Abstract: In order to reduce the temperature difference of tunnel kiln preheating zone from top to bottom, Thermostat burner and temperature distribution was researched by computer numerical simulation. The temperature difference of material zone in preheating zone of tunnel kiln is decreasing when the ratio (1.5%～10%), velocity (60～110 m/s) and temperature (0～500 K) of flame gas injected are increasing if the thermostat burner's other operation parameters are fixed. Burner thermostat suitable arrangement is staggered.

Key words: tunnel kiln%thermostat burner%numerical simulation%preheating zone%temperature difference