CN115193571B - Wind pressure control method, device, storage medium and equipment - Google Patents
Wind pressure control method, device, storage medium and equipment Download PDFInfo
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- CN115193571B CN115193571B CN202210806325.3A CN202210806325A CN115193571B CN 115193571 B CN115193571 B CN 115193571B CN 202210806325 A CN202210806325 A CN 202210806325A CN 115193571 B CN115193571 B CN 115193571B
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 239000003245 coal Substances 0.000 claims abstract description 171
- 238000012937 correction Methods 0.000 claims abstract description 70
- 238000013507 mapping Methods 0.000 claims description 31
- 230000008859 change Effects 0.000 claims description 23
- 238000004590 computer program Methods 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 5
- 238000005265 energy consumption Methods 0.000 abstract description 19
- 230000009467 reduction Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 10
- 238000004891 communication Methods 0.000 description 8
- 238000007664 blowing Methods 0.000 description 4
- 230000005236 sound signal Effects 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010298 pulverizing process Methods 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- KLDZYURQCUYZBL-UHFFFAOYSA-N 2-[3-[(2-hydroxyphenyl)methylideneamino]propyliminomethyl]phenol Chemical compound OC1=CC=CC=C1C=NCCCN=CC1=CC=CC=C1O KLDZYURQCUYZBL-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 201000001098 delayed sleep phase syndrome Diseases 0.000 description 1
- 208000033921 delayed sleep phase type circadian rhythm sleep disease Diseases 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C25/00—Control arrangements specially adapted for crushing or disintegrating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L13/00—Construction of valves or dampers for controlling air supply or draught
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
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- Feeding And Controlling Fuel (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
The present disclosure relates to a wind pressure control method, apparatus, storage medium, and device to reduce throttling loss and boiler energy consumption. The wind pressure control method comprises the following steps: determining an opening instruction of a hot air adjusting door of the coal mill; determining whether the opening instruction is smaller than a first preset opening instruction; the first preset opening instruction is a maximum opening instruction set before the primary air pressure is reduced on the basis that the output of the coal mill can meet the set load requirement after the primary air pressure is reduced; determining a primary air pressure correction value corresponding to the opening instruction under the condition that the opening instruction is smaller than a first preset opening instruction; and controlling the air pressure of the boiler according to the primary air pressure correction value.
Description
Technical Field
The disclosure relates to the technical field of boiler combustion control, in particular to a wind pressure control method, a device, a storage medium and equipment.
Background
In a direct-fired pulverizing system of a boiler, the control of the primary air quantity of a coal mill is particularly important. If the primary air quantity of the coal mill is smaller, the coal mill can be blocked, or a fire nozzle is burnt, or the abnormal phenomena such as spontaneous combustion of coal powder deposition and the like occur in a part of areas. If the primary air quantity of the coal mill is larger, the proportion of cold air doping is larger, the smoke discharging temperature is increased, the efficiency of the boiler is reduced, and meanwhile, the abrasion of the primary air pipe and the increase of the power consumption of the primary air blower are caused. Therefore, under the condition of ensuring the safe operation of the coal mill, the primary air quantity of the coal mill is often required to be capable of rapidly responding to load change.
The related art generally adjusts the primary air quantity through a coal mill hot air adjusting door. Because the adjustment linearity of the hot air adjusting door is poor, when the hot air adjusting door of the coal mill is adjusted to a larger opening section, the load change cannot be responded quickly, and the set load requirement cannot be met. When the hot air adjusting door of the coal mill is adjusted to a smaller opening section (for example, 30% -40%), a higher primary air pressure is often required than when the same air quantity is controlled in a larger opening section. Under the condition of overhigh primary air pressure, the throttling loss of the hot air adjusting door is large, which is unfavorable for energy conservation and consumption reduction of the boiler.
Disclosure of Invention
An object of the present disclosure is to provide a wind pressure control method, apparatus, storage medium, and storage device to solve the problems in the related art.
To achieve the above object, according to a first aspect of embodiments of the present disclosure, there is provided a wind pressure control method including:
determining an opening instruction of a hot air adjusting door of the coal mill;
determining whether the opening instruction is smaller than a first preset opening instruction; the first preset opening instruction is a maximum opening instruction set before the primary air pressure is reduced on the basis that the output of the coal mill can meet the set load requirement after the primary air pressure is reduced;
Determining a primary air pressure correction value corresponding to the opening instruction under the condition that the opening instruction is smaller than the first preset opening instruction;
and controlling the air pressure of the boiler according to the primary air pressure correction value.
Optionally, determining the first preset opening instruction includes:
controlling the opening of the hot air adjusting door of the coal mill to change for a plurality of times according to a plurality of preset opening instructions in a preset opening instruction set, reducing primary air pressure after changing the opening of the hot air adjusting door of the coal mill each time, and determining whether the output of the coal mill can meet the set load requirement after reducing primary air pressure on the basis of the opening;
determining a maximum opening instruction which can meet the set load requirement after reducing the wind pressure once by the coal mill output from the preset opening instruction set;
and determining the maximum opening instruction as the first preset opening instruction.
Optionally, the determining whether the opening command is smaller than a first preset opening command includes:
and determining whether a target opening instruction with the largest opening instruction among the opening instructions of the hot air adjusting doors of the coal mill is smaller than a first preset opening instruction.
Optionally, the determining the primary wind pressure correction value corresponding to the opening instruction includes:
Determining a primary wind pressure correction value according to the opening command and the first mapping relation;
the first mapping relation is used for representing the mapping relation between the opening instruction and the primary wind pressure correction value.
Optionally, the method further comprises:
under the condition that the opening instruction is determined to be larger than the first preset opening instruction, determining whether a candidate coal mill with the opening instruction larger than a second preset opening instruction exists or not; the second preset opening instruction is the upper limit of the opening instruction of the hot air adjusting door of the coal mill;
under the condition that the candidate coal mill exists, determining a difference value between an actual primary air quantity value and a primary air quantity set value of the candidate coal mill, wherein the primary air quantity set value is the primary air quantity corresponding to the set load requirement;
determining a target difference value with the largest difference value median among the plurality of candidate coal mills;
determining a primary air pressure correction value corresponding to the target difference value under the condition that the target difference value is larger than a preset air volume difference value; the preset air volume difference value is the minimum air volume difference value that the output of the candidate coal mill cannot meet the set load requirement.
