US1541304A - Baffle wall for boilers - Google Patents

Description

June 9, 1925. 1,541,304

E. A. WINHOLT BAFFLE WALL FOR BOILERS lriwznlc: r;

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Patented June 9, 1925.

UNITED? STATES? PATENT ome EI-NAR A. WIN'HOLT, or Momma, ILLINOIS; ASSIGNOR "To DEERE & company, or MOLINE,- rumors, A CORJPOR-ATION or rumors.

BAF FIi-E WALL FOR BGILERS.

Application filed December 27 1921. Serial N-o.*525,120.

To all whom it may concern:

Be it known that I, EINAR A. \VINHOLT,

a citizen of the United States, residing at Moline, in-the county of Rock Island and State of Illinois, have invented. certain new anduseful- Improvementsin BafHeWValljs for Boilers, of which the followingis a specification, reterencebeing' had therein to the accompanying drawing. p

This invention relates to baffles for boilers, particularly boilers of the water tube type, and pertains to the: means installed between the tubes to form the bailie or batprovided with a considerable number of tubes arrangedfor water to circulate therethrough, the tubes being situated for the passage therearound of the hot gases generated in the combustion chamber of the boiler, \Vhile these tubes are positioned in staggered relation to each other, with respect to verticalplanes, to present a maximum. circumferential tube surface to the hot gases flowing through the boiler, it has been found. that more ofthe heat can be extracted from. the gases and the efliciency of the boiler materially increased by providing a suitable bathe or baflles, to cause the hotgases, as

tubes more than. once and. contact with agreater proportion ot'the-length otthe' tube surfaces. j p V Baihes of. fire brick have been built, between andflaround the tubes at the time the tubes were built into the boiler, but such bellies wererelatively thick and covered a greater length of: the tube surface than. was

desirable to obtain. the greatest efiiciency and 40 economy from theboiler, V

acrosst-he tube portion of boilers-by. using a heat resisting material that can be handled As is well/known, water tube boilers are they. flow through the boiler, toycross the Molded or poured, battles are also built countered in providing a. form or mold that willretain the plastic material.

The usualpractice is to build. lattice like walls to retain theplastic material by inserting wooden. strips between" the tubes and interlacing them, but such forms are insecure, bulge under the weight and pressure of the plastic material, molding. ab'afil-e that is o f uneven. thickness, using. an excess of the heat. resisting material, and where bulges occur the battle is unduly thick and. more of the length of some of the tubes are covered than is desirable. .Such a form also leavesa rough, imprint on the faces otthe' bathe, which acts to retard the proper flow otthe gases and, furthermore, as such forms cannot be built tight and to closely fit around the tubes, the plastic material leaks through.

openings in the forms and. causes gaps in the battle through which. the. hot gasesafterwafifld leak and lessen the efficiency of the ba e..

My invention comprises peculiarly shaped.

blocksthat can readily-be installed between the tubesat the time the tubes" are built into the boiler, the shape of. the blocks being such. that they not only fit-closelyaround-the tubes to form a substantially imperforate wallin av plane that intersects the longitudinal; axes of the tubes, but are sustained position by their contact with each other and their engagement with-the tubes.

The blocksmay be made of heat resisting material-and installed. to forinthe perinanent bafiie,.or if a poured. battle is preferredthe blocks may be made of a combustible material and installed to serve as forms to:

hold a. plastic heat resisting material until the latter becomes dry, the forms burning away. when: the boiler is fired My invention has for its object the provision of means to be employed in connection with. the construction of a battle for water tube boilers, andIw ithwhich meansa bafile' may be formed that will fit the tubes closely; that will be of uniform thickness5 that will have smooth facesand that can be economically installed.

Referring to the accompanying drawings in which like numbers indicate similarparts: I I I Figure 1 is a-ver-tical longitudinal section of a convention-al water tube boiler, provided with baflles;

Figure 2 is'an enlarged detail of a transverse section of a portion of one of the baflies illustrating one application of my invention;

Figure 3 is an elevation of Figure 2; and

Figures 4 and 5 are perspective views of blocks exemplifying my invention.

Referring to Fig. 1, indicates the side walls, 11 the front wall, 12 the rear wall, and 1314 transverse partition walls, all of masonry and comprising the usual setting forboilers of the water tube type. Theside walls are provided with suitable clean-out openings 15, and the front wall with the usual fuel opening 16 leading into the combustion chamber 17, formed between the side walls, the end wall 11, and the partition wall 13, and above the fire grate 18.

The usual water and steam' drum 19 is suspended by hangers 202O from steel beams 2121 which are supported by suitable uprights (not shown) that are built into the masonry setting described. Depending from the drum 19 are pipes 2222 which support the tube headers 23-23, into which are secured the ends of the water tubes 24:, of which there are a considerable number, the latter being positioned over the combustion chamber 17 and inclined longitudinally relative to the horizontal, the arrangement being such that a circuit is estab lished for the circulation of water through the tubes, headers, connections and drum, in a manner that is well understood.

Water is supplied to the boiler through a suitable fixture .25 and steam is taken off through a fixture 26. The blow off fixture is indicated at 25 and the safety valve at 26.

