JPS5916814B2 - Kerosene vaporization catalyst - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION At present, kerosene stoves are widely used among household heating appliances.

These stoves use kerosene as fuel and use the vaporization combustion method to generate heat for heating, and are divided into two main types: portable stoves, which release combustion gas indoors, and pot stoves, which have an attached exhaust pipe and release combustion gas outdoors. There is a stove.

A common problem with these conventional kerosene stoves is that tar accumulates in the kerosene vaporizer, causing the heater to not function properly as a combustion appliance.

For example, the combustion device main body of a pot-type stove is as shown in FIG. 1A, and in this FIG.
6 is an oil pipe, 6 is an exhaust pipe, 7 is a tar accumulation position, and 8 is a vaporization part.

In this case, the bottom of the metal pot 3 serves as a kerosene vaporization section 8, where tar 7 is deposited and incomplete combustion generates carbon, carbon monoxide, and odor.

The present invention provides a kerosene vaporization catalyst that solves the above-mentioned problems of pot-type stoves.The properties that this kerosene vaporization catalyst should have include oil resistance, heat resistance, and tar suppression. For example, it is effective.

The present invention is based on the discovery of a new kerosene vaporization catalyst having the above-mentioned properties as a result of research on various types of tar-suppressing catalysts.

In other words, the base material of the kerosene vaporization catalyst of the pot nucleating hot air fan needs to have oil resistance and heat resistance, and it has become clear that inorganic paper is the most suitable base material.

The inorganic paper used was one of ceramic, glass, and cloth, and all had no problems in oil resistance and heat resistance as base materials for kerosene vaporization catalysts.

It has become clear that the tar suppression effect is not affected by the type of base material, but is determined by the impregnated catalyst.

It has now been found that alkali or alkaline earth metal oxides, hydroxides, or carbonates are effective as tar-suppressing catalysts.

Among them, potassium carbonate was the most effective catalyst.

Furthermore, it has been revealed that an inorganic binder is most suitable for impregnating and coating an inorganic paper with a catalyst in terms of oil resistance and heat resistance.

That is, it has been revealed that alkali metal silicate aqueous solutions, acidic metal phosphate aqueous solutions, silicates, alumina sol, silica sol, and binders in combinations thereof are effective.

Among them, silicate binders are self-hardening and have a temperature of 70 to 85℃.
It was the most effective binder in that it had a solidified state and formed a film with high oil resistance, heat resistance, and adhesive strength.

Hereinafter, the configuration and effects of the present invention will be explained in more detail with reference to Examples.

Example 1 Is the test piece 10X80? ? Z/? ? Z1 thickness 1m/
A stack of 10 sheets of 772 strips of ceramic paper was prepared.

Next, the specific gravity at 25°C is 1.21 and the viscosity is 10 C.P.

PH=10.9 and molar ratio (S i02/L102)3.
A liquid was prepared by diluting the lithium silicate of No. 5 with 10 times the amount of pure water and uniformly dissolving potassium carbonate in an amount of 5 wt %.

The previously prepared ceramic paper was immersed in the solution prepared in this way to impregnate the catalyst and binder, and then
Dry curing was performed at 0° C. for 1 hour.

Sample shop 3 shown in Table 1 is a sample prepared in this manner.

The tar suppression effect of the obtained kerosene vaporization catalyst was measured by the method shown in FIG.

In this FIG. 2, 9 is the kerosene vaporization catalyst obtained by the present invention, 10 is a container, and 11 is kerosene (100 m
1), 12 is an electric furnace for heating, and the temperature at the upper end of the kerosene vaporization catalyst body in the center of the hollow is 170°C.

13 is a measuring thermocouple (C, A line). 14 is the deposited tar.

The tar deposited after vaporizing kerosene 1007721 was extracted with acetone 1007721, and the degree of coloring was measured by absorbance at a wavelength of 420 mμ using a spectrophotometer.

In Table 1, Samples A1-7 show the effect of potassium carbonate concentration, and Samples 116.8-15 show the effect when the catalyst amount is fixed at 5 wt% and potassium carbonate is replaced with another catalyst.

From Table 1, it can be seen that adding an alkali or alkaline earth metal salt to an inorganic binder has a tar suppression effect.

