JPH0311216A - Combustion device - Google Patents

Abstract

PURPOSE:To enable a radiant burner having a wide range of adjustability in heating power to be attained by a method wherein a circulating air flow is supplied to fuel injected from a perforated wall of a fuel nozzle which is concentrically arranged with a combustion pipe acting as a heat transmitting body and then a thin and long flame is formed along a unperforated wall formed on the downstream side of the perforated wall. CONSTITUTION:A combustion pipe 1 is constituted by a heat transmitting body such as a heat-resistance glass and a nozzle for injection of fuel is provided. The nozzle is concentrically inserted from one end of the combustion pipe 1. Fuel gas is injected from the nozzle 2, and air is supplied from the upstream side of the nozzle 2 as circulating air by an air blower 5 or the like through a circulating body 6 so as to contact with the flow of fuel gas and then ignited. At this time, gas is injected from a perforated wall 3 at an inlet side of the nozzle 2 and extended by the circulating air. Although the flame 9 is formed at the contact plane between the gas and the circulating air, the air may form a uniform and less-disturbed contact plane due to the circulation. In turn, since the unperforated wall 4 may form a thin and long flame along the wall, a flame size and a flame length can be controlled in response to its outer diameter.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a household combustor, which is used as a heating or drying heat source.

2. Description of the Related Art Conventionally, this type of combustor has an air swirling section 1 in a nozzle section 12 in a cylindrical combustion chamber 11, as shown in FIGS. 3(a) and 3(b).
3, which has a pre-mixing type diffusion combustor that violently mixes and burns the fuel and air ejected from the nozzle 12, or a diffusion combustor that premixes some air and ejects it from the nozzle, surrounding it with diffusion combustion air. There are combustors that supply and combust.

Problems to be Solved by the Invention These problems have been considered with the aim of how to mix and burn hot air and fuel r1.

That is, a long flame was undesirable and led to the generation of soot. Also, vigorous air and fuel mixing resulted in flame instability, and weakening the mixing resulted in the soot generation.

The radiant heat fi (burner) used was a full-order or high-order air combustion type burner, such as a bank bank type burner or a wire mesh type burner. These products can give you a beautiful red-hot surface, but they tend to cause backfire and have almost no firepower! ! ! !
I couldn't do ff. Others used a Bunsen burner to heat wire mesh or metal pieces placed above it. This type has a heating power of TE1, but the red-hot surface is narrow and CO is easily generated, so it has not been used recently.

As mentioned above, the object is to obtain a radiant burner that does not cause backfire and has a wide range of firepower adjustment, and is formed as a long radiator.

Means for Solving the Problems In order to solve the above problems, the combustor of the present invention comprises a long combustion tube, a fuel nozzle provided concentrically with the combustion tube, and a blower device provided on the upstream side of the combustion tube. , the combustion tube portion corresponding to the nozzle is constituted as a heat transmitting body, and the nozzle is formed into a cylindrical shape with a bottom end, the upstream portion inlet side thereof is formed as a porous wall, and the downstream portion is formed as a non-porous wall; The structure includes a swirling body that is provided upstream at a distance from the nozzle to give a swirling flow to the air from the blower and supply it to the combustion tube.

Operation The present invention has the above-described configuration, and by supplying air that swirls the fuel ejected from the perforated wall of the nozzle,
The nozzle surface is heated by forming a thin and long flame along the non-porous wall formed downstream of the perforated wall, thereby creating a uniform red-hot surface in the shape of a long cylinder. That is, the swirling air stretches the ejected fuel and makes the diffusion surface uniform, thereby forming a very long and thin flame on the nozzle surface in the combustion tube. This heats the nozzle surface and evens out the heat.
It can be made into a long radiant heating body with high properties.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. 1st
In the figure, reference numeral 1 denotes a combustion tube, which is partially or entirely made of a heat transmitting material such as heat-resistant glass. In this example, the whole is made of glass.

The length and diameter are determined depending on the purpose and amount of combustion, but according to experiments, the appropriate values are 1.0-100 mm in diameter and -200 mm in length. Reference numeral 2 consists of a cylinder shaped like a storage cylinder whose tip is closed with a fuel injection nozzle inserted concentrically from one end of the combustion tube l and somewhat shorter than the heat transmitting body. The inlet side of this cylinder is formed by a separate porous body 3a as in the other embodiment shown in FIG. 4, and an air swirling body 6 is provided upstream at a distance from the nozzle 2 to swirl the air from the air blower R5 or the like.

