CN118293414A - Hearth pressure control method in variable frequency cutting power frequency process of induced draft fan of boiler of thermal power generating unit - Google Patents
Hearth pressure control method in variable frequency cutting power frequency process of induced draft fan of boiler of thermal power generating unit Download PDFInfo
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- CN118293414A CN118293414A CN202410538265.0A CN202410538265A CN118293414A CN 118293414 A CN118293414 A CN 118293414A CN 202410538265 A CN202410538265 A CN 202410538265A CN 118293414 A CN118293414 A CN 118293414A
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/42—Applications, arrangements or dispositions of alarm or automatic safety devices
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention provides a hearth pressure control method in the variable frequency cutting frequency process of a draught fan of a thermal power generating unit boiler, which comprises the following steps: when the frequency converter of the induced draft fan fails, judging whether to switch the frequency conversion failure induced draft fan to power frequency operation according to the frequency conversion instruction of the frequency converter of the induced draft fan before failure; if the variable-frequency fault induced draft fan is switched to the power frequency operation, the variable-frequency automatic control of the variable-frequency fault induced draft fan is released in the switching process, and the self-balancing module of the hearth negative pressure controller is locked; judging whether the switching of the variable-frequency fault induced draft fan to the power frequency is successful or not; if the variable frequency fault induced draft fan fails to switch to the power frequency, tripping the variable frequency fault induced draft fan, simultaneously tripping the same-side air blower, triggering the unit RB, and releasing the output lock of the self-balancing module of the hearth negative pressure controller; if the frequency conversion fault induced draft fan is switched to the power frequency successfully, the opening degree of the baffle plate of the power frequency operation induced draft fan is reduced by overriding. The control method can ensure the stable transition of the furnace pressure in the process of switching the variable frequency to the power frequency, and prevent the tripping operation of the boiler and the internal explosion of the furnace.
Description
Technical Field
The invention belongs to the field of thermal engineering automation control of thermal power units, and particularly relates to a hearth pressure control method in a variable frequency cutting power frequency process of a boiler induced draft fan of a thermal power unit.
Background
In the operation process of the thermal power generating unit, the operation working condition of the induced draft fan needs to be adjusted according to the change of the boiler load to ensure that the pressure of the hearth is stable. Common induced draft fan output adjustment modes include baffle throttling adjustment, variable frequency adjustment, movable blade angle adjustment and the like. The baffle is adjusted and is had the throttling loss, and fan operating efficiency is lower, and frequency conversion is adjusted, and it is higher to change movable vane angle adjustment efficiency. At present, the boiler induced draft fan of the thermoelectric unit is mostly adjusted by frequency conversion, the baffle plate is adjusted to be fully opened during normal operation, the throttling loss is reduced, and the operation is changed into baffle plate throttling adjustment when the frequency converter of the induced draft fan fails and operates at power frequency. The induced draft fan has higher efficiency when the combined regulation mode normally operates, and the induced draft fan output can still be ensured to have regulation means when the frequency converter fails and operates at the power frequency.
