DK2105669T3 - Flame monitoring and assessment device - Google Patents

Description

The invention relates to a flame monitoring and evaluation device for a combustion device according to the preamble of claim 1.

The features of claim 1's introduction are known from US 6,356,199 B1. US 6,356,199 B1 relates to a flame monitoring device, in which the ionization current of a flame rod is monitored with a direct current and an alternating current component. The output of the flame rod is supplied by means of an amplifier to a branching point at which three parallel paths for signal processing begin. The three paths serve to analyze the DC intensity, AC intensity and flicker frequency.

The combustion device can be operated with gaseous, liquid as well as solid fossil fuels or also residual substances (eg waste). As a combustion device, e.g. burners, flat burners, waste incinerators and the like.

In the optical monitoring and assessment of burns and fires, respectively, and the resulting flames using different radiation sensors in the ultraviolet, visible and infrared range, the arising rapid chemical compounds in a fuel by the oxidation with oxygen must be recorded and stored electronically in analyzable signals via current and voltage. The electromagnetic radiation detected by the radiation sensors provides information on very important combustion states, such as e.g. an optimal economic combustion, which must proceed with a complete reaction in the fuel-air-volume ratio process.

A complete combustion is spoken of when all the oxidizable constituents of the fuel have the highest possible amount of oxygen bound. The flame assessment allows the indication of the air number lambda, as well as a substantial adjustment aid and improvement in the control of the desired CO, CO2, NOX values, for which ecological and economic reasons are set limit values and limit areas respectively. One of the most effective options for energy saving is the CO 2 emission reduction and flame monitoring online, as well as the prevention of a powerful and rapid soot development in the boiler and in flue gas channels by means of CO monitoring.

EP 1 207 346 B1 discloses a flame retardant for an oil or gas burner, whereby an analyzer switch determines the zero throughput of a processed signal from a photosensor within a predetermined time unit and compares it to a predetermined limit value. . At the passage below the predetermined limit value, a disconnection signal is produced for the fuel supply. Accordingly, the assessment switch can evaluate the photosensor signal in terms of flicker frequency and / or amplitude of the detected flame radiation.

From DE 197 46 786 C2, a flame detector is known for the blue-burning flames of an oil or gas burner, in which a semiconductor detector with a spectral sensitivity in the near ultraviolet is used with a post-switched assessment switch which affects a fuel-combustion air ratio control device in accordance with the spectral distribution of the flame radiation. However, when emitting the flame radiation to larger wavelengths in the direction of the '' yellow area '', this can cause problems in such a way that the emigration increases despite increasing the combustion air fraction, and then the fuel supply is switched off. An analysis of the radiation captured by the photosensor to determine whether the burner is burning or, in the event that it does not burn, the fuel supply is immediately disconnected is not possible.

From DE 198 09 653 C1, a flame detector is known for the blue-burning flames of an oil or gas burner, which comprises a photosensor which detects the flame radiation and which has an increasing sensitivity from ultraviolet to infrared. It also has a post-switched analyzer switch which disconnects the fuel supply when the radiation falls in the range of 200 to 500 nm or the increase of the registered radiation intensity above 500 nm detects an emigration from the blue region. In many cases, the signal of the photosensor is considered two-channel-like, first for ultraviolet radiation to 500 nm, and second for visible and infrared radiation. This uses a special photo sensor with a special analysis, whereby no assessment of the fire condition, but only a safety-directed disconnection of the fuel supply.

From EP 1 256 763 A2, a flame monitoring device is known by oil-powered blow lamps which analyze the signal transmitted from a photo resistor in a two-channel manner. A first channel serves to record the average brightness. Another channel serves to record alternate parts resulting from the flickering of the flame. The flame is identified as burning properly only if there is a signal at both channel outputs. In this way, it must be ensured that the flame monitoring is not carried out with a defective photo resistor. The monitoring device is adapted to the pure identification of the flame and a disconnection of the fuel supply if the flame is considered non-burning.

