US1411880A - Boiler - Google Patents

Description

C. DUOUENNE.

BolLER.

APPLICATION FILED APR. 11| 1919- 2 SHEETS-SHEET 1.

Hanf-ran BWM l c. DUQUENNE'.

BOILER.

1,41 Y APPLICATION FILED APR. H, 1919. Apr. 4

2 SHEETS-SHEET 2.

PATENT OFFICE.

CAMILLE DUQUENNE, 0F PARIS, FRANCE.

BOILER.

Application filed April 11, 1919.

To all tta/mm, 'it may concern.'

Be it known that 1, CAMILLE DUQUENNE, a citizen of the Republic of France, and :t resident of 6 Rue dUlm, Paris, France, have invented new and useful Improvements in and Relating to Boilers, ot which the tollowing is a specification.

The present invention relates to a boiler of the type comprising vaporizing elements each formed ot a group of straight tubes, vertical or almost vertical, secured at their extremities in collectors of headers, the up-A per header of each element being connected with the drum of the boiler, and the lower header connected with the water-return collector by means ot' nipples, which allow of very rapid mounting and dismounting.

The steam-boiler forming the subject ot the present invention is characterized by the fact that a longitudinal partition divides the superheating tubes and the greater part of the vaporizing tubes from the direct action ofV the fire, this partition stopping at a certain distance from the rear wall supporting the boiler, so that the products of com bustion circulate from front to rear, first heating only the directly flame-licked tubes or tire-box tubes oi the vaporizing groups, and then coming round towards the front between this partition and the corresponding outside lateral wall of the boiler casing and heating the other vaporizing tubes and the superheating tubes.

The annexed drawing shows by way oi' example one form of carrying out the invention as applied to a marine boiler.

Figs. l and 1a show two halt sections transversely in different vertical planes; Fig. 1 through a superheating element and Fig. lafthrough a vaporizing element re-` spectively following line 1-1 and line. 1,-1a ot' Fig. 2;

Fig. 2 shows diagrammatica'lly, on a smaller scale, a section through line 2-9 of Figs. 1. and la'. v

The boiler consists of an upper drum` cz connected at each of its extremities by two water-return tubes or downcomers al, al and o2, a2 to two collectors or boxes b, b. The vaporizing elements are composed of banks or groups of straight tubes c, o very slightly inclined relatively to the vertical, which are expanded at their extremities into headers or collectors of square sections Z and e; the lower header d of each unit is connected with the corresponding water-return chamber or Specification of Letters Patent.

Patented Apr. 4, 1922.

Serial No. 289,421.

box b by a nipple or pipe f having a coned metal-to-inetal joint, an ova-l iange f1 slidable freely onthe pipe, ensuring the tastening by means of two bolts. The upper header c of each vaporizing element is also connected with the drum L of the boiler by a nipple el ot' the same kind with two securing flanges e2, e2 connected by two bolts. Each vaporizing element is thus dismountable by removing four bolts; these elements are made to gauge or standardized in such a way as to be interchangeable.

Opposite each open end of the tubes c, c, are arranged upon the headers CZ and c, screw plugs c1, c1, having metallo-plastic joints upon milled surfaces permitting the cleaning or the replacing of each tube.