The frequency conversion control of the induced draft fan is PID closed loop control, and an adjusting instruction is calculated according to the deviation between the set value and the actual value of the hearth pressure, and the adjusting instruction is distributed to two induced draft fan frequency converters through a self-balancing module. When a frequency converter of one induced draft fan is in fault to be in power frequency operation, a frequency conversion instruction is cut into 0, the self-balancing module can superimpose the frequency conversion instruction of the fault induced draft fan on the frequency conversion instruction of the other induced draft fan, the output of the other induced draft fan is rapidly improved through override control, and the pressure fluctuation of a hearth is reduced. The regulation mode has a great hidden trouble in the frequency conversion process of frequency converter fault switching, firstly, if the frequency of the induced draft fan frequency converter is lower before fault, the frequency is switched into the power frequency instant full-output operation to be not matched with the boiler load, and the pressure of a hearth is easy to be out of control. And secondly, the fans do not exert force in the frequency switching process of the frequency converter of the induced draft fan, the other induced draft fan is overridden by a self-balancing loop to increase a frequency conversion instruction, when the frequency switching of the failed induced draft fan is completed, the operation is immediately changed from no force to the maximum force, the furnace pressure is suddenly reduced under the double action of the large force of the two fans, the furnace pressure is extremely easy to cause low boiler tripping, and even the furnace is implosion and equipment is damaged in serious cases. Based on the control method, the invention provides a hearth pressure control method for the frequency conversion cutting power frequency process of the induced draft fan of the thermal power generating unit boiler so as to solve the problems.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a hearth pressure control method in the variable frequency cutting power frequency process of a boiler induced draft fan of a thermal power unit, which can solve the problem of large hearth pressure fluctuation in the variable frequency cutting power frequency process of the boiler induced draft fan of the thermal power unit, maintain the hearth pressure relatively stable in the switching process, and avoid boiler tripping and hearth implosion.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the invention provides a hearth pressure control method in the variable frequency cutting frequency process of a draught fan of a thermal power generating unit boiler, which comprises the following steps:
step 1, when a frequency converter of an induced draft fan fails, judging whether to switch the frequency conversion failure induced draft fan to power frequency operation according to a frequency conversion instruction of the frequency converter of the induced draft fan before the failure; if the frequency conversion instruction is higher, switching the frequency conversion fault induced draft fan to power frequency operation, and if the frequency conversion instruction is lower, directly tripping the frequency conversion fault induced draft fan;
Step 2, if the variable frequency fault induced draft fan is switched to power frequency operation, the variable frequency automatic control of the variable frequency fault induced draft fan is released in the switching process, and the self-balancing module of the hearth negative pressure controller is locked through locking the variable frequency instruction output of the fault induced draft fan;
Step 3, judging whether the switching of the variable-frequency fault induced draft fan to the power frequency is successful or not;
Step 4, if the variable frequency fault induced draft fan fails to switch to the power frequency, tripping the variable frequency fault induced draft fan, simultaneously tripping the same-side forced draught fan, triggering a unit RB, releasing the output blocking of a self-balancing module of the hearth negative pressure controller, and overriding to increase the variable frequency instruction of the other induced draft fan;
And 5, if the variable frequency fault induced draft fan is successfully switched to the power frequency, overriding to reduce the opening degree of the baffle plate of the power frequency operation induced draft fan, wherein the action amplitude is from a broken line function generated by the boiler load.
Further, in the step 1, when the frequency converter of the induced draft fan fails, judging whether to convert the frequency-conversion failure induced draft fan into power frequency operation according to the frequency before the frequency converter of the induced draft fan fails; if the frequency of the induced draft fan is high before the fault, the boiler load is higher, the influence of the operation of converting the working frequency on the pressure of the hearth is smaller, the frequency conversion fault induced draft fan can be switched to the working frequency operation by delaying the frequency conversion cabinet working frequency bypass switch; if the frequency of the induced draft fan is low before failure and the boiler load is low, a single induced draft fan is enough to meet the boiler load requirement, the induced draft fan is converted into power frequency operation and operates with instant full output, the air supply and the induced draft are not matched and exceed the hearth bearing capacity, the low MFT protection action of the hearth pressure is easily caused, and therefore the tripping frequency conversion failure induced draft fan is needed.
Further, if the frequency of the induced draft fan before failure is more than 25Hz, the boiler load is high, the influence of the operation of converting the working frequency on the pressure of the hearth is small, and the time delay is 3s, the frequency converter cabinet is connected with a power frequency bypass switch, and the induced draft fan is operated at the working frequency; if the frequency of the induced draft fan before failure is less than 25Hz, the boiler load is low, the induced draft fan is converted into the instantaneous full-output operation of the power frequency operation, and the air supply and induced draft amount is not matched and exceeds the hearth bearing capacity, and the frequency conversion failure induced draft fan is tripped.
