US1855819A

US1855819A - Rotating steam boiler

Info

Publication number: US1855819A
Application number: US523820A
Authority: US
Inventors: Blomquist Johan Viktor; Ehlinger Marcel
Original assignee: Atmos AB
Current assignee: Atmos AB
Priority date: 1927-11-17
Filing date: 1931-03-19
Publication date: 1932-04-26
Anticipated expiration: 1949-04-26
Also published as: GB362250A; AT128508B; FR38779E; DE553183C; FR638779A

Description

Apnl 26, 1932. J. v. BLOMQUIST ET AL ROTATING STEAM BOILER Filed March 19, 1931 W ll Patented Apr. 26, 1932 J'OHAN VIKTOR BLOMQUIST, OF STOCKHOLM, SWEDEN, AND MARCEL' EI-ILINGEB,-OF

MULHOUSE, FRANCE, ASSIGNORS TO SWEDEN, A CORPORATION OF SWEDEN .AKTIEBOLAGET ATMOS, OF STOCKHOLM,

ROTATING STEAM BOILER Application filed March 19, 1931, Serial No. 523,820, and in France July 7, 1930.

The present invention refers to improve ments in connection with rotating steam boilers of the type comprising a central container communicating with a plurality of tubes mounted around the former in a squirrel-cage like formation, and wherein separate tubes are provided for admission of feed water to the steam generating tubes and for delivery of the generated steam therefrom. Thereby the w, central container may also contribute to the steam generation, and may serve as a receiver for the steam generated within the tubes. During the rotation of the boiler, apart of the feed water entering the steam generat- A 1 ing tubes is returned to the central container,

collection of sludge and the deposit of in crustations have especially arisen at the ends of the steam generating tubes remote from ac the admission pipes for the feed water.

The invention has for its main object to eliminate the difliculty referred to in the foregoing by establishing a continuous flow of the feed water in the same direction throughout This is 'per' the entire length of. the tubes.

formed by introduction of the feed water into the tubes at one end ofthe tubes only, the other end of the same being connected with the partly water-filled central container, so that substantially no collection of sludge can occur in the steam genera-ting tubes as the sludge together with the amount of water returned from the tubes to the central container is conveyed to the latter, from which the sludge may be blown oif either continu ously or intermittently at suitable intervals.

The efiiciency of the invention may be further increased by the arrangement of scraper chains within the steam generating tubes such chains effectively preventing the sludge from adhering to the interior walls of the tubes.

Another means adapted for still further improvement of the result is the provision of an injector for increasing the rapidity of water flow through the steam generating tubes, this injector acting under influence from the fresh feed water forcibly fed in and serving to convey an additional amount of water from the central container in circulation though the steam generating tubes together with the fresh feed water.

In the following the invention is to be described by reference to the accompanying drawing showing an embodiment thereof, the single figure in the drawing representing a longitudinalsection of the boiler body. For the sake of convenience it is suitable to describe the invention by reference to its manthe said hollow pivotthe water, by means of the tubes 2, is conveyed to one end of the steam generating. tubes '3, which are positioned around the central container 4' in a squirrel-cage like formation previously known. At their opposite ends the tubes 3 are connected with the central container 4 by means of return pipes 5, such pipes extending within the tubes 3 substantially to the centre of the same so as to form an overflow for preventing the tubes from being entirely emptied during the rotation of the boiler.

At the operation of the boiler, the Water is displaced from the left to the right in the drawing by means of the tubes 3, a part of the same being converted into the form of steam when passing the tubes 3, the remainder flowing further through the-return pipes 5 into the central container 4. The tubes 3 are interiorly provided with scraper chains 3 which at the rotation will continually perform a scraping action against the inner face of the generating tubes so as to prevent any deposit of impurities on the tube walls, the impurities contained in the water being then conveyed by the flow of the same into the central container.

In order to prevent a deposition of the impurities on the inner face of the container 4, such container is also provided with a scraper chain e.

The generated steam is delivered through a fixedly mounted pipe 6 provided with an upwardly bent inner end positioned at a level above the surface of the bulk of water within the container 4.

A draining pipe 7 having a clown-bent inner end is also provided Within the container 4 such pipe extending into the bottom portion of the container, and by means of the same a certain amount of water may be continually or periodically blown oif from the container, then conveying the impurities accelerate the flow of water through the generator, and especially through its' generating tubes. by means for instance of an injector, which consists of a tube 8 mounted coaxially around the steam delivery tube 6 and acts for the sucking in of additional feed water to the generating tubes 3 from the central container 4, such additional feed water forming a circulation feed water flow.

