Patent GB-1030291-A (GB)
Title: Improvements in and relating to cyclone furnaces
IPC: F23C3/00
Filed: 1963-02-18
Abstract: 1,030,291. Burners. BABCOCK & WILCOX CO. Feb. 18, 1963 [Feb. 21, 1962], No. 6415/63. Heading F4T. A burner for a cyclone furnace includes a cylindrical whirl chamber 25B, Fig. 4 (not shown), a duct 59 supplying air tangentially to the whirl chamber 25B, a duct 69 supplying powdered coal to the whirl chamber and angularly spaced from the air duct 59 by 90 degrees and a further air inlet 57 for tertiary air at the axis of the whirl chamber and in front of the fuel duct 69. The coal duct 69 enters the whirl chamber tangentially. Secondary air is supplied tangentially to the combustion chamber 14 of the cyclone furnace, into which the burner discharges. The tertiary air inlet 57 is an aperture in a circular plate 56 which subdivides the space within the cylindrical casing 26 of the burner to form the swirl chamber 25B and a tertiary air chamber 25A. The duct 59 is divided by a partition and also supplies air to the tertiary air chamber. The primary air and the tertiary air flows in the duct 59 are controlled by dampers 62B, Fig. 3 (not shown), mounted on shafts 63 manually adjusted by worm gears mating with worm wheels on the shafts 63. The inner surface of the whirl chamber is lined with wear blocks 27 having arcuate inner surfaces, so formed that the leading edge of one block projects radially outwardly further than the trailing edge of the next block. The casing 26 is enclosed by an outer cylindrical plate 29 and water circulates in the space between the two casings. The outer end of the easing 29 is closed by a hinged cover 34 to which the aperture plate 56 is secured by rods 58. The hinge assembly for the cover 34 comprises pairs of aligned lugs 38, 39 secured to the cover and to the cylindrical casing 29; each lug 39 is pivoted to a member 44 pivoted to a member 42 pivoted to the lug 38. Vertical bars 46 extend between the pairs of members 42, 44. The hinge assembly permits axial movement of the cover in the initial stage of opening. A circular plate 48 is mounted on the inside of the cover and water is supplied to the space between the plate 48 and the cover by a pipe 52 and flows therefrom through a pipe 53. An opening fitted with a blind flange 55 is provided in the cover for the insertion of an oil or gas burner. An inspection port 54 projects through the cover and plate 48. The combustion chamber 14, Fig. 1, of the furnace comprises a circular boundary wall formed by two sets of closely spaced studded semi-circular steamgenerating tubes 15 covered by refractory material and springing from two interconnected supply headers 16. The upper ends of the tubes are connected to two interconnected upper headers. The outer end of the combustion chamber is formed by a plurality of spaced circular studded tubes 18 connected to headers 19, 20 connected to the upper header 17. One set of semi-circular steam generating tubes are bent outwardly to form a port 22 into which a secondary air-supply duct 24 is connected. The duct is sub-divided vertically to form longitudinal apertures provided with dampers. The inner end of the combustion chamber is in the form of a re-entrant throat 72 and is fluid-cooled. A slag outlet 73 is provided below the throat 72.