Further, the step 2 specifically includes: in the process of switching the variable frequency fault induced draft fan to the power frequency, the variable frequency instruction output of the locking variable frequency fault induced draft fan is performed, so that the self-balancing override loop of the locking induced draft fan allows the hearth pressure to rise to a certain extent, the hearth pressure drop amplitude after the power frequency switching of the variable frequency fault induced draft fan is completed is reduced, and the stable transition of the hearth pressure in the whole variable frequency power frequency switching process is ensured.
Further, in the step 3, the method for judging whether the frequency conversion cutting frequency of the variable frequency fault induced draft fan is successful comprises the following steps: if the incoming line switch of the induced draft fan is switched on after the frequency converter of the induced draft fan fails and the power frequency switch of the bypass cabinet of the frequency converter is switched on, judging that the frequency conversion and power frequency switching operation of the induced draft fan is successful, otherwise, judging that the frequency conversion and power frequency switching operation of the frequency conversion failure induced draft fan fails.
Further, the step 4 specifically includes: when the frequency conversion fault induced-draft fan frequency conversion is switched to the power frequency operation failure, the frequency conversion fault induced-draft fan inlet switch is tripped, meanwhile, the same-side air feeder is tripped in a combined mode, the load of the unit RB is triggered, the output blocking of a self-balancing module of the hearth negative pressure controller is relieved, at the moment, the frequency conversion instruction of the induced-draft fan which normally operates is increased through the override of a self-balancing loop, and after the override is finished, the pressure of the hearth is ensured to be stable at a set value through PID (proportion integration differentiation) automatic control.
Further, the step 5 specifically includes: when the frequency conversion fault induced draft fan is switched to power frequency successfully, the induced draft fan is quickly increased to full-output operation from no-output, the negative pressure of a furnace chamber is quickly reduced to large negative pressure from positive pressure, and the PID (proportion integration differentiation) regulation effect is relatively slow, so that the regulating baffle of the power frequency operation induced draft fan is required to be turned off in an overriding way, the pressure fluctuation of the furnace chamber is quickly reduced, and the amplitude of the overriding action is generated by a broken line function of the load of the boiler.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
The invention provides a control method for reducing hearth pressure fluctuation according to the frequency of a draught fan frequency converter during fault and whether frequency conversion cutting frequency is successful or not aiming at the problem of large hearth pressure fluctuation in the frequency conversion cutting frequency process of the draught fan of a thermal power unit boiler. If the frequency of the induced draft fan frequency converter is low during faults, the boiler load is low, the disturbance of the cut power frequency operation to the unit is too large, and the induced draft fan should be directly tripped. If the frequency is higher when the frequency converter of the induced draft fan fails, the operation can be switched to the power frequency operation, and the hearth pressure control self-balancing loop is blocked in the switching process. If the frequency conversion is failed to be switched to the power frequency, tripping the induced draft fan, simultaneously tripping the same-side forced draught fan, and recovering the self-balancing loop; if the frequency conversion is successfully switched to the power frequency, the power frequency operation induced draft fan adjusting baffle is turned off in an overriding way, so that the hearth pressure is prevented from dropping sharply. The control method can ensure the stable transition of the furnace pressure in the process of switching the variable frequency to the power frequency, and prevent the tripping operation of the boiler and the internal explosion of the furnace.
Drawings
FIG. 1 is a schematic diagram of the result of a subsequent action of a frequency converter failure of an induced draft fan;
FIG. 2 is a schematic diagram of a variable frequency regulation closed loop control of the induced draft fan;
fig. 3 is a schematic diagram of judging the frequency conversion fault-cut power frequency action result of the induced draft fan.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.
Example 1
The embodiment of the invention provides a hearth pressure control method in the variable frequency cutting power frequency process of a boiler induced draft fan of a thermal power unit, which comprises the following steps:
Step 1: when the frequency converter of the induced draft fan fails, judging whether to switch the frequency conversion failure induced draft fan to power frequency operation according to the frequency conversion instruction of the frequency converter of the induced draft fan before failure; if the frequency of the induced draft fan is high before the fault, the boiler load is higher, the influence of the operation of converting the working frequency on the pressure of the hearth is smaller, the frequency conversion fault induced draft fan can be switched to the working frequency operation by delaying the frequency conversion cabinet working frequency bypass switch; if the frequency of the induced draft fan is low before failure and the boiler load is low, a single induced draft fan is enough to meet the boiler load requirement, the induced draft fan is converted into power frequency operation and operates with instant full output, the air supply and the induced draft are not matched and exceed the hearth bearing capacity, the low MFT protection action of the hearth pressure is extremely easy to be caused, and therefore the direct tripping of the variable frequency failure induced draft fan is needed.
