JPS60188718A - Burner - Google Patents

Abstract

PURPOSE:To provide the effective heating of the bottom wall of a gasification body with burnt exhaust gas, a stable gasification without any generation of tar and a saving of electrical energy by a method wherein the exhaust gas is contacted with the outer surface while being crossed at a right angle thereto and an exhaust gas discharging port is oppositely formed against the bottom wall. CONSTITUTION:In a home-use combustion device to be used in a heating equipment, a combustion unit 28 composed of metallic net or the like is located outside of a flow regulator 26 having several small holes 27, one end of the combustion body is cooperatively located at the upper end of the gasification body 15. The ignited discharging gas advances from between the combustion body 28 and the outer plate 29 into between the side wall of the gasification body 15 and the outer cylinder 19 and further passes through a passage 21 arranged below the bottom wall of the gasification body 15 and discharged out of the discharging port 20. During a process in which burnt discharging gas is flowed, the gas receives heat sufficiently at the side wall and the bottom part of the gasification body and even if an electric heater 16 is deenergized, it is possible to make a continuous gasification of fuel only with a feed-back of the combustion heat. In particular, the discharged gas is struck against the bottom part of the gasification body 15 in such a manner as it may be crossed at a right angle thereto, thereby the gas is concentrically heated and a high temperature of the gas can be kept, so that the stable gasification and a generation of tar can be restricted.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a combustion device mainly used in household heating equipment and the like.

Conventional configuration and its problems A typical example of a conventional combustion device is shown in FIG.

In FIG. 1, 1 is a vaporized body, which is preheated by an electric heater 2. 3 is a mixing plate, 4 is a flame hole body with a large number of slits formed therein, and 5 is no flame in premix combustion. 6 is the outer cylinder, 7
is a primary air blast pipe, 8 is a pipe, and 9 is a fuel pump. 1o is a secondary air blow pipe, and 11 is a blower. Reference numeral 12 denotes a cylinder that guides exhaust gas to the upper part, and a purification catalyst 13 having a large number of small holes 14 is installed at the upper end of the cylinder.

In this type of combustion device, the fuel discharged from the pipe 8 hits the side wall of the vaporizer 1 facing the pipe 8, flows to the bottom, and is vaporized there.

During steady combustion, the vaporized body 1 is heated by heat conduction from the flame hole body 4 to the vaporized body 1 and a part of the flame 6 is applied to the upper 1/1M of the vaporized body 1, and the electric heater 2 is energized. I'm trying to minimize it as much as possible.

However, as can be seen from FIG. 1, it is necessary to receive heat from the flame 6 and the flame hole body at the tip of the vaporized body 1, and to conduct this heat to the bottom through the side wall.

The time delay in heat conduction from the second part of the vaporized body 1 to the bottom part,
Cooling of the bottom of the vaporized body 1 by the liquid fuel and primary air, heat radiation from the outer surface of the vaporized body 1, etc. inevitably causes a large temperature difference between the tip and bottom of the vaporized body 1. These factors tend to cause deformation and material deterioration due to non-uniform expansion. - Also, although the bottom part vaporizes most of the liquid fuel, the temperature of the vaporized body 1 is the lowest, making it impossible to obtain a stable vaporization state and generating a large amount of tar. Furthermore, an electric heater 2 is used to maintain the temperature at the bottom of the vaporized body 1 at a constant temperature.
It is necessary to control the energization, and it consumes a lot of power, making it economical to use.

OBJECT OF THE INVENTION The present invention aims to solve these conventional problems, and aims to achieve stable vaporization without generating tar by effectively heating the bottom wall of the vaporizer, which contributes most to the vaporization of liquid fuel, with combustion exhaust gas. The purpose is to save power and maintain a uniform temperature throughout the vaporized body to improve durability.

