Patent GB-831423-A (GB)
Title: Improvements in and relating to a tubulous boiler with a radiant furnace for steam generation or for heating water or other liquid
Inventor: HOSTRUP-PEDERSEN NIELS
IPC: F22B21/34
Filed: 1956-11-12
Abstract: 831,423. Water-tube steam boilers; hotwater boilers. BURMEISTER & WAINS MASKIN-OG SKIBSBYGGERI A.S. Nov. 12, 1956 [Nov. 18, 1955], No. 34574/56. Classes 64(1) and 123(2) A water-tube boiler has a radiant furnace 1 with side walls of risers 2a and a front wall of risers 2 continuing into an upper wall of tubes 3 terminating in a steam and water drum 4, Fig. 1, which extends transversely the full width of the boiler. A vertical row of downcomer-tubes 6 extends from the drum 4 to a bottom header 7 and inclined convection tubes 14 lead from the downcomer-tubes 6 to a row of riser tubes 5 which form the rear wall of the radiant furnace 1. whilst inclined convection tubes 15 lead from the downcomer tubes 6 to a row of riser tubes 16 that project from the downcomer-tubes 6 at about the midpoints thereof, the riser tubes 5, 16 terminating in the drum 4. Each downcomertube 6 with its inclined convection tubes and the risers connected thereto form units which may be uniform throughout the boiler width or may be of two different designs, the inclined tubes being staggered half a tube pitch to facilitate the flow of combustion gases. The riser tubes 5 have fins welded to them closing the clearances between the tubes and, together with the row of riser tubes 16, which carry cover plates, and the downcomer-tubes 6 having attached cover plates 13, form a convection heating section having a downward pass 17 and an upward pass 18. A superheater (not shown) may be incorporated in the downward convection pass 17 while an economizer 20 may be provided after the convection pass 18. The lower header 7 is connected at its ends to lower side headers (not shown) which feed the side risers 2a and which lead to a front lower header 8, these headers forming a closed bed frame on which the boiler tube system is built, or the side wall risers 2a may be connected direct to the outermost tubes of the downcomer-tubes 6 while the front wall tubes 2 may lead directly from the header 7 extending over or under the floor of the radiant furnace 1. A firing opening 9 is provided in the front wall of risers 2 in which opening an oil burner may be mounted and supplied with air from an air supply box 11. One or more oil burners additional to or instead of this oil burner, may be inserted through the.side wall, or the firing may be carried out through or below the downcomer-tubes 6, or the boiler may be so raised that automatic firing apparatus can be inserted below it. In a second embodiment, Fig. 2 (not shown), the riser tubes 5, 16 terminate in the upper wall tubes 3. In a third embodiment, Fig. 3 (not shown) the row of riser tubes 16 is omitted, the inclined convection tubes 15 connecting to the riser tubes 5 so that only a single downward convection pass remains. In a fourth embodiment, Fig. 5 (not shown), the inclined convection tubes 14, 15 and the risers 16 are replaced by vertical tubes connected to the bottom parts of risers 5 and leading to upper manifolds terminating .either in the upper parts of risers 5 or in the drum 4. A vertical partition is provided to give a downward and an upward gas pass. In a fifth embodiment Fig. 6, the boiler is arranged for providing hot water only, the upper drum being replaced by a single header 34 and the feed water being supplied to the bottom of the boiler so that all the tubes leading from the lower headers function as risers.