For example, from the data sheet for Giersch FQD, flame detector, edition March '99. a flame detector which, in addition to detecting the presence of a flame, enables a quantitative statement of the quality of combustion, providing a signal dependent on the loss of soot. A signal from a photodiode is supplied to a microprocessor via two channels.

Based on US 6,356,199 B1, the object of the invention is to provide a flame monitoring device of the type specified in the preamble of claim 1 and which allows for a high redundancy for a necessary safety monitoring during continuous operation in a very simple manner together with an assessment of the fuel ratio. .

This is achieved by the features of claim 1.

This provides a flame monitoring and evaluation device for a combustion device. The flame monitoring and evaluation device has a sensor which detects the flame radiation and its pulsation, and an analysis switch then switched on. The analyzer switch detects whether the radiation received by the sensor corresponds to a burning flame. In the event of a negative result, the analysis switch provides a disconnect signal for the fuel supply. The sensor is connected to the analyzer switch via three channels, which are arranged as input channels for the analyzer switch. The analyzer switch is designed for simultaneous analysis of the flame frequency, the flame signal amplitude and the average radiation pressure. This results in the highest possible dynamics and accuracy in determining the flicker frequencies and amplitudes as well as the direct pressure. This results in a high redundancy for the necessary safety monitoring during continuous operation without having to use the otherwise known expensive glare operation. A compensation signal can be produced by means of the analysis switch, ie. a signal which, according to predetermined criteria, takes into account the three signals of the three channels, and an evaluation of the flame ratio is made on the basis of the signals of the three channels. By means of the three-channel analysis of radiation pressure, frequency and amplitude, further information can be obtained from the flame signal for the assessment and safety-directed processing. A clear indication of the combustion ratio is obtained, discrimination of the flame and a clear identification of noise signals. A periodic comparison of the sizes determined via the three channels allows the early detection of any unfortunate change in the combustion chamber.

The sensor is preferably formed as a photoelectric sensor, such as e.g. a photodiode, to provide a cost-effective optoelectronic flame monitoring and evaluation device. In most photosensors, the EWC is utilized so that an intrinsic oscillation or flushing of the flame monitoring and evaluation device is reduced. As a photosensor, a semiconductor sensor which also has an optical filter can preferably be used. The work area must begin at a wavelength of less than 300 nm and reach the infrared range. The maximum sensitivity is above 800 nm. The detection of radicals and their modulation frequencies in said range is also very important.

Preferably, the photo sensor used has a broad basic characteristic in a wide range with respect to the wavelength. Thus, it is possible to reliably determine the conditions prevailing in the fire chamber via the ratio between the modulated alternating (flame) and even (the background radiation of the fire chamber) (eg IR proportion, temperature, flame colors, etc.).

For a simple and inexpensive opportunity to realize the sensor by which both the flame frequency, the flame signal amplitude and the average radiation pressure can be measured, the sensor can preferably also be designed as an ionization, pressure or sound sensor.

The first separation of the three channels is done immediately after the sensor via a separate processing of the physical magnitudes of current (direct current) and voltage (frequency and amplitude). In particular, the separate processing of the physical sizes takes place in a simple manner via a resistor. The signal received from the photosensor is easily divided through the resistance into the physical size current and the physical size voltage, so that there is a direct correspondence between the sizes thus obtained. Thus, for the flame monitoring and evaluation, one and the same signal, which is processed differently, is used for the redundancy.

Preferably, the composition signal is arranged to be capable of being applied to a device for adjusting an optimum air regulation during combustion and / or the adjustment of the fuel supply. The composition signal is thereby connectable to the corresponding device for adjusting the air or fuel supply.

For the further increase of redundancy, a double zero-point review check can be performed in the analysis of the flame frequency. By means of the double zero-point check, the flame frequency is more accurately determined and can thereby lead to a more accurate composition signal.

Preferably, the assay switch is associated with a sensitivity control step. The sensitivity control step, which may be arranged hardware or software, regulates the sensitivity of the frequency channel and / or the amplitude channel depending on the signal of the beam pressure channel analyzed.

Preferably, branches are provided in the channel for the jet pressure and in the channel for the amplitude which leads to the cut-off link for the fuel supply. Thus, there is a further redundancy. Regardless of the analyzer switch signal, the disconnection of the fuel supply is feasible safely.

For maintenance and service work as well as in case of disturbance, it is advisable if the analyzer switch has a storage in which the parameter for disconnections and / or frequency histograms can be placed and read.

The sensor's signal is conveniently fed via a high temperature resistant fiber optic cable (fiberglass) from the firing area, and then it is supplied to the analyzer switch via three channels. Further embodiments of the invention will become apparent from the following description and subclaims.

The invention is described in more detail below with reference to the drawing, in which Figure 1 shows a schematic block diagram of an embodiment of a flame monitoring and evaluation device according to the invention, Figure 2 is a schematic representation of the amplitude of the flame depending on the time, Figure 3 is a first channel of the 1 shows a second and third channel in the block diagram image shown in FIG. 1; FIG. 5 is a representation of a representative size for radiation pressure measured via a first channel; and a sensitivity set on the basis of the radiation pressure; FIG. a third channel measured representative size for an amplitude in linear mapping; Fig. 7 is a view of a representative channel measured via a third channel for an amplitude in logarithmic mapping; and Figure 8 is a schematic block diagram representation of a further embodiment of a flame monitoring and rating device according to invention. Figure 1 shows an embodiment of a flame monitoring and evaluation device according to the invention. In the embodiment of Figure 1, between a sensor 1 formed as a photosensor and an analysis switch 2 in the flame monitoring and evaluation device, there is a three-channel connection between the photosensor 1 and the analysis switch 2. According to the embodiment shown in Figure 1, the analysis switch 2 is formed as a microprocessor.

The photosensor 1 may be provided in a combustion combustion chamber. A high-temperature glass fiber cable may be connected to the sensor for supply to the sensor to transmit the signal from the high-temperature range to the photosensor 1.

The channels shown in Figure 1 join in a lower temperature range outside the boiler. For the three channels shown in Figure 1, only one photo sensor 1 and thus a semiconductor is provided, which means a significant economical utilization for saving components in the switch.

The upper channel 1 (first channel) shown in Figure 1 serves to record the radiation intensity as the coefficient of the incident light flow on the photo sensor per receiving surface of the photo sensor, ie to record the radiation output and the average radiation pressure, respectively. The middle channel (second channel) shown in Figure 1 serves to record the flicker frequencies, which are the periodic changes of the flame intensities that, depending on the time, occur during the fuel-air oxidation process. The lower channel (third channel) shown in Figure 1 serves for the flame amplitude measurement.

The radiation determined via the first channel can be expressed as a percentage with the base unit Candela (Cd) via an output in the analyzer switch 2.

The flicker frequencies determined via the second channel, if the amplitude changes periodically, can be assumed over time as a periodically changed assessment signal, which fluctuates around a mean value. The modulated fluctuation of brightness determines the frequency and intensity of the flame. The frequency provides information on the velocity, the amplitude provides information on the magnitude of the radiation change, which is shown in Figure 2.

An accurate analysis of the frequency, ie a recording of the zero passages of the signal, e.g. happen as in EP 1 207 346 B1. This allows a very accurate recording of the flame frequency, which typically changes for each combustion device and fuel depending on the mode of operation.

The zero passages referred to as pulsation (Hz) for a signal in the second channel applied in a known manner relative to lambda correspond per unit of time substantially to the flicker frequency of the flame radiation. The zero passes are made by the analyzer switch, cutting the DC portion of the signal from the photosensor and placing the switch hysteresis around the zero line of the AC portion so that the noise portion of the signal is suppressed; that the dominant amplitudes remain. The obtained AC voltage signal is amplified so that, due to the cutting of the upper and lower sections, essentially square pulses of varying pulse width appear. The corresponding up and down sides are then counted on this square pulse and thus the zero passes. This is done per unit of time, e.g. per second.

