CN112833418A - Method for preventing fan operation signal from being mistakenly operated to trigger boiler main fuel to trip - Google Patents
Method for preventing fan operation signal from being mistakenly operated to trigger boiler main fuel to trip Download PDFInfo
- Publication number
- CN112833418A CN112833418A CN202011637966.8A CN202011637966A CN112833418A CN 112833418 A CN112833418 A CN 112833418A CN 202011637966 A CN202011637966 A CN 202011637966A CN 112833418 A CN112833418 A CN 112833418A
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- China
- Prior art keywords
- induced draft
- boiler
- draft fan
- fan
- control system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M11/00—Safety arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
Abstract
The invention relates to a method for preventing a fan operation signal from being mistakenly operated to trigger the tripping of a main fuel of a boiler, which is characterized in that a boiler system is provided with a first air feeder and a second air feeder which feed air to the boiler, and a computer control system judges three conditions for the tripping of an induced draft fan: 1. the current of the induced draft fan breaker is less than 5A; 2. the running state of the frequency converter of the induced draft fan disappears; 3. the circuit breaker closing position signal disappears; and when the computer control system judges that the fan is tripped, the computer control system immediately sends tripping instructions to all circuit breakers and frequency converters of the induced draft fan. The invention does not increase equipment, only modifies the logic of computer software, saves investment, and is economical and practical. The method is also suitable for occasions where operation signals of water pumps, frequency conversion equipment and the like are frequently mistakenly operated, and has a wide application range.
Description
The technical field is as follows:
the invention relates to a method for preventing a fan operation signal from being mistakenly operated to trigger the tripping of a main fuel of a boiler.
Background art:
in recent years, with the higher and higher requirements of energy conservation in China, the high-voltage frequency conversion technology of the fan is widely applied to thermal power generation projects. The high-voltage frequency conversion has the advantages of high reaction speed, large energy-saving space, high adjustment precision, basically no maintenance and the like, and is widely popularized and used. The circulating fluidized bed boiler air smoke system mainly comprises an induced draft fan, a first air feeder, a second air feeder and the like, and in order to prevent the overpressure of a hearth, the boiler is provided with large interlocking protection and main fuel tripping protection, and the two kinds of protection are realized by taking the running state of the air feeder to participate in logic. The most ideal situation is: and once the fan in the running state stops running, other fans are stopped immediately. If such an ideal operation mode is to be realized, it is necessary that other fans in operation can be automatically stopped in a chain manner immediately after the operating fan is tripped due to a fault. However, in a lot of fields, false operation of fan operation signals can occur, which causes boiler protection false operation, affects heat supply and power generation production, and causes economic loss. The reason is that: under the general condition, a fan operation signal is sent by an intermediate relay contact or a high-voltage circuit breaker auxiliary contact in a frequency converter and is sent to a computer control system, signal interruption is caused due to equipment vibration, loose wiring, dust, poor contact of relay contacts and the like, so that protection action is started, a boiler is tripped, delay is increased on part of sites, a plurality of contacts of the same relay are connected in parallel, and the effect is poor. Therefore, an optimized, safe and reliable method for preventing the fan operation signal from being mistakenly triggered to trigger the boiler main fuel trip is needed to be provided for the circulating fluidized bed boiler fan operation site to solve the problem and improve the production efficiency.
The invention content is as follows:
the invention aims to provide a method for preventing a fan operation signal from being mistakenly operated to trigger the tripping of a boiler main fuel, which can improve the operation reliability of a fan and improve the heat supply and power generation economy, thereby greatly improving the operation production efficiency. The technical scheme of the invention is as follows: a method for preventing fan operation signal from malfunction triggering boiler main fuel trip, setting a boiler system having a first blower and a second blower to supply air to the boiler, an induced draft fan to supply boiler flue gas to a chimney until the flue gas is exhausted to atmosphere, when the induced draft fan trips, triggering boiler main fuel protection trip, and all fans stop operation; when the computer control system monitors and judges that the induced draft fan trips, the computer control system can send the following control instructions and act corresponding equipment: firstly, the computer control system judges three conditions of tripping of the induced draft fan: 1. the current of the induced draft fan breaker is less than 5A; 2. the running state of the frequency converter of the induced draft fan disappears; 3. the circuit breaker closing position signal disappears; and when the computer control system judges that the fan is tripped, the computer control system immediately sends tripping instructions to all circuit breakers and frequency converters of the induced draft fan.
