GB743078A - Improvements in and relating to boiler installations - Google Patents

Abstract

743,078. Water-tube steam boilers. FOSTER WHEELER, Ltd. March 18, 1954 [March 19, 1953; Aug. 20, 1953], Nos. 7650/53 and 23021/53. Class 123(2). In a water-tube boiler intended primarily for reheating steam in a marine power plant installation which has two water drums 18, 24 connected respectively by spaced banks 16, 26 of steam generating tubes to an upper steam and water drum 20 and a furnace chamber 10 bounded on one side by the bank 16, its other surfaces being lined with further steam generating tubes, two reheaters formed as a single tube bank 28 are disposed in the space between tube banks 16, 26, the bank 16 being of considerable depth so as to screen the reheaters from direct radiation whilst allowing the degree of reheating to be varied by adjusting the furnace firing rate without unduly affecting the rate of steam generation. A superheater 22 may be disposed immediately behind bank 16 and an economizer 14 is located in the gas outlet flue 12. The reheater unit is of the form described in Specification 743,077 having two inlet headers 30, 31 and two outlet headers 32, 33 connected by U-tubes 34 which provide for identical heating paths for the two separate streams of steam. Fig. 3 shows the arrangement of the reheat boiler 48 in a two-boiler installation, the main boilers 40, 42 supplying superheated steam to turbines 44, 46 respectively, the steam to be reheated passing to reheaters 28 through pipes 50 and returning to the turbines through pipes 52. Steam generated in the reheat boiler passes through pipe 54 either to the main boiler superheaters 56 or through pipes 62 to auxiliary plant.