US2429580A - Lined conduit - Google Patents

Description

Oct. 21, 1947. F. H. JANECEK ETAL LINED CONDUIT Filed Nov. 11, 1943 2 Sheets-Sheet 1 lZa INVENTORS FEA Mr M JANEGEK LEONARD zAzsq/v A rzwe/vsrs Oct. 21, 1947. I F. H. JANECEK ETAL LINED CONDUIT Filed Nov. 11, 1943 2 Sheets-Sheet 2 INVENTORS FRANK H- JA/VE'CE'K & ZEONAED ZAESON m w m T A Patented Oct. 21, 1 9 47 LINED CONDUIT Frank H. J anecek, Windham, and Leonard Larson, Shaker Heights, Ohio, assignors to Republic SteelCorporation, Cleveland, Ohio, a corporation of New Jersey Application November 11, 1943, Serial No. 509,862

2 Claims. (Cl. 13869) This invention relates generally to the art of protecting walls against abrasive wear and particularly to new and improved means for protecting conduits of blast. furnaces against wear by the passage therethru of gases carrying fine abrasive solids.

Blast furnaces are equipped with conduits such as uptakes, bleeders, cross-heads and downcomers thru which highly heated gases carrying small pieces of abrasive solids such as ore, coke and limestone, pass at high velocities. These solids contact with and rapidly wear away the conduits at various places, particularly at elbows and bends, and at other places where gas currents sweep heavily against part of the surface of the conduit. Since the wear caused by the solids is not uniform in all parts of a conduit, certain parts of the conduit walls are worn away more rapidly than other parts and hence part of the conduit becomes useless while other parts could be used for much longer periods of time.

Efforts have been made heretofore to protect the parts of such conduits which are subjected to the greatest wear but, so far as we are informed, none of those efforts has been entirely satisfactory. One proposal to solve this problem was that of making large wear-resistant liner plates, for example, sections as large as four feet by six feet, arranging the plates in edge to edge contact, and securing the margins of the plates to the conduit by bolts, rivets or weld metal. This proposal was unsatisfactory for several reasons. The conduit was subjected to varying temperatures on the outside, while the liner plates were maintained at a high temperature while the blast furnace was operating. The plates buckled and warped due to changing temperatures and often damaged the conduits by bending springing or actually cracking or breaking the conduit, and-sometimes they tore loose from the conduit and slid down along the conduit, often lodging at bends or elbows, thus partly clogging or interfering with the operation of the at or near its middle.

In the drawings accompanying and forming a part of the specification,

Figure 1 is an elevational view of part of a blast furnace and dust catcher with associated conduits including uptakes, bleeders, cross-heads and downcomers;

Figure 2 is a top plan view of the apparatus of Fig. 1; I

Figure 3 is a plan view showing a pluralityof liner plates of this invention assembled in a con-;

duit;

Figure 4 is an axial sectional view taken. on line 4-4 of Fig. 1 thru the expansion joint thereof; and

Figure 5 is an enlarged sectional view taken" on line 55 of Fig. 4.

The blast furnace I of Figs. 1 and 2 is provided with four uptake conduits 2 more orlessequally spaced around the top of the furnace.

It will be understood from Figs. land 2 that gases passing from furnace I to dust catcher 6 will pass bends l in uptakes 2, will encounter a restriction 8 in bleeder 3, will make sharp turns in direction at} when-entering crossovers 4, will make other sharp turns and pass thru restrictions ID in passing into downcomers 5, and will make turns or bends II in the latter before entering the-dust catcher 6. It will also be understood that in those restrictions and at those turns'and bends, much of the fine abrasive material carried by the gases will come forcibly into contact with the surfaces of the conduit and-thatthe resultant abrasive wear caused by the solid particles in the gases will be greater at those points than elsewhere.

The uptakes 2, bleeders 3, cross-overs 4, and downcomers 5 are lined as is indicated in Fi 1. Preferably the uptakes 2, bleeders 3 and crossovers 4 are lined thruout, while the upper ends of the downcomers and part of the remainder thereof are lined as indicated. If desired, the entire inner surface of each of these conduits may be lined.