As best seen in Figure 3, the tubes 24 are arranged in staggered tiers, the object in so arranging them being to present as much tube surface as possible to the passage of the hot gases rising from the combustion chamber, but as previously mentioned the tubes will absorb more of the temperature from the gases resulting from combustion, and the efficiency of the boiler be accordingly increased, if bafiies are provided to cause the gases to travel a serpentine path and cross the tubes more than once while flowing through the boiler.

Figure 1 presents an example of how baffles may be employed to cause a triple pass of the gases across the tubes, the baffles being indicated by the numerals 2727. It will of course be understood that the point in the boiler at which a baffle is located, its dimensions, and the position it occupies, will be governed by the ideas of the engineer designing the boiler who will take into account the size of the boiler, its particular design, etc., in determining these matters.

With certain governing factors known, namely, the diameter of the tubes, the distance between tube centers, and the pitch or angle at which abaifle is to stand relative to planes perpendicular to the walls of the tubes, my invention may be put into practice. V r

To practice my invention blocks 28 are employed. In height these blocks equal the distance between a plane passing through the centers of the tubes of one tier and a plane passing through the centers of the tubes of the next adjacent tier, and in width they equal the distance from the center of one tube of a tier to the center of the next tube of the same tier, both dimensions being determined by measurements taken in a plane to be occupied by the face of the baffle. The blocks 28 have recesses 29 formed in their sides to a depth equal to the radius of the tubes 2 1, and the walls 30 of these recesses are shaped to have surfaces that conform to the surface of the cylindrical tubes along the line of contact therewith of said blocks in order that the walls 30 of the recesses in the blocks will fit snugly against the exterior surface of the cylindrical tubes throughout the whole thickness of the blocks. It will be understood that as the baffle is usually built so that it occupies an inclined position with relation to the longitudinal axes of the tubes, as clearly shown in Fig. 1, it is necessary that the surfaces of the walls 30 be inclined so that they will lie parallel with the tubes and fit closely against them throughout the full thickness of the body member. By this construction the blocks have broad contact witn the tubes, thereby giving a stable support and besides the wall as a whole is made more nearly impervious to the passage of the gases, and, when the blocks are used in constructing a form or mold for making a pouredbaffle wall leakage of the plastic material from between the form is prevented. The top and bottom edges of the blocks 28 are provided with interlocking surfaces, such for example as the tongue 31 and groove 32 best seen in Figure 4; and if desired the abutment portions of the side edges of the blocks may also be provided with similar interlocking surfaces as indicated in Figure 5.

As the tubes 24 are built into place in the boiler, the blocks 28 are installed therebetween and as best seen in Figure 3 it will be noted the side edges of the blocks of one course are aligned witlrthe centers of the blocks of adjoining courses, thus breaking the vertical joints between the blocks installed between the series of tiers of tubes. Vhen the blocks 28 are installed in the manner mentioned, they form a continuous interlocking self-sustaining wall in a plane that intersects the longitudinal axes of the tubes and that fits the tubes closely and maintains its desired position.

The baffle formed by the blocks 28 is usually positioned in the boiler to engage with a partition wall, as indicated in Figure 1, and the ends of the baflie usually fit against the side walls of the boiler setting, but the precise location of the battle in the boiler and its relation to the boiler setting, are details governed by the design of the particular boiler in which a baffie is to be installed.

If the permanent bafile wall is to be composed of the blocks 28 themselves, I make the blocks of a heat resisting material, such as fire clay, and in such cases I preferably make the blocks relatively thick as shown in Figure 5; but if a poured bafiie wall is desired I make the blocks relatively thin, as indicated in Figures 2 and 4, and of a combustible material, for instance wood, and install two sets of blocks between the tubes, building walls that are spaced apart a dis tance corresponding to the thickness desired for the battle, (see Figure 2,) these walls serving as a form or mold to hold the plastic heat resisting material that is employed to make the permanent bafiie, the form burning away when the boiler is fired.

It will be understood that when a form or mold is installed for an inverted bafiie like that shown in connection with the partition wall 14;, the space between the walls at the bottom of the form is boarded over or closed in any suitable manner to retain the plastic material within the walls of the form. The term baffle wall as used herein is intended to comprehend a wall constructed of the blocks described either as a permanent baflie wall, or one used in making a form for the construction of a permanent bafile wall by pouring, as hereinbefore described.

What I claim is:

1. In a water tube boiler, the combination with the boiler tubes, of blocks adapted to be inserted between the tubes, the sides of said blocks recessed to receive one-half the circumference of the tubes, said recesses shaped to closely fit the tubes throughout the thickness of the blocks, the top and bot-- tom edges of contiguous blocks provided with engaging means adapted to hold the blocks in position.

2. A bafiie block adapted to be inserted between the tubes of a boiler, comprising in combination, the body member, recesses in the sides of the body member, said recesses shaped to receive one-half the circumference of adjacent boiler tubes, the top and bottom edges of the body member provided with holding means. I

A baiile block adapted to be inserted between the tubes of a boiler, comprising in combination, the body member, the sides of the body member recessed to receive one-half the circumference of adjacent boiler tubes, said recesses shaped to fit the tubes the full thickness of the body member, the top and bottom edges of the body member provided with holding means adapted to engage with the top and bottom edges of contiguous blocks.

EINAR A. VVINHOLT.

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