If the number of zero passes per unit of time is greater than a predetermined limit value, e.g. 25, one assumes that there is a flame. If the number of zero passes is equal to the predetermined limit value or more, it is assumed that there is an acceptable flame during which the fuel supply is interrupted accordingly.

For a permit for continuous operation, the extension to the redundant registration of two flanks on the oscillations with the positive and negative zero passes in exclusive control of the impulse width is important. Via the conversion in the microprocessor, a measurement histogram can easily be offered galvanically separated via the display of an LED. An expensive Fourier analysis is not necessary. The telegram also contains statements about CO, CO2 and NOX conditions. In Figure 3, the first channel is shown again in detail. Between the photo sensor 1 and the analyzer switch 2, which is arranged as a microprocessor, there is provided a transimpedance amplifier 3, a low pass filter 4 and a logarithmic device 5. The first channel for recording the beam output is placed on an analogue-digital converter in the analyzer switch 2.1 the first channel there is a strong suppression of the inverters until a very low frequency.

The strong suppression is partly made possible by a resistor 6 connected to the photosensor 1. In channel 1, the 'current' of the photosensor 1's physical size is used. The cleavage via the resistor 6, which is switched on after the photosensor 1, occurs by the fact that, for the second and third, which are provided for recording the frequency and amplitude of the flame, the '' voltage 'is taken out via the resistor 6.

The resistor 6 serves as a star resistor for the production of a voltage value dependent on the size of the resistor 6 and the signal value of the photosensor 1, which is directly correlated with the current value of the first channel. In the second channel a band filter 7 and an operational amplifier 8. The channel 2 is applied to an analogue comparator in the analyzer switch 2. The resistor 6 is used, in contrast to the signal of the first channel where the equalizers are used, to supply the voltage drop across the second channel. 6. The band filter 7 is a tunable band filter of approx. eg. 150 to 200 Hz and a quality of 0.5 to exclude magnetization due to the electric alternating field. The low bandwidth also dampens the low frequencies dominating in the flame signal. Thereby, the band filter 7 is dimensioned such that even at large amplitudes the saturation is not achieved in order to avoid a frequency doubling at the subsequent capacitively coupled step. For this reason too, the subsequent steps are galvanically coupled. In the third channel is provided an operational amplifier 9 and a device 10 for accounting with logarithms, a precision transducer 11 and a low pass filter 12. The processing of the amplitude signals in the third channel is carried out by means of logarithms. The negative and positive half-waves reach via the low-pass filter 12 to the input of the analyzer switch 2, which is formed by means of an analog-digital switch. By biasing the control of the two operational amplifiers in the precision rectifier, the desired operating voltage range can easily be determined.

Via the three channels which have different filters, such as e.g. The low pass filter, the band filter and the high pass filter, ensure that the received signals which serve to analyze the beam pressure, the flicker frequency and the amplitude are redundant and with higher accuracy at the analyzer switch 2. Each channel has a signal path which is best adapted to the respective signal. The block diagram images shown in Figures 1, 3 and 4 are optimized for the signal guidance in the three channels. Thus, e.g. the amplitude measurement by means of the electronic components located in the third channel exclusively in the relevant measuring range, ie. the signal parts that would interfere with measurement are filtered out in the third channel (noise filtered and offset, respectively).

Resistance 6 immediately after the photosensor 1 separates the radiation pressure signal (first channel) and the flame frequency and amplitude alternation signal (second and third channels), and the signals are processed separately, thus obtaining a very early redundancy in the signal path.

The three channels allow a redundant determination of the flame radiation pressure, frequency and amplitude, whereby the analyzer switch 2 produces a compensation signal which allows for an assessment of the flame combustion conditions, taking into account predetermined criteria. The results from the individual channels can be added, subtracted or otherwise linked to the weighting of the compensation signal.

