After the circular tunnel kiln uses the ceramic fiber module for the insulation cotton of the circular tunnel kiln, it has the advantages of large production capacity, reduced fuel consumption, long service life, high degree of mechanization and automation, and good working conditions.
The structure of the circular tunnel kiln and the selection of insulation cotton
The requirements for the kiln roof structure: the material should withstand high temperature for a long time (especially the burning zone), light weight, good thermal insulation, tight structure, no air leakage, and conducive to the reasonable distribution of airflow in the kiln. The general tunnel kiln body is divided from front to back into a preheating section (low temperature section), a firing and roasting section (high temperature and short), and a cooling section (low temperature section), with a total length of about 90m~130m.
The low temperature section (about 650 degrees) generally uses the 1050 ordinary type, and the high temperature section (1000~1200 degrees) generally uses the standard 1260 type or 1350 zirconium aluminum type. The structure of the circular tunnel kiln insulation cotton is made by using ceramic fiber modules and ceramic fiber blankets.
The use of ceramic fiber insulation modules and layered blanket composite structure can reduce the temperature of the outer wall of the furnace and extend the service life of the furnace wall lining; at the same time, it can also level the unevenness of the furnace lining steel plate and reduce the cost of the insulation cotton lining; in addition, when the hot surface material is damaged and an unexpected situation occurs and a gap is generated, the flat layer can also play a role in temporarily protecting the furnace body plate.
Advantages of using ceramic fiber module lining for circular tunnel kiln insulation cotton
1. The volume density of ceramic fiber as lining is low: it is more than 75% lighter than the lightweight insulation brick lining and 90%~95% lighter than the lightweight castable lining. It reduces the steel structure load of the kiln and extends the service life of the furnace.
2. The thermal capacity (heat storage) of ceramic fiber as lining is low: the thermal capacity of ceramic fiber is only about 1/10 of that of lightweight heat-resistant lining and lightweight castable lining. The low thermal capacity means that the kiln absorbs less heat in reciprocating operation, and the heating speed is accelerated, which reduces the energy consumption in the furnace temperature operation control, especially for the start-up and shutdown of the furnace.
3. Ceramic fiber furnace lining has low thermal conductivity: The thermal conductivity of ceramic fiber furnace lining is less than 0.1w/mk at an average temperature of 400℃, less than 0.15w/mk at an average temperature of 600℃, and less than 0.25w/mk at an average temperature of 1000℃, which is about 1/8 of lightweight clay bricks and 1/10 of lightweight heat-resistant linings.
4. Ceramic fiber furnace lining is easy to construct and easy to operate. It shortens the construction period of the furnace.
