CN112963859A - Boiler critical flame protection misoperation prevention regulation and control system - Google Patents
Boiler critical flame protection misoperation prevention regulation and control system Download PDFInfo
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- CN112963859A CN112963859A CN202110269475.0A CN202110269475A CN112963859A CN 112963859 A CN112963859 A CN 112963859A CN 202110269475 A CN202110269475 A CN 202110269475A CN 112963859 A CN112963859 A CN 112963859A
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- flame
- coal mill
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
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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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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
The invention relates to the technical field of power plant boiler system protection, in particular to a boiler critical flame protection misoperation prevention regulation and control system. Which comprises the following steps: detecting and acquiring the number of flame signals of the main coal mill by a regulation and control system; the method comprises the steps that a regulation and control system obtains operation data of adjacent coal mills of a main coal mill; the control system analyzes the flame signal loss data of the main coal mill and analyzes the operation data of adjacent coal mills of the main coal mill in a combined manner; and the regulating and controlling system analyzes according to the S3 data, judges the flame combustion condition in the main coal mill, and sends out an execution operation or trip protection instruction according to the judged combustion condition. The gain effect of the invention is: the shielding protection is carried out before the flame of the coal mill loses the protection, so that the accuracy of judging the condition of the flame signal loss of the main coal mill is further improved, and the condition of protection misoperation caused by the temporary loss of the flame of a hearth caused by coke falling is favorably shielded. Thereby reducing unnecessary tripping risks and reducing the restarting cost.
Description
Technical Field
The invention relates to the technical field of power plant boiler system protection, in particular to a boiler critical flame protection misoperation prevention regulation and control system.
Background
The power generation of the thermal power plant mainly carries out coal combustion through a hearth system to convert heat energy into electric energy to be supplied to thousands of households for use. The flame conditions in a boiler and a coal mill need to be detected in real time in the combustion process of the existing hearth system, a plurality of combustion detection point positions are arranged in the boiler and the coal mill, the monitoring of flame signals in the hearth system is realized through the detection point positions, when all the flame signals of the hearth system are lost, the flame is triggered to lose protection, and a regulation and control system controls the combustion system to start tripping and fire extinguishing action protection according to the conditions.
However, the burning coke-dropping condition happens in the combustion process of the furnace system, at this time, the flame signal detected by the flame detection system is temporarily lost due to burning coke-dropping, but not actually lost, if the misoperation caused by the temporary loss of flame signal due to burning coke-dropping causes the regulation and control system to trigger flame to lose protection, trip the coal pulverizer, even cause the boiler to perform fire-extinguishing and other misoperation-preventing actions, which can cause great loss to the power plant, the boiler is tripped due to the fire-extinguishing protection of the whole furnace due to coke-dropping in many power plants at present, after the misoperation and the fire-extinguishing actions, the restarting process of the furnace system needs to consume a large amount of energy and time, and the result is not compensated.
In view of the above, a technical solution capable of effectively avoiding unnecessary loss due to short-time flame loss and improving the accuracy of boiler flame detection is needed to solve the above problem of false operation of the conventional flame detection protection system.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a boiler critical flame protection misoperation prevention regulation and control system which carries out comprehensive analysis according to the actual flame detection condition of a coal mill and the operation condition of an adjacent coal mill and realizes that flame loss protection caused by coke dropping is temporarily shielded when coke drops in a boiler hearth, so that actions such as protection misoperation, fire extinguishment and the like possibly caused by coke dropping are avoided.
In order to achieve the technical purpose, the technical scheme of the invention is as follows:
a boiler critical flame protection misoperation prevention regulation and control system comprises the following steps:
s1, detecting the number of the flame signals of the main coal mill by a regulation and control system;
s2, the control system acquires the operation data of the adjacent coal mills of the main coal mill;
s3, analyzing the flame signal loss data of the main coal mill by the regulating and controlling system, and analyzing the operation data of the adjacent coal mills of the main coal mill in a combined manner;
and S4, analyzing by the regulating and controlling system according to the data of S3, judging the flame combustion condition in the main coal mill, and sending an execution operation or trip protection instruction by the regulating and controlling system according to the judged combustion condition.
Preferably, when the number of flame signals lost in the step S3 is less than 4, the operation data analysis of the adjacent coal mills of the main coal mill is not performed, the flame protection is not triggered, and the control system sends a continuous operation instruction to the main coal mill.
