GB702215A - Liquid fuel burner - Google Patents

Abstract

702,215. Spray-producers. POWER JETS (RESEARCH & DEVELOPMENT), Ltd. Oct. 1, 1951 [Oct. 9, 1950], No. 24640/50. Class 69 (3). [Also in Group XI] A liquid fuel burner, particularly for viscous fuel, wherein the fuel is atomized by a stream of air, steam, or other gaseous fuel, comprises a body 1, Fig. 1, formed with an internal longitudinal bore 4 terminating in an orifice 5 in an end face of the body 1, a casing 2 surrounding the body 1 and including a wall extending across and spaced from said end face and having an orifice 6 aligned with the bore 4 to form together an atomizing gas blast passage, said end face and wall defining a transversely extending annular gap around the gas blast passage for leading fuel thereinto to be atomized, and the body 1 and casing 2 being formed with transversely extending locating faces facing and in fixed relationship to each other whereby the width of the gap 11 is positively determined. The locating faces may comprise as shown an end surface of the casing 2 and a surface of an end flange on the body 1, and spacing shims 20 may be introduced therebetween. The atomizing fluid is swirled within the bore 4 by a swirl plug 9 which has a perforated head for the passage of atomizing fluid, supplied through a union 8 screwed into the body 1, and is held against a shoulder within the latter by a spring 10. The casing 2 has a fuel inlet 12. In an alternative construction the swirl plug 9 is replaced by a thin pintle mounted similarly to the plug and having a conical diverging head extending beyond the discharge outlet so as to assist in forming a conical spray. Either construction may be modified by providing the orifice 11 between two parallel conical surfaces so that the fuel flows obliquely downstream into the atomizing fluid blast. Alternatively the end of the body 1 may have a slightly conical recess and the inner surface of the casing 2 a corresponding raised cone formation. The orifice 11 may also be convergent. In another construction the body 1 is not screwed into the casing 2 but is retained in position by a lock-nut, whilst the swirler 9 is held in position by means of sleeves within the body 1. The outlet end of the body is conically tapered and the casing 2 recessed to a lesser extent to form an inwardly tapering fuel passage, the width of which is adjustable by the interposition of a ring and, if necessary, of shims between a perforated flange on the tube and a shoulder at the end of the casing 2. In a further construction the body 1 is formed with external radial ribs which locate it within the casing 2, the swirler 9 being screwed into the body 1. According to the Provisional Specification either the fuel stream or the atomizing jet or both may be swirled.