CN112503564A - Fire detection discrete sampling system and control method - Google Patents
Fire detection discrete sampling system and control method Download PDFInfo
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- CN112503564A CN112503564A CN202011447468.7A CN202011447468A CN112503564A CN 112503564 A CN112503564 A CN 112503564A CN 202011447468 A CN202011447468 A CN 202011447468A CN 112503564 A CN112503564 A CN 112503564A
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- fire detection
- fire
- boiler
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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
- F23M11/04—Means for supervising combustion, e.g. windows
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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
- F23M11/04—Means for supervising combustion, e.g. windows
- F23M11/045—Means for supervising combustion, e.g. windows by observing the flame
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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
Abstract
The invention discloses a boiler fire detection discrete sampling system and a control method, and belongs to the field of flame monitoring. The fire detection device comprises a fire detection probe and a fire observation hole communicated with the fire detection probe, wherein the fire observation hole is provided with a compressed air inlet for instruments, and the fire observation hole is provided with an intermittent isolation element for intermittently isolating a hearth from the fire detection probe; the intermittent isolation element or the actuating mechanism thereof is connected with a boiler DCS control system. The invention can avoid setting a fire detection cooling fan, greatly reduce the consumption of compressed air, reduce the amount of cold air entering the hearth, improve the operation efficiency of the boiler and simultaneously not weaken the operation safety of the boiler.
Description
Technical Field
The invention relates to the field of flame detection, in particular to a fire detection discrete sampling system and a control method.
Background
The flame detection system is the most important component of the boiler combustion protection system, and the fire detection cooling air system provides cooling air for fire detection probes of a coal burner and an oil burner of a boiler, so that the fire detection probes are prevented from being damaged by high-temperature flue gas, and the flame combustion condition is normally monitored.
The existing boiler fire detection system comprises a fire detection probe and a fire observation hole connected with the fire detection probe, the fire observation hole is communicated with the fire detection probe all the time, and cooling air is uninterrupted. At present, a large-scale power station generally adopts a fire detection cooling fan or cold primary air as fire detection cooling air. The fire detection cooling air inlet is generally arranged near the combustor, and a large amount of cold air enters the combustor, so that the combustion condition is deteriorated, and the boiler efficiency is reduced.
In addition, when the primary air fan runs in a single row, the cold primary air is brought with powder due to the fact that the outlet baffle of the side air fan is not tight, or the hot air is recycled, the cold primary air is utilized to cool the fire detection, the ash accumulation of the fire detection probe can be caused, and further the boiler MFT is caused to act, and huge economic loss is caused.
How to reduce the influence of a large amount of fire detection cooling air entering on combustion conditions, reduce heat loss, reduce the ash deposition of a fire detection probe possibly caused by cold primary air cooling fire detection and the like is a problem to be solved urgently.
Disclosure of Invention
The invention provides a boiler fire detection discrete sampling system and a control method thereof, aiming at making up the defects of the prior art and solving the problems that the boiler efficiency is reduced due to heat loss caused by the condition that a fire detection cooling air direct blowing combustor deteriorates combustion in the prior art.
The technical scheme of the invention is as follows:
a boiler fire detection discrete sampling system comprises a fire detection probe and a fire observation hole communicated with the fire detection probe, wherein the fire observation hole is provided with an instrument compressed air inlet, and the fire observation hole is provided with an intermittent isolation element for intermittently isolating a hearth from the fire detection probe; the intermittent isolation element or the actuating mechanism thereof is connected with a boiler DCS control system.
The intermittent isolation element intermittently isolates the communication between the hearth and the fire detection probe, when the intermittent isolation element is not isolated, the fire detection probe works, meanwhile, compressed air flows out to cool the fire detection probe, and the fire detection probe is in a detection state, and each fire detection of each layer of combustor is designed to be in the detection state in sequence; this design can needn't set up the fire and examine cooling blower, and greatly reduces the compressed air quantity, reduces simultaneously and gets into furnace ground cold wind volume, has improved boiler operating efficiency, does not weaken the boiler security of operation simultaneously.
In one embodiment, the intermittent isolation element is a solenoid valve. When the electromagnetic valve is in an open state (namely, the intermittent isolating element is not isolated), the fire detection probe works, and meanwhile, the instrument uses compressed air to flow out to cool the fire detection probe, and the fire detection probe is in a detection state.
In one embodiment, the electromagnetic valve is connected with a boiler DCS control system.
As another embodiment, the intermittent isolation element is a rotary baffle disc provided with a through hole; the diameter of the rotary blocking disc is larger than that of the fire observation hole, and the part, located outside the fire observation hole, of the rotary blocking disc is sealed by the sealing cover. The rotary blocking disc rotates according to design requirements, when the through hole on the rotary blocking disc is overlapped with the fire observation hole (namely, the intermittent isolating element is not isolated), the fire detection probe works, meanwhile, compressed air flows out for cooling the fire detection probe, and the fire detection probe is in a detection state.
In one embodiment, the rotation actuator of the rotary catch disk is a servo motor.
