JPS59142313A - Evaporating type kerosene burner - Google Patents

Abstract

PURPOSE:To prevent tar from depositing on the evaporating surface and to secure stable combustion for a long period of time by subjecting the metallic evaporating surface to a coarsening treatment, coating the metallic evaporating surface with a heat-resisting inorganic coating material carrying a hydrocarbon oxidation catalyst on the surface of the coating material, and controlling the temperature of the evaporating surface above the film boiling temperature of kerosene. CONSTITUTION:A metallic evaporating surface is subjected to a coarsening treatment. The evaporating surface is coated with a heat-resisting inorganic coating material, and a hydrocarbon oxidation catalyst is carried on the surface of a heat-resisting inorganic coating material. An electric heater 9 and a temperature detecting element 10 are mounted on a metallic evaporating cylinder 8, and the temperature of the evaporating material is controlled to a temperature above the film boiling temperature. For the heat-resisting inorganic coating material 16, are used a member or more members selected from the group consisting of silicate system inorganic coating materials and phosphate system inorganic coating materials. For the hydrocarbon oxidation catalyst 17, are used a member or more members selected from the group consisting of manganese oxide, copper oxide, silver oxide, cobalt oxide, iron oxide and vanadium oxide. The coarseness of the evaporating surface is selected to 50-500mum. Accordingly, the area of the evaporating surface is increased, and the quantity of tar deposited per unit area is decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a vaporizing oil combustion device, and more particularly to a vaporizing section thereof.

The structure of conventional examples and their problems The vaporizing surface of conventional vaporizing oil combustion equipment is a smooth metal surface made of die-cast aluminum or machined, and the oil (kerosene) is vaporized in the nucleate boiling temperature range of 300°C or less. .

This type of device has a simple structure and is easy to control combustion, but on the other hand, tar accumulates on the vaporization surface, reducing heat transfer from the vaporization surface to the fuel, reducing the vaporization rate and causing pulsation. It has the disadvantage that stable combustion is hindered by the generation of white smoke and odor when ignited or extinguished.

In particular, impurities such as denatured oil 1 heavy oil (peroxides, organic acids, etc.)
The disadvantage of using fuel containing gum, etc. was that a large amount of tar would accumulate after a short period of combustion.

Purpose of the Invention The present invention aims to eliminate such conventional drawbacks, and aims to prevent tar from accumulating on the vaporizing surface and ensure stable combustion for a long period of time.

Structure of the Invention In order to achieve this object, the present invention roughens a metal vaporized surface, coats the vaporized surface with a heat-resistant inorganic paint, supports a hydrocarbon oxidation catalyst on the surface of the paint, and An electric heater and a temperature detection element were attached to the vaporization cylinder to control the vaporization surface temperature above the film boiling temperature of oil.

By adopting this configuration, the amount of tar that accumulates is extremely reduced due to the effect described below.

(1) By setting the vaporization surface temperature to the film boiling temperature or higher,
Since petroleum is granulated and vaporized while moving on the vaporization surface, tar impurities are also vaporized at the same time, reducing the amount of tar impurities that accumulate on the vaporization surface.

(2) Tar impurities in petroleum are a complex mixture containing saturated hydrocarbons, unsaturated hydrocarbons as main components, and esters, organic acids, peroxides, naphthenic acids, and phenolic compounds as subcomponents. It gradually decomposes at ~2426°C, and oxidizes and burns at around 500'C. However, when tar impurities come into contact with a hydrocarbon oxidation catalyst, they cause an oxidation reaction and burn at around aoo'c. Therefore, by setting the vaporization surface temperature above the film boiling temperature, the bulk amount of tar can be significantly reduced.

(3) By supporting the hydrocarbon oxidation catalyst on the surface of the heat-resistant inorganic paint, it becomes a high-performance tar removal vaporization surface.

(4) Compared to metals, heat-resistant inorganic paints have a high radiation rate and have a high heating effect on oil droplets, increasing the evaporation rate.

'(6) By roughening the vaporizing surface, the vaporizing surface area increases and the amount of tar deposited per unit area decreases.

(6) Oil droplets come into point contact at more points than on a smooth vaporization surface, and are more likely to receive conductive heat from the vaporization surface, making it easier to vaporize.

