US1614948A - Water-tube boiler - Google Patents

Description

WATER TUBE BOILER Jam.

Filed May 8. 1926 Patented Jan. 18, 1927.

immun c. nsmts,

on CLEVELAND, omo.

WATER-TUBE MEER.

Application tiled May 8, 1926, erialv No. 167,607.

Line invention relates to water tube boiler constructions, and particularly to the vertical types, known' as the Stirling and Connelly, Heine and others. The best known of these boilers employ a bottom drum. and three spaced upper drums with a set of tubes extending from the .bottom drum to each up er drum, but in some cases, .there are on y two up r drums and two banks of 2 0 tubes. The invention has. to do primarily with the baille arrangement, which involves a radical departure from the established i factice in boilers of the vertical type. lleretoforait has been customary to ar- 15' range the bellies, so that 'the gases of combustion in the various banks of'tubes travel, in the main, longitudinally, and therefore, parallel to the tubes, making relatively sharp vbends adjacent the ends of the tube 2 0 bunks. In the present construction, the baflles are so arranged so that the gases of combustion cross the various banks of tubes at ysubstantially right angles thereto. This arrangement reduces the sharpness of'thereil@ versals or bends which the gases of combustion' must make, in moving from one pass to the next, and thus improvesxthe draft' conditions. The arrangement alsofresnlts 1n an increase in area of .the availablehcating W vsurface in the first and second passes where the temperatures are higher, thus increasing the Heaty absorbing capacity of the apparatu's vand reducing stack temperatures. A `further featureof construction, involving a so departure froni'previous practice, and giving a higher efficiency, is the 'arrangement o' the bellies 'so that the net cross sectional area in the passes from the first to the last gradually decreases,ftollowingiin a measure, en the law of contracting gases due to cooling. The velocity of the gases is thusp'revented from being reduced, as would otherwise be" the case, if the reduction 'in cross sectionalY area did not occur, and I have found that in this feature of construction; tending to pref vent any reduction inthe velocity. of transit of the vases throughoutfthe heating' passage-l Way o? the boiler, adds substantially to its efficiency. A further object attained is a no larger net area or clearance spaceu'gbetween the tubes at the various' passes, suchareas' being in all cases greater than 'the damper.'

areas so that the draft losses at 'the'passes is reduced to a minimum. One embodiment su of the invention is illustrated in the accom panying drawing, wherein:

The ti nre, is a vertical section through a water-tu e boiler constructed in accordance with my invention. f y i Referring to the drawing, l, 2 and 3 are i Milln 'ikv the'upier drums of the boiler, ande is the lovver4 the three banks of tubes 5, 6 and 7. The

upperdrums are connected by the usual sets.v f

tubes 8 and 9. y

- In the particular construction shoiwm'the. l

rum, such drums being connected by libiler is fired with gas by means of 'the burners l0, l0, which direct the gas from y the main, mixed with air into the' resbox 12, but it will be understood that the boiler may-be provided with the usual hand fired; '.grates orwith automatic stokers located,-= r eIther on vthe lefthand side of theesetting,vr

or on the right vhand side, and redwitlr.

powdered coal or oil, the invention not being' vlimited as toy this detail of'construction, al-

though the one shown is preferred. Follow#T lug the usull Practice, the-side ofthe coni structionion whichv the gases of combustion firstA pass the tubes, will Vbeneferredato' as -50 ythe front iside, and theother. sicletleft).4 on

.which the outlet lue 14 is located )vill be referred to as the rear side,the banks or sets 'of tubes and drumsbeing correspond-'f` ingly designated. Thers ace l2intogivhch` the burners are directe will'be referred to as the irebox, although the space' l11' ltof i vthe right, is in a measure a continuation"` of" such lor stack 14.

re-box, the upper side being"formed, by theire brick arch 13. The space abc'nley 1 the arch 13 leads' upwardly toltlireoutzlet'tlue j The flow of the gases offcomusooss 'r the banks, or sets of lire tubes 7 Gf and f5 its.

governed'and directed Yby a pair of battles,

vwhich. constitute an important'felature" otrny i* the upper section 16 extends transversely.

invention.- .'Tlieriglit hand baille is iiiale''fA up of tvvo'sections, the I'lower sectionlex-fjy yloo i of 'theltubes 7 and 6,. so that'the gasesof combustion swee across. the vupper portions and flow downwardly land' to `-the rear. f

The, left'hand baillel coinprises an upright '.sectionl'? extending'lontudinallygiof Athe .f

upper portion of the Iban bf tubess, 'and downwardlyfand to the right across both sets of tubes 6 a'iid 7, after which they turn to the left again, passing across the tubes 6 and 5 and upward to the stack. The baffles are preferably composed of suitable reinforced plasticmaterial and extend continuously across the entire setting.

The baflles are preferably arranged so that the net areas at A, B, C, D and E provide an orifice Lor passageway for the gases of combustion, which gradually decreases in cross section, corresponding approximately to the decreased volume of the gases incident to their shrinkage in cooling. The velocity of the gases throughout the passageway is, therefore, maintained substantially constant, vor speeded up somewhat, which is a condition found to compared with a condition in which the velocity of the gases slows down as they pro" gress through the various passes. The net cross sectional areas of the passes, as compared with the damper area, is such that proper draft is insured.

The advantages incident to the baille arrangement has been already set forth, heretofore, and include improved draft conditions and increased heat absorbing qualities, so that the arrangement materially increases the ratin of boilers to which they are applied. T e bends at the ends of the passes are also more gradual` and there are no contractions in cross sectional area in the various passes to a point below that of the damper or flue area, or any dead spaces in which gases are not in motion, so that the draft conditions are favorable. 'lheavailable heating surface in the first and second passes, where the temperatures are highest 1s relatively large as compared with .previous arrangements, which increases the heat ahsorbing capacity-of the boiler and gives lower stack temperatures. The gradually decreased cross sectional area of the conduit or passageway for the gases of combustion also results in improved economy of operation for the reason heretofore pointed out. There are no spaces for the collection of soot, which are not readily accessible, and the baffle cost is far below that incident to baflles of the usual type as employed in boilers of the character specified. The location of the baille section 15 in the bank of tubes 7 involves an advantage, as the portions of the tubes to the right of the section, are thus exposed to and receive the full benefit of the radiant or reflected heat from the opposite wall 19 of the combustion chamber,

while the tubes to the left of this section 15 which are too far in to receive any substantial benefit from the reflected heat from the wall 19, are exposed to` and given the benefit of, the heated gases of combustion as they sweep along and across the tubes in making the turn. The reverse curve of the give improved efficiency as across and alone'the upper portions of the tubes 5 at the right of the baille section 1'?,

provides for a large heat transfer to the 'tubes at this point. cident to the construction will be readily apparent to those skilled in the art.

What I claim is:

1. In combination in a boiler of the ver tical type having a lower drum and three spaced upper drums and three sets or banks of water tubes extending upward from the lower drum to the upper drums, a fire-box beneath the boiler, an outlet flue or stack at the rear of the boiler, the lower drum longitudinally of the tubes` of the first bank for a portion of their length and then transversely of such tubes and across the middle bank of tubes, and a sec-` ond baille extending downwardly from the upper rear drum for a portion of the length of the rear bank of tubes, and then laterally across the lower portion of the middle bank of tubes.

2. In combination in a boiler of the vertical type having a lower drum and three spaced upper drums and three sets of banks of watcr'tubes extending upward from the lower drum to the upper drums, a fire-box beneath the boiler, au outlet flue or stack at the'point where the gases leave the tubes, a baffle extending from the lower drum longitudinally of the tubes of the front a portion of their length vcrsely of such tubes and aerossvthe middle bank of tubes, and a second baffle extending downwardly from the upper rear drum for a portion of the length of thc'rear bank vof tubes,- and then laterally across the 4lower portion ofthe middle bank of tubes, the" two baflles being located so as to divide the middle bank of tubes into three sections of increasing length .from the bottom section up.A

3. In combination in a boiler of the vertical type having a lower drum and three spaced upper drums and three sets or banks of water tubes extending upward from the and then trans- .lower drum to the upper drums, a fire-box` Other advantages inbank for curve of the gases 'lil' a baffle extending from beneath the boiler, an outlet flue or stack at a point where the gases leave the tubes`abafflev extending from the lower drum lon itudinally of the tubes of the front bank igor a portion of their length and then trans` versely of such tubes and across the middlebank of tubes, and a second baille extending downwardly from the upper rear drum for 'a portion of the length of the bank of tubes,

and then laterally across the lower portion of the middle bank of tubes, the two baflles being located so as to divide the middle4 bank of tubes into three sections, and the portion of the baille which extends longitudinally of the front bank of tubes bein located inside i the bank between the rear tu e of such bank and the front tube thereof.

4, In combination in a boiler of the vertical type having:r a lower drum and three spaced upper drums and three sets or banks ol. water tubes extending upward from the lower drum to the three upper drums, an arch and liresbox, and battles for directing the gases of combustion, first, clear across the upper ortous of both the front and middle ban s of tubes, and into the rear bank, second, backwardly across the upper portion of the rear bank of tubes, across the entire center bank of tubes and into the lower portion of the tubes o/the first bank, und third, turning in the lower part of the tubes of the front bank forwardly across the lower portions of the middle and rear banks of tubes and to the stack.

In combination in a boiler o the vertical type having a lower drum and e pluralit. of spaced upper drums and a setor bank or water tubes extending upward from the lower .drum to eaco of the upper drums, a fire box beneath the boiler, an outlet flue or stuck at the oint where the gases leave the tubes, a ba'. e extending from the lower drum longitudinally of the tubes of the front bank for a portion of their length and then transversely of such tubes and across the middle bank ot' tubes, and a second baille extending downwardly from the upper rear drum for a portion of the length of the rear bank of tubes, and then laterally across the lower portion of the middle bank of tubes.

thepassageway, as thus provided., bein pro-4 gressively of decreasing cross sections. area from its entrance end. onward.

(l. In combinetion in s boiler o the verti- K" cal type having a. lower drum and a plural-- it of spaced upper drums and a or bunk o watertubes extending upward from the lower drum to each of the upper drums, a lire-box beneath the boiler, un outlet 'due or stack vat a point where the gases leave the tubes, a baille extending from the lower drum longitudinally nl" the tubes o the, frontbank for a portion of their length and" then transversely of such tubes and 'across the middle bank of tubes, and a second baffle eitendin downwardly from the' upper rear drum or a portion of the length or" such rear bank of tubes, and then laterally across the-'lower portion of the 'middle bank r of tubes, the two baos being 'located so as to divide the sections of gradually decreasing length 'trom top to bottom, and the passageway, as provided by .the baflles, being progressively of decreasing cross sectional area from its trance end onward, in order lso compensate for the shrinkage o the gases due to their decrease in temperature, and to provide for an increasing velocity of the gases as they progress through the various passes of the boiler.

middle `bank of tubes into three 1 In testimony whereoi'i7 have hereunto subscribed my name this lift-lr day of May,

wenn on essere

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