Ceramic fiber thermal insulation

Thermal oxidizers must be built to provide the residence time and temperatures to achieve the desired destruction efficiency (DE). As such, thermal oxidizers are comparatively larger than catalytic oxidizers since their residence time is two to four times greater. Historical designs of thermal oxidizers were comprised of carbon steel for the outer shell and castable refractory or brick as the thermal liner (a refractory is like a cement, which is put on the inside of the rector shell to act as a thermal insulation barrier). Modern units are designed and built using ceramic fiber insulation on the inside, which is a lightweight material, and has a relatively long life. Old refractory would tend to fail over a period of years by attrition of expansion and contraction. 

Modern low-density insulation such as those based on ceramic fibers can be used to save energy in plant operating on a batch basis. The low thermal mass permits a rapid heating and cooling period that can save a substantial amount of energy. With continuously operating plant the advantages are not so pronounced. 

For pure thermal insulation in very clean atmospheres, insulating refractories may be used. These types of refractories are normally very lightweight and can be purchased as brick shapes, as castables or refractory concretes, and as ceramic fiber. 

Cmtinuous Laminated Board. Laminated board with incombustible facing materials (glass fiber, ceramic, alumina-paper), or kraft paper is also widely used as a thermal-insulating building material. For example, laminated board is used for roof, ceiling, wall, and floor applications and for refrigeration storehouses. For producing continuous... 

The fibers or the yarn or rovings made therefrom can be processed to fleeces or mats (non-oriented semi-finished product) and textiles, lattices or meshes (oriented semifinished products) and can be utilized as such e.g. for thermal insulation or as filter materials, or in composites with other materials e.g. for fiber-reinforced polymers, metals or ceramics. Fibers are generally marketed after surface treatment (chemical modification, annealing, smoothing) to optimize their application and processing properties. 

These fibers are, due to their high thermal stability, particularly suitable for applications in high temperature thermal insulation and for the manufacture of metal matrix and ceramic matrix composites. They arc clearly superior to metal materials due to their lower weight, particularly in the lightweight construction of accelerated structure elements for which the basic material should represent an improve-... 

Preparation of Ceramics of Controiied Thermal Conductivity 193 17.3.6.3. Preparation of Oxides of Low Thermai Conductivity 17.3.6.3.2. Ceramic/Glass Fiber Biank Insulation. 

Ceramics used for thermal insulation of microwave caskets include alumina, aluminosilicates, mullite, and fused silica, each of which is relatively transparent to microwave radiation and thus have low dielectric loss at room temperature. The insulating materials included in the casket are typically in the form of ceramic fibers, fiberboard, or a granular bed of ceramic... 

KaowooL [Thermal Ceramics] Ceramic fiber insulation. 

Refiractory Sheet [Zircar Prods.] Ceramic fiber reinforced alumina prods., h temp, thermal insulation. 

The sample is contained in a 1 by 10-mm diameter indentation machined in the surface of a silver heater block. The circular block is 25 mm in diameter and it is heated by two 2.6-Q Nichrome wire heaters. It is contained in an enclosure, 55 mm square and 13 mm thick. The heater is thermally insulated from the main body of the sample holder by a thin layer of ceramic fiber insulation. The sample side of the holder is enclosed by a quartz plate, 50 mm on an edge by 2 mm thick, which is held firmly in place by two metal strips. Each metal strip is fastened to the holder by two thumb screws they (and hence the cover plate) can easily be removed to facilitate sample... 

Carbon and ceramic fibers are usually embedded in a matrix. There are applications in the fields of thermal insulation, catalyst support, filters, porous electrodes, and battery separators where they are utilized as mats or felts, or with a small amount of a binder. 

Si02 is probably the most widely used ceramic material. Silica is an essential ingredient in glasses and many glass ceramics. Silica-based materials are used in thermal insulation, refractories, abrasives, fiber-reinforced composites, laboratory glassware, and so on. In the form of long continuous fibers, silica is used to make optical fibers for communication. Powders made using fine particles of silica are used in tires, paints, and many other applications. 

Interna] Insulation The practice of insulating within the vessel (as opposed to applying insulating materials on the equipment exterior) is accomplished by the use of fiber blankets and hghtweight aggregates in ceramic cements. Such construction frequently incorporates a thin, high-alloy shroud (with slip joints to allow for thermal expansion) to protect the ceramic from erosion. In many cases this design is more economical than externally insulated equipment because it allows use of less expensive lower-alloy structural materials. 

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