US2570073A

US2570073A - Furnace wall

Info

Publication number: US2570073A
Application number: US626467A
Authority: US
Inventors: George P Reintjes
Original assignee: Individual
Current assignee: Individual
Priority date: 1945-11-03
Filing date: 1945-11-03
Publication date: 1951-10-02
Anticipated expiration: 1968-10-02

Description

Oct. 2, 1951 REINTJES 2,570,073

FURNACE WALL Filed Nov. 5, 1945 2 Sheets-Sheet l INVENTOR. G'eazyeffie inijes mar 7 G. P. REINTJES Oct. 2, 1951 FURNACE WALL 2 Sheets-Sheet 2 Filed Nov. 5, 1945 3nnentor def/ya? Zz 0259a 51 Patented Oct. 2, 1951 UNITED STATES PATENT OFFICE FURNACE WALL George P. Reintjes, Kansas City, Mo. Application November 3, 1945, Serial No. 626,467

1 Claim. 1

This invention relates to water walls for boilers and has for one of its objects to produce a water wall so designed as to increase the turbulence within the furnace to insure a more complete and intimate mixture of oxygen with combustible gases and thereby increase "the overall efficiency and capacity of the furnace, where the tubes are staggered and form a plurality of enclosures to support a refractory lining, the tubes themselves being interlocked to preserve alignment of the wall under the expansion and contraction of the tubes. Such a wall also increases the turbulence within the furnace.

With a construction embodying the invention it is possible to have the same tube absorbing capacity as if the wall was composed of a solid row of adjacent tubes or a tangential wall without decreasing the emciency of'the furnace at low ratings, since the reflecting power of the refractories will maintain suflicient temperature for combustion of the gases, whereas a black tubular wall does not maintain combustion to the desired degree at low ratings of a furnace.

With the general objects named in view and others as will hereinafter appear, the invention consists in certain novel and useful features of construction and organization of parts as hereinafter described and claimed; and in order that it may be fully understood, reference is to be had to the accompanying drawings, in which:

Figure l is a fragmentary vertical section taken through a series of tubes to illustrate the sawtooth or zig-zag pattern formed by the staggered rows of tubes, said tubes being illustrated as brought to a single plane at their upper ends to enter a boiler drum or header.

Figure 2 is a view of a tube arrangement as it may appear when used with a stoker grate.

Figure 3 is a horizontal section taken through one form of the staggered tube arrangement, the section being taken in the plane of the upper face of a locking plate.

Figures 4, 5 and 6 indicate horizontal sections through modifications of the basic saw-tooth or zig-zag arrangement to illustrate the use of the tubes to secure the refractory wall and insulating casing of the furnace.

Figure 7 is an enlarged perspective view of one form of T-iron which is interlocked with the refractory wall, the stem of the T acting as a securing means for the insulating casing.

Figure 8 is a view illustrating the use of T-irons welded to the tubes and having sliding engagement with metal plates to hold the wall as a whole in alignment on expansion and construction of the tubes.

axes of the tubes.

Figure 9 is a fragmental perspective of the construction illustrating the T-lock between the metal plates and tubes, and the T-connections holding the outer or air sealing wall in position.

In said drawings, where like reference characters identify corresponding parts in all of the figures, numerals l and 2 respectively identify upper and lower boiler drums or headers arranged in any desired relation and connected by a plurality of water tubes 3 in staggered spaced relation.

In one type of construction, see Figure 4, two rows of tubes are employed, namely, an outer row and an inner row, and adjacent tubes of each row being staggered or offset in relation to the tubes of the other row. Threaded down between the tubes are courses of refractories 4, hearing such relation to the tubes 3 that said refractories cannot become disengaged by movement in any direction at right angles to the With this arrangement, a saw-tooth, zig-zag or corrugated pattern is formed on the inside of the furnace, the inner row of tubes being subjected to both direct and reflected radiant heat for more than one-half of their perimeters, while the tubes in the outer row will be subjected to heat conducted through the refractories, as well as to a lesser degree, to radiant heat. It will thus be apparent that the outer row of tubes will be cooler than the inner row. The outer tubes, therefore, may act as downcomers, it being understood that the rows of tubes are connected at their opposite ends to suitable boiler drums or headers forming part of the boiler installation as shown in Figure 2. When desired, according to the design of the boiler, the staggered tubes 3 may be bent back to form a single row for convenience of connection to a boiler drum or header, see Figure 1.

