DE2541983C2 - Process for evaporating the lining of an industrial furnace - Google Patents

Description

25th

For the sake of economy, the ceramic lining intended for an industrial furnace is not fired in a production facility specially set up for this purpose, but in the associated industrial furnace itself when it is first started up. Often such industrial kiln, such? '<N cement rotary kiln, structurally ill-suited for the uniform heating of the refractory lining at the first start-up. It cannot be avoided that part of the inner surface of the lining is heated up particularly quickly. The inner surface glazes there before the physically bound mixing water can completely evaporate. During further heating, vapor bubbles develop inside such a lining, which destroys its still plastic structure.

In order to avoid this, it is known from German patent specification 15 58 588 to perforate the lining in the industrial furnace before heating it up. However, the evaporation channels created thereby weaken the subsequent process product and can therefore not be introduced in any small grid dimension. In addition, these evaporation channels do not communicate with each other. Both of these result in incomplete evaporation at the beginning of the heating process, so that steam pockets can remain in the lining material during further heating and rejects are then produced.

To avoid this deficiency in a method for evaporation of the refractory monolithic lining of an industrial furnace when it is first started up, by forming evaporation channels, it is proposed according to the invention that hemp ropes be laid out on the inner surface of the metallic furnace shell and fixed on an organic basis by adhesive strips or llaftklcbcr, after which The monolithic lining is layered and perforated in a manner known from the past, and finally the furnace is heated up.

During the stamping or sprinkling and ^h ~> 'inch in the first phase of deep opening, the! Long layers such as wicks, which are physically bound: withdraw the mixing water from the monolithic lining and hold it in the outermost area of the lining, which is last heated when the lining is so solid that it can no longer be blown up by steam stresses.

This is especially true if, in a further development of the invention, the hemp ropes are reticulated and into at least one The face of the later lining can be laid. The water vapor that forms can there without harmful overpressure escape.

In a further development of the invention, the design the hemp ropes and then the perforation through appropriate punching out of a template take place through. This ensures that the pierced evaporation channels converge inwards with the hemp ropes and the evaporation via the entire volume of the lining takes place without any significant hindrance, even if the Grid spacing of these perforations is chosen to be large, so as not to reduce the strength of the process product affect.

The method according to the invention is illustrated in the figures using the example of a cement rotary kiln.

Fig. 1 shows an axial partial section through the discharge end of the furnace drum,

FIG. 2 shows a partial section in plane II / II from FIG. 1.

The furnace construction is known. On the inner surface of the supporting cylindrical metallic furnace shell 2 sits the refractory lining, namely in the inlet-side front area as masonry 6, in the mechanically and thermally particularly stressed rear, the expiring end in the form of a monolithic stamped or injection-molded lining 7. Den rear end-face closure form cast segments 3 made of heat-resistant steel, which with the Furnace shell are screwed.

In a known manner, heat-resistant cast anchors 8 are welded in the rear part of the Ofenmar.tels 2 to the Lining to give a better grip.

First of all, axially running, thinner hemp ropes 4 are placed on the inner surface of the furnace shell and extend outward in a wick-like manner through the joints between adjacent end-face support segments 3, as well as at least one thicker hemp rope 1 in the circumferential direction of the furnace shell 2, crossing or touching the axial ropes 4 in a net-like manner. All ropes are fixed to the furnace shell 2 by adhesive tape or adhesive strips.

Then is Stampcn. Shake or spray the refractory monolithic material and, when it has set sufficiently. perforated, whereby by using a lay-up template, not shown, when laying out the hemp ropes and when introducing the evaporation channels 5 generated by the perforation, it could be ensured that these are at least partially connected to the hemp cords 1,4 distributed in the form of a net.

Finally, the stove is heated for the first time in the known way. The hemp ropes initially absorb the physically bound Anniach water from refractory eggs Delivery 7 and leave it otin for further mailing. Significant overpressure between the frontal ci Support segments 3 or the. Evaporation channels "> escape in vapor form and burn ·] ^ hlielüu ι ■ ·. without leaving any noteworthy residues' .eriii. / iii-.Tj. so d, ii. additional Ausdampfkanäie results ::,.

For this purpose 2 sheets of drawings

Claims (3)

Patent claims: 1. Process for evaporation of the refractory monolithic lining of an industrial furnace its first start-up through the formation of evaporation channels. characterized, that on the inner surface of the metallic furnace shell (2) hemp ropes (1, 4) laid out and through Adhesive strips (9) or pressure-sensitive adhesives are fixed on an organic basis, after which it is known per se Way the monolithic lining (7) is piled up and perforated and finally the furnace be fueled. 2. The method according to claim I _1, characterized in that the hemp ropes (1, 4) are designed to be reticulate and extending up to u in at least one end face of the lining (7). 3. The method according to claim 1 or 2, characterized in that the design of the hemp ropes and then the perforation through corresponding punchings of a Ausiegeschabione take place.