JPS5997412A - Vaporizing type kerosene burner - Google Patents

Abstract

PURPOSE:To reduce the deposit of tar and thereby maintain a favorable combustion state over an extended period, by constituting a vaporizing surface with a metallized layer of heat resistant metal, a chemical film having a metallic oxide as a principal ingredient and a platinum-based catalyst, and by maintaining the temperature of varporizing surface at a level higher than the boiling temperature of kerosene film. CONSTITUTION:A vaporizing surface 13 is constituted with a flame-spray metallized layer 16 of heat resistant metal formed over the surface of basic material of vaporizing cylinder, a chemical film 17 having as a principal ingredient a metallic oxide formed over the metallized layer 16 and a platinum-based catalyst 18 carried on the chemical film 17. The vaporizing surface 13 is heated up to a temperature higher than the boiling temperature of kerosene film by heating the tip of vaporizing cylinder 8 with a combustion heat. In this case, measurement has been made with a tar weight to be deposited on the vaporizing surface 13 during a continuous combustion, while supplying to the vaporizing cylinder 8 (84mm. in inner diameter) a reformed kerosene with 0.1 of total acid number at the rate of 270ml/H. Measurement results are shown in a figure.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION This invention relates to kerosene combustion equipment, and more particularly to its vaporization aspects.

The structure of conventional examples and their problems The vaporizing cylinder of conventional kerosene combustion equipment was made of metal such as aluminum die-casting, and the kerosene was vaporized at a temperature in the nucleate boiling region on the vaporizing surface made of a smooth metal surface. .

This type of device has a simple structure and can easily control combustion, but on the other hand, tar accumulates on the vaporizing surface, reducing heat transfer from the vaporizing surface to the kerosene, reducing the vaporization rate and causing pulsating combustion. Disadvantages include that they cause white smoke and odor when ignited and extinguished, impeding stable combustion. Especially denatured oil.

When fuels containing impurities (peroxides, organic acids, fats, etc.) such as heavy oil are used, they have the disadvantage of accumulating large amounts of tar during short-term combustion.

OBJECT OF THE INVENTION The present invention solves this drawback and aims to reduce the amount of water that accumulates on vaporizing surfaces.
An object of the present invention is to provide a kerosene combustion device that maintains stable combustion for a long period of time while reducing the amount of kerosene. In the machine, the vaporization surface of the vaporization cylinder is
, ■.

■ The evaporation surface has a thermally sprayed layer of heat-resistant metal formed on the base material,
It is composed of a chemical conversion coating mainly composed of metal oxides formed on the thermal sprayed layer, and a platinum group catalyst supported on the stopper chemical conversion coating.

■ The temperature of the vaporizing surface was set to be higher than the film boiling temperature of kerosene.

With this structure, the kerosene forms a film, becomes particulate, floats above the vaporization surface, moves, and then evaporates from the entire vaporization surface. Furthermore, the surface area of the vaporizing surface increases, the rate of evaporation of kerosene is accelerated, and the decomposition of tar is promoted by the action of the platinum group catalyst.

Description of examples Hereinafter, it will be explained in detail using examples.

FIG. 1 is a sectional view of a main part of a kerosene combustion device which is an embodiment of the present invention. Motor case 1. Burner case 2.
The combustion tubes 3 are connected in this order. The motor 4 is housed in the motor case 1, and its shaft connects to a conical cone 52 in the burner case 2 and a circular cutting plate 6.
．． It is connected to the stirring blade 7. The cylindrical vaporizing cylinder 8 is housed in the burner case 2 and is made of a metal material with good thermal conductivity. Preheating sheathed heater 9
is buried in the vaporizer cylinder 8. Turbo fan 1o is
It is fixed in the middle of the shaft of the motor 4 inside the burner case 2, and in combination with the guide vane 11 fixed to the burner case 2 constitutes an air blowing chamber.

