GB189818142A - Improvements in Water-tube Steam Boilers. - Google Patents

Abstract

18 142. Thompson, W. P., [Stevens, J. A.]. Aug.23. Steam-generator furnaces.-Relates to land and marine boilers with inclined, or both inclined and vertical, water tubes. There are three steam drums and two water drums arranged longitudinally. In the arrangement shown in Fig. 2, these drums are connected by inclined generating- tubes, and by downcomers, not shown, at each end. The steam drums are connected together by pipes 6, 6<1>, and the spaces between them are covered by arches 7, 7. Flame bridges or baffles 8, 8 occupy the spaces between the two banks of inclined tubes on each side, and baffles 9, 9 extend downwards outside the outer banks of tubes. The steam drums are supported by hangers 31, 31. The water drums rest on hollow supports which, like the lower part of the transverse division wall, are formed with passages for the supply of air under forced or natural draught to the furnace, and fitted with doors. Air passages opening above the grate are formed also in the front and back walls. A transverse wall divides the furnace chamber into two separate parts, and a central longitudinal wall may be provided to further divide each of these parts into two. These walls may be formed of refractory material with water tubes embedded therein, of water legs and connecting water boxes, or of water tubes the spaces between which are filled with tiles. These water tubes or water legs connect the steam and water drums. Bridge walls 14<1> protect the inner banks of tubes from the fire. When the central longitudinal wall is used, a third water drum of smaller dimensions is located beneath it. In modified arrangements, the outer banks of water tubes are vertical. The course of the furnace gases is indicated by arrows.