JPS58104423A - Method for detecting burning condition of pulse combustion apparatus - Google Patents

Abstract

PURPOSE:To check if the burning conditions is satisfactory or not on the basis of the value obtained by measuring the number of ON-time and OFF-time of combustion. CONSTITUTION:A pulse combustion apparatus 1 is provided with a sensor 8 adapted to detect the flame in a combustion chamber 1, an amplifier 9, a wave- form shaper 10, a counter 11 adapted to measure and indicate the frequency of the signal transmitted by the counter 11, and a discriminating circuit 14 arranged to close a shut-off valve 12 installed in a fuel gas supply conduit 5 and actuate an alarm device 13 when the information outputted from the counter 11 or the measured frequency is less than a preset value. By such an arrangement, it is possible to check if the flame of the pulse combustion apparatus dies out or not and if the apparatus is working properly and automatically interrupt the fuel gas supply and give an alarm, if the flame of the apparatus died out if it is working improperly. Accordingly, it can be discriminated without fail not only if the fire of the apparatus dies out or not, but also if an improper burning condition is continuing or not.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a pulse combustion device, specifically, a combustion chamber having a fuel gas supply passage and a combustion air supply passage connected to one end of the combustion chamber via a backflow prevention valve mechanism, and one end of the combustion chamber to the other end thereof. A till pipe forming a combustion exhaust gas discharge path is connected to the side to allow fuel gas and combustion air to flow into the combustion chamber due to the dynamic inertia of the combustion exhaust gas accompanying an explosion, and to prevent the combustion of high-temperature combustion exhaust gas. The present invention relates to a method for detecting a combustion state of a combustion apparatus configured to cause an explosion due to backflow into a chamber.

The above-mentioned pulse combustion device does not supply air,
It does not require energy for ignition, high-load combustion is possible, and the combustion exhaust gas pulsates and becomes extremely high pressure, so the till pipe can be made elongated, making it possible to efficiently heat fluids using the till pipe. Although it has the advantage of being able to perform
It burns intermittently over 500 times, and operates at extremely delicate timing. Therefore, the combustion state tends to worsen or misfire occurs due to disturbances, and it is required to accurately detect whether the combustion state is good or bad.

Therefore, one possible method would be to detect the pressure in the combustion chamber or till pipe, etc., and determine that combustion is good if the pressure is above a set value, and that combustion is poor if the pressure is below the set value. , it is practically impossible to accurately measure small changes in pressure value 1 due to the limitations of the performance of the measuring device. It was impossible to know that it was continuing in poor condition.

In view of the above-mentioned circumstances, an object of the present invention is to provide an 11+1 method that not only detects whether or not there is a misfire but also accurately detects whether or not combustion is continuing properly.

The combustion state detection method of a pulse combustion device according to the present invention is characterized by measuring the number of intermittent combustions and detecting whether the combustion state is good or bad based on the measured value. By making effective use of the fact that combustion is stable and intermittent at regular intervals determined by the equipment design, even if there are small changes in the equipment, it can be performed with high precision.
By detecting the combustion state based on the measurable number of intermittent combustion cycles, it is possible to reliably determine not only whether there is a misfire, but also whether combustion is continuing in a poor state, which was previously impossible. As a result, it has become possible to reliably perform pulse combustion with good fuel efficiency and less air pollution from exhaust gas.
・) Furthermore, when measuring the number of intermittent combustion cycles, it is generally detected as a wave signal with a specific layer wave number.On the other hand, there are almost no noise signals with a stable frequency in reality, so it is difficult to detect disturbances in the information processing during measurement. ＜This also allows for highly accurate detection.

Next, an embodiment of the invention will be described using an exemplary diagram.

A combustion air supply M (31ffi) equipped with an electric fan +21'e is connected to the upper end side of the combustion chamber 11+ via a backflow prevention valve mechanism (4a), and a backflow prevention valve mechanism (4a) is connected to the upper end side of the combustion chamber 11+.
4b) A straight tail pipe (61) is connected to the fuel gas supply path (5) having a fuel gas supply path (5), which forms a combustion exhaust gas discharge base, to the lower end side of the combustion chamber +11, and a starting ignition is connected to the combustion chamber 111. A plug [71't- is attached, thereby composing a pulse combustion device.

The operation of the above pulse combustion device will be explained.

At the time of startup, the electric blower (2) is fully activated to supply fuel gas and combustion air at an appropriate mixing ratio to the combustion chamber fi+, and to cause an explosion within the combustion chamber using the spark plug (7).' As a result, combustion emissions associated with the explosion.

Due to the dynamic inertia of the gas, both the supply paths 1B+, (6
Appropriate amounts of fuel gas and combustion air are supplied to the combustion chamber ill.
After that, the high-temperature combustion exhaust gas flows back from the tail pipe (61) to the combustion chamber TT7 due to the reaction of the explosion, and the thermal energy of the combustion exhaust gas causes another explosion, and this operation is repeated. Note that the operation of the electric fan (2) and the spark plug (7) is stopped when pulse combustion becomes stable.

For example, a light heavy element that changes the stain flow by the flame in the combustion chamber fi+, opening of the backflow prevention valve mechanisms (4a) and (4b),
Switches and combustion chambers that are important to operate during closing operation 1.1
1 pressure fluctuation and backflow prevention valve mechanism (4a), (4b
), a piezoelectric element that generates a voltage due to the strain K associated with the opening/closing operation of
) Attached to the pulse combustion device, it selects the one level or higher or the highest level from the signals sent from the sensor (8) via the amplifier (91), and also sets the cycle according to the frequency of the selected signal. A waveforming device αo+y configured to generate a pulse signal of When the value falls below the set value, the cutoff valve (121) of the fuel gas supply path (5) is closed and the alarm device (13) is activated.
) is provided, which detects whether the pulse combustion device has misfired and whether it is operating normally, and automatically stops the fuel gas supply if a misfire or malfunction occurs. The configuration is such that notification is made.

When designing a pulse combustion device, it is desirable to avoid noise and ensure that the frequency of the signal from the sensor (81) during stable combustion does not match the frequency, number, or overtones of the AC power source.

Measuring the number of intermittent combustion cycles, detecting the quality of the combustion state, taking measures to detect poor combustion, etc. may be performed manually, and any device may be used for these purposes.

The pulse combustion device can be used for various heating purposes or for the purpose of utilizing exhaust energy, and can be modified in various ways in its specific configuration.

[Brief explanation of the drawing]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings are schematic explanatory diagrams illustrating the main aspects of the combustion state detection method for a pulse combustion apparatus according to the present invention and showing the configuration of the pulse combustion apparatus.

Claims (1)

[Claims] A combustion state detection method for a pulse combustion device, characterized by measuring the number of intermittent combustion cycles and detecting whether the combustion state is good or bad based on the measured value.