US1762180A - Boiler construction - Google Patents

Description

June 1o, 1930. P. MARQUAND j 1,762,180

BOILER CONSTRUCTION V Filed July e, 1928 4 sheets-sheet 2 F' .22. Xy

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s outside vthe gas pass which in boilers of and-J which, for the greater part of their length will he close together so as to form, asin the case of the lirst element, narrow gas passes, insuring a h10h speed of flow for the furnace gases contacting with these two groups. vThe rear boiler element in this construction is conected with the front element by tubes indicated at K connecting the outer ends of the drum H with the outer ends o f the drum El and lying preferably V this type is best made of contracting area ,5,-and 6, does not differ except in details of so as to maintain a comparatively high speed of transmission of the gases which, of course, are contracting in bulk as they are cooled down by contact with the water tubes.

The upper drums E and H are shown as connected by pipesL lying at or below the water level 1n the drums. and pipes M connecting with the steam space of the drums.

I have shown as a means for delivering feed water to the lower drum a header N extending across the top or" the flue and connected to the lower drum by a series of water tubes N1 extending across the flue and connecting with vthe drum. H1. lThis constructiony is not my invention but was invented by William l. Bradford, of Wilmington, Delaware. V L

The modification illustrated in Figures 1l,

arrangement of the water tubes from the construction illustrated in Figures l, 2, and `Thertube banks in the modification of 'Figures' 4, 5, and 6, in the ends of the front section are curved soas to form a series of banks each made up of two rows of tubes as indicated at f, g, g1; as in the ease'of the irst described modification, I do not so curve the two front rows of tubes as to make them `close together but leave them spaced, as indicated at f1, f2, so that they will receive the full radiant heat of the furnace. In the rear section of the boiler, the water tubes are so disposed as to form six closely spaced tube banks as indicated at z', l and 2, 7', il and it O and O indicate baffles which it is advisable to `use in connection with the boiler elements. l?, F ig. l, indicates the steam connection from the drum H to the super-heater vindicated at D. Q, Q, Fig. 4i,- indicate vdampers for controlling the iow of gases the gases contacting with the tubes and this is the first object of my invention.

Having now described my invention, what I claim as new and desire to secure by Letters Patent, is

l. A water tube boiler element adapted for use with a one direction transverse flow of iire gases through its tube banks comprising in combination two drums provided with tube holes spaced to leave substantial ligaments of sheet metal between them and one or more banks of tubes the intermediate and greater part of the length of which are in each bank disposed parallel to each other in spaced relation which leaves between them narrow gas passes substantially narrower than the spaces between the tube holes, said tubes having their ends spread apart and secured in the tube holes of the drums? all of the tubes in each boiler element vin the rear of the tube rows between whichvv contracted gas passages are lirst formed being disposed as described to form contracted gas passages throughout the entire depth of the tube banks. 2. A water tube boiler element adaptedA for use with a one direction transverse low of fire gases through its tube banks comprising in combination two drums provided on their opposite faces withsymmetrically disposed and evenly spaced tube holes spaced to leave substantial ligaments of sheet metal between them and a plurality of banks of tubes the intermediate and greater part of the length of which are in each bank dis-l posed parallel to each other in spaced relation which leaves between them narrow gas passes substantially narrower than the spaces between the tube holes, said tubes having their ends spread apart and secured in the tube holes of the drums all of the tubes in each boiler element in the rear of Vthe tube rows between which contracted gas passages are iirst formed being disposed as described to form contracted gas passagesflm throughout the entire depth of the tube banks. Y

3. A boiler element having the features of claim l and having disposed in front of the front bank of tubes one or more rows of

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