JPH08210774A - Vibratory combustion drying device - Google Patents

Abstract

PURPOSE: To provide a vibratory combustion drying device capable of improving a drying efficiency after obtaining a pressure wave of high temperature and operating stably against variation of load by attaining a wide turn-down ratio. CONSTITUTION: A flame holder 22 is assembled in a combustion chamber 20, combustion is carried out in the flame holder 22, combustion noise is set to be resonant against the combustion chamber 20 and a tail pipe 21 to generate a vibration and then a pressure wave of high temperature is injected from the tail pipe 21 toward an item to be dried.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oscillating combustion dryer for heating and drying powder containing water, waste, etc. by utilizing high temperature pressure waves.

[0002]

2. Description of the Related Art As a device for heating and drying an object to be dried by utilizing a high temperature pressure wave, a drying device utilizing pulse combustion is known. The drying device using this pulse combustion,
As shown in FIG. 3, the pulse combustor 1, the tail pipe 2,
It consists of a distributor head 3, a gas flapper valve 4, an ignition plug 5, an air flapper valve 6, and a dried material hopper 7. The fuel sucked into the combustion chamber 1a from the distributor head 3 and the air flapper valve 6 are passed through the combustion chamber 1
The air sucked into a is mixed in the combustion chamber 1a, ignited by the plug 5 to perform explosive combustion (A), and the combustion gas is jetted from the tail pipe 2 to the downstream by this explosion pressure to dry the material to be dried. The object to be dried 8 supplied from the hopper 7 is dried (B). Then, a cycle of continuously sucking new fuel and air into the combustion chamber 1a by the action of a negative pressure generated by the inertia of the flow of the combustion gas in the tail pipe 2 (C) and burning the mixture again is repeated. It is a thing.

[0003]

However, the above-mentioned drying apparatus utilizing pulse combustion has the following drawbacks. a. The gas and air flapper valves 4 and 6 are for the purpose of preventing backflow of gas and air.
Since 6 is constantly vibrating, there is a problem in durability. b. The amount of air taken in is determined by the volume of the combustion chamber 1a × frequency (acoustic characteristics of the combustion chamber 1a), and the amount of fuel that can be injected is determined by the amount of air, so the amount of combustion cannot be changed in a wide range. That is, it cannot cope with load fluctuations. c. In the case of pulse combustion, the air ratio is as narrow as 0.9 to 1.5. Therefore, the combustion gas temperature cannot be adjusted while changing the air ratio in a wide range according to the material to be dried.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and the constitution thereof is as follows. Forming a tail pipe on the downstream side of the combustion chamber,
A large number of air inflow holes are formed in the body, and a flame stabilizer with the tail pipe side opened is incorporated in the combustion chamber, the fuel supply port is connected to the flame stabilizer, and the combustion air supply port is burned. An oscillating combustion drying device, characterized in that it is connected to a chamber, and the material to be dried is positioned on the combustion gas injection side of the tail pipe.

[0005]

The gas or liquid fuel as the fuel is supplied to the combustion chamber via the flame stabilizer, and the air required for combustion is supplied to the combustion chamber by the blower and mixed, and is supplied by the spark plug or pilot burner. Ignition is performed and combustion is started. This combustion causes combustion noise in a wide frequency range, which resonates with the combustion chamber and the tail pipe, so that only the frequency corresponding to its natural frequency is amplified. As a result, oscillatory combustion is induced, resulting in pressure fluctuations within the combustion chamber. This pressure fluctuation is fed back to the upstream side, resulting in pressure fluctuations of air and fuel, and a circulation path is formed in which this is increased by combustion,
Stable oscillatory combustion continues. Due to the pressure fluctuation due to the oscillating combustion, a wave phenomenon occurs in the combustion gas injected from the tail pipe, and this wave phenomenon becomes a high temperature pressure wave to efficiently dry the material to be dried. Further, since the air is introduced stepwise in the flame stabilizer, the air ratio changes stepwise from the gas inflow side to the fuel rich to the air rich. Therefore, even if the mixing ratio of the gas to be supplied and the air, that is, the air ratio is widely changed, there is always an air-fuel mixture that can be combusted satisfactorily. Further, even if the fuel amount is changed, stable combustion can be performed for the same reason, and a wide range of load fluctuations can be dealt with.

[0006]

Embodiments of the present invention will be described with reference to FIGS. 1 and 2. Reference numeral 20 is a combustion chamber, 21 is a tail pipe, and 22 is a flame stabilizer incorporated in the combustion chamber 20. This flame stabilizer 22 opens the tail pipe 21 side and a large amount of air flows into the body portion 23. This is a configuration in which the holes 24 are provided. Reference numeral 25 is a fuel supply port connected to the flame stabilizer 22, and the fuel is ejected from the supply port 25 into the flame stabilizer 22 through the ejection hole 26. Reference numeral 27 denotes a combustion air supply port connected to the rear of the flame stabilizer 22 in the combustion chamber 20, and air is supplied by a blower 28.

In the case of the above embodiment, the fuel (gas) is supplied from the fuel supply port 25 into the flame stabilizer 22. On the other hand, air is supplied into the combustion chamber 20 through the air supply port 27, and this air enters the flame stabilizer 22 through the air inflow hole 24 of the flame stabilizer 22 where it is mixed with fuel and is mixed with the spark plug or pilot. The burner ignites and burns. The combustion gas is jetted from the tail pipe 21 and heats and dries the article 8 to be dried supplied from the hopper 7.

In the above combustion, combustion noise is generated in the flame stabilizer 22, the noise resonates with the combustion chamber 20 and the tail pipe 21, and only the frequency corresponding to the natural frequency is amplified. Due to this amplification, the combustion gas becomes a high temperature pressure wave and is jetted from the tail pipe 21 to heat and dry the material 8 to be dried.

[0009]

The effects of the present invention are as follows. a. Since the flame stabilizer is built in the combustion chamber and combustion is performed in the flame stabilizer, the combustion noise resonates with the combustion chamber and the tail pipe, and is further amplified. As a result, the high temperature pressure wave (vibration) can be efficiently generated. Therefore, the drying efficiency is good. b. Since the object to be heated does not come into contact with an open flame and is dried instantaneously, the modification of the object to be heated by heat can be reduced. c. Since the flame stabilizer stabilizes the flame, it can be used in a wide turndown and air ratio range. d. Since the combustion can be performed in a wide air ratio range, the temperature of the combustion gas can be adjusted according to the object to be heated. e. It is possible to control the combustion amount in a wide range according to the amount of the object to be heated and the water content. f. No need for a flapper valve, so durability is not an issue. g. Ordinary combustion equipment (blower, combustion control, piping system) can be used.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA ′.

FIG. 3 is an explanatory diagram of a drying device using a pulse combustion method.

[Explanation of symbols]

 20 Combustion Chamber 21 Tail Pipe 22 Flame Holder 23 Body 24 Air Inlet Hole 25 Fuel Supply Port 26 Jet Hole 27 Air Supply Port 28 Blower 7 Hopper 8 Dried Material

Claims (1)

[Claims] 1. A tail pipe is formed on the downstream side of the combustion chamber, a plurality of air inflow holes are formed on the body, and a flame stabilizer with the tail pipe side opened is incorporated in the combustion chamber. , A fuel supply port is connected to a flame stabilizer, a combustion air supply port is connected to a combustion chamber, and an object to be dried is located on the combustion gas injection side of the tail pipe. apparatus.