CN114017793B - Primary wind pressure control method and device - Google Patents
Primary wind pressure control method and device Download PDFInfo
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- CN114017793B CN114017793B CN202111094589.2A CN202111094589A CN114017793B CN 114017793 B CN114017793 B CN 114017793B CN 202111094589 A CN202111094589 A CN 202111094589A CN 114017793 B CN114017793 B CN 114017793B
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000003245 coal Substances 0.000 claims abstract description 77
- 230000001105 regulatory effect Effects 0.000 claims abstract description 48
- 230000009471 action Effects 0.000 claims description 7
- 230000002159 abnormal effect Effects 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 4
- 230000004913 activation Effects 0.000 claims 2
- 238000007789 sealing Methods 0.000 description 11
- 239000002817 coal dust Substances 0.000 description 4
- 238000005457 optimization Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000004069 differentiation Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- PDFKPHMIDDIXLR-UHFFFAOYSA-N fantrip Chemical compound FC1=C(F)C(F)=C2C=C(C=C3C4C5=CC6=CC7=C(F)C(F)=C(C(=C7C=C6C=C5C(C5=CC6=CC7=C(F)C(F)=C(F)C(F)=C7C=C6C=C54)C3=C3)F)F)C3=CC2=C1F PDFKPHMIDDIXLR-UHFFFAOYSA-N 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- 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
- F23L1/00—Passages or apertures for delivering primary air for combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
- F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
- F23N3/002—Regulating air supply or draught using electronic means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
- F23N3/007—Regulating air supply or draught using mechanical means
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Abstract
The invention discloses a one-time wind pressure control method and a device, wherein the method comprises the following steps: determining a primary air duct pressure set value according to the maximum coal feeding instruction value; correcting the primary air duct pressure set value according to the maximum opening value of the hot air adjusting baffle of the coal mill, the maximum opening value of the cold air adjusting baffle and the maximum opening value of the preset adjusting baffle, so that the primary air duct pressure set value is reduced; and adjusting primary air pressure according to the corrected primary air main pipe pressure set value so as to reduce the power consumption rate of the primary air fan. And the maximum opening value of the preset regulating baffle is determined by the maximum coal feeding command value. Therefore, the station service power of the unit is reduced and the economy of the unit is improved under the condition of ensuring the safe and stable operation of the unit.
Description
Technical Field
The application relates to the technical field of control of thermal generator sets, in particular to a primary wind pressure control method and device.
Background
Energy conservation and emission reduction are important strategic problems related to sustainable development of economy and society, and the power industry is not only a creator of high-quality clean energy, but also a consumer of primary energy consumption.
Thermal power generation is a generic term for heating water by using heat energy generated when fuel such as coal is combusted, converting the water into high-temperature and high-pressure steam, and then pushing a generator by the steam to generate electricity; the thermal generator set mainly comprises a boiler, a steam turbine, a generator, coal mills, a primary air fan, a DCS control system and other equipment, the coal mills of the thermal power plant are generally provided with corresponding primary air fans, the coal dust ground in the coal mills is blown into the boiler for combustion by primary air pressure provided by the primary air fans, the coal dust is combusted in a hearth and the released heat is output to the steam turbine, and the generator is driven to generate power. In the process, each coal mill adjusts the respective air inlet quantity through the self adjusting baffle plate (namely, the opening value of the adjusting baffle plate determines the air inlet quantity). In most cases, however, the opening degree of the cold and hot air baffles of each coal mill is lower than 50%, and large throttling loss exists.
Therefore, how to ensure that the plant power of the unit is reduced and the economy of the unit is improved under the condition of ensuring the safe and stable operation of the unit is a technical problem to be solved at present.
Disclosure of Invention
The invention provides a one-time wind pressure control method, which is used for solving the technical problem that the power consumption of a unit plant cannot be reduced and the economy of the unit is improved under the condition of ensuring the safe and stable operation of the unit in the prior art, and comprises the following steps:
Determining a primary air duct pressure set value according to the maximum coal feeding instruction value;
correcting the primary air duct pressure set value according to the maximum opening value of the hot air adjusting baffle of the coal mill, the maximum opening value of the cold air adjusting baffle and the maximum opening value of the preset adjusting baffle, so that the primary air duct pressure set value is reduced;
Adjusting primary air pressure according to the corrected primary air main pipe pressure set value so as to control primary air pressure of the coal mill;
and the maximum opening value of the preset regulating baffle is determined by the maximum coal feeding command value.