Optionally, determining the preset air volume difference value includes:
Determining a plurality of preset primary air quantity set values according to a plurality of preset difference values in a preset air quantity difference value set and the primary air quantity actual value of the candidate coal mill;
changing the primary air quantity set value of the candidate coal mill for a plurality of times according to a plurality of preset primary air quantity set values, so that the difference value between the primary air quantity set value and the primary air quantity actual value is changed for a plurality of times, and determining whether the output of the candidate coal mill can meet the set load requirement after changing the primary air quantity set value each time;
determining a minimum air volume difference value which cannot meet the set load requirement after the primary air volume set value is changed by the candidate coal mill output from the preset air volume difference value set;
and determining the minimum air volume difference value as the preset air volume difference value.
Optionally, the determining the primary wind pressure correction value corresponding to the target difference value includes:
determining a primary wind pressure correction value according to the target difference value and a second mapping relation;
the second mapping relation is used for representing the mapping relation between the target difference value and the primary wind pressure correction value.
According to a second aspect of embodiments of the present disclosure, there is provided a wind pressure control apparatus, the apparatus including:
The first determining module is used for determining an opening instruction of a hot air adjusting door of the coal mill;
the second determining module is used for determining whether the opening instruction is smaller than a first preset opening instruction or not; the first preset opening instruction is a maximum opening instruction set before the primary air pressure is reduced on the basis that the output of the coal mill can meet the set load requirement after the primary air pressure is reduced;
the third determining module is used for determining a primary wind pressure correction value corresponding to the opening instruction under the condition that the opening instruction is smaller than the first preset opening instruction;
and the control module is used for controlling the air pressure of the boiler according to the primary air pressure correction value.
According to a third aspect of embodiments of the present disclosure, there is provided a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method of any of the first aspects described above.
According to a fourth aspect of embodiments of the present disclosure, there is provided an electronic device, comprising:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to implement the steps of the method of any of the above first aspects.
The opening instruction of the hot air adjusting door of the coal mill is determined, and whether the opening instruction is smaller than a first preset opening instruction or not is determined, so that a primary air pressure correction value corresponding to the opening instruction can be determined under the condition that the opening instruction is smaller than the first preset opening instruction. The first preset opening instruction is a maximum opening instruction set before the primary air pressure is reduced on the basis that the output of the coal mill can meet the set load requirement after the primary air pressure is reduced, so that if the opening instruction is smaller than the first preset opening instruction, the value of the opening instruction can be increased on the basis that the output of the coal mill can meet the set load requirement. Wherein the value of the opening command is generally increased with a decrease in primary wind pressure, which in turn may result in a decrease in throttling losses. On the basis, the air pressure of the boiler can be controlled to be reduced according to the primary air pressure correction value corresponding to the opening command, so that the opening of the hot air adjusting door of the coal mill is dynamically increased along with the reduction of the air pressure of the boiler, and on the basis of meeting the set load requirement, the opening of the hot air adjusting door can be increased as much as possible, thereby reducing throttling loss and energy consumption of the boiler, and improving the efficiency of the boiler.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
fig. 1 is a flowchart illustrating a wind pressure control method according to an exemplary embodiment of the present disclosure.
Fig. 2 is a logic diagram of determining a target opening command according to an exemplary embodiment of the present disclosure.
FIG. 3 is a logic diagram of determining a target difference value according to an exemplary embodiment of the present disclosure.
FIG. 4 is a schematic diagram illustrating logic for determining a primary air pressure correction value in accordance with an exemplary embodiment of the present disclosure.
Fig. 5 is a block diagram of a wind pressure control apparatus according to an exemplary embodiment of the present disclosure.
Fig. 6 is a block diagram of an electronic device, as shown in an exemplary embodiment of the present disclosure.
Detailed Description
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
It should be noted that parameters such as primary air pressure, primary air volume, coal amount, and coal mill adjustment door opening in the boiler are in dynamic balance with load changes. If the boiler cannot respond to the load change rapidly, the dynamic balance cannot be maintained rapidly or cannot be maintained, so that the set load requirement cannot be met, the combustion efficiency of the boiler is affected, and resource waste and the like are caused. The load change can be characterized by the change of a set load instruction (namely, set load requirement) given by the outside, and can also be characterized by the change of an internal medium, the change of coal quantity, the change of an adjusting door opening, the change of primary air pressure or the change of other factors. Because the adjustment linearity of the hot air adjusting door is poor, if the opening degree of the hot air adjusting door of the coal mill is large, the load change cannot be responded quickly, so that the set load requirement cannot be met. When the opening of the hot air adjusting door of the coal mill is smaller, higher primary air pressure is needed compared with the control of the same air quantity under the condition of larger opening. Under the condition of overhigh primary air pressure, the throttling loss of the hot air adjusting door is large, which is unfavorable for energy conservation and consumption reduction of the boiler.
In the related art, taking a 1000 megawatt coal-fired boiler direct-fired pulverizing system (the boiler is configured with 6 direct-fired medium speed coal mills a-F, wherein primary air required by the pulverizing system can be provided by two primary fans) as an example, a primary air pressure set value corresponding to a set load requirement when the boiler burns can be generally determined by adopting the following formula, so that the primary air pressure can be dynamically adjusted according to load changes:
Primary wind pressure set point = f 1 (x 1 )*f 2 (x 2 )+ΔP；
Wherein f 1 (x 1 ) For primary wind pressure correction coefficient, x 1 F is the number of coal mill operations 1 (x 1 ) And x 1 The mapping of (2) may be as shown in table 1 below:
TABLE 1
| x 1 | 0 | 1 | 2 | 3 | 4 | 5 | 6 |
| f 1 (x 1 ) | 1 | 0.6 | 1 | 1 | 1 | 1 | 1 |
Wherein f 2 (x 2 ) For the initial value of primary wind pressure, x 2 For maximum feeder instruction (which may characterize the coal value of the currently operating coal mill), f 2 (x 2 ) And x 2 The mapping of (2) may be as shown in table 2 below:
TABLE 2
| x 2 | 0 | 20 | 35 | 50 | 65 | 80 | 90 | 100 |
| f 2 (x 2 ) | 5.1 | 5.1 | 5.1 | 6.3 | 8.1 | 9.8 | 10.2 | 10.2 |
Wherein Δp is a primary air pressure set point bias, which can be manually adjusted by a human.
Although the above formula can determine the dynamically changing primary air pressure set value according to the load change, Δp in the primary air pressure set value is manually adjusted according to experience by a person, and the influence on the primary air pressure in the changing process of the hot air adjusting door of the coal mill (namely, when the opening degree of the hot air adjusting door of the coal mill is increased, the air pressure is correspondingly reduced, and when the opening degree of the hot air adjusting door is reduced, the air pressure is correspondingly increased, and vice versa) is not considered, so that when the opening degree of the hot air adjusting door of the coal mill is located in a smaller room, the throttling loss and the energy consumption of the boiler are excessively large due to the excessive primary air pressure. When the opening of the hot air adjusting door of the coal mill is positioned in a larger opening, the load change cannot be responded quickly due to poor adjustment linearity of the hot air adjusting door, so that the set load requirement cannot be met.
In view of this, the present disclosure provides a wind pressure control method, apparatus, storage medium and device, which adjust primary wind pressure by a first preset opening command. The first preset opening instruction is a maximum opening instruction set before the primary air pressure is reduced on the basis that the output of the coal mill can meet the set load requirement after the primary air pressure is reduced, so that if the opening instruction of the hot air adjusting door of the coal mill is smaller than the first preset opening instruction, the value of the opening instruction can be increased on the basis that the set load requirement can be met. On the basis, the air pressure of the boiler can be controlled to be reduced according to the primary air pressure correction value corresponding to the opening command, so that the opening of the hot air adjusting door of the coal mill is dynamically increased along with the reduction of the air pressure of the boiler, and on the basis of meeting the set load requirement, the opening of the hot air adjusting door can be increased as much as possible, thereby reducing throttling loss and energy consumption of the boiler, and improving the efficiency of the boiler.
Fig. 1 is a flowchart illustrating a wind pressure control method according to an exemplary embodiment of the present disclosure, which may be applied to a boiler controller (e.g., a controller of a direct-blowing 1000 megawatt coal-fired boiler) as shown in fig. 1, the method including:
S101, determining an opening instruction of a hot air adjusting door of the coal mill.
The opening command of the hot air adjusting door of the coal mill is related to a primary air quantity set value, the primary air quantity set value is related to a coal feeding quantity, and the coal feeding quantity is related to a unit load command. In one possible way, the opening command of the hot air adjusting door of the coal mill can be determined according to the unit load command (namely, set load requirement).
S102, determining whether the opening instruction is smaller than a first preset opening instruction.
The first preset opening instruction is a maximum opening instruction set before the primary air pressure is reduced on the basis that the output of the coal mill can meet the set load requirement after the primary air pressure is reduced.
It should be appreciated that the corresponding coal mill output requirements may be determined based on the set load requirements. In the case where the actual output of the coal mill (i.e., the output of the coal mill after the primary air pressure reduction) meets the output requirement of the coal mill, it may be indicated that the set load requirement can be met. Accordingly, in the event that the actual output of the coal mill fails to meet the output requirement of the coal mill, it may be indicated that the set load requirement cannot be met.
S103, when the determined opening instruction is smaller than the first preset opening instruction, determining a primary air pressure correction value corresponding to the opening instruction.
S104, controlling the air pressure of the boiler according to the primary air pressure correction value.
It is to be understood that, since the first preset opening command is the maximum opening command set before the primary air pressure is reduced on the basis that the output of the coal mill can meet the set load requirement after the primary air pressure is reduced, if the opening command is smaller than the first preset opening command, the value of the opening command can be increased on the basis that the set load requirement can be met. On the basis, the boiler wind pressure reduction can be controlled according to the primary wind pressure correction value corresponding to the opening command (for example, the primary wind pressure correction value can be used as the primary wind pressure set value offset delta P in the formula, so that a more accurate primary wind pressure set value is obtained, and the primary fan is controlled to control the boiler wind pressure according to the more accurate primary wind pressure set value), so that the opening of the hot air adjusting door of the coal mill is dynamically increased along with the reduction of the boiler wind pressure, and on the basis of meeting the set load requirement, the opening of the hot air adjusting door can be increased as much as possible, thereby reducing throttling loss and boiler energy consumption and improving the boiler efficiency.
Optionally, the step of determining the first preset opening command may include:
Controlling the opening of the hot air adjusting door of the coal mill to change for a plurality of times according to a plurality of preset opening instructions in a preset opening instruction set, and reducing primary air pressure after changing the opening of the hot air adjusting door of the coal mill each time so as to determine whether the output of the coal mill can meet the set load requirement after reducing primary air pressure on the basis of the opening;
determining a maximum opening instruction which can meet the set load requirement after reducing the wind pressure once by the coal mill output from a preset opening instruction set;
and determining the maximum opening instruction as a first preset opening instruction.
The preset opening instruction set may be determined according to practical situations, for example, the plurality of preset opening instructions in the preset opening instruction set may be opening instructions with a value between 80 and 95, which is not specifically limited in the present disclosure.
Because the primary air pressure is overlarge when the opening of the hot air adjusting door of the coal mill is positioned in a smaller opening, throttling loss and boiler energy consumption are overlarge, the primary air pressure can be reduced when the opening of the hot air adjusting door of the coal mill is positioned in a smaller opening. However, the opening of the hot air adjusting door increases along with the reduction of the primary air pressure, and when the opening of the hot air adjusting door is too large, the load change cannot be responded quickly, so that the set load requirement cannot be met. Therefore, the embodiment of the disclosure controls the opening of the hot air adjusting door of the coal mill to change for a plurality of times according to a plurality of preset opening instructions in the preset opening instruction set, and reduces the wind pressure once after changing the opening of the hot air adjusting door of the coal mill each time so as to determine whether the output of the coal mill can meet the set load requirement after reducing the wind pressure once on the basis of the opening. On the basis, a maximum opening instruction, namely a first preset opening instruction, which can meet the set load requirement after the coal mill output after the wind pressure is reduced once, can be determined. Therefore, in actual application, whether the primary air pressure is reduced or not can be determined according to the hot air adjusting door opening command of the coal mill and the first preset opening command, and the primary air pressure is reduced when the hot air adjusting door opening command of the coal mill is smaller than the first preset opening command, so that the hot air adjusting door opening is dynamically increased along with the primary air pressure, and the throttling loss and the energy consumption of the boiler are reduced.
