Combustion – Fibrous wick type flame holder – Coated – impregnated – layered – coupled or reinforced wick
Patent
1985-03-07
1986-02-11
Scott, Samuel
Combustion
Fibrous wick type flame holder
Coated, impregnated, layered, coupled or reinforced wick
431298, F23D 318
Patent
active
045696560
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE TECHNOLOGY
The present invention relates to a wick for liquid fuel; burners for the combustion of liquid fuels, such as kerosene, and more particularly it relates to a wick for liquid fuel burners which has high durability to liquid fuels of inferior quality and also has superior strength.
BACKGROUND OF TECHNOLOGY
Conventionally, a liquid fuel burner wick of this type, as shown in FIG. 12, is adapted for use by being vertically movably fitted between inner and outer guide sleeves B and C protruding from the fuel tank A of the burner, said wick being held in a raised position as shown during burning, with the upper exposed portion thereof allowing the liquid fuel to evaporate for combustion. This wick D generally comprises a combustion part, consisting of woven fabrics E and F mainly of glass fiber, and a draw-up part consisting of a woven fabric G mainly of cotton and staple fiber, said parts being sewn together end-to-end.
The most serious problem with this wick D is that a tarry material is formed on the wick, to make manipulation of the wick for vertical movement impossible and/or producing deterioration of combustion (failure to burn). Most frequent cause thereof is that the kerosene which is used as the liquid fuel has been oxidized and rendered liable to form tar. Other causes include contamination of kerosene with foreign oils, such as salad oil or light (Diesel) oil, and dispersions of the boiling point of kerosene itself.
In this connection, JIS (Japanese Industrial Standards) kerosene No. 1, called good-quality kerosene, has been used today as a liquid fuel for kerosene stoves and the like, and the 95% distillation temperature of said kerosene as determined by distillation test is nominally below 270.degree. C. and actually about 240.degree. C. in most cases; it is sometimes as low as 220.degree. C. and sometimes as high as about 260.degree. C., a difference of about 40.degree. C. Further, the manner of formation of tarry material correlates with the boiling point (for which 95% distillation temperature is substituted) of the fuel, and it has been found that a kerosene which has a distillation temperature of 260.degree. C., even if not deteriorated, tends to result in an undesirable formation of tarry material. On the other hand, the worsening of the present condition of oil supply is threatening a danger of impeding the supply of said kerosene No. 1 to such extent that such a proposal has been advanced as to alter the JIS to change the 270.degree. C. to the 280.degree. C. as a countermeasure, so as to allow extraction of a greater proportion of kerosene with the intention of filling the gap between supply and demand, thus, the present situation is such that one cannot but admit that a trend toward change from lighter to heavier fuels is proceeding step by step.
When the wick D in FIG. 12 with the combustion part made mainly of glass fiber is used with the kerosene of inferior quality described above, the combustion part can hold only such a small amount of oil as to become unusable in a relatively short time.
A careful study of the process of formation of tarry material has shown that a wick which can withstand the use of kerosene of inferior quality is one whose combustion part holds a relatively large amount of oil and is at low temperature, in which case even when tarry material is formed, it is relatively soft and small in amount so that the tar is allowed to dissolve in the abundant kerosene, and is diffused toward the bottom of the wick D.
Therefore, it is enough to increase the oil content of the combustion part of such a wick D, and an approach can be adopted in the case of the conventional wick D mainly of glass fiber, such as to minimize the distance from the kerosene level to the combustion part, i.e., the draw-up height of the wick D, whereby some effect can be attained; but, this method can be actually employed only for new products, and can not be embodied for burners which have been sold in the past; further, decreasing the distance from the oil level to the combu
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Katsuragi Noboru
Nakano Kazuhiro
Shimizu Hideharu
Matsushita Electric - Industrial Co., Ltd.
Price Carl D.
Scott Samuel
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