US1446077A

US1446077A - Open-hearth furnace

Info

Publication number: US1446077A
Application number: US479342A
Authority: US
Inventors: Ezra A Wheaton
Original assignee: Bethlehem Steel Corp
Current assignee: Bethlehem Steel Corp
Priority date: 1921-06-21
Filing date: 1921-06-21
Publication date: 1923-02-20
Anticipated expiration: 1940-02-20

Description

Filed June 2l .5.112. m n I 1 Feb. 20, 1.9235

Patentedy Feb. 20, i923.

stars rar nana A. WHEATON, or sraisnows roiNr, MARYLAND, .assrsNoR To n'srirnnrrnivr" STEEL COMPANY, SYLVANIA.

ornNsiEiin'iir ruaNACE. f

To @ZZ fwkom'z't may concern:

Be it known that l, EZRA A.' VVHEATON, a citizen of the United States, and residing at Sparrows Point, countyof Baltimore, State of Maryland, have invented certain new and useful Improvements in Openllearth lurnaees, of which the following is a specification. l

The present invention relates to open hearth furnaces and more particularly to an improved means for supporting -the roof thereof against outward movement at its lateral edges. Heretofore the lateral thrust at' the edges of the `roof has been taken up by channel beams mounted wholly within thcside walls of the furnace. With this construction it is found that vthe channelsv without the structure of the vertical walls,v

of the furnace.

Other objects and features of novelty will beapparent from the description taken in connection with the drawings, in which:

Figure l represents a vertical section of' an open hearth furnace embodying my invention;

Figure 2 is a partial section 2 2 of the open hearth furnace shown in Eig. l; Y

Figure 3 is a vertical section of an open hearth furnace of thev type now generally used.

Referring to the drawing it will be noted that my improved furnace is comprisedk es` sentially of a front wall 1, a rear wall 2, two

` end'walls, not shown, a hearth 3, and an arched roof 4, the walls and roof being made of any suitable refractory material. The vertical component of the weight of the roof is transmitted to the walls by the skew-back 5, and the horizontal thrust'of thev arch isv transmitted by the skew-back bricks to the steel channels '6, and thence to theusteelstays 7, which are suitably tied to the foundation or isn'rirrniinir, PENNSYLVANIA, ii ooaeonarioN or'A rnNN-v` structure at their lower ends, and crosscoii-l I' it will be 'observe'dptliat in my improved open hearth furnace, as illustrated in Figures l and 2, that the channels 6 are more@ ab their 11p-per @nde by the tit-Oris fitted into recesses inthe stays 7, and that;y

the lower fiange's of the channels 6 yare wholly without thewall structure, whereas, l f

in the open hearth furnaceof the type now generally used (see Figure 3), the channels 6 are not fitted into the stays 7, but are flush f with the outer surfaces of the front and rear walls, the lower flanges of the channels being incorporated ,in the wall structure. i In practiceit is found that the refractory lining of the upper portion kof an open 4 yhearth furnace burns away first at the'junction of the roof and wall in the manner indicated by theline `9 in Figure l.l If this" burning is noted iiij time, it is customary to i permit the furnace. to cool off and tol replace only the burnt brick. '-However, if the skew- Vback bricks `are burned, a replacement of a portion ofthe roof is `very difficult and not .always possible, andv under such circumstances it is very often necessary therefore to replace the entire roof. yIn'the type of furnace illustrated in Figure 3, the burning of the refractory lining the junction-ofthe roof and wall also results inserious over-` heating of the channel, pafiticularlyy along its lower flange. This overheating causes the channel to warp and bulge out laterallybetween adjacent stays, thus' permitting `the skew-back bricks to slip and theI rooftocol! is noted. l

It will be observed from'Fig'ures l and 2 that in my improved design the lower flange of the'channel 6 is entirely removed fromy the brick-work structure and is exposed along its lower Aface to the atmosphere, thus facilitating `heat radiation and preventingo the tendency `to warp. Moreover. the with-' drawal ofthe lower' flange of the-channel lapse even before a serious extent of burning from the brickwork structure alsofresults'in the partial withdrawal ofv the skew-back bricks. The line l0, Figure 3, is of the same contour, and indicates the sam-e extent of.

burning` as the-.line 9, Figure l, and it will be observed that for the same extent of burn#I ing the skew-back brick in Figure 3 is considerably corroded, while the skew-back brick in Figure l is not corroded. The irnproved structure therefore tends to prevent burning` cl the skew-back bricks and thus facilitates replacement of a portion of the roer" only when burning is noted.

Having described my invention what l claim as new and desire to secure. by Letters lQatent is:

l. In an open hearth furnace the combination ot stays`r a. Vertical wall, an arched roof,

a skew-back brick between said wall and saidroo'f, said skew-back being laterally supported by a channel fitted into recesses in said stays.

2. In an open hearth ifurnace the combination ot sta-ys, a vertical wall, an arched root', a skew-back brick between said Wall and. said root, said skew-back being laterally supported by a channel itted into recesses in said stays, the lower flange ot said channel being disposed wholly without the structure of said Vertical wall,

3. ln an open hearth furnace the combination ot stays a vertical wall, an arched roof, a skew-back brick between said wall and said roof, said skew-back being disposed in and laterally supported by a channel7 the major portion of the lower fla-nge ot' said channel being disposed wholly without the structure of said Vertical wall.

ln testimony whereof hereunto atiix my signature.

EZRA A. VHEATON.