The material selection of the furnace lining material needs to comprehensively consider various factors such as furnace temperature conditions, usage conditions of ceramic fiber materials, furnace operating atmosphere, positive and negative pressure of the furnace gas, etc. The same ceramic fiber material has different operating temperatures due to different usage conditions (type of furnace heat source, gas composition and flow rate in the furnace, furnace operating system). Why should we choose refractory cotton ceramic fiber modules for special ceilings for kilns?
Based on the operating temperature in the furnace, the thickness of the thermal surface ceramic fiber module, and the total insulation thickness, calculate how low the temperature of the furnace outer wall is. The normal operating temperature of the high temperature section is ≤1050℃. The use of high-aluminum ceramic fiber modules with a long-term operating temperature of 1200°C can fully meet the working requirements of the conversion furnace and ensure a good service life. Because the temperature of the backing blanket drops greatly when it is far away from the hot surface, ordinary ceramic fiber with a long-term operating temperature of 950°C can meet the requirements.
Refractory ceramic fiber modules is a lightweight thermal insulation material. Compared with traditional thermal insulation materials, it has the following advantages:
1. Low bulk density: Ceramic fiber furnace lining is more than 75% lighter than lightweight insulating brick furnace lining, and 90% to 95% lighter than lightweight castable furnace lining. The use of fiber furnace lining can greatly reduce the load on the steel structure of the furnace and extend the service life of the furnace body.
2. Low heat capacity (heat storage): The heat capacity of ceramic fiber modules is only about 1/10 of the lightweight heat-resistant lining and lightweight castable lining, while the heat capacity of the furnace lining material is proportional to the weight of the furnace lining. The low heat capacity has a very significant energy-saving effect on the startup and shutdown of the heating furnace.
3. Low thermal conductivity: The thermal conductivity of ceramic fiber furnace lining is 1/10 of that of lightweight heat-resistant lining, and the thermal insulation effect is significant.
4. Simple construction: No expansion joints are required during the construction process, and construction personnel can start work after basic training.
5. Excellent resistance to thermal shock and mechanical vibration: fiber blankets and ceramic fiber modules are flexible and elastic. As long as the heated body can withstand it, the fiber folding module furnace lining can be heated or cooled at any fast speed and is not easily damaged.
6. No oven required: The furnace lining can be put into use after the construction is completed, and no oven procedure is required.
7. Good sound insulation performance: Ceramic fiber can reduce high-frequency noise with a frequency less than 1000 Hz. For sound waves less than 300 Hz, the sound insulation ability is better than commonly used sound insulation materials, and can significantly reduce noise pollution.
8. High thermal sensitivity: The thermal sensitivity of ceramic fiber modules is much better than that of conventional refractory fiber material furnace linings. The high thermal sensitivity of fiber furnace linings is more suitable for automated control of industrial furnaces.
9. Stable chemical properties: Ceramic aluminum silicate fiber is a neutral to acidic material. In addition to reacting with strong acids and alkalis, it is not corroded by other weak acids, alkalis, water, oil, and steam, and is not infiltrated by lead, aluminum, and copper.
With the development of refractory fiber production technology and application technology, refractory ceramic fiber products can meet the use requirements of different temperature grades from 600°C to 1400°C. From fiber cotton, blankets, felts to ceramic fiber modules, boards, special-shaped parts, paper, fiber textiles; from fiber cotton to fiber spray coatings, plastics, castables and other forms of secondary processing or deep processing products, fully satisfying various industries Different industrial furnaces have requirements for the use of refractory ceramic fiber products.