It is to be understood that, for the hot air adjusting door with the opening smaller than the first preset opening command, the primary air pressure can be adjusted by adopting the scheme, so that the throttling loss and the energy consumption of the boiler are reduced on the basis of meeting the set load requirement. For the hot air adjusting door with the opening larger than the first preset opening instruction, if the scheme is still adopted to adjust the primary air pressure, the set load requirement may not be met. It should be understood that, for the hot air adjusting door having an opening greater than or equal to the first preset opening command, the primary air pressure is not maintained constant, but may be changed accordingly as the load changes according to the scheme of maintaining dynamic balance in the boiler in the related art.
It should be noted that the first preset opening degree command determined by the different types of boiler plant may be different. For example, for a blow-through 1000 megawatt coal-fired boiler, the inventor may have experimentally obtained a first preset opening command of 80.
Optionally, the step S102 may include:
and determining whether a target opening instruction with the largest opening instruction value among opening instructions of the hot air adjusting doors of the coal mills is smaller than a first preset opening instruction.
Since the object to which the primary air pressure is adjusted is usually all coal mills, for example, when there are a plurality of coal mills whose opening degree command is smaller than the first preset opening degree command (for example, a mill and an F mill), if the opening degree command of the a mill is greater than that of the F mill, the primary air pressure correction value obtained from the opening degree command of the a mill is smaller than that obtained from the opening degree command of the F mill (the smaller the opening degree command is, the greater the adjustment amount of the primary air pressure is). On the basis, if all primary fans are adjusted according to the primary air pressure correction value corresponding to the F mill, excessive adjustment of the primary air pressure of the A mill may be caused, so that the opening of the hot air adjusting door of the A mill is too large to quickly respond to load change. Moreover, if there is a coal mill (for example, B mill) greater than the first preset opening command, then whether the primary air pressure of all the coal mills is adjusted according to the primary air pressure correction value corresponding to the a mill or the F mill, excessive adjustment of the primary air pressure of the B mill is caused, so that the B mill cannot quickly respond to the load change, and thus the set load requirement cannot be met. Therefore, in order for all coal mills to meet the set load requirement, it may be determined whether a target opening instruction having a largest opening instruction among the opening instructions of the plurality of coal mill hot air adjustment doors is smaller than a first preset opening instruction.
Correspondingly, when the target opening instruction is determined to be smaller than the first preset opening instruction, a corresponding primary air pressure correction value can be determined according to the target opening instruction, and the air pressure of the boiler can be controlled according to the primary air pressure correction value. Therefore, the situation that the set load requirement cannot be met due to excessive adjustment of primary air pressure can be avoided, and meanwhile, the primary air pressure of all coal mills can be adjusted according to the primary air pressure correction value corresponding to the target opening instruction, so that the opening degree of the hot air adjusting door is increased as much as possible on the basis of meeting the set load requirement, and the effects of reducing throttling loss and energy consumption of a boiler and improving the efficiency of the boiler are achieved.
Referring to fig. 2, fig. 2 is a logic diagram illustrating a determination of a target opening command according to an exemplary embodiment of the present disclosure. From the logic control shown in FIG. 2, all operations can be determinedThe target opening instruction with the largest value in the opening instructions of the hot air adjusting door of the coal mill, namely K shown in fig. 2 max . On the basis of this, it can be based on K max And a first preset opening instruction, determining whether to reduce primary wind pressure, and determining that the primary wind pressure is lower than primary wind pressure in K max And when the opening degree is smaller than the first preset opening degree instruction, the primary air pressure is reduced, so that the opening degree of the hot air adjusting door is dynamically increased. Because the first preset opening instruction is the maximum opening instruction which is set before the primary air pressure is reduced on the basis that the output of the coal mill can meet the set load requirement after the primary air pressure is reduced, the primary air pressure is reduced under the condition that the target opening instruction is smaller than the first preset opening instruction, the adjustment amount (reduction amount) of the primary air pressure is maximized on the basis that the set load requirement is met, and therefore throttling loss and boiler energy consumption are reduced as much as possible.
Optionally, in the step S103, determining the primary wind pressure correction value corresponding to the opening command may include:
and determining a primary wind pressure correction value according to the opening command and the first mapping relation.
The first mapping relation is used for representing the mapping relation between the opening instruction and the primary wind pressure correction value. The first mapping relationship may be set according to actual situations, which is not specifically limited in the present disclosure. For example, for a direct-blowing 1000 megawatt coal-fired boiler, the inventors experimentally obtained a mapping relationship between the opening command and the primary air pressure correction value may be as shown in table 3 below:
TABLE 3 Table 3
| Opening instruction | 20 | 40 | 60 | 80 |
| Primary wind pressure correction value (kPa) | -0.6 | -0.5 | -0.2 | 0 |
Optionally, the technical solution provided by the embodiment of the present disclosure may further include:
under the condition that the opening instruction is determined to be larger than a first preset opening instruction, determining whether a candidate coal mill with the opening instruction larger than a second preset opening instruction exists or not;
under the condition that the candidate coal mill exists, determining a difference value between an actual primary air quantity value and a primary air quantity set value of the candidate coal mill, wherein the primary air quantity set value is the primary air quantity corresponding to the set load requirement;
determining a target difference value with the largest difference value median of the plurality of candidate coal mills;
And under the condition that the target difference value is larger than the preset air volume difference value, determining a primary air pressure correction value corresponding to the target difference value.
The preset air volume difference value can be a minimum air volume difference value that the output of the candidate coal mill cannot meet the set load requirement (or a maximum air volume difference value that the output of the candidate coal mill can meet the set load requirement). The second preset opening instruction is the upper limit of the opening instruction of the hot air adjusting door of the coal mill. It should be understood that in the case where the opening command of the hot air adjustment door of the coal mill is greater than the opening command upper limit, the influence of the opening of the hot air adjustment door on the primary air volume is reduced. That is, in this case, if the opening command of the hot air adjusting door is increased, the primary air volume is hardly increased. If the load demand is set to continue to increase when the opening command of the hot air adjustment door of the coal mill is greater than the opening command upper limit, the primary air volume cannot be increased by increasing the opening command, but the primary air volume can be increased by increasing the primary air pressure.
In the process of increasing the primary air pressure, the opening degree of the hot air adjusting door is reduced along with the increase of the primary air pressure, so that the throttling loss is increased. Therefore, in order to reduce the throttling loss as much as possible, a minimum air volume difference value (i.e. a preset air volume difference value) that the output of the candidate coal mill (i.e. the coal mill with the opening command being greater than the second preset opening command) cannot meet the set load requirement can be predetermined, so that when the candidate coal mill with the opening command being greater than the second preset opening command is determined, the difference value between the actual primary air volume value and the set primary air volume value of the candidate coal mill is determined, and when the difference value is greater than the minimum air volume difference value, the primary air pressure is adjusted. Compared with the method for adjusting the primary air pressure of the candidate coal mill under the condition that the primary air volume set value is larger than the primary air volume actual value, the method disclosed by the invention can be used for adjusting the primary air pressure under the condition that the difference value between the primary air volume set value and the primary air volume actual value is larger than the minimum air volume difference value. Thus, the adjustment amount of the primary air pressure can be minimized, thereby reducing the throttling loss and the energy consumption of the boiler.
Further, since the object to which the primary air pressure is adjusted once is generally all the coal mills, if the primary air pressure is adjusted according to the smaller value of the differences between the actual primary air quantity values and the set primary air quantity values of the plurality of candidate coal mills, the primary air pressure adjustment amount of the candidate coal mill with the larger difference may not be sufficient (the smaller the difference is, the smaller the primary air pressure adjustment amount is), so that the primary air quantity of the candidate coal mill with the larger difference is increased, and the primary air quantity corresponding to the set load requirement cannot be satisfied. Therefore, in order to enable all coal mills to meet the set load requirement, a target difference value with the largest difference value among the plurality of candidate coal mills can be determined, and a primary air pressure correction value corresponding to the target difference value is determined under the condition that the target difference value is larger than a preset air volume difference value. Therefore, the problem that the set load requirement cannot be met due to insufficient adjustment amount of the primary air pressure can be avoided, and meanwhile, the primary air pressure of all coal mills can be adjusted according to the primary air pressure correction value corresponding to the target difference value, so that the opening degree of the hot air adjusting door is larger as much as possible on the basis of meeting the set load requirement, and the effects of reducing throttling loss and energy consumption of a boiler and improving the efficiency of the boiler are achieved.
Referring to fig. 3, fig. 3 is a logic diagram illustrating a determination of a target difference value according to an exemplary embodiment of the present disclosure. According to the logic control shown in fig. 3, it can be determined that the opening degree command is greater than the second preset opening degree command (K shown in fig. 3 d ) And determining a target difference value with the largest difference value of the primary air volume actual value (air volume feedback shown in figure 3) and the primary air volume set value (air volume command shown in figure 3) of the plurality of candidate coal mills, namely delta Q shown in figure 3 max . Based on this, it can be determined by ΔQ max And a preset air volume difference value, determining whether to increase the primary air pressure and determining the air pressure at delta Q max And increasing the primary air pressure under the condition of being larger than the preset air quantity difference value. Because the preset air volume difference value is the minimum air volume difference value that the output of the candidate coal mill cannot meet the set load requirement, the primary air pressure is increased under the condition that the target difference value is larger than the preset air volume difference value, so that the adjustment quantity (increase quantity) of the primary air pressure is minimum on the basis of meeting the set load requirement, and the throttling loss and the energy consumption of the boiler are reduced as much as possible.
Optionally, the step of determining the preset air volume difference value may include:
determining a plurality of preset primary air quantity set values according to a plurality of preset difference values in a preset air quantity difference value set and the primary air quantity actual value of the candidate coal mill;
Changing the primary air quantity set value of the candidate coal mill for a plurality of times according to a plurality of preset primary air quantity set values, so that the difference value between the primary air quantity set value and the primary air quantity actual value is changed for a plurality of times, and determining whether the output of the candidate coal mill can meet the set load requirement after changing the primary air quantity set value each time;
determining a minimum air volume difference value which cannot meet the set load requirement of the candidate coal mill in the output after changing the primary air volume set value from a preset air volume difference value set;
and determining the minimum air volume difference value as a preset air volume difference value.
The preset air volume difference set may represent a set of differences between an actual primary air volume value and a set primary air volume value, and a plurality of preset differences in the preset air volume difference set may be determined according to actual situations, for example, the preset air volume difference set may include preset differences of 0, 2, 4, 6, 8 (t/h) and the like, which is not specifically limited in the present disclosure. It will be appreciated that if the actual primary air volume value is 50t/h, the preset primary air volume set value may be determined to be a value such as 50, 52, 54, 56, or 58 (t/h) according to a plurality of preset difference values in the preset air volume difference value set and the actual primary air volume value.
It should be noted that, since the opening command of the candidate coal mill is greater than the second preset opening command (in this case, the influence of the opening of the hot air adjustment door of the candidate coal mill on the primary air volume is reduced, that is, if the opening command of the hot air adjustment door is increased, the primary air volume is hardly increased, so that the primary air volume setting value is changed according to the plurality of preset primary air volume setting values, so that the primary air volume cannot be adjusted by adjusting the opening of the hot air adjustment door in the process of changing the difference between the primary air volume setting value and the actual primary air volume multiple times, but the primary air volume can be increased by increasing the primary air pressure, so that the increased primary air volume satisfies the primary air volume setting value. On the basis, after the air quantity set value is changed once each time, whether the output force of the candidate coal mill can meet the set load requirement can be determined, and the minimum air quantity difference value (namely the preset air quantity difference value) that the output force of the candidate coal mill cannot meet the set load requirement is further determined from the preset air quantity difference value set. Therefore, in actual application, whether the primary air pressure is increased or not can be determined according to the preset air volume difference value and the target difference value with the largest difference value of the primary air volume actual values and the primary air volume set values of the candidate coal mills, and the primary air pressure is increased under the condition that the target difference value is larger than the preset air volume difference value. Because the preset air volume difference value is the minimum air volume difference value that the output of the candidate coal mill cannot meet the set load requirement, the primary air pressure is increased under the condition that the target difference value is larger than the preset air volume difference value, the adjustment amount of the primary air pressure can be minimized, and therefore throttling loss and boiler energy consumption are reduced as much as possible.
