JPS59170618A - Method of discriminating combustion flame of fuel of different kind - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for identifying flames generated by combustion of solid wood frame twist.

In spit type and dual burner boilers, especially those with high output, crushed coal (hereinafter referred to as crushed coal) is often used as the burner material. However, since crushed coal is difficult to ignite, an oil burner or crushed coal burner is additionally provided as an additional energy source.

This is sometimes used to ignite crushed coal.

Also, the oil burner that is supposed to ignite the crushed coal in the fifth step? It is also known to provide a gas burner for lighting the tun. Once the crushed coal has ignited, the oil burner may be shut off and only on a new start of the boiler, when the crushed coal burner is extinguished, or when additional fuel is required for this boiler. May be reignited. Similarly, it is common practice to shut off the gas burner and relight the gas burner when there is a need to light the oil burner.

After igniting the oil burner, the oil burner was ignited for a predetermined period of time to start the boiler! There are control means for supplying crushed coal, for example from a fuel crusher, to the boiler via the necessary feed lines. If for some reason the crushed coal reaches the burner later than expected, the non-selective ignition/extinction monitoring system will not be able to distinguish between a green lotus coal flame and a real oil flame. , you will not be able to discover this error in advance of stopping the oil flame. Therefore, a small amount of coal is introduced into the combustion chamber of the boiler with an inevitable risk of explosion. This is particularly a drawback in dual burner boilers.

In order to alleviate this problem, attempts are currently being made to provide means to specifically distinguish between oil burner flames and coal burner flames. This has led to the use of an identification method based on the difference in optical spectra between coal and oil flames, which uses an ultraviolet sensor that detects the sensitive ultraviolet component of the oil flame spectrum. When the flame detected by the second sensor exhibits almost completely non-ultraviolet radiation.

This flame is presumed to be a coal flame. Such systems have two major drawbacks.

First of all, this system requires two sensors that need separate signal processing, and since the two sensors cannot be physically located in the same location, one sensor must be precisely aligned to Considerable care must be taken to ensure that the same point within the image is in focus. Second, a highly reliable flame monitor is required to reliably indicate the presence of a coal flame.

On the other hand, attempts are also known to utilize the positional differences in the flame fronts of the oil burner and coal nozzle to determine which flame is currently present. However, this method is unreliable because there are often cases where there is no detectable difference in the flame front, such as when using concentrated flame markers.

SUMMARY OF THE INVENTION The object of the present invention is to eliminate the above-mentioned drawbacks and provide a method for identifying the flames of different memorabilia.

The method of classifying the flames generated by the combustion of the dead flames according to the present invention includes the steps of detecting the intensity of the light emitted from the flame by a detection means T that generates a light emitted according to the intensity. , the process of monitoring and observing this variation in intensity, and the process of determining one aspect of this variation at high and low frequencies, respectively, and determining the ratio of the range of variation at frequency and low frequency. and providing a signal indicating by the numerical value of the ratio that the monitored flame is a flame of a particular ffg l'l.

Another method within the same principle is to feed the light intensity detector directly into a separate Fourier transformer to directly determine the spectrum of amplitude variations in the light intensity from the flame. generates an output signal. This determines the amplitude ratio between the high and low frequencies of this spectrum, and from this ratio value it can be further confirmed that the flame being monitored is a specific flame.

Therefore, if the method according to the invention is applied in particular to a boiler with an oil burner 41 for igniting a coal burner, then during the ignition of the oil burner, the value of the determined ratio is determined by an output signal, for example from a microprocessor with sensing means. It appears as a result. This output Shinnishiki is converted into an image display device.

It can be supplied to any suitable means such as a deafness alarm. The coal flame is also supplied with a numerical value of the difference in ratios which, when fed to a visual or audible alarm, will act as a precise finger to alert them that the coal burner is working properly. If a known predetermined period of time has elapsed after the external oil burner has been ignited, the duration of the signal depending on the ratio value created by monitoring the oil flame will itself This can be a visual or audible signal to indicate that there is no flame.

