GB190520254A - Improvements in Water Tube Steam Boilers. - Google Patents

Abstract

20,254. Loos, R. Oct. 6. Water-tube boilers.-Front and rear water chambers, which open to a steam and water drum, are connected by vertical rows of water-tubes inclined or lying in the same direction, alternate rows having different degrees of inclination so that the tubes cross each other. The arrangement is shown in Figs. 1 and 3, where the alternate rows of tubes a, b connect front and rear headers d, c, and the contiguous rows are placed close together at the point where they cross. The front header in Fig. 3 is divided at its upper part into two portions, the rear portion e of which receives the inclined tubes b and passes up into the steam space of the boiler. Slabs of refractory material conduct the furnace gases as shown by the arrows. In the case of the boiler shown in Fig. 1, the velocity of water in the tubes b, which run most deeply into the back water space c and take in the cooler water but are the first to be swept by the heating-gases, is greater than in the tubes a. On the other hand, in the boiler shown in Fig. 3, the water is forced to execute a complete circular movement from the upper drum by way of the chamber d.