In order to insulate the furnace and utilize the water tube wall as supporting means for an insulating casing and thus obviate the employment of a solid masonry or metal framework for a suspended wall, the refractories 4 may be formed with T-slots 5 opening through their outer faces, for the reception of spaced T-irons 6 or any other suitable securing devices. When the T-irons 6 are employed, their outer ends may be provided with transverse openings 1. The stems of the T-irons 6 are of sufficient length to project through any suitable insulation 8, which may be held in place against the outer row of tubes 3 and the outer faces of the refractories 4, by a sealing or casing wall comprising a combination wire mesh and plastic wall 9. The wall 9 may be secured in position by looping wires I around a securing rod ll threaded through the openings 1 in the stems of the T-irons 6, see Figures 4 and -9.

In Figure'5 a slightly modified construction is illustrated in which there are three parallel rows of tubes, certain of said tubes 12 being designed as downcomers and being entirely embedded in the refractories except at the outer side thereof. In order to insulate the downcomers li2from the". heat of the furnace, the refractories are cut away as at IS, the cut-out portion being packed with the insulation 8, the construction otherwise being similar to that shown in Figure 4. Figure 6 illustrates a further modification in the arrangement of tubes forming the saw-tooth or corrugated pattern; together? with therefractories cooperating, therewith. .7

It has been found thatthe water'tubes'will sometimes tend to bulge out of parallelism; When this condition is encountered, T-irons I4 are welded orotherwise secured in. spacedrBlation to. the .faces of the water tubes 3, and these T-ironsengage T-shapedslots l5 in metal plates I61which are positioned'between courses of the refractories 4,.see Figures 3,8 and 9. By this means anytendency of the tubes to move out of alignment-will be counteractedlor restricted by'a reverse movement of. a companion tube, or of cooler tubes nearer the outer face of the wall. These1p1ates1l6will alsobe cut away as at ll, see"Figure"8, when necessary toaccommodate the insulating plastic 8.

, Fromithe above description it will beapparent thatIL have produced a construction embodying, all of the features of advantage set forth asrdesirable; and while I have described and illustrated the preferred embodiment I reserve the right to all changes within the spirit and scope of the appended claim.

I claim:

A boiler furnace wall comprising a plurality of rows of boiler tubes arranged in parallel spaced rows, the tubes of each row being staggered in relation to the tubes of adjacent rows to form a plurality of enclosures, a column of refractory blocks received within each enclosure and held against movement by'the e'nclosing tubes, metallic plates interposedbetween predetermined refractories and having vertical slots, and extensions welded to said tubes in sliding engage- Y mentw vith said slots. 15

GEORGE P. REINTJES.

REFERENCES CITED UNrrnosTA'i-ns PATENTS Number 7 Name a Date 614,206. Hutchison Nov;v 15,1 L898. 1,703,814 Coutant Feb}.26',-l929 1,732,514 Hunter Oct. 22,1929 1,787,019 Pranther Dec. 30,1930 1,815,759 Watts July.2.1,.1931. 1 ,851,842 Huster 1 Mar. 29,1932 1,922,599 Murray .Aug..15,v 1933. 1,971,312 Hendrickson Aug. 21,- 1934 2,228,819- Emmet Jan-14,1941 2,239,662. Bailey A'pli. 22,1941: 2,263,004 Kuhner NOV. 18,1941

- FOREIGN PA'I'EN IS 7 Number. Country Date 7 12611422 'Great'Britain 1Feb 10, 1927 Germany Apr, 9,.1929