Preferably, when the number of flame signal loss obtained in the step S3 is greater than or equal to 4 flame signals, the operation data analysis of the adjacent coal mills of the main coal mill is performed.
Preferably, step S3 is executed to obtain operation data of adjacent coal mills, and when the number of flame signal losses obtained in step S3 is greater than or equal to 4 flame signals, the adjacent coal mill is in an operating state, and the coal feeding amount of the coal feeder of the adjacent coal mill is above a preset safety value, the flame protection is triggered according to a preset delay rechecking time value.
Preferably, when the regulation and control system detects the recovery of the flame signal lost in the main coal mill within the preset delay rechecking time value, the flame protection is not triggered.
Preferably, the preset delay rechecking time value triggers the flame protection condition that when the regulation and control system does not detect the recovery of the flame signal lost in the main coal mill within the preset delay rechecking time value, a flame protection instruction is triggered to send.
Preferably, when the regulating and controlling system detects that the flame signal of the main coal mill is lost and is more than or equal to 4 flame signals and the coal feeding amount of the coal feeder of the adjacent coal mill is below a safety preset value, the flame protection is triggered, a flame protection instruction is sent, and the regulating and controlling system starts the protection misoperation-prevention action and executes a tripping protection instruction.
Preferably, when the regulating and controlling system detects that the flame signal of the main coal mill is lost and is more than or equal to 4 flame signals, and the adjacent coal mills are in a non-running state, the flame protection is triggered, a flame protection instruction is sent, and the regulating and controlling system starts a protection misoperation-preventing action and executes a tripping protection instruction.
Preferably, the coal feeding amount is 40t/h at a safety preset value, and the preset time delay reinspection time value is 10 s.
Preferably, the judgment of the adjacent coal mill is as follows: the upper coal mill, the middle coal mill and the opposite side coal mill are adjacent coal mills, the middle coal mill, the upper coal mill and the lower coal mill are adjacent coal mills, and the lower coal mill, the middle coal mill and the opposite side coal mill are adjacent coal mills.
Compared with the prior art, the gain effect of the invention is as follows: according to the invention, a shielding protection is carried out before the flame of the coal mill is out of protection, namely, the flame protection action is triggered after the flame detection is carried out for 4 times, the operation condition judgment of an adjacent coal mill is added, and the accuracy of the judgment of the flame signal loss condition of the main coal mill is further improved by detecting whether the operation and coal feeding quantity values of the adjacent coal mill meet preset parameters or not. Thereby reducing unnecessary tripping risks and reducing the restarting cost.
Drawings
FIG. 1 is a logic diagram for protecting against false operation according to the present invention.
FIG. 2 is a boiler system of the present invention.
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
To further clarify the objects, features and functions of the present invention, a review board will be provided by referring to the following description of the preferred embodiments in conjunction with the accompanying drawings:
referring to fig. 1-2, the present invention is a boiler critical flame protection misoperation prevention control system, comprising the following steps:
s1, detecting the number of the flame signals of the main coal mill by a regulation and control system;
s2, the control system acquires the operation data of the adjacent coal mills of the main coal mill;
s3, analyzing the flame signal loss data of the main coal mill by the regulating and controlling system, and analyzing the operation data of the adjacent coal mills of the main coal mill in a combined manner;
and S4, analyzing by the regulating and controlling system according to the data of S3, judging the flame combustion condition in the main coal mill, and sending an execution operation or trip protection instruction by the regulating and controlling system according to the judged combustion condition.
Preferably, when the number of flame signals lost in the step S3 is less than 4, the operation data analysis of the adjacent coal mills of the main coal mill is not performed, the flame protection is not triggered, and the control system sends a continuous operation instruction to the main coal mill.
Preferably, when the number of flame signal loss obtained in the step S3 is greater than or equal to 4 flame signals, the operation data analysis of the adjacent coal mills of the main coal mill is performed.
Preferably, in step S3, the operation data of adjacent coal mills is obtained, and when the number of flame signal losses in step S3 is greater than or equal to 4 flame signals, and the adjacent coal mill is in an operating state and the coal feeding amount of the coal feeder of the adjacent coal mill is greater than or equal to a preset safety value, it is determined that the flame in the furnace is sufficient under a short-time condition, and the flame protection is triggered according to the preset time delay and recheck time value control.
