Patent GB-625309-A (GB)
Title: Improvements in or relating to vapour generators
IPC: F22B37/20
Filed: 1947-03-14
Abstract: 625,309. Furnace walls. BABCOCK & WILCOX, Ltd. March 14, 1947, No. 7121. Convention date, March 14, 1946. [Class 51 (i)] [Also in Group XIII] In a steam &c. boiler having a furnace chamber 19, Fig. 2, of substantially rectangular cross-section and a laterally adjacent convection space 18 which is separated from the said chamber by a partition or tube wall, not shown, and locates steam-generating tubes 42 extending from a lower water drum 41 to an upper steam-and-water drum 39, the assembly is supported by a structural frame comprising essentially columns 59, 61 which are disposed along opposite sides of the lower part of the chamber 19 and are tied by horizontal front and rear members 56 and like side members 57, 58. As shown, Fig. 3, the water drum 41 is mounted above the side member 57 through end saddles 62, 63 which are secured to the drum and are, respectively, fixed and roller supported upon said member 57, so as to permit longitudinal movement of the drum relative to its fixed front end, and, at about the level of the centre line of the drum 41, the tubes of the three walls of the furnace chamber, also of the partition between this chamber and the convection space, are tied by bars 71, 72, 73, 74 and supported by the front, rear and side members 56, 56, 58 through pivoted columns 101 and buckstays .78, 79, 80, 81, the buckstay 78, 79 on the front wall 12 being in two separate parts to locate burner openings 28. In the case of the side wall 14, for example, the tie bar 74, Fig. 13, is welded to a tie plate 83 secured by bolts 89 to the buckstay 81, the latter preferably comprising upper and lower channel members arranged back-to-back and held together by the said bolts 89 and the holes in the tie plate 83 for the bolts 89 being slotted parallel to the wall 14 to allow relative longitudinal movement between the wall and buckstay. Fig. 13 also shows a column 101 of T cross-section which is connected, at its lower end, by a pin 102 to upstanding lugs 103 of a base plate 105 mounted on the frame member 58 and, at its upper end, by a pin 108 to spaced plates 109 welded to both the tie bar and plate 74, 83, some clearance being provided between the pins 102, 108 and their respective holes. The tie bars 71, 72, Fig. 3, are secured to the tubes 12a of the wall through channel-section spacers 75 adapted to receive refractory material, and the bar 71 and also that 73 of the wall 13 are tied to angle plates 96 welded to the ends of the drum 41. The tie bars for adjoining walls are also welded together at the corners 76, and the several buckstays are connected at these corners. by gusset plates 84 through bolts, etc. 94a, 95a and slotted holes 94, 95, said gusset plates being welded at 85 to adjacent tie bars. The furnace tubes 170 which line the furnace chamber opposite the wall 14 are tied together and to the lower drum 41 by a tie-bar channel 45 welded to the tubes 170 and carrying spaced plates 47 bolted to plates 48 welded. to the drum, and the upper ends 17a, Fig. 9, of some of these tubes, namely those constituting the partition between the chamber and the convection space, are tied by a corrugated bar 145 which engages threaded studs 146 welded to said tubes and is secured to the front wall part of a second tie-bar and buckstay assembly 65 which is located at a level between the two drums 39, 41, is continuous about the entire upper cross-section of the setting, and is supported solely by the several wall tubes.