Specifically, whether the induced draft fan is converted into power frequency operation is judged according to the frequency before the frequency converter of the induced draft fan fails, if the frequency of the induced draft fan before the failure is more than 25Hz, the 3s of the frequency converter cabinet power frequency bypass switch can be delayed, and the induced draft fan is converted into the power frequency operation. If the frequency of the induced draft fan before the fault is less than 25Hz, the fault induced draft fan is directly tripped.
Step 2: when the frequency of the induced draft fan before failure is high, the variable frequency failure induced draft fan is switched to power frequency operation, the variable frequency control of the variable frequency failure induced draft fan is automatically released in the switching process, and the self-balancing module of the hearth negative pressure controller is locked through locking the variable frequency instruction output of the failure induced draft fan.
The frequency conversion fault induced draft fan is switched to power frequency operation, the frequency conversion control of the fan is automatically released in the switching process, and the self-balancing module of the hearth negative pressure controller is locked through the frequency conversion instruction output of the locking fault induced draft fan, specifically: the control method of the furnace pressure of the variable frequency induced draft fan is that PID closed loop output generates two induced draft fan frequency converter instructions through a self-balancing loop. The self-balancing control function is generated through the negative pressure PID output and the bias function of the hearth. A induced draft fan frequency conversion instruction adds bias for PID output, and B induced draft fan instruction subtracts bias for PID output. When two induced draft fans are automatic, the offset value is manually set by an operator; when one of the two fans is not automatic or neither fan is automatic, the offset value is automatically generated by logic, and the value is obtained by subtracting the variable frequency instruction of the induced draft fan A from the variable frequency instruction of the induced draft fan B and multiplying the variable frequency instruction by 0.5, so that the self-balancing control is realized.
If one induced draft fan frequency converter fails or stops, the induced draft fan frequency conversion control is automatically cut off, the frequency conversion instruction is cut off to 0, the frequency conversion instruction before failure is overlapped on the frequency conversion instruction of the other induced draft fan, the frequency conversion failure induced draft fan is quickly converted into the maximum output operation from the maximum output after the frequency conversion is successful, and the hearth pressure is rapidly reduced under the double functions of the two induced draft fans of high output. Therefore, the frequency conversion instruction output of the locking frequency conversion fault induced draft fan is needed in the frequency conversion fault induced draft fan-to-power frequency switching process, so that the self-balancing loop of the locking induced draft fan allows the hearth pressure to rise to a certain extent, the hearth pressure drop amplitude after the frequency conversion fault induced draft fan is subjected to power frequency switching is reduced, and the stable transition of the hearth pressure in the whole frequency conversion power frequency switching process is ensured.
Step 3: judging whether the switching of the variable-frequency fault induced draft fan to the power frequency is successful or not.
The method for judging whether the frequency conversion cutting frequency of the variable-frequency fault induced draft fan is successful or not comprises the following steps: if the incoming line switch of the induced draft fan is switched on after the induced draft fan frequency converter fails for 5 seconds and the bypass cabinet power frequency switch of the frequency converter is switched on, judging that the induced draft fan frequency conversion switching power frequency operation is successful, otherwise, judging that the frequency conversion fault induced draft fan frequency conversion switching power frequency fails.
Step 4: if the frequency conversion fault induced draft fan fails to switch to the power frequency, tripping the frequency conversion fault induced draft fan, simultaneously jointly tripping the same-side air blower, triggering the unit RB, releasing the output blocking of the self-balancing module of the hearth negative pressure controller, and overriding to increase the frequency conversion instruction of the other induced draft fan.