Preferably, the method further comprises:
Switching to a maximum cold air baffle opening controller when the maximum opening value of the hot air regulating baffle is smaller than a first preset percentage threshold value of the maximum opening value of the cold air regulating baffle;
and switching to the maximum hot air baffle opening controller when the maximum opening value of the hot air regulating baffle is larger than a first preset percentage threshold value of the maximum opening value of the cold air regulating baffle.
Preferably, when an abnormal working condition is detected, the first primary fan trips, the second primary fan trips, the primary air duct pressure is low, and when the primary air duct pressure is lower than a preset threshold value, the primary air duct pressure correction is cut off.
Preferably, after correcting the primary air duct pressure set value according to the maximum opening value of the hot air adjusting baffle of the coal mill, the maximum opening value of the cold air adjusting baffle and the maximum opening value of the preset adjusting baffle, the method further comprises:
Reducing the primary air duct pressure switch fixed value according to the corrected primary air duct pressure set value;
and when the corrected primary air duct pressure set value is detected to reach the switch set value, enabling the primary air duct pressure switch.
Preferably, after the primary air duct pressure set value is reduced, the interlocking starting pressure switch value of the sealing fan is reduced.
Correspondingly, the invention also provides a primary wind pressure control device, which comprises:
and a determination module: the primary air duct pressure set value is determined according to the maximum coal feeding instruction value;
And a correction module: the method comprises the steps of correcting a primary air duct pressure set value according to a maximum opening value of a hot air adjusting baffle of the coal mill, a maximum opening value of a cold air adjusting baffle and a maximum opening value of a preset adjusting baffle, so that the primary air duct pressure set value is reduced;
and an adjustment module: the primary air pressure is adjusted according to the corrected primary air main pipe pressure set value so as to control the primary air pressure of the coal mill;
the maximum opening value of the preset regulating baffle is determined by the maximum coal feeding command value.
Preferably, the method further comprises:
A first switching module: switching to a maximum cold air baffle opening controller when the maximum opening value of the hot air regulating baffle is smaller than a first preset percentage threshold value of the maximum opening value of the cold air regulating baffle;
And a second switching module: and switching to the maximum hot air baffle opening controller when the maximum opening value of the hot air regulating baffle is larger than a first preset percentage threshold value of the maximum opening value of the cold air regulating baffle.
Preferably, when an abnormal working condition is detected, the first primary fan trips, the second primary fan trips, the primary air duct pressure is low, and when the primary air duct pressure is lower than a preset threshold value, the primary air duct pressure correction is cut off.
Preferably, after correcting the primary air duct pressure set value according to the maximum opening value of the hot air adjusting baffle of the coal mill, the maximum opening value of the cold air adjusting baffle and the maximum opening value of the preset adjusting baffle, the method further comprises:
And a reduction module: the pressure switch fixed value is used for reducing the pressure switch fixed value of the primary air duct according to the corrected pressure set value of the primary air duct;
an enabling module: and when the corrected primary air duct pressure set value is detected to reach the switch set value, enabling the primary air duct pressure switch.
Preferably, after the primary air duct pressure set value is reduced, the interlocking starting pressure switch value of the sealing fan is reduced.
Compared with the prior art, the invention has the following beneficial effects:
The invention discloses a one-time wind pressure control method and a device, wherein the method comprises the following steps: determining a primary air duct pressure set value according to the maximum coal feeding instruction value; correcting the primary air duct pressure set value according to the maximum opening value of the hot air adjusting baffle of the coal mill, the maximum opening value of the cold air adjusting baffle and the maximum opening value of the preset adjusting baffle, so that the primary air duct pressure set value is reduced; and adjusting primary air pressure according to the corrected primary air main pipe pressure set value so as to reduce the power consumption rate of the primary air fan. And the maximum opening value of the preset regulating baffle is determined by the maximum coal feeding command value. Therefore, the station service power of the unit is reduced and the economy of the unit is improved under the condition of ensuring the safe and stable operation of the unit.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a primary wind pressure control method according to an embodiment of the present invention;
Fig. 2 shows a primary air fan current trend chart according to an embodiment of the present invention;
fig. 3 is a logic schematic diagram of a primary wind pressure control method according to an embodiment of the present invention;
fig. 4 shows a schematic structural diagram of a primary air pressure control device according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
As described in the background art, the opening degree of the cold and hot air baffle of each coal mill in the operation of the prior art unit is lower than 50%, and larger throttling loss exists. The energy is saved and the economy of the unit is improved under the condition that the safe and stable operation of the unit cannot be guaranteed.