In the above configuration, when starting combustion, first, the preheating sheathed heater 9 is energized to heat the vaporization tube 8. When the temperature of the vaporizer cylinder 8 rises to the temperature at which kerosene film boils by applying electricity, the motor 4 starts and the cone 5. Shaking board 6
．． The stirring blade 7 rotates. When the turbo fan 1o generates wind pressure, secondary and secondary combustion air flows in and out of the carburetor cylinder 8. Simultaneously with the start of air blowing, a fuel pump (not shown) is activated, and kerosene is supplied onto the cone 5 through the supply pipe 12, and the swinging plate 6. After passing through the stirring blade 7, the oil becomes fine oil droplets and scatters toward the vaporizing surface 13.

On the other hand, primary air is sent into the vaporization cylinder 8, and it boils on the vaporization surface 13 and mixes with the vaporized kerosene vapor to form a mixed gas flow, which passes through the no<-nahe nod 14 and is combusted. The flame becomes 16.

FIG. 2 is a cross-sectional view of the vaporization surface. The vaporizing surface 13 is a thermally sprayed layer 16 of a heat-resistant metal formed on the surface of the base material 8' of the vaporizing tube.
, a chemical conversion coating mainly composed of metal oxide formed on the sprayed layer 16 , and a platinum group catalyst 18 supported on the chemical conversion coating 17 .
It is made up of.

In addition, the tip of the vaporizing tube 8 is heated by the heat of combustion, and the temperature of the vaporizing surface 13 is made to be 7 degrees higher than the film boiling temperature of kerosene.

270ml of altered kerosene with a total acid value of 0.1 is placed in this vaporizer cylinder 8 (inner diameter 84mm)! Continuous combustion while supplying at a ratio of /H,
The weight of tar deposited on the vaporization surface 13 was measured. The results are shown in FIG. The vaporization surface temperature at this time was 325℃.
This is higher than the film boiling temperature of kerosene.

Curve A indicates that the vaporization surface is made of aluminum die-casting (Al s
4%) It shows the change over time in the amount of tar produced when the base material of the vaporization cylinder is smooth.

In this example, curve B shows the tar in the case of a vaporized surface in which an aluminum sprayed layer formed on the surface of a base material is subjected to a chemical conversion treatment to form an aluminum oxide chemical conversion film, and platinum is supported on this chemical conversion film. It shows the change in production amount over time. This vaporized surface is made by forming an aluminum sprayed layer on the surface of an aluminum die casting (A784%) base material by electric arc spraying, and then chemically treating this aluminum sprayed layer with a solution containing sodium carbonate solution as the main component. A chemical conversion film of aluminum oxide is formed, and chloroplatinic acid (H2PtCl4
．． Impregnate the chemical conversion coating with a solution of 6H20)
After drying at ℃ for several hours, baking at 400℃ for 3 hours to form platinum'io.
, 3 wt%.

In this example, the curve C shows the adhesive resistance in the case of a vaporized surface in which an aluminum sprayed layer formed on the surface of a base material is subjected to a chemical conversion treatment to form an aluminum oxide chemical conversion film, and palladium is supported on the chemical conversion film. - Shows the time-varying changes in the amount of oil produced. The production of the vaporization surface is the same as the above-mentioned operation procedure, and a chemical conversion treatment is applied to a thermally sprayed layer of aluminum (A199.0% or more) to form a chemical conversion film of aluminum oxide, and this chemical conversion film is thermally sprayed with palladium chloride. 0.3 palladium
I made it carry wt chi.

In this example, if the curved line is an aluminum alloy formed on the surface of the base material, the main component is Cu.

Si, Fe, Mn, Zn, Cr, T
The thermal sprayed layer (containing i) is subjected to chemical conversion treatment to form a chemical conversion film containing aluminum oxide as the main component, and the change over time in the amount of tar generated in the case of a vaporized surface with ruthenium supported on this chemical conversion film was investigated. show.

In this example, curve E shows that the aluminum sprayed layer formed on the surface of the base material is subjected to chemical conversion treatment to form a chemical coating mainly composed of aluminum oxide, and rhodium is added to this chemical conversion coating. This figure shows the change over time in the amount of tar generated when the vaporizing surface is held.