Via the first channel and the analysis of the radiation pressure determined by the analyzer switch 2, it is possible to verify the sizes determined via the two other channels, ie. the flicker frequency and amplitude of the radiation. In addition, via the radiation pressure, an almost qualitative statement about the temperature can also be obtained. By deviation from the nominal value of the measured radiation pressure, at least a statement of the trend of the temperature gradient and a pronounced assessment is possible.

By the assessment of the flame, it is meant here that not only a safety-directed switch-off is made by a recognition that the flame has gone out but that the fire conditions can be positively affected. Through the three-channel analysis of beam pressure, flicker frequency and amplitude, a very good and verifiable assessment is possible.

Verification means that one of the channels is used to verify the results determined through the other two channels. As mentioned, e.g. the first channel, i.e. signal for the radiation pressure, say to such verification and assessment. For example, the observed combustion migrates by increasing radiation pressure to an increased production of CO and by decreasing radiation pressure to an increased production of CO2. Therefore, the first channel for the radiation pressure can be used to optimally adjust the air / fuel mixture so that neither increased CO production nor CO 2 production is maintained, keeping the pressure as constant as possible. The setting can be done by a control being carried out e.g. with air supply valves or fans. Of course, the amount of fuel can also be set. In principle, the supply of less air leads to a lower frequency and greater amplitude, while the supply of more air leads to a higher frequency with less amplitude. The desired histogram for the optimum combustion, e.g. CO, CO2 and NOx values are determined at the work points of the incinerators. These are weighted frequencies, which are always below a typical oscillation width.

The signal of the flame combustion ratio can be transmitted contactlessly via an LED which is connected and controlled with the analyzer switch, the analyzer switch 2 transmitting information optically via the corresponding controlled LED. This information can then also be used for the lambda control, whereby the contactless optical transmission by LED is preferred to keep interference due to connections or EMV phenomena as low as possible. With the LED, which may be part of the flame monitoring device, an optical DFLI interface is provided for the flame monitoring device's data exchange with external devices.

The radiation pressure signal determined via the first channel can also be used to control or regulate apertures or optical filters which are switched on before the photosensor 1. This control can be carried out in such a way that at high radiation pressures the apertures are reduced and at low radiation pressures. do they increase or even change the filter.

Like the first channel signal, i.e. the signal representative of the radiation pressure, one of the other two signals from the other two channels can serve to verify the measured signals. The experience e.g. also possible that the signal of the amplitude, i.e. the third channel signal, is used to verify the measurement via the first channel (radiation pressure) and the second channel (frequency).

In addition, by means of the three-channel embodiment according to the invention, e.g. the possibility of a characteristic imitation of a relatively expensive GaP diode as a photosensor using a significantly more economically appropriate silicon diode. Using the logarithmic recording of the signal of the first channel, i.e. the signal representative of the radiation pressure, it is possible to emulate a linear characteristic in logarithmic imaging.