In order to solve the above problems, an embodiment of the present application provides a method and an apparatus for controlling primary wind pressure, where the method includes: determining a primary air duct pressure set value according to the maximum coal feeding instruction value; correcting the primary air duct pressure set value according to the maximum opening value of the hot air adjusting baffle of the coal mill, the maximum opening value of the cold air adjusting baffle and the maximum opening value of the preset adjusting baffle, so that the primary air duct pressure set value is reduced; and adjusting primary air pressure according to the corrected primary air main pipe pressure set value so as to reduce the power consumption rate of the primary air fan. And the maximum opening value of the preset regulating baffle is determined by the maximum coal feeding command value. Therefore, the station service power of the unit is reduced and the economy of the unit is improved under the condition of ensuring the safe and stable operation of the unit.
As shown in fig. 1, a flow chart of a primary wind pressure control method according to an embodiment of the present invention is provided, where the method includes:
s101, determining a primary air duct pressure set value according to the maximum coal feeding instruction value.
Specifically, the coal mill is used for grinding raw coal into coal dust, the primary air blower provides primary air pressure for blowing the coal dust in the coal mill into the boiler, the type of raw coal, the coal feeding amount and other reasons can influence the working efficiency of the coal mill when the coal mill works, so that the opening value of the baffle of the coal mill is continuously changed, but under most conditions, the opening of the baffle of each coal mill is relatively low, the primary air duct pressure is regulated by adopting a primary air blower inlet regulating baffle, the primary air duct pressure set value is calculated by the maximum value of five coal feeder instructions through a function f max, and the primary air duct pressure set value is minimum to 6.5KPa. Hot air adjusting baffle plate of coal mill the primary air flow of the coal mill is regulated, cold air adjusting baffle plate of coal mill and adjusting the outlet temperature of the coal mill.
S102, correcting the pressure set value of the primary air duct according to the maximum opening value of the hot air adjusting baffle of the coal mill, the maximum opening value of the cold air adjusting baffle and the maximum opening value of the preset adjusting baffle, so that the pressure set minimum value of the primary air duct is reduced.
Specifically, according to the pump and fan power calculation formula n=q/3600×p/(1000×η), the flow Q and the pressure P are in a proportional relation with the fan power, and under the condition that the flow is fixed, the pressure is reduced as much as possible, so that the motor power can be reduced, and the power consumption of the primary fan is reduced. And calculating the maximum opening value of the hot air regulating baffle plate or the maximum opening value of the cold air regulating baffle plate and the maximum opening value of the preset regulating baffle plate of the coal mill through PID (proportion integration differentiation), and finally obtaining a corrected primary air main pressure set value, so that the primary air main pressure set value is reduced. And the pressure set value of the primary air duct can be adjusted and reduced to 4.5KPa, and the maximum opening value of the preset adjusting baffle is determined by the maximum coal feeding instruction value. As shown in FIG. 2, when the primary air blower main pipe pressure is reduced by 1KPa, the sum of the currents of the two primary air blowers can be reduced by 8A, and at least 70 ten thousand KW.h of electric energy can be saved by a single unit.
In order to ensure stable operation of the unit, in a preferred embodiment of the present solution, after correcting the primary air duct pressure set value according to the maximum opening value of the hot air adjusting baffle, the maximum opening value of the cold air adjusting baffle, and the maximum opening value of the preset adjusting baffle of the coal pulverizer, the method further includes:
Reducing the primary air duct pressure switch fixed value according to the corrected primary air duct pressure set value;
and when the corrected primary air duct pressure set value is detected to reach the switch set value, enabling the primary air duct pressure switch.
Specifically, after the primary air duct pressure set value is reduced, during the deep peak shaving, the primary air pressure is lower, the primary air pressure low-switching action can be triggered, the primary air duct pressure switch set value is reduced to be 3KPa for avoiding the triggering of the protection action, and when the primary air duct pressure value is detected to reach the switch set value in the unit operation process, the primary air duct pressure switch is started to protect the unit to stably operate.
It should be noted that, the scheme of the above preferred embodiment is only one specific implementation scheme provided by the present application, and other modes of reducing the pressure switch constant value of the primary air duct to make the unit stably operate are all within the protection scope of the present application.
