JPH0237203A - Liquid fuel combustor - Google Patents

Abstract

PURPOSE:To make it possible to miniaturize and to surely mix fuel gas with air by a structure wherein a diffuser panel having a structure which makes the flow of gasified fuel once turn back in the direction of a mixing tube and, after that, spread to the outer peripheral part of a straightening vane, is provided between the mixing tube and the straightening vane. CONSTITUTION:The liquid fuel combustor concerned 10 consists of a nozzle 12 to jet vaporized fuel, a mixing tube 16 to mix the vaporized fuel with air, a straightening vane 20 to straighten the flow of said mixture and a flame port plate 21, all of which are arranged coaxially, and a diffuser panel 22 having a structure which makes the flow of gasified fuel once turn back in the direction of the mixing tube 16 and, after that, spread to the outer peripheral part of the straightening vane 20 and being provided between the mixing tube 16 and the straightening vane 20. Under the above-mentioned constitution, the mixing of fuel gas and air entering the mixing tube 16 is accelerated and the sure mixing of the fuel gas and the air can be realized by means of a diffuser panel 22, which is provided between the mixing tube 16 and the straightening vane 20. Further, mixing distance can be reduced due to the diffuser panel 22, resulting in allowing to make a combustor main body thinner and smaller.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a combustor that gasifies and burns liquid fuel.

(Prior Art) Conventionally, hot-air heaters that perform heating by circulating warm air indoors have been well-received as clean and comfortable heaters. This type of hot air heater takes in air for combustion from outside using a fan and releases it outside. On the other hand, indoor air can be heated without polluting the indoor air because combustion heat is extracted through a heat exchanger. However, recently, due to accidents caused by exhaust pipes coming loose, regulations regarding exhaust gas have changed to indoor open type combustors. In addition, in order to improve usability, the heating power adjustment range has been widened, allowing for good combustion characteristics over a wide range, such as high-calorie operation at the beginning of heating, and low-calorie operation once the room has warmed up. A combustor is required.

A vaporizing Bunsen burner is used as a combustor that meets the above requirements. This vaporizing Bunsen burner (atmospheric pressure burner) has the primary air intake port and secondary air intake port at atmospheric pressure, and the fuel injection nozzle blows primary air with an ejector effect to reduce the internal pressure of the burner. A mixture of fuel and air is blown out from the high flame port.

At the point where the blowing speed and combustion speed are balanced, a reaction occurs in the air-fuel mixture and a flame is formed. When this evaporative Bunsen burner is incorporated into a hot air heater, the high temperature heat generated by the flame is exchanged with a heat exchanger, and warm air is sent into the room using a fan or the like to heat the room.

However, in the case of a hot air heater that incorporates an evaporative Bunsen burner, the Bunsen burner is built into a sealed container, so the temperature inside the sealed container changes due to combustion in the burner, and this temperature becomes high. As the temperature increases, the combustion rate increases. As the combustion speed increased, the balance of flame formation was disrupted, causing backfire. In addition, since air convects within the burner, the temperature near the nozzle increases and there is a risk of ignition near the nozzle. Therefore, one possible method is to install a partition plate on the burner to prevent air convection and partition the flame nozzle and nozzle to prevent the temperature from rising at the nozzle. It became difficult to suck in primary air at the nozzle, and the ratio of primary air to secondary air changed, resulting in an imbalance and backfire.

In addition, from the perspective of space saving, there is a demand for thin combustion equipment, and although combustion equipment using conventional Bunsen burners can be made thin, the combustion equipment becomes horizontally long, making it difficult to install it in homes. This caused a problem.

(Problems to be Solved by the Invention) As described above, in a combustion device using a conventional Bunsen burner, combustion is performed in a closed container, so the supply balance of combustion air is lost, and the temperature inside the closed container becomes high, causing the combustion speed to increase. However, due to changes, backfires were occurring. Also, from the perspective of space saving, it was possible to make it thin, but it caused problems when considering the installation space in a landscaped garden.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a small liquid fuel combustor that reliably mixes fuel gas and air and prevents flashback.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the liquid fuel combustor of the present invention has the following features:
A nozzle for ejecting vaporized fuel, a mixing tube for mixing the vaporized fuel and air, a rectifying plate for rectifying this mixture, and a flame port plate are arranged coaxially, and the mixing tube and the rectifying plate are arranged coaxially. In the meantime, the flow of gasified fuel is once reversed in the direction of the mixing pipe, and then the flow of the gasified fuel is reversed toward the mixing pipe. It is characterized by having a diffuser plate that extends to the outer periphery of the I-flow plate.