If the coal flame suddenly goes out while the boiler is running, there will be no output, and this no-output state will cause the fire to be extinguished. It can be used for a long time.

Furthermore, it is desirable to monitor the flame within two [^1 rectangular frequency ranges] by filtering, for example electrical filtering. Two fixed frequency ranges are 100
Hz±20Hz and 300Hz±5 (l Hz
That's convenient.

1 is a circuit diagram of a means for implementing the present invention. Incident light from the flame reaches a photoelectric sensor 10. The output of the photoelectric sensor 0 is filtered by two bandpass filters I, 12.

Filter 1] operates in the range of 300)iZ.

Filter 2 operates in the 100 Hz range.

The filtered signal from each filter is fed through a respective rectifier 13.14 to a low pass filter 15.16. The first signal from filter 5 is fed via multiplier 17 to comparator 18 and the second signal from filter 6 is fed directly to comparator 18 . No. G4 from this comparator 18 represents the entire relationship between the ratio of variation (from the highest frequency to the lowest frequency) and the set value. If this signal is above the set value, it is a signal that an oil flame is present, and if it is lower than the set value, a coal flame is present.

[Brief explanation of drawings]

The drawing is a circuit diagram of a means for implementing the method of the invention. 10... Photoelectric sensor, 11.12... Band pass filter, 15.16... Low pass filter, 18...
Comparator. Applicant's agent Patent attorney Hiko Rin Ushiki0

Claims (1)

[Claims] (1) A step of detecting the intensity of the light emitted from the flame by a detection means that generates an output signal +3 corresponding to this intensity, and b I
a step of monitoring changes in intensity; High frequency and low li! , a step of determining the width of the =i ■ fluctuation with a 1 mantissa, and a step of calculating the ratio of the fluctuation width at the high frequency and the low frequency. A method for identifying twisted and fired fire arrows of different kinds of fuels, characterized by obtaining an output signal represented by a numerical value of the ratio of fuel consumption. (Step 21 of detecting the intensity of the light emitted from the flame with a detection means having an output No. 48 corresponding to this intensity, and a step of detecting the intensity of the light emitted from the flame with a detection means having an output No. 48 corresponding to this intensity, and a step of detecting the pre-distributed output signal in order to directly obtain the spectrum of the amplitude fluctuation of the intensity of the light from the flame. 1 feeding directly to the separation Fourier transformer
and: FI m<ri・tonori? l84IJ! , determining a ratio of amplitudes at a lower frequency and generating an output signal indicating that the flame monitored by the value of the ratio is a flame of a particular fuel. The combustion of Ooku's discernment method. 3. The method of claim 1, wherein the flame is monitored within two fixed frequency ranges with appropriate filtering. (4il) Identification method according to claim 2, wherein the flame is monitored in two fixed frequency ranges by suitable filtering. (5) Claim 3, wherein the filtering is an electrical filtering. (61) The identification method according to claim 4, wherein the filtering is electrical filtering. (7) The two fixed frequency ranges) are 100H!
The identification method according to claim 3, which is ±20Hz and 300Hz±5oaz. (8) The two fixed frequency ranges are 100Hz±20
H! and 3ooaz±5oaz. t91 filtering the output of the photoelectric sensor by a first bandpass filter operating in a range of 300Hz±5out and a second bandpass filter operating in a range of 100Hz±20H2; fig: A step of supplying the filtered signal from each band-pass filter to a corresponding eleventh and second low-pass filter via a rectifier; The output from the low-pass filter (, ==i-Q) is fed to the comparator via a multiplier and the output signal from the second low-pass filter is connected to the second band-pass filter. the output signal from the comparator representing the relationship between the ratio of the amplitude variation from the highest frequency to the lowest frequency and the set value of the fuel in the monitored flame.
1. A method for identifying combustion flames of different types of twisting families.