JPS5826912A - Combustor - Google Patents

Abstract

PURPOSE:To contrive reduction of NOx, by providing a combustion plate which performs combustion on its surface and is made of a porous sintered body on an opening part of a mixing chamber. CONSTITUTION:Heated and evaporated liquid fuel is gathered to a throttle nozzle 8A of a throttle plate 8 while mixing with surrounding combustion air, unification of density of mixture gas is contrived and the mixture gas is injected through the throttle nozzle 8A of the throttle plate 8. The mixture gas of the liquid fuel and the combustion air reaches the external surface of the combustion plate 9 through very small labyrinthine ventilating holes, which burns at a red heat on the whole surface of the combustion plate 9 so that the whole surface is enclosed, as the combustion plate 9 is formed of a porous sintered body, such as ceramic body like a hardened sponge, and very small and complicated libyrinthine ventilating holes are provided as a flame opening from the surface of a mixing chamber side to the external surface.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combustion device, and particularly to a novel combustion plate structure.

In a combustion device of the type that mixes fuel and combustion air to form a mixed gas and combusts this mixed gas, a flame port is formed between the combustion plate and the vaporization tube or on the combustion plate itself, and this It is common to eject a mixed gas from a flame port to burn it.

However, in such combustion equipment, a large amount of NOx is generated due to the high flame temperature, and if the combustion equipment is an open type, the NOx will be released into the room, which is bad for health, and the combustion equipment If it is a closed type, the NOx will be released outdoors and cause pollution.

For this reason, the combustion plate is made of a sintered body without two ventilation holes, and is generally called a flat plate-shaped seapunk plate, which has many small linear flame ports from the mixing chamber side surface to the outer surface. This reduces NOx by increasing the contact area between the flame and the Schbank plate and lowering the flame temperature.
It is also well known that the

However, even when using a Schbank plate, there is a limit to the number of small flame ports that can be formed, so it is difficult to achieve lower IJOx compared to those formed between the combustion plate and the vaporizing tube. No, it wasn't enough.

This invention was made in view of the above-mentioned drawbacks and aims to provide a combustion device that can significantly reduce NOx by using a new combustion plate.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

In addition, this embodiment describes an embodiment in which a combustion device according to the present invention is incorporated into a hot air heater.

That is, in Figures 2 and 3, (1) has a hot air outlet (IA) at the upper front and an intake hole (IB) at the upper back.
(2) is a box body (, 1, 1 air intake hole (1B
) The blower installed in the section draws indoor air into the intake hole (1B).
The hot air outlet (1)
It blows air to the A) side. (3) is the combustion plate (9) of the combustor (5) in the combustion device (A) to be described later, in other words, the transparent heat-resistant glass provided on the front part of the box facing the flame; (A) is It is a combustion device built into the lower part of the box (11), and its detailed structure will be described later using Fig. 1.
4) is a hollow cylindrical reflector with a mirror-like inner surface, which is provided to surround the combustion plate (9) of the combustion device (A).The part facing the heat-resistant glass (3) is cut out, and a window is provided in this part. A section (4A) is formed.

Fig. 1 shows the detailed structure of the above-mentioned combustion device. In Fig. 9, (5) is the combustor, (6) is the cylindrical vaporization cylinder forming the mixing chamber (6A), and (7) is the vaporization cylinder (6). A preheating heater (8) embedded in the wall is a diaphragm plate provided at the upper opening of the vaporizing cylinder (6), and has a diaphragm hole (8A) in the center. (9)
is a substantially hollow conical combustion plate disposed at the upper opening of the mixing M (6A), that is, at the one-way opening of the vaporization tube (61), and is connected to the above-mentioned vaporization tube (6), heater (7), and aperture. Together with the plate (8), it constitutes a combustor (5).

The combustion plate (9) is made of a porous sintered body such as a ceramic made of hardened sponge, and has a linear flame port from the mixing chamber side surface to the outer surface like a conventional combustion plate. is not present, and t# is present in the body itself. A labyrinth of extremely small ventilation holes that run intricately from the mixing chamber side surface to the outside surface are used as flame ports.

In addition, (II is a vaporizer cylinder (6A) with one end facing into the mixing chamber (6A).
6) Nozzle connected to the wall, (Iυ is the air volume control valve t connected to this nozzle OG, Q3 is the combustion air blower connected to the air pipe (lυ, 0 is the nozzle k, and coaxially installed inside Qe. one end is connected to the combustor (5) of nozzle QQ.
) side opening into the mixing chamber (6A), and the other end is connected to one end of an orifice pipe ae to be described later. ``a'' is an oil level regulator that supplies a predetermined amount of liquid fuel to be supplied to the combustor (5), and an oil reservoir is formed inside by a partition (15A). Qe is an orifice pipe whose one end is immersed in the oil reservoir of the oil level regulator a'J and whose other end is connected to the needle a bottle as described above.

On is a static pressure return pipe, one end of which extends upward within the oil level regulator 1IcJ, and the other end connected to the air pipe αυ.

Ol is the oil pipe, and one end is the oil level regulator a! The other end is connected to the bottom of the oil reservoir 9, and the other end is connected to the bottom of the sub-tank a9.

■ is an electromagnetic pump for oil transfer installed in the middle of the oil transfer pipe α,
0υ is an overflow pipe whose other end is connected to the bottom of the oil level regulator α9 other than the oil sump, and the other end is connected to the oil feed pipe Q8. 0υ is the cartridge tank that holds liquid fuel, and the subtank 0
is placed on top.

The combustion device is configured as described above.

Next, to explain the operation of this device, first, turn on the power switch (not shown), energize the heater (7), and preheat the wall of the vaporizer cylinder (6) to the temperature required to vaporize the liquid fuel. . When preheating is completed, the blower 0 is driven to blow air into the oil level regulator aS through the air pipe αυ and the static pressure return pipe αD.

The combustion air blown into the air pipe 0υ is injected into the mixing chamber (6A) through the nozzle Q (I).Meanwhile, the electromagnetic pump ω is also driven, and the liquid fuel stored in the sub tank 0 is transferred from the tank (2). The liquid fuel is supplied to the oil sump in the oil level regulator Qe9 through the oil supply pipe as.The liquid fuel supplied to the oil sump return part in the oil level regulator α When the amount exceeds ', it overflows and returns to the oil feed pipe αe through the overflow pipe Q0, where it is pumped up again by the 'as pump ■, and the fuel consumed by combustion, which will be described later, is supplied from the tank @ to keep the oil level constant.

At this time, air is blown into the oil level regulator uS through the static pressure return pipe (17+), so this air causes pressure (P) on the oil level.
The liquid fuel is supplied to the needle 0 through the orifice pipe Oe. Since combustion air is ejected from the nozzle αe, the liquid fuel supplied to the needle I is atomized by the shear force of this air flow, mixes with the combustion air, and spreads into a 1-yen silver shape while flowing into the vaporization tube (6 ) It collides with the inner wall and is vaporized.

The heated and vaporized liquid fuel enters the throttle hole (8A) of the throttle plate (8) while mixing with the surrounding combustion air, and the mixture concentration is made uniform.
) is ejected from the throttle hole (8A).

At this time, in this invention, as mentioned above, the combustion plate (
9) is made of a porous sintered body such as ceramic, similar to a hardened sponge.

Unlike conventional combustion plates, there is no linear flame port from the mixing chamber side surface to the outer surface, but there is one in the sintered body itself. Since the labyrinth-like extremely small ventilation holes intricately extending from the mixing M side surface to the outer surface are used as flame ports, the mixed gas of liquid fuel and combustion air or the labyrinth-like extremely small ventilation holes described above are used. It reaches the outer surface of the combustion plate (9), is ignited by a predetermined ignition means, and burns red-hot so as to enclose the entire surface of the combustion plate (9).

Therefore, the contact area between the combustion plate (9) and the flame is greatly increased compared to the case where a conventional schbank plate is used, and the flame temperature is lowered, thereby significantly reducing NOx. Also, the combustion plate (9
) becomes red hot due to combustion, and a large amount of infrared rays are emitted from the surface.

The apparatus according to the present invention operates as described above.

The heat generated by this combustion is blown out from the hot air outlet (1A) by the air sent by the blower (2) as shown in Figures 2 and 3, and is also reflected around the combustor (5). It is reflected by the plate (4) and the window part (4) of the reflecting plate (4)
A) and is emitted to the outside through transparent glass +31 to heat the room. Furthermore, in the above embodiment, the combustion plate (9) is used in order to greatly increase the contact area between the flame and the combustion plate (9), and to increase the combustion area within a limited space. Although it is assumed that the container is shaped like a container, it goes without saying that it may be shaped like a flat plate or the like. Further, the fuel may be gas fuel instead of liquid fuel.

As described above, according to the present invention, since the combustion plate made of a porous sintered body and which burns on nine surfaces is provided at the opening of the mixing chamber, the contact area between the flame and the combustion plate is greatly increased. , it is possible to significantly reduce NOx compared to conventional products.

[Brief explanation of the drawing]

FIG. 1 shows an apparatus according to an embodiment of the present invention.
-m line sectional view. Note that the same symbols in the figures indicate the same parts, and (5) is the combustor;
(6) is a carburetor cylinder* (6A) is a mixing chamber, and (9) is a combustion plate. Agent Makoto Kuzuno - s2 diagram■ 113 diagram/2

Claims (1)

[Claims] (1) A combustion device in which a combustion plate made of a porous sintered body is provided at the opening of a mixing chamber that mixes fuel and combustion air, and burns the mixed gas ejected from the pores on its surface. . (21 Combustion plate is characterized in that it is container-shaped.Claim 2). Combustion device as described.