Structure of the Invention In order to achieve this object, the present invention brings exhaust gas into contact with the outer surface of the bottom wall of the vaporizer orthogonally, and forms an exhaust gas discharge port facing the bottom wall. This allows the heat necessary for vaporization to be effectively fed back from the combustion exhaust gas to the bottom by conduction. Furthermore, the entire vaporized body can be maintained at a uniform temperature that is optimal for vaporization.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

Reference numeral 15 denotes a cylindrical vaporizer with a bottom, which is preheated by an electric heater 16 . 17 is the bottom wall of the vaporizer 16, and 18 is a mixing plate.

Reference numeral 19 denotes an outer cylinder, and a discharge port 20 for #L gas is provided at the lower part. 21 indicates an exhaust gas passage.

22 is a blower pipe, and 23 is a blower. 24 is a pipe, 2
5 is a pump for supplying liquid fuel; 1 and 26 are fluid regulators having a large number of small holes 27; a combustion body 28 made of a wire mesh or the like is placed on the outside; one end of the combustion body 28 is connected to the upper end of the vaporization body 15; It is set up. Reference numeral 29 is an outer plate made of heat-resistant glass or the like, and is placed on the outer cylinder 19I:. 30 is a cap.

The operation in the above configuration will be explained.

First, the electric heater 16 is energized and the vaporized body 15 is heated to about 300°.
Preheat to C. Next, when the blower 23 and pump 26 are energized, combustion air and fuel necessary for complete combustion are supplied into the vaporizer 16, and the fuel is vaporized to become a premixed gas with air.

This premixed gas enters the rectifier 26 from the center of the mixing plate 18, passes through the small holes 27, and is ejected onto the outer surface of the combustion body 28.
It is ignited here and burns. The combustion flame is formed thinly on the outer surface of the combustion body 28, and combustion is completed here and the combustion flame 28 is formed thinly on the outer surface of the combustion body 28.
8 itself becomes red hot at 860°C and radiates radiant heat through the outer panel 29. On the other hand, the combustion exhaust gas travels between the combustion body 28 and the outer plate 29, between the side wall of the vaporization body 16 and the outer cylinder 19, and further passes through a passage 2 provided below the bottom wall of the vaporization body 15.
1 and is discharged from the discharge port 20.

During the flow of combustion exhaust gas, sufficient heat is received at the side walls and bottom of the vaporizer 16, and even if the electric heater 16 is turned off, the fuel can be continuously vaporized only by feedback of combustion heat.

In particular, the exhaust gas hits the bottom of the vaporizer 16 in a perpendicular manner, which heats it intensively and maintains a high temperature, so that stable vaporization and tar generation can be suppressed.

Effects of the Invention The present invention forms an exhaust gas passage below the bottom of the vaporizer,
Furthermore, by applying the exhaust gas perpendicularly to the bottom wall, the following effects can be obtained.

(1) By intensively heating the bottom wall of the vaporizer, which vaporizes most of the fuel, with the combustion exhaust gas, it is possible to constantly maintain the optimal high temperature state for vaporization, increasing the vaporization rate.
A stable vaporization state without vaporization pulsation is obtained, and the generation of tar is suppressed to "1".

(2) During steady combustion, the bottom wall of the vaporized body is heated intensively, and heat is received from almost all of the outer surface, so the vaporized body itself can be maintained at a high and uniform temperature. Therefore, there is no local overheating, no deformation due to non-uniformity in the degree of thermal expansion, and durability is improved.

(3) Conventionally, it took time for heat to be conducted from the heat receiving part to the wall surface where the fuel is vaporized, but in the present invention, the exhaust gas reaches the bottom of the vaporized body immediately after combustion starts and is heated, so it is transferred to the electric heater. The energization can also be turned off immediately, resulting in power savings and stable vaporization.

[Brief explanation of drawings]

Fig. 1 is a side sectional view showing a conventional combustion device, and Fig. 2 is a side sectional view of a combustion device according to an embodiment of the present invention. , 21...
···aisle. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (1)

[Claims] A combustion section is connected to a bottomed cylindrical vaporizer that is preheated by an electric heater, and exhaust gas is introduced to the bottom of the vaporizer, so that the exhaust gas is almost orthogonal to the bottom of the vaporizer. Forms a contact passage/combustion device.