CN112628711A - Auxiliary engine fault stable combustion control method based on 600MW supercritical unit low load - Google Patents
Auxiliary engine fault stable combustion control method based on 600MW supercritical unit low load Download PDFInfo
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- CN112628711A CN112628711A CN202110032749.4A CN202110032749A CN112628711A CN 112628711 A CN112628711 A CN 112628711A CN 202110032749 A CN202110032749 A CN 202110032749A CN 112628711 A CN112628711 A CN 112628711A
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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
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
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Abstract
The invention relates to a control method for auxiliary engine fault stable combustion under the condition of low load of a 600MW supercritical unit, which comprises the following steps: step 1, judging whether the auxiliary machine fails or not based on the monitoring data of the running state of each auxiliary machine under low load; the auxiliary machine comprises a blower, an induced draft fan, a primary fan and a feed pump; the auxiliary machine faults comprise equipment tripping and equipment failure; and 2, for the condition that the current auxiliary machine has a fault, the auxiliary machine fault stable combustion under the low load of the unit is realized through interlocking action according to different auxiliary machine faults. According to the method, the auxiliary machine fault interlocking logic is designed based on the requirement of deep peak shaving of the unit, and the risk of shutdown caused by auxiliary machine fault under low load of the unit is reduced.
Description
Technical Field
The invention belongs to the technical field of thermal power generation, and particularly relates to a control method for auxiliary engine fault stable combustion under low load of a 600MW supercritical unit.
Background
Due to the rapid development of new energy power generation and the surplus of coal electricity production capacity in China, the flexible transformation of coal electricity is imperative. When the proportion of new energy in a power grid is gradually enlarged, the demand on a peak shaving power supply is gradually increased, and compared with power supplies such as new energy, the coal-electricity peak shaving performance is better. For countries using coal as the main primary energy source, highly regulated coal power plants are the most practical and feasible choices.
With the increase of the peak regulation requirement of the thermal power generating unit, the peak regulation depth is enhanced, and the peak regulation depth of many thermal power generating units generally reaches 30-50% (low load) of the rated load. Along with the enhancement of the peak shaving strength of the unit, the unit must operate in a low-load time period for a long time, and at the moment, if auxiliary machines (a blower, an induced draft fan, a primary fan and a feed pump) have faults, the auxiliary machines can only be intervened in time by operating personnel, and the shutdown risk is difficult to occur in time.
In the control strategy, when the unit is in a normal operation load, namely more than 50%, an auxiliary machine fault load reduction strategy (RB) ensures that the auxiliary machine is in a fault, the unit is subjected to load shedding and stable combustion, and the input precondition of the RB function is more than 50% of load. However, when the load of the unit is 30% to 50%, the RB strategy is not suitable for the current load, which results in a vacuum section of the auxiliary machine fault protection strategy, so that a control strategy for auxiliary machine fault stable combustion under low load needs to be made for the 30% to 50% load section of the unit, so as to make up for the lack of the relevant control strategy after the auxiliary machine fault in this load section.
Disclosure of Invention
The invention aims to provide a control method for auxiliary machine fault stable combustion under the low load of a 600MW supercritical unit, which judges that the current auxiliary machine has a fault by accurately judging the tripping operation or the failure of equipment of each auxiliary machine (a blower, an induced draft fan, a primary fan and a feed pump) under the low load of the unit, and simultaneously interlocks the subsequent relevant logics of actions so as to achieve the purposes of maintaining the current load of the unit and maintaining stable combustion.
The invention provides a control method for auxiliary engine fault stable combustion under the condition of low load of a 600MW supercritical unit, which comprises the following steps:
step 1, judging whether the auxiliary machine fails or not based on the monitoring data of the running state of each auxiliary machine under low load; the auxiliary machine comprises a blower, an induced draft fan, a primary fan and a feed pump; the auxiliary machine faults comprise equipment tripping and equipment failure;
and 2, for the condition that the current auxiliary machine has a fault, the auxiliary machine fault stable combustion under the low load of the unit is realized through interlocking action according to different auxiliary machine faults.
Further, the method for judging the equipment trip fault in the step 1 comprises the following steps:
three signals of current, operation non-selection and stop are adopted to judge the tripping faults of the air feeder, the induced draft fan and the primary air fan, and the state of a safety oil switch is adopted to judge the faults of the water feeding pump.
Further, the method for judging the failure of the device without applying power in step 1 includes:
judging whether the air feeder and the primary fan do not output power or not according to the current and the fan outlet pressure; judging whether the induced draft fan does not apply power or not according to the current and the pressure at the inlet of the induced draft fan; and judging whether the water feeding pump does not output power or not according to the rotating speed, the pressure difference value of the outlet pressure and the pressure of the water feeding mother pipe, the state of the outlet electric door and the inlet flow.