In one embodiment, the servo motor is connected with a boiler DCS control system.
The fire detection discrete sampling control method of the system,
1) when the fire detection probe detects fire, delaying for 1-3 s, after receiving an 'off' signal, the intermittent isolation element isolates the hearth from the fire detection probe, and delaying for 7-12 s;
2) the duration time of an off signal of the intermittent isolation element is 6-11 s, fire detection is carried out during the isolation period, no fire exists, and the fire detection signal delays the presence of fire; when the intermittent isolation element stops isolating, the intermittent isolation element receives an 'on' signal, and the hearth is communicated with the fire detection probe;
the off signal duration of the intermittent isolation element is less than the fire detection signal delay time;
3) after the hearth is communicated with the fire detection probe,
a) when the fire detection probe detects fire, repeating the step 1) and the step 2);
b) when the fire detection is detected to be free of fire and the fire detection signal is delayed to be free of fire, the flame loss is reported.
In one embodiment, the duration of the off signal of the intermittent isolation element is 1-2 s shorter than the delay time of the fire detection signal.
In the step 1), when the fire detection probe detects fire, delaying for 1s, and after receiving an 'off' signal, the intermittent isolation element isolates the hearth from the fire detection probe, and the fire detection signal is delayed for 6-9 s.
In one embodiment, in the step 2), the off signal of the intermittent isolation element lasts for 5-8 s.
The invention has the beneficial effects that:
1. and a large amount of fire detection cooling air is prevented from entering a hearth, and the boiler efficiency is obviously improved.
2. The fire detection is effectively protected, and the cooling air with powder is prevented from blocking the fire detection probe.
3. And the power consumption of the plant is reduced.
4. Simple structure and convenient maintenance.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a boiler fire detection discrete sampling system according to the present invention;
FIG. 2 is another schematic structural diagram of the discrete sampling system for boiler fire detection according to the present invention;
fig. 3 is a side view of the baffle carousel of fig. 2.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing and simplifying the description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
Example 1
As shown in figure 1, the boiler fire detection discrete sampling system comprises a fire detection probe 1 and a fire observation hole 2 communicated with the fire detection probe 1. In the embodiment, the fire detection probe adopts an external peeping type fire detection; the fire observation hole 2 is two sections of straight pipes, and the two sections of straight pipes of the fire observation hole 2 are connected into a whole through the electromagnetic valve 4. The side of the fire observation hole 2 is provided with a compressed air inlet 3 for instruments. The electromagnetic valve 4 is connected with a boiler DCS control system.
In the embodiment, the electromagnetic valve 4 is used as an intermittent isolation element, and when the electromagnetic valve 4 is opened, the hearth is communicated with the fire detection probe 1; when the electromagnetic valve 4 is closed, the hearth is isolated from the fire detection probe 1. The intermittent isolation element is connected with a boiler DCS control system.
Embodiment 2 a fire detection discrete sampling control method of a boiler fire detection discrete sampling system according to embodiment 1 includes the steps of:
1) when the fire detection probe 1 detects fire, delaying for 1s, the electromagnetic valve 4 obtains an 'off' signal (the hearth is isolated from the fire detection probe 1 by the electromagnetic valve 4), and delaying for 9 s;
2) the closing signal of the electromagnetic valve 4 lasts for 8s, when the closing signal is finished, the fire detection is carried out without fire and the fire detection signal is delayed with fire, and the electromagnetic valve obtains an opening signal (the hearth is communicated with the fire detection probe);
3) after the electromagnetic valve is opened, namely after the hearth is communicated with the fire detection probe,
a) when the fire detection probe detects fire, repeating the step 1) and the step 2);
b) when the fire detection is detected to be free of fire and the fire detection signal is delayed to be free of fire, the flame loss is reported. And if the flame loss quantity of the burner meets the MFT condition, the MFT of the boiler is operated.
Example 3
As shown in figure 2, the boiler fire detection discrete sampling system comprises a fire detection probe 1 and a fire observation hole 2 communicated with the fire detection probe 1. In this embodiment, the fire observation hole 2 is a straight pipe, and the side of the fire observation hole 2 is provided with an instrument compressed air inlet 3.
The opening on the fire observation hole 2 is provided with a rotary baffle disc 5, and the diameter of the rotary baffle disc 5 is larger than that of the fire observation hole 2. The portion of the rotary fender 5 located outside the fire observation hole 2 is sealed by a sealing cover 6. As shown in fig. 3, the edge of the rotary catch tray 5 is provided with a through hole 5-1. An actuating mechanism of the rotary blocking disc 5 is a servo motor 7, a motor shaft of the servo motor 7 penetrates through the sealing cover 6 to be connected with the rotary blocking disc 5, and the rotary blocking disc 5 is driven by the servo motor 7 to rotate.
The rotary baffle disc 5 with the through hole 5-1 is used as an intermittent isolation element, and when the through hole 5-1 is overlapped with the area of the fire observation hole 2, the hearth is communicated with the fire detection probe 1; when the other part of the rotary baffle disc 5 is overlapped with the fire observation hole 2, the hearth is isolated from the fire detection probe 1.
The rotary catch disk 5 with the through hole 5-1 in this embodiment serves as an intermittent isolation element, the actuator servo motor 7 of which is connected to the boiler DCS control system.
Embodiment 4 a fire detection discrete sampling control method of a boiler fire detection discrete sampling system according to embodiment 3 includes the steps of:
1) the rotary baffle disc 5 rotates at a constant speed, 8s of rotation is set, the initial position is that the through hole 5-1 is overlapped with the fire observation hole 2, namely, the hearth is communicated with the fire detection probe 1; when the fire detection probe detects fire, delaying for 1s, the servo motor 7 obtains an isolation signal (off signal), the rotary baffle disc 5 rotates at a constant speed to isolate the hearth from the fire detection probe 1, and the fire detection signal delays for 9 s;
2) the 'isolation' signal is continuous (the rotary blocking disc 5 always rotates at a constant speed according to a set speed), the fire detection is free from fire, the fire detection signal is kept when the fire is delayed until the servo motor 7 obtains a 'disconnected isolation' signal again, namely, the rotary blocking disc 5 continuously rotates at a constant speed until the through hole 5-1 is overlapped with the fire observation hole, the intermittent isolation element stops isolating, and the hearth is communicated with the fire detection probe 1;
3) after the hearth is communicated with the fire detection probe 1,
a) when the fire detection probe detects fire, repeating the step 1) and the step 2);
b) when the fire detection is detected to be free of fire and the fire detection signal is delayed to be free of fire, the flame loss is reported. And if the flame loss quantity of the burner meets the MFT condition, the MFT of the boiler is operated.
Claims (10)
1. The utility model provides a discrete sampling system is examined to boiler fire, includes fire detection probe (1) and sightseeing fire hole (2) of examining probe (1) intercommunication with the fire, its characterized in that: a compressed air inlet (3) for instruments is arranged on the fire observation hole (2), and an intermittent isolation element for intermittently isolating the hearth from the fire detection probe is arranged on the fire observation hole (2); the intermittent isolation element or the actuating mechanism thereof is connected with a boiler DCS control system.
2. The discrete sampling system for boiler fire detection according to claim 1, wherein: the intermittent isolation element is an electromagnetic valve (4).
3. The discrete sampling system for boiler fire detection according to claim 2, wherein: and the electromagnetic valve (4) is connected with a boiler DCS control system.
4. The discrete sampling system for boiler fire detection according to claim 1, wherein: the intermittent isolation element is a rotary baffle disc (5) provided with a through hole (5-1); the diameter of the rotary blocking disc (5) is larger than that of the fire observation hole (2), and the part, located outside the fire observation hole (2), of the rotary blocking disc (5) is sealed by a sealing cover (6).
5. The discrete sampling system for boiler fire detection according to claim 4, wherein: and the rotation executing mechanism of the rotary catch disc (5) is a servo motor (7).
6. The discrete sampling system for boiler fire detection according to claim 5, wherein: and the servo motor (7) is connected with a boiler DCS control system.
7. The system fire detection discrete sampling control method of claim 1, characterized in that:
1) when the fire detection probe detects fire, delaying for 1-3 s, after receiving an 'off' signal, the intermittent isolation element isolates the hearth from the fire detection probe, and delaying for 7-12 s;
2) the duration time of an off signal of the intermittent isolation element is 6-11 s, fire detection is carried out during the isolation period, no fire exists, and the fire detection signal delays the presence of fire; when the intermittent isolation element stops isolating, the intermittent isolation element receives an 'on' signal, and the hearth is communicated with the fire detection probe;
the off signal duration of the intermittent isolation element is less than the fire detection signal delay time;
3) after the hearth is communicated with the fire detection probe,
a) when the fire detection probe detects fire, repeating the step 1) and the step 2);
b) when the fire detection is detected to be free of fire and the fire detection signal is delayed to be free of fire, the flame loss is reported.
8. The fire detection discrete sampling control method according to claim 7, characterized in that: the duration time of an off signal of the intermittent isolation element is 1-2 s shorter than the delay time of a fire detection signal.
9. The fire detection discrete sampling control method according to claim 7 or 8, characterized in that: in the step 1), when the fire detection probe detects fire, the time is delayed for 1s, the intermittent isolation element isolates the hearth from the fire detection probe after receiving an 'off' signal, and the time of the fire detection signal is delayed for 6-9 s.
10. The fire detection discrete sampling control method according to claim 9, characterized in that: in the step 2), the off signal of the intermittent isolation element lasts for 5-8 s.
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| CN202011447468.7A CN112503564A (en) | 2020-12-09 | 2020-12-09 | Fire detection discrete sampling system and control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113933384A (en) * | 2021-10-08 | 2022-01-14 | 哈尔滨工程大学 | Ultrasonic transducer auxiliary device suitable for opposite arrangement in severe environment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113933384A (en) * | 2021-10-08 | 2022-01-14 | 哈尔滨工程大学 | Ultrasonic transducer auxiliary device suitable for opposite arrangement in severe environment |
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