CN2620189Y - Fire detector for single burner - Google Patents
Fire detector for single burner Download PDFInfo
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- CN2620189Y CN2620189Y CN 03213260 CN03213260U CN2620189Y CN 2620189 Y CN2620189 Y CN 2620189Y CN 03213260 CN03213260 CN 03213260 CN 03213260 U CN03213260 U CN 03213260U CN 2620189 Y CN2620189 Y CN 2620189Y
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- flame
- single burner
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Abstract
The utility model discloses a single-burner flame detection device, which aims at catching the signals characteristic spectrum after a photoelectric conversion of the single-burner flame being implemented in the optical radiation of burning area, and separating the single-burner flame from a background flame, the influence of background flame can be removed, and the combustion status of the flame of an object burner can be detected. The device comprises a lens group, a fire detecting probe which is formed by a photoelectric converter, and a signal processing unit taking MCU as the main body. The scope of spectrum analysis is ranged from 0 to 1000 Hz. The output DC 4 to 20 mA analog quantity and digital switching capacity can form a return circuit with DCS and FSSS. The utility model can be widely applicable for the furnace safety automated protection system of the gas, feul and coal-fired boiler in large-scale gas-fired power plant.
Description
Technical field
The utility model relates to a kind of boiler furnace safety detection device, more particularly, relates to a kind of pick-up unit of flame of single burner.
Background technology
Large-sized boiler all must have perfect supervision that prevents furnace explosion and control device, finish this function be " boiler furnace safety monitoring system " (FSSS), and the detection of boiler-burner flame is the important component part of this system, and whether its correct detection will directly influence the reliability of whole boiler Furnace Safeguard Supervisory System action.Up to now, domestic production mostly be simple photovoltaic type flame detector, though also be installed in by the burner, the flame of target combustion device can not be separated from background (full burner hearth) flame, from essence is that full furnace flame detects, and they can not really satisfy the FSSS system requirements.The boiler of evaporation capacity more than 670t/h all should adopt the single burner flame detector.Now, the flame detector of Chinese large-sized boiler is in the majority with imported product, because difference to the theoretical deciphering of flame combustion aspect existence, actual conditions for China's boiler combustion, in application, also has suitable limitation, this shows that mainly the debugging working condition requirement is harsh, step is loaded down with trivial details, does not often reach ideal effect.Can not satisfy the actual demand that single burner flame detects.The domestic in recent years people of having adopts camera production flame image, detect single burner flame by Computer Image Processing then, because computer image processing technology is still very unripe at present to the processing of flame image, this device also has with a certain distance from practical application.
Summary of the invention
The purpose of this utility model is the shortcoming that overcomes above-mentioned flame detector, a kind of high performance single burner flame detecting device is provided, it can distinguish the flame of target combustion device from whole furnace flame and very strong furnace wall radiation, (FSSS) be connected with " boiler furnace safety monitoring system ", make this system can really understand the combustion conditions of boiler, when detecting the fire extinguishing of burner hearth or single burner, fuel shutoff supply in time, the time that makes unignited fuel enter burner hearth shortens as far as possible, and then fundamentally prevents the generation of furnace puff accident.
Modern Theory of Combustion is thought: fuel can be divided into preheating-drying in the boiler furnace internal combustion, catches fire, burning, after-flame four-stage.In this several stages, most important is exactly the stage of catching fire.Make fuel combustion complete, at first will realize rapid and stable catching fire, guarantee the good beginning of combustion process; Also have only and realized rapid and stable catching fire, burning and after-flame stage just may carry out, and the stability of burning and efficient could improve.Therefore the detected object of single burner flame should be catching fire the stage of flame.
Theory of Combustion and experimental result all show, the most important phase that acts as a fuel and burn---the stage of catching fire exists stronger light ray radiation flicker, the energy of AC portion is very big in the flame, and the luminous energy flicker of other stage of burning and full furnace flame is all very weak, the spectrum energy of AC portion distributes also has very big difference with the stage of catching fire, that is to say that the dynamic spectrum of single burner flame is different with full burner hearth or background flame.In fact, industrial flame is not transparent, and the dynamic spectrum of a certain burner flame almost can not pass the dynamic spectrum that industrial flame removes to influence other burner flame.
