GB555583A - Improvements in or relating to liquid fuel burners - Google Patents

Abstract

555,583. Liquid-fuel burners. BABCOCK & WILCOX, Ltd. Feb. 25, 1942, No. 2475. Convention date, March 1, 1941 [Class 75 (i)] Liquid-fuel is discharged into a furnace through an orifice 16 in a plate 62 formed with a cylindrical body 68 to provide a whirl chamber 70. The fuel is supplied to the whirl chamber through a series of tangential ports arranged in successive transverse planes A, B, C ... L, Fig. 4, the two ports 92 arranged 180 degrees apart in the plane A being always open and the ports 96, 98 in the planes B, ... L being successively uncovered by the movement of a plunger 80 against the resistance of a spring 170 as the pressure of the fuel increases. The ports in each of the planes B ... H are displaced 90 degrees from and overlap axially the ports in the succeeding planes so that a continuous variation of the effective port area and the depth of the whirl chamber is obtained by the movement of the plunger. The plate 62 is secured by a threaded cap 64 to a barrel 30 screwing on the burner body 38 which is clamped by a bolt 56 in a pivoted yoke 38 to a support 18. The fuel supply is regulated by a manually or automatically operated valve 60. The tension of the spring 170 may be adjusted by a nut 206 screwing in a nut 200 on the body 38 after removal of a cap 212. A bellows 172 connects the seating member 180 on the plunger for the spring with a ring 194 clamped by the nut 200 to the body 38. An impeller plate 14 for directing air on to the atomized fuel is carried by a tube 12 screwing into the support 18. A spring-pressed ring 24 prevents air leaking through the space between the tube 12 and barrel 30. The loading pressure on the spring 170 may be such that the effective port area remains at its minimum value as the fuel pressure increases from an initial value of 50 lbs. per sq. inch to about 40 per cent. to 60 per cent. of its maximum value of about 250 lbs. per sq. inch. Fig. 8 shows another construction in which the tangential inlet ports 144 leading to a whirling chamber of constant capacity are successively uncovered by a sleeve 103 operated by the plunger 82, at least one port being uncovered when the face 142 of the body carrying the sleeve 103 abuts against the end of the whirl chamber body. An additional orifice plate 146 having an orifice 148 of the same or different dimensions from the orifice 16 is provided between the plate 62 and the whirl chamber to minimize the dispersion of the fuel particles outside the fuel spray cone. In a modification of the operating mechanism the pressure of the fuel is communicated to the space inside the bellows. The Specification as open to inspection under Sect. 91 comprises a construction shown in Fig. 9 (Cancelled) in which the effective port area is increased as the plunger is retracted by the sleeve 103 being formed with holes 164 leading to an inner circumferential groove 168 surrounding the ports 160 in the whirl chamber. It also stated that the plunger might be operated manually instead of by the fuel pressure. This subject - matter does not appear in the Specification as accepted.