(7) Tar impurities that accumulate on the vaporization surface come into contact with the hydrocarbon oxidation catalyst, cause an oxidation reaction, and are burned.

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

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

Reference numeral 9 indicates an electric heater embedded in the vaporization cylinder 8, and 1° indicates a temperature detection element on the vaporization surface.

Reference numeral 11 designates a turbo fan that is fixedly installed in the middle of the motor shaft within the burner case 2. In combination with the guide blade 12 that is fixed to the burner case 2, the air-blowing vaporization surface 16 is pre-roughened to a surface roughness of 100 microns. A phosphate-based heat-resistant inorganic paint with a thickness of 30 microns was applied and baked on the vaporization surface of the aluminum vaporization tube 8, and then a manganese nitrate aqueous solution was applied and baked to support a manganese dioxide catalyst. A model of the state is shown in Figure 2. In the figure, 8 is an aluminum vaporization cylinder with a roughened surface, 16 is a phosphate-based heat-resistant inorganic paint, 17 is a hydrocarbon oxidation catalyst layer made of manga dioxide, and 18 is an oil droplet on the vaporization surface. It vaporizes while moving above 17.

The radiation rate of the vaporization surface in this example was 0.9.

27% of altered kerosene with a total acid value of 0.1 is placed in a vaporizing cylinder 8 with an inner diameter of 84mm.
The amount of tar deposited on the vaporization surface 16 was measured gravimetrically during continuous combustion by feeding at a rate of 0 m1/Hr, and the results shown in curve A in FIG. 3 were obtained.

The temperature of the vaporizer cylinder at this time was 350''C.

In the same figure, curve B is the conventional example, the vaporizing surface 16- is made of machined smooth aluminum with an emissivity of 0.1, and the attachment of the vaporizing surface 16 is 350''C. The tar storage capacity of the vaporizing kerosene combustion device in this example is 10
It decreased to % of the conventional example at 0 hours.

Example 2 The vaporizing surface 16 of an iron vaporizing cylinder having the same shape and dimensions as in Example 1 was roughened to a surface roughness of 100 microns, and a silicate-based heat-resistant inorganic coating with a thickness of 30 microns was painted and baked on top. A copper oxide catalyst was supported by coating and baking a copper nitrate aqueous solution. The model for the vaporization state of kerosene is the same as in Figure 2. In this example, the number of cars that I was heading to was (19).

When the amount of tar produced was measured under the same conditions as in Example 1, it decreased to % of the conventional example after 100 hours, as shown by curve C in Figure 3.

Effects of the Invention According to the vaporizing oil combustion device of the present invention, the vaporizing surface of the metal vaporizing tube is roughened, this vaporizing surface is coated with a heat-resistant inorganic paint, and a hydrocarbon oxidation catalyst is supported on the surface of the paint. At the same time, by controlling the vaporization surface temperature above the film boiling temperature, the vaporization surface area is increased, the evaporation rate of oil is increased, and the amount of tar generated is significantly reduced by promoting the oxidation reaction of tar impurities in oil. The effect of doing so can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a vaporizing oil combustion device according to an embodiment of the present invention, FIG. 2 is a diagram showing the vaporization state of kerosene on the vaporizing surface, and FIG. 3 is a characteristic diagram explaining the effects of the device. It is. 8 ・Metal vaporizer cylinder, 9... Electric heater, 1°・
... Temperature detection element, 16 ... Heat-resistant inorganic paint, 17 ... Hydrocarbon oxidation catalyst.

Claims (1)

[Claims] 0) The metal vaporization surface is roughened, the vaporization surface is coated with a heat-resistant inorganic paint, a hydrocarbon oxidation catalyst is supported on the surface of the heat-resistant inorganic paint, and the metal vaporization cylinder is coated with a hydrocarbon oxidation catalyst. A vaporizing oil combustion device equipped with an electric heater and a temperature detection element to control the vaporizing surface temperature above the film boiling temperature. (2) Claims selected from the group of silicate-based inorganic paints and sinate-based inorganic paints as heat-resistant inorganic paints.Claim 1 that uses one or more types selected from the group of vanadiums. The vaporizing oil combustion device described in . (4) The vaporizing oil combustion device according to claim 1, wherein the vaporizing surface has a roughness of 60 to 500 microns.