KR200481203Y1 - Boiler flame monitoring system - Google Patents

Abstract

A boiler flame monitoring system is disclosed. The boiler flame monitoring system includes a flame detecting unit for detecting a flame generated in a burner; The control unit receives the intensity of the flame and the flame frequency information from the flame sensing unit, programs the flame intensity and the flame frequency signal, and determines whether the burner is ignited or not according to the calculated flame intensity and the calculation result of the flame frequency signal, A microprocessor for judging whether or not the fire extinguishing system is in operation; And a display unit for receiving the intensity and the flame frequency of the flame calculated and calculated by the microprocessor, outputting the intensity of the flame and the flame frequency, and displaying whether the burner is ignited and whether or not the burner is extinguished, The microprocessor includes a blackening determination unit, wherein the blackening determination unit compares the intensity of the flame using the flame signal measured when the soot is generated around the flame sensor or the burner, and the calculated result value of the flame frequency signal The first comparison mode and the second comparison mode are preliminarily input.

Description

[0001] BOILER FLAME MONITORING SYSTEM [0002]

The present invention relates to a boiler flame monitoring system, and more particularly, to a boiler flame monitoring system capable of preventing errors due to blackening phenomenon and capable of stable operation.

The boiler supplies combustion fuel such as gas, coal, oil or the like according to the demand of the user to generate ignition, or cut off the supply of combustion fuel to extinguish it. Such boilers that perform ignition and extinguishment as main functions are divided into small boilers such as domestic boilers and medium and large industrial boilers used in factories and power plants.

In general, a small boiler is capable of performing the function required by the boiler by detecting only the ignition or extinguishing state of the flame generated by the supply and interruption of the combustion fuel. However, in the case of a medium / large-sized industrial boiler, not only the presence or absence of a burner flame is determined, but also an analog current signal proportional to the flame intensity and the flame frequency (flame blink phenomenon) state is output to enable the burner to operate stably and efficiently It is required to aim for complete combustion. Accordingly, a system capable of detecting the flame of the boiler is installed and operated.

As a conventional technique for a boiler flame detection system for detecting a flame of a boiler, there is a patent No. 171263. According to this patent, a flame detection sensor is installed so as to be connected to a metal pipe inserted into an outer wall of a boiler, and the detected signal is converted into a constant current output and transmitted to a flame intensity amplifying unit installed at a remote place. In the amplification unit, a flame intensity analog signal and a signal obtained through a flame intensity converter are used to display a flame state by an external current indicator. Then, the signal passed by the comparator is transmitted as a digital signal to the frequency synthesizing output unit, and at the same time, a fault indication, L.Set indication, and H.Set indication are provided for blinking, The relay is driven based on the logic circuit, and whether or not the flame is normal is displayed by the light emitting diode.

However, such a conventional boiler flame detection system may cause frequent errors. For example, soot may be generated in a situation where the flame is continuously maintained, and soot may be generated at or around the flame detection sensor. This blackening phenomenon lowers the intensity of the flame and the frequency of the flame. At this time, the boiler flame detection system judges that the flame of the burner is extinguished and there is a problem that the flame is extinguished.

In addition, since the conventional boiler flame detection system is generally supplied with a power supply as one power supply module, the operation of the entire detection system is stopped when the power supply module is damaged, so that the operation of the detection system is not stable.

Therefore, a problem to be solved by the present invention is to prevent malfunction that the flame of the burner is judged to be extinguished when the blackening phenomenon occurs, improve the stability of operation, and store the main data related to the flame The present invention is to provide a boiler flame monitoring system which is capable of performing quick cause analysis in the event of a fault, facilitates maintenance, and improves the visibility to check the flame condition.