7 is a flame-holding plate provided on the perforated wall 3 near the inlet of the nozzle 20, 8 is a combustion vibrator for feeding fuel to the nozzle, and 9 is formed concentrically with the combustion tube and surrounding the nozzle 2. It is a long flame.

In the above configuration, fuel gas is ejected from the nozzle 2, and air is supplied from the blower 5 or the like as swirling air via the swirling body 6 from the upstream side of the nozzle 2 so as to be in contact with the flow of the fuel gas, and is ignited and burned. At this time, the gas is ejected from the perforated wall 3 on the inlet side of the nozzle 2 and is stretched by the swirling air. The flame 9 is formed at the contact surface between the gas and the swirling air. Due to the swirling, the air forms a uniform contact surface with little turbulence, and the flame is stretched (stretching effect) and formed thinly along the nozzle 2. Ru.

That is, the fuel gas ejected from the perforated wall 3 of the nozzle 2 is elongated under the influence of the swirling air, and is formed into a thin and long cylindrical shape along the non-perforated wall 4, heating the surface of the nozzle 2 to red heat. . Therefore, the longer the nozzle 2 is, the longer the flame 9 is formed along the outer diameter of the nozzle 2. It is sufficient to ensure the supply area, which is determined by the required amount of salt VL; if it is too large, gas will be ejected unevenly, and if it is too small, combustion noise will be produced and the flame will become unstable.

On the other hand, the non-porous wall 4 forms a thin and long flame along the wall surface and is heated to red heat by the flame, and the flame thickness can be set by the outer diameter and the flame length can also be controlled by the length.

Further, the flame thickness changes depending on the swirling strength of the swirling air, and the stronger the swirling, the thinner the flame is formed, and the thinner the flame thickness, the closer the flame is to the non-porous wall and the more intensely it is heated. In this way, by applying swirling air to the perforated wall part 3 and the non-perforated wall part 4 through the nozzle 2, a stable, thin and long flame with an arbitrary diameter and length can be formed, and a uniform and long flame can be formed. The flame cylinder-shaped red-hot surface changes.

To adjust the firepower, reduce the amount of gas, which will reduce the length of the flame that surrounds the nozzle and reduce the red-hot surface. In other words, since the heating method is similar to that using a Bunsen burner, the heating power can be adjusted over a wide range, and since the flame is constantly formed to wrap around the nozzle, there is no CO generation, and the heating power is great! JillIff changes the length of the flame and the length of the red-hot surface is also formed by that length. It becomes a radiator with a wide ff width. In our experiments, for example, the combustion tube diameter was 60 wm and the length was 500 mm.
, nozzle diameter 25mm, hole wall 20w5S non-porous wall <oo
m, the combustion amount is 1000-5000 kcal, and the red-hot surface length is 500-50 mm.

Even with such a length, no soot or CO is generated and a uniform red-hot surface can be obtained. Note that the strength of the swirling is desirably such that it does not disturb the gas jet flow.

Effects of the Invention As described above, according to the combustor of the present invention, by forming a long flame thinly in the tube along the nozzle surface, which was unthinkable in the past, the nozzle surface becomes red hot and a long cylindrical radiation is emitted. In addition to obtaining a combustor with a wide range of firepower adjustment, it provides a heater that can be used for many purposes such as space heating, drying, and oven heating.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of essential parts of a combustor in an embodiment of the present invention,
FIG. 2 is a sectional view of a nozzle portion showing this embodiment, and FIG. 3 is a sectional view of a burner portion of a conventional combustor. 1... Combustion tube (heat transmitting body), 2... Nozzle, 3... Perforated wall, 4... Non-porous wall,
5...Blower, 6...Air rotating body.

Claims (1)

[Claims] It consists of a long combustion tube, a fuel nozzle provided concentrically with the combustion tube, and an air blower provided on the upstream side of the combustion tube, and at least the combustion tube portion corresponding to the nozzle is configured as a heat transmitting body and the fuel nozzle is provided concentrically with the combustion tube. The nozzle has a cylindrical shape with a bottom end,
The inlet side of the upstream part is formed as a porous wall, and the trailing part is formed as a non-porous wall, and the swirling device is provided upstream at a distance from the nozzle to give a swirling flow to the air from the blower and supply it to the combustion pipe. A combustor with a body.