US2530798A - Preheater - Google Patents

Description

Nov. 21, 1950 N. A. ARVINS EI'AL PREHEATER 2 Sheets-Sheet 2 Filed Novv 11, 1944 INVENTORS NHTHQN Fl. H RVINS FIBRQ HAM H. F! RVINTZ BY ATTOR EY Patented Nov. 21, 1950 PREHEATER Nathan A. Arvins and Abraham A. Arvintz, Brooklyn, N. Y., assignors to Blazel Corporation, a corporation of New York Application November 11, 1944, Serial No. 563,028

3 Claims.

This invention relates to preheaters primarily used for preheating fuel oil for supply to oil burners of various kinds and classes. More par ticularly, the invention relates to apparatus of this kind having yieldable means compensating for expansion and contraction of the circulating unit andthe casing or jacket therefor, in order to prevent stresses or strains on the unit. Further, the invention includes the use of a coil, through which the heating medium is circulated and the arrangement of this coil in the jacket or casing of the apparatus to heat a transfer medium contained therein for heating the circulating coils of said unit. Still further, the invention include means for circulating the medium in the casing or jacket to provide more efficient heat conductivity and to eliminate dead pockets in the apparatus.

Some features shown and described herein are claimed in our divisional application No. 726,420, filed February 4, 1947.

The novel features of the invention will be best understood from the following description when taken together with the accompanying drawing, in which certain embodiments of the invention are disclosed and in which the separate parts are designated by suitable reference characters in each of the views and in which:

Fig. 1 is a longitudinal sectional view through an apparatus made according to our invention with the central portion of the apparatus broken away.

Fig. 2 is a section on the line 2-2 of Fig. 1 on a reduced scale.

Fig. 3 is a section on the line 33 of Fig. 1 on a reduced scale; and

Fig. 4 is a sectional view at right angles to Fig. 1 showing one end portion only of the preheater.

In the accompanying drawing, l represent the main casing or jacket of the preheater apparatus. The ends of the casing have outwardly projecting annular flanges H and I2. The end portions of the casing, adjacent the flanges, have ports [3,14, l5 and I6 which, in the construction shown, are closed by plugs l1, l8, l9 and 20. However, in some instances, these passage 26 in the header. The header also has an oil outlet passage 21 which communicates with another passage 28 in the header. Between the passages 25 and 28 is a chamber 29.

At 30 is shown a circulating coil or tube unit. This unit comprises end plates 3| and 32, in which are supported a plurality of circulating tubes, part of which are shown in Fig. 1 of the drawing. The tubes 33 communicate with the ports may be used to circulate a heating or transfer medium through a chamber 2| of the casing 10.

At one end of the casin 10 and detachable with respect to the flange I2 is an oil distributing casing or header 22 having an annular flange 23 secured to the flange l2 by circumferentially spaced bolts 24. An oil inlet pipe 25 is coupled with the header 22 and communicates with-a passage 26 at one end and the other end communicates with a chamber 34 in a header 35, the header having a central partition, as seen at 3B. Thus, oil circulating through the tubes 33 into the chamber 34 will then circulate back through the tubes 31 into the lower portion of the chamber 29. The oil will then pass from the chamber 29 through the tubes 38 into the other chamber 39 of the header 35, the oil being discharged from the chamber 39 through the tubes 40 which open into'the passage 28. From the foregoing, it will appear that a back and forth circulation amounting to what may be termed four passes is provided.

The header 35 includes an annular coupling flange 4| secured to the end plate 3| by bolts 42. These bolts also pass through an intermediate mounting ring 43 having gaskets 44 at both sides thereof. The ring. 43 is coupled with another larger mounting ring 45 through the medium of a yieldable coupling 46 welded or otherwise secured to each of the rings 43, 45 and of U-shaped cross-sectional form. The coupling 46 provides an expansion coupling between'the unit 30 or-the header end 35 of said unit and the corresponding end of the casing l0, bolts 41 being employed to secure the mounting ring 45 to the flange H of the casing i II.

The chamber 2| opens into an annular chamber 48 in the header 22, as seen at 49.

The chamber 48 completely envelopes the annular reduced portion 50 of the header, within which the passages 26, 28 and 29 are arranged, as will clearly appear from a consideration of Fig, 3 of the drawing.

The reduced portion 50 has an end wall 51 which terminates short of the end wall 52 proper of the header 22 and this forms between the walls 5| and 52 a circulating chamber 53 which jackets the outer portion of the passages 26, 28 and 29, except where the tubular connectors 26a and 28a bridge the walls 5! and 52; thus, it may be said that the chambers 26, 28 and 29 are completely jacketed on outer surfaces thereof.

Centrally of the reduced portion 50 of the header 22 and centrally of the chamber 29 is a.

conical tube 54, with which is coupled a circulati pipe 55 which extends centrally through the chamber 2| to a point short of the plate 3|, as seen at 56. The tube 54 provides a further jacket ing of the chamber 29 and this tube opens into the chamber 53.

Centrally of the header 22 and in alinement with the tube $4 :is an opening 5'! closed by a plate 58, in which is mounted a propeller shaft 59 driven by any suitable means for driving the propeller blades 60, disposed in the chamber 53 at the flared end of the conical tube 54. A suitable packing gland BI is mounted on the plate 58 and around the shaft 59. Withthis construction, water or any other fluid heat conducting medium can be circulated through the casing 2| by forcing the fluid through the tube 55 and into the end of the chamber 2| at the discharge end 56 of said tube and this fluid will then circulate back and enter the chamber 53. In this Way, the heatingun'edium or transfer medium may be kept in :constant circulation to provide efiicient heating "of the oil circulated through the tubes of the unit 36, {as qireviously described.

