CN111752203A - Variable-load air classification dynamic control system and method - Google Patents
Variable-load air classification dynamic control system and method Download PDFInfo
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Abstract
The invention provides a variable-load air classification dynamic control method, which belongs to the field of boiler control and is applied to a coal-fired boiler of an air classification combustion system, and the method comprises the following steps: under the variable load running state of the boiler, executing unit load change judgment to obtain a load change judgment result; judging the system operation condition according to the load change judgment result and the current boiler steam temperature deviation value, and generating a load change correction instruction and/or a steam temperature deviation correction instruction according to the operation condition judgment result; and adjusting the air volume control air distribution mode of the boiler under the variable load operation according to the load change correction instruction and/or the steam temperature deviation correction instruction. The air classification and steam temperature synchronous adjustment is realized by combining the change of the operation parameters of the boiler system under the variable load operation state, the load quick change is adapted, and the system adjustment speed and accuracy are improved.
Description
Technical Field
The invention relates to the field of boiler control, in particular to a variable-load air classification dynamic control system and a variable-load air classification dynamic control method.
Background
Implementing ultra-low emission modification and improving the operation flexibility of the unit are two most important tasks of the thermoelectric generation unit in recent years, which are not only policy requirements, but also requirements of enterprises for improving self competitiveness. The low-nitrogen combustion modification mainly characterized by air classification is an important guarantee of ultralow emission, but under the background that a thermal power generating unit generally participates in deep peak regulation, the problem that air classification regulation and steam temperature regulation are not synchronous in the variable-load process of a boiler occurs, and the root of the low-nitrogen combustion modification is that the traditional air classification regulation is always based on a control curve preset by steady-state combustion regulation and does not adapt to the requirements of rapid load change and steam temperature regulation.
Disclosure of Invention
The invention aims to provide a variable-load air classification dynamic control system and a variable-load air classification dynamic control method, so as to at least solve the problem that air classification regulation and steam temperature regulation are not synchronous in the variable-load process of a boiler.
In order to achieve the above object, a first aspect of the present invention provides a variable load air staging dynamic control method applied to a coal-fired boiler employing an air staging combustion system, the method comprising: under the variable load running state of the boiler, executing unit load change judgment to obtain a load change judgment result; judging the system operation condition according to the load change judgment result and the current boiler steam temperature deviation value, and generating a load change correction instruction and/or a steam temperature deviation correction instruction according to the operation condition judgment result; and adjusting the boiler air volume control under the variable load operation according to the load change correction instruction and/or the steam temperature deviation correction instruction.
Preferably, the executing unit load change judgment to obtain a load change judgment result includes: acquiring a main steam pressure actual value; performing difference operation on the actual main steam pressure value and the set main steam pressure value, and determining a load change judgment result according to a pressure difference operation result; the steam temperature deviation value of the boiler is calculated in the following way: acquiring a current actual value of the steam temperature of the boiler; and performing difference operation on the actual value of the steam temperature of the boiler and the rated value of the steam temperature of the boiler, and taking the operation result of the difference value of the steam temperature as the deviation value of the steam temperature of the boiler.
Preferably, the judging the system operation condition according to the load change judgment result and the current boiler steam temperature deviation value, and generating the load change correction instruction and/or the steam temperature deviation correction instruction according to the operation condition judgment result includes: when the pressure difference value operation result is that the absolute value of the pressure deviation value of the main steam pressure actual value and the main steam pressure set value is larger than a preset load deviation value, generating the load change correction instruction; and when the absolute value of the steam temperature deviation value of the boiler is greater than a preset steam temperature deviation value, generating a steam temperature deviation correction instruction.
Preferably, the load change correction instruction comprises a load increase instruction and a load decrease instruction, and the steam temperature deviation correction instruction comprises a steam temperature increase instruction and a steam temperature decrease instruction; the method comprises the following steps of judging the operation condition of the system according to the load change judgment result and the current steam temperature deviation value of the boiler, and generating a load change correction instruction and/or a steam temperature deviation correction instruction according to the operation condition judgment result, wherein the method comprises the following steps: correspondingly generating a load ascending instruction or a load descending instruction according to the positive number or the negative number of the pressure difference value operation result, and determining a load adjustment amount according to the pressure deviation value; and correspondingly generating a steam temperature rising instruction or a steam temperature lowering instruction according to the fact that the steam temperature deviation value of the boiler is a positive number or a negative number, and determining a steam temperature regulating quantity according to the steam temperature deviation value of the boiler.