In particular, those with potassium carbonate added are good, and the amount added is best from 5 to 20 wt%, and it can be seen that even 1 to 25 wt% is effective.

Inorganic paper other than ceramic paper was similarly impregnated and coated with 5 wt% of potassium carbonate and 95 wt% of binder to measure the tar suppression effect, and the results were almost the same as in the case of ceramic paper.

For oil resistance, the material of sample A4 in Table 1 was immersed in kerosene for 6 months.
Continuous immersion tests were conducted, but no peeling or collapse of the coating occurred (
It didn't happen.

In addition, heat resistance was determined by heating the same material at 300°C for 8 hours.
One cycle consists of cooling at -10°C for 16 hours, followed by 100 cycles of heating (100, 200, 3
00, 400° C.) and then quenching in water was repeated 10 cycles at each temperature, but no peeling of the coating was observed in any of the cycles.

Example 2 Ceramic paper was impregnated and coated with a mixture of 10 wt% potassium carbonate and 90 wt% sodium silicate aqueous solution, dried and hardened at 200°C for 30 minutes to create a kerosene vaporization catalyst body almost the same as in Example 1, and various tests were conducted. I did it.

The tar suppression effect was good as shown in sample A16 in Table 1.

No peeling of the film was observed in the oil resistance and heat resistance tests.

Example 3 Ceramic paper was impregnated and coated with a mixture of 10 wt% potassium carbonate and 90 wt% aluminum phosphate aqueous solution,
A kerosene vaporization catalyst body almost the same as in Example 1 was prepared and various tests were conducted.

The tar suppression effect was good as shown in Sample 17 of Table 1.

No peeling of the film was observed in the oil resistance and heat resistance tests.

Example 4 Ceramic paper was impregnated and coated with a mixture of 10 wt % potassium carbonate and 90 wt % alumina sol diluted 20 times with water to prepare a kerosene vaporization catalyst body substantially the same as in Example 1, and various tests were conducted.

The tar suppression effect was good as shown in sample A18 in Table 1.

No peeling of the film was observed in the oil resistance and heat resistance tests.

Example 5 Ceramic paper was impregnated with a mixture containing 10 wt% of potassium carbonate and 90 wt% of silica sol diluted 20 times with water.
A kerosene vaporization catalyst body substantially the same as that of Example 1 was prepared by coating, and various tests were conducted.

The tar suppression effect was good as shown in sample A19 in Table 1.

No peeling of the film was observed in the oil resistance and heat resistance tests.

Next, in FIG. 1B, the kerosene vaporization catalyst 9 (
Sample A4) in Table 1 was placed in the entire bottom of the void of a pot-type kerosene stove type, and using kerosene mixed with 20 parts of diesel oil, it was continuously burned for 8 hours a day for 3 months (total burning time 75
0 hours), but there were no problems with deterioration of combustion due to tar accumulation, generation of carbon, carbon monoxide, or odor.

From the above results, the kerosene vaporization catalyst according to the present invention exhibits a tar-suppressing effect and has excellent oil resistance and heat resistance, and a pot-type kerosene stove using the same has extremely high practical value without problems caused by tanyl deposition. It is.

[Brief explanation of the drawing]

Figure 1A is a cross-sectional view of the combustion device main body of a pot stove.
FIG. 1B is a cross-sectional view of a case where a kerosene vaporization catalyst according to an embodiment of the present invention is used at the bottom of the pot, and FIG. 2 is a cross-sectional view for measuring the tar suppression effect of the kerosene vaporization catalyst according to an embodiment of the present invention. FIG.

Claims (1)

[Claims] 1. An inorganic paper containing an alkali metal oxide, hydroxide or carbonate, or an alkaline earth metal oxide,
A kerosene vaporization catalyst impregnated with one or more tar suppression catalysts selected from the group of hydroxides or carbonates and an inorganic binder. 2. The kerosene vaporization catalyst according to claim 1, which uses any one of silicates, alumina sol, and silica sol as the inorganic binder. 3. The kerosene vaporization catalyst according to claim 1, wherein an inorganic paper is impregnated with an inorganic binder containing potassium carbonate in a weight ratio of 1 to 25 as a tar suppression catalyst.