' .The end :plate 232 of the .unit 35 is bolted or ptherwisesecured 'tothe inner end of the reduced portion iiiof the header 22, as seen at 62 and suitable packings =63 are provided between the ip1ateZ-32 andareduced portion 50 and a packing -64-is also provided ibetweenthe flanges l2 and 23. In like-manner, packings 65 are employed between the :flange -H :and 'the mounting ring 45.

The header 22 has upper and lower passages Tfifiand r61 ,-the latter forming an intakefor water or otherzfiuidto be introduced into the chamber 2|; whereas :thepassage 66 may be used as an outlet in the event that a forced circulation is desired through the chamber 2| independent of the circulation previously described. However, when -no circulation is provided, the passage 65 serves as .meansfor placing gauge devices of other controls commonly employed in apparatus of the kind under consideration, particularly in the control of temperatures in the water or other medium :arranged in the chamber 2|, but these devices are not shown, as they form no part of the present invention.

-Mounted :in the lower portion of the header :22 is 'an inlet pipe 68 which passes through a .gland'ts in the header and this pipe forms one endof a spiral coil 19 arranged in the chamber 2| around and outwardly of the tubes of the unit-.39. The coil It extends substantially the full length of the chamber 29 and extending from .the end coil :11 is a discharge tube 12 which is arranged within the coil '10 and the discharge end 13 thereof passes through a gland 14 at the top of the header casing 22.

A suitable heating medium, such as heated water, steam -.or the like, is introduced into the coil it through thepipe 68 to heat the transfer medium or fluid in the chamber 2| which in turn .heats the oil in the circulating tube of the unit an, as this oil is circulated back and forth through the unit in the manner previously described.

In-this 'connection, it will be understood that, in referring toa preheater or heat exchanger, this is-doneto illustrate one adaptation and use of the :invention. The apparatus may be used for rany purpose and, in some instances, cooling agents will be used, rather than the heating agents and the various passages, tubes and chambers may be utilized :for the circulation of different types and kinds-of fluids, the important factor in the dreat exchanger or preheater being that contamination is avoided in the event of a break or leak in any of the circulating tubes of the unit 30 and this is particularly desirable when boiler water is circulated through the heating coil 10. It will be understood that the water or fluid in the chamber 2| and associated chambers will be simply a city water supply or water apart from the boiler water or steam circulated through the coil 10.

It will be understood that, by removing the bolts 24 and detaching the bolts 42 from the plate 4|, the jacket including the header 35 can be removed, thus freely exposing the unit 30 as well as the coil ii! for cleaning and repair. As and when desired, the unit 30 may also then be removed by detaching the bolts 62 and this unit may be removal of the coil 10. Allthiscanbe-done without disturbing connections with .the pipes 25 and L? and the pipes or other connections with .the passages-Stand 6'5. Of course if any connections have been made with the passages |3-.|'B-inclusive, these connections will have .tobe uncoupled before thecasing in can be removed, as above stated. 7

Having fully described .our invention, what .we claim as new and desire -to secure by Letters Patent is: r i

1. In preheaters employing two headers -anda casing joiningand spacing said headers, atube unit between the headers and .imspacedrelation to the casing,a spiral coil encircling the .tubes of said tube unit withinthe chamberof said-casing, means in one header only of the preheater .for circulating'fluid and similar .mediums .through thetubes of the tube unit, the other-headenjoining-the casing through a ringstructure, said coil and the chamber of said casing, and means for detachably coupling the casing .in conjunction with said ring structure from the first header without disturbing the tubeunit and .coil orany of the connections with said first header.

2. In preheater-s employing two headersanda casing joining andsp-acingsaid headers, a tube unit between the headers and in spaced relation to the casing, a spiral coil encircling the tubes of said tubeunitwithin the chamberof saidcasing, means in one header only of the preheater for circulating fluid and similar mediums through the tubesof the tubeunit, the other header joining the casing through a ring structura'said coil and the chamber of said casing, means for-detachably coupling the casing in conjunction with said ring structure from the first header without disturbing the tube unit andcoil or any of the connections withsaid firstheadenand means for detachablycoupling the tube unit with said first named header.

3. A preheater of the class described comprising an outer casing, headers detachable .with :respect to ends of the casing, one header being directly and :detachablycoupled with one end or" the casing, a ring structure detachably coupling the-other header with the other end of the casing, a circulating tubeunit arrangedlin said saw ing in spaced relation to the walls thereof and detachably coupled with the first ,header and with the second header through said ring structure, the first named-header having a plurality of passages in communication with the tubes of said unit,'one of the passages forming 'the inlet for a fluid-tobe heated,.another-.passage forming an outlet for said fluid, the other header having independent chambers placing the other ends of the tubes of said unit in communication, a spiral coil arranged in said casing and around the tubes of said unit, means in the first named header supporting inlets and outlets for said coil to provide circulation of a heating medium through the coil, means on the first named header for introducing a heat transfer medium into said casing around said tubes and coil, and means for detaching said casing, with the ring structure thereon, from the first named header without disturbing any of the fluid connections with the first named header and the tube unit and said coil.

NATHAN A. ARVINS.

ABRAHAM A. ARVINTZ.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS

Images