- Time:Jun 26, 2023
Due to the different working principles and structural designs of different types of kilns, the principles of reserving expansion joints of refractory bricks are also different. The following are the principles for reserving expansion joints of refractory bricks for several common kilns:
1. Reservation principle for expansion joints of vertical rotary kiln: In the masonry of vertical rotary kiln, one or more linear expansion joints are generally set along the longitudinal direction of the cylinder, and gaps are left in the upper and lower parts respectively. The location of the expansion joint should be selected according to the structural characteristics and mechanical requirements of the cylinder.
2. The reservation principle of the expansion joint of the horizontal rotary kiln: the horizontal rotary kiln usually adopts arc or zigzag expansion joints to adapt to the geometry of the cylinder. For larger horizontal rotary kilns, multiple bidirectional staggered expansion joints can be set according to design requirements to control thermal expansion and cold contraction stress.
3. Reservation principles for expansion joints of liquid bed kilns: liquid bed kilns usually adopt arc or circular expansion joints, and their positions should be reasonably selected according to equipment structure and operation requirements. The joint filling materials generally use silicate castables, special anti-expansion mud, etc.
4. The reservation principle of the expansion joint of the electric furnace: In the masonry of the electric furnace, it is necessary to set the expansion joint according to the layout of the resistance heating device and the structure of the furnace body. Generally, straight or arc expansion joints are used, and gaps are left on both sides of the heat resistance device.
5. Reservation principles for expansion joints of high-temperature furnaces: high-temperature furnaces usually use arc-shaped, circular or oblique expansion joints, and their positions should be selected according to the furnace structure and work requirements. The joint filling materials generally use silicate castables, steel fiber concrete, etc.
In short, in the masonry of different types of kilns, the location and form of expansion joints should be reasonably selected according to actual needs and design requirements, and appropriate filling materials and construction methods should be selected to ensure the reliability and sealing of refractory brick expansion joints. . In the process of use, it is necessary to strengthen inspection and maintenance, repair and replace the expansion joint filling material in time to prolong its service life.
