CN111536554A - Induced draft fan stall control method for preventing boiler MFT from being triggered - Google Patents
Induced draft fan stall control method for preventing boiler MFT from being triggered Download PDFInfo
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- CN111536554A CN111536554A CN202010438223.1A CN202010438223A CN111536554A CN 111536554 A CN111536554 A CN 111536554A CN 202010438223 A CN202010438223 A CN 202010438223A CN 111536554 A CN111536554 A CN 111536554A
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- induced draft
- draft fan
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
- F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
The invention discloses a control method for preventing a induced draft fan from stalling to trigger a boiler MFT, which comprises the following steps: firstly, when the following conditions are met, the induced draft fan is considered to be stalled: the current deviation of the induced draft fan 1A \1B is more than 40A; the 1A \1B induced draft fan is started to operate for more than 5 min; amplifying the load in the same proportion along with the increase of the load according to the rule that the load of a 300MW unit is more than 260MW and the load of a 600MW unit is more than 520 MW; secondly, protecting and acting after the induced draft fan stalls: when the induced draft fan is monitored to stall, a lower coal mill is automatically jumped off in an interlocking manner; the movable blade of the automatic interlocking blower is closed to 16% in an overriding way, the operation is maintained for 1min, and the operation personnel adjusts the movable blade after 1min according to the actual condition; the control mode of the automatic interlocking unit is switched from a coordination mode to a machine following mode for operation, the pressure given value is 13.5MPa, and the stable operation of the unit is guaranteed. The method can effectively avoid the occurrence of boiler MFT (Fuel injection frequency) events caused by the stalling of the induced draft fan.
Description
Technical Field
The invention relates to a control method for preventing a induced draft fan from stalling when a boiler MFT is triggered.
Background
The induced draft fan is the key auxiliary engine among the thermal power factory, and axial fan with adjustable movable vane that high efficiency and energy consumption are low is widely adopted at present, and in actual operation, the stall takes place for the induced draft fan frequently for power plant not a few because of the induced draft fan, robbes the wind accident, and operating personnel often discovers and handles untimely, will lead to boiler MFT to cause unplanned shut down even when serious, has influenced the generated energy of unit and the safe operation of equipment.
Disclosure of Invention
The invention provides a control method for preventing an induced draft fan from stalling, aiming at the problem that an operator cannot take action in time to trigger a boiler MFT after the induced draft fan stalls.
The purpose of the invention is realized by the following technical scheme:
a control method for preventing a induced draft fan from stalling when a boiler MFT is triggered comprises the following steps:
step one, automatically judging the stall of a unit induced draft fan:
the induced draft fan of the unit meets all the following conditions, and then the induced draft fan is considered to be stalled:
(1) the current deviation of the first induced draft fan and the second induced draft fan is larger than 40A;
(2) the first induced draft fan and the second induced draft fan are started to operate for more than 5 min;
(3) amplifying the load in the same proportion along with the increase of the load according to the rule that the load of a 300MW unit is more than 260MW and the load of a 600MW unit is more than 520 MW;
step two, protecting and acting after the induced draft fan of the unit stalls:
(1) when the induced draft fan is monitored to stall, a lower coal mill is automatically jumped off in an interlocking manner;
(2) the movable blade of the automatic interlocking blower is closed to 16% in an overriding way and is maintained for 1min to reduce the air supply quantity, and the operator adjusts the movable blade after 1min according to the actual condition;
(3) the control mode of the automatic interlocking unit is switched from a coordination mode to a machine following mode for operation, the pressure given value is 13.5MPa, and the stable operation of the unit is guaranteed.
Compared with the prior art, the invention has the following advantages:
the method can realize automatic processing in the process of the induced draft fan stalling accident, quickly and accurately make judgment and operation, and effectively avoid the occurrence of boiler MFT (Fuel injection frequency) events caused by the stalling of the induced draft fan.
Detailed Description
The technical solutions of the present invention are further described below, but not limited thereto, and modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
The invention provides a control method for preventing a induced draft fan from stalling to trigger a boiler MFT, which comprises the following steps:
step one, automatically judging the stall of an induced draft fan:
the induced draft fan of the unit meets all the following conditions, and then the induced draft fan is considered to be stalled:
(1) the current deviation of the first induced draft fan (1A) and the second induced draft fan (1B) is larger than 40A;
(2) 1A \1B is started to run for more than 5 min;
(3) the load of the 300MW unit is more than 260 MW; with the load scaling up, the load of the 600MW unit is larger than 520 MW.