Specifically, when the frequency conversion fault induced-draft fan frequency conversion power frequency operation fails, tripping the frequency conversion fault induced-draft fan inlet wire switch, simultaneously jointly tripping the same-side air feeder, triggering the unit RB to reduce load, releasing the output locking of the self-balancing module of the hearth negative pressure controller, and at the moment, the frequency conversion instruction of the normally operated induced-draft fan is increased through the override of the self-balancing loop, and after the override is finished, the pressure of the hearth is ensured to be stable at a set value through PID automatic control.
Step 5: if the frequency conversion fault induced draft fan is switched to the power frequency successfully, the opening degree of a baffle plate of the power frequency operation induced draft fan is reduced by overriding, and the action amplitude is from a broken line function generated by the boiler load.
Specifically, when the frequency conversion fault induced draft fan is switched to power frequency by frequency conversion, the induced draft fan is quickly increased to full-output operation from no-output, the negative pressure of a furnace chamber is quickly reduced to large negative pressure from positive pressure, and the PID (proportion integration differentiation) regulation effect is relatively slow, so that the regulating baffle of the power frequency operation induced draft fan is required to be overridden and closed, the pressure fluctuation of the furnace chamber is quickly reduced, and the amplitude of the overriding action is generated by a broken line function of the load of the boiler.
The invention provides a control method for reducing hearth pressure fluctuation. If the frequency of the induced draft fan frequency converter is low during faults, the boiler load is low, the disturbance of the cut power frequency operation to the unit is too large, and the induced draft fan should be directly tripped. If the frequency is higher when the frequency converter of the induced draft fan fails, the operation can be switched to the power frequency operation, and the hearth pressure control self-balancing loop is blocked in the switching process. If the frequency conversion is failed to be switched to the power frequency, tripping the induced draft fan, simultaneously tripping the same-side forced draught fan, and recovering the self-balancing loop; if the frequency conversion is successfully switched to the power frequency, the power frequency operation induced draft fan adjusting baffle is turned off in an overriding way, so that the hearth pressure is prevented from dropping sharply. The control method can ensure the stable transition of the furnace pressure in the process of switching the variable frequency to the power frequency, and prevent the tripping operation of the boiler and the internal explosion of the furnace.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the present invention.
Claims (7)
1. A hearth pressure control method in the frequency conversion cutting frequency process of a boiler induced draft fan of a thermal power generating unit is characterized by comprising the following steps:
Step 1, when a frequency converter of an induced draft fan fails, judging whether to switch the frequency conversion failure induced draft fan to power frequency operation according to a frequency conversion instruction of the frequency converter of the induced draft fan before the failure;
Step2, if the variable-frequency fault induced draft fan is switched to power frequency operation, the variable-frequency automatic control of the variable-frequency fault induced draft fan is released in the switching process, and a self-balancing module of the hearth negative pressure controller is locked;
Step 3, judging whether the switching of the variable-frequency fault induced draft fan to the power frequency is successful or not;
Step 4, if the variable frequency fault induced draft fan fails to switch to the power frequency, tripping the variable frequency fault induced draft fan, simultaneously tripping the same-side forced draught fan, triggering the unit RB, and releasing the output lock of the self-balancing module of the hearth negative pressure controller;
and 5, if the variable frequency fault induced draft fan is switched to the power frequency successfully, overriding to reduce the opening degree of the baffle plate of the power frequency operation induced draft fan.
2. The method for controlling the hearth pressure in the variable frequency cutting power frequency process of the induced draft fan of the thermal power generating unit according to claim 1, wherein,
In the step 1, when the induced draft fan frequency converter fails, judging whether to convert the frequency conversion failure induced draft fan into power frequency operation according to the frequency before the induced draft fan frequency converter fails; if the frequency of the induced draft fan before the fault is high, switching the variable-frequency fault induced draft fan to power frequency operation; if the frequency of the induced draft fan before the fault is low, the frequency conversion fault induced draft fan is directly tripped.