Preferably, when the regulation and control system detects the recovery of the flame signal lost in the main coal mill within the preset delay rechecking time value, the flame protection is not triggered.
Preferably, the preset delay rechecking time value triggers the flame protection condition that when the regulation and control system does not detect the recovery of the flame signal lost in the main coal mill within the preset delay rechecking time value, a flame protection instruction is triggered to send.
Preferably, when the regulating and controlling system detects that the flame signal of the main coal mill is lost and is more than or equal to 4 flame signals and the coal feeding amount of the coal feeder of the adjacent coal mill is below a safety preset value, the flame protection is triggered, a flame protection instruction is sent, and the regulating and controlling system starts the protection misoperation-prevention action and executes a tripping protection instruction.
Preferably, when the regulating and controlling system detects that the flame signal of the main coal mill is lost and is more than or equal to 4 flame signals, and the adjacent coal mills are in a non-running state, the flame protection is triggered, a flame protection instruction is sent, and the regulating and controlling system starts a protection misoperation-preventing action and executes a tripping protection instruction.
Preferably, the coal feeding amount is 40t/h at a safety preset value, and the preset time delay reinspection time value is 10 s.
Preferably, the judgment of the adjacent coal mill is as follows: the upper coal mill, the middle coal mill and the opposite side coal mill are adjacent coal mills, the middle coal mill, the upper coal mill and the lower coal mill are adjacent coal mills, and the lower coal mill, the middle coal mill and the opposite side coal mill are adjacent coal mills.
The specific protection misoperation-prevention working principle is as follows:
the control system acquires the flame signals of the monitored main coal mills, analyzes the number of the flame signals lost of the main coal mills, and judges whether the flame is out of protection or not by combining the number of the flame signals lost of the main coal mills and the operation data of the adjacent coal mills of the main coal mills.
When the number of the flame signals lost of the main coal mill acquired by the regulation and control system is less than 4, the operation data analysis of the adjacent coal mills of the main coal mill is not carried out, the flame loss protection is not triggered, and the regulation and control system sends a continuous operation instruction to the main coal mill.
And when the number of flame signals lost by the main coal mill acquired by the regulation and control system is more than or equal to 4 flame signals, starting the flame loss protection shielding action, and analyzing the operation data of the adjacent coal mills of the main coal mill.
Analyzing operational data of adjacent coal mills of the main coal mill:
when the adjacent coal mills are in an operating state and the coal feeding amount of the coal feeders of the adjacent coal mills is above a safety preset value (such as the coal feeding amount of 40 t/h), the condition that the flame in the furnace is enough under the condition of short time is judged, and the lost flame signal in the main coal mill can be recovered within a preset delay rechecking time value (such as 10s), the flame is not triggered to lose protection, and the risk of false tripping of the coal mills is reduced; when the adjacent coal mills are in an operating state and the coal feeding amount of the coal feeders of the adjacent coal mills is above a safety preset value (such as the coal feeding amount of 40 t/h), but the flame signal lost in the main coal mill cannot be recovered and detected within a preset delay rechecking time value (such as 10s), the delay triggers the transmission of a flame loss protection instruction.
When the regulating and controlling system detects that the flame signal loss of the main coal mill is more than or equal to 4 flame signals and the coal feeding amount of the coal feeder of the adjacent coal mill is below a safety preset value (such as the coal feeding amount of 40 t/h), triggering the flame to lose protection, sending a flame loss protection instruction, starting a protection misoperation-preventing action by the regulating and controlling system, and directly executing a tripping protection instruction; or when the regulating and controlling system detects that the flame signal of the main coal mill is lost and is more than or equal to 4 flame signals, and the adjacent coal mills are in a non-running state, the flame is triggered to lose protection, a flame loss protection instruction is sent, the regulating and controlling system starts protection misoperation-preventing action, the tripping protection instruction is directly executed, and untimely action during real fire extinguishing is avoided.
