CN112228381A - Variable-frequency movable vane coordination control method for movable vane adjustable fan - Google Patents
Variable-frequency movable vane coordination control method for movable vane adjustable fan Download PDFInfo
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- CN112228381A CN112228381A CN202011310892.7A CN202011310892A CN112228381A CN 112228381 A CN112228381 A CN 112228381A CN 202011310892 A CN202011310892 A CN 202011310892A CN 112228381 A CN112228381 A CN 112228381A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/002—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying geometry within the pumps, e.g. by adjusting vanes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/34—Blade mountings
- F04D29/36—Blade mountings adjustable
- F04D29/362—Blade mountings adjustable during rotation
Abstract
A frequency conversion movable vane coordination control method for a movable vane adjustable fan. The invention provides a variable-frequency and movable vane coordinated control technology of a movable air conditioner, which ensures that the negative pressure of a hearth is maintained near a set value by automatically adjusting the running speed of a high-voltage high-power variable-frequency speed regulation device, adjusts the opening of a movable vane by an actual running speed range, and further ensures that an induced draft fan works at an optimal efficiency point.
Description
Technical Field
The invention relates to a movable blade adjustable fan, in particular to a frequency conversion movable blade coordination control method for a movable blade adjustable fan.
Background
In China, the fan development is from a traditional centrifugal fan to an early stationary blade adjustable axial flow fan and then to a movable blade adjustable axial flow fan which is gradually and widely applied at present, the efficiency of the fan is gradually improved, the control of the fan output air volume can be realized through the control of the installation angle of the blades of the fan to replace the traditional throttle/baffle throttling regulation mode, the fan is widely applied to the movable blade adjustable axial flow fan matched with a thermal power generating set at present, generally, the movable blade adjustable axial flow fan matched with a boiler is not operated at the best economic operation working point of the fan design from two aspects of the actual operation condition of the matched movable blade adjustable axial flow fan and the design technical specification of a thermal power plant, and in the operation of the thermal power generating set, the thermal power generating set is required to realize peak regulation operation according to the unit required by a power grid company due to the requirement of the load of the power grid, the flow-pressure curve and the efficiency curve of the movable blade adjustable axial flow fan can be obtained, when the load is reduced, the efficiency of the corresponding fan is reduced, so that most of movable blade adjustable axial flow draught fans matched with boilers are enabled to be operated more deviated from the designed optimal economic operation working point, based on the two conditions, the operation mode of the movable blade adjustable axial flow draught fans matched with the movable blade adjustable axial flow draught fans in most of thermal power plants at present is uneconomical, and the variable frequency modification of the movable blade adjustable axial flow draught fans is feasible to realize energy conservation and consumption reduction, the potential electricity-saving space is generally 20 percent or even higher, more application examples are provided for the variable frequency modification of the fixed blade adjustable axial flow draught fans at present in China, and the movable blade adjustable axial flow draught fans are relatively high in efficiency, and the variable frequency modification cases of the.
In view of the above background problems, the present invention provides a variable frequency speed regulation device for a movable blade adjustable fan and a corresponding variable frequency and movable blade installation angle regulation coordination control method which aims at controlling the negative pressure of a boiler furnace and maximizing the efficiency of the movable blade adjustable fan.
Disclosure of Invention
The invention provides a variable-frequency movable blade coordination control method for a movable blade adjustable fan, and particularly provides a DCS movable blade control method for movable blade variable-frequency coordination control, which is suitable for high-efficiency and safe operation of an induced draft fan system on the basis of well controlling negative pressure of a hearth after variable-frequency transformation of the movable blade adjustable fan of a power station boiler system.