In the present embodiment, the behavior of a GaP diode as a photosensor occurs in that the radiation output determined by the first channel or radiation pressure, respectively, makes a sensitivity control via a sensitive control step of the second channel for the determination of the amplitude. In addition, in the first channel, the logarithm calculation device 10 is provided. It is thus a hardware solution. For the realization as a software solution, in the analyzer switch 2 for the first channel, a logarithmic view of the signal input size can be made. Thus, the measurement of radiation pressure can take place over a very large measuring range. Also in the first channel, the electronic components are chosen so that the signal is optimized for the analysis of the radiation pressure. Thus, depending on the measured radiation pressure via the first channel, the sensitivity setting is possible with respect to the signal in the third channel. In the "blue" radiation range of a combustion device a higher sensitivity and thus gain can be set. With increasing pressure, ie. if the radiation range of the combustion device passes into the area "yellow" and "infrared", the sensitivity can be re-adjusted or switched off from the increasing pressure. Thus, with increasing pressure, a lower gain or sensitivity is added with respect to the amplitude of the third channel. Instead of the sensitivity, an analog comparator (Schmidt trigger) can also be set so that a hysteresis is observed simultaneously. In Figure 5, a representation of a representative size of the radiation pressure measured via the first channel is shown. In this exemplary embodiment with a photosensitive sensor of the radiation, the analyzed signal (the current of the photosensor or photodiode) is associated with equivalent temperatures at the black beam device which is read on the upper x-axis. The radiation pressure is shown as a function of the current measured (the lower x-axis) of the photo sensor or photodiode. The radiation pressure signal increases with the increasing current of the photosensor. The value of the radiation pressure is read on the left y-axis. In Figure 5 the relative sensitivity is also applied, whereby the corresponding values can be read on the right y-axis. The sensitivity is up to a 10 μΑ diode current of 100% and then decreases at the larger currents of the photosensor. Figures 6 and 7 show the course of a representative size measured via the third channel for the amplitude of the flame. Figure 6 shows a linear view and Figure 7 shows a logarithmic view. For the exemplary embodiment with a photo sensor as a sensor, a voltage is shown for the photo sensor and photodiode, respectively, in case the sensitivity of the third channel signal input is set depending on the measured radiation pressure. In the logarithmic mapping, a linear characteristic of the signal is obtained via the third channel, i.e. amplitude.

By means of the first channel by which the radiation pressure is determined, a regulation is made for the measurement of the amplitude via the third channel, and the behavior of a GaP diode can also be imitated with a cheaper silicon diode. This prevents the disruptive effects of red-beamed walls, glowing boiler walls and flame pipes.

An example of the operation of a flame monitoring device according to the invention is as follows: when the combustion device is switched on, a quantization is carried out in which each signal in the three channels is monitored and the flame is first classified as burning when each measurement size in a channel is above a certain threshold or in a predetermined range. For example, it may occur that within the channel for the frequency of the connection within five time units of e.g. 140 ms a certain number of zero passes must be detected to assess the flame as burning. For the frequency, this means that, especially at a frequency greater than 50 Hz, the flame is considered burning as the flame is very often ignited with ignition transformers operating at 50 Hz and these can interfere with the flame rating. Furthermore, account must be taken, for example, of: genes arising from artificial light sources that fade out when considering frequencies from 50 Hz and multiples thereof, and should lead to the desire for safety disconnections.

The connection requires a minimum value for the amplitude channel. For the radiation pressure, it is analogous that only when the parameter is measured lying over a predetermined period of time beyond the threshold or a predetermined range does the flame burn safely.

The frequency may be determined to have both a frequency overrun and a frequency undercurrent identification as well as an equal frequency identification relative to a predetermined threshold value. When the flame burns, application-dependent setting provisions can be taken into account in the assessment switch 2, whereby a compensation signal can be produced which enables a flame ratio message. Depending on the fuel, other setting figures can be set in advance in the analyzer switch 2, which is taken into account for a flame assessment. The weighting of the individual signals of the three channels can be set according to the fuel in the analyzer switch 2, either automatically or pre-programmed in the analyzer switch.

An application-dependent setting is already only necessary in the frequency channel as well, because the different fuels can produce different flicker frequencies during combustion. For example, oil, light oil, different gases, different coal types, and additional combustion products have frequencies usually between 10 and 250 Hz.

It can for example. be determined that the dosage of the influence of the three signals on the three channels can be set via d rejeom switch on the analyzer switch 2. To enable this, e.g. the information about the individual channels is visualized graphically, thereby selecting a multidimensional image. Thus, the influence of the individual sizes can be read directly via the particular rotary switch.

In the event of discrepancies in the analyzed signals of the three channels, a cut-off signal for the fuel supply is automatically produced by the analyzer switch 2.