In this example, curve F is a vaporized surface in which a chemical conversion coating of aluminum oxide is formed by applying a chemical conversion treatment to the amount of aluminum sprayed on the surface of a base material, and platinum and palladium are supported on this chemical conversion coating. shows the amount of tar produced.

Curves B, C, D, E, and F, which are examples of the present invention, generate less tar than curve A, which returns on a smooth vaporization surface.

For comparison, curve G shows the change over time in the amount of tar produced in a conventional case in which the vaporizing surface is a smooth aluminum die-cast and the vaporizing surface temperature is the nucleate boiling temperature (experimented at 275° C.).

Curves B, C, D, E, and F, which are examples of the present invention, produce less tar than curve G, which is a conventional example.

The evaporation form of kerosene changes around 285°C, with film boiling at temperatures higher than around 286°C and nucleate boiling at temperatures below around 286°C. When kerosene was evaporated above the film boiling temperature, the kerosene became fine particles, floated above the vaporization surface, and evaporated from the entire vaporization surface while moving.

In addition, using osmium, iridium, and iridium as platinum group catalysts, a chemical conversion treatment is performed on the aluminum sprayed layer formed on the surface of the base material to form a chemical conversion film of aluminum oxide, and the vaporization surface on which these catalysts are supported is treated. In this case, the amount of tar produced was less than that of curve A, which is a smooth vaporization surface. In addition, based on the activity of the catalyst, platinum, radium, and ruthenium are used.

Single or multiple combinations of rhodium were optimal. Further, the optimum supported amount was 0.01 to 3 wt%.

In the present invention, the heat-resistant metal is iron, aluminum, copper, or an alloy thereof, and aluminum and an aluminum alloy are particularly suitable. The optimum surface roughness of these sprayed layers is 5 to 50 μm in terms of center line average roughness (Ra). It is chemically treated to form a chemical conversion film whose main component is a heat-resistant metal oxide.
A film thickness of several microns was optimal. These chemical conversion coatings have good adhesion to the thermally sprayed layer of heat-resistant metal.

Effects of the Invention As described above, according to the present invention, the vaporizing surface includes a thermally sprayed layer of a heat-resistant metal formed on the vaporizer cylinder base material, a chemical conversion coating mainly composed of a metal oxide formed on this thermally sprayed layer, By making the vaporization surface temperature higher than the film boiling temperature of kerosene, 75 steps of evaporation are performed on the entire vaporization surface, and the tar is decomposed by the action of the platinum group catalyst. Since the power is promoted, the amount of tar generated on the vaporization surface is reduced, resulting in the effect of maintaining stable combustion for a long period of time.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a main part of a vaporizing kerosene combustion device which is an embodiment of the present invention, Fig. 2 is a sectional view of the vaporizing surface of the main part, and Fig. 3 is a characteristic diagram explaining the present invention in detail. 0 8... Vaporization tube, 8'... Base material, 13.
... Vaporization surface, 16 ... Thermal spray layer, 17 ...
...Chemical coating, 18...Platinum group catalyst. Name of agent: Patent attorney Toshio Nakao, 1 person Figure 1 Figure 2 Figure 3 1π, ・Tora Xu Kai

Claims (3)

[Claims] (1) The base material of the vaporization cylinder is made of metal, and the vaporization of the vaporization cylinder forms a heat-resistant metal sprayed layer formed on the base material and a chemical conversion coating mainly composed of metal oxide formed on this sprayed layer. , is composed of a platinum group catalyst held in this chemical conversion film, and
A vaporizing kerosene combustion machine with a vaporization surface filtration rate higher than the film boiling temperature of kerosene. (2) The vaporization formula % formula % according to claim 1, wherein the heat-resistant metal is "aluminum or aluminum triple alloy" (3) The vaporizing kerosene combustor according to claim 1, wherein the platinum group catalyst is one or more selected from the group of platinum, palladium, ruthenium, and rhodium.