In order to ensure stable operation of the unit, in a preferred embodiment of the scheme, after the pressure set value of the primary air duct is reduced, the interlocking start pressure switch value of the sealing fan is reduced.
Specifically, as the primary air main pipe pressure is reduced, the inlet pressure of the sealing fan is reduced, so that the sealing air pressure is reduced, and the sealing fans can possibly be linked, the interlocking starting pressure switch value (set to 9 KPa) of the sealing fans is further required to be reduced. Or the switch is set as a differential pressure switch, and the differential pressure between primary wind pressure and sealing wind is taken (the differential pressure is smaller than 4KPa, and the standby sealing fan is started in an interlocking way). Through the mode, the stable operation of the unit can be ensured.
It should be noted that, the scheme of the above preferred embodiment is only one specific implementation scheme provided by the present application, and other modes of reducing the interlocking start pressure switch value of the sealing fan to make the unit operate stably are all within the protection scope of the present application.
And S103, adjusting the primary air pressure according to the corrected primary air duct pressure set value so as to control the primary air pressure of the coal mill.
Specifically, the primary air pressure is adjusted according to the corrected primary air duct pressure set value so as to control the primary air pressure of the coal mill. The cold and hot air baffles of the coal mill are maintained at a larger opening degree under the conditions of ensuring that the primary air flow of the coal mill is unchanged and the outlet temperature is controllable, so that the throttling loss of the baffles and the pressure head loss of a fan are reduced to the maximum extent, and the energy is saved.
In order to save energy and improve the economy of the unit, in a preferred embodiment of the scheme, the method further comprises the following steps:
Switching to a maximum cold air baffle opening controller when the maximum opening value of the hot air regulating baffle is smaller than a first preset percentage threshold value of the maximum opening value of the cold air regulating baffle;
and switching to the maximum hot air baffle opening controller when the maximum opening value of the hot air regulating baffle is larger than a first preset percentage threshold value of the maximum opening value of the cold air regulating baffle.
Specifically, when the maximum opening value of the hot air baffle is 10% smaller than the maximum opening value of the cold air baffle, the PID controller is switched to the maximum cold air baffle opening controller, and the cold air adjusting baffle adjusts the outlet temperature of the coal mill, so that when the primary air main pipe pressure set value is corrected, the correction speed is slower, and the maximum cold air baffle opening controller is adopted. And when the maximum opening value of the hot air baffle is 10% greater than that of the cold air baffle, the PID controller is switched to the maximum hot air baffle opening controller. Because the hot air adjusting baffle plate of the coal mill adjusts the primary air flow of the coal mill, the correction speed is required to be rapid, and the maximum hot air baffle opening controller is adopted. Therefore, the cold and hot air baffles of the coal mill can be maintained at a larger opening degree under the conditions of unchanged primary air flow and controllable outlet temperature of the coal mill, and the throttling loss of the baffles and the pressure head loss of the fan are reduced to the greatest extent.
In order to ensure stable operation of the unit, in a preferred embodiment of the present solution, when an abnormal condition is detected, the primary air blower trips, the secondary air blower trips, the primary air duct pressure is switched on and off, and when the primary air duct pressure is lower than a preset threshold value, the primary air duct pressure correction is cut off.
Specifically, a primary wind pressure setting optimization adjustment switching button is added on a DCS interface, meanwhile, a safety factor is considered, a primary fan trip is added, a primary air duct pressure low switch action is added, when the primary air duct pressure is lower than a preset threshold value, a primary wind pressure setting optimization adjustment function is automatically cut off, and after cutting off, a unit operates according to a primary air duct pressure set value, so that safe operation of the unit is ensured.
By applying the technical scheme, the invention discloses a one-time wind pressure control method, which comprises the following steps: determining a primary air duct pressure set value according to the maximum coal feeding instruction value; correcting the primary air duct pressure set value according to the maximum opening value of the hot air adjusting baffle of the coal mill, the maximum opening value of the cold air adjusting baffle and the maximum opening value of the preset adjusting baffle, so that the primary air duct pressure set value is reduced; and adjusting primary air pressure according to the corrected primary air main pipe pressure set value so as to reduce the power consumption rate of the primary air fan. And the maximum opening value of the preset regulating baffle is determined by the maximum coal feeding command value. Therefore, the station service power of the unit is reduced and the economy of the unit is improved under the condition of ensuring the safe and stable operation of the unit.
In order to further explain the technical idea of the invention, the technical scheme of the invention is described with specific application scenarios.