The utility model adopts the characteristic frequency spectrum analytical technology, catch the characteristic frequency spectrum of single burner flame at ignition zone optical radiation electric signal after opto-electronic conversion, single burner flame is separated from background flame, reject the influence of background flame, this device comprises a light inspection probe and the signal processing unit be made up of lens combination (1), photoelectric commutator (2), it is characterized in that the technical scheme of signal processing unit is summarized as follows:
Numerical characteristic frequency spectrum analyser (4) in the signal processing unit is provided with key (6) by parallel bus and A/D converter (3) and parameter and is connected; Be connected with D/A converter (5) with display (7) by universal serial bus; Numerical characteristic frequency spectrum analyser (4), by A/D converter (3) high speed acquisition time domain electric signal, portion is transformed into frequency-region signal with time-domain signal and handles within it, will compare, and the single burner flare up fire value that computing draws is divided three tunnel outputs:
1, delivers to display (7);
2, deliver to D/A converter (5), convert analog quantity to;
3, with threshold ratio, when being lower than, equaling threshold value and remaining to the regulation delay time, export a switching value.
In the technical program, quartz glass convex lens group (1) is arranged in the flame detecting probe, be contained in the shell (12), place the front end of flame detecting probe, flame light focuses on the photoelectric cell (15) through light pipe (13), convert voltage signal to, link to each other with circuit board (16) by lead, realize voltage---the conversion of electric current, its 4～20mA signal is delivered to signal processing unit through lead again, aviation socket (17) is adopted in outlet, to guarantee dustproof effect.Adopt fabricated section (14) and boiler furnace to join.Cooling is constantly blasted in the probe shell by mouth piece (18) with pressurized air, and probe is cooled off.The visual angle of flame detecting probe is 70 °.
The utility model can the fuel band difference, as combustion gas, fire coal, fuel oil adopt respectively ultraviolet light, visible light, infrared light light activated element any form photoelectric commutator.
The utility model is 0～1000HZ with the frequency domain scope of numerical characteristic frequency spectrum analyser (4).
This single burner flame detector device is not only applicable to the fuel-burning power plant, is applicable to the petroleum chemical enterprise of pyrolysis furnace yet; Be not only applicable to fine coal and make fuel, be applicable to the large-sized boiler of fuel oil, combustion gas yet.
From the result that reality is used, the pick-up unit of this single burner flame, low cost of manufacture, technical feature is stable, and the reliability height is a kind of of the optional instrument of boiler furnace security monitoring.
Description of drawings
Fig. 1 is the utility model principle calcspar
Fig. 2 is the utility model flame detecting probe structural representation
Fig. 3 is first embodiment circuit theory diagrams of the present utility model
Fig. 4 is second embodiment circuit theory diagrams of the present utility model
Fig. 5 is the 3rd embodiment circuit theory diagrams of the present utility model
Fig. 6 is the 4th an embodiment schematic block circuit diagram of the present utility model
Fig. 7 is the utility model running experiment result curve figure on coal-burning boiler
Fig. 8 is fuel oil running experiment result curve figure of the present utility model
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail:
Signal processor as shown in Figure 3, furnace flame 4～20mA signal converts voltage signal to through R1, delivers to the A/D input end AD0 of microprocessor after amplifying through operational amplifier U1 on the one hand; On the other hand by C1 isolated DC component, through receiving the A/D input end AD1 of microprocessor after the operational amplifier U2 amplification.Microprocessor MCU carries out computing according to the A/D result of alternating current-direct current, draws the characteristic frequency spectrum of single burner flame, judges having or not of single burner flame.Microprocessor has three kinds of way of outputs; 1. drive charactron by U4, show operation and fault-signal.2. drive relay by triode N1, output switching value signal.3. the flare up fire digital quantity of process computing converts the output of 4～20mA current signal to by operational amplifier U5 and current converter Z2 after D/A converts analog quantity to.
Microprocessor P2 mouth also is connected to four button S1-S4, operational factor is set uses.