Optionally, determining the primary wind pressure correction value corresponding to the target difference value may include:
and determining a primary wind pressure correction value according to the target difference value and the second mapping relation.
The second mapping relation is used for representing the mapping relation between the target difference value and the primary wind pressure correction value. The second mapping relationship may be set according to actual situations, which is not specifically limited in the present disclosure. For example, for a direct-blowing 1000 megawatt coal-fired boiler, the inventors experimentally obtained a map of the target difference value and the primary air pressure correction value may be as shown in table 4 below:
TABLE 4 Table 4
| Target difference (t/h) | 0 | 2 | 8 | 10 |
| Primary wind pressure correction value (kPa) | 0 | 0 | 0.4 | 0.4 |
Referring to fig. 4, fig. 4 is a logic diagram illustrating a determination of a primary air pressure correction value according to an exemplary embodiment of the present disclosure. According to the logic control shown in FIG. 4The target opening instruction with the largest value among the opening instructions of all the hot air adjusting doors of the coal mill can be determined (K is shown in figure 4) max ) And a first preset opening command (K shown in fig. 4), and determining a target difference value (delta Q shown in fig. 4) with the largest difference value of the primary air volume actual value and the primary air volume set value of the plurality of candidate coal mills max ) And the preset air quantity difference (delta Q shown in figure 4) can be based on K max In the case of less than K, according to the first mapping relation (f as shown in FIG. 4 3 (x 3 ) Determining K) max And the corresponding primary wind pressure correction value. Alternatively, at K max Greater than K and DeltaQ max In the case of more than Δq, according to the second mapping relation (f as shown in fig. 4 4 (x 4 ) Determining Δq max And the corresponding primary wind pressure correction value. Thus can be at K max In the case of less than K, according to K max The corresponding primary air pressure correction value reduces the primary air pressure so as to maximize the adjustment amount (reduction amount) of the primary air pressure on the basis of satisfying the set load requirement. At K max Greater than K and DeltaQ max In the case of greater than ΔQ, according to ΔQ max The corresponding primary air pressure correction value increases the primary air pressure so as to minimize the adjustment amount (increase amount) of the primary air pressure on the basis of meeting the set load requirement, thereby achieving the effect of reducing throttling loss and boiler energy consumption as much as possible.
It should also be noted that in determining K max Thereafter, K may be determined by a lead/lag algorithm (LEADLAG) module of the related art max Making adjustments (e.g. to K max Performing tuning fault filtering) to reduce errors and thereby increase the determined K max Accuracy of (3). Similarly, in determining ΔQ max Then, ΔQ can also be calculated by a lead/lag algorithm (LEADLAG) module in the related art max Make adjustments (e.g. to DeltaQ max Performing tuning fault filtering) to reduce errors and thereby increase the determined Δq max Accuracy of (3).
Optionally, f in the formula according to above 1 (x 1 )*f 2 (x 2 ) Base for determining primary wind pressure initial set valueOn the basis, the step S104 may include:
determining a primary air pressure target set value according to the primary air pressure corrected value and the primary air pressure initial set value;
and controlling the air pressure of the boiler according to the primary air pressure target set value.
For example, the primary wind pressure correction value may be offset by Δp as the primary wind pressure set value in the above formula, so that the primary wind pressure correction value and the primary wind pressure initial set value are added/subtracted to obtain the primary wind pressure target set value. On the basis, the primary air blower can be controlled to control the air pressure of the boiler according to the primary air pressure target set value.
The experimental result of the inventor shows that in the wind pressure control of the direct blowing type 1000 megawatt coal-fired boiler, the primary wind pressure can be reduced by 2-3 kPa, the primary fan electricity consumption can be reduced by about 0.08%, and the power supply coal consumption can be reduced by 0.24 g/kW.h.
By adopting the method, the opening instruction of the hot air adjusting door of the coal mill is determined, and whether the opening instruction is smaller than the first preset opening instruction or not is determined, so that the primary air pressure correction value corresponding to the opening instruction can be determined under the condition that the opening instruction is smaller than the first preset opening instruction. The first preset opening instruction is a maximum opening instruction set before the primary air pressure is reduced on the basis that the output of the coal mill can meet the set load requirement after the primary air pressure is reduced, so that if the opening instruction is smaller than the first preset opening instruction, the value of the opening instruction can be increased on the basis that the output of the coal mill can meet the set load requirement. Wherein the value of the opening command is generally increased with a decrease in primary wind pressure, which in turn may result in a decrease in throttling losses. On the basis, the air pressure of the boiler can be controlled to be reduced according to the primary air pressure correction value corresponding to the opening command, so that the opening of the hot air adjusting door of the coal mill is dynamically increased along with the reduction of the air pressure of the boiler, and on the basis of meeting the set load requirement, the opening of the hot air adjusting door can be increased as much as possible, thereby reducing throttling loss and energy consumption of the boiler, and improving the efficiency of the boiler.
Based on the same inventive concept, the present disclosure also provides a wind pressure control apparatus, referring to fig. 5, and fig. 5 is a block diagram of a wind pressure control apparatus according to an exemplary embodiment of the present disclosure. As shown in fig. 5, the wind pressure control device 100 includes:
a first determining module 101, configured to determine an opening instruction of a hot air adjustment door of the coal mill;
a second determining module 102, configured to determine whether the opening command is smaller than a first preset opening command; the first preset opening instruction is a maximum opening instruction set before the primary air pressure is reduced on the basis that the output of the coal mill can meet the set load requirement after the primary air pressure is reduced;
a third determining module 103, configured to determine a primary wind pressure correction value corresponding to the opening command when the opening command is determined to be smaller than the first preset opening command;
the control module 104 is used for controlling the air pressure of the boiler according to the primary air pressure correction value.
