JPH0583803B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides air supply and exhaust air inside a straight-tube combustion chamber.
This invention relates to a combustion type propagation combustion device in which the flame front propagates by continuously repeating the cycle of ignition, combustion, and extinguishing.

[Conventional technology]

Conventional propagation combustion devices of this kind, for example, as shown in FIG. A mixing chamber 7' is provided on the upstream side of the constricted part 6', and an ignition heater 8' is provided at the tip ignition part A', and an exhaust gas is provided on the downstream side of the ignition heater 8'. The pipe 2' is provided in communication with the straight-tubular combustion chamber 1', and the gas nozzle 9' faces the base end mixing chamber 7'.

[Problem to be solved by the invention]

The propagation combustion device uses a combustion method in which the cycle of air supply and exhaust, ignition, combustion, and extinguishing is continuously repeated in the straight-tubular combustion chamber, and the flame front propagates in each cycle. A very small amount of unburned gas may remain at both ends of the tip ignition part A' and the proximal extinguishing part B' during ignition and extinguishment. However, in the above-mentioned conventional propagation combustion equipment, no measures are taken to treat residual unburned gas, etc., so the combustion exhaust gas released from the exhaust pipe 2' to the outside contains toxic gases such as unburned gas. There was a problem.

In view of this problem, the present invention aims to clean the exhaust gas by injecting air again into the unburned gas, etc., when the unburned gas, etc. contained in the combustion exhaust gas is burned in an afterburner and released outside the device. The object of the present invention is to provide a propagation combustion device that allows mixing and complete combustion.

[Means to solve the problem]

In order to achieve the above object, the propagation combustion device according to the present invention has air supply and exhaust air in a straight pipe combustion chamber.
In a combustion type propagation combustor in which the flame front propagates by continuously repeating cycles of ignition, combustion, and extinguishing, an exhaust combustion section is provided with an air intake port in the exhaust section communicating with the straight pipe combustion chamber, An afterburner is installed on the downstream side of the air intake port of the exhaust combustion section to mix air with unburned gas, etc. contained in the combustion exhaust gas, and then combust and exhaust the mixture. Incidentally, as the afterburner, a surface combustion type radiation burner is suitable, but it goes without saying that a Bunsen burner may also be used. Note that the term "straight tubular combustion chamber" as used herein means a continuous tubular combustion chamber, and of course includes one having a bend or the like in the middle.

[Effect]

The propagation combustion device of the present invention configured as described above continuously repeats the cycles of air supply and exhaust, ignition, combustion, and extinguishing, and the air supply operation in the next cycle uses the combustion exhaust gas of the previous cycle. The exhaust gas is pushed out from the combustion chamber to the exhaust section, and the exhaust section is provided with an exhaust combustion section equipped with an air intake port, and an afterburner is installed in the exhaust combustion section, so that the combustion exhaust gas is pushed out to the exhaust section. The air from the air intake port is mixed with the gas again, and when it passes through the exhaust combustion section, it is combusted by the afterburner, which is constantly burning during operation, so that unburned gas, etc. contained in the combustion exhaust gas is less likely to be burned out. Complete and clean exhaust can be achieved. Therefore, exhaust gas containing toxic gases such as carbon monoxide is not released outside the device.

〔Example〕

Embodiments of the propagation combustion apparatus according to the present invention will be described below with reference to the drawings.

In Figures 1 to 3, 1 is a straight pipe-shaped combustion chamber, and the upstream side thereof, that is, the base end extinguishing part B
A constricted portion 6 is integrally formed by squeezing process to rapidly change the flow velocity of the flame flow during extinguishing to create a barrier and ensure extinguishment, and a mixing chamber 7 is provided on the upstream side of the constricted portion 6. are continuously expanded and formed. 2 is the straight tubular combustion chamber 1;
In other words, an afterburner 5 is installed on the downstream side of the air intake 3 of the exhaust combustion section 4, which is equipped with an air intake 3, in an exhaust section that is connected to the tip. As the afterburner 5, a surface combustion type radiation burner may be used as in the embodiment, or a Bunsen burner may be used. Then, a plurality of burners are installed at equal intervals around the circumference,
Radiant heat, flame, etc. from each burner are heated toward the center of the exhaust combustion chamber 4 to evenly burn the passing exhaust gas. Note that the afterburner 5 is ignited using an ignition means (not shown) such as an igniter or a nichrome wire. Reference numeral 8 denotes an ignition heater installed on the downstream side of the straight-tubular combustion chamber 1, that is, at the tip ignition site A. For example, as in the embodiment, an ignition source such as a nichrome wire is connected to a power source E via a switch S. etc. are used. Reference numeral 9 denotes a gas nozzle that faces the proximal end mixing chamber 7 with a primary air intake opening 10 around it.