The invention is realized by the following technical scheme:
a frequency conversion movable blade coordination control method for a movable blade adjustable fan is applied to a DCS induced draft fan control system, wherein the DCS induced draft fan control system comprises a frequency command control area, a frequency, current and running state feedback area, a movable blade installation angle control area and a fan state feedback area; the frequency command control area controls the high-voltage high-power variable-frequency speed regulation device, and the frequency, current and running state feedback area receives feedback information of the high-voltage high-power variable-frequency speed regulation device; the movable blade installation angle control area controls the movable blade adjustable induced draft fan, and the fan state feedback area receives feedback information of the movable blade adjustable induced draft fan; the DCS movable blade fan control system for the movable blade frequency conversion coordination control of the induced draft fan system, which runs efficiently and safely on the basis of well controlling the negative pressure of the hearth, increases the running economy of the movable induced draft fan on the basis of not reducing the reliability of the system, reduces the plant power consumption rate, realizes energy conservation and emission reduction, and the frequency conversion movable blade coordination control method of the movable blade adjustable fan comprises the following steps:
s1, the DCS draught fan control system sends out an instruction for controlling the running frequency of the frequency converter after obtaining a contrast value of a preset furnace cavity negative pressure parameter and an actual furnace cavity negative pressure parameter according to the requirement change of the furnace cavity negative pressure;
s2: according to the sent instruction for controlling the running frequency of the frequency converter, the instruction for controlling the running frequency of the frequency converter is input into a high-voltage high-power frequency-variable speed regulation device, and the high-voltage high-power frequency-variable speed regulation device regulates the running speed of the movable blade adjustable induced draft fan;
s3: setting a dead zone between the speed sections of the high-voltage high-power variable-frequency speed regulation device, wherein the dead zone is set to be +/-1% of rated speed, readjusting the set value of the angle of the movable blade if the speed of the high-voltage high-power variable-frequency speed regulation device passes through the dead zone within the range of +/-1%, and otherwise, performing the step S5 to adjust the angle of the movable blade to the set value of the system;
s4: looking up a table of the operating speed of the movable vane adjustable induced draft fan in the step S2 to obtain a set movable vane angle value;
s5: after the set movable blade angle value is obtained, the blade angle is adjusted to be close to the set value of the movable blade angle;
s6: comparing the set value of the movable blade angle with the actual value of the movable blade angle of the movable adjusting fan, stopping adjusting the movable blade angle if the actual value of the movable blade angle is consistent with the set value of the system, otherwise returning to the step S5 to readjust the movable blade angle to reach the set value;
s7: after the movable blade angle reaches a set value, judging whether the negative pressure requirement of the hearth is met or not according to the comparison between the hearth negative pressure preset parameter and the actual hearth negative pressure parameter;
if the negative pressure requirement of the hearth is met, fixing the variable frequency speed and the movable blade angle;
and if the negative pressure requirement of the hearth is not met, returning to the step S2 to readjust the operating frequency of the high-voltage high-power variable-frequency speed regulation device.
And further, the method also comprises a frequency conversion fault switching power frequency control method, after the high-voltage high-power frequency conversion speed regulation device has a fault, before the high-voltage high-power frequency conversion speed regulation device completes power frequency switching, the DCS rapidly adjusts the angle of the movable blade fan to the angle range of the movable blade in power frequency operation according to the fan characteristics and the actual value of the current air quantity and air pressure, so as to adapt to the requirement of the air quantity and air pressure after the power frequency rotation speed is switched, and after the high-voltage high-power frequency conversion speed regulation device is synchronously switched to the power.
Further, the method also comprises a control method for normally switching power frequency of the frequency converter: after a variable-cutting instruction is manually given, before the frequency converter automatically finishes variable-cutting switching, the DCS movable blade draught fan control system enters a variable-cutting automatic tracking mode, after the variable-cutting automatic tracking mode enters the mode, the DCS gradually increases the variable-frequency operating speed to the power-frequency operating speed, after the variable-frequency speed rises by 5%, the negative pressure of the hearth is automatically adjusted and stabilized through the movable blades, and after the variable-frequency operating fan speed is adjusted to the power-frequency operating speed and the negative pressure of the hearth is stable and meets requirements, the variable-cutting instruction is sent to the frequency converter.
The system further comprises a power frequency switching frequency conversion control method, wherein an operator cuts an instruction, the frequency converter automatically completes power frequency switching frequency conversion operation, after the switching is completed, the frequency of the frequency converter is kept at 100%, the DCS movable blade fan control system enters a frequency conversion automatic tracking mode, the frequency conversion operation rotating speed is adjusted according to the air quantity requirement, the movable blade is automatically adjusted to stabilize the negative pressure of the hearth after the frequency conversion rotating speed is reduced by rated 5%, and after the rotating speed and the angle of the movable blade enter a frequency conversion movable blade coordination control interval, the DCS movable blade fan guide control system enters frequency conversion movable blade coordination control logic.
