JPS5997413A - Vaporizing type kerosene burner - Google Patents

Abstract

PURPOSE:To prevent a vaporizing surface from the deposit of tar to thereby ensure a stable combustion over an extended period, by coating a heat resistant inorganic paint having a hydrocarbon-dissolved catalyst over a metallic vaporizing cylinder surface having a roughened vaporizing surface to maintain the temperature of vaporizing surface higher than a specific temperature. CONSTITUTION:When the temperature of vaporizing cylinder 8 is elevated above 350 deg.C by energizing a preheating heater 9, a motor 4 is actuated to thereby turn a cone 5, a shake-off disk 6 and an agitating blade 7. Upon the starting of a turbo-fan 10 producing an air pressure, a primary and a secondary combustion air flow inside and outside a vaporizing cylinder 2. A fuel pump is actuated simultaneously with the start-up of air blowing, and a liquid fuel is supplied to a cone 5 through a supply pipe 14, the fuel is converted into an oil drop 18 of micro- particles and then scattered towards a vaporizing surface 15. In the meantime, the vaporizing surface 15 which has undergone a surface roughening treatment beforehand is coated with a phosphate-based heat resistant inorganic paint containing 10wt% of zeolite containing rare earth and baked, and its emissivity is 0.9.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a vaporizing kerosene combustion device, and more particularly to a vaporizing section thereof.

Configuration of conventional examples and their problems The vaporizing surface of conventional vaporizing kerosene combustion equipment is a smooth metal surface made of die-cast aluminum or machined.
Kerosene was vaporized in a nucleate boiling area temperature below ℃.

This type of equipment has a simple structure and is easy to control combustion, but on the other hand, vaporized residue (tar) accumulates on the surface where the kerosene is evaporated (hereinafter referred to as the "vaporization surface"). heat transfer from the fuel to the fuel is reduced,
There were disadvantages in that the vaporization rate decreased and pulsation occurred, and white smoke and odor were generated during ignition and extinguishment, impeding stable combustion.

Especially impurities such as denatured oil (9 heavy oil) (peroxides).

When a fuel containing organic acids, gum, etc. is used, a large amount of tar accumulates in a short period of time. The purpose of this is to prevent tar buildup and ensure stable combustion over a long period of time.

DESCRIPTION OF THE INVENTION In order to achieve this object, the present invention has the vaporizing surface temperature set to be higher than the film boiling region temperature, and the vaporizing surface is made of a material having high thermal conductivity and high resistance to explosion. With this configuration, the liquid fuel that comes into contact with the vaporization surface causes film boiling, becomes particles, and evaporates while moving on the vaporization surface.

In order to achieve this object, the present invention coats the surface of a metal vaporizer cylinder with a roughened vaporization surface with a heat-resistant inorganic paint containing a hydrocarbon decomposition catalyst, and heats the vaporization surface to 350°C or higher. It is something.

With such a configuration, the amount of accumulated tar can be extremely reduced due to the effect described below.

(1) By setting the temperature of the vaporizing surface to 350°C or higher, kerosene undergoes film boiling, becomes particulate, and evaporates while moving on the vaporizing surface. Tar impurities are also vaporized at the same time, and a small amount of non-volatile impurities are transferred to the vaporizing surface. It just piles up.

Acids, peroxides, diolefins, naphthenic acids.

Mixture of phenolic compounds etc. 200°C~6
Although it gradually decomposes at 00°C, the decomposition rate increases rapidly when it comes into contact with a hydrocarbon decomposition catalyst at temperatures above 350°C.

(3) Heat-resistant inorganic paints have a higher radiation rate than metals, so they have a higher heating effect on oil droplets and accelerate the evaporation rate.

(4) By roughening the vaporization surface, the vaporization surface area increases and the amount of tar deposited per unit area is reduced.

(5) Oil droplets make point contact in more places than on a smooth vaporizing surface and are easily vaporized because they receive heat from the vaporizing surface (6) Hydrocarbons that accumulate on the vaporizing surface come into contact with the decomposition catalyst and are decomposed. do.

Description of examples Embodiments of the present invention will be described below with reference to the drawings.

(1) Example 1 In FIG. 1, 1 to 3 are a cylindrical motor case, a burner case, and a combustion cylinder, which are connected in this order. 4
is a motor installed inside a motor case 1, and its shaft is connected to a conical cone 6, a circular swinging plate 6, and a stirring blade 7 inside the burner case. Reference numeral 8 denotes a cylindrical vaporizing cylinder installed inside the burner case 2, and is made of aluminum with good thermal conductivity.

9 is a preheating sheathed heater embedded in the vaporization cylinder.

1o is a turbo fan fixedly attached to the middle of the motor shaft in the burner case 2, and in combination with a guide blade 11 fixed to the burner case 2 forms an air blowing chamber.

In the above configuration, at the start of combustion, the preheating sheathed heater 9 is first energized to heat the vaporization cylinder 8. When the temperature of the vaporizer cylinder 8 rises to 9350°C or higher due to energization,
The motor 4 starts, and the cone 6, swing-off plate 6, and stirring blade 7 rotate.

When the turbofan 10 generates wind pressure, secondary and secondary combustion air flows inside and outside the carburetor cylinder 2.

Simultaneously with the start of air blowing, the fuel pump operates, and liquid fuel is supplied onto the cone 5 through the supply pipe 14, passes through the shaker plate 6 and the stirring blade 7, and is dispersed as fine oil droplets toward the vaporized substance 15. do.

On the other hand, since primary air is sent into the vaporizer cylinder 2, it is mixed with vaporized kerosene to form a mixed gas flow, which passes through the burner head 12 and becomes a combustion flame 13.

Vaporization 16 is a phosphate-based heat-resistant inorganic paint that contains 10% by weight of rare earth-containing zeolite (Y-type zeolite containing 7% lanthanum) and is baked, and has an emissivity of 0.9.

The vaporized surface was roughened in advance to a surface roughness of 100μ,
Fig. 2 shows a model in which 30 μm of the above heat-resistant paint was applied and baked on top of the heat-resistant paint, showing the vaporization state of 1 kerosene.

In the figure, 8 is a metal vaporizing cylinder with a roughened surface, 15 is a heat-resistant inorganic paint containing a hydrocarbon decomposition catalyst, and 18 is an oil droplet, which is vaporized while moving on the vaporizing surface.

When kerosene with a total oxidation rate of 0.1 is supplied to a vaporizing cylinder with an inner diameter of B 4 #W at a rate of 270 mQ/Hr and burned continuously, and the amount of tar deposited on the vaporizing surface is measured gravimetrically, the curve shown in Figure 3 is obtained. We obtained results that can be shown to people. The temperature of the vaporizer cylinder at this time was 360°C.

In the same figure, curve B is a conventional example, in which the vaporization surface is machined smooth aluminum, the width to vehicle is 0.1, and the vaporization surface temperature is 350°C.

As shown in the figure, the accumulation of tar in the vaporized kerosene combustion apparatus of the present invention was reduced to 1/4 of that of the conventional example in 100 hours.

(Example 2) The vaporization surface of an iron vaporization cylinder having the same shape and dimensions as Example 1 was roughened to a surface roughness of 10μ, and a silicate-based heat-resistant inorganic paint containing 10% by weight of potassium carbonate was painted and baked. When the amount of tar produced was measured under the same conditions as in Example 1, the IQO time was reduced to 1/3 of that of the conventional example, as shown by curve C in FIG.

Effects of the Invention As described above, according to the vaporizing kerosene combustion device of the present invention, the surface of the metal vaporizing cylinder having a roughened vaporizing surface is coated with a heat-resistant inorganic paint containing a hydrocarbon decomposition catalyst, and the vaporizing By setting the surface temperature to 360°C or higher, the effect of increasing the evaporation surface area, increasing the evaporation rate of kerosene, and promoting the decomposition of tar impurities in kerosene, resulting in a reduction in tar production is obtained.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a vaporizing kerosene combustion device according to an embodiment of the present invention, and FIG. 2 is a diagram showing the vaporization state on the vaporization surface.
FIG. 3 is a characteristic diagram illustrating the effects of the device. 1... Motor case, 2... Burner case, 3... Combustion f1M, 4...
Motor, 5... Cone, 6... 9 circular cutting plates, 7... Stirring blade, 8...
...vaporizer cylinder.

Claims (4)

[Claims] (1) A heat-resistant inorganic paint containing a hydrocarbon decomposition catalyst is coated on the surface of a metal vaporization cylinder having a roughened vaporization surface,
This vaporizing kerosene combustion device has a vaporization surface of 350'C or higher. (2) The vaporizing kerosene combustion device according to claim 1, wherein the heat-resistant inorganic paint is selected from the group of silicate-based inorganic paints and sicate-based inorganic paints. (3) Claims that include, as a hydrocarbon decomposition catalyst, one or more selected from the group of □alkali metal or alkaline earth modern oxides, hydroxide carbonates, platinum group elements, and aluminum silicate salts. The vaporizing kerosene combustion device according to item 1. (4) The vaporizing kerosene combustion device according to claim 1, wherein the vaporizing surface has a roughness of 5o to SOOμ.