US2193000A - Coke oven - Google Patents

Description

Patented Mar'. A12, 1940 My present invention relates to a process for avoiding the formation of crevices in the basement brickwork of a coke voven battery having the coking chambers built of materials more expansive than the materials of the basement.

Silica bricks are used in coke oven batteries for the construction of the coking chambers, which bricks aii'ord an excellent resistance against the high temperatures to which the pillars of said chambers are subjected. In the battery basement which is not subjected to such high temperatures material cheaper than silica may be used, such as, for example, chamotte. Furthermore, as in the battery basement comprising the regenerator rooms, the working temperatures vary at some places around 500 C., the use of silica should be avoided on account of its quartz contents which at said temperature expand Suddenly to the amount of 1/2%. As chamotte expands substantially less than silica, there is a certain danger, that the silica pillar resting on a chamotte brick wall by its expansion causes the formation of crevices in said wall.

It is the object of the present invention to avoid the formation of such crevices. I accomplish this object by providing a horizontal sliding joint preferably located in the separation ing the wall ends supporting the pillars into monolithic trapezoids by means of a mortar lending to the brickwork of the ends a tensile resistance. The accompanying drawing is a vertical section through the middle plane of a pillar and a regenerator wall bearing said pillar.

' The silica pillar or sidel wall I rests upon the chamotte wall 2. 'I'heir meeting plane AA is arranged in such a way that the coeilicient of friction of brickwork Iv upon brickwork 2 is as low as possible.

By taking the necessary precautions, this coefficient of friction may be reduced to a value of 0.35 approximately. Along the horizontal plane AA, the vertical pressure P per running meter will be equal to the weight of one meter of pillar, and the horizontal friction stress equal to 0.35 P. The resultant R of both stresses will be at an ngle of about 20 to the vertical. If, from the 1| ower ends B of the wall 2, straight lines BC are awn at an angle of 20 to the vertical, a

,s subject to the stressesR along the length CC "n the sliding joint.` The stresses R are subtantially balanced by the reactions R' occurring n the prolongation of the stresses R. It results hat, when the silica pillar expands, the whole of UNITED STATES com: ovnN` Franz Florent Raoul Andr Gilles, Uccle-Brussels, Belgium, assigner to "Socit Gnrale de VFours Coke, Systmes. Lecocq, Socit Anonyme, Brussels, Belgium, a company Application November 24, 1937, Serial No. 176,151 In France December 1.-, 1930 s claims. (ol. zoeessi plane of the silica-and the chamotte and bindrapezoid BCCB will'be formed. This trapezoid PATENT OFFICE However, upon expansion of the silica pillar, 10

the two outer triangles ABC of the wall are subjected to outwardly directed stresses and are liable to crack.

To avoid this formation of cracks or crevices,`

it is only necessary to make the joints of the two trapezoids ABED with hard setting mortar so as to build two monoliths.

It should be mentioned that the monolithic trapezoids ABED have a thickness equal to that of the wall of which they form a partand 'do not take up any space in theregenerator chambers pl'Opel'.

These two monolithic trapezoids are subjected to the horizontal stresses F arising from the friction along the lines CA of the sliding joint.

The stresses F have a tendency to rock the trapezoids about theiredge B, but this movement is prevented by the pressure of the brickwork mass EDDE which must be displaced before a tilting of the monolithic blocks ABED can occur.

Both monolithic blocks may thus be considered as solids embedded at their bases and subjected at their top to horizontal stresses.

As a result there is a bending moment in each of their horizontal layers.

On the other hand, the monolithic blocks are also subjectedalong their horizontal layers to a pressure due to the weight o f the pillar and the weight of the wall proper. This pressure results in a decrease of the stresses due to the bending moment andmakes it possible, without giving to. the bases EB of the trapezoids too great a length, to limit the tensile strength in the monolithic brickwork to not more than 2 kg. per square 45 I centimeter, which it can take up quite safely.

What I claim is: V 1. In a coke oven battery, a lower brickwork structure for the regenerators having a wall transverse to the battery and an upper structure 50.

for the coking and combustion chambers having a wall transverse to the battery and resting on the rst mentioned transverse wall with a sliding joint, said rst mentioned wall comprising trapezoid end sections each having-an outer vertical 55 2 k e,i0s,000

side andrreach resting on its lower larger base directly beneath the coking and combustion chamf bers, said trapezoidend sections being jointed with a setting mortar to form monoliths 'where-l by the tensile stresses occurring in said trapezolds l aresafely resisted by the monolithic sections without fracture.

2.A coke oven battermss claimed claim 1,

in which the lower structure consists o! chamottc bricks and the upper structure consists 0i.' silicon.

3. A coke oven battery, es claimed in claim l. in which the upper structure consists of a material having a higher heat expansion coemcient than the brlckworklof the lower structure.A

RAOUL ANDR amm.

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