What is the difference between roller kiln and tunnel kiln?

The difference between tunnel kiln, shuttle kiln and roller kiln:

1. Tunnel kiln. So the name suggests that its kiln body like a tunnel. In fact, the tunnel kiln in a broad sense contains roller kiln, cart tunnel kiln, push plate kiln, rotary kiln belongs to the scope of the tunnel kiln. Tunnel kiln in a narrow sense. Only refers to the cart tunnel kiln, but the tide called the push plate kiln, push plate kiln is a refractory plate directly bearing in the high temperature resistant rail, (such as corundum king brick rail or corundum ball rail can be in situ rolling) refractory plate a piece of a piece of the refractory plate, due to the refractory plate bearing the thrust of the limitations of the general is not long, the length of twenty meters, the short is a few meters, generally fired into high-temperature powder or special ceramics, the daily output is not large. Because the propeller directly push the refractory plate forward, called push plate kiln. Chaozhou's push plate kiln is a trolley-type tunnel kiln. Tunnel kiln due to continuous production, pre-tropical heat is basically brought by the flue gas of the firing belt supply of waste heat, due to the kiln wall is not like a shuttle kiln, there is no warming and then cooling of the cycle of heat loss, most of the high-temperature flue gas of the firing belt can be utilized as waste heat, so it is better than the gap-type kiln energy-saving effect. However, due to the cart or to go through the warming and then cooling, wasting part of the heat, its energy-saving effect and temperature difference is not as good as the roller kiln.

2, shuttle kiln. Gap production kiln, suitable for small batch production of many varieties, due to the flexibility of production, now many small and medium-sized ceramic porcelain factory are still using this kiln. But because it is gap type, kiln walls, carts to absorb heat and consume energy, the total comparison of energy consumption is relatively high, but through the kiln design and manufacturer's efforts, such as the use of high-speed burner fast firing, the use of lightweight refractory insulation materials to reduce the kiln heat storage, and some of the fast-firing shuttle kiln has been achieved with the old tunnel kiln comparable to the energy-saving effect.

3, roller kiln. Is a high-temperature ceramic sticks directly drive the refractory plate forward, loaded with product refractory plate directly bearing on the sticks, also known as Lola kiln. The earliest introduction is fired wall and floor tiles, no pallets, floor tiles directly on the stick, due to preheating, firing, cooling process temperature difference is very small, firing time from the past with shuttle kilns, tunnel kilns fired more than ten hours, a shortened minutes, so it is promoted to the art of ceramics, ceramics, along with the improvement of the quality of the stick, from the low-temperature type of gradual to the middle and high-temperature type of transformation. As the roller kiln is a refractory plate directly bearing on the in situ rolling sticks forward, it is not like a tunnel kiln to use a cart to absorb a large part of the heat, it is also much better than the tunnel kiln airtight. So it is better than the tunnel kiln energy-saving effect, one of its biggest flaws is the firing of high-temperature reduction of the product, the quality of the stick requires a higher stick, the use of silicon carbide sticks, can be a better solution to the firing of high-temperature ceramic products within 1350 ℃. But it has not yet solved the kiln change glaze, crystallization glaze firing, because it is faster.

The above analysis of the shuttle kiln, tunnel kiln, roller kiln, the general structure and advantages and disadvantages, the enterprise can be based on their own product mix, production and economic capacity to choose the kiln that suits their own:

1, for the daily output of less than 20m3, and more types of products, firing temperature of each, because of its own production capacity is difficult to meet the production volume of tunnel kiln, the recommended use of rapid firing shuttle kiln.

2, for the daily output or more than 20m3, but the glaze is complex, such as kiln glaze crystallization glaze requires a certain amount of constant temperature and cooling time, from the construction of the kiln on the economic considerations, can be used in the traditional shuttle kiln or electric shuttle kiln; if the kiln glaze or crystallization glaze is just part of the kiln, you can choose the rapid kiln, fast kiln is not only fast, but also can be slow. Slow, the temperature difference can be controlled very small. But slow energy saving effect is poor.

3, for the temperature of 1300 ℃ or less, the production of large art ceramics, ceramics, bathroom ceramics, it is recommended to use roller kiln, or large rapid shuttle kiln.

4, for larger production, higher height, heavier weight, higher temperature, single glaze color, you can use the cart tunnel kiln. Such as high temperature daily-use ceramics, bathroom ceramics.

The advantages and disadvantages of electric kiln and gas kiln: electric kiln due to the heat generator does not produce smoke, only the billet itself in the firing process of volatiles discharged on the shuttle kiln kiln can be very sealed, only a few exhaust holes, there is no smoke to bring out the heat. Firing 1200 ℃ below the low-temperature oxidative firing, now the production cost is lower than the gas kiln. It is measured in the electricity cost 0.8 yuan / degree, liquefied petroleum gas price of 6.2 yuan / KG, this ratio is an equilibrium point. With continuous electric roller kiln firing 1220 ℃ below the oxidation products, now the production cost is lower than the gas roller kiln more than 15%, but to a 200kva transformer, this investment is not