According to an aspect of the present invention, there is provided a boiler flame monitoring system including a flame sensor for detecting a flame generated in a burner and outputting a flame signal, and a controller for classifying the flame signal into a flame intensity and a flame frequency signal A flame detection unit including a flame signal conversion unit for outputting the flame signal; The control unit receives the intensity of the flame and the flame frequency information from the flame sensing unit, programs the flame intensity and the flame frequency signal, and determines whether the burner is ignited or not according to the calculated flame intensity and the calculation result of the flame frequency signal, A microprocessor for judging whether or not the fire extinguishing system is in operation; And a display unit for receiving the intensity and the flame frequency of the flame calculated and calculated by the microprocessor, outputting the intensity of the flame and the flame frequency, and displaying whether the burner is ignited and whether or not the burner is extinguished, The microprocessor includes a blackening determination unit, wherein the blackening determination unit compares the intensity of the flame using the flame signal measured when the soot is generated around the flame sensor or the burner, and the calculated result value of the flame frequency signal The first comparison mode and the second comparison mode are preliminarily input.

The monitoring system may further include a power supply unit, wherein the power supply unit includes a first power module and a second power module, and the first power module and the second power module supply power to the monitoring system independently .

The display unit may be configured to simultaneously display the intensity of the flame and the flame frequency.

The system may further include a database unit, and the microprocessor may input the flame signal, the intensity of the flame, the flame frequency, and analysis information of the blackening determination unit to the database unit.

Wherein the blackening determination unit determines whether the percentage of the intensity of the flame output to the display unit is 30% or less and the percentage of the flame frequency output to the display unit when the flame frequency is lower than before, If the value falls below 20% of the previous percentage value, it can be judged that blackening has occurred.

By using the boiler flame monitoring system according to the present invention, it is possible to prevent a malfunction that determines that the flame of the burner is extinguished when blackening phenomenon occurs.

Also, since the power supply unit is composed of a plurality of modules, it is possible to continuously supply power even if one of the modules is damaged, so that the stability of the monitoring system can be improved.

In addition, the main data related to the flame is stored during operation of the surveillance system, and it is possible to perform a quick cause analysis on the basis of the main data in the event of a fault, so that it is easy to maintain and provide reference data for further improved monitoring system design can do.

In addition, since the flame intensity and the flame frequency can be checked at the same time during the operation of the monitoring system, the visibility of checking the flame condition of the boiler can be improved.

1 is a block diagram conceptually illustrating a configuration of a boiler flame monitoring system according to an embodiment of the present invention.
FIGS. 2A and 2B are diagrams for explaining an experiment for measuring changes in flame intensity and flame frequency by applying a blackening phenomenon condition to the flame detection sensor for setting the first comparison mode and the second comparison mode.
Fig. 4 illustrates the display unit shown in Fig.

Hereinafter, a boiler flame monitoring system according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It should be understood, however, that the appended claims are not intended to limit the invention to the particular forms disclosed, but to include all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing. In the accompanying drawings, the dimensions of the structures are enlarged from the actual size in order to clarify the present invention.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a part or a combination thereof is described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

1 is a block diagram conceptually illustrating a configuration of a boiler flame monitoring system according to an embodiment of the present invention.

Referring to FIG. 1, the boiler flame monitoring system according to an embodiment of the present invention may include a flame sensing unit 110, a microprocessor 120, and a display unit 130.

The flame detection unit 110 may include a flame detection sensor 111 and a flame signal conversion unit 112.

The flame detection sensor 111 is installed at a position where the flame generated in the boiler can be detected. For example, the flame detecting sensor 111 may be a flame detecting sensor for detecting a flame generated by burning coal, oil, or gaseous fuels through a metal pipe inserted through an outer wall of a boiler or by inserting an optical fiber cable into a boiler, Can be detected. The flame detection sensor 111 is not limited to a specific means for detecting a flame. For example, the flame detection sensor 111 may detect the flame through a photodiode. In this case, the photodiode can change the output according to the intensity of the flame, and thus detect the intensity of the burner flame.

The flame signal conversion unit 112 receives the flame signal output from the flame detection sensor 111 and classifies the flame signal into flame intensity and flame frequency signal and outputs the flame signal. For example, the flame signal converter 112 may include a logarithmic amplifier (not shown), a signal ballast (not shown), a differential amplifier (not shown), and the flame signal may include an algebraic amplifier, a signal ballast, So that the intensity of the flame and the flame frequency can be generated.

