GB1167002A - Water Tube Boiler for Producing Superheated Water - Google Patents

Abstract

1,167,002. Water heaters. PRINCES INDUSTRIAL DEVELOPMENT CO. Ltd. 17 Oct., 1966 [3 June, 1966], No. 46266/66. Heading F4A. A hot water boiler comprises a combustion chamber lined with closely pitched water tubes 3 extending between an upper and a lower longitudinal header 1, 2 respectively. Gases from the combustion chamber pass through a convection pass 7 containing a nest of sinuous convection tubes, on their way to exhaust flue 12. Water, supplied as shown at header 13, passes upwardly through the nest of convection tubes to upper headers at the sides of the convection pass, and then down through the wall tubes lining the sides of the convection pass to the rear end of the lower longitudinal header 2. The water then flows upwardly, downwardly and upwardly again through the tubes lining the combustion chamber on its way to an upper front outlet, due to the insertion of upper and lower partitions 28, 29 in the upper and lower headers 1, 2 respectively. An air vent 30, safety valves 32, 33 and a drain 31 are provided in the headers near the partitions. The boiler is surrounded by a casing comprising outer iron sheets, a layer of insulating material, and a further skin casing attached directly to the wall tubes, and is mounted on a bed plate. The nest of convection tubes is supported from the vertical wall tubes lining the convection pass, lugs welded to the former resting on corrugated support strips secured to the latter at vertically spaced locations (Figs. 5 to 7, not shown). In a modified water flow arrangement in the convection section (Figs. 10 and 11, not shown) water from an upper inlet flows downwardly through the vertical wall tubes lining the convection section, into a rear portion of the lower longitudinal header partitioned off from the rest, and then up through the nest of convection tubes to two upper headers which discharge into the portion of the lower longitudinal header at the rear of the combustion chamber.