As shown in fig. 2, the judgment of the adjacent coal mill is: the upper coal mill (C coal mill/D coal mill) and the middle coal mill (B coal mill/E coal mill), the opposite side coal mill (D coal mill/C coal mill) are adjacent coal mills, the middle coal mill (B coal mill/E coal mill) and the upper coal mill (C coal mill/D coal mill), the lower coal mill (A coal mill/F coal mill) is adjacent coal mill, the lower coal mill (A coal mill/F coal mill) and the middle coal mill (B coal mill/E coal mill), the opposite side coal mill (F coal mill/A coal mill) is adjacent coal mill.
The regulation and control system is a DCS control system.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A boiler critical flame protection misoperation prevention regulation and control system is characterized by comprising the following steps:
s1, detecting and acquiring a flame signal of the main coal mill by a regulation and control system;
s2, the control system acquires the operation data of the adjacent coal mills of the main coal mill;
s3, analyzing the flame signal loss data of the main coal mill by the regulating and controlling system, and analyzing the operation data of the adjacent coal mills of the main coal mill in a combined manner;
and S4, analyzing by the regulating and controlling system according to the data of S3, judging the flame combustion condition in the main coal mill, and sending an execution operation or trip protection instruction by the regulating and controlling system according to the judged combustion condition.
2. The boiler critical flame protection malfunction prevention regulation and control system of claim 1, wherein when the number of flame signal loss obtained in the step S3 is less than 4 flame signals, the operation data analysis of the adjacent coal mills of the main coal mill is not performed, the flame protection is not triggered, and the regulation and control system sends a continuous operation instruction to the main coal mill.
3. The boiler critical flame protection anti-malfunction regulating and controlling system of claim 1, wherein when the number of flame signal loss obtained in the step S3 is greater than or equal to 4 flame signals, the operation data analysis of the adjacent coal mills of the main coal mill is performed.
4. The boiler critical flame protection malfunction-prevention regulation and control system of claim 3, wherein step S3 is implemented by executing operation data of adjacent coal mills, and when the number of lost flame signals obtained in step S3 is greater than or equal to 4 flame signals, the adjacent coal mills are in an operating state, and the coal feeding amount of the coal feeders of the adjacent coal mills is above a safe preset value, the flame protection is controlled and triggered according to a preset delay rechecking time value.
5. The boiler critical flame protection malfunction prevention regulation and control system of claim 4, wherein flame protection is not triggered when the regulation and control system detects the recovery of the flame signal lost in the main coal mill within a preset delay recheck time value.
6. The boiler critical flame protection malfunction prevention regulation and control system of claim 4, wherein the preset delay recheck time value triggers the flame protection condition that when the regulation and control system does not detect the recovery of the flame signal lost in the main coal mill within the preset delay recheck time value, the flame protection command is triggered to be sent.
7. The boiler critical flame protection malfunction prevention regulation and control system of claim 4, wherein when the regulation and control system detects that the flame signal of the main coal mill is lost and is equal to or more than 4 flame signals, and the coal feeding amount of the coal feeder of the adjacent coal mill is below a safety preset value, the flame protection is triggered, a flame protection instruction is sent, and the regulation and control system starts protection malfunction prevention action to execute a trip protection instruction.
8. The boiler critical flame protection malfunction prevention regulation and control system of claim 4, wherein when the regulation and control system detects that the flame signal of the main coal mill is lost and is equal to or greater than 4 flame signals, and the adjacent coal mill is in a non-operating state, the flame protection is triggered, a flame protection command is sent, and the regulation and control system starts a protection malfunction prevention action to execute a trip protection command.
9. The boiler critical flame protection anti-misoperation regulation and control system according to any one of claims 4-7, wherein the coal feeding amount is 40t/h at a safety preset value, and the preset delay rechecking time value is 10 s.
10. The boiler critical flame protection anti-malfunction regulating and controlling system according to any one of claims 1 to 8, wherein the judgment of the adjacent coal mill is as follows: the upper coal mill, the middle coal mill and the opposite side coal mill are adjacent coal mills, the middle coal mill, the upper coal mill and the lower coal mill are adjacent coal mills, and the lower coal mill, the middle coal mill and the opposite side coal mill are adjacent coal mills.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110269475.0A CN112963859A (en) | 2021-03-12 | 2021-03-12 | Boiler critical flame protection misoperation prevention regulation and control system |
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| CN202110269475.0A CN112963859A (en) | 2021-03-12 | 2021-03-12 | Boiler critical flame protection misoperation prevention regulation and control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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