As shown in fig. 3, a logic diagram of a primary wind pressure control method is shown, according to a pump and fan power calculation formula n=q/3600×p/(1000×η), flow Q and pressure P are in a proportional relationship with fan power, and under a certain flow condition, the pressure is reduced as much as possible, so that the motor power can be reduced, and the primary fan power consumption can be reduced. And calculating the maximum opening value of the hot air regulating baffle plate, the maximum opening value of the cold air regulating baffle plate and the maximum opening value of the preset regulating baffle plate of the coal mill through PID (proportion integration differentiation), and finally obtaining a corrected primary air main pressure set value, so that the primary air main pressure set value is reduced. And adjusting the primary air pressure according to the corrected primary air main pipe pressure set minimum value so as to control the primary air pressure of the coal mill. The cold and hot air baffles of the coal mill are maintained at a larger opening degree under the conditions of ensuring that the primary air flow of the coal mill is unchanged and the outlet temperature is controllable, so that the throttling loss of the baffles and the pressure head loss of a fan are reduced to the maximum extent, and the energy is saved.
When the maximum opening value of the hot air regulating baffle is 10% smaller than that of the cold air regulating baffle, the PID controller is switched to the maximum cold air regulating baffle opening controller; and when the maximum opening value of the hot air regulating baffle is 10% greater than that of the cold air regulating baffle, the PID controller is switched to the maximum hot air regulating baffle opening controller. The cold and hot air baffles of the coal mill are ensured to be maintained at a larger opening degree, the energy consumption is reduced, the economy of the unit is improved, meanwhile, a primary air pressure setting optimization adjustment switch button is added on a DCS interface, meanwhile, the safety factor is considered, the functions of tripping of an A/B primary air blower, low pressure of a primary air duct and low pressure switching action of the primary air duct are removed, the primary air pressure setting optimization adjustment function is removed, and after the primary air duct is removed, the unit operates according to a primary air duct pressure set value, so that the safe operation of the unit is ensured.
In order to achieve the above technical objective, an embodiment of the present application further provides a primary wind pressure control device, as shown in fig. 4, where the device includes:
determination module 201: the primary air duct pressure set value is determined according to the maximum coal feeding instruction value;
Correction module 202: the method comprises the steps of correcting a primary air duct pressure set value according to a maximum opening value of a hot air adjusting baffle of the coal mill, a maximum opening value of a cold air adjusting baffle and a maximum opening value of a preset adjusting baffle, so that the primary air duct pressure set value is reduced;
the adjustment module 203: the primary air pressure is adjusted according to the corrected primary air main pipe pressure set value so as to control the primary air pressure of the coal mill;
and the maximum opening value of the preset regulating baffle is determined by the maximum coal feeding command value.
In a specific application scenario, the method further includes:
A first switching module: switching to a maximum cold air baffle opening controller when the maximum opening value of the hot air regulating baffle is smaller than a first preset percentage threshold value of the maximum opening value of the cold air regulating baffle;
And a second switching module: and switching to the maximum hot air baffle opening controller when the maximum opening value of the hot air regulating baffle is larger than a first preset percentage threshold value of the maximum opening value of the cold air regulating baffle.
In a specific application scenario, when an abnormal working condition is detected, tripping a first primary fan, tripping a second primary fan, performing a primary air duct pressure low-switching action, and cutting off the primary air duct pressure correction when the primary air duct pressure is lower than a preset threshold value.
In a specific application scenario, after correcting the primary air main pressure set value according to the maximum opening value of the hot air adjusting baffle of the coal mill, the maximum opening value of the cold air adjusting baffle and the maximum opening value of the preset adjusting baffle, the method further comprises:
And a reduction module: the pressure switch fixed value is used for reducing the pressure switch fixed value of the primary air duct according to the corrected pressure set value of the primary air duct;
an enabling module: and when the corrected primary air duct pressure set value is detected to reach the switch set value, enabling the primary air duct pressure switch.