Further, when RB appears in the hearth and the frequency of the frequency converter needs to be adjusted quickly, the DCS movable blade fan control system exits from a normal frequency conversion adjustment mode, the angle of the movable blade is kept unchanged, the frequency of the frequency converter is adjusted quickly, and the state required by the running of the unit is achieved; after the state of the machine set is stable, the adjusting mode can be manually switched back to the variable frequency adjusting mode.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention relates to a variable-frequency movable vane coordination control method for a movable vane adjustable fan, which aims at controlling the negative pressure of a boiler hearth and maximizes the efficiency of the movable vane adjustable fan.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic view of the apparatus of the present invention.
FIG. 2 is a flow chart of the steps of the coordinated control of the variable frequency rotor blades according to the present invention.
FIG. 3 is a flowchart illustrating steps of a power frequency control method for a frequency conversion fault switch in an embodiment.
FIG. 4 is a flowchart illustrating steps of a normal power frequency switching control method for a frequency converter according to an embodiment of the present disclosure.
FIG. 5 is a flowchart illustrating steps of a power frequency switching and frequency conversion control method according to an embodiment of the present invention.
FIG. 6 is a graph illustrating a first variation of bucket angle versus speed.
FIG. 7 is a diagram showing a relationship between a change in angle and a second change in speed of a rotor blade
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Examples
Referring to fig. 1, a system for coordinating and controlling a variable-frequency movable blade of a movable blade-adjustable fan includes a power supply circuit breaker, a high-voltage high-power variable-frequency speed regulation device, a power frequency bypass, a motor, a DCS system, and a movable blade-adjustable axial flow fan, wherein the high-voltage high-power variable-frequency speed regulation device is connected in parallel with the power frequency bypass, two ends of the parallel connected device are respectively connected to the power supply circuit breaker and the motor, the motor is connected to the movable blade-adjustable axial flow fan, the DCS system is electrically connected to a control unit of the high-voltage high-power variable-frequency speed regulation device and a control unit of a movable blade-adjustable induced fan, and the control system of the DCS induced fan adjusts an operation frequency command of the variable-.
The upper DCS module collects furnace negative pressure, fan flow, pressure, medium temperature and density of a boiler, the operating frequency and output current of a frequency converter, vibration quantity of each position of a motor and bearing oil temperature, vibration state information of each position of an axial flow induced draft fan adjustable by a movable blade, a frequency conversion operating frequency instruction command is output according to a furnace negative pressure reference value and an actual value, the operating frequency instruction is sent to a high-voltage high-power frequency conversion speed regulating device, and then the high-voltage high-power frequency conversion speed regulating device starts to drive a motor to operate to a given rotating speed; in the process that the high-voltage high-power variable-frequency speed regulation device operates to a specified rotating speed, a movable blade angle opening instruction is output to a movable blade adjusting mechanism of the movable blade adjustable axial flow draught fan according to the operating speed of the movable blade adjustable axial flow draught fan and a movable blade angle instruction function, then the movable blade angle of the movable blade adjustable axial flow draught fan is adjusted to a set value by the mechanism, the high-voltage high-power variable-frequency speed regulation device drives a motor to rotate to the set rotating speed according to the rotating speed instruction of an upper DCS, meanwhile, a power change switching instruction of the upper DCS is received, and each switch in a bypass cabinet is controlled to be normally switched on.
Further, the frequency conversion movable vane coordination control system for the movable vane adjustable fan comprises a power frequency movable vane adjustment mode and a frequency conversion movable vane coordination control mode. When the high-voltage high-power variable-frequency speed regulation device has a heavy fault or the unit is in a full-load power generation state for a long time, the control system adopts a power frequency movable blade regulation mode; when the frequency conversion device is normal, the control system can adopt a frequency conversion movable vane coordination control mode to improve the operation efficiency of the fan system.
Further, power frequency movable vane regulation mode, draught fan motor are supplied power by the mill with 6kV 10kV generating line through the bypass cabinet to rated speed operation realizes stabilizing the purpose of furnace negative pressure through controlling movable vane mounting angle, and the output of furnace negative pressure stabilization module is movable vane aperture instruction promptly.