(Function) In the device configured in this way, the diffusion plate provided between the mixing tube and the rectifying plate promotes mixing of the fuel gas and air entering the mixing tube (ζ), and ensures reliable fuel gas. It becomes possible to mix air. Also, the mixing distance can be shortened by the diffusion plate, and the combustor main body can be made thinner and smaller.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram of a combustion apparatus incorporating a liquid fuel combustor according to an embodiment of the present invention. In the figure, a combustion device main body 1 is fixed to the surface of a wall 2 via a metal fitting 3. This combustion device main body 1 includes an auxiliary tank 5 for storing liquid fuel in the combustion device main body 1 from a fuel tank 4 outside the combustion device main body 1, and a pumping tank 5 for supplying liquid fuel from the fuel tank 4 to this auxiliary tank 5. A pump 6 is provided, and the pump 6 and the fuel tank 4 are connected through a fuel vibrator 7.

The liquid fuel in the auxiliary tank 5 is sent to a vaporizer 9I by the main fuel pump 8, and the vaporizer 9 gasifies the liquid fuel 50 and sends it to a liquid fuel combustor (burner) 10.

Next, the liquid fuel combustor 10 will be explained. I@
FIG. 2 is a plan view showing the configuration of a liquid fuel combustor according to an embodiment of the present invention. In FIG. 1, liquid fuel combustion is covered with a burner case 11, and a nozzle 12 for spouting vaporized fuel sent from a vaporizer 9 is attached to a flange portion 14ζ of a nozzle holder 13. . Coaxially with this nozzle 12, a mixing pipe 16 for mixing secondary air taken in from an air intake port 15 and vaporized fuel ejected from the nozzle 12 is fixed to an inner cylinder 19 by partition plates 17 and 18. Furthermore, on the coaxial downstream side of the nozzle 12, there is a rectifying plate 20 for rectifying the air-fuel mixture mixed from the mixing tube 16J. A flame outlet plate 21 is installed downstream of this current plate 2°. Between the mixing tube 16 and the rectifying plate 20 ζ is a diffusion plate 22 having a structure in which the flow of the air-fuel mixture is once reversed in the direction of the mixing tube 16 and then spread to the outer periphery of the rectifying plate 20.
is installed. This diffuser plate 22 is the rectifier plate 201
The rectifier plate 20 is
(This is fixed. Also, the flame outlet plate 21J is the flame outlet 23.
A plurality of flame ports 23 are provided, and the shape of the flame ports 23 is as shown in FIG. It may be a slit type or one using a net. This burner port plate 21 is integrated with the inner cylinder 19.

Between the inner cylinder 19 and the burner case 11, there are formed a primary air passage 24 that sends air taken in from the air intake port 15 to the mixing tube 16 side, and a secondary air passage 25 that sends the air to the flame port plate 21 side. There is. An adjustment plate 27 having an adjustment hole 26 for adjusting the amount of air sent to the flame port plate 21 side is provided on the secondary air passage 25 side. Combustion air taken into the air intake port 15 is configured to flow into the secondary air passage 24 and the secondary air passage 25 by a fan (not shown).

Next, the operation according to an embodiment of the present invention in the above configuration will be explained. To use this combustion device, when a switch (not shown) is turned on, if the auxiliary tank 5 does not have the required amount of liquid fuel, the pump 6 is activated and the liquid fuel in the fuel tank 4 is pumped into the auxiliary tank 5 through the fuel pipe 7. . When there is more liquid fuel in the auxiliary tank 5 than the required amount, the main fuel pump 8 is activated to send the liquid fuel in the auxiliary tank 5 to the vaporizer 91. A vaporizer 9 gasifies the liquid fuel into vaporized fuel, which is then flowed into a nozzle 12. The vaporized fuel guided to the nozzle 12 is injected into the mixing pipe 16 from a nozzle hole of a liquid fuel combustor (burner). Due to the ejector effect caused by the jetting force of this vaporized fuel from the nozzle 12, secondary air (dotted line in the figure) is sucked from the air intake port 15 through the primary air passage 24, and is mixed with vaporized fuel in the mixing pipe I6. The primary air is mixed to form a mixture (solid line in the figure). This air-fuel mixture flows as shown by the solid line in FIG. 4, which is a detailed sectional view of a liquid fuel combustor according to an embodiment of the present invention. In other words, the mixture coming out of the mixing tube 16 is mixed w1
6 and the rectifier plate 20, the flow flows to the surrounding area of this diffuser plate 22, and then flows backwards to the side of the partition plate 18 in the direction of the mixing tube 16, and is rectified again by the partition plate 18. toward the outer periphery of the plate 2o. This operation promotes the mixing of the vaporized fuel and the primary air mixture, and ensures reliable mixing. This air-fuel mixture flows to the flame port 23 of the flame port plate 21 and is ignited by an ignition device (not shown) on the downstream side of the flame port plate 21 to form a flame (-secondary flame). Then, this secondary flame flows from the air intake 15 to the adjustment plate 27 of the secondary air passage 25 at y4! It is mixed with secondary air (dotted chain line in the figure) taken in through the a-hole 26, and combustion occurs.