Signal processor as shown in Figure 4, furnace flame 4～20mA signal converts voltage signal to through R1, delivers to the A/D input end AD0 of microprocessor after amplifying through operational amplifier U1 on the one hand; By C1 isolated DC component, amplify, behind bandpass filter U3 able to programme, two band signals delivered to again A/D input end AD1, the AD2 of microprocessor through operational amplifier U2 on the other hand.Microprocessor MCU carries out computing according to the A/D result of alternating current-direct current, judges having or not of single burner flame.Microprocessor has three kinds of way of outputs: 1. drive charactron by U4, show operation and failure message.2. drive relay by triode N1, output switching value signal.3. process computing flare up fire digital quantity converts the output of 4～20mA current signal to by operational amplifier U5 and current converter Z2 after D/A converts analog quantity to.
Microprocessor P2 mouth also is connected to four button S1-S4, operational factor is set uses.
Signal processor as shown in Figure 5, furnace flame 4～20mA signal converts voltage signal to through R1, receives A/D converter U3 input end IN after amplifying through operational amplifier U1 on the one hand; On the other hand by C1 isolated DC component, through receiving A/D converter U4 input end IN after the operational amplifier U2 amplification.The transformation result of A/D converter U3, U4 outputs to digital signal processor DSP.DSP carries out computing according to the A/D result of alternating current-direct current, draws the characteristic frequency spectrum of single burner flame, judges having or not of single burner flame.Digital signal processor has three kinds of way of outputs; 1. drive charactron by MAX7219, show operation and fault-signal.2. drive relay by triode N1, output switching value signal.3. the flare up fire digital quantity of process computing becomes the output of 4～20mA current signal after the U5 conversion.
With the computing machine be core the detection theory diagram as shown in Figure 6, add A/D capture card and on-off output card in computer-internal.The flame probe output signal is received A/D capture card input end, and computing machine reads the laggard row operation of A/D result, calculates single burner flame value in the characteristic frequency spectrum of single burner flame.Computing machine carries out screen display on the one hand, on the other hand this flame value and fire extinguishing judgment threshold is compared, if be lower than the fire extinguishing judgment threshold and kept the fire extinguishing delay time, then by digital output module output fire extinguishing switching value signal.Fire extinguishing judgment threshold and fire extinguishing delay time can pass through computer settings.
Now, along with the continuous expansion and the 670t/h of unit capacity and the increase of going up boiler participation peak regulation number of times, more and more higher to the requirement of boiler furnace safety monitoring system (or the FSSS part among the DCS) operational reliability.Because serious accidents such as detonation all might take place in the overall process that starts---operation---blowing out in boiler; especially more serious in the detonation of the explosion ratio operational process of ignition process to the damage of burner hearth; therefore the stability of coal dust firing is exactly the key parameter of coal-burning boiler safe operation; and its one-time detection equipment---flame detector; can have or not to make to the coal dust firing stability of single burner and flame and estimate accurately and judge that this effect in whole safety system is particularly important.
Fig. 7 is the empirical curve on No. 11 burners of a certain 670t/h boiler.In preceding 50 minutes, the pulverized coal feeder of four burners (upper and lower, left and right) adjacent with monitored burner all has one to stop restart procedure, stops to restart pulverized coal feeder process (the pulverized coal feeder rotating speed is 200 rev/mins during startup) twice for monitored burner front and back then.Figure middle and upper part curve is the recording curve of common flame detector; The curve of bottom is the recording curve of this flame detecting device.As can be seen from the figure, the fire extinguishing of 4 adjacent burners, ignition process do not have any impact to the single burner flare up fire in preceding 50 minutes, and it is very responsive to the fire extinguishing and the ignition process of the burner of two this locality, react also very fast, curve has two tangible grooves, and all there are precipitous negative edge and rising edge in the edge, and kindling point or fire extinguishing point are clear unusually, record value during fire extinguishing is also very little, when catching fire 10%; On the contrary, this moment, common fire probe but can not correctly reflect this process, even also had reverse trend two fire phases.Simultaneously, according to the situation of scene operation, the travelling speed of the pulverized coal feeder of generating plant pulverized coal boiler (feeder) is seldom below 200 rev/mins, so this single burner flare up fire has the ability whether the existence of single burner flame is made correct judgement fully.