This injector means may for instance consist of a reduced or throttled portion 9 of the tubular feed water inlet pivot 1, in which the outlet end of the pipe 8 is mounted. By the increased rapidity of flow of the fresh feed water when passing the throttled entrance portion 9, the water from the centralcontainer will be sucked in by means of the pipe 8 and added to the amount of fresh feed water introduced to the pipes 3.

From the foregoing it will thus be apparent that the rapidity, or amount of Water per unit of time, of the flow of circulation through the tubes 3 and the central container 4 may be materially increased, and thereby the said tubes are effectively washed clean.

At intervals it may be desired entirely to empty the tubes 3, and for this purpose the .pipes 5 are provided with a little bore 10 flow bacl: into the said container throughthe. said bores 10.

It will easily'be understood that it is advantageous to mount the steam generating tubes in a manner so as to permit the same a free expansion independently of each other when acted upon by the heat. At their one end the tubes 3 are rigidly connected with the return pipes 5 having a substantial diam.-

eter, and for the aforesaid purpose the feed pipes 2 must therefore be shaped in a manner permitting an easy deformation. In the embodiment shown in the drawing, this may be arrived at by constructing the feed pipes 2 in the form of coils permitting the variation in length of the steam generating tubes 3., forinstance as shown'in the drawing.

The steam boiler body according to the invention may be mounted so as to rotate around a horizontal axis, or even the axis of rotation may take an inclining position.

IVhat we claim and desire to secure by Letters Patent is 1. In a rotating steam boiler of the character described, a central container, a plurality of steam generating tubes positioned in a squirrel-cage like formation around the same, means for the force-feed admission of fresh feed water at one end of the said steam generating tubes independently of the central container, means for connecting the opposite ends of the said tubes with the said container, and means for delivery of the generated steam from the latter.

2. In a rotating steam boiler of the character described, a central container, a plurality of steam generating tubes positioned in a squirrel-cage like formation around the 3. In arotating steam boiler of the char acter described, a central container, a plurality of steam generating tubes positioned in a squirrel-cage like formation around the same, means for the force-feed admission of fresh feed water at one end of the said steam generating tubes, means for returning of additional feed water from the central container to the generating tubes at the same end of the latter, means for connecting the opposite ends of the said tubes with the cen-;

tral container, and means for delivery of the generated steam from said container.

4. In a rotating steam boiler according to claim 3, the additional feature of a scraper means mounted in each of the steam generat-' T ing tubes and connected with the opposite ends of the same.

5. In a rotating steam boiler of the character described, a central container, a plural- .ity of steam generating tubes positioned in a,

squirrel-cage like formation around the same, means for the force-feed admission of fresh feed water at one end of the said steam generating tubes independently of the central container, injector means actuated by the fresh feed water forcibly fed in and adapted for returning of additional feed water fro-m the central container to the generating tubes at the same end of the latter, means for connecting the opposite ends of the said tubes with the central container, and means for delivery of the generated steam from said container.

6. In a rotating steam boiler according to claim 5, the additional features of a scraper means in each of the steam generating tubes and in the central container, and means for blowing off the sludge from the bottom portion of the latter.

7. In a rotating steam boiler of the character described, a central container, a plurality of steam generating tubes positioned in a squirrel-cage like formation around the same, an inlet for fresh feed Water to the.

tubes, a flexible pipe connection connecting each of the steam generating tubes at one end of the boiler With said feed water inlet independently of the central container, rigid tubular return pipe connections between'the generating tubes and the central container at the opposite end of the boiler, and means for delivery of the generatedsteam from the said container. v

8. In a rotating steam boiler according to claim 7, the additional features that the rigid return pipe connections are extended into the steam generating tubes so as to form overflow outlets therefrom, and that small sized outlet means are provided in the extended return pipe ends in a position adjacent to the portion of the steam generating tubes nearest to the axis of rotation.

9. In a rotating steam boiler according to claim 7, the additional features of scraper means in each of the steam generating tubes and in the central container, and means for blowing off the sludge from the bottom portion of the latter.

10. In a rotating steam boiler of the character described, a central container, a plurality of steam generating tubes positioned in a squirrel-cage like formation around the same, an inlet adapted for the force-feed admission of fresh feed water to the tubes, aflexible pipe connection connecting each of the steam generating tubes at one end of the boiler with said feed water inlet independently of the central container, rigid tubular return pipe connections between the generating tubes and the central container at the opposite end of the boiler, such return pipes being adapted to form over-fiow means Within the steam generating tubes, injector means actuated by the fresh feed Water forcibly fed and in the central container, and means for blowing off the sludge from the bottom portion of the latter.

In testimony whereof we have signed our names to this specification.

J OHAN VIKTOR BLOMQUIST. MARGEL EHLINGER.

in d dapted for returning an additional