Of course, this v! The adjustment holes 26 of the four straightening plates 27 are linked to a combustion force control switch (temperature control switch, etc.) and are controlled so as to supply the amount of air as required.

It is mixed with secondary air and combusted, and the heat generated by this combustion is exchanged with a heat exchanger (not shown), and hot air is supplied indoors by a fan or the like.

In the above case, the provision of the diffuser plate 22 not only promotes mixing, but also shortens the distance required for mixing, making it possible to make the combustor body pan more compact. In addition, the gas concentration and amount of the mixture to the outer periphery of the rectifier plate 2o can be made uniform by causing the mixture to flow backwards once through the diffusion plate 22 and flowing toward the outer periphery of the rectifier plate 2o again. be able to. Therefore, the flame formed on the flame port plate 21 is also formed in a well-balanced manner in the circumferential direction, so that good combustion characteristics can be obtained.

In addition, this combustion heat is mainly absorbed by the diffusion plate 22 through radiation and heat transfer.
The gas is then transmitted to the mixing tube 16 to reheat the gasified fuel, which prevents the fuel from recondensing. Since the fuel can be burned without producing red flame or drain, combustion can be achieved with high combustion efficiency.

Furthermore, uniform combustion in the circumferential direction is possible, the ratio of primary air and secondary air required according to the combustion capacity can be easily adjusted using the air adjustment adjustment plate 27, and the combustion chamber (flame port 2
3) and the mixing tube 16 are separated, and the area around the nozzle 12 is cooled by the air flowing through the secondary air passage 24 and the secondary air passage 25 (this structure prevents flame backfire. be able to.

〔Effect of the invention〕

According to the present invention, the diffusion plate provided between the mixing tube and the rectifier plate promotes the mixing of the fuel gas and air entering the mixing tube, and it is possible to ensure the mixing of the fuel gas and air. Furthermore, since the flame is also formed in a well-balanced manner in the local direction, good combustion characteristics can be obtained. Furthermore, the mixing distance can be shortened by the diffusion plate, and the combustor main body can be made thinner and smaller.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a combustion apparatus incorporating a liquid fuel combustor according to an embodiment of the present invention, FIG. 2 is a plan view showing the configuration of a liquid fuel combustor according to an embodiment of the present invention, and FIG. Figure (a)
and (b) is a plan view of a flame port plate of a liquid fuel combustor according to an embodiment of the present invention, and FIG. 4 is a sectional view of details of the liquid fuel combustor according to an embodiment of the present invention. 1...Combustion device main body 4...Fuel tank 5...Auxiliary tank 6...Sump pump 7...Fuel pipe 8...Main fuel pump 9...Carburizer 1
0...Liquid fuel combustor 11...Burner case 12
... Nozzle 16 ... Mixing tube 19 ... Inner cylinder 20 ... Straightening plate 21 ... Burner port plate 22 ...
Diffusion board 23... Inflame agent Patent attorney Nori Chika Ken Yudo Uji Hiroshi 4! ! Ki, Sea <eft) Kanade

Claims (1)

[Claims] A liquid fuel combustion device that gasifies and burns liquid fuel using a vaporizer, which includes: a nozzle that spouts the vaporized fuel; a mixing tube that mixes the vaporized fuel and air; a rectifying plate that rectifies the mixture; and a rectifying plate that rectifies the mixture. a flame port plate that forms a combustion flame is disposed coaxially, and between the mixing tube and the rectifying plate,
A liquid fuel combustor comprising a diffusion plate configured to once reverse the flow of gasified fuel in the direction of the mixing tube and then spread it to the outer periphery of the rectifying plate.