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The Fire Resistance And Development Of Ceramic Fiber
Jun 29, 2018

In recent years, the application of ceramic fiber in the high temperature firing kiln has been increasingly expanded. All kinds of products made of ceramic fiber have good heat insulation effect, easy to use, especially small heat storage and so on. It is widely used in various types of furnaces and shows great efficiency in energy saving.


(1) varieties and properties: the most important index of ceramic refractory fiber is the diameter and thermal stability of the fibers. Al2O3SiO2 fiber is commonly used in the ceramic industry. According to the content of Al2O3, it is divided into different use range, and the Cr2O3 material is introduced to improve its fire resistance and antioxidant properties. In general, the fiber products with high alumina content and low impurity content such as iron oxide are pure white, and the fibers that introduce chromium oxide are sold with yellow color. The average diameter of the ceramic fiber is 24 microns. High temperature, high density and low thermal conductivity. If the fiber is thick and dense, the use effect is not ideal. The thermal stability index of fiber is more important. The range of shrinkage of Al2O3-SiO2 fiber at 1260 C is 3588%. The shrinkage is also directly affected by thermal stability.


Because of the low thermal conductivity, small density and light weight, the light steel support structure is used in the design and construction of the kiln, which makes the development of the ceramic kiln into the age of light weight of the kiln. The fiber is small in heat storage and suitable for rapid heating and cooling. The fiber is flexible and can be machined into grooves or openings, and has good ability to resist mechanical vibration and impact, and has good chemical stability. These advantages are the development of the new kiln and have an important impetus to the development of ceramic technology and industry. At present, the ceramic fiber products have: felt, blanket, block, loose fiber, fiber paper and various kinds of products in vacuum. The working range is generally at 8711427 degrees C. Under special circumstances, it can be used at high temperature above the limit temperature in a special case.


(2) masonry methods and precautions: refractory fiber felt, suitable for furnace lining can greatly improve energy efficiency. In general, organic binder is used to make fiber into tubular or sheet fabric. After building the inner wall of the kiln with high temperature lightweight refractory bricks, the ceramic fiber refractory felt can be attached to the inner lining. After burning, the fiber felt or board formed a certain rigidity and has a satisfactory recovery ability.


There are two methods for masonry fibers: one is to apply the felt blanket on one layer and one layer, and then riveted with a bolt. Generally, the temperature resistant metal tethered rod is adopted below 1222 C, and the ceramic riveting parts are adopted at more than 1223 degrees C. The hot side is filled with loose fibers and heat-resistant cement. Ceramic riveting also prevents fiber deterioration due to carbon deposition.  The second method is to use prefabricated assemblies, namely, prefabricated parts stacked with felt blankets or folded into a accordion preform with a wide 305mm felt blanket. Compared with the latter, the latter is the same material from the furnace shell to the hot surface, and the energy efficiency is higher, but the cost is higher. When the temperature rises, the joints formed by fiber preform masonry need to have a flexible fiber mosaic. The prefabricated components are easy to install, fast and easy to maintain, and only need to replace the damaged parts.


In terms of thermal efficiency, the way of layer application is superior to prefabricated parts. Because the fiber direction of the former is perpendicular to the heat flow, the stacked prefabricated composite fiber direction is parallel to the heat flow, the difference between the heat conduction of the two is about 2040%, for example, the precast assembly of the accordion fold is between the two, and the direction of the fiber is both parallel and vertical to the heat flow.


(3) prospects for development: as fuel prices continue to rise, fuel costs will become a bottleneck in the development of ceramic industry, and energy conservation will become more important. People are more and more concerned about the heat loss of the kiln. Some of them directly put a refractory ceramic fiber on the surface of the original refractory lining to improve the thermal efficiency. It is necessary to repair the obvious cracks or spalling parts on the kiln wall before adding them. However, thermal insulation bricks and refractory fibers can not be arbitrarily abused. So far, such as alkaline oxygen smelting furnace, cement rotary kiln and other lining, due to serious chemical erosion of high temperature, temporarily can not use fiber as lining.


For continuous heating equipment, such as ceramic tunnel kiln, the refractory ceramic fiber used as the inner lining of continuous heating equipment has been realized. According to the relevant data, the energy-saving effect of the refractory ceramic fiber in the fast pushing plate kiln and tunnel kiln is very significant. In particular, ultra high temperature heating, such as firing temperature in 1538 C 1649 C furnace, the use of refractory fiber energy saving effect is the best.


At present, all ceramic kiln equipment in Europe, America and Japan is made of ceramic fiber lining. Not long ago, the gas tunnel kiln was decomposed to such as the compartments of the carriage structure, and then shipped to the construction site assembly of the porcelain factory. All this was due to the use of ceramic fiber materials, which greatly saved the cost of the kiln and was more convenient. The research on promoting energy saving effect of ceramic fiber products from the aspect of material modification is also in progress.

  


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