In a specific application scenario, after the pressure set value of the primary air duct is reduced, the interlocking starting pressure switch value of the sealing fan is reduced.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be appreciated by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not drive the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (4)
1. A primary air pressure control method, the method comprising:
Determining a primary air duct pressure set value according to the maximum coal feeding instruction value;
According to the maximum opening value of the hot air adjusting baffle plate and the maximum opening value of the cold air adjusting baffle plate of the coal mill and the preset adjusting baffle plate
Correcting the primary air duct pressure set value by using a maximum opening value to reduce the primary air duct pressure set value;
Adjusting primary air pressure according to the corrected primary air main pipe pressure set value so as to control primary air pressure of the coal mill;
the maximum opening value of the preset regulating baffle is determined by the maximum coal feeding instruction value;
When the maximum opening value of the hot air regulating baffle is smaller than a first preset percentage threshold value of the maximum opening value of the cold air regulating baffle, switching to a maximum cold air baffle opening controller;
switching to a maximum hot air baffle opening controller when the maximum opening value of the hot air regulating baffle is larger than a first preset percentage threshold value of the maximum opening value of the cold air regulating baffle;
when abnormal working conditions are detected, tripping a first primary fan, tripping a second primary fan, performing primary air duct pressure low-switching action, and cutting off primary air duct pressure correction when the primary air duct pressure is lower than a preset threshold value;
After correcting the primary air duct pressure set value according to the maximum opening value of the hot air adjusting baffle of the coal mill, the maximum opening value of the cold air adjusting baffle and the maximum opening value of the preset adjusting baffle, the method further comprises the following steps:
reducing the primary air duct pressure switch fixed value according to the corrected primary air duct pressure set value;
and when the corrected primary air duct pressure set value is detected to reach the switch set value, enabling a primary air duct pressure switch.
2. The method of claim 1, wherein the primary air header pressure set point is reduced and then the seal fan interlock activation pressure switch value is reduced.
3. A primary air pressure control device, the device comprising:
and a determination module: the primary air duct pressure set value is determined according to the maximum coal feeding instruction value;
And a correction module: the method comprises the steps of correcting a primary air main pressure set value according to a maximum opening value of a hot air adjusting baffle of a coal mill, a maximum opening value of a cold air adjusting baffle and a maximum opening value of a preset adjusting baffle, so that the primary air main pressure set value is reduced;
and an adjustment module: the primary air pressure is adjusted according to the corrected primary air main pipe pressure set value so as to control the primary air pressure of the coal mill;
The maximum opening value of the preset regulating baffle is determined by the maximum coal feeding command value;
When the maximum opening value of the hot air regulating baffle is smaller than a first preset percentage threshold value of the maximum opening value of the cold air regulating baffle, switching to a maximum cold air baffle opening controller;
switching to a maximum hot air baffle opening controller when the maximum opening value of the hot air regulating baffle is larger than a first preset percentage threshold value of the maximum opening value of the cold air regulating baffle;
when abnormal working conditions are detected, tripping a first primary fan, tripping a second primary fan, performing primary air duct pressure low-switching action, and cutting off primary air duct pressure correction when the primary air duct pressure is lower than a preset threshold value;
After correcting the primary air duct pressure set value according to the maximum opening value of the hot air adjusting baffle of the coal mill, the maximum opening value of the cold air adjusting baffle and the maximum opening value of the preset adjusting baffle, the method further comprises the following steps:
and a reduction module: the pressure switch fixed value of the primary air duct is reduced according to the corrected pressure set value of the primary air duct;
an enabling module: and when the corrected primary air duct pressure set value is detected to reach the switch set value, enabling a primary air duct pressure switch.
4. The apparatus of claim 3 wherein the primary air duct pressure set point is reduced and then the seal fan interlock activation pressure switch value is reduced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111094589.2A CN114017793B (en) | 2021-09-17 | 2021-09-17 | Primary wind pressure control method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111094589.2A CN114017793B (en) | 2021-09-17 | 2021-09-17 | Primary wind pressure control method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114017793A CN114017793A (en) | 2022-02-08 |
| CN114017793B true CN114017793B (en) | 2024-11-05 |
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| CN103712235A (en) * | 2013-12-26 | 2014-04-09 | 广东电网公司电力科学研究院 | Primary air fan controlling method and device |
| CN110701634A (en) * | 2019-09-18 | 2020-01-17 | 上海发电设备成套设计研究院有限责任公司 | Primary air pressure control system and control method thereof |
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| CN109681910B (en) * | 2018-12-24 | 2020-10-02 | 中国神华能源股份有限公司 | Method and device for regulating pressure |
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| CN103712235A (en) * | 2013-12-26 | 2014-04-09 | 广东电网公司电力科学研究院 | Primary air fan controlling method and device |
| CN110701634A (en) * | 2019-09-18 | 2020-01-17 | 上海发电设备成套设计研究院有限责任公司 | Primary air pressure control system and control method thereof |
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