By adopting the device, the opening instruction of the hot air adjusting door of the coal mill is determined, and whether the opening instruction is smaller than the first preset opening instruction or not is determined, so that the primary air pressure correction value corresponding to the opening instruction can be determined under the condition that the opening instruction is smaller than the first preset opening instruction. The first preset opening instruction is a maximum opening instruction set before the primary air pressure is reduced on the basis that the output of the coal mill can meet the set load requirement after the primary air pressure is reduced, so that if the opening instruction is smaller than the first preset opening instruction, the value of the opening instruction can be increased on the basis that the output of the coal mill can meet the set load requirement. Wherein the value of the opening command is generally increased with a decrease in primary wind pressure, which in turn may result in a decrease in throttling losses. On the basis, the air pressure of the boiler can be controlled to be reduced according to the primary air pressure correction value corresponding to the opening command, so that the opening of the hot air adjusting door of the coal mill is dynamically increased along with the reduction of the air pressure of the boiler, and on the basis of meeting the set load requirement, the opening of the hot air adjusting door can be increased as much as possible, thereby reducing throttling loss and energy consumption of the boiler, and improving the efficiency of the boiler.
Optionally, the wind pressure control device 100 further includes a fourth determining module, where the fourth determining module is configured to determine the first preset opening command, and the fourth determining module is further configured to:
controlling the opening of the hot air adjusting door of the coal mill to change for a plurality of times according to a plurality of preset opening instructions in a preset opening instruction set, and reducing primary air pressure after changing the opening of the hot air adjusting door of the coal mill each time so as to determine whether the output of the coal mill can meet the set load requirement after reducing primary air pressure on the basis of the opening;
determining a maximum opening instruction which can meet the set load requirement after reducing the wind pressure once by the coal mill output from a preset opening instruction set;
and determining the maximum opening instruction as a first preset opening instruction.
Optionally, the second determining module 102 is further configured to:
and determining whether a target opening instruction with the largest opening instruction value among opening instructions of the hot air adjusting doors of the coal mills is smaller than a first preset opening instruction.
Optionally, the third determining module 103 is further configured to:
determining a primary wind pressure correction value according to the opening instruction and the first mapping relation;
the first mapping relation is used for representing the mapping relation between the opening instruction and the primary wind pressure correction value.
Optionally, the wind pressure control device 100 further includes a fifth determining module for:
under the condition that the opening instruction is determined to be larger than a first preset opening instruction, determining whether a candidate coal mill with the opening instruction larger than a second preset opening instruction exists or not; the second preset opening instruction is the upper limit of the opening instruction of the hot air adjusting door of the coal mill;
under the condition that the candidate coal mill exists, determining a difference value between an actual primary air quantity value and a primary air quantity set value of the candidate coal mill, wherein the primary air quantity set value is the primary air quantity corresponding to the set load requirement;
determining a target difference value with the largest difference value median of the plurality of candidate coal mills;
under the condition that the target difference value is larger than the preset air volume difference value, determining a primary air pressure correction value corresponding to the target difference value; the preset air volume difference value is the minimum air volume difference value that the output of the candidate coal mill cannot meet the set load requirement.
Optionally, the wind pressure control device 100 further includes a sixth determining module, where the sixth determining module is configured to determine a preset air volume difference value, and the sixth determining module is further configured to:
determining a plurality of preset primary air quantity set values according to a plurality of preset difference values in a preset air quantity difference value set and the primary air quantity actual value of the candidate coal mill;
Changing the primary air quantity set value of the candidate coal mill for a plurality of times according to a plurality of preset primary air quantity set values so as to change the difference value between the primary air quantity set value and the primary air quantity actual value for a plurality of times, and determining whether the output force of the candidate coal mill can meet the set load requirement after changing the primary air quantity set value each time;
determining a minimum air volume difference value which cannot meet the set load requirement of the candidate coal mill in the output after changing the primary air volume set value from a preset air volume difference value set;
and determining the minimum air volume difference value as a preset air volume difference value.
Optionally, the fifth determining module is further configured to:
determining a primary wind pressure correction value according to the target difference value and the second mapping relation;
the second mapping relation is used for representing the mapping relation between the target difference value and the primary wind pressure correction value.
Optionally, the control module 104 is further configured to:
determining a primary air pressure target set value according to the primary air pressure corrected value and the primary air pressure initial set value;
and controlling the air pressure of the boiler according to the primary air pressure target set value.
The specific manner in which the various modules perform the operations in the apparatus of the above embodiments have been described in detail in connection with the embodiments of the method, and will not be described in detail herein.
Fig. 6 is a block diagram of an electronic device 200, shown in accordance with an exemplary embodiment. As shown in fig. 6, the electronic device 200 may include: a processor 201, a memory 202. The electronic device 200 may also include one or more of a multimedia component 203, an input/output (I/O) interface 204, and a communication component 205.
The processor 201 is configured to control the overall operation of the electronic device 200 to perform all or part of the steps of the wind pressure control method described above. The memory 202 is used to store various types of data to support operation at the electronic device 200, which may include, for example, instructions for any application or method operating on the electronic device 200, as well as application-related data, such as contact data, messages sent and received, pictures, audio, video, and so forth. The Memory 202 may be implemented by any type or combination of volatile or non-volatile Memory devices, such as static random access Memory (Static Random Access Memory, SRAM for short), electrically erasable programmable Read-Only Memory (Electrically Erasable Programmable Read-Only Memory, EEPROM for short), erasable programmable Read-Only Memory (Erasable Programmable Read-Only Memory, EPROM for short), programmable Read-Only Memory (Programmable Read-Only Memory, PROM for short), read-Only Memory (ROM for short), magnetic Memory, flash Memory, magnetic disk, or optical disk. The multimedia component 203 may include a screen and an audio component. Wherein the screen may be, for example, a touch screen, the audio component being for outputting and/or inputting audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signals may be further stored in the memory 202 or transmitted through the communication component 205. The audio assembly further comprises at least one speaker for outputting audio signals. The I/O interface 204 provides an interface between the processor 201 and other interface modules, which may be a keyboard, mouse, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication component 205 is used for wired or wireless communication between the electronic device 200 and other devices. Wireless communication, such as Wi-Fi, bluetooth, near field communication (Near Field Communication, NFC for short), 2G, 3G, 4G, NB-IOT, eMTC, or other 5G, etc., or one or a combination of more of them, is not limited herein. The corresponding communication component 205 may thus comprise: wi-Fi module, bluetooth module, NFC module, etc.