The microprocessor 120 may receive the flame intensity and flame frequency output from the flame sensing unit 110, that is, the flame signal conversion unit 112. The intensity of the received flame and the flame frequency are programmed, and the intensity of the calculated flame and the frequency of the flame are logically determined to determine whether the burner is ignited or whether the burner is extinguished according to the result. Here, the calculation of the flame intensity and the flame frequency refers to processing with a value that can be processed by the microprocessor 120 to be a logic value and a value that can be outputted to the display unit 130 (for example, percentage (%)).

For example, the microprocessor 120 is provided with a comparison value for comparing the intensity of the flame inputted from the flame signal converter 112 and the measured value of the flame frequency, that is, the lower limit of the intensity of the flame, The lower limit value and the flame frequency upper limit value can be set in advance. In this case, the intensity of the calculated flame and the output of the logic result of the flame frequency are determined such that the intensity of each flame and the flame frequency are within the range of the lower limit of the flame intensity, the upper limit of the flame intensity, 1 ", or " 0 ".

In order to determine whether the burner is ignited and whether the burner is to be extinguished, for example, when the logic result is 1 and the ON delay time is continuously passed, It is determined that the flame is normal, and conversely, when the logic result is 0 and the OFF DELAY time is continuously passed, it can be determined that the burner is in a digested state and the flame is not normal.

Meanwhile, the microprocessor 120 may include a blackening determination unit 121.

The blackening determination unit 121 is configured to prevent an error that determines that the burner has been extinguished when soot is generated around the flame detection sensor 111 or the burner. For this purpose, the blackening determination unit 121 determines whether or not the flame is detected based on the intensity of the flame using the flame signal measured when the soot is generated around the flame sensor 111 or around the burner, 1 comparison mode and a second comparison mode can be input in advance. The first comparison mode may be a comparison mode for flame intensity and the second comparison mode may be a comparison mode for flame frequency.

In this case, the first comparison mode determines whether the percentage value of the intensity of the flame output to the display unit is 30% or less when the intensity of the flame and the flame frequency are lower than before, May be set to determine whether the percentage value of the flame frequency that has been output to the division has dropped below 20% of the previous percentage value.

When the intensity of the flame and the frequency of the flame are lower than before according to the setting of the first comparison mode and the second comparison mode, the percentage of the intensity of the flame output to the display unit is 30% If the percentage value of the flame frequency is lower than 20% of the previous percentage value, it can be determined that the blackening phenomenon has occurred.

In order to set the first comparison mode and the second comparison mode, an experiment was conducted to measure the change in flame intensity and flame frequency by applying a blackening phenomenon condition to the flame detection sensor 111. This is as follows.

First, the flame intensity and flame frequency displayed on the display unit 130 before the experiment were confirmed. As shown in FIGS. 2A and 2B, the flame intensity and the flame frequency displayed on the display unit 130 before the experiment were represented by 54% and 56%, respectively.

Then, similar conditions of the blackening phenomenon were given to the flame detecting sensor 111 by using the flame of the candle. That is, the sensing part of the flame sensor 111 is brought close to the flame of the candle, and the soot caused by the flame of the candle is attached to the periphery of the sensing part for a predetermined period of time. As shown in FIGS. 3A and 3B, the flame intensity and the flame frequency displayed on the display unit 130 were 25% and 48%, respectively.

According to the results of this experiment, the intensity of the flame is 30% or less when the blackening phenomenon occurs, and the flame frequency is reduced to within 20% of that before the blackening phenomenon.

Therefore, the first comparison mode and the second comparison mode, which are preset in the blackening determination unit 121, are comparatively accurate setting values set through experiments.

The display unit 130 receives the intensity and flame frequency of the flame calculated and calculated by the microprocessor 120, outputs the intensity of the flame and the flame frequency, and determines whether or not the burner is ignited and whether or not the burner is extinguished Can be displayed. For example, the intensity of the flame and the flame frequency may be expressed as a percentage according to the result of calculation of the flame intensity and the flame frequency performed in the microprocessor 120, and when the burner is in the ignition state, On ", and when the burner is in the extinguished state, it can be displayed as" No Flame ". The display unit 130 may simultaneously display the intensity of the flame and the flame frequency as a percentage when the flame intensity and the flame frequency are displayed. This is illustrated in FIG.

Meanwhile, the boiler flame monitoring system according to one embodiment of the present invention may include a power supply unit 140 and a database unit 150.

