Patent GB-190020444-A (GB)
Title: Improvements in and relating to Steam Boilers and Feed Water Heaters.
Inventor: HOHENSTEIN ARCHIE GERRY
Filed: 1900-11-13
Granted: 1901-03-09
Abstract: 20,444. Hohenstein, A.G. Nov. 13. Water-tube &c. boilers; feedwater, supplying, heating, and purifying.-Relates to the construction and arrangement of water-tube boilers, and to means for supplying, heating, and purifying feedwater in connection with water-tube boilers, applicable also, with suitable modifications, for use with other types of boilers. Water-tube boilers are constructed, as shown in Fig. 1, of one or more sections, each consisting of two front headers, two rear headers, and three drums. The front headers are connected together by reversely-inclined sets of generating-tubes 5, 6, united at their rear ends, and the rear headers are similarly connected by similar sets of tubes 7, 8, crossing the others respectively. The lower front header is connected to the water drum 32 by another set of tubes 11, and the two steam drums communicate with one another by tubes 18. Downcomers 20, in two or more parts, connect the drums 16 and 32 ; they may be bolted to, or expanded in, tubular extensions formed in one 3 piece with the drums. The headers are disposed as shown in Fig. 4, so as to allow the tubes to be set in vertical planes. Several sets of tubes may be used with one set of drums, or several drums may be joined together, as shown in Fig. 4, by means of internal flanges to form an extended drum. The feedwater, in the arrangement shown in Fig. 1 is delivered, in the form of jets, into the mouths of the downcomers, at 14<a>, Fig. 1. Fig. 12 shows a tubular feedwater-heater arranged in the downcomer of a boiler of similar construction to that above described. The feed water passes downward through tubes 39, and is heated by the circulating water in the downcomer. Sediment is deposited in the leg 43, and the purified water rises through the valve 45 into the water drum 32 of the boiler. A branch 60 of the feed-pipe allows water to be introduced direct into the steam drum at the mouth of the downcomer. The head 50, from which the tubes 39 open, may be removable as shown, being pressed on the ends of the tubes to make a tight joint ; or it may be in one with the downcomer, the tubes being secured in place by ordinary means. The feed-pipe may be first passed through the front steam drum, the connecting-tube 18, Fig. 1, and the back steam drum ; and, instead of the arrangement shown in Fig. 12, the feed-pipe may be prolonged through the downcomer to the lower drum. Fig. 16 shows a modified arrangement, in which, after being heated in the tubes 39, the water rises through a tube 68, containing filtering-material, to a chamber 69 in which separated air and gases collect, and from which the water passes through valve 71 into the downcomer 20. Fig. 19 shows a further modification, applicable for use with any type of boiler, in which the rising tube 68<a> is situated within an annular nest of heating-tubes 39<a> in a casing through which the boiler water is circulated. An auxiliary heater of similar construction, in which exhaust steam is employed as the heating-medium, may be employed.