The working principle of the invention is as follows:
in the boiler system, a first air blower, a second air blower and an induced draft fan are in an operating state. When the computer control system judges that the induced draft fan meets any two of the following conditions: 1. the current of the induced draft fan breaker is less than 5A; 2. the running state of the frequency converter of the induced draft fan disappears; 3. the circuit breaker closing position signal disappears; and if the blower is judged to be tripped, the computer control system can send the following control instructions and act all the blowers to trip: the normal condition of the tripping of the fan is that the current is reduced to 0, the operation signal of the frequency converter of the induced draft fan disappears, the closing position of the breaker of the induced draft fan disappears, and the tripping of the fan can be judged as long as two items are met. Even if the intermediate relay signal of the frequency converter flickers and disappears, the tripping of the fan cannot be judged, and the misoperation of boiler main fuel protection is prevented; in field practice, two conditions never malfunction at the same time.
The current of the circuit breaker of the induced draft fan is smaller than the value, and the current can be set according to the actual size of the motor.
The invention has the technical effects that:
the invention provides a method for preventing a fan operation signal from being mistakenly operated to trigger the main fuel protection tripping of a boiler for the first time in the field of boiler operation protection logic, and changes the situation that a computer only singly selects a fan operation relay contact in the prior art, but increases the current of a circuit breaker and the switching-on position of the circuit breaker to participate in protection, 2 conditions are met in three strips at the same time, the protection can be reliably operated, the misoperation of boiler main fuel protection and boiler shutdown are avoided, and the boiler operation production efficiency is greatly improved. Meanwhile, the current of the circuit breaker and the closing position of the circuit breaker are uploaded to a computer and are only used for monitoring and alarming by the computer. The method is also suitable for occasions where operation signals of water pumps, frequency conversion equipment and the like are frequently mistakenly operated, and has a wide application range.
Drawings
FIG. 1 is a flow diagram of a boiler flue gas system.
Fig. 2 is a block diagram of fan trip determination.
Detailed Description
As shown in figure 1, in the production operation of the boiler, the induced draft fan is in operation by the first air feeder and the second secondary air blower of the boiler, when the induced draft fan trips, the inner part of the hearth is in a positive pressure state, and if the boiler is not stopped in time, the boiler is damaged. Therefore, all the draught fans need to be shut down as long as the induced draft fan is judged to be in fault and trip.
As shown in fig. 2, a method for preventing a fan operation signal from being mistakenly operated to trigger the tripping of a main fuel of a boiler is provided, wherein a boiler system is provided with a first air blower and a second air blower for supplying air to the boiler, an induced draft fan sends boiler flue gas to a chimney until the flue gas is exhausted to the atmosphere, when the induced draft fan trips, the main fuel of the boiler is triggered to trip, and all the fans are stopped; when the computer control system monitors and judges that the induced draft fan trips, the computer control system can send the following control instructions and act corresponding equipment: firstly, the computer control system judges three conditions of tripping of the induced draft fan: 1. the current of the induced draft fan breaker is less than 5A; 2. the running state of the frequency converter of the induced draft fan disappears; 3. the circuit breaker closing position signal disappears; and when the computer control system judges that the fan is tripped, the computer control system immediately sends tripping instructions to all circuit breakers and frequency converters of the induced draft fan.