3. The method for controlling the hearth pressure in the variable frequency cutting power frequency process of the induced draft fan of the thermal power generating unit according to claim 1, wherein,
The step 2 specifically comprises the following steps: in the process of switching the variable frequency fault induced draft fan to the power frequency, the variable frequency instruction output of the locking variable frequency fault induced draft fan is performed, so that the self-balancing override loop of the locking induced draft fan allows the hearth pressure to rise to a certain extent, the hearth pressure drop amplitude after the power frequency switching of the variable frequency fault induced draft fan is completed is reduced, and the stable transition of the hearth pressure in the whole variable frequency power frequency switching process is ensured.
4. The method for controlling the hearth pressure in the variable frequency cutting power frequency process of the induced draft fan of the thermal power generating unit according to claim 1, wherein,
In the step 3, the method for judging whether the frequency conversion cutting frequency of the variable-frequency fault induced draft fan is successful comprises the following steps:
if the incoming line switch of the induced draft fan is switched on after the frequency converter of the induced draft fan fails and the power frequency switch of the bypass cabinet of the frequency converter is switched on, judging that the frequency conversion and power frequency switching operation of the induced draft fan is successful, otherwise, judging that the frequency conversion and power frequency switching operation of the frequency conversion failure induced draft fan fails.
5. The method for controlling the hearth pressure in the variable frequency cutting power frequency process of the induced draft fan of the thermal power generating unit according to claim 1, wherein,
The step 4 specifically comprises the following steps: when the frequency conversion fault induced-draft fan frequency conversion is switched to the power frequency operation failure, the frequency conversion fault induced-draft fan inlet switch is tripped, meanwhile, the same-side air feeder is tripped in a combined mode, the load of the unit RB is triggered, the output blocking of a self-balancing module of the hearth negative pressure controller is relieved, the frequency conversion instruction of the normally operated induced-draft fan is increased through the override of a self-balancing loop, and the pressure of the hearth is ensured to be stable at a set value through the PID automatic control after the override is finished.
6. The method for controlling the hearth pressure in the variable frequency cutting power frequency process of the induced draft fan of the thermal power generating unit according to claim 1, wherein,
The step 5 specifically comprises the following steps: when the variable frequency fault induced draft fan is switched to power frequency successfully, the induced draft fan is rapidly increased to full-output operation from no-output, the negative pressure of a furnace chamber is rapidly reduced to large negative pressure from positive pressure, an adjusting baffle of the induced draft fan is closed by overriding, the pressure fluctuation of the furnace chamber is rapidly reduced, and the amplitude of overriding action is generated by a broken line function of the load of the boiler.
7. The method for controlling the hearth pressure in the variable frequency cutting power frequency process of the induced draft fan of the thermal power generating unit according to claim 2, wherein,
If the frequency of the induced draft fan before failure is more than 25Hz, the boiler load is high, the influence of the operation of converting the working frequency to the pressure of the hearth is small, and the time delay is 3s, the induced draft fan is switched to the working frequency for operation by switching the working frequency of the frequency converter cabinet;
If the frequency of the induced draft fan before failure is less than 25Hz, the boiler load is low, the induced draft fan is converted into the instantaneous full-output operation of the power frequency operation, and the air supply and induced draft amount is not matched and exceeds the hearth bearing capacity, and the frequency conversion failure induced draft fan is tripped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410538265.0A CN118293414A (en) | 2024-04-30 | 2024-04-30 | Hearth pressure control method in variable frequency cutting power frequency process of induced draft fan of boiler of thermal power generating unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410538265.0A CN118293414A (en) | 2024-04-30 | 2024-04-30 | Hearth pressure control method in variable frequency cutting power frequency process of induced draft fan of boiler of thermal power generating unit |
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| CN118293414A true CN118293414A (en) | 2024-07-05 |
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| CN202410538265.0A Pending CN118293414A (en) | 2024-04-30 | 2024-04-30 | Hearth pressure control method in variable frequency cutting power frequency process of induced draft fan of boiler of thermal power generating unit |
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