US1651049A - Boiler for heating systems or similar purposes - Google Patents

Description

Nov. 29, 1927.

M. TREscl-low BO-IBER FOR HEATING SYSTEIS OR SIIILAR `PURPOSES Filed April' 23, 192s Figi `Q TT ORNEYS Patented Nov. 29,1927.

UNITED 1 STATES iss-iras c MICHAEL rnnscnow', or Coram-menu, DENMARK. l

Boitier non nna'rne svsfrnivrs on SIMILAR iennrosns.y

' Ap'piicatlon flied apra es, i926, sensi No. 105,328,milniienmark'iaay 16,1925.

It is well known tl at the amount of ,heatVV given oit' by the .heating surface of a'boiler than in hot-water boilers, as the latter will have a vmuch lower Vmean temperature of Athe water, but in spite of vthis tact the heat transmission per unit (sq. ft.) ot' heating surface of a hot-water boiler will, it' anything, be less than the heat transmission ot the corresponding steam-heating boiler. T his is due to the fact that ordinarily there will always be a lively circulation ot the water in a steam boiler on account o'll the gene ation of steam which takes place near the parts of the heating surface which are subjected to the most intense heat, while in the 'ordinary hot-water boiler,-in which no steam generation takes place-there will be practically no circulation, the velocity ot the water cooled-off inthe heating system being lost as the water enters the boiler, and owingto the comparatively great sectional area of same, the water passes the heating lsurface at a very low speed (generally on the counter-current principle). As a rule there will be no local circulation.

r)he tact that the water in ya hotwater boiler is relatively stagnant has Ylor such boilers not only the drawback that the heat transmission of the heating surface will be less than necessary, but it entails further the drawback that the parts ot' the heating surface which are especially exposed to the lire are liable to become overheated, which again may result in leakage. rlhis is,lfor instance, a common occurrence in hot-water (smoke) tube-boilers, where the tube-plate facing the combustion chamber, particularly in vertical boilers where the tube-plate is arranged horizontally, very often due to overheating will become leaky at the places where the tubes are expanded into the plate, and these frequent leakages will result in a too rapid destruction of both vtubes and plates, even if the tubes are re-expanded.

The use of yvertical (smoke) tube-boilers has been greatly restricted by these drawbacks, although it often would prove con- Vvenient to use such boilers, as they offer advantages in economy in floor space. In horizontal tube-boilers certain devices have been agplied'toA setup .a rapid circulation of the -water near-the--exposed tube-plate of the x boiler. Such; well `known devices, however,v

can not be applied to verticaltube-boilers."

VThe drawing shows an' Vexamplefof how the invention may beA applied to a hot-water boiler of the above mentioned kind and provided witha t'uel magazine.

`Fig. l shows a vertical section oi the boi-ler according to the invention, and

F ig. 2 a section following the line A-B in Fig. l'.

As an example t-he boiler is shown having a tire space with sloping grates for thel combustion ot' bituminous fuel, but a horizontal grate may also be used.

By a partition b with double partitionwalls the fire box a is divided into two portions, tlie lire box proper with the combustion chamber 0, and the smoke box (l. AS will be seen from Fig. 2 the partition b is closed at both ends, forming a flattube theV lowei' end et which, inthe present design, is shown entering the lower part ot' the boiler, i. e., in the Water space between the bottom plate of the tire box a and the bottom plate e of the boiler` proper, and the upper end of which is entering the upper part of the boiler right above the lower tubeplate The partition Z9 may be arranged either vertically or inclined. Through the smoke tubes g thegases pass from the combustion chamber c to a header i, down through the boiler tub-es z', to the smoke box Z andheiice to the chimney.

The water in the partition L, above the upper entrance of which a` guide plate 7;, Fig. l, may be provided, will become intensively heated, exposed as it is to the heat from two sides, from the combustion chamber c and the smoke box d, thereby causing a large volume of water, eventually intermixed with steam bubbles to flow from the bottom of the boiler upwards through the partition b to the space abovethe nre box, where it is distributed across the'tube-plate, thus preventing overheating of the saine. The downward circulation of the boilerwater will mainly take place at the back front, of the boiler, between the backplate ot' the latter and thevback plate of the fire box (smoke box), asindicated by the arrow :c in Fig. 1. p

The cooled-0H return Water from the heating system may, for instance,.enter the boiler in the rear end, and the water heated ink the lll) boiler should preferably leave thel boiler; from the'upp-er plate, through one or more flow pipes l.

Having thus described my invention, what I claim isz l. Vertical boiler orheatingsysteins hav ing upright smoke tubes asy heating Surface and the fue bex. divided inte acombustioii, chainber and a vsmoke box by means of a partition"consisting- "or-t'worspacedL walls, said partition forining a direct communication between the upperandflowei'lpartsiofth'e boiler.

naine to this specification.v 2. Boiler for heating systeins having ,Ver-y tween the combustion chamber and smoke box of the boiler., said, partition forming a communication between the upper and lower parts of tlie boiler, aguide plate provided above the entrance of `the partition into the upper parteii the boiler, saidl plate being positioned to distribute the water rising in the partition across the inost intensively heated portion of the tube plate.

In testimony whereof I have signed iny MICHAEL rREsoi-iow.

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