The current rapidly drops after the induced draft fan stalls, and can be used as an effective basis for judging the stall, so that the condition that the current deviation of the induced draft fan 1A \1B is more than 40A is used as the judgment condition for the stall of the induced draft fan. In order to improve the current reliability of the induced draft fan, one measuring point is added to the current of the 1A \1B induced draft fan respectively, one measuring point is taken from two measuring points, the quality of each measuring point is judged, an alarm is sent out when the measuring point is abnormal, the measuring point is automatically cut off, and the misoperation of equipment can be effectively prevented.
In order to prevent the equipment misoperation caused by large current deviation of the draught fan 1A \1B when the draught fan is just started, the 1A \1B draught fan is logically operated after 5 min.
Generally, the stall of the induced draft fan is under high load, so that the condition that the unit load is greater than 260MW is determined to be used as another condition for judging the stall of the induced draft fan.
Step two, protecting and acting after the induced draft fan stalls:
(1) when the induced draft fan is monitored to stall, one lower coal mill is automatically tripped out in an interlocking mode, and the air-powder mixture entering the hearth is reduced for the first time in the mode, so that the pressure rise of the hearth is restrained. The unit of the inner Mongolia Jingke power generation Limited company adopts a 1A \1D coal mill to operate simultaneously, and preferentially trips the 1A coal mill.
(2) When the induced draft fan is monitored to stall, the movable blades of the automatic interlocking air feeder are closed to 16% in an overriding mode (according to experience values in the past accident handling process), the state is maintained for 1min, the air supply quantity is reduced, and after 1min, the operation personnel adjust the state according to actual conditions.
(3) When the induced draft fan is monitored to stall, the control mode of the automatic interlocking unit is switched from the coordination mode to the machine following mode to operate, the pressure set value is 13.5MPa (the pressure set value of the RB machine following mode is used later), and the stable operation of the unit is guaranteed.
A No. 1 unit of a Nemontage Jingke power generation Limited company generates a stall accident of an induced draft fan for many times since production, wherein after the induced draft fan stalls, a boiler MFT (Fuel off Process) is triggered, and the safe operation of the unit is seriously threatened. In the No. 1 unit of the inner Mongolia Jingke power generation company, after a draught fan stalls, the pressure of a hearth rises rapidly, the pressure of the hearth can reach a value of 2 (1750 Pa) within 15 seconds, and an MFT (Fuel boiler) is triggered; the stall from the induced draft fan to the boiler MFT is only 15 seconds, and after the stall of the induced draft fan, an operator cannot take action in time to avoid triggering the boiler MFT.
After the induced draft fan stall control method is adopted by a No. 1 unit of Nemontage Jingke power generation Limited company, 13 hours at 07 months and 13 days in 2019 for 16 minutes and 53 seconds, the load of the unit is 293MW, the induced draft fan stalls, the current is suddenly reduced to 159A from 224A, 16 minutes and 58 seconds at 13 hours, the unit is switched to the following mode to operate in a coordinated mode, the 1A coal mill trips in an interlocking mode, the movable blade of the 1A \1B air feeder is automatically closed to 16%, the pressure of a hearth is highest and 1208Pa, and the boiler MFT is not triggered.
Claims (1)
1. A control method for preventing an induced draft fan from stalling when a boiler MFT is triggered is characterized by comprising the following steps:
step one, automatically judging the stall of a unit induced draft fan:
the induced draft fan of the unit meets all the following conditions, and then the induced draft fan is considered to be stalled:
(1) the current deviation of the first induced draft fan and the second induced draft fan is larger than 40A;
(2) the first induced draft fan and the second induced draft fan are started to operate for more than 5 min;
(3) amplifying the load in the same proportion along with the increase of the load according to the rule that the load of a 300MW unit is more than 260MW and the load of a 600MW unit is more than 520 MW;
step 2, protecting and acting after a unit induced draft fan stalls:
(1) when the induced draft fan is monitored to stall, a lower coal mill is automatically jumped off in an interlocking manner;
(2) the movable blade of the automatic interlocking blower is closed to 16% in an overriding way, the operation is maintained for 1min, and the operation personnel adjusts the movable blade after 1min according to the actual condition;
(3) the control mode of the automatic interlocking unit is switched from a coordination mode to a machine following mode for operation, the pressure given value is 13.5MPa, and the stable operation of the unit is guaranteed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010438223.1A CN111536554B (en) | 2020-05-21 | 2020-05-21 | Induced draft fan stall control method for preventing boiler MFT from being triggered |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010438223.1A CN111536554B (en) | 2020-05-21 | 2020-05-21 | Induced draft fan stall control method for preventing boiler MFT from being triggered |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111536554A true CN111536554A (en) | 2020-08-14 |
| CN111536554B CN111536554B (en) | 2022-02-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010438223.1A Active CN111536554B (en) | 2020-05-21 | 2020-05-21 | Induced draft fan stall control method for preventing boiler MFT from being triggered |
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| CN111536554B (en) | 2022-02-08 |
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