Further, the step 2 linkage action includes:
the load meets 30% -50% of the rated load, and the unit is in a CCS or TF mode:
one blower trips or one blower does not exert force:
CCS cuts to TF;
the boiler master control is switched manually;
the fuel master control is switched to manual operation;
the coal feeder is manually switched;
shielding and cutting manual conditions;
the blower loses power and trips the blower of the table;
connecting and tripping the induced draft fans on the same side, and overlapping the instructions of tripping the movable blades of the induced draft fans to the running induced draft fans;
simultaneously putting the plasma into the plasma of the running mill group;
one induced draft fan trips or does not exert power:
CCS cuts to TF;
the boiler master control is switched manually;
the fuel master control is switched to manual operation;
the coal feeder is manually switched;
shielding and cutting manual conditions;
the induced draft fan loses power and trips the induced draft fan;
connecting and tripping the induced draft fans on the same side, and overlapping the instructions of tripping the movable blades of the induced draft fans to the running induced draft fans;
simultaneously putting the plasma into the plasma of the running mill group;
one primary air fan trips or does not exert power:
CCS cuts to TF;
the boiler master control is switched manually;
the fuel master control is switched to manual operation;
the coal feeder is manually switched;
shielding and cutting manual conditions;
jumping the upper layer grinding set in a priority order, and keeping 3 grinding sets to operate;
closing an outlet inserting plate door of the off-line grinding unit, and adjusting a cold air door and a hot air door;
simultaneously putting the plasma into the plasma of the running mill group;
the primary fan loses power and trips the primary fan at the side;
the tripping fan instruction is superposed to the running fan;
one trip or one no-force of the feed pump is as follows:
CCS cuts to TF;
the boiler master control is switched manually;
the fuel master control is switched to manual operation;
the coal feeder is manually switched;
shielding and cutting manual conditions;
starting an electric pump in an interlocking manner;
tripping triggers the function, the rotating speed of the tripped water feeding pump is superposed to the running water feeding pump, and the rotating speed does not exceed 5600 rpm at most;
the function is triggered by the fact that the water feeding pump does not exert force, 30% of the rotating speed instruction of the water feeding pump which does not exert force is overridden and superposed, and the rotating speed does not exceed 5600 rpm at most;
manual reset, and automatic reset after 6min delay after triggering.
By means of the scheme, the auxiliary machine fault interlocking logic is designed based on the requirement of deep peak shaving of the unit through the control method based on auxiliary machine fault stable combustion under the low load of the 600MW supercritical unit, and the risk of shutdown caused by auxiliary machine fault under the low load of the unit is reduced.
The foregoing is a summary of the present invention, and in order to provide a clear understanding of the technical means of the present invention and to be implemented in accordance with the present specification, the following is a detailed description of the preferred embodiments of the present invention.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a control system constructed by applying the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The embodiment provides a control method for auxiliary engine fault stable combustion based on a 600MW supercritical unit under low load, which comprises the following steps:
step 1, judging whether the auxiliary machine fails or not based on the monitoring data of the running state of each auxiliary machine under low load; the auxiliary machine comprises a blower, an induced draft fan, a primary fan and a feed pump; the auxiliary machine faults comprise equipment tripping and equipment failure;
and 2, for the condition that the current auxiliary machine has a fault, the auxiliary machine fault stable combustion under the low load of the unit is realized through interlocking action according to different auxiliary machine faults.
Based on a control method for auxiliary machine fault stable combustion under the low load of a 600MW supercritical unit, based on the requirement of deep peak shaving of the unit, auxiliary machine fault interlocking logic is designed, and the risk of shutdown caused by auxiliary machine fault under the low load of the unit is reduced.
In this embodiment, the method for determining the trip fault of the device in step 1 includes:
three signals of current, operation non-selection and stop are adopted to judge the tripping faults of the air feeder, the induced draft fan and the primary air fan, and the state of a safety oil switch is adopted to judge the faults of the water feeding pump.
In this embodiment, the method for determining the failure of the device without applying power in step 1 includes:
judging whether the air feeder and the primary fan do not output power or not according to the current and the fan outlet pressure; judging whether the induced draft fan does not apply power or not according to the current and the pressure at the inlet of the induced draft fan; and judging whether the water feeding pump does not output power or not according to the rotating speed, the pressure difference value of the outlet pressure and the pressure of the water feeding mother pipe, the state of the outlet electric door and the inlet flow.
The present invention is described in further detail below.
According to the method, the faults of the current auxiliary machines are judged through accurately judging the tripping operation or the failure of the equipment of all the auxiliary machines (a blower, an induced draft fan, a primary fan and a feed pump) under the low load of the unit, and meanwhile, the follow-up related logics of the interlocking action are carried out, so that the purposes of maintaining the current load of the unit and maintaining stable combustion are achieved.
Referring to fig. 1, the control method for auxiliary engine fault stable combustion under low load specifically includes:
1. operating conditions
The allowable conditions are as follows: this function button is engaged and the unit is in coordination (CCS) or machine following (TF) mode.
Triggering conditions are as follows:
(1) the actual load is 200-395 MW, and any one of the two running air blowers stops running or loses output;
(2) the actual load is 200-395 MW, any one of the two running induced draft fans stops running or any one of the two running induced draft fans loses output;
(3) the actual load is 200-395 MW, any one of the two running primary fans stops running or any one loses output;
(4) the actual load is 200-395 MW, and any one of the two running steam pumps stops running or loses output.
This function and the RB function are locked to each other, and the other is locked within 30min after either action.
2. Action content
Public action content
(1) When the function acts, the CCS mode is switched to the TF mode, the boiler main control is switched to manual mode, the fuel main control is switched to manual mode, and the coal feeder is switched to manual mode;
(2) when the function acts, the air supply, the guide, the primary air fan and the water supply (the set value and the actual value, the instruction and the feedback of the actuating mechanism and the overregulated quantity) are switched to manual logic shielding;
(3) after the function is operated, if heat supply steam extraction exists, manual intervention is carried out by operating personnel.
Air feeder failure:
(1) tripping the air feeder when the air feeder loses output and meets the function triggering condition;
(2) connecting and tripping the induced draft fans on the same side, and overlapping the instructions of tripping the movable blades of the induced draft fans to the running induced draft fans;
(3) and simultaneously putting the plasma into the plasma corresponding to the running mill group.
The induced draft fan has a fault:
(1) the induced draft fan trips the induced draft fan when the induced draft fan loses power and meets the triggering condition of the function;
(2) connecting the tripping same-side air feeder, and overlapping a tripping fan moving blade instruction to the running fan;
(3) and simultaneously putting the plasma into the plasma corresponding to the running mill group.
Failure of the feed pump:
(1) starting an electric pump in an interlocking manner;
(2) the water feeding pump caused by tripping triggers the function, the rotating speed of the tripped water feeding pump is superposed to the running water feeding pump, and the rotating speed does not exceed 5600 rpm at most;
(3) the function is triggered by the water feeding pump caused by no output of the water feeding pump, 30% of the rotating speed instruction of the water feeding pump without output is overlapped in an overriding mode, and the rotating speed does not exceed 5600 rpm at most.
Primary air blower LRB:
(1) jumping the upper layer grinding group in a priority order, and keeping 3 grinding groups to operate (keeping the original state if less than 3 grinding groups);
(2) closing an outlet inserting plate door, a cold and hot air inserting plate door and a cold and hot air adjusting door of the off-line grinding unit;
(3) simultaneously putting the plasma into the plasma of the running mill group;
(4) tripping the primary fan on the side when the primary fan loses output and meets the function triggering condition;
(5) and (4) overlapping the moving blade instruction of the tripping fan to the running fan.
Function resetting:
(1) manual reset;
(2) and after triggering, resetting after delaying 6 min.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (4)
1. A control method for auxiliary engine fault stable combustion based on 600MW supercritical unit low load is characterized by comprising the following steps:
step 1, judging whether the auxiliary machine fails or not based on the monitoring data of the running state of each auxiliary machine under low load; the auxiliary machine comprises a blower, an induced draft fan, a primary fan and a feed pump; the auxiliary machine faults comprise equipment tripping and equipment failure;
and 2, for the condition that the current auxiliary machine has a fault, the auxiliary machine fault stable combustion under the low load of the unit is realized through interlocking action according to different auxiliary machine faults.
2. The control method for auxiliary engine fault stable combustion under the low load of the 600MW supercritical unit according to claim 1, wherein the method for judging the trip fault of the equipment in step 1 comprises:
three signals of current, operation non-selection and stop are adopted to judge the tripping faults of the air feeder, the induced draft fan and the primary air fan, and the state of a safety oil switch is adopted to judge the faults of the water feeding pump.