Further, referring to fig. 6 and 7, in order to improve the efficiency of the dynamic air conditioner in the whole rotational speed section, the variable frequency movable vane coordination control strategy adopts a mode of adjusting two variables of the rotational speed and the vane angle. The adjustment idea is as follows: the rotating speed of the fan is adjusted by the high-voltage high-power variable-frequency speed adjusting device, the movable blade adjustable fan is freely adjusted in a full frequency band, 6 angle points are preset in the movable blade adjustable fan, and when the rotating speed reaches a certain range, the blades are automatically arranged at the corresponding angle points. Referring to fig. 2, a DCS induced draft fan control system outputs an operation frequency command of a high-voltage high-power variable frequency speed control device through a PID controller according to a set negative pressure parameter of a furnace and an actual negative pressure of the furnace collected by a negative pressure collecting sensor of the furnace, and then inputs the variable frequency operation command into a variable frequency movable blade coordination control mode in which the movable blade angle is an inner ring and the operation speed is an outer ring, the outer ring adjustment is performed only after the inner ring adjustment in the control loop is completed, simultaneous adjustment is avoided, a dead zone is set between speed sections, the dead zone is set to be ± 1% of a rated speed, the movable blade angle is readjusted only through the dead zone between two speed ranges, and frequent adjustment of the movable blades is avoided, and:
s1, the DCS draught fan control system sends out an instruction for controlling the operation frequency of the high-voltage high-power variable-frequency speed regulation device after obtaining a contrast value of a preset furnace negative pressure parameter and an actual furnace negative pressure parameter according to the requirement change of the furnace negative pressure;
s2: according to the sent instruction for controlling the operating frequency of the high-voltage high-power frequency conversion speed regulation device, the instruction for controlling the operating frequency of the high-voltage high-power frequency conversion speed regulation device is input into the high-voltage high-power frequency conversion speed regulation device, and the high-voltage high-power frequency conversion speed regulation device regulates the operating speed;
s3: setting a dead zone between the speed sections of the high-voltage high-power variable-frequency speed regulation device, wherein the dead zone is set to be +/-1% of rated speed, readjusting the set value of the angle of the movable blade if the speed of the high-voltage high-power variable-frequency speed regulation device passes through the dead zone within the range of +/-1%, and otherwise, performing the step S5 to adjust the angle of the movable blade to the set value;
s4: obtaining a set movable blade angle value after adjusting the movable blade angle;
s5: after the set movable blade angle data are obtained, the blade angle is adjusted to be close to the set value of the movable blade angle;
s6: comparing the set value of the approaching moving blade angle with preset system data, if the set value of the approaching moving blade angle is consistent with the preset system data, setting the set value angle of the approaching moving blade angle as the set value of the moving blade angle, otherwise returning to the step S5 to readjust the moving blade angle to obtain the set value of the blade angle;
s7: after the set value of the movable blade angle is obtained, whether the requirement of a negative pressure hearth of the hearth is met is detected;
if the negative pressure requirement of the hearth is met, fixing the variable frequency speed and the movable blade angle;
and if the negative pressure requirement of the hearth is not met, returning to the step S2 to readjust the operating frequency of the high-voltage high-power variable-frequency speed regulation device.
Further, referring to fig. 3, when a heavy fault or a generator set operates in a high load state for a long time, the induced draft fan control system needs to be switched to a power frequency control mode. When a high-voltage high-power variable-frequency speed regulation device has a heavy fault, firstly, a DCS draught fan control system rapidly adjusts the angle of a movable blade fan to a power frequency operation movable blade angle range according to fan characteristics and a current air volume and air pressure actual value to adapt to the air volume and air pressure requirement after switching to a power frequency rotation speed, and then, after a synchronous device successfully switches a draught fan motor to a power frequency state to operate, the DCS draught fan control system enters a power frequency movable blade regulation mode. Referring to fig. 4, according to the operation requirement of the unit, when the frequency conversion of the induced draft fan needs to be switched to the power frequency operation, the induced draft fan enters the automatic variable-frequency-switching-work tracking mode, the rotation speed of the motor is gradually adjusted to 100%, and after the rotation speed reaches the rated rotation speed and the movable blades are automatically adjusted to stabilize the negative pressure of the furnace and meet the requirement, the control system of the induced draft fan enters the power frequency adjustment mode, then sends a variable-frequency-switching-work instruction to the high-voltage high-power frequency conversion speed adjusting device, and then the operation is switched to.
Further, referring to fig. 5, in the power frequency mode, when the frequency conversion operation needs to be switched, an operator cuts a command, the high-voltage high-power frequency conversion speed regulation device automatically completes the power frequency switching frequency conversion operation, after the switching is completed, the frequency of the high-voltage high-power frequency conversion speed regulation device is kept at 100%, the DCS draught fan control system enters the power cutting automatic tracking mode, the rotating speed is gradually reduced to the frequency conversion operating rotating speed, then the furnace negative pressure stabilization requirement is met by adjusting the opening degree of the movable blade, after the frequency conversion rotating speed and the opening degree of the movable blade are adjusted to the frequency conversion mode gear, the operating rotating speed and the opening degree of the movable blade of the movable wind turbine are fixed, and then the DCS draught.
The invention provides a variable-frequency and movable blade coordinated control technology of a movable blade adjustable fan, which can ensure that the negative pressure of a hearth is maintained near a set value by automatically adjusting the running speed of a high-voltage high-power variable-frequency speed adjusting device, and adjust the opening of the movable blade through an actual running speed range, thereby ensuring that an induced draft fan works at an optimal efficiency point.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. A frequency conversion movable blade coordination control method for a movable blade adjustable fan is applied to a DCS induced draft fan control system, wherein the DCS induced draft fan control system comprises a frequency command control area, a frequency, current and running state feedback area, a movable blade installation angle control area and a fan state feedback area; the frequency command control area controls the high-voltage high-power variable-frequency speed regulation device, and the frequency, current and running state feedback area receives feedback information of the high-voltage high-power variable-frequency speed regulation device; the movable blade installation angle control area controls the movable blade adjustable induced draft fan, and the fan state feedback area receives feedback information of the movable blade adjustable induced draft fan; the method for coordinately controlling the variable-frequency movable vane of the movable vane adjustable fan comprises the following steps:
s1, the DCS draught fan control system sends out an instruction for controlling the running frequency of the frequency converter after obtaining a contrast value of a preset furnace cavity negative pressure parameter and an actual furnace cavity negative pressure parameter according to the requirement change of the furnace cavity negative pressure;
s2: according to the sent instruction for controlling the running frequency of the frequency converter, the instruction for controlling the running frequency of the frequency converter is input into a high-voltage high-power frequency-variable speed regulation device, and the high-voltage high-power frequency-variable speed regulation device regulates the running speed of the movable blade adjustable induced draft fan;
s3: setting a dead zone between the speed sections of the high-voltage high-power variable-frequency speed regulation device, wherein the dead zone is set to be +/-1% of rated speed, readjusting the set value of the angle of the movable blade if the speed of the high-voltage high-power variable-frequency speed regulation device passes through the dead zone within the range of +/-1%, and otherwise, performing the step S5 to adjust the angle of the movable blade to the set value of the system;
s4: looking up a table of the operating speed of the movable vane adjustable induced draft fan in the step S2 to obtain a set movable vane angle value;
s5: after the set movable blade angle value is obtained, the blade angle is adjusted to be close to the set value of the movable blade angle;
s6: comparing the set value of the movable blade angle with the actual value of the movable blade angle of the movable adjusting fan, stopping adjusting the movable blade angle if the actual value of the movable blade angle is consistent with the set value of the system, otherwise returning to the step S5 to readjust the movable blade angle to reach the set value;
s7: after the movable blade angle reaches a set value, judging whether the negative pressure requirement of the hearth is met or not according to the comparison between the hearth negative pressure preset parameter and the actual hearth negative pressure parameter;
if the negative pressure requirement of the hearth is met, fixing the variable frequency speed and the movable blade angle;
and if the negative pressure requirement of the hearth is not met, returning to the step S2 to readjust the operating frequency of the high-voltage high-power variable-frequency speed regulation device.
2. The method of claim 1, further comprising a frequency conversion fault power frequency switching control method, wherein after the high-voltage high-power frequency conversion speed regulation device fails, before the high-voltage high-power frequency conversion speed regulation device completes power frequency switching, the DCS rapidly adjusts the angle of the movable blade fan to the angle range of the movable blade running at power frequency according to the fan characteristics and the actual value of the current air volume and air pressure, so as to meet the requirement of the air volume and air pressure after switching to the power frequency rotation speed, and the DCS blower control system enters the power frequency movable blade regulation mode after the synchronous switching to the power frequency running.
3. The method for coordinately controlling a variable-frequency movable blade of a movable blade adjustable fan according to claim 1, further comprising a method for controlling a frequency converter to normally switch power frequency: after a variable-cutting instruction is manually given, before the frequency converter automatically finishes variable-cutting switching, the DCS movable blade draught fan control system enters a variable-cutting automatic tracking mode, after the variable-cutting automatic tracking mode enters the mode, the DCS gradually increases the variable-frequency operating speed to the power-frequency operating speed, after the variable-frequency speed rises by 5%, the negative pressure of the hearth is automatically adjusted and stabilized through the movable blades, and after the variable-frequency operating fan speed is adjusted to the power-frequency operating speed and the negative pressure of the hearth is stable and meets requirements, the variable-cutting instruction is sent to the frequency converter.
4. The method of claim 1, further comprising a power frequency switching and frequency conversion control method, wherein an operator cuts an instruction, the frequency converter automatically performs power frequency switching and frequency conversion operation, after the switching operation is completed, the frequency of the frequency converter is maintained at 100%, the DCS movable blade fan control system enters a frequency conversion automatic tracking mode, the frequency conversion operation speed is adjusted according to the air volume requirement, the movable blade is automatically adjusted to stabilize the negative pressure of the furnace after the frequency conversion speed decreases by 5% of a rated value, and the DCS movable blade induced draft fan control system enters the frequency conversion movable blade coordination control logic after the speed and the angle of the movable blade enter the frequency conversion movable blade coordination control interval.
5. The method for coordinately controlling a variable-frequency movable blade for a movable blade adjustable fan according to claim 1, wherein when RB appears in a furnace and the frequency of the frequency converter needs to be adjusted rapidly, the DCS movable blade fan control system exits from a normal variable-frequency adjustment mode, keeps the angle of the movable blade unchanged, and rapidly adjusts the frequency of the frequency converter to reach a state required by the operation of a unit; after the state of the machine set is stable, the adjusting mode can be manually switched back to the variable frequency adjusting mode.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011310892.7A CN112228381A (en) | 2020-11-20 | 2020-11-20 | Variable-frequency movable vane coordination control method for movable vane adjustable fan |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011310892.7A CN112228381A (en) | 2020-11-20 | 2020-11-20 | Variable-frequency movable vane coordination control method for movable vane adjustable fan |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113007123A (en) * | 2021-03-08 | 2021-06-22 | 国家能源集团国源电力有限公司 | Control method and device of induced draft fan, electronic equipment and storage medium |
| CN113530871A (en) * | 2021-08-10 | 2021-10-22 | 西安热工研究院有限公司 | Power frequency dynamic switching method for frequency converter fault state of axial flow fan of power station |
| CN113566231A (en) * | 2021-09-06 | 2021-10-29 | 南京钢铁股份有限公司 | Energy-saving control method for combustion fan of heating furnace |
| CN116816716A (en) * | 2023-08-30 | 2023-09-29 | 苏州汇川控制技术有限公司 | Fan system control method, frequency converter, fan system and storage medium |
-
2020
- 2020-11-20 CN CN202011310892.7A patent/CN112228381A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113007123A (en) * | 2021-03-08 | 2021-06-22 | 国家能源集团国源电力有限公司 | Control method and device of induced draft fan, electronic equipment and storage medium |
| CN113007123B (en) * | 2021-03-08 | 2022-12-30 | 国家能源集团国源电力有限公司 | Control method and device of induced draft fan, electronic equipment and storage medium |
| CN113530871A (en) * | 2021-08-10 | 2021-10-22 | 西安热工研究院有限公司 | Power frequency dynamic switching method for frequency converter fault state of axial flow fan of power station |
| CN113566231A (en) * | 2021-09-06 | 2021-10-29 | 南京钢铁股份有限公司 | Energy-saving control method for combustion fan of heating furnace |
| CN116816716A (en) * | 2023-08-30 | 2023-09-29 | 苏州汇川控制技术有限公司 | Fan system control method, frequency converter, fan system and storage medium |
| CN116816716B (en) * | 2023-08-30 | 2023-11-21 | 苏州汇川控制技术有限公司 | Fan system control method, frequency converter, fan system and storage medium |
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