Patent GB-190702880-A (GB)
Title: Improvements in Water-tube Steam Boilers.
Inventor: COCKBURN SIDNEY MANTHORP
Filed: 1907-02-05
Granted: 1908-02-05
Abstract: 2880. Cockburn, S. M., Temperley, J. R., and Temperley, J. Feb. 5. Water-tube boilers; feed-water, heating; headers; evaporative efficiency, reversing.-Relates to watertube boilers in which the steam-generating tubes are fitted with steam-extracting pipes as described in Specification No. 22,267, A.D. 1903, and consists principally in means for progressively heating the water in a modified manner as compared with the means described in Specification No. 22,663, A.D. 1903. The boiler shown in Figs. 4 and 5 comprises three sections : a feed-heating section k<1> into which water is pumped at boiler pressure, a steam-generating section M provided with steam-extracting pipes f, and an intermediate or 'adjuster' section J which opens into a passage j<2> leading in a downward direction to the generating-section and in an upward direction to the steam space of the boiler. The boiling of the water is completed in the intermediate section, and any steam that is generated is led directly to the steam space. The feed-heating section consists of a series of nearly horizontal tubes opening into horizontal partitioned headers k, which are connected by short tubes as shown. Successive tubes are connected by U-shaped pieces k<2>. The ends of the tubes may be closed and placed in communication by means of U-shaped connectors passing through the length of the tubes. In modifications, the feed-water enters an horizontal trunk at the bottom of the heater, which opens into the drum at its upper end. In one such modification, the heater consists of a series of inclined tubes, which are closed at one end and open at the other end into vertical headers connected by short tubes to the bottom of the drum. The horizontal or nearly horizontal tubes m<1> in the generating-section open into a series of back and front horizontal trunks m<2>, of which the front trunks communicate with each other and with risers j<3> leading to the steam drum C'. The front trunks may be formed in one piece. Vertical headers b, Fig. 1, may be employed, the back headers being closed at the top and the front headers carrying risers b<3>. Part of the generating-section may form the side, back, or partition walls of the furnace. The tubes n<2> forming the walls of the furnace open into water legs n<1>, which communicate with the headers of the section M, and.receive the water from the down-cast pipes n. The tubes n<2> are, in all cases, provided with steam-extracting pipes f. The back water-wall . may be formed of pockets q, Fig. 13, suspending from the trunks m'. In this case, the steamextracting pipes f<2> are extended into the pockets and are provided at intervals with conical pieces f<3>, which guide the steam to the perforations in the pipes. The steam-extracting pipes may enlarge in bore towards the ends which are joined to the ascension pipes f<1>. The trunks and headers are formed with wavy profiles, and are so spaced as to permit of the insertion of a cleaning-tool or brush. The boiler may be provided with a superheater placed between the feed-heating section and the intermediate section.