Method for setting expansion joints in refractory bricks

In high-temperature environments, refractory bricks will generate stress due to thermal expansion. Without appropriate measures, it may lead to cracking, detachment, and even damage to the furnace structure of the bricks. The setting of expansion joints is to reserve a certain space in the brick structure to accommodate thermal expansion at high temperatures, thereby avoiding stress concentration and failure. This article provides a detailed introduction to the method of setting expansion joints, as follows:

1、 Principles for setting expansion joints

1. Reasonably determine the width and spacing of expansion joints based on the working temperature of the furnace and the expansion coefficient of refractory bricks;

2. Expansion joints should be set in appropriate positions to avoid stress concentration and damage;

3. The filling material for expansion joints should have good high-temperature resistance and sealing performance to prevent high-temperature gas leakage and erosion.

2、 The method of setting expansion joints

1. Determine the position and width of the expansion joint: Based on the structure of the furnace and the expansion coefficient of refractory bricks, determine the position and width of the expansion joint. Generally speaking, expansion joints should be set at the junction of bricks or at locations prone to stress concentration.

2. Fill the expansion joint: After the width of the expansion joint is determined, appropriate filling materials should be selected for filling. The commonly used filling materials are refractory fiber felt, asbestos rope, plywood, cardboard or polystyrene foam board, etc. The filling material should have good high-temperature resistance and sealing performance to ensure that the expansion joint can still maintain a good sealing state at high temperatures.

3. Fixation: After filling the expansion joint, measures should be taken to fix the brick to prevent it from moving or deforming under high temperature. Special fixtures or anchors can be used to secure it, ensuring its stability and safety.

The setting of expansion joints for refractory bricks is a key measure to ensure structural stability in high-temperature environments. By reasonably determining the position and width of the expansion joint, selecting appropriate filling materials, and fixing measures, the thermal expansion problem caused by high temperature can be effectively alleviated, ensuring the stability and safety of the furnace structure.