US1718344A - Boiler construction - Google Patents

Description

June 25, 1929 J. A. FREIDAY 1,718,344

BOILER CONSTRUCTION Filed May 27, 1924 2 Sheets-Sheet 2 III iii VA fi/c/gu Patented June 1929 BOILER ooNsmBUcTIoN.

streams,

. Applicationjfiled May 27,1924. Serial met-16, 126."

My invention aims to provide certain improve'nn-nts in boilers and particularly in boilers having water walls such as have. ben described in certain recent applicationsot' Thomas E. Murray. of which No. (378,443 will serve as an example.

The accompanying drawings illustrate an embodiment of the invention. 1'

Fig 1 is a lm'ig-itudinal section more or less diagrammatic, of a boilerto which my i-niprovement is applied;

Fig. 2 is an elevation of an auxiliary "suQ perheater shown separately from theother partsof the boiler;

Fig.- 3 is a diagram, in ele.vation,'ot a t'ubuthe CH'Cllllll'lng connections lar water walland thereof;

Fig. ,4 is a detail in cross-section.

' Referring to the embodiment of the inven-j tion illustrated, the furnace is-provided with u radiant heat from the fire bed and therefore,

stoker grates l at opposite sides ofthc furnace chamber indicated as a whole at 2 m wlnchthe combustion of the gases takes place.

' The. main boiler tubes 3 extend between headers 4 and 5; Above these are the supplementary boiler tubes 6 extending between headers pass out by the pipe 10 -to the stack.

One or more of the walls is provided with an inner water screen or wall made up of tubes 11 with lateral flanges 12 as shown in crosssection in ,Fig. 4. These tubes communicate at the upper end with a header 13 and at the low er end with a header 14. Above the drum 13 there is a mud drum 15 connected with the headers 4: by tubes 16 constituting a continuation of the water wall. The tubes 11 of the water wall lead through headers 13 and pipes 13 to the drum 9, whence'pipes 14 return water to the header 14. A very high efficiency is obtained by-the use of such a water wall. The pipes'thereof may be arranged in varipus locations and groups according to the design of the furnace and boiler.

Ordinarily superheaters for water tube boilers of the class illustrated comprise small tubes such, for example, as 17 extending across above the water tubes. The steam from the main drum 9 passes by a pipe 18 to thetubes 17, whence it passes to an outlet pipe 19 and thence to the steam engine.

, I propose, however, toprovide an auxiliary stiperheater which serves a double-purpose, the efficient super-heating of the steam and protection of the water wall headers or drums.

Such a superheater, for example, comprises a screen of vertical tubes 20 located on the inner side of the drums'13 and 15. a Fig. 2 is a View of this auxiliary superheater frornthe'outer side, omittingflthe water wall of the boiler. The steam passes'by any suitable piping, indicated diagrammatically by the dotted line121 to a header 22 on the cute side ofsthe boiler, thenceaby small tubes 23 passing through the spaces. between the'tubes 16 to thetubes'20 of-the auxiliary 'superheat-' er; thence by similar cross tubes 24 from the lower ends of the tubes 20 through the spaces between the tubesl'l' to a header 25 and out by :1. pi 16-26 totlle'point of consumption.

' T 'e auxiliary superheater is exposed to the like the water wall, is most highly efficient in transmitting heat to the steam within the tubes. Thus a .very small quantity of piping in the auxiliary superheater 'may be substituted for a consider able quantity of piping taken away from the usual or main superheate'r located above-the tubes 3 and heated passed around the tubes 3. The auxiliary heater forms also a shield partycovering the drums 13 and 15....1t1nay in fact be arranged to shield in' whole or ijt part any pipes which exposed to the air on the outside so as to itself -be protected from overheating.

Though I have described with great par- .80 only by convection by the gases which have ticularity of detail a certain embodiment of my invention, yet it is not to; be understood therefrom that the inventionis restricted to the particular embodiinentdisclosed. Va-

rious modifications maybe made by those skilled in the art without departure from the invention as defined in the following claims. -100 water wall with a top header 13 and a shield on the inner side of said 'mud drum and top I t heiider eoni-pi-ising tubes 20 extending over I -.;within" t;he"outer shell of the furnace, a shield of vertical flliid-carrying tubes over the inner side of said header, a header outside the fur-- nace and transverse tubes passing betweensaid water tubes and connecting the outside 1 header to the tubes of said shield.

In witness whereof,. I have hereunto JAY A. FREIDAY.

signed my name;

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