Preferably, the adjusting the boiler air volume control under the variable load operation according to the load change correction instruction and/or the steam temperature deviation correction instruction includes: and correcting a preset steady-state combustion regulation curve according to the load change correction instruction and/or the steam temperature deviation correction instruction, and generating a final load change correction instruction and/or a final steam temperature deviation correction instruction according to a correction result to regulate the boiler air volume control under the variable-load operation.
Preferably, the adjusting the boiler air volume control under the variable load operation includes: and carrying out air supply dynamic regulation and secondary air grading regulation on the boiler under variable load operation.
The second aspect of the present invention provides a variable load air classification dynamic control system, which is applied to a coal-fired boiler adopting an air classification combustion system, and the system comprises: the unit variable load trend judgment module is used for acquiring main steam pressure and obtaining the system load change condition through the operation and judgment of the main steam pressure; the load dynamic change correction module is used for generating a corresponding load change correction instruction according to the result of judging the system load change condition; the steam temperature deviation dynamic correction module is used for acquiring the steam temperature of the boiler, obtaining the steam temperature change condition of the system through the operation and judgment on the steam temperature of the boiler, and generating a steam temperature change correction instruction according to the steam temperature change condition judgment result of the system; the boiler air supply adjusting module is used for generating a corresponding air supply dynamic adjusting instruction according to the load change correcting instruction and the steam temperature change correcting instruction; and the secondary air grading adjustment module is used for generating a corresponding secondary air grading dynamic adjustment instruction according to the load change correction instruction and the steam temperature change correction instruction.
Preferably, the variable load trend determination module, the load dynamic change correction module and the steam temperature deviation dynamic correction module are all constructed based on existing distributed control system logic blocks.
Preferably, the main steam pressure and the boiler steam temperature are acquired in the following manners: and directly extracting the main steam pressure and the boiler steam temperature from the real-time unit operation parameters acquired by the distributed control system.
In another aspect, the present invention provides a computer readable storage medium having stored thereon instructions which, when executed on a computer, cause the computer to perform the variable load air classification dynamic control method as described above.
According to the technical scheme, after the unit starts to operate in a variable load mode, the system starts to operate in a variable load adjusting mode, the main steam pressure and the steam temperature of the system are obtained in real time, the change rule of the load and the steam temperature of the system is analyzed, the corresponding correction scheme is generated according to the change rule, the stable operation adjustment of the system is achieved, the synchronous adjustment of air classification and the steam temperature in the variable load operation state is achieved, the load rapid change operation working condition is adapted, and the adjusting speed and the accuracy of the system are improved.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
FIG. 1 is a schematic diagram of a variable load air stage dynamic control system according to an embodiment of the present invention.
FIG. 2 is a flow chart of a variable load air staging dynamic control provided by one embodiment of the present invention.
Description of the reference numerals
10-a unit variable load trend judgment module; 20-a load dynamic change correction module; 30-steam temperature deviation dynamic correction module; 40-boiler air supply adjusting module; and 50-secondary air grading adjustment module.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Fig. 1 is a schematic structural diagram of a variable load air classification dynamic control system provided by an embodiment of the invention, and the invention provides a variable load air classification dynamic control system, which comprises: the unit variable load trend judgment module 10 is used for acquiring main steam pressure and obtaining the system load change condition through the operation and judgment of the main steam pressure; the load dynamic change correction module 20 is configured to generate a corresponding load change correction instruction according to the result of judging the system load change condition; the steam temperature deviation dynamic correction module 30 is used for acquiring the steam temperature of the boiler, obtaining the steam temperature change condition of the system through the operation and judgment on the steam temperature of the boiler, and generating a steam temperature change correction instruction according to the steam temperature change condition judgment result of the system; the boiler air supply adjusting module is used for generating a corresponding air supply dynamic adjusting instruction according to the load change correcting instruction and the steam temperature change correcting instruction; and the secondary air grading adjustment module is used for generating a corresponding secondary air grading dynamic adjustment instruction according to the load change correction instruction and the steam temperature change correction instruction.
Preferably, the variable load trend determination module 10, the load dynamic change correction module 20, and the steam temperature deviation dynamic correction module 30 are all constructed based on existing distributed control system logic blocks.
In the embodiment of the invention, the system control modules are used as extension modules to be extended on the distributed control modules of the existing thermal power generating units, the construction cost of the thermal power generating units is high, if the adjusting system is used as a new system construction kit, the use of the existing thermal power generating units cannot be met, the system upgrading is required, and the investment cost is overlarge. Therefore, preferably, all control operation modules of the intelligent regulating system are upgraded and expanded on the existing distributed control module of the unit, normal operation of the system is not affected, and only the connection between the expansion module and the distributed control module needs to be established through electric signals to carry out information and instruction interaction, so that the intelligent regulating system can be upgraded conveniently for traditional unit equipment.
Preferably, the main steam pressure and the boiler steam temperature are both directly extracted from real-time unit operation parameters acquired by the distributed control system.
In the embodiment of the invention, the unit distributed control system acquires system operation parameters in real time through corresponding sensors arranged in a steam turbine and a boiler, and the system operation parameters are parameter information required by the analysis and operation of the air classification dynamic control system for improving the variable load steam temperature regulation characteristic, so that the variable load trend judgment module 10, the load dynamic change correction module 20 and the steam temperature deviation dynamic correction module 30 directly extract the operation parameters acquired by the distributed control system through an expanded signal line as calculation parameters, the sensor setting is reduced, the obtained operation parameters are subjected to corresponding difference value operation and comparison through directly extracting system data to generate an air supply dynamic regulation instruction and a secondary air classification dynamic regulation instruction, and the regulation instruction is transmitted to the boiler air supply regulation module 40 and the secondary air classification regulation module 50 through the expanded signal line, the dynamic air supply regulating instruction and the secondary air grading dynamic regulating instruction are integrated and corrected with a preset regulating curve through the boiler air supply regulating module 40 and the secondary air grading regulating module 50 to generate a final dynamic air supply regulating instruction and a secondary air grading dynamic regulating instruction, the instructions are sent to the distributed control system, the regulating instruction is sent to the execution module through the distributed control system, the total air volume and the opening degree of each baffle of the secondary air grading system are regulated according to the air supply volume and the secondary air volume limited by the regulating instruction through the execution mechanical mechanism of the unit, the signal loop connection between the control module and the execution module of the air grading dynamic control system for improving the variable load steam temperature regulating characteristic is reduced, the instruction transmission is carried out through the existing signal line of the distributed control system, the instruction transmission efficiency is improved, and the system cost is saved.
Preferably, the relationship between the load change correction and the steam temperature change correction and the relationship between the air supply quantity and the secondary air quantity are obtained through a real furnace test according to different combustion boiler units applying the air staged combustion system.
In the embodiment of the invention, different boiler units are different in execution parts, and different in boiler combustion performance, steam temperature regulation characteristics and equipment types, so that dynamic change curves of load and steam temperature are different in the operation process Generating a first relational expression according to the relationship among the first steam temperature deviation value, the total air quantity and the opening degree of each baffle of the secondary air classification system; then adjusting the total air quantity and the opening degree of each baffle of the secondary air classification system in a proper amount, recording the adjustment quantity, then obtaining a third main steam pressure and a third boiler temperature of the adjusted system, respectively calculating the difference between the third main steam pressure and the third boiler temperature and a second main steam pressure and a second boiler temperature to obtain a second load deviation value and a second steam temperature deviation value, and generating a second relational expression by comparing the second load deviation value, the second steam temperature deviation value, the total air quantity and the opening degree of each baffle of the secondary air classification system; and analogizing to generate a plurality of relational expressions among the load deviation amount, the steam temperature deviation amount, the total air volume and the opening degree of each baffle of the secondary air classification system, combining the plurality of relational expressions to generate a single-variable piecewise function for load change correction and steam temperature deviation correction, storing the obtained single-variable piecewise function into the DCS as an operation relational expression of the variable load dynamic control system of the boiler unit, and finally generating a final instruction according to the relational expression. The variable-load air classification dynamic control system can be suitable for coal-fired boiler units of all air classification combustion systems, different instruction output relational expressions are generated aiming at different boilers through real boiler adaptive training, the adjustment quantity is ensured to be in accordance with the operation characteristics of the application boiler, and accurate adjustment is realized.
In addition, the embodiment of the invention also provides a variable-load air classification dynamic control method, which comprises the following steps: under the variable load running state of the boiler, executing unit load change judgment to obtain a load change judgment result; judging the system operation condition according to the load change judgment result and the current boiler steam temperature deviation value, and generating a load change correction instruction and/or a steam temperature deviation correction instruction according to the operation condition judgment result; and adjusting the boiler air volume control under the variable load operation according to the load change correction instruction and/or the steam temperature deviation correction instruction.
Specifically, the executing unit load change judgment to obtain a load change judgment result includes: acquiring a main steam pressure actual value; performing difference operation on the actual main steam pressure value and the set main steam pressure value, and determining a load change judgment result according to a pressure difference operation result; the steam temperature deviation value of the boiler is calculated in the following way: acquiring a current actual value of the steam temperature of the boiler; and performing difference operation on the actual value of the steam temperature of the boiler and the rated value of the steam temperature of the boiler, and taking the operation result of the difference value of the steam temperature as the deviation value of the steam temperature of the boiler.
In the embodiment of the invention, a preset safe operation value is recorded before the system operates, load adjustment is carried out in the system operation process, and if the system is required to keep safe and stable operation, the existing dynamic changes of the main steam pressure and the boiler steam temperature are corrected to be within a preset threshold value, the unit variable load trend judgment module 10 and the steam temperature deviation dynamic correction module 30 respectively obtain the main steam pressure and the boiler steam temperature of a system steam turbine in real time, so that the dynamic change values of the main steam pressure and the boiler steam temperature of the system are detected in real time, the collected main steam pressure and the collected boiler steam temperature are respectively compared with the corresponding preset threshold value through the load dynamic change correction module 20 and the steam temperature deviation dynamic correction module 30 for operation, and the obtained difference value is used as a system operation condition judgment reference value. The load trend of the system is indirectly detected and the steam temperature change trend of the system is directly detected. The real-time operation condition in the system operation process can be detected, and the system load dynamic change and the steam temperature dynamic change can be corrected conveniently.
Specifically, the judging the system operation condition according to the load change judgment result and the current boiler steam temperature deviation value, and generating a load change correction instruction and/or a steam temperature deviation correction instruction according to the operation condition judgment result includes: when the pressure difference value operation result is that the absolute value of the pressure deviation value of the main steam pressure actual value and the main steam pressure set value is larger than a preset load deviation value, generating the load change correction instruction; and when the absolute value of the steam temperature deviation value of the boiler is greater than a preset steam temperature deviation value, generating a steam temperature deviation correction instruction. Correspondingly generating a load ascending instruction or a load descending instruction according to the positive number or the negative number of the pressure difference value operation result, and determining a load adjustment amount according to the pressure deviation value; and correspondingly generating a steam temperature rising instruction or a steam temperature lowering instruction according to the fact that the steam temperature deviation value of the boiler is a positive number or a negative number, and determining a steam temperature regulating quantity according to the steam temperature deviation value of the boiler.
In the embodiment of the invention, in the working process of the system, the main steam pressure and the steam temperature of the boiler are allowed to dynamically change within a preset threshold range, the corresponding system load and the corresponding system steam temperature are allowed to dynamically change within the preset threshold range, and when the variation exceeds the threshold, the system is in an abnormal state, and the variation needs to be corrected within the preset threshold range. The load dynamic change correction module 20 compares the absolute value of the reference value of the system load change trend with a preset load deviation value, in order to prevent parameter oscillation, the preset load deviation value is preferably 0.5Mpa, when the reference value is greater than a preset value, the system load is represented to be abnormally changed, and the larger the difference between the reference value and the preset value, the larger the system load deviation is represented. The arithmetic expression of the system load change trend reference value is that the main steam pressure preset value is subtracted from the main steam pressure actual value, when the obtained system load change trend reference value is a negative number, the main steam pressure actual value is larger than the main steam pressure preset value, and if the system load has positive deviation, reverse correction is needed to be carried out, and the main steam pressure is reduced; when the obtained reference value of the system load change trend is a positive number, the actual value of the main steam pressure is smaller than the preset value of the main steam pressure, and the system load has reverse deviation, forward correction is needed, and the main steam pressure is increased. The difference value operation is performed on the absolute value of the reference value of the system load change trend and the preset load deviation value, so that the deviation value of the system load relative to the threshold value can be obtained, and the system load is guaranteed to be corrected to at least the preset threshold value, so that the obtained difference value is used as the system load correction amount, and the load dynamic change correction module 20 generates a regulation instruction by combining the system load correction direction and the system load correction amount. Similarly, the steam temperature deviation dynamic correction module 30 compares the absolute value of the reference value of the trend of the change of the system steam temperature with a preset steam temperature deviation value, wherein the preset steam temperature deviation value is preferably 3 ℃, when the reference value is greater than the preset value, the system steam temperature is indicated to be changed abnormally, and when the difference between the reference value and the preset value is larger, the system steam temperature deviation is indicated to be larger. The arithmetic expression of the system steam temperature change trend reference value is that the boiler steam temperature preset value is subtracted from the actual boiler steam temperature value, when the obtained system steam temperature change trend reference value is a negative number, the actual boiler steam temperature value is larger than the boiler steam temperature preset value, the system steam temperature generates forward deviation, reverse correction is needed, and the boiler steam temperature is reduced; when the obtained reference value of the system steam temperature change trend is a positive number, the actual value of the boiler steam temperature is smaller than the preset value of the boiler steam temperature, and the system steam temperature generates reverse deviation, forward correction is needed, and the boiler pressure is increased. The difference value operation is performed between the absolute value of the reference value of the steam temperature variation trend of the system and the preset steam temperature deviation value, so that the deviation value of the steam temperature of the system relative to the threshold value can be obtained, the steam temperature of the system is guaranteed to be at least corrected to the preset threshold value, the obtained difference value is used as the correction value of the steam temperature of the system, and the dynamic correction module 30 of the steam temperature deviation generates a regulation instruction by combining the correction direction of the steam temperature of the system and the correction value of the steam temperature of. The deviation and the deviation direction of the system operation parameters can be obtained by performing difference operation on the parameters corresponding to the preset values, the system automatically performs difference operation, and the obtained value is used as a system adjustment reference value, so that the automatic performance of the system is improved, the adjustment direction and the adjustment quantity of the system are determined, and the adjustment accuracy of the system is improved.
Specifically, the adjusting the boiler air volume control under the variable load operation according to the load change correction instruction and/or the steam temperature deviation correction instruction includes: and correcting a preset steady-state combustion regulation curve according to the load change correction instruction and/or the steam temperature deviation correction instruction, and taking the obtained result as a final load change correction instruction and/or a final steam temperature deviation correction instruction.
In the embodiment of the invention, the main steam pressure and the boiler steam temperature are respectively subjected to difference value operation with the corresponding preset values, and then the difference value operation is respectively carried out with the corresponding preset deviation values according to the obtained result to obtain the system regulating quantity and the regulating direction reference value, but the obtained system regulating quantity reference value is regulated to the preset threshold value, the stable running state of the system can be dynamically corrected within the range of the preset threshold value, but the optimal running state is not superposed with the threshold value, so that the system has an optimal running state curve, namely the system is preset with a stable combustion regulating curve, and finally, the regulating instruction obtaining rule is that the system regulated state running curve needs to meet the preset stable combustion regulating curve of the system as far as possible. Therefore, the boiler air supply adjusting module 40 and the secondary air grading adjusting module 50 generate the system adjustment amount and the adjustment direction reference value as a coordinate axis reference point of the system preset steady-state combustion adjustment curve, and the final system adjustment instruction is obtained by superposing the reference value and the system preset steady-state combustion adjustment curve. The boiler air supply adjusting module 40 and the secondary air grading adjusting module 50 can ensure that the system can keep high-efficiency operation under the condition that the state after adjustment meets the stable operation criterion through the adjustment quantity and the final adjustment direction instruction generated by superposing the correction quantity reference value, the correction direction reference value and the steady-state combustion adjustment preset value, so that the system adjustment intelligence is improved, the system adjustment effect is enhanced, and the system operation efficiency is improved.
Specifically, an air supply adjustment instruction is obtained according to the final load change correction instruction and/or the final steam temperature deviation correction instruction, and the air supply adjustment comprises air supply dynamic adjustment and secondary air grading adjustment.
In the embodiment of the invention, the main steam pressure and the boiler steam temperature are reflected quantities in the system operation process, the system load change and the steam temperature change can be detected through the two reflected quantities, the most core factors influencing the two reflected quantities are the boiler air supply quantity and the secondary air quantity, the boiler air supply quantity and the secondary air quantity need to be adjusted when the system load and the system steam temperature are adjusted by adjusting the main steam pressure and the boiler steam temperature, the main steam pressure adjusting value and the boiler steam temperature adjusting value are respectively converted into the air supply dynamic adjusting quantity and the secondary air graded adjusting quantity through the corresponding functional relation by the load dynamic change correcting module 20 and the steam temperature deviation dynamic correcting module 30, and the air supply quantity is reversely determined and enhanced or reduced according to the adjusting instruction display. The system load and the steam temperature are indirectly adjusted by adjusting the air supply quantity and the secondary air quantity, so that the adjusting scheme is easy to operate, simple to execute and high in response speed.
In one possible embodiment, as shown in fig. 2, the unit starts to operate in a steady state, and the boiler air supply adjusting module and the secondary air classification adjusting module respectively output instructions according to corresponding operation curves to set the total air quantity and the opening degree of each baffle of the secondary air classification system. The steam temperature deviation dynamic correction module 30 compares the real-time steam temperature with a rated value, and if the steam temperature deviation from the rated value exceeds a preset value, preferably 5 ℃, a steam temperature deviation correction instruction is output to act on the boiler air supply regulation module and the secondary air grading regulation module, so that the steam temperature level in steady-state operation is improved. When the unit changes, the unit variable load trend determination module 10 compares the deviation of the main steam pressure set value and the actual value with positive and negative, and outputs a load change determination result to the load dynamic change correction module 20, wherein the main steam pressure actual value is greater than the main steam pressure preset value and the difference value is greater than 0.5 MPa. The load dynamic change correction module 20 outputs a load change reduction correction instruction to the boiler air supply regulation module and the secondary air grading regulation module according to the internal logic defined in advance, meanwhile, the steam temperature deviation dynamic correction module 30 compares the real-time steam temperature with a rated value, and if the steam temperature deviates from the rated value by more than 3 ℃, the steam temperature deviation correction instruction is output to the boiler air supply regulation module and the secondary air grading regulation module. And the boiler air supply adjusting module and the secondary air grading adjusting module add the load change correcting instruction, the steam temperature deviation correcting instruction and the basic instruction output according to the operation curve, and optimize the variable-load operation control of the boiler as a final air supply dynamic adjusting instruction and a secondary air grading dynamic adjusting instruction.
While the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solution of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications are within the scope of the embodiments of the present invention. It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention will not be described separately for the various possible combinations.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as disclosed in the embodiments of the present invention as long as it does not depart from the spirit of the embodiments of the present invention.
Claims (10)
1. A variable load air classification dynamic control method is applied to a coal-fired boiler adopting an air classification combustion system, and is characterized by comprising the following steps:
under the variable load running state of the boiler, executing unit load change judgment to obtain a load change judgment result;
judging the system operation condition according to the load change judgment result and the current boiler steam temperature deviation value, and generating a load change correction instruction and/or a steam temperature deviation correction instruction according to the operation condition judgment result;
and adjusting the boiler air volume control under the variable load operation according to the load change correction instruction and/or the steam temperature deviation correction instruction.
2. The variable-load air classification dynamic control method according to claim 1, wherein the executing unit load change judgment to obtain a load change judgment result comprises:
acquiring a main steam pressure actual value;
performing difference operation on the actual main steam pressure value and the set main steam pressure value, and determining a load change judgment result according to a pressure difference operation result;
the steam temperature deviation value of the boiler is calculated in the following way:
acquiring a current actual value of the steam temperature of the boiler;
and performing difference operation on the actual value of the steam temperature of the boiler and the rated value of the steam temperature of the boiler, and taking the operation result of the difference value of the steam temperature as the deviation value of the steam temperature of the boiler.
3. The variable-load air classification dynamic control method according to claim 2, wherein the step of judging the operation condition of the system according to the load change judgment result and the current steam temperature deviation value of the boiler and generating a load change correction instruction and/or a steam temperature deviation correction instruction according to the operation condition judgment result comprises the steps of:
if the pressure difference value operation result is that the absolute value of the pressure deviation value of the main steam pressure actual value and the main steam pressure set value is larger than a preset load deviation value, generating the load change correction instruction;
and if the absolute value of the steam temperature deviation value of the boiler is larger than the preset steam temperature deviation value, generating a steam temperature deviation correction instruction.
4. The variable-load air classification dynamic control method according to claim 2 or 3, wherein the load change correction instruction comprises a load-up instruction and a load-down instruction, and the steam temperature deviation correction instruction comprises a steam-up temperature instruction and a steam-down temperature instruction;
the judging of the system operation condition according to the load change judging result and the current boiler steam temperature deviation value, and the generation of the load change correcting instruction and/or the steam temperature deviation correcting instruction according to the operation condition judging result comprise:
correspondingly generating a load ascending instruction or a load descending instruction according to the positive number or the negative number of the pressure difference value operation result, and determining a load adjustment amount according to the pressure deviation value;
and correspondingly generating a steam temperature rising instruction or a steam temperature lowering instruction according to the fact that the steam temperature deviation value of the boiler is a positive number or a negative number, and determining a steam temperature regulating quantity according to the steam temperature deviation value of the boiler.
5. The variable-load air classification dynamic control method according to claim 1, wherein the adjusting of the boiler air volume control under the variable-load operation according to the load change correction instruction and/or the steam temperature deviation correction instruction comprises:
and correcting a preset steady-state combustion regulation curve according to the load change correction instruction and/or the steam temperature deviation correction instruction, and generating a final load change correction instruction and/or a final steam temperature deviation correction instruction according to a correction result to regulate the boiler air volume control under the variable-load operation.
6. The variable-load air classification dynamic control method according to claim 1, wherein the adjusting of the boiler air volume control under the variable-load operation comprises:
and carrying out air supply dynamic regulation and secondary air grading regulation on the boiler under variable load operation.
7. A variable load air classification dynamic control system is applied to a coal-fired boiler adopting an air classification combustion system, and is characterized by comprising:
the unit variable load trend judgment module is used for acquiring main steam pressure and obtaining the system load change condition through the operation and judgment of the main steam pressure;
the load dynamic change correction module is used for generating a corresponding load change correction instruction according to the judgment system load change condition;
the steam temperature deviation dynamic correction module is used for acquiring the steam temperature of the boiler, obtaining the steam temperature change condition of the system through the operation and judgment on the steam temperature of the boiler, and generating a steam temperature change correction instruction according to the steam temperature change condition of the system;
the boiler air supply adjusting module is used for generating a corresponding air supply dynamic adjusting instruction according to the load change correcting instruction and the steam temperature change correcting instruction;
and the secondary air grading adjustment module is used for generating a corresponding secondary air grading dynamic adjustment instruction according to the load change correction instruction and the steam temperature change correction instruction.
8. The variable load air classification dynamic control system according to claim 7, wherein the variable load trend determination module, the load dynamic change correction module and the steam temperature deviation dynamic correction module are all constructed based on existing distributed control system logic blocks.
9. The variable load air staging dynamic control system of claim 8 wherein the main steam pressure and the boiler steam temperature are collected in the manner of: and directly extracting the main steam pressure and the boiler steam temperature from the real-time unit operation parameters acquired by the distributed control system.
10. A computer readable storage medium having instructions stored thereon which, when executed on a computer, cause the computer to perform the variable load air classification dynamic control method of any one of claims 1 to 6.
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