3. The control method for auxiliary engine fault stable combustion under the low load of the 600MW supercritical unit according to claim 2, wherein the method for judging the failure of the device in step 1 comprises:
judging whether the air feeder and the primary fan do not output power or not according to the current and the fan outlet pressure; judging whether the induced draft fan does not apply power or not according to the current and the pressure at the inlet of the induced draft fan; and judging whether the water feeding pump does not output power or not according to the rotating speed, the pressure difference value of the outlet pressure and the pressure of the water feeding mother pipe, the state of the outlet electric door and the inlet flow.
4. The control method for auxiliary engine fault stable combustion under the condition of low load of the 600MW supercritical unit according to claim 1, wherein the linkage action in the step 2 comprises:
the load meets 30% -50% of the rated load, and the unit is in a CCS or TF mode:
one blower trips or one blower does not exert force:
CCS cuts to TF;
the boiler master control is switched manually;
the fuel master control is switched to manual operation;
the coal feeder is manually switched;
shielding and cutting manual conditions;
the blower loses power and trips the blower of the table;
connecting and tripping the induced draft fans on the same side, and overlapping the instructions of tripping the movable blades of the induced draft fans to the running induced draft fans;
simultaneously putting the plasma into the plasma of the running mill group;
one induced draft fan trips or does not exert power:
CCS cuts to TF;
the boiler master control is switched manually;
the fuel master control is switched to manual operation;
the coal feeder is manually switched;
shielding and cutting manual conditions;
the induced draft fan loses power and trips the induced draft fan;
connecting and tripping the induced draft fans on the same side, and overlapping the instructions of tripping the movable blades of the induced draft fans to the running induced draft fans;
simultaneously putting the plasma into the plasma of the running mill group;
one primary air fan trips or does not exert power:
CCS cuts to TF;
the boiler master control is switched manually;
the fuel master control is switched to manual operation;
the coal feeder is manually switched;
shielding and cutting manual conditions;
jumping the upper layer grinding set in a priority order, and keeping 3 grinding sets to operate;
closing an outlet inserting plate door of the off-line grinding unit, and adjusting a cold air door and a hot air door;
simultaneously putting the plasma into the plasma of the running mill group;
the primary fan loses power and trips the primary fan at the side;
the tripping fan instruction is superposed to the running fan;
one trip or one no-force of the feed pump is as follows:
CCS cuts to TF;
the boiler master control is switched manually;
the fuel master control is switched to manual operation;
the coal feeder is manually switched;
shielding and cutting manual conditions;
starting an electric pump in an interlocking manner;
tripping triggers the function, the rotating speed of the tripped water feeding pump is superposed to the running water feeding pump, and the rotating speed does not exceed 5600 rpm at most;
the function is triggered by the fact that the water feeding pump does not exert force, 30% of the rotating speed instruction of the water feeding pump which does not exert force is overridden and superposed, and the rotating speed does not exceed 5600 rpm at most;
manual reset, and automatic reset after 6min delay after triggering.
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Cited By (5)
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| CN113898970A (en) * | 2021-11-02 | 2022-01-07 | 华能洛阳热电有限责任公司 | Method and device for processing primary fan fault of single-series auxiliary coal-fired unit without shutdown |
| CN114110551A (en) * | 2021-11-19 | 2022-03-01 | 新奥数能科技有限公司 | Method and device for detecting operation state of boiler auxiliary machine, electronic equipment and storage medium |
| CN114321872A (en) * | 2022-01-07 | 2022-04-12 | 神华神东电力有限责任公司 | Boiler protection method and boiler protection device |
| CN115576199A (en) * | 2022-09-29 | 2023-01-06 | 山东能源内蒙古盛鲁电力有限公司 | Low-load safety automatic control method for auxiliary engine under deep peak shaving of thermal power generating unit |
| CN116845887A (en) * | 2023-09-01 | 2023-10-03 | 华北电力科学研究院有限责任公司 | Fault processing method and device for single-side auxiliary machine configuration unit |
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| CN115576199A (en) * | 2022-09-29 | 2023-01-06 | 山东能源内蒙古盛鲁电力有限公司 | Low-load safety automatic control method for auxiliary engine under deep peak shaving of thermal power generating unit |
| CN115576199B (en) * | 2022-09-29 | 2024-03-08 | 山东能源内蒙古盛鲁电力有限公司 | Low-load safety automatic control method for auxiliary machinery under deep peak shaving of thermal power generating unit |
| CN116845887A (en) * | 2023-09-01 | 2023-10-03 | 华北电力科学研究院有限责任公司 | Fault processing method and device for single-side auxiliary machine configuration unit |
| CN116845887B (en) * | 2023-09-01 | 2023-11-10 | 华北电力科学研究院有限责任公司 | Fault processing method and device for single-side auxiliary machine configuration unit |
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Application publication date: 20210409 |