In Fig. 3 a plurality of liner plates l2 are shown connected in assembled relation on the inner surface of a conduit. Each of these plates has its edges 12a spaced 9. short distance from the ed es of adjacent plates. At approximately its center each plate in place by suitable attaching mean :pheric temperatures. .platesr'are such that the intervening space between, plates ;.can accommodate normal expansion :of'theplateathe tendency of theplates topress eachplate is attached to the conduit in any suitable manner, for example, as by weld metal .13.

LIt will be understood that the plates need not be square or rectangular, as shown, for they may be about x10"- x /2", but, on the contrary, may

@belarger. or smaller in length, width and thickness. Preferably, each plate should not be so largethat when it expands under operating temperatures it will take up more than about onehalf of the space between it and adjacent plates whichwas shown, is about at normal atmos- If the dimensions ofthe againstoneanotherand buckle, warp ,or.apply shearing forces on the securing means willbe avoided. The weight of each plate should not be in excess of the strength of the securing means.

Furthermore, securing means other than weld metal-may be employed but, regardless of the .natureofthe securing means, the location of the Jattershouldbe in the central part of each plate so. that expan'sionof the plate in all directions may. take. place freely and without imposing any shearing. forces on the securing means.

-In'Figs. 4 and 5 an expansion joint for a lined conduit: embodying the present invention is illus- ,trated. In these figures the opposed ends I5 of adowncomer conduit 5 are connected by a seal .-l6-to prevent the escape of gases. Each conduit .end' [5 is lined withplates l'2 similar to those .shown in'Fig. 3,.and theseplates are attached to the conduits by weld-metal; I3 near their. centers. "Within-the conduit ends a metal ring I1 is iattached as by weld metal [8 at one end there- ;of,.to one of the conduit. ends 15, extends past the seallB andhas a sliding fit with the other conduit end. Thisyring is preferably equal in thickness tothewear, plates. 12, so that its inner surface is v.flushwith plates 'l2 of the conduit .-ends"-.l5. This ring I! is provided with a row of :wear; plates 19 atitsends and with plates I2 be- 45 wtween those rows. 'a-plates 12 except that they are somewhat longer, aretattached'to ring H. as by weld metal 20,. and soverlapthe. plates i2which are attached to the .conduit end -l5 at eachend of ring 11. Itwill be understood from the foregoing description that Theseplates 19 are similar to whenthe righthand conduit end 15 moves axially relative to the lefthand conduit end to which the ring llis attached, the wear plates on the right- .hand conduit end will slide on the outside of plates I 9 attached to ring l1. In this manner the expansion joint is permitted to function while Having thus described the invention so that 4 othersskilled in the art may be able to understand and practice the same, we state that what .we desire to secure by Letters Patent is defined in arranged edge to edge on the inner surfaces of the conduit sections and ring with expansion spaces between the edges of adjacent plates, the platesat the ends of said ring overlapping the :plates on the conduit ends, and a single connectionbetween the center part of each plate and the metal conduit.

2. A'conduit for blast furnace gases carrying abrasive solids comprising a rigid, imperiorate metal shell and a sectional liner. for said shell, said liner consisting of a plurality of thin metal plates arranged with side surfaces against the inner surface of said shell and with expansion spaces-between edges of adjacent plates, and weld metal extending thru and filling holes provided.

therefor in said plates at their central points,

said weld metal constituting the sole means for supporting and connecting the plates to the shell.

FRANK H. JANECEK. LEONARD LARSON. REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 529,990 Wyckoif et a1 Nov. 2'7, 1894 735,644 Wirtz Aug. 4, 1903 789,948 Williams May 16, 1905 814,949 Edgar Mar. 13, 1906 936,308 Cook Oct. 12,1909 1,675,316 Russell June 26, 1928 1,710,577 Hahn Apr. 23, 1929' 1,827,727 Blizard Oct. 20, 1931 1,843,790 Snow et al Feb. 2, 1932 1,900,006 Bailey Mar. 7, 1933 1,982,307 'Kahn Nov. 27, 1934 1,987,372 Schellhammer Jan. 8, 1935 1,995,216 Morrow Mar. 19, 1935 2,079,982 Belohlavek May 11, 1937 FOREIGN PATENTS Number Country Date 488,913 Great Britain July 15, 1938 734,968 France Aug. 13, 1932 191,911 Switzerland July 15, 1937

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