Fig. 8 is the empirical curve on No. 4 burners of a certain 220t/h boiler.The pulverized coal feeder of monitored burner becomes disconnected powder fire extinguishing by 500 rev/mins, and then the some oil combustion gun.Figure middle and upper part curve is the recording curve of common flame detector, and the bottom is the recording curve of the utility model single burner flame detecting device.As can be seen, this flame detecting device can be made correct detection equally to the single burner flame of fuel oil from Fig. 8.
According to the single burner flame detecting device that the utility model is developed, result on trial proves that compared with prior art, the cost of manufacturing is low, the technological performance of instrument, reliability height.
The utility model single burner flame detecting device can be used as the boiler furnace safety guard, program control firing system, and the primary instrument that the flame among the FSSS (comprising the FSSS part among the DCS) detects is to satisfy the demand of fuel-burning power plant, petroleum chemical enterprise.
Claims (5)
1, a kind of single burner flame detecting device, it comprises a flame detecting probe and the signal processing unit be made up of lens combination (1), photoelectric commutator (2), it is characterized in that the numerical characteristic frequency spectrum analyser (4) among the signal processing unit is provided with key (6) by parallel bus and A/D converter (3) and parameter and is connected; Be connected with D/A converter (5) with display (7) by universal serial bus; Numerical characteristic frequency spectrum analyser (4), by A/D converter (3) high speed acquisition time domain electric signal, portion is transformed into frequency domain with time-domain signal and handles within it, divides three tunnel outputs with the single burner flare up fire value that comparison, computing draw;
A, deliver to display (7);
B, deliver to D/A converter (5), convert analog quantity to;
C, with threshold ratio, when being lower than, equaling threshold value and remaining to the regulation delay time, export a switching value.
2, according to the described a kind of single burner flame detecting device of claim 1, it is characterized in that, described flame detecting probe comprises quartz lens group (1), it is contained in the shell (12), places the front end of flame probe, and flame light focuses on the photoelectric cell (15) through light pipe (13), convert electric signal to, link to each other with circuit board (16) by lead, realize voltage---current conversion, its 4-20mA signal is delivered to signal processing unit through lead again.
3, according to the described a kind of single burner fire inspection flame pick-up unit of claim 1, it is characterized in that the frequency domain scope of described numerical characteristic frequency spectrum analyser (4) is 0-1000HZ.
According to the described a kind of single burner flame detecting device of claim 1, it is characterized in that 4, described photoelectric commutator can adopt any composition photoelectric commutator of light activated element of ultraviolet light, visible light, infrared light.
5, according to the described a kind of single burner flame detecting device of claim 2, it is characterized in that the visual angle of described flame detecting probe is 70 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03213260 CN2620189Y (en) | 2003-05-21 | 2003-05-21 | Fire detector for single burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03213260 CN2620189Y (en) | 2003-05-21 | 2003-05-21 | Fire detector for single burner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2620189Y true CN2620189Y (en) | 2004-06-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03213260 Expired - Lifetime CN2620189Y (en) | 2003-05-21 | 2003-05-21 | Fire detector for single burner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2620189Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105842514A (en) * | 2015-12-14 | 2016-08-10 | 湖南理工学院 | Voltage-regulating intelligent flame ion current detection circuit |
| CN106583961A (en) * | 2017-03-01 | 2017-04-26 | 湖南泰嘉新材料科技股份有限公司 | Monitoring probe for welding seam in continuous welding, and welding seam monitoring system and method |
-
2003
- 2003-05-21 CN CN 03213260 patent/CN2620189Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105842514A (en) * | 2015-12-14 | 2016-08-10 | 湖南理工学院 | Voltage-regulating intelligent flame ion current detection circuit |
| CN106583961A (en) * | 2017-03-01 | 2017-04-26 | 湖南泰嘉新材料科技股份有限公司 | Monitoring probe for welding seam in continuous welding, and welding seam monitoring system and method |
| CN106583961B (en) * | 2017-03-01 | 2023-10-24 | 湖南泰嘉新材料科技股份有限公司 | Continuous welding seam monitoring probe, welding seam monitoring system and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20030521 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |