DK157000B - PROCEDURE FOR PREPARING A ILLUSTRATED LINING, NAME FOR HEATING OVEN - Google Patents

Description

DK 157000 B

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a method of producing a single or multi-layer refractory lining for ceilings and / or walls in heating furnaces, for example stoves, swing beam ovens and pit furnaces, or crucibles for metal, such as aluminum melting furnaces, iron or steel stoves. must withstand the high process temperatures of these furnaces and crucibles.

Refractory linings of this kind are manufactured differently. They are either applied directly to the furnace wall or to an intermediate layer or to an insulating layer. In the first case, it is a single-layer lining; in the other cases, the lining consists of several layers. Depending on the nature or nature, the refractory mass can be sprayed or stamped on.

15 For example, spraying is used in connection with the cement injection method, using a water-binding concrete or a water-curing mass, which is first mixed with the necessary water volumes at the nozzle estuary. Plastic building materials have not previously been able to spray 20. These building materials are delivered as a finished mass in lump form to the place where they are used, applied in the same form behind an associated formwork and compacted layer-wise with a hammer.

This machining method has both disadvantages in technical and economical terms. In one case, depending on the layer thickness of the lumps, the degree of compression decreases continuously in the stump direction, while in another case, as a result of the layered laying and subsequent stamping of the lumps, layer formation occurs across the stump direction as well as a insufficient interconnection between the individual lumps.

The inhomogeneous compaction and the cracks that occur after short-term use are points of attack for gaseous and liquid substances which not only greatly degrade the durability of the refractory lining, but also induce

DK 157000 B

2 that damage the housing behind the casing. Furthermore, in this method of machining, it is not always possible to avoid that previously inserted ceramic anchors are damaged by the pneumatic or mechanical working hammer, so that the result is damage to larger ceiling and wall sections.

For these technical disadvantages, the considerable costs for assembly work, for costly formwork and the delivery time are covered.

It is an object of the invention to avoid the aforementioned disadvantages and thus to increase the durability of the refractory lining and to provide an inexpensive and simple assembly.

This is achieved according to the invention by a method which is peculiar to the characterizing part of claim 1.

According to the invention, compressed air is used instead of trunk hammer, which has a dual function, namely in the transport of the machinable building material and in the application of homogeneous and layer-free, compressed building material on the casing surfaces for required application thickness.

In order for a plastic building block to be sprayed, the amount of air, working and compression pressure, as well as material consistency and illumination in transport tubes used for this, must be in a mutually compatible relationship. If all requirements are met, an optimal machining of such a building material is possible.

A further advantage of the method according to the invention lies in the fact that the fixed and fixed ceramic anchoring stones built into the spraying process are not subjected to damage and mechanical overload by manually held stamping hammers and therefore retain their function as holding means.

In economical terms, the method 35 of the invention entails a saving time saving which amounts to more than half of known application rates.

DK 157000 B

3 methods and a saving of expensive formwork.

Example 5 The pneumatic casing with plastic building stock is made with a rotor machine known per se, where the plastic building stock is used in granular form. Depending on the transport capacity, transport and compression air is used from 4.0 to 18.0 Nm3 of compressed air per day. mi-1 o nut from a compressor with a compression pressure of at least 6.0 bar. The pore holding building mass for air is from 1: 2 to 1: 4. The rotating machine or nominal output of the rotor machine is between 2.0 and 6.0 m3 per hour. Depending on the consistency of the plastic building stock, there may be a reduced nominal output, which amounts to 2.3 to 7.0 tonnes per year. hour.

Depending on the performance stage, transport hoses with illumination diameters of 32 to 50 mm are used. Compressed air consumption, depending on the amount of transport and hose size 20, is between 4.0 and 18.0 Nm3 per unit. The following data is obtained:

Rated output m3 / hour 2 3 4 3 4.5 6

Air flow rate Nm3 / min 6 10 10 10 10 16 25 Internal tube diameter in mm 32 50 50 50 50 50

The hose diameters obtained from the table correspond to the individual services, refer to the nominal performance of the rotor machine 30, and are obtained only with a slightly rippling building mass.

Compressed air with a pressure of 6.0 bar can be found in almost any building site in sufficient size. Advantageously, the plastic building mass is applied with a rotor machine having a nominal output of 4.5 m3 / hour, with an air flow of approx. in m3 / minute at 2.5 bar at the end of the hose and

Claims (4)

1. A method of producing a multi-layer refractory lining for ceilings and / or walls in heaters, for example stoves and pit furnaces, or crucibles for metal, such as aluminum smelting furnaces, iron or steel stoves, which lining should withstand these 10 furnaces and crucibles characteristically high process temperatures, characterized in that as a material for the refractory layer of the furnace or crucible in the refractory lining, a chemical-ceramic curing plastic mass with a content of 25-94 wt% is chosen 15 Al203, and that the mass is applied to the roof and / or the walls as granules by air with a working pressure of 2.0-4.0 bar and an amount of 4-18 Nm3 / min at a mass-to-air ratio of 1: 2-1: 4 into an inherently non-layered layer, thereby homogeneously compressed. 2. A method according to claim 1, characterized in that the plastic mass is pneumatically applied to a large flat, monolithic and non-layered layer itself. 3. A method according to claims 1 or 2, characterized in that the surface of the pneumatically machined plastic mass after finishing the application is roughened. Method according to any one of claims 1-3, characterized in that the mass is pneumatically applied to the roof and / or walls in separate fields.