The weighted output signals of the three channels can be processed by analog, digital or mixed and / or stored. The analyzed measurements can be delivered multi-dimensionally visualized from the analysis switch 2 and in the event of a disconnection can provide a service technician with valuable information about the reason why a disconnection has occurred. Figure 8 shows an embodiment of the flame monitoring and evaluation device according to the invention, which, in contrast to the embodiment shown in Figure 1, further increases the redundancy in relation to the radiation pressure channel and the channel for the amplitude is independently monitored by the analysis switch 2 This is done through two additional microcontroller-free branches, which are associated with simple window or threshold discriminators 13, 14. The switching thresholds are then at the edges of the flame identification area. Thus, the two branches '' radiation pressure 'and' 'amplitude' of the channels lead to the disconnecting link 15, 16 the pre-combustion device without intermediate switching on of the analyzer switch 2. Via the two additional branches of the radiation pressure and the amplitude, no satisfactory evaluation of the flame ratio is possible, but only registration of whether the flame is burning or not.

A rotary switch 17 is also shown schematically for adjusting the effects of the three channels separately on the composition signal. With reference numeral 18 there is shown a connected and controlled LED connected to the analysis switch 2, which as described above can be transmitted optically contactless data.

Claims (13)

1. Flame monitoring and evaluation device for a combustion device with a sensor (1) which detects the optical flame radiation and its pulsation and a subsequent analysis switch (2) which determines whether the radiation received by the sensor (1) corresponds to a burning flame and at negative result produces a cut-off signal for the fuel supply, whereby the sensor (1) is connected to the analyzer switch (2) via three channels, as input channels for the analyzer switch (2) and the assessment switch (2) is adapted for simultaneously analyzing the flame frequency, and the average radiation pressure, thereby producing a compensation signal by means of the assessment switch (2), taking into account the three channels for the flame monitoring, and an evaluation of the flame based on the signals of the three channels, characterized in that immediately after the sensor (1) is provided with a mod condition (6) separating a first channel for determining the radiation pressure from a second channel for the separate determination of the flame frequency in which a band filter (7) and an operational amplifier (8) are provided, and for separating the amplitude is provided a third channel after the operational amplifier (8) separate from the second channel. Flame monitoring and evaluation device according to claim 1, characterized in that the sensor (1) is a photoelectric sensor. Flame monitoring and evaluation device according to claim 2, characterized in that the photoelectric sensor has a linear wavelength sensitivity. Flame monitoring and evaluation device according to claim 1, characterized in that the sensor (1) is an ionization electrode. Flame monitoring and evaluation device according to claim 1, characterized in that the sensor (1) is a microphone or pressure sensor. Flame monitoring and evaluation device according to one of claims 2 or 3, characterized in that by means of the signal from the radiation pressure channel, the wavelength sensitivity of a photoelectric sensor can be adapted to a GaP photodiode such that the respective output voltages are similar . Flame monitoring and evaluation device according to one of claims 1 to 6, characterized in that there is a direct correlation of the sizes supplied to the channels via the resistor (6). Flame monitoring and evaluation device according to one of claims 1 to 7, characterized in that the channel for analyzing the radiation pressure can be supplied with a current from the resistor (6) and the other channels for analyzing the flame frequency and the amplitude of the flame signal can be supplied with a voltage which falls across the resistor (6). Flame monitoring and evaluation device according to one of claims 1 to 8, characterized in that the composition signal produced by the analyzer switch (2) can be applied to a device for the setting of an optimal air regulation and / or fuel setting. Flame monitoring and evaluation device according to one of claims 1 to 9, characterized in that in the analysis of the flame frequency a double zero-point inspection is feasible. Flame monitoring and evaluation device according to one of claims 1 to 10, characterized in that the analyzer switch (2) is connected to a sensitivity control step for the frequency channel and / or the amplitude channel, and depending on the analysis of the signal from the radiation pressure channel, the sensitivity is adjustable or changeable by means of the analysis switch (2). Flame monitoring and evaluation device according to one of claims 1 to 11, characterized in that branches are provided in the channel for the radiation pressure and the amplitude leading to the cut-off link for the fuel supply. Flame monitoring and evaluation device according to one of claims 1 to 12, characterized in that the analysis switch (2) comprises a storage in which parameters for switch-offs and / or frequency histograms are pliable or readable.