JPH0195210A - Liquid fuel burner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to combustion techniques for improving the vaporization performance of liquid combustion devices.

2. Description of the Related Art A conventional combustion apparatus for liquid fuel of this type has a configuration shown in FIG.

In Fig. 2, 1 is a vaporizer cylinder in which a heater 2 is embedded;
4 is a mixing plate, 4 is a first flame port formed integrally with the mixing plate 3 and arranged radially, 5 is a burner head in which a second flame port 6 consisting of many small holes is opened, and 7 is a periphery of the tip thereof. 9 is a secondary air supply pipe in which outlet ports 8 are opened in a radial manner; 9 is a secondary air chamber in which a number of air ports 10 are opened inward; 11 is a primary air nozzle in which a fuel nozzle 12 is arranged in the center. It is. Note that the secondary air supply pipe 7, secondary air chamber 9, and primary air nozzle 11 are each connected to a blower fan (not shown), and the fuel nozzle 12 is connected to a fuel supply device (not shown). ing.

In the above configuration, when the vaporization cylinder 1 is heated by the heater 2 and primary air and liquid fuel are supplied into the vaporization cylinder i from the primary air nozzle 11 and the fuel nozzle 12, the fuel is transferred to the heated inner wall of the vaporization cylinder 1. It is vaporized and mixed with primary air to form an air-fuel mixture, which is ejected from the first flame port 4 and the second flame port 6 and combusted.

At this time, secondary air is supplied outward from the blow-off port 8 of the secondary air supply pipe 7 and inwardly from the air port 10 of the secondary air chamber 9, thereby achieving complete combustion.

Further, when combustion starts, the vaporizing tube 1 is heated by the outward flame formed at the first flame port 4, and heat is recovered to the vaporizing tube 1.

Problems to be Solved by the Invention However, in the configuration as shown in FIG. 2, since the first flame port 4 directly heats a part of the vaporizing cylinder 1, the following problem occurred.

- During strong twist firing, the flame above the first flame port 4 comes into contact with the vaporizer tube 1, so that soot tends to adhere to the wall surface of the vaporizer tube 1.

(2) During weak combustion, the amount of heat transferred to the vaporization cylinder 1 decreases as the calorific value decreases, so the amount of heat required to vaporize the liquid fuel must be supplemented by the heater 2.

The present invention solves the problems of the conventional example and improves the vaporization and ignition performance of a liquid combustion device.

Means for Solving the Problems The present invention takes the following measures to solve the above problems. In other words, it has a bottom surface, a cylindrical vaporizing tube that has a hollow cylinder extending vertically and upwardly through the bottom surface, and has a built-in electric heater, and a plurality of flame holes, It consists of an inner cylinder that forms a combustion chamber inside and exposes the hollow cylinder of the vaporizer cylinder into the combustion chamber, and an outer cylinder that surrounds the inner cylinder and is attached to the top of the vaporizer cylinder. The joint surface of the outer cylinder and the vaporizer cylinder is positioned above the flame hole at the lowest end of the inner cylinder.

Function The present invention can realize stable vaporization by the mechanism described below with the above-described configuration.

During combustion, the flame heats the flame hole with its radiant energy,
The heated flame hole heats a portion of the vaporizer tube by the same radiant energy and conduction. A part of the heat energy transferred from the flame to the vaporization tube is supplied to the vaporization surface of the vaporization tube and used to vaporize the liquid fuel. Now, during strong twist firing, the atmospheric temperature within the combustion chamber is higher than the radiant energy from the flame, so the flame hole temperature is high enough to release sufficient radiant energy for vaporization. On the other hand, during weak combustion, the flame approaches the flame hole surface, so the flame hole temperature is dominated by the radiant energy from the flame.

The flame hole temperature at this time is at the same level as during strong twist firing. As described above, according to the present invention, in both strong combustion and weak combustion, the heater generates its own heat without energizing the heater.
Can maintain vaporization.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. As shown in FIG. 1, the liquid combustion device consists of a vaporization section and a combustion section.

The vaporization section includes a round-shaped vaporization tube 13, an electric heater 14 built into the upper part of the vaporization tube 13, and a hollow 15 for supplying secondary air that extends vertically and upward through the bottom of the vaporization tube 13. Consisting of Nozzle 1 that supplies kerosene into the vaporizer cylinder 13
6 and a primary air supply pipe 17 are joined to the side surface of the vaporizer cylinder 13.

The combustion section is composed of an inner cylinder 18 and an outer cylinder 19 surrounding the inner cylinder 18. The inner cylinder 18 has a flame hole 20 consisting of a plurality of round holes.
and a combustion chamber 21 formed inside the conversion part 1B,
The hollow cylinder 15 faces into the combustion chamber 21.

The outer cylinder 19 surrounds the inner cylinder 18 and is attached to the vaporizer cylinder 13. The position of the joint surface between the outer cylinder 19 and the vaporizer cylinder 13 is located at the middle of the flame hole 1B. Further, the spark plug 22 faces near the flame hole 20 at the lower end.

In the above configuration, the liquid fuel is stably vaporized during combustion through the process described below. The vaporization process during hard twist firing is maintained by heating the vaporization tube 13 behind the flame hole 20 by the atmosphere within the combustion chamber 21 rather than by radiant energy from the flame. On the other hand, in the vaporization process during weak combustion, the radiant energy from the flame becomes more dominant than the atmosphere within the combustion chamber 21. This is because the flame during strong twist firing is kept farther away from the flame hole 20 than the flame during weak combustion, so the flame hole 20 is heated less directly and indirectly. In other words, if we compare the temperature raising effect of the large hole 20 using only flame, weak combustion will be higher; on the other hand, if we compare the atmospheric temperature in the combustion chamber 21, it will naturally be higher for strong combustion. be. Therefore, the vaporization characteristics determined by the radiant energy from the flame and the atmospheric temperature within the combustion chamber 21 are stable in both strong and weak combustion.

Effects of the Invention As described above, according to the liquid combustion device of the present invention, the following effects can be obtained.

(1) By raising a part of the vaporization cylinder up to the flame hole,
Since it can absorb radiant energy from the flame and combustion chamber, stable vaporization is possible in both strong and weak combustion.

(2) By having a hollow cylinder facing into the combustion chamber,
A portion of the heat energy in the combustion chamber can be transferred to the vaporization cylinder, so vaporization can be promoted and maintained.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a liquid fuel combustion device showing an embodiment of the present invention, and FIG. 2 is a vertical cross-sectional view showing a conventional liquid fuel combustion device. 13... Vaporization cylinder, 14... Electric heater, 15... Hollow cylinder, 18... Inner cylinder, 19... Mark outer cylinder, 20 ...flame hole, 21...
... Combustion chamber.

Claims (1)

[Claims] A cylindrical vaporizing cylinder having a bottom surface, a hollow cylinder extending vertically and upwardly through the bottom surface, and a cylindrical vaporizing cylinder having a built-in electric heater, and a plurality of flame holes, with a combustion chamber inside. and an inner cylinder that faces the hollow cylinder of the vaporizer cylinder into the combustion chamber, and an outer cylinder that surrounds the inner cylinder and is attached to the upper part of the vaporizer cylinder, and the outer cylinder and the A liquid fuel combustion device in which the joint surface of the vaporizing cylinder is located above the flame hole at the lowest end of the inner cylinder.