GB190102418A - Improvements in Double-tube Boilers, Evaporators, and other Heat Exchangers. - Google Patents

Abstract

2418. Noble. K. D., and Irving, J. Feb. 5. Water-tube boilers.-Relates to boilers with concentric water and flue tubes, as described in Specification No. 4831, A.D. 1895, the invention being stated to be applicable also to evaporators and other heat-exchangers. The front and back headers B, C extend upwards, and are traversed by the steam drum D, with which they communicate by means of holes as shown. In a modification, however, the steam drum extends merely between the headers. In the midst of the tubes is a combustion chamber F with fireclay slabs at its base and sides. The furnace gases, after rising among the tubes, pass backwards through the combustion chamber to the space J<1>, whence they are led through the inner flue tubes to the uptake K. In a modification, the opening H<1> is replaced by a series of small tubes traversing the back header. In the front header is an opening L, normally closed by a door ; this may be formed by a tube screwed into the plates of the header. Fig. 4 shows a method of securing the tube, in the plates of the headers. The water tubes are secured by nuts M, M', and the flue tubes by a nut N at one end and a stuffing-box N<1> at the other.