DE2541983A1 - Aiding removal of moisture from monolithic furnace linings when fritti - by incorporating hemp ropes which act as capillary channels - Google Patents

Abstract

The network of hemp rope is secured to the shell of the furnace and the monolithic refractory is then cast in place perforated by channels running radially from the shell to the inside of the furnace. These channels are associated with the rope network. When the furnace warmed up initially the hemp ropes suck up moisture uniformly from the refractory as it dries out and this water passes out through the perforated channels into the furnace interior. When the normal operating temperature is reached the ropes and their cement burn away without residue leaving a further series of channels in the refractory. Used in industrial ovens and furnaces which have cast or formed refractory linings requiring to be dewatered before initial use. Provides uniform removal of water from the refractory allowing rapid initial heating up before use.

Description

METHOD OF EVAPORATING THE LINING OF AN INDUSTRIAL FURNACE

For the sake of economy, that is intended for an industrial furnace Ceramic lining not in a specially set up manufacturing plant fired, but in the associated industrial furnace itself when it is started up for the first time. Such an industrial furnace, such as a cement rotary kiln, is often not very constructive suitable for evenly warming the refractory lining at the first start-up. It cannot be avoided that part of the inner surface of the liner is particularly heats up quickly.

The inner surface glazes there before the physically bound mixing water could evaporate completely. When heating up further vapor bubbles arise inside such a lining, which gives it a plastic structure there gets destroyed.

In order to avoid this, it is from German patent specification 1 558 588 known to perforate the lining in the industrial furnace before heating. However the resulting evaporation channels weaken the subsequent process product and can therefore not be introduced in any small grid size. aside from that these evaporation channels do not communicate with each other. One still has both incomplete evaporation at the beginning of the heating process, so that when steam pockets may remain in the lining material and then scrap is produced.

To avoid this deficiency in a method for evaporation of the refractory monolithic lining of an industrial furnace when it is started up for the first time, by forming evaporation channels, it is proposed according to the invention that on the Inner surface of the metallic furnace jacket is laid out with hemp ropes and secured with adhesive tape or pressure-sensitive adhesives are fixed on an organic basis, after which in per se known Way the monolithic lining is piled up and perforated and last of all the Oven to be heated.

During the stomping or splashing and still in the first During the heating phase, the hemp deposits act like wicks, which physically do Eagerly withdraw bound mixing water from the monolithic lining and add it Hold on to the outermost area of the liner, which is the last to be heated if the lining has already solidified to such an extent that it cannot be damaged by steam stresses more can be blown up.

This is especially true when the hemp ropes are a further development of the invention reticulated and laid in at least one end face of the later lining. There the water vapor that forms can escape without damaging excess pressure.

In a further development of the invention, the design of the hemp ropes and then the perforation through corresponding punchings of a lay-on template take place through. This ensures that the pierced evaporation channels converge inwards with the hemp ropes and the evaporation over the entire volume the lining takes place without any significant hindrance, even if the grid spacing these perforations are chosen to be large in order to increase the strength of the process product not to impair.

Using the example of a cement rotary kiln, the invention is shown in the figures Procedure illustrated.

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 load-bearing cylindrical metallic furnace shell z sits the refractory lining, namely in the inlet-side front area as masonry 6, in the mechanical and thermal particularly stressed rear, the expiring end in the form of a monolithic stamped or injection-molded infeed 7. The rear end-face closure is formed by cast segments 3 made of heat-resistant steel, which are screwed to the furnace shell.

In a known manner, heat-resistant cast anchors 8 are in the rear part of the Oven jacket a welded to give the lining a better hold.

First, axially extending on the inner surface of the furnace shell thinner hemp ropes 4 placed, which through the joints between adjacent end faces Support segments 3 extend outwards in the shape of a wick, as well as at least one thicker hemp rope 1 in the circumferential direction of the furnace shell 2, the axial cables 4 crossing in a network or touching. All ropes are attached to the furnace shell by tape or pressure sensitive adhesive 2 fixed.

Then the refractory is made by stamping, shaking or spraying monolithic material delivered and, when it has set sufficiently, perforated, whereby by using a template, not shown, when laying out the Hemp ropes and when introducing the evaporation channels created by the perforation 5 could be ensured that this at least partially with the reticulated distributed hemp cords 1.4 connection.

Finally, the furnace is heated for the first time in a known manner.

The hemp ropes first suck up the physically bound mixing water from the refractory lining 7 and leave it without any noteworthy when heating up further Overpressure between the end support segments 3 or the evaporation channels 5 escape in vapor form and finally burn without leaving any noteworthy residues remain, so that there are additional evaporation channels.

Claims (3)

P A T E N T A N S P R Ü C H E: 1. Procedure for evaporation of the refractory monolithic lining of an industrial furnace during its first start-up Formation of evaporation channels, characterized in that on the inner surface of the metallic furnace jacket (2) hemp ropes (1,4) and covered with adhesive strips (9) or organic-based pressure-sensitive adhesives are filmed, after which they are known to sicn Way the Inonolithische lining (7) layered and perforated and, finally the oven can be heated. 2. The method according to claim 1, characterized in that the hemp ropes (1,4) network-shaped and designed to extend into at least one end face of the lining (7) will. 3. The method according to claim 1 or 2, characterized in that the Design of the hemp ropes and then the perforation through appropriate punchings take place through a display template.