Continuous firing tunnel kiln is a modern ceramic thermal technology equipment, in addition to the ceramic industry, other industries such as refractories, abrasives, abrasive, bricks, such as production, also widely used in tunnel kiln.
Tunnel kiln, which began in 1765, when only on ceramic glaze color, in 1810, has can be used for bricks or pottery, however, are not ideal. Since 1906, only to burn porcelain body. Original famous tunnel kiln, is the base type, in the 1910 years later, was in the ways of improvement, including the Soviet Leningrad place design of the new tunnel kiln, a more advanced.
Tunnel kiln is usually a long straight tunnels, the sides and the top is fixed and the wall of the dome, lay at the bottom of the orbit of the kiln car. Combustion equipment in tunnel kiln in the middle of the two side, constitutes the fixed thermal belt - calcining zone, high temperature flue gas from the burning of the tunnel kiln front chimney or under the action of induced draft fan, the tunnel to the kiln head direction, gradually preheating into the innovation of the products at the same time, this paragraph constitutes the preheating zone of tunnel kiln. In tunnel kiln preheater blowing cold air, after a period of cooling tunnel stove products, blowing cold air flows through the products and after being heated, then sent to dryer as heat source of drying green, this constitutes the cooling zone of tunnel kiln.
Placed in the cart into the ceramic saggar, continuously by the entry of the preheating zone slowly into the common mechanical push (), and carrying finished burning car, will be introduced gradually by the cooling zone exports to (about 1 hour, to launch a car).
Tunnel kiln compared with intermittent old down-draft kiln, has a series of advantages.
A, continuous production, short cycle and large output, high quality.
B, using counter-current principle of work, so the heat utilization rate is high, the fuel economy, because of the heat and waste heat utilization are very good, so the fuel savings, a down-draft kiln can save fuel 50-60%.
C, sintering time is shorter, more common big kiln by seting out empty need 3 to 5 days, and tunnel kiln for about 20 hours can be completed.
D, and labor saving. Not only when the fire is easy to operate, and the operation of the kiln and the kiln are, outside of the kiln is very convenient also, improved the working conditions of operating personnel, reduce the labor intensity.
E, and improve quality. Preheating zone, sintering, cooling the temperature of the three parts, often keep a certain range, easy to grasp its firing rule, so the quality is better also, less breakage.
F, kiln and kiln furniture are durable. Because innovation is not affected by thermal shock, so long service life of kiln body, usually 5 to 7 years to repair again.
But the tunnel kiln building materials and equipment needed for more, so a large investment. As a continuous sintering furnace, so firing system should not be arbitrarily change, usually is only applicable to mass production and essentially the same products to firing system requirement, poor flexibility.