Propagation combustion equipment consists of air supply and exhaust, ignition, combustion,
The extinguishing cycle is repeated continuously, and each part of the combustion chamber 1 is heated evenly by the flame front propagating inside the combustion chamber 1 for each cycle, so the heat is radiated evenly to each part, and heating is uneven. Coupled with its extremely high thermal efficiency, it is extremely useful when used as a heating source for various gas-burning equipment, such as snow melting equipment for roads in cold regions or commercial fryers. However, the combustion mechanism is that the fuel gas from the gas nozzle 9 and the primary air from the primary air intake opening 10 are mixed in the mixing chamber 7, and the mixture is directly passed from the mixing chamber 7 through the constriction 6. The air-fuel mixture is supplied into the tubular combustion chamber 1, flows from the upstream side to the downstream side within the combustion chamber 1 (see dotted arrow b in the figure), and when its tip reaches near the tip ignition site A, This is ignited by an ignition heater 8 installed next to it. When the tip of the mixture is ignited, the mixture starts to burn from the tip and the flame flow flows into combustion chamber 1.
flows from the downstream side to the upstream side (as shown by the solid line arrow a)
), flame propagation combustion is performed to uniformly heat all parts of the combustion chamber 1. When the end of the flame flow reaches near the narrowed part 6 of the proximal extinguishing part B, the narrowed part 6
This creates a shield wall to dam the flame flow and causes a sudden change in its flow velocity, so the extinguishment is carried out smoothly and reliably.Then the next cycle is started, and the combustion exhaust gas in the combustion chamber 1 is suppressed by the air supply operation. The flame propagation combustion operation of pushing out the gas toward the downstream side and discharging it outside the vessel from the exhaust section 2 is continuously repeated.

In the above flame propagation combustion operation, experiments have shown that, for example, when the length of the straight tube combustion chamber 1 is 10 m, one cycle of air supply, exhaust, ignition, combustion, and extinguishing takes approximately 30 to 60 seconds. If the input is 1000Kca/h, the temperature will be approximately 100℃ to 120℃.
A heating temperature of 100% was obtained equally from each part of the combustion chamber 1.

In the flame propagation combustion operation by continuously repeating the cycles of air supply, simultaneous exhaust, ignition, combustion, and extinguishing, the air-fuel mixture in the next cycle is transferred to the combustion chamber 1.
During the air supply operation, the combustion exhaust gas from the previous cycle is pushed out by the air supply and released from the exhaust section 2 to the outside of the device.In this invention, the exhaust section 2 is equipped with an air intake port 3. Since the combustion section 4 is provided and the afterburner 5 is installed in the exhaust combustion section 4, when the combustion exhaust gas reaches the exhaust section 2, the air from the air intake port 3 is mixed with the combustion exhaust gas again, and the exhaust combustion section 4, the afterburner 5 burns out the unburned gas contained in the combustion exhaust gas more completely. As a result, exhaust gas containing toxic gases such as carbon monoxide will not be released outside the device, and the exhaust gas will be clean.

〔Effect of the invention〕

Since the present invention is configured as described above, it produces the effects described below.

Combustion exhaust gas containing residual unburned gas peculiar to propagation combustion is mixed with air again at the time of release and burned by the afterburner, so its combustion efficiency is dramatically improved. Therefore, the unburned gas contained in the combustion exhaust gas is more completely burnt out, making the exhaust cleaner and eliminating the risk of carbon monoxide poisoning. Since complete combustion does not occur at all, the safety in use is doubled in combination with the cleaner exhaust gas. Furthermore, by taking advantage of these characteristics, it is ideal for road snow melting equipment, commercial fryers, greenhouse cultivation, etc.

[Brief explanation of the drawing]

Fig. 1 is an overall sectional view showing an embodiment of the propagation combustion device according to the present invention, Fig. 2 is an enlarged sectional view of the main part, and Fig. 3 is a partially cutaway sectional view taken along the line X-X in Fig. 2. , FIG. 4 is an overall sectional view of a conventional example. 1... Straight tubular combustion chamber, 2... Exhaust section, 3... Air intake port, 4... Exhaust combustion section, 5... Afterburner.

Claims (1)

[Claims] 1 In a combustion type propagation combustion device in which the flame front propagates by continuously repeating the cycle of air supply and exhaust, ignition, combustion, and extinguishing within the straight-tubular combustion chamber 1, the exhaust gas that communicates with the straight-tubular combustion chamber 1 An exhaust combustion section 4 equipped with an air intake port 3 is provided in the section 2, and an afterburner 5 is installed in the exhaust combustion section 4 to mix air with unburned gas, etc. contained in the combustion exhaust gas, and to combust and discharge the mixture. A propagation combustion device characterized by: