JPH01266408A - Flame propagating burner - Google Patents

Abstract

PURPOSE:To eliminate the dangers of carbon monoxide poisoning, etc., and raise safety in use by providing an after-burner near the ignition section at the tip end of a combustion chamber of straight tube shape and burning and discharging the unburned gas, etc., that are contained in the combustion discharge gas by means of the above after-burner. CONSTITUTION:An after-burner 2 is provided near the ignition section A at the tip end of a combustion chamber 1 of straight tube shape. In a flame propagation action in which air supplying, gas discharging, ignition, combustion, and fire extinguishing are continuously repeated, the discharged gas in combustion in the air preceding cycle is discharged out of the device from a discharge pipe 8 by pushing the discharged gas with the supply air during the air supplying action to supply a mixture gas into the combustion chamber 1 in the next cycle. With this arrangement uniform combustion is provided in the after-burner 2 so that unburned gas and so on that are contained in the discharged gas are completely burned.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is a combustion method in which the flame front propagates through a continuous cycle of supplying air (simultaneously exhausting air), ignition, combustion, and extinguishing in a straight-tubular combustion chamber. Method of propagation combustion! ! Regarding the location.

[Conventional technology]

A conventional combustion device of this kind is, for example, a 4th r.
As shown in A, a straight tubular combustion chamber (1).

At the proximal end extinguishing part (B)', a constricted part (3)" is provided for rapidly assimilating the flow velocity of the flame flow during extinguishing, and a mixing chamber (4)" is connected to the flow side of the constricted part (3)". The structure is such that an ignition heater (5)' is provided adjacently to the point-large portion (A)', and a gas nozzle (6)' faces the base end mixing chamber (4)'.

[Invention tries to solve! ! 1! Title] The transfer combustion device has 1 ■ air supply (simultaneously exhausting) inside the tubular combustion chamber, ignition, combustion,
J! the fire extinguishing cycle! ! Since this is a combustion method in which the flame front propagates continuously and repeatedly for each cycle, both ends of the front extinguisher large part (A)' and the base end extinguishing part (11)' of the straight tube-shaped combustion chamber (1)' When igniting and extinguishing a fire, a very small amount of unburned gas may remain in the area. However, in the above-mentioned conventional propagation combustion apparatus, no measures are taken to treat residual untwisted gas, etc., so the combustion exhaust gas discharged from the exhaust pipe (8) to the outside contains untwisted gas, etc. There was a problem that it contained poisonous gas.

In view of these problems, the present invention provides a 1 m2 combustion device that cleans the exhaust gas by burning the unburned gas contained in the combustion exhaust gas in an afterburner and releasing it outside the combustion exhaust gas. The purpose is

[Means to solve the problem]

In order to achieve the above object, the propagation combustion device according to the present invention uses a combustion method in which the flame front propagates by continuously repeating the cycles of air supply (simultaneously exhausting), ignition, combustion, and extinguishing in a straight pipe combustion chamber. In the propagation combustor, an afterburner is provided near the ignition site at the tip of the straight tube-shaped combustion chamber, and untwisted gas, etc. contained in the combustion exhaust gas is combusted by the afterburner and discharged. Note that a surface combustion type radiation burner is suitable as the afterburner.

Furthermore, the term "straight tubular combustion chamber" as used herein means a continuous tubular combustion chamber, even if there are bends or the like in the middle.

[Effect]

In the propagation combustion device of the present invention configured as described above, in the continuous repetition of the cycles of air supply and exhaust, ignition, combustion, and extinguishing, the air supply operation in the next cycle is used to remove the combustion exhaust gas from the previous cycle. However, when this combustion exhaust gas is released, it is burned in an afterburner that is constantly burning during operation, so that the untwisted gas, etc. contained in the combustion exhaust gas is completely burned out. Exhaust gas containing toxic gases such as carbon monoxide is not released to the outside, and the exhaust gas can be cleaned.

In the propagation combustion device of the present invention, the afterburner serves as a powerful ignition source to achieve complete ignition, so no separate ignition means such as an ignition heater is required.

〔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 a shielding wall is installed on the upstream side of the combustion chamber, that is, at the proximal extinguishing part (B), by rapidly changing the flow velocity of the flame flow during extinguishing. A constricted part (3) for ensuring fire extinguishment is integrally formed by squeezing, and a mixing chamber (4) is continuously expanded and formed on the upstream side of the constricted part (3). . (2) is an afterburner, and the straight tube-shaped combustion chamber (1)
It is installed on the downstream side of the combustion apparatus, that is, near the tip ignition site (A), and is ignited by an ignition means (not shown) such as an igniter or Nichrome IIA, and after ignition, it also serves as the ignition source for the combustion device. The afterburner (2) has a plurality of surface combustion type radiant burners installed at equal intervals on its circumference, and the radiant heat (infrared a) and flame from each radiant burner are directed to the center of the combustion chamber (1). The exhaust gas passing through the exhaust gas is heated evenly so that it is evenly combusted. (6) is a gas nozzle with a secondary air intake opening (7) surrounding the proximal mixing chamber (4), and (8) communicates with the tip of the straight combustion chamber (1). This is an exhaust pipe that can be formed.

Propagating combustion 1 [is a cycle of air supply and exhaust, ignition, combustion, and extinguishing that is repeated continuously, and each part of the combustion chamber (1) is Because it is heated evenly, the surface temperature is even on all parts, and there is no uneven heating.Coupled with its extremely high thermal efficiency, it can be used, for example, as a snow melting device for roads in cold regions or for commercial use. It is extremely useful when used as a heating source for various ffλm roasters for 7-layers, greenhouse cultivation, water ditch cultivation, etc., but its combustion mechanism is
Fuel gas from gas nozzle (6) and primary air intake opening (
- Large air from 7) is mixed in the mixing chamber (4), from which the air-fuel mixture is fed through the constriction (3) into the straight-tubular combustion chamber (1), and the air-fuel mixture is The flow inside the combustion chamber (1) from the upstream side to the downstream side (see the dotted line arrow (b) in the figure), and when the tip reaches near the tip ignition site <A>, the afterburner (which is constantly burning during operation) is activated. 2) ignites it. When the air-fuel mixture is ignited, the air-fuel mixture starts to burn from the tip side, and the flame flow flows from the downstream side to the upstream side in the combustion chamber (1) (see solid line arrow (a) in the figure), causing a flame propagation combustion operation. to heat all parts of the combustion chamber (1) evenly. The end of the flame flow above is the base! 4 Narrowing part (3) of extinguishing site (B)
), a barrier is created at the narrowed part (3) to dam the flame flow and cause a sudden change in the flow velocity, ensuring that the fire is extinguished, and the next cycle begins with the air supply operation. A flame propagation combustion operation is continuously repeated in which the combustion exhaust gas in the combustion chamber (1) is pushed downstream and released from the exhaust pipe (8).

In the above flame propagation combustion operation, experiments have shown that, for example, when the length of the straight pipe combustion chamber (1) is set to 10, one cycle of air supply and exhaust, ignition, combustion, and extinguishing takes about 30 seconds to 60 seconds. The input is 1000K
In the case of cajj/h, a heating temperature of approximately 100°C to 120°C was equally obtained from each part of the combustion chamber (1). In a flame propagation combustion operation in which the cycles of air supply and exhaust, ignition, combustion, and extinguishing are repeated continuously, the combustion during the previous cycle is performed during the air supply operation to supply the mixture in the next cycle to the combustion chamber (1). Push out the exhaust gas with the supplied air and exhaust 'ff(
8), but in this invention,
When the combustion exhaust gas is released, it is evenly burned in the afterburner (2) provided near the tip ignition point (A) of the combustion chamber (1), so that the unburned gas etc. contained in the combustion exhaust gas is completely removed. It will be burnt down. Therefore, exhaust gas containing toxic gases such as carbon oxide is not released outside the device,
This results in clean exhaust.

〔Effect of the invention〕

This invention has been developed as explained above, so
This produces the effects described below.

This is because when the combustion exhaust gas containing residual unburned gas, etc., which is characteristic of propagation combustion, is released, it passes through the radiant heat (infrared rays) etc. from the afterburner, completely burning out the unburned gas, etc. in the combustion exhaust gas. The exhaust gas becomes clean and there is no risk of carbon monoxide poisoning, improving the safety of use.

In addition, the afterburner doubles as a powerful ignition source, so the ignition is smooth,
Since complete ignition can be achieved, residual untwisted gas, etc. can be reduced, and the cycle of combustion of the flame body W1 can be stabilized, and the structure can be simplified because there is no need to separately provide ignition means such as an ignition heater. It can also be planned. Furthermore, by taking advantage of these features, it is ideal for road fusion devices, commercial 7-layers, greenhouse cultivation, etc.

[Brief explanation of the drawing]

Fig. 1 is an overall sectional view showing an embodiment of the W1 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 X-XIIA of Fig. PIIJ2.
FIG. 4 is an overall sectional view of a conventional example. (1)... Straight tubular combustion chamber, (2)... Afterburner, (A)... Tip ignition site.

Claims (1)

[Claims] In a combustion type propagation combustion device in which the flame front propagates by continuously repeating the cycle of supplying and exhausting air, ignition, combustion, and extinguishing in the straight-tubular combustion chamber (1), the straight-tubular combustion chamber (1)
There is an afterburner (2) near the tip ignition part (A) of 1).
1. A propagation combustion apparatus characterized in that a propagation combustion apparatus is provided with a combustion exhaust gas to combust and exhaust untwisted gas and the like contained in combustion exhaust gas.