US1640178A - Boiler construction - Google Patents

Description

g B. N. BROIDO BOILER CONSTRUCTION Fil ed April 1. 1925 2 Shets-S'neet 1 INVENTOR BEM/HM/A/ ALB o/oo ATTORNEYS g Aug. 23, 1927.

B. N. BROIDO BOILER CONSTRUCTION Filed April. 1, 1925 2 Sheet's-Sneet' 2 00o000000000000000000000 000000000000000000000000 /000000o o000oo0 o00o0o0ooo /00000o000000000000000000 /O O O O O OO O 0.0 O O O O O O0 0O OO O O O/ o 0 0 0 0 M10 m o M 0 0 0 0 0 o o o o 0 0 0 0 0 0 0 0 0 0 0 0 0 0 o o o o o o o 0 0 0 0 0 0 0 0 0 0 0 o o 0 0 0 0 0 0 0 o 0 0 o 0 0 0 0 0 0 o 0 0 000 0 .0 0 0 0 0 o 0 0 o 0 o 0 0 A0 0 00 o 0 00 o \fl 00o000000000000000000000 000000000000000000000000 /o0o00000ooo0000000000000 0000000000000.00000000000 ll 2 m INVENTOR Patented Aug 23, 1927. V UNITED STATES 1,640,178 PATENT OFFICE.

BENJAMIN N. BROIDO, 01 NEW YORK, N. Yi, ASSIGNOB TO THE SUPEBKEATEB COI- PANY, NEW YORK, N. Y., A CORPORATION 01 DELAWARE.

1301mm conSgrnucnon.

Application filed April 1, 1925. Serial No. 19,807;

In the construction of the well known Stirling type water tube boilers, having a plurality of separate banks or passes of water tubes of equal diameter, it is the 5 standard practice to provide-the same number of tubes in each transverse row throu hout all the passes, and to arrange the tu es in each transverse row in pairs. The space between adjacent pairs is just sufficient to u, allow the ready removal or replacement of a tube at any part of the boiler, while the space between the tubes of each of. said pairs is much more restricted As the modern development of the steam u; boiler is towards the general adoption of super-heat much higher than heretofore employed, it becomes necessary to place the superheater units comparatively close to the furnace and preferably between the water 2o tubes of the first bank but because of the restricted space between the water tubes of ,the Stirling type of boiler, the use of high superheat with "this type of boiler presents many difliculties among which the following may be noted: in the first place, the

mechanical difliculties in assemblin and installing; secondly, after the super eater is installed, the restriction of the gas areathirdly, 1 the tendency of flue dust and to ashes to collect in the spaces between the superheater units and water tubes and thereby impair the eflicienc of the'boiler; and fourthly, the impracticabilit of increasing the spacing between t e tubes which would result not only in unduly increasing the gas area, but would require a much larger floor space for the boiler and also greatly increase the cost of manufacture.

A It is the principal object of this invention to provide a new and improved construction and arrangement of a Still? type 'boiler by means of which the d cultles Q above enumerated are overcome.

Other more specific objects will be apparent to those skilled in the art to which this invention relates from the following description. o

In the drawingswhich illustrate an example of my invention without defining its limits, Fig. 1 is a vertical section through a water tube boiler of the Stirling type and Fig. 2 is a section taken substantiall on the line2 2 of Fig. 1 looking in the 'rection of the arrows.

As shown in the drawing, the boiler indicated generally by the numeral 10 is provided with a furnace 11 from which the gases flow through the boiler to the outlet 12, which is adapted to be connected with '60 a suitablev stack. In accordance with the usual constructions of boilers of this type a plurality of banks or passes 13, 14 an 15 of water tubes extend in a substantially vertical direction and connect the upper steam drums, 16, 17 and 18 with the lower water drum 19; bafile walls 20 and 21 being provided to cause the ases to flow across the tubes in the longitu inal direction thereof. As shown in Big. 2, the spacing of the tubes in each of the banks 14 and 15 is similar; each of said banks being provided with an equal number of rows of tubes transversely of the boiler in accordance with the standard practice. The spacing of the 76 tubes of the front bank 13 is greater than in the remaining banks, thisbeing accomplished by providing a smaller number of tubes in the transverse rows of said front bank. In the example illustrated, 24 rows 30 of tubes are rovided in each of the banks 14 and 15, w ile only 20 rows are provided in the bank 13. By eliminating a number of rows of Water tubes in the first bank 13 I am enabled to provide sufiicient spacebe- 35 tween the tubes to permit the installation of the superheater units 23 .without crowding the tubes and units too close together, thereby overcomin the difficulties enumerated above, wh e at the same time the 9 overall width of the boiler is not increased and the effective area of the gas passage I in the first pass is maintained substantially bined cross-sectional area of, the boiler tubes and superheater elements which pass through said plane.

As there is a marked tendency towards the adoption of boiler pressures many times higher than those heretofore generally employed, the problems due to the eat stress placed upon the drums, and particularly the tubes transversely of the boiler spaced apart drums of the first bank which are subjected to temperatures sufficiently high to affect the strength of the drum material, become quite difiicult. The construction herein disclosed, because of the greater s ace provided between the tubes of the rst bank, thereby increasing the size of the digament between the tube apertures in the drum, and the protective influence of the superheater units interposed between said tubes, therefore possesses the further advantage over the standard construction of being exceptionally suitable for super-pressure boilers.

It will be understood that the number of rows and the arrangement of the tubes in each bank as shown in the drawings. is merely illustrative and that changes, variations and modifications may be resorted to without departing from the spirit of my invention.

I claim:

1. In a water tube boiler, a furnace, said boiler having a lurality of banks of water tubes located at ifierent distances from said furnace, the first bank of tubes nearest to the furnace having a smaller number of rows of at greater distances than the remaining banks, and a plurality of superheater units extending downwardly into the boiler between the tubes of the first bank, the effective area of the gas passage formed in said first bank between the superheater units and the water tubes of said bank being 'no less than the effective area of the gas passage of each of the remaining passes.

2. In a water tube boiler of the Stirling type, a furnace and a plurality of banks of water tubes located at different distances space between t from said furance, each of said banks of' tubes comprising a plurality of rows of tubes arranged 1n non-staggered parallel relationship and s aced transversely to permit the removal 0 tubes between certain adjacent rows, and a plurality of superheater units extending downwardly into the boiler between the tubes of the first bank nearest to the furnace, the tubes of said first bank being similarly spaced throughout the entire bank but at greater distances apart than in the remaining banks to provide sufficient space between said superheater units and tubes to avoid unduly restricting the effective passage for the furnace gases and clogging of flue dust and ashes between said units and tubes.

, 3. In a water tube boiler of the Stirling type, a furnace and a plurality of banks of water tubes located at different distances from said furnace, each of said banks of tubes comprising a plurality of rows of tubes arranged in 'non-staggere'd parallel relationship and spaced transversely to permit the removal of tubes between certain adjacent rows, and a plurality of rows of superheater units extending downwardly into the boiler in the transverse spaces between adjacent parallel rows of tubes of the first bank nearest to the furnace, the tubes o said first bank being similarly spaced throughout but at greater distances than in the remaining banks, there being a clear e furnace and those super-v heater units of each row which are nearest the furnace.

In testimony whereof I have hereunto set m hand.

y BENJAMIN N. BROIDO.

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