In an exemplary embodiment, the electronic device 200 may be implemented by one or more application specific integrated circuits (Application Specific Integrated Circuit, abbreviated as ASIC), digital signal processor (Digital Signal Processor, abbreviated as DSP), digital signal processing device (Digital Signal Processing Device, abbreviated as DSPD), programmable logic device (Programmable Logic Device, abbreviated as PLD), field programmable gate array (Field Programmable Gate Array, abbreviated as FPGA), controller, microcontroller, microprocessor, or other electronic components for performing the wind pressure control method described above.
In another exemplary embodiment, a computer readable storage medium is also provided, comprising program instructions which, when executed by a processor, implement the steps of the wind pressure control method described above. For example, the computer readable storage medium may be the memory 202 including the program instructions described above, which may be executed by the processor 201 of the electronic device 200 to perform the wind pressure control method described above.
In another exemplary embodiment, a computer program product is also provided, which computer program product comprises a computer program executable by a programmable apparatus, the computer program having code portions for performing the wind pressure control method described above when being executed by the programmable apparatus.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.
Claims (9)
1. A wind pressure control method, the method comprising:
determining an opening instruction of a hot air adjusting door of the coal mill;
determining whether the opening instruction is smaller than a first preset opening instruction; the first preset opening instruction is a maximum opening instruction set before the primary air pressure is reduced on the basis that the output of the coal mill can meet the set load requirement after the primary air pressure is reduced;
Determining a primary air pressure correction value corresponding to the opening instruction under the condition that the opening instruction is smaller than the first preset opening instruction;
controlling the air pressure of the boiler according to the primary air pressure correction value;
the determining process of the first preset opening instruction includes:
controlling the opening of the hot air adjusting door of the coal mill to change for a plurality of times according to a plurality of preset opening instructions in a preset opening instruction set, reducing primary air pressure after changing the opening of the hot air adjusting door of the coal mill each time, and determining whether the output of the coal mill can meet the set load requirement after reducing primary air pressure on the basis of the opening;
determining a maximum opening instruction which can meet the set load requirement after reducing the wind pressure once by the coal mill output from the preset opening instruction set;
and determining the maximum opening instruction as the first preset opening instruction.
2. The method of claim 1, wherein the determining whether the opening command is less than a first preset opening command comprises:
and determining whether a target opening instruction with the largest opening instruction among the opening instructions of the hot air adjusting doors of the coal mill is smaller than a first preset opening instruction.
3. The method according to claim 1, wherein determining the primary air pressure correction value corresponding to the opening command includes:
determining a primary wind pressure correction value according to the opening command and the first mapping relation;
the first mapping relation is used for representing the mapping relation between the opening instruction and the primary wind pressure correction value.
4. The method according to claim 1, wherein the method further comprises:
under the condition that the opening instruction is determined to be larger than the first preset opening instruction, determining whether a candidate coal mill with the opening instruction larger than a second preset opening instruction exists or not; the second preset opening instruction is the upper limit of the opening instruction of the hot air adjusting door of the coal mill;
under the condition that the candidate coal mill exists, determining a difference value between an actual primary air quantity value and a primary air quantity set value of the candidate coal mill, wherein the primary air quantity set value is the primary air quantity corresponding to the set load requirement;
determining a target difference value with the largest difference value median among the plurality of candidate coal mills;
determining a primary air pressure correction value corresponding to the target difference value under the condition that the target difference value is larger than a preset air volume difference value; the preset air volume difference value is the minimum air volume difference value that the output of the candidate coal mill cannot meet the set load requirement.
5. The method of claim 4, wherein determining the preset air volume difference comprises:
determining a plurality of preset primary air quantity set values according to a plurality of preset difference values in a preset air quantity difference value set and the primary air quantity actual value of the candidate coal mill;
changing the primary air quantity set value of the candidate coal mill for a plurality of times according to a plurality of preset primary air quantity set values, so that the difference value between the primary air quantity set value and the primary air quantity actual value is changed for a plurality of times, and determining whether the output of the candidate coal mill can meet the set load requirement after changing the primary air quantity set value each time;
determining a minimum air volume difference value which cannot meet the set load requirement after the primary air volume set value is changed by the candidate coal mill output from the preset air volume difference value set;
and determining the minimum air volume difference value as the preset air volume difference value.
6. The method according to claim 4 or 5, wherein determining the primary air pressure correction value corresponding to the target difference value includes:
determining a primary wind pressure correction value according to the target difference value and a second mapping relation;
the second mapping relation is used for representing the mapping relation between the target difference value and the primary wind pressure correction value.
7. A wind pressure control device, the device comprising:
the first determining module is used for determining an opening instruction of a hot air adjusting door of the coal mill;
the second determining module is used for determining whether the opening instruction is smaller than a first preset opening instruction or not; the first preset opening instruction is a maximum opening instruction set before the primary air pressure is reduced on the basis that the output of the coal mill can meet the set load requirement after the primary air pressure is reduced;
the third determining module is used for determining a primary wind pressure correction value corresponding to the opening instruction under the condition that the opening instruction is smaller than the first preset opening instruction;
the control module is used for controlling the air pressure of the boiler according to the primary air pressure correction value;
the wind pressure control device further comprises a fourth determining module, wherein the fourth determining module is used for determining the first preset opening instruction, and the determining process of the first preset opening instruction comprises the following steps:
controlling the opening of the hot air adjusting door of the coal mill to change for a plurality of times according to a plurality of preset opening instructions in a preset opening instruction set, reducing primary air pressure after changing the opening of the hot air adjusting door of the coal mill each time, and determining whether the output of the coal mill can meet the set load requirement after reducing primary air pressure on the basis of the opening;
Determining a maximum opening instruction which can meet the set load requirement after reducing the wind pressure once by the coal mill output from the preset opening instruction set;
and determining the maximum opening instruction as the first preset opening instruction.
8. A non-transitory computer readable storage medium having stored thereon a computer program, characterized in that the program when executed by a processor realizes the steps of the method according to any of claims 1-6.
9. An electronic device, comprising:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to implement the steps of the method of any one of claims 1-6.
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