The superheating elements, shown on the left half of Fig. l and in Figs. 2 and 3, comprise each a number of tubes g, the extremities of which are connected to the front and rear parts ot' the corresponding upper header or collector e3, which is for this purpose divided into two compartments by a partition et. The collecting header e3 for the tubes of eachsuperheating element is bolted or otherwise connected to the upper collecting header c of the corresponding vaporizer; in this portion of the bank ot' tubes, these vaporizing elements consist merely of the fire-box tubes 71, receiving the direct heat of the iiames and separated'trom the superheater tubes g by a thin longitudinal parti tion of carborundum c' supporting` or resting upon the tubes lt; the same is the case in the vaporizing elements, as shown in Fig. 1. These partitions z', e' stop at a certain distance from the rear tace oil the boiler (see Figs. 2 and so that the combustion gases are passed from the iront to the rear oi' the boiler between these partitions i, e' which at the rear allow the products of combustion to pass through breaks or openings, the gases then coming around towards the front between these partitions and the exterior walls of the masonry or casing and coming into contact with the tubular elements before escal'aing at the front by the smoke flue. According to the location of the superheating elements in the direction of the length of the boiler, the products of combustion will act upon the superheating tubes g after having traversed a path of varying length, and while still at a more or less high temperature; after the boiler has been constructed, the degree of superheat can be regulated once for all according; to the working conditions of the boiler in each individual ease, by varying the location of these superheating tubes g. This operation presents no diflieulty, since a group of vaporizing tubes c as in Fig. l is simply replaced by a group of superheating tubes gf, connected to a group ot' lire-box tubes it as in Fig. l, and vice versa; The lower part of the drum o, as well as the connecting nipples of the upper headers e, are protected from heat-radiations by lagging,f of asbestos or 'by earborunduui ittings j.

The Water and saturated or wet steam rises in the vaporizing tubes, and the wet steam passes into the drum a Where the steamfis separated from Water: the Water n descends by the return tubes or downcomers al, a2 at Jfront and rear into the lower waterchambers or boxes ZJ, @whence it again rises into the vaporizing elements, the fire-box tubes k being first supplied. Y

At the lower part of the Water-return tubes are arranged two pockets Z at the bottom of which are the bottom drawoff coelrs. The Water feed takes place into the front water-return tubes (1,1.

Steam collected into the drum av by a longitudinal pipe a3 perforated `With holes and arranged at the upper part of this drum makes' exit from this pipe by a steam Valve o4 and passes through the superheating elements g,'whence it is afterwards sent into the main steam receiver; for this purpose the upper collectingrr header` e3 of each sur perheatine,r elementis connected at one end to a steam intake manifold g1 and at its other end to a superheated steam delivery `upper header to the drum, downcorne-rs ron- 4necting the lower header of each Vapori'ainpj tube group with the drum, ,groups of superheating tubes extendingr over only a portion of the length of the boiler, an upper header for each group of superheatingr tubes and extending over only a portion ofthe length of the headers for the vaporizing tubes, nieans for connecting eaeh of said upper headers for the superheating tubes to the upper headers of the corresponding group of vaporizing tubes, a longitudinal Vpartition protecting the superheating tubes and the greater part of the vapomzing tubes from the direct action of the fire, said partition stopping at a certain distance from the rear Wall of the boiler chamber, so that the products of combustion circulate from front to rear, first heating` only the directly flame-heated tubes of the 'vaporizing groups,` and then coming around toward the front between this partition and the lateral wall of the boiler Chamber and there heating the other raporizing tubes and the superheating tubes, 1 e Y Y 2. A boiler comprising a drum arranged .in the upper portion thereof, upper and lower collecting headers, groups "of vaporizing tubes extending between and mounted in said headers, means for detaehably connecting,v the upper header of each group to the drum, downcomers detachably connecting the lower header of each vaporizing tube Igroup with the drum, groups of superheat- ,ing tubes extending over only a portion of the length of the boiler, an upper header for each group of superheatinp: tubes and extending over only a portion of the length the headers fory the vaporizingr tubes, means for detaehably connecting each of said upper headers for the superheating tubes to the upper headers of the correspendingr group of vaporizing tubes, a lon- ,ojitudinal partition protectingr the superheating tubes and the greater part of the vaporizino' tubes from the direct action of the lire, said partition stopping at a certain distanee from the. rear Wall of the boiler chamber, so that the products of combustion circular., from 'trout to rear, first heating only the directly tlame-heate l tubes of lthe ,f'aporizingr groups, and then coming around toward the front between this partition and the lateral Wall of the boiler chamber and there heating,r the other vaporizingr tubes and the superheatino,r tubes.

ln testimony whereof l have signed my name to this specification.

CAMILLE DUQUENNE.

7i tnesses @Harmes Dorn', W. Dnrnvnniron'r.

Images