CS216445B1 - A method of making refractory fibrous insulation layers - Google Patents

Abstract

The invention provides a method of applying and forming insulation from refractory fibers on an existing screed or on suitable substrates. The insulation is made by applying dry fibers, which are mixed with a binder solution in the nozzle mouth, or on a substrate coated with refractory putty or mortar. The thickness is 1-10 cm.

Description

The invention relates to a method of forming refractory insulating layers of ceramic refractory fibers. Insulation layers are created directly on site by spraying.

Insulation layers of ceramic refractory fibers have hitherto been produced in such a way that they are formed from fibrous refractory material by molding. products (thatch, felt, mats, papers and the like); wet and these are fixed mechanically or by gluing on the construction site to the material to be insulated. For some purposes, plastic, sealants and dispersions containing ceramic fibers * are produced in a dispersed medium. The sealants are applied by spraying, fiber dispersion by pouring or spraying - the fiber dispersion is sprayed onto insulated areas by means of compressed air. !

For the processing of fibers into boards, dispersions and the like. a large excess of dispersion medium is required for wet pulping (e.g. water in the production of boards by paper technology), which must be removed by suction, pressing, drying and the like. Further, in the transport and handling of shaped articles, a considerable part of them often deteriorates. Insulation of complicated or inaccessible parts of thermal aggregates is difficult from shaped products.

These drawbacks are solved by the method of applying refractory fibrous insulating layers, which is characterized in that the loose packaged refractory fiber (wadding) is disintegrated without the addition of liquids, by means of a stream of air the fiber is carried through a nozzle onto a material to be protected by the refractory insulating layer. The fibers are either wetted in the nozzle with a solution or dispersion of an inorganic, organic binder or a mixture thereof, or applied to a 1 to 10 mm thick adhesive layer formed from a refractory mastic or refractory mortar on the material to be protected by the fibrous insulation. The deposition is terminated after the desired depth of refractory fiber insulation has been reached. After drying, the insulation has a bulk density of 80 to 300 kg m &^lt; ^{3 >} according to the selected operating conditions (air pressure and quantity, binder amount and concentration, nozzle distance from the application site).

This process partially replaces the manufacture of molded articles from refractory fibers (fiber thatch), requiring large amounts of process water. The deterioration of the shaped articles during their transport to the construction site is excluded, as the easily manipulated packaged loose fiber (refractory cotton) is used for the proposed method. Furthermore, the invention makes it possible to produce insulating layers even in places for the assembly of shaped articles which are difficult to access and in places with a large, rugged surface.

Example: Fiber: Ceramic refractory fiber with a ratio of oxides of SiO, / AL, CL = 0.5 - 1.1. thickness, r Z. Z. J / [single fibers 1 to 10 μιη, fiber length 1 to .7 km, granule content 12% (w / w). s; Binder: Silicic acid solution, stabilized. Dry matter content 30%, viscosity 3 m Waist at 20 ° C. It can be diluted with water in a ratio of + 1 before use.

Equipment: Three-point dry pulper was used. The transport of the pulped material provided an air flow (pressure of 0.2-0.6 MPa), in the main jet, the fiber stream was humidified through three auxiliary internal jets with binder solution. The ratio between fiber and binder was adjusted by air pressure so that the resulting layer contained 0 to 20 wt. dry matter of the binder, preferably 8%.

A stream of wetted refractory fibers was applied to the substrate to be insulated (refractory ceramics, steel)

^) without previous modification ·

b) on a substrate treated by applying a 2 mm layer of refractory sealant in alternatives using, except for the use of a binder in a nozzle.

In this way, a 5-6 cm thick fibrous fireproof insulation layer having a density of 220 kg m ³ (after drying), including a harder surface layer on the hot side, an insulation formed by increased binder dosing during application, was produced. Said method of applying the refractory fiber insulation can be used in all thermal insulation work alone or in combination with known shaped refractory fiber insulation elements. The proposed method also allows to do scouring and hot insulation treatment.

Claims (3)

OBJECT A method for producing refractory fibrous insulation layers having a bulk density of 80 to 300 kg m-3, characterized in that the refractory fibers are pulverized in a dry state and carried through the air passage through a nozzle from which they are projected onto a substrate to be insulated. 2. A method according to claim 1 wherein the fiberized material is wetted in a nozzle by an aerosol of an inorganic or organic binder or mixtures thereof. $ 3. A method according to clause 1 or 2, wherein the dry, fibrous material is poured through the air passage onto a substrate coated prior to application of the refractory fibrous insulation with a heat-resistant sealant or refractory mortar. 216445