What is a tunnel kiln?

Tunnel kiln is a modern continuous firing thermal equipment, which is widely used in the roasting production of refractory products. Tunnel kiln is a long and straight tunnel with fixed walls and vaults on both sides and at the top, and the kiln car runs on the track laid at the bottom. Sintering equipment is located on both sides of the middle of tunnel kiln, which constitutes a fixed high temperature zone-sintering zone. Under the action of the smoke exhaust machine at the front end of the tunnel kiln, the high-temperature flue gas generated by combustion flows along the tunnel kiln to the kiln head, and the products immersed in the kiln are gradually preheated, which constitutes the preheating zone of the tunnel kiln. Cold air is blown into the end of the tunnel kiln to cool the products in the back section of the tunnel kiln. The blown cold air flows through the product and is heated, then it is pumped out and sent to the dryer as the heat source for drying the blank. This part constitutes the cooling zone of the tunnel kiln.

superiority

Compared with intermittent old inverted flame kiln, tunnel kiln has a series of advantages. 1, continuous production, short cycle, large output and high quality. 2. It works by using the counter-current principle, so the heat utilization rate is high and the fuel is economical. Because of good thermal insulation and good waste heat utilization, the fuel is very economical, which can save about 50-60% compared with the inverted flame kiln. 3. The firing time is shortened. Compared with ordinary large kilns, it takes 3-5 days from kiln loading to kiln discharging, while tunnel kilns can be completed in about 20 hours. 4. Save labor. It is not only convenient to operate when burning the fire, but also convenient to load and unload the kiln outside the kiln, which improves the working conditions of operators and reduces the labor intensity. 5. Improve the quality. The temperature of preheating zone, sintering zone and cooling zone is often kept in a certain range, so it is easy to master the sintering law, so the quality is better and the breakage rate is less. 6. Kilns and kiln furniture are durable. Because the kiln is not affected by rapid cooling and rapid heating, the kiln body has a long service life and is generally repaired once every 5-7 years.