The choice of kiln fire refractory material seems simple and very complicated. Appropriate materials must have specific performance, such as high fire resistance, resistance to temperature changes, anti -mechanical and chemical effects, and insulation capacity. Although refractory bricks and refractory watering materials a few years ago were also used as the basic materials for masonry kiln and kiln lining, the development of thermal insulation and fiber materials has opened a new path for choosing kiln body materials to make the structure make the structure. Light. A few years ago, according to the operating temperature of the kiln, the thickness of the kiln wall can reach 1M. And using the current new material can only achieve the same efficiency as the original.
The heat insulation material has the characteristics of low thermal items and low heat capacity, which is common sense. At present, these insulation products constitute the foundation of various light industrial kiln structures. With other materials -Tao, light insulation clay resistance tiles, Mo Lai Shi warming bricks, lightweight rated jade bricks and refractory fibers are included in this group of products. The fire -resistant fiber is produced by a thermal chemical process, which is produced by the solution of pure kaolin or aluminum or aluminum salt solution for centrifugation or atomization.
The advantages of these refractory fiber products are mainly that they have low volume density and relatively low thermal capacity, low thermal conductivity and high resistance to temperature. The temperature range is 1200 ~ 1600 ° C. The disadvantage of fire -resistant fiber products is that the stability is poor, that is, they are only applicable to the inner lining of the kiln with low mechanical stress and corrosion. Due to the results of thermal force, the fibrous fiber structures have changed the fiber structure of the fiber, which change the fiber structure of various high -temperature fibers. In order to eliminate this lagging contraction effect, many methods have been used during production. Therefore, the contraction and compression effect -can be reduced from about 3%to 1%.
1: The advantages and disadvantages of fiber as a kiln lin
1.1 Advantages of intermittent kiln
① The temperature and cooling time are short, so the entire firing cycle is also short; ② low energy consumption; ② high yield.
1.2 For the tunnel kiln, it has the following advantages:
① Because the small section tunnel kiln is effectively used effectively, the best temperature balance can be obtained; ② has an exhaust gas treatment system to reduce environmental pollution:; ③ the quality of the finished product is more uniform; ④ with low temperature running or stopping kiln in a short time in a short period of time Possibilities; ⑤ If you provide the corresponding storage capacity, you can produce 7 days.
2: Disadvantages
Due to the low heat capacity of the all -fiber kiln lined, it is recommended that the all -fiber kiln lining is not applicable at the maximum temperature of sintering or insulation at the highest temperature. For this reason, in this case, the kiln's lining bricks should be mixed with insulation clay tiles or adhesive high -temperature fiber modules with insulation clay bricks.
Due to the changes in chemical corrosion of high temperature (stable Mo Lai stone crystal) under high temperature state, erosive flue gas or porcelain glaze fog; so it is not appropriate to use fiber kiln lining. In the restoring atmosphere (CO, H2, NH3, CH4) synthesis, the nuclear crystal and crystal generation will reduce the operating temperature, and the alkaline glaze (about 950 ° C) will react with the fiber to generate white garnet. Or positive stones. Sulfur dioxide fog can generate potassium sulfate to reduce the content of silicon dioxide.
In short, due to modern furnace lining technology, even if the insulation clay tiles are used or the full fiber lining is used as the insulation in the furnace, it has a growth trend, shortening the cycle of the masonry kiln. Especially for intermittent kiln, it becomes a convenient and fast possibility. However, these furnaces can also be used on the ceramic production tunnel kiln that can be used in a short process to adapt to the peak production period or maintains low -temperature operation kiln.