Power supply 140 provides power to the boiler flame monitoring system. That is, power is supplied to the flame sensing unit 110, the microprocessor 120, and the display unit 130. The power supply unit 140 may include a first power module 141 and a second power module 142. The first power module 141 and the second power module 142 may be configured to supply power to the monitoring system independently of each other. The first power module 141 supplies power to the surveillance system and the second power module 142 supplies power to the surveillance system in case of an emergency such as when the first power module 141 is damaged . Or vice versa. The first power module 141 and the second power module 142 may be connected to a commercial power source.

The database unit 150 may store the main data of the monitoring system. For example, the database unit 150 is electrically connected to the microprocessor 120, and the flame signal, flame intensity, flame frequency, and analysis information of the blackening determination unit 121 are input from the microprocessor 120 and stored . The information stored in the database unit 150 can provide data capable of prompt cause analysis in the event of a failure of the surveillance system and can provide reference data for designing a further improved surveillance system in the future.

When the blackening phenomenon occurs in accordance with the blackening phenomenon determination of the blackening determination unit 121, the microprocessor 120 determines that the flame of the burner has been extinguished, using the boiler flame monitoring system according to one embodiment of the present invention It is possible to prevent malfunction.

In addition, since the power supply unit 140 includes the first power module 141 and the second power module 142, even if any one of the first power module 141 and the second power module 142 is damaged, It is possible to supply power, thereby improving the stability of the surveillance system.

Also, it is possible to store important data when the surveillance system operates, and to perform quick cause analysis on the basis of the main data, so that it is easy to maintain and provide reference data for further improved surveillance system design in the future.

In addition, since the flame intensity and the flame frequency can be checked at the same time during the operation of the surveillance system, the visibility of checking the flame condition of the boiler can be improved.

The description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the scope of the invention. Thus, the present invention should not be construed as limited to the embodiments set forth herein but is to be accorded the widest scope consistent with the principles and novel features set forth herein.

110: Flame detection unit 111: Flame detection sensor
112: Flame signal conversion unit 120: Microprocessor
121: Blackening determination unit 130: Display unit
140: Power supply unit 141: First power supply module
142: second power module 150: database part

Claims (5)

A flame detection unit for detecting a flame generated in the burner and outputting a flame signal; and a flame detection unit including a flame signal conversion unit for classifying the flame signal into a flame intensity signal and a flame frequency signal and outputting the flame signal;
The flame intensity and the flame frequency information are received from the flame detection unit. The flame intensity and the flame frequency signal are programmed and processed as a percentage (%), and the calculated flame intensity and flame frequency signal operation result value A microprocessor for determining whether the burner is ignited and whether the burner is to be extinguished; And
And a display unit for receiving the intensity of the flame calculated in the microprocessor and the flame frequency, outputting the intensity of the flame and the flame frequency, and displaying whether or not the burner is ignited and whether or not the burner is extinguished,
Wherein the microprocessor includes a blackening determination unit,
The blackening determination unit may determine whether the blackening determination unit determines that the flame is in a first comparison mode and a second comparison mode for comparing the intensity of the flame using the flame signal measured when the soot is generated around the flame sensor or the burner, Is input in advance,
Wherein the blackening determination unit determines whether the percentage of the intensity of the flame output to the display unit is 30% or less and the percentage of the flame frequency output to the display unit when the flame frequency is lower than before, Is set to determine that a blackening phenomenon has occurred when the value of the percentage is lower than 20% of the previous percentage value.
Boiler flame monitoring system. The method according to claim 1,
The monitoring system further includes a power supply unit,
Wherein the power supply unit includes a first power module and a second power module,
Wherein the first power module and the second power module are configured to independently supply power to the monitoring system,
Boiler flame monitoring system. 3. The method of claim 2,
Wherein the display unit is configured to simultaneously display the intensity of the flame and the flame frequency.
Boiler flame monitoring system. The method according to claim 1,
The system further includes a database unit,
Wherein the microprocessor inputs the flame signal, the intensity of the flame, the flame frequency, and the analysis information of the blackening determination unit to the database unit.
Boiler flame monitoring system. delete

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