Claims (1)
1. A method for preventing a fan operation signal from being mistakenly operated to trigger the main fuel of a boiler to trip is characterized by comprising the following steps of: setting a boiler system to have a first air feeder and a second air feeder to feed air to a boiler, sending boiler flue gas to a chimney by an induced draft fan until the flue gas is exhausted to the atmosphere, triggering the main fuel protection trip of the boiler when the induced draft fan trips, and stopping all the fans; when the computer control system monitors and judges that the induced draft fan trips, the computer control system can send the following control instructions and act corresponding equipment: firstly, the computer control system judges three conditions of tripping of the induced draft fan: 1. the current of the induced draft fan breaker is less than 5A; 2. the running state of the frequency converter of the induced draft fan disappears; 3. the circuit breaker closing position signal disappears; and when the computer control system judges that the fan is tripped, the computer control system immediately sends tripping instructions to all circuit breakers and frequency converters of the induced draft fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011637966.8A CN112833418A (en) | 2020-12-31 | 2020-12-31 | Method for preventing fan operation signal from being mistakenly operated to trigger boiler main fuel to trip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011637966.8A CN112833418A (en) | 2020-12-31 | 2020-12-31 | Method for preventing fan operation signal from being mistakenly operated to trigger boiler main fuel to trip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112833418A true CN112833418A (en) | 2021-05-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011637966.8A Pending CN112833418A (en) | 2020-12-31 | 2020-12-31 | Method for preventing fan operation signal from being mistakenly operated to trigger boiler main fuel to trip |
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| CN (1) | CN112833418A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114110647A (en) * | 2021-11-29 | 2022-03-01 | 西安热工研究院有限公司 | System and method for improving MFT protection reliability of thermal power generating unit boiler |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101725997A (en) * | 2009-12-15 | 2010-06-09 | 攀枝花新钢钒股份有限公司 | Hearth safety monitoring method |
| CN102324725A (en) * | 2011-04-29 | 2012-01-18 | 智胜化工股份有限公司 | Failure security protection method of three wastes fluidization mixing combustion furnace and device |
| CN103574578A (en) * | 2013-10-25 | 2014-02-12 | 广东电网公司电力科学研究院 | Anti-implosion control method for boiler furnace and smoke system in 1045 MW thermal power generating unit by adopting three-in-one induced draft fan |
| CN104141965A (en) * | 2014-07-15 | 2014-11-12 | 国家电网公司 | Desulfurization unit boiler flue implosion-proof optimal control system and method |
| CN108873832A (en) * | 2018-06-07 | 2018-11-23 | 大唐韩城第二发电有限责任公司 | A kind of flogic system and device of generator failure intertripping stator cooling water pump |
-
2020
- 2020-12-31 CN CN202011637966.8A patent/CN112833418A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101725997A (en) * | 2009-12-15 | 2010-06-09 | 攀枝花新钢钒股份有限公司 | Hearth safety monitoring method |
| CN102324725A (en) * | 2011-04-29 | 2012-01-18 | 智胜化工股份有限公司 | Failure security protection method of three wastes fluidization mixing combustion furnace and device |
| CN103574578A (en) * | 2013-10-25 | 2014-02-12 | 广东电网公司电力科学研究院 | Anti-implosion control method for boiler furnace and smoke system in 1045 MW thermal power generating unit by adopting three-in-one induced draft fan |
| CN104141965A (en) * | 2014-07-15 | 2014-11-12 | 国家电网公司 | Desulfurization unit boiler flue implosion-proof optimal control system and method |
| CN108873832A (en) * | 2018-06-07 | 2018-11-23 | 大唐韩城第二发电有限责任公司 | A kind of flogic system and device of generator failure intertripping stator cooling water pump |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114110647A (en) * | 2021-11-29 | 2022-03-01 | 西安热工研究院有限公司 | System and method for improving MFT protection reliability of thermal power generating unit boiler |
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| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210525 |
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| RJ01 | Rejection of invention patent application after publication |