with the right burner group in the group, if OiLavg is smaller than OiRavg, adjusting the air quantity valve of the burner after intersecting with the left burner group in the group, and simultaneously adjusting the air quantity valve of the burner after intersecting with the right burner group in the group;
step 6, leveling the air quantity of the same-layer burner, taking all groups with the same height in a first grouping mode, reading the information of an oxygen quantity field of each group, averaging the representation value of the left oxygen quantity of each group with the representation value of the right oxygen quantity of each group, if the average value of each group is consistent, not adjusting, if the average value of each group is inconsistent, adjusting the air quantity valve of the burner group with the small average value, simultaneously adjusting the gas valve of the burner group with the large average value, and repeating the step until all groups with the first grouping mode are adjusted.
The scheme is further improved in that in the step 3, the adjustment quantity of the gas valve which is adjusted to be large is the same as that of the gas valve which is adjusted to be small at the same time, and the adjustment directions are opposite.
The scheme is further improved in that in the step 3, a PID regulator is used for regulating a gas valve, the difference between TiLavg and TiRavg is divided into four sections, the first section is more than 0 and less than or equal to 10 ℃, the second section is more than 10 and less than or equal to 25 ℃, the third section is more than 25 and less than or equal to 40 ℃, the fourth section is more than 40 ℃, the proportional coefficient, the integral coefficient and the differential coefficient of the PID regulator are set to be [ a, b, c ], when the difference between TiLavg and TiRavg is in the first section, [ a, b, c ] = [1,0.8,0], when the difference is in the second section, [ a, b, c ] = [1, 0]; when the difference is in the third section, [ a, b, c ] = [ 1.3,1.1,0], and when the difference is in the fourth section, [ a, b, c ] = [1.4,1.1,0].
The scheme is further improved in that in the step 4, the adjustment quantity of the gas valve which is adjusted to be large is the same as that of the gas valve which is adjusted to be small at the same time, and the adjustment directions are opposite.
The scheme is further improved in the step 4, a PID regulator is used for regulating the gas valve, the average value difference is divided into four sections, the first section is more than 0 and less than or equal to 10 ℃, the second section is more than 10 and less than or equal to 25 ℃, the third section is more than 25 and less than or equal to 40 ℃, the fourth section is more than 40 ℃, the proportional coefficient, the integral coefficient and the differential coefficient of the PID regulator are set to be [ a, b, c ], when the average value difference is in the first section, [ a, b, c ] = [1,0.9,0], when the average value difference is in the second section, [ a, b, c ] = [1.1,1,0], when the average value difference is in the third section, [ a, b, c ] = [ 1.3,1.2,0], and when the average value difference is in the fourth section, [ a, b, c ] = [1.4,1.2,0].
The scheme is further improved in that according to the boiler performance data analysis and the boiler combustion adjustment test, the optimal temperature field data corresponding to the boiler in different load sections is obtained. When the boiler can burn in the working condition of the optimal temperature field, the air distribution of the boiler is in the optimal matching state. The method comprises the steps of measuring and recording total air quantity of blowers on two sides of a boiler, utilizing an optimal total air quantity model to replace an oxygen quantity correction model in actual operation of the boiler, inputting the optimal total air quantity model into a boiler load, automatically outputting the corresponding optimal total air quantity in a linear broken line function mode, taking the optimal total air quantity as a target value for controlling the output of the blowers, obtaining an air distribution instruction which is more accurate than the oxygen quantity correction, further providing a basic opening instruction for air quantity adjustment of each layer of burner, simultaneously introducing main steam pressure into an air supply PID regulator as a feedforward signal, ensuring that the air quantity is timely adjusted when the working condition of the boiler changes, and maintaining the stability of the air quantity and gas quantity ratio.
The scheme is further improved in that the air supply PID feedforward setting is specifically that the main steam pressure is obtained in real time, a numerical analysis algorithm is adopted, the change rate of the main steam pressure per minute is calculated, whether the main steam pressure exceeds a preset value a0 or is lower than a preset value a1 is judged, if the main steam pressure exceeds the preset value a0, the feedforward gain coefficient K=kmax, if the main steam pressure exceeds the preset value a1, the feedforward gain coefficient K=kmin, otherwise, the feedforward gain coefficient K= Knor is multiplied by the feedforward gain coefficient K to serve as a feedforward signal of PID and jointly act on the control output of the air supply transducer.
A further improvement of the above scheme is that a0=0.6, a1=0.2, the feedforward gain coefficient K varies over [0.1,0.2], when the main steam pressure variation rate per minute is greater than 0.6Mpa, k=kmax=0.2, when the main steam pressure variation rate per minute is less than 0.2Mpa, k=kmin=0.1, otherwise k= Knor =0.15.
The combustion optimization control method based on the boiler CT technology solves the technical problems that the boiler combustion deviation and the temperature deviation generated by the boiler combustion deviation are difficult to control in real time and automatically control in the boiler combustion adjustment process, and the heat deviation is controlled in time directly from the front end of the flue gas path, so that the response is in time. The traditional boiler combustion automatic control can only send out burner co-operation instructions according to unit requirements, and independent fuel accurate matching and air supply accurate matching can not be carried out on each branch burner. Compared with the traditional control method, the invention firstly provides the control leveling of the corresponding valve group when the boiler combustion has smaller deviation by taking the boiler burner area temperature field signal and the oxygen quantity signal measured by the boiler CT as signals for controlling the boiler combustion deviation, thereby not only slowing down or eliminating the continuous expansion of the boiler combustion deviation, but also ensuring that the oxygen quantity does not have large deviation, and further ensuring that the boiler fuel can be burnt economically.
Drawings
Fig. 1 is a schematic view of an application scenario of a preferred embodiment of the present invention.
Fig. 2 is a schematic view of the lower burner structure of fig. 1.
Fig. 3 is a schematic view of the automatic control mode of the boiler of fig. 1.
Detailed Description
Examples
According to the combustion optimization control method based on the boiler CT technology, N multiplied by N measurement grids are arranged on a hearth cross section channel, N pairs of measurement probes are arranged on a boiler water-cooled wall, holes are formed in the water-cooled wall fins to serve as laser measurement channels, the average temperature of N measurement paths is obtained, a CT imaging technology inversion algorithm is adopted, the value of a corresponding channel intersection is calculated, hearth distribution reproduction of a temperature field is achieved through the algorithm, and finally hearth temperature field data and images are obtained.
The plum steel 4# boiler will be described below as an example. As shown in figures 1 and 2, the boiler is provided with 6 burners on the front wall and the rear wall, each burner is provided with a corresponding gas branch pipe regulating valve and a corresponding air quantity branch pipe regulating valve, so that independent regulation of each burner is realized, and meanwhile, 3 burners positioned on the same wall and at the same height are synchronously controlled by the gas regulating valve and the air quantity regulating valve. The boiler is controlled by a DCS system, and a gas branch pipe regulating valve, an air quantity branch pipe regulating valve, a gas regulating valve and an air quantity regulating valve are controlled by a PID regulator.
The method specifically comprises the following steps:
The first grouping mode is to divide the burners which are positioned on the same furnace wall of the boiler and have the same height into one group, namely, divide the burners in the embodiment into four groups of front upper, front lower, rear upper and rear lower, each group is 3 burners, and the second grouping mode is to divide the burners into a left burner group and a right burner group by taking the central line of the boiler in the front-rear direction as an axis, and the middle burner is just positioned on the central line, so that the burners are excluded.
The method comprises the steps of step 2, carrying out one-to-one intersection on each group after the first grouping mode and each group after the second grouping mode in the step 1, obtaining a first front upper burner, a third front upper burner, a first rear upper burner, a third rear upper burner, a front lower burner 1f, a front lower burner 3f, a rear lower burner 1b and a rear lower burner 3b, collecting temperature field information and oxygen field information of the areas where the burners are located in the obtained intersection through a boiler CT system, communicating to a DCS system through a 485 communication mode, designing a communication monitoring function, wherein the communication monitoring function has the advantages that when communication is abnormal, a temperature field signal and an oxygen field signal transmitted to the DCS system by the boiler CT system can automatically keep the numerical value before the communication abnormality, and giving out a communication abnormality alarm prompt.
The method comprises the steps of (3) leveling the gas of the same group of burners, taking a group of burners after a first grouping mode, reading temperature field information of the same group of burners, removing data which deviate from a design process obviously, adopting a clustering analysis method for the rest data, carrying out clustering data analysis on the temperature of the same side to obtain a temperature signal which can most represent the combustion condition of the combustion area at the same side, carrying out Kalman filtering processing on the data to eliminate signal jump, avoiding influence of signal jump on adjustment combustion optimization, grasping the change condition of the temperature field of the area, realizing prejudgment of temperature field change, comparing a left temperature characterization value TiLavg with a right temperature characterization value TiRavg, if the left temperature characterization value is consistent with the right temperature characterization value, not adjusting, if TiLavg is larger than TiRavg, adjusting the gas valves of the burners after intersection with the left burner group in the group, and simultaneously adjusting the gas valves of the burners after intersection with the right burner group in the group, if TiLavg is smaller than TiRavg, and repeating all the steps of adjustment until the first grouping mode is completed.
Taking the previous upper burner group as an example, comparing T1Lavg of the first upper burner with T1Ravg of the third upper burner, if the two are inconsistent, the PID regulator outputs a regulating command OP1z which only represents a regulating quantity and has no direction, if T1Lavg > T1Ravg, regulating optimizing command OP1 zl=OP1z (-1) for the first upper gas branch regulating valve, regulating direction is expressed by a negative value, namely small, and regulating direction is expressed by a positive value, namely small, for the third upper gas branch regulating valve, if T1Lavg < T1Ravg, regulating optimizing command OP1 zl=OP1z (-1) for the first upper gas branch regulating valve, and regulating optimizing command OP1 zr=OP1z (-1) for the third upper gas branch regulating valve.
In order to realize faster and more accurate adjustment, the difference between T1Lavg and T1Ravg is divided into four sections, wherein the first section is more than 0 and less than or equal to 10 ℃, the second section is more than 10 and less than or equal to 25 ℃, the third section is more than 25 and less than or equal to 40 ℃, and the fourth section is more than 40 ℃, the proportional coefficient, the integral coefficient and the differential coefficient of the PID regulator are set to be [ a, b, c ], when the difference between T1Lavg and T1Ravg is in the first section, [ a, b, c ] = [1,0.8,0], when the difference is in the second section, [ a, b, c ] = [1, 0], when the difference is in the third section, [ a, b, c ] = [ 1.3,1.1,0], and when the difference is in the fourth section, [ a, b, c ] = [1.4,1.1,0], so that different adjustment instructions OP1z, namely different adjustment amounts are obtained.
The other three groups of burners are consistent in adjustment mode and are not repeated.
The same group of burner gas leveling is based on the automatic combustion adjustment shown in fig. 3, and needs to be put into use under the condition of automatic boiler combustion input. And the results of the same group of burner gas leveling combustion optimization are used as offset and superimposed on the automatic instructions of the corresponding burner gas branch pipe regulating valves, and finally participate in a combustion regulation large closed-loop control loop taking main steam pressure as a regulating object.
Step 4, leveling the burner gas in the same layer, taking all groups with the same height in a first grouping mode, reading the temperature field information of each group, averaging the left temperature characterization value and the right temperature characterization value of each group, if the averages of each group are consistent, not adjusting, if the averages of each group are inconsistent, adjusting the gas valves of the burner groups with small averages, simultaneously adjusting the gas valves of the burner groups with large averages, and repeating the step until all the groups with the first grouping mode are adjusted.
In this case, the front upper part and the rear upper part are groups of the same height, and the front lower part and the rear lower part are groups of the same height, and the front upper part and the rear upper part are described as examples. The front upper part and the rear upper part comprise 6 burners in total, namely a first front upper burner, a second front upper burner, a third front upper burner, a first rear upper burner, a second rear upper burner and a third rear upper burner.
And averaging the temperature characterization values of the first front upper burner, the second front upper burner and the third front upper burner to obtain T1avg, and averaging the temperature characterization values of the first rear upper burner, the second rear upper burner and the third rear upper burner to obtain T2avg. Comparing T1avg with T2avg, if the two are inconsistent, the PID regulator outputs an adjusting command OPC, the command only represents the adjusting quantity and has no direction, if T1avg is greater than T2avg, the adjusting optimizing command OPC 1=OPC (-1) for the front upper gas adjusting valve expresses the adjusting direction through a negative value, namely small, and simultaneously, the adjusting optimizing command OPC 2=OPC (-1) for the rear upper gas adjusting valve expresses the adjusting direction through a positive value, namely large, if T1avg is smaller than T2avg, the adjusting optimizing command OPC 1=OPC (-1) for the front upper gas adjusting valve and the adjusting optimizing command OPC 2=OPC (-1) for the rear upper gas adjusting valve.
In order to realize faster and more accurate adjustment, the difference between T1avg and T2avg is divided into four sections, wherein the first section is more than 0 and less than or equal to 10 ℃, the second section is more than 10 and less than or equal to 25 ℃, the third section is more than 25 and less than or equal to 40 ℃, and the fourth section is more than 40 ℃, the proportional coefficient, the integral coefficient and the differential coefficient of the PID regulator are set to be [ a, b, c ], when the difference between T1avg and T2avg is in the first section, [ a, b, c ] = [1,0.9,0], when the difference is in the second section, [ a, b, c ] = [1.1,1,0]; when the difference is in the third section, [ a, b, c ] = [ 1.3,1.2,0]; when the difference is in the fourth section, [ a, b, c ] = [1.4,1.2,0]; so as to obtain different adjustment instructions OPC, namely different adjustment amounts.
Therefore, the adjustment modes of the front lower burner and the rear lower burner are consistent, and are not repeated.
The method comprises the steps of (5) leveling air volumes of the same group of burners, taking a group of burners after a first grouping mode, reading information of an oxygen field, comparing a left oxygen representation value OiLavg with a right oxygen representation value OiRavg, if the left oxygen representation value OiLavg is consistent with the right oxygen representation value OiRavg, not adjusting, if OiLavg is larger than OiRavg, adjusting the air volume valve of the burner after intersecting with the left burner group in the group, simultaneously adjusting the air volume valve of the burner after intersecting with the right burner group in the group, if OiLavg is smaller than OiRavg, adjusting the air volume valve of the burner after intersecting with the left burner group in the group, simultaneously adjusting the air volume valve of the burner after intersecting with the right burner group in the group, repeating the step until the adjustment of the burner group in the first grouping mode is completed, and the step is similar to the step 4, and changing the gas valve into the air volume valve, and is not repeated.
The leveling of the burner gas of the same layer is also based on the automatic adjustment of the combustion shown in fig. 3, and the burner gas of the same layer needs to be put into use under the condition of automatic input of the combustion of the boiler. And (3) as a result of leveling combustion optimization of the same-layer combustor, the result is used as an automatic instruction which is overlapped on the same-layer manual operator by a bias and is distributed to a corresponding branch pipe regulating valve, and finally the result participates in a combustion regulating large closed-loop control loop taking main steam pressure as a regulating object.
Step 6, leveling the air quantity of the same-layer burner, taking all groups with the same height in a first grouping mode, reading the information of an oxygen quantity field of each group, averaging the representation value of the left oxygen quantity of each group with the representation value of the right oxygen quantity, if the average value of each group is consistent, not adjusting, if the average value of each group is inconsistent, adjusting the air quantity valve of the burner group with the small average value, simultaneously adjusting the gas valve of the burner group with the large average value, repeating the step until all groups in the first grouping mode are adjusted, and similarly changing the gas valve into the air quantity valve in the step 5, and avoiding repeated description.
And obtaining the optimal temperature field data corresponding to the boiler in different load sections according to the boiler performance data analysis and the boiler combustion adjustment test. When the boiler can burn in the working condition of the optimal temperature field, the air distribution of the boiler is in the optimal matching state. The method comprises the steps of measuring and recording total air quantity of blowers on two sides of a boiler, utilizing an optimal total air quantity model to replace an oxygen quantity correction model in actual operation of the boiler, inputting the optimal total air quantity model into a boiler load, automatically outputting the corresponding optimal total air quantity in a linear broken line function mode, taking the optimal total air quantity as a target value for controlling the output of the blowers, obtaining an air distribution instruction which is more accurate than the oxygen quantity correction, further providing a basic opening instruction for air quantity adjustment of each layer of burner, simultaneously introducing main steam pressure into an air supply PID regulator as a feedforward signal, ensuring that the air quantity is timely adjusted when the working condition of the boiler changes, and maintaining the stability of the air quantity and gas quantity ratio.
The air supply PID feedforward setting is specifically to acquire the main steam pressure in real time, calculate the change rate of the main steam pressure per minute by adopting a numerical analysis algorithm, judge whether the main steam pressure exceeds a preset value a0 or is lower than a preset value a1, if the main steam pressure exceeds the preset value a0, the feedforward gain coefficient K=kmax, if the main steam pressure exceeds the preset value a1, the feedforward gain coefficient K=kmin, otherwise, the feedforward gain coefficient K= Knor, multiply the main steam pressure by the feedforward gain coefficient K to serve as a feedforward signal of the PID and jointly act on the control output of the blower frequency converter.
In this embodiment, a0=0.6, a1=0.2, the feedforward gain coefficient K varies in the range of [0.1,0.2 ]. K=kmax=0.2 when the main steam pressure variation rate per minute is greater than 0.6Mpa, k=kmin=0.1 when the main steam pressure variation rate per minute is less than 0.2Mpa, otherwise k= Knor =0.15.
The present invention is not limited to the above-described embodiments. All technical schemes formed by adopting equivalent substitution fall within the protection scope of the invention.
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110557835.7A CN115371043B (en) | 2021-05-21 | 2021-05-21 | A combustion optimization control method based on boiler CT technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110557835.7A CN115371043B (en) | 2021-05-21 | 2021-05-21 | A combustion optimization control method based on boiler CT technology |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115371043A CN115371043A (en) | 2022-11-22 |
| CN115371043B true CN115371043B (en) | 2025-02-11 |
Family
ID=84059656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110557835.7A Active CN115371043B (en) | 2021-05-21 | 2021-05-21 | A combustion optimization control method based on boiler CT technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115371043B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105135477A (en) * | 2014-05-28 | 2015-12-09 | 通用电气公司 | Systems and methods for variation of injectors for coherence reduction in combustion system |
| CN112325330A (en) * | 2020-11-23 | 2021-02-05 | 华能国际电力股份有限公司 | Balanced combustion system of hedging coal-fired boiler and operation method |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09101022A (en) * | 1995-10-04 | 1997-04-15 | Nkk Corp | Operating method of heat storage type burner furnace |
| KR20040019462A (en) * | 2002-08-28 | 2004-03-06 | 김은기 | Unberned Carbon and Air Damper Control System for Boiler Optimal Combustion |
| JP5095628B2 (en) * | 2006-11-08 | 2012-12-12 | バブコック日立株式会社 | Pulverized coal fired boiler |
| JP6276647B2 (en) * | 2014-05-14 | 2018-02-07 | 株式会社東芝 | Coal fired boiler and its operation control method |
| JP6564191B2 (en) * | 2015-01-16 | 2019-08-21 | ホシザキ株式会社 | Flyer |
| CN105425613B (en) * | 2015-12-07 | 2017-12-22 | 武汉重工铸锻有限责任公司 | Gas furnace kiln computer intelligence Fuzzy control system power-economizing method |
| JP6599307B2 (en) * | 2016-12-28 | 2019-10-30 | 三菱日立パワーシステムズ株式会社 | Combustion device and boiler equipped with the same |
| JP7240870B2 (en) * | 2018-12-20 | 2023-03-16 | 三菱重工業株式会社 | Combustion burner housing device and dummy port closing method |
-
2021
- 2021-05-21 CN CN202110557835.7A patent/CN115371043B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105135477A (en) * | 2014-05-28 | 2015-12-09 | 通用电气公司 | Systems and methods for variation of injectors for coherence reduction in combustion system |
| CN112325330A (en) * | 2020-11-23 | 2021-02-05 | 华能国际电力股份有限公司 | Balanced combustion system of hedging coal-fired boiler and operation method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115371043A (en) | 2022-11-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103244964B (en) | Combustion optimization control system based on acoustically-measured hearth temperature field, and control method thereof | |
| WO2020015694A1 (en) | Combustion air volume control system and method for biomass boiler | |
| CN112524637B (en) | Boiler combustion optimization method and system based on air-powder and CO online monitoring | |
| CN101256418A (en) | A Comprehensive Control Method of Heating Furnace Outlet Temperature | |
| CN112650169B (en) | Generator set main parameter control system based on enthalpy value and fuel online heat value calculation | |
| CN109882833B (en) | A method for controlling steam temperature in variable load process of double reheat thermal power unit | |
| CN110260356A (en) | A kind of energy-saving control method of fluidized-bed combustion boiler | |
| CN108800191A (en) | A kind of Dynamic Optimum method of tangential firing boiler Secondary Air air distribution | |
| CN112228901A (en) | Boiler secondary air distribution online adjusting system and method | |
| TW201827754A (en) | System and method for combustion system control | |
| CN111468709A (en) | Automatic baking system and method of ladle roaster | |
| JPH0454135B2 (en) | ||
| CN115371043B (en) | A combustion optimization control method based on boiler CT technology | |
| CN109751590A (en) | Secondary reheat boiler and steam temperature adjustment method | |
| EP2385321A2 (en) | A method for regulating the combustion process in solid fuel central heating boilers | |
| CN112240566A (en) | Boiler partial combustion online adjusting system and method | |
| CN103870877A (en) | System and method for intelligently controlling boiler combustion based on neural network | |
| CN119245008A (en) | A combustion optimization control method for coal-fired units in thermal power plants | |
| CN216790161U (en) | A bellows structure for controlling the combustion deviation on both sides of a hedging-fired boiler | |
| JP6599307B2 (en) | Combustion device and boiler equipped with the same | |
| CN213686786U (en) | Coal-fired unit platen superheater overtemperature control system based on wall temperature prediction | |
| CN109579044B (en) | Air-fuel ratio dynamic feedforward combustion control method for walking beam furnace | |
| CN112097244A (en) | Wall temperature prediction-based screen type superheater overtemperature control system and method for coal-fired unit | |
| CN117091155B (en) | Boiler optimization suggestion adjustment method based on coal quality combustion | |
| CN115727350A (en) | Two-dimensional temperature field combustion control method and system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |