DE1160775B - Lining for ovens and containers operated at high temperatures - Google Patents

Description

Lining for furnaces and vessels operating at high temperatures The lining of vessels and furnaces that operate at high temperatures z. B. pig iron mixers, cement rotary kilns, shaft kilns for burning lime, etc., generally consists of a wear lining, a permanent lining, from the inside out, a back wall and an insulation, which on the generally existing one Sheet metal jacket.

The lining should be as tight as possible to avoid a leading edge Avoid corrosion in the joints.

The thermal expansion of the masonry of such a furnace or container must be caught to a considerable extent in the masonry itself, since the free The possibility of expansion is generally limited by a sheet metal jacket.

Part of the thermal expansion is absorbed by the insulating layer, which may be crushed in the process; the other part must be provided by and appropriately arranged expansion joints and / or expansion gaps are caught in which the masonry should grow in when heating up and closed when the operating temperature is reached meant to be.

If the expansion joints do not close, corrosion accelerates on them Grout in front, especially if it is an oven or container for liquid Acts well, as this can then easily penetrate the masonry. But they are If expansion joints are too tight, very high pressures arise in the masonry that are directly can lead to the destruction of the brick lining, but at least the wear resistance greatly reduce the lining. In any case, this means that the expansion joints have closed a movement in the masonry, d. H. a shift in the individual layers of masonry to each other, as the individual layers in relation to the temperature drop in the masonry expand differently. These shifts in the masonry layers take place In addition, unevenly over the entire cross-section of the furnace, as the heating to operating temperature can never be done so evenly that the same expansion effect is triggered. Play the movements of a brickwork essentially in the joints, which lose their tightness as a result, what in turn favors wear.

Attempts have already been made to fill these joints with cardboard and the like, to compensate for the movements of the individual wall sections against each other. Such However, fillers have the disadvantage that they are at the latest at the respective operating temperature char to a crumbly, powdery mass that has no bond between the individual masonry parts.

According to the invention is now between the wear lining and the Permanent lining provided an intermediate layer made of a material, which at deeper Temperatures can yield to the pressure, but at higher temperatures to a jointless layer hardens.

This intermediate layer should also fulfill the task of wear lining and permanent lining to be sharply separated from each other, which is a substantial relief is achieved when renewing the wear lining.

A tar-bound layer is ideally suited as an intermediate layer Carbon rammed earth in the diameter of the furnace or vessel to be lined adjusted strength between the wear lining and the permanent lining introduced will. The advantage is used that the mass at low temperature, So when warming up, it is soft and easily compressible, with some of the tar escapes. With increasing temperature, i.e. when the operating state is reached solidifies the mass by cracking the residual tar to one opposite the Attacks by metal, slag, etc. are known to be resistant bodies. Is the wear lining Wholly or in individual places, the attack on the permanent fodder becomes held by the intermediate layer. Because the intermediate layer has now hardened Carbon mass represents a seamless whole, is an ingress of metal, Slag etc. in the permanent feed is very difficult.

In the figure, the invention is based on an exemplary embodiment shown schematically, the invention not being limited to this one exemplary embodiment is limited. In the figure, 1 is the wear lining, 2 is the permanent lining, 3 the brickwork. 4 the insulation and 5 a sheet metal jacket. Between the wear lining 1 and the permanent lining 2, an intermediate layer 6 is provided, which is expediently made of tar-bound carbon rammed earth.

Claims (1)

Claim: Lining consisting at least of wear lining and permanent lining with an intermediate layer for ovens and containers operated at high temperatures, characterized in that a layer of tar-bound carbon rammed earth is introduced between the wear lining and the permanent lining, which at lower temperatures is created in the masonry when heating Pressure yields and hardens at higher temperatures, at the latest at the desired operating temperature, to form a seamless layer. Documents considered: French Patent No. 1195 773.