CN110006024B - Method and device for determining control relation between temperature of outlet partition of boiler furnace and air door - Google Patents
Method and device for determining control relation between temperature of outlet partition of boiler furnace and air door Download PDFInfo
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- CN110006024B CN110006024B CN201910052712.0A CN201910052712A CN110006024B CN 110006024 B CN110006024 B CN 110006024B CN 201910052712 A CN201910052712 A CN 201910052712A CN 110006024 B CN110006024 B CN 110006024B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
- F23N3/06—Regulating air supply or draught by conjoint operation of two or more valves or dampers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2223/00—Signal processing; Details thereof
- F23N2223/10—Correlation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2223/00—Signal processing; Details thereof
- F23N2223/40—Simulation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/08—Measuring temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2235/00—Valves, nozzles or pumps
- F23N2235/02—Air or combustion gas valves or dampers
- F23N2235/06—Air or combustion gas valves or dampers at the air intake
Abstract
The invention provides a method and a device for determining the control relationship between the temperature of a boiler furnace outlet zone and an air door, wherein the method comprises the following steps: respectively testing the performance of a single secondary air door on the front wall and the rear wall of the target boiler aiming at the specified load section to obtain a first temperature change curve of the furnace outlet subarea of the target boiler under different baffle opening degrees of different secondary air doors; respectively testing the performance of a single burnout air door on the front wall and the rear wall of the target boiler to obtain a second temperature change curve of the furnace outlet subarea under different baffle opening degrees of different burnout air doors; and performing data fitting on the first temperature change curve and the second temperature change curve to obtain a first transfer function for representing the corresponding control relation between the temperature of the hearth outlet subarea and a single air door, wherein the air door comprises a secondary air door or a burnout air door.
Description
Technical Field
The invention relates to the technical field of automatic control, in particular to a method and a device for determining a corresponding control relation between a temperature of a boiler furnace outlet zone and air doors (a secondary air door and a burnout air door).
Background
The combustion condition of a boiler in a thermal power plant is closely related to the aspects of safe operation of the boiler, coal-fired resource saving, NOx emission reduction and the like, and the traditional contact or non-contact boiler hearth temperature measurement technology cannot be popularized and applied all the time due to the problems of limited measurement temperature range, poor reliability, higher error and the like.
In recent years, a hearth temperature field measuring means based on a sound wave or laser temperature measuring technology is greatly developed, the blank of the boiler hearth temperature measuring aspect is made up by the advantages of high sensitivity and precision, wide temperature measuring range, unlimited measuring space, easiness in maintenance and the like, the average temperature of the outer ring and the inner ring of the hearth outlet can be measured, the hearth outlet can be partitioned, the average temperature of each partition is given, and a realization basis is provided for a combustion optimization technology.
However, because the corresponding control relationship between the furnace outlet zone temperature and each air door (secondary air door or burnout air door) is not determined, it is difficult to realize the uniform control of the furnace outlet temperature in the industry, and the practical value is greatly reduced.
Disclosure of Invention
In view of the above, in order to solve the above problems, the present invention provides a method and an apparatus for determining a control relationship between a temperature of a furnace outlet zone and an air door of a boiler. The technical scheme is as follows:
a method for determining a control relationship between a temperature of an outlet zone of a furnace of a boiler and a damper, the method comprising:
respectively testing the performance of a single secondary air door on a front wall and a rear wall of a target boiler aiming at a specified load section to obtain a first temperature change curve of a hearth outlet subarea of the target boiler under different baffle opening degrees of different secondary air doors;
respectively testing the performance of a single burnout air door on the front wall and the rear wall of the target boiler to obtain a second temperature change curve of the furnace outlet subarea under different baffle opening degrees of different burnout air doors;
and performing data fitting on the first temperature change curve and the second temperature change curve to obtain a first transfer function for representing the corresponding control relation between the temperature of the hearth outlet subarea and a single air door, wherein the air door comprises the secondary air door or the burnout air door.
Preferably, the method further comprises:
and monitoring the running state of the target boiler, and executing the performance test of a single secondary air door on the front wall and the rear wall of the target boiler aiming at the specified load section under the condition that the target boiler is in a stable running state to obtain a first temperature change curve of the furnace outlet subarea of the target boiler under different baffle opening degrees of different secondary air doors.
Preferably, the method further comprises:
and carrying out simplified processing on the first transfer function.
Preferably, the method further comprises:
performing same-layer double-side secondary air door performance test on the front wall and the rear wall of the target boiler to obtain a third temperature change curve of the furnace outlet subarea under different baffle opening degrees of different groups of same-layer double-side secondary air doors;
performing performance test on the front wall and the rear wall of the target boiler on the same-layer double-side burnout air doors to obtain fourth temperature change curves of the furnace outlet subareas under different baffle opening degrees of different groups of same-layer double-side burnout air doors;
and performing data fitting on the third temperature change curve and the fourth temperature change curve to obtain a second transfer function for representing the corresponding control relationship between the temperature of the furnace outlet subarea and the air doors on two sides on the same layer.
Preferably, the method further comprises:
and simplifying the second transfer function.
An apparatus for determining a control relationship between a temperature of a furnace exit zone and a damper, the apparatus comprising:
the test module is used for respectively carrying out single secondary air door performance test on the front wall and the rear wall of the target boiler aiming at the specified load section to obtain a first temperature change curve of the furnace outlet subarea of the target boiler under different baffle opening degrees of different secondary air doors; respectively testing the performance of a single burnout air door on the front wall and the rear wall of the target boiler to obtain a second temperature change curve of the furnace outlet subarea under different baffle opening degrees of different burnout air doors;
and the fitting module is used for performing data fitting on the first temperature change curve and the second temperature change curve to obtain a first transfer function for representing the corresponding control relation between the temperature of the hearth outlet subarea and a single air door, and the air door comprises the secondary air door or the burnout air door.
Preferably, the apparatus further comprises:
and the monitoring module is used for monitoring the running state of the target boiler and triggering the testing module under the condition that the target boiler is in a stable running state.
Preferably, the fitting module is further configured to:
and carrying out simplified processing on the first transfer function.
Preferably, the test module is further configured to:
performing same-layer double-side secondary air door performance test on the front wall and the rear wall of the target boiler to obtain a third temperature change curve of the furnace outlet subarea under different baffle opening degrees of different groups of same-layer double-side secondary air doors; performing performance test on the front wall and the rear wall of the target boiler on the same-layer double-side burnout air doors to obtain fourth temperature change curves of the furnace outlet subareas under different baffle opening degrees of different groups of same-layer double-side burnout air doors;
the fitting module is further configured to:
and performing data fitting on the third temperature change curve and the fourth temperature change curve to obtain a second transfer function for representing the corresponding control relationship between the temperature of the furnace outlet subarea and the air doors on two sides on the same layer.
Preferably, the fitting module is further configured to:
and simplifying the second transfer function.
The invention provides a method and a device for determining a control relation between a temperature of a furnace outlet subarea of a boiler and air doors, which are used for determining a corresponding control relation between the temperature of the furnace outlet subarea and each air door in a simple, safe and effective performance test mode, and can transfer a combustion state of a furnace chamber to an optimal area and a comfortable area by adjusting secondary air and over-fire air on the premise of ensuring the operation safety of the boiler, thereby ensuring the stable ignition, complete combustion and uniform combustion of the boiler, reducing the problems of partial combustion, slag formation, over-temperature of a superheater and the like, improving the thermal efficiency of the boiler, and reducing the emission of pollutants.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flowchart of a method for determining a control relationship between a temperature of a furnace exit zone and a damper of a boiler according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of arrangement of acoustic thermometry and furnace exit temperature zone definition;
FIG. 3 is a flowchart of another method for determining a control relationship between a temperature of a furnace exit zone and a damper of a boiler according to an embodiment of the present invention;
FIG. 4 is a flowchart of another method for determining the control relationship between the temperature of the furnace exit zone and the damper of the boiler according to the embodiment of the present invention;
FIG. 5 is a flowchart of another method for determining the control relationship between the temperature of the furnace exit zone and the damper of the boiler according to the embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a device for determining the control relationship between the temperature of the furnace outlet zone and the damper of the boiler according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a method for determining a control relation between a temperature of a furnace chamber outlet subarea and an air door, and a flow chart of the method is shown in figure 1 and comprises the following steps:
and S10, respectively carrying out single secondary air door performance test on the front wall and the rear wall of the target boiler aiming at the specified load section to obtain a first temperature change curve of the furnace outlet subarea of the target boiler under different baffle opening degrees of different secondary air doors.
In performing step S10, the specified load segment may be any one of high, medium and low load segments, and all of the following tests are performed under one of the specified load segments. Of course, if the following tests are carried out on the high load section, the middle load section and the low load section, the control relation between the temperature of the furnace outlet subarea of the boiler and the air door under the full working condition can be obtained.
Firstly, the temperature of the outlet subarea of the hearth is simply introduced:
for convenience of understanding, the target boiler is described as a once-through boiler using a swirl opposed combustion method, but the target boiler is not limited to the once-through boiler:
for a boiler adopting a rotational flow opposed firing mode, a furnace temperature field online monitoring system based on an acoustic temperature measurement principle can divide the cross section of the boiler into p zones, and the zone temperatures of the p zones are measured by an acoustic temperature measurement system in a DCS (Distributed control system). Meanwhile, the average temperature of the outer ring of the hearth is calculated from the temperature of each subarea on the outer side of the hearth, and the average temperature of the inner ring of the hearth is calculated from the temperature of each subarea on the inner side of the hearth. The temperatures T01-T0p of the furnace outlet partitions, the initial furnace outer ring average temperature Tp01 and the initial furnace inner ring average temperature Tp02 at the specified times are recorded.
For example, the test power plant is a #1 unit of a certain power generation company, the boiler is a direct-flow boiler adopting a rotational flow opposed firing mode, the rated power is 600MW, 6 medium-speed coal mills are provided with positive-pressure direct-blowing powder preparation systems, a hearth temperature field online monitoring system based on a sound wave temperature measurement principle is arranged in a hearth, and the test is respectively carried out in three high, medium and low load sections of 580MW, 450MW and 330 MW. As shown in the arrangement mode of sound wave temperature measurement and the definition of the outlet temperature subareas of the furnace hearth in the figure 2, the system divides the section of the boiler into 16 subareas, the 16 subarea temperatures T01-T016 are measured by the sound wave temperature measurement system, meanwhile, the average temperature Tp01 of the outer ring of the furnace hearth is calculated from the 12 subarea temperatures of 1-12 subareas, and the average temperature Tp02 of the inner ring of the furnace hearth is calculated from the 4 subarea temperatures of 13-16 subareas.
Further, performance tests are executed on all layers of secondary air doors of the front wall and all layers of secondary air doors of the rear wall, and therefore a first temperature change curve of the furnace outlet partition under different baffle opening degrees of all layers of secondary air doors is obtained. The following describes the performance test procedure for the secondary damper a:
step (1): for the secondary air door A, the opening degree of the baffle is adjusted (increased or decreased) a 1% on the basis of the original opening degree, the secondary air door A waits for a certain time, after the temperature of the hearth is stable, a first temperature Tn1-Tnp change curve of a hearth outlet partition is recorded through DCS system historical data, and at the moment, the average temperature Tpn1 change curve of the outer ring of the hearth and the average temperature Tpn2 change curve of the inner ring of the hearth are recorded.
Step (2): and (4) restoring the opening of the baffle of the secondary air door A to the original opening, and waiting for stabilization.
And (3): and (3) adjusting (increasing or decreasing) b 1%, c 1%, d 1% and e 1% … … in sequence on the basis of the original opening of the baffle, performing performance test again according to the steps, and recording related data.
It should be noted that the adjustment range of the opening of the secondary air door baffle is ensured in the range that the furnace flame is not over-burnt for a long time and the content of NOx at the outlet of the furnace is not greatly increased. And (3) making a plurality of groups of data as much as possible in a reasonable range to ensure the accuracy of the test result, and recovering the opening degree of the baffle of the secondary air door to the original opening degree after the performance test of any secondary air door is finished.
For example, a burner of a direct-current boiler adopting a swirl opposed combustion mode is generally arranged by opposed arrangement of a front wall and a rear wall, a secondary air door of the front wall is divided into three layers, namely a layer D, a layer C and a layer E from high to low, a secondary air door of the rear wall is divided into three layers, namely a layer A, a layer F and a layer B from high to low, a mill B in 6 mills is reserved, the rest 5 mills run normally, the initial opening degree of the secondary air door of the layer B of the rear wall is about 20%, and the opening degrees of the rest secondary air doors are about 50% -55%.
Explaining a secondary air door on the E layer of the front wall, increasing the opening degree of a baffle by 5 percent on the basis of the original opening degree, waiting for 10min, recording a first temperature Tn1-Tn16 change curve of a furnace outlet partition through DCS system historical data after the temperature of a furnace is stable, and then recording a furnace outer ring average temperature Tpn1 change curve and a furnace inner ring average temperature Tpn2 change curve; restoring the opening of the baffle to the original opening, and waiting for stabilization; and adjusting the opening of the baffle plate by 10 percent on the original basis, waiting for 10min, and … … restoring the opening of the baffle plate to the original opening after all performance tests of the secondary air door on the E layer of the front wall are finished.
And respectively carrying out performance test on secondary air doors of a front wall D layer, a front wall C layer, a rear wall A layer, a rear wall F layer and a rear wall B layer according to the flow, recording related data and recovering the opening degree of the baffle to the original opening degree after the test is finished.
And S20, respectively carrying out performance tests on the front wall and the rear wall of the target boiler to obtain second temperature change curves of the furnace outlet subareas under different baffle opening degrees of different burnout air doors.
In the process of executing step S20, performance tests are executed for each burnout damper of the front wall and each burnout damper of the rear wall, so as to obtain a second temperature variation curve of the furnace outlet partition under different baffle opening degrees of each burnout damper. The following describes the procedure for performing the performance test on the burn-out damper B:
step (1): for the burnout air door B, the opening degree of the baffle is adjusted (increased or decreased) h 1% on the basis of the original opening degree, the furnace is waited for a certain time, after the temperature of the furnace is stable, a second temperature Tq1-Tqp change curve of the furnace outlet subarea is recorded through DCS system historical data, and at the moment, the average temperature of the outer ring of the furnace is Tpq1 change curve, and the average temperature of the inner ring of the furnace is Tpq2 change curve.
Step (2): and (4) recovering the opening of the baffle of the burnout air door B to the original opening, and waiting for stabilization.
And (3): and (3) adjusting (increasing or decreasing) g 1%, k 1%, m 1% and n 1% … … in sequence on the basis of the original opening of the baffle, performing performance test again according to the steps, and recording related data.
It should be noted that the adjustment range of the opening of the burnout damper should ensure that the furnace flame is not over-burnt for a long time and the content of NOx at the outlet of the furnace is not greatly increased. And several groups of data are made as much as possible in a reasonable range to ensure the accuracy of a test result, and the opening degree of the baffle of the burnout air door is restored to the original opening degree after the performance test of any burnout air door is completed.
For example, in a burner of a once-through boiler of the swirl opposed firing system, there is one layer (denoted as "G layer") of burnout dampers of the front wall and one layer (denoted as "H layer") of burnout dampers of the rear wall. Explaining a G-layer burnout air door on a front wall, increasing the opening degree of a baffle by 5 percent on the basis of the original opening degree, waiting for 10min, recording a second temperature Tq1-Tq16 change curve of a furnace outlet partition through DCS (distributed control system) historical data after the temperature of a furnace is stable, wherein the average temperature of the outer ring of the furnace at the moment is Tpq1 change curve, and the average temperature of the inner ring of the furnace is Tpq2 change curve; restoring the opening of the baffle to the original opening, and waiting for stabilization; and adjusting the opening of the baffle plate to increase by 10% on the original basis, waiting for 10min, and … … restoring the opening of the baffle plate to the original opening after all performance tests of the G-layer burnout air door of the front wall are finished.
And performing performance test on the H-layer burnout air door of the rear wall according to the flow, recording related data and recovering the opening degree of the baffle to the original opening degree after the test is finished.
And S30, performing data fitting on the first temperature change curve and the second temperature change curve to obtain a first transfer function for representing the corresponding control relation between the temperature of the hearth outlet subarea and a single air door, wherein the air door comprises a secondary air door or a burnout air door.
In the process of executing step S30, the matlab software or other software may be used to perform system identification on the data to obtain a first system transfer function array as shown in the following formula (1):
wherein, the meaning of each symbol in the formula (1) is shown in the following table 1:
TABLE 1
In the formula, G isabDepending on the recognition accuracy of the system, the transfer function may have different structures and parameters, and may have smaller deviations under different test conditions such as different loads.
In other embodiments, in order to improve the correlation of the first transfer function, on the basis of the method for determining the control relationship between the temperature of the furnace outlet zone of the boiler and the damper as shown in fig. 1, the method further comprises the following steps, and the flow chart of the method is shown in fig. 3:
s40, the first transfer function is simplified.
In the process of executing step S40, by considering various performance indexes and actual conditions of the system, the parts of the system that are slow in response speed, large in delay, small in adjustment range and difficult to control are removed, only the factors with strong correlation with the temperatures of the respective zones are retained, so that a simplified first system transfer function array can be obtained, and then parameters of the transfer function array in the formula are corrected through data under different loads, different opening degrees and the like, so that the corresponding control relationship between the temperature of the outlet zone of the furnace and the single-side air door can be obtained.
For example, for a burner of a once-through boiler adopting a swirl opposed firing method, the correspondence between the furnace outlet partition temperature Y1-Y16 and each damper X1-X8 obtained at a specific load stage is shown in the following formula (2):
wherein each transfer function is as follows:
the results of the system identification show that: the delay time of the secondary air door is shortened from the lower layer to the upper layer along with the approach of a temperature measuring point away from a hearth outlet subarea, the gain coefficient K in the transfer function is larger and larger, the response amplitude of the system is increased, and meanwhile, the time constant T in the inertia link is reduced, and the rapidity of the system response is better and better. Because the pure lag link can reduce the stability of the control system and the dynamic characteristic becomes worse, especially for the large lag process with the ratio of the pure lag time to the time constant of the controlled object more than 0.3, the control quality of the system can be obviously reduced, the satisfactory control performance can not be obtained by adopting the conventional control strategy, the great difficulty is brought to the design of the subsequent furnace zone temperature control system controller, in addition, the opening degree of the secondary air doors of the lower two layers can not excessively undershoot the flame of the furnace, the carbon granules which are not burnt completely can be prevented from falling into the ash cooling bucket, the environmental significance of the oxygen deficient combustion of the furnace can be kept, meanwhile, the transfer function gain is small, the time constant is large, the control is slow, the adjusting range is small and the control is difficult, therefore, the lag time in the embodiment is more than 10, the gain K is small, and the part with the larger inertia link time constant T is omitted, only the part which has large influence on the zone temperature and quick influence and has small delay time and easy control is reserved, and a simplified first system transfer function array shown in the following formula (3) is obtained:
the meaning of the parameters in the formula and the transfer function in the formula are the same as those in the formula (2), and are not repeated herein, so that the practicability and usability of the obtained formula are greatly enhanced, and the design difficulty and the engineering realization difficulty of the controller of the zone temperature are greatly reduced. According to the data relation established by the above formula, the corresponding control relation between the temperature of the furnace outlet subarea and the single air door can be obtained quantitatively. And then, the recorded average temperature change curves of the inner ring and the outer ring of the hearth are used for finding out an optimal combustion area and a comfortable combustion area of the boiler through subsequent tests and tests, and the temperature of the inner ring subarea at the outlet of the hearth can be conveniently controlled to be close to the set value of the average temperature of the inner ring and the temperature of the outer ring subarea is close to the set value of the average temperature of the outer ring by combining a related control algorithm, so that the combustion stability, the economical efficiency and the environmental protection performance of the boiler are improved.
In other embodiments, to ensure smooth operation of the test, the method further includes the following steps based on the method for determining the control relationship between the temperature of the furnace outlet zone of the boiler and the damper shown in fig. 1, and the flow chart of the method is shown in fig. 4:
s50, the operation state of the target boiler is monitored, and if the target boiler is in a stable operation state, the step S10 is executed.
In the process of executing step S50, the main operating parameters of the boiler, such as steam water, air and smoke system, main steam pressure and intermediate temperature, can be monitored, and the parameters are within the specified fluctuation range, which indicates that the boiler is operating stably.
Certainly, before the test, it is required to determine that the sound wave temperature measurement system can be normally put into use, the sounding measurement point and the receiving measurement point are normal, the temperature of each subarea can be quickly and accurately displayed on a DCS system picture, a secondary air door and an over-fire air adjusting door are in normal operation states, other main and auxiliary equipment and systems of a unit have no major defects, historical trends of the temperature of each subarea of the secondary air and the hearth outlet of the system are normally stored, and the like.
In addition, in order to ensure the accuracy of the test, when the load section is tested, parameters such as air pressure, air volume and the like are not adjusted except for specified operation, and the coal type for combustion is kept stable during the test process as much as possible, so that the temperature fluctuation of the outlet subarea of the boiler caused by the change of the coal type is eliminated.
In other embodiments, to improve the control accuracy, on the basis of the method for determining the control relationship between the temperature of the furnace outlet zone of the boiler and the damper as shown in fig. 1, the method further includes the following steps, and the flow chart of the method is shown in fig. 5:
and S60, performing same-layer double-side secondary air door performance test on the front wall and the rear wall of the target boiler to obtain a third temperature change curve of the furnace outlet partition under different baffle opening degrees of different groups of same-layer double-side secondary air doors.
In the process of step S60, a performance test is performed on each group of the same-layer double-sided secondary air doors of the front wall and the rear wall, for example, for a direct-flow boiler in a swirl hedging combustion mode, the three groups of the same-layer double-sided secondary air doors are respectively a front wall D layer and a rear wall a layer, a front wall C layer and a rear wall F layer, and a front wall E layer and a rear wall B layer. The following description will be made of the performance test process by taking a set of same-layer double-side secondary air doors as an example:
step (1): for each of the two-sided secondary air doors of the same layer, the opening degree of the baffle is simultaneously adjusted (increased or decreased) a 2% on the basis of the original opening degree, the furnace is waited for a certain period of time, after the temperature of the furnace is stabilized, a third temperature Tmn1-Tmnp change curve of a furnace outlet partition is recorded through the historical trend of a DCS, the average temperature Tpmn1 change curve of the outer ring of the furnace at the moment, and the average temperature Tpmn2 change curve of the inner ring of the furnace at the moment.
Step (2): and restoring the opening of the baffle to the original opening and waiting for stabilization.
And (3): and (3) adjusting (increasing or decreasing) b 2%, c 2%, d 2% and e 2% … … at the same time on the basis of the original opening of the baffle, performing performance test again according to the steps, and recording related data.
It should be noted that the adjustment range of the opening of the secondary air door baffle is ensured in the range that the furnace flame is not over-burnt for a long time and the content of NOx at the outlet of the furnace is not greatly increased. And after the performance test of any group of the secondary air doors on the same layer and two sides is finished, the opening degrees of the baffles of the group of the secondary air doors on the same layer and two sides are all restored to the original opening degrees.
And S70, performing performance test on the same-layer double-side burnout air doors on the front wall and the rear wall of the target boiler to obtain a fourth temperature change curve of the furnace outlet subareas under different baffle opening degrees of different groups of same-layer double-side burnout air doors.
In the process of step S70, for each group of the same-layer double-sided burnout dampers of the front wall and the rear wall, such as for a once-through boiler in a swirl opposed firing manner, the group of same-layer double-sided burnout dampers are the front-wall G-layer burnout damper and the rear-wall H-layer burnout damper. The following description will be given of the performance test process using the same-layer double-side burnout dampers as an example:
step (1): for each of the group of the same-layer double-side burnout air doors, the opening degree of the baffle is simultaneously adjusted (increased or decreased) by h2 on the basis of the original opening degree, the furnace is waited for a certain time, after the temperature of the furnace is stabilized, a fourth temperature Tqh1-Tqhp change curve of a furnace outlet subarea is recorded through the historical trend of a DCS, the average temperature Tpqh1 change curve of the outer ring of the furnace at the time, and the average temperature Tpqh2 change curve of the inner ring of the furnace at the time.
Step (2): and restoring the opening of the baffle to the original opening and waiting for stabilization.
And (3): and (3) adjusting (increasing or decreasing) g 2%, k 2%, m 2% and n 2% … … at the same time on the basis of the original opening of the baffle, performing performance test again according to the steps, and recording related data.
It should be noted that the adjustment range of the opening of the burnout damper should ensure that the furnace flame is not over-burnt for a long time and the content of NOx at the outlet of the furnace is not greatly increased. And several groups of data are made as much as possible in a reasonable range to ensure the accuracy of the test result, and the baffle opening of the burnout air doors on two sides of the same layer of any group is restored to the original opening after the performance test of the burnout air doors on two sides of the same layer is completed.
And S80, performing data fitting on the third temperature change curve and the fourth temperature change curve to obtain a second transfer function for representing the corresponding control relationship between the temperature of the furnace outlet subarea and the air doors on the two sides of the same layer.
In the process of executing step S80, matlab software or other software may be used to perform system identification on the data to obtain the second system transfer function array, and the specific process may refer to the process of obtaining the first system transfer function array in step S30, which is not described herein again.
Of course, in some other embodiments, to improve the relevance of the second transfer function, the second transfer function may also be simplified, and the specific simplification process may refer to the simplification of the first transfer function in step S40, which is not described herein again.
According to the method for determining the control relation between the temperature of the furnace outlet subarea of the boiler and the air doors, which is provided by the embodiment of the invention, the corresponding control relation between the temperature of the furnace outlet subarea and each air door is determined by a simple, safe and effective performance test method, and on the premise of ensuring the operation safety of the boiler, the combustion state of the furnace can be transferred to the optimal area and the comfortable area by adjusting secondary air and over-fire air, so that the ignition stability, complete combustion and uniform combustion of the boiler are ensured, the problems of partial combustion, slag formation, over-temperature of a superheater and the like are reduced, the thermal efficiency of the boiler is improved, and the emission of pollutants is reduced.
Based on the method for determining the control relationship between the temperature of the boiler furnace outlet zone and the air door provided by the embodiment, the embodiment of the invention provides a device for determining the control relationship between the temperature of the boiler furnace outlet zone and the air door, and the structural schematic diagram of the device is shown in fig. 6, and the device comprises:
the test module 10 is used for respectively carrying out single secondary air door performance test on the front wall and the rear wall of the target boiler aiming at the specified load section to obtain a first temperature change curve of the furnace outlet subarea of the target boiler under different baffle opening degrees of different secondary air doors; and respectively carrying out performance test on the front wall and the rear wall of the target boiler to obtain a second temperature change curve of the furnace outlet subarea under different baffle opening degrees of different burnout air doors.
And the fitting module 20 is configured to perform data fitting on the first temperature change curve and the second temperature change curve to obtain a first transfer function for representing a corresponding control relationship between the furnace outlet partition temperature and a single air door, where the air door includes a secondary air door or a burnout air door.
In other embodiments, in order to ensure smooth operation of the test, on the basis of the control relationship determination device for the temperature of the furnace outlet zone and the air door of the boiler shown in fig. 6, the following modules are further included:
and the monitoring module is used for monitoring the running state of the target boiler and triggering the testing module 10 under the condition that the target boiler is in a stable running state.
In some other embodiments, to improve the correlation of the first transfer function, the fitting module 30 is further configured to:
the first transfer function is simplified.
In some other embodiments, to improve the accuracy of the control, the test module 20 is further configured to:
performing same-layer double-side secondary air door performance test on the front wall and the rear wall of the target boiler to obtain a third temperature change curve of the furnace outlet subareas under different baffle opening degrees of different groups of same-layer double-side secondary air doors; performing performance test on the front wall and the rear wall of the target boiler on the same-layer double-side burnout air doors to obtain fourth temperature change curves of furnace outlet partitions under different baffle opening degrees of different groups of same-layer double-side burnout air doors;
and performing data fitting on the third temperature change curve and the fourth temperature change curve to obtain a second transfer function for representing the corresponding control relation between the temperature of the furnace outlet subarea and the air doors on the two sides on the same layer.
In some other embodiments, to improve the correlation of the second transfer function, the fitting module 30 is further configured to:
the second transfer function is simplified.
The device for determining the control relation between the temperature of the furnace outlet subarea of the boiler and the air doors determines the corresponding control relation between the temperature of the furnace outlet subarea and each air door by a simple, safe and effective performance test method, and can transfer the combustion state of the furnace to the optimal area and the comfortable area by adjusting secondary air and over-fire air on the premise of ensuring the operation safety of the boiler, thereby ensuring the stable ignition, complete combustion and uniform combustion of the boiler, reducing the problems of partial combustion, slag formation, over-temperature of a superheater and the like, improving the thermal efficiency of the boiler, and reducing the emission of pollutants.
The method and the device for determining the control relationship between the temperature of the outlet subarea of the boiler furnace and the air door are introduced in detail, the principle and the implementation mode of the invention are explained by applying specific examples, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include or include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A method for determining the control relation between the temperature of a furnace outlet subarea of a boiler and a damper is characterized by comprising the following steps:
respectively testing the performance of a single secondary air door on a front wall and a rear wall of a target boiler aiming at a specified load section to obtain a first temperature change curve of a hearth outlet subarea of the target boiler under different baffle opening degrees of different secondary air doors;
respectively testing the performance of a single burnout air door on the front wall and the rear wall of the target boiler to obtain a second temperature change curve of the furnace outlet subarea under different baffle opening degrees of different burnout air doors;
performing data fitting on the first temperature change curve and the second temperature change curve to obtain a first transfer function for representing the corresponding control relation between the temperature of the hearth outlet subarea and a single air door, wherein the air door comprises the secondary air door or the burnout air door;
monitoring the running state of the target boiler, and executing the performance test of a single secondary air door on the front wall and the rear wall of the target boiler aiming at the specified load section under the condition that the target boiler is in a stable running state to obtain a first temperature change curve of a furnace outlet partition of the target boiler under different baffle opening degrees of different secondary air doors;
performing same-layer double-side secondary air door performance test on the front wall and the rear wall of the target boiler to obtain a third temperature change curve of the furnace outlet subarea under different baffle opening degrees of different groups of same-layer double-side secondary air doors;
performing performance test on the front wall and the rear wall of the target boiler on the same-layer double-side burnout air doors to obtain fourth temperature change curves of the furnace outlet subareas under different baffle opening degrees of different groups of same-layer double-side burnout air doors;
and performing data fitting on the third temperature change curve and the fourth temperature change curve to obtain a second transfer function for representing the corresponding control relationship between the temperature of the furnace outlet subarea and the air doors on two sides on the same layer.
2. The method of claim 1, further comprising:
and carrying out simplified processing on the first transfer function.
3. The method of claim 1, further comprising:
and simplifying the second transfer function.
4. An apparatus for determining a control relationship between a temperature of a furnace exit zone and a damper, the apparatus comprising:
the test module is used for respectively carrying out single secondary air door performance test on the front wall and the rear wall of the target boiler aiming at the specified load section to obtain a first temperature change curve of the furnace outlet subarea of the target boiler under different baffle opening degrees of different secondary air doors; respectively testing the performance of a single burnout air door on the front wall and the rear wall of the target boiler to obtain a second temperature change curve of the furnace outlet subarea under different baffle opening degrees of different burnout air doors;
the fitting module is used for performing data fitting on the first temperature change curve and the second temperature change curve to obtain a first transfer function for representing the corresponding control relation between the temperature of the hearth outlet subarea and a single air door, wherein the air door comprises the secondary air door or the burnout air door;
the monitoring module is used for monitoring the running state of the target boiler and triggering the testing module under the condition that the target boiler is in a stable running state;
the test module is further configured to:
performing same-layer double-side secondary air door performance test on the front wall and the rear wall of the target boiler to obtain a third temperature change curve of the furnace outlet subarea under different baffle opening degrees of different groups of same-layer double-side secondary air doors; performing performance test on the front wall and the rear wall of the target boiler on the same-layer double-side burnout air doors to obtain fourth temperature change curves of the furnace outlet subareas under different baffle opening degrees of different groups of same-layer double-side burnout air doors;
the fitting module is further configured to:
and performing data fitting on the third temperature change curve and the fourth temperature change curve to obtain a second transfer function for representing the corresponding control relationship between the temperature of the furnace outlet subarea and the air doors on two sides on the same layer.
5. The apparatus of claim 4, wherein the fitting module is further configured to:
and carrying out simplified processing on the first transfer function.
6. The apparatus of claim 4, wherein the fitting module is further configured to:
and simplifying the second transfer function.
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| CN111536532B (en) * | 2020-05-12 | 2022-12-13 | 湖南现代环境科技股份有限公司 | Flow field and control system of household garbage incinerator |
| CN114135900B (en) * | 2021-11-11 | 2023-10-13 | 吉林省电力科学研究院有限公司 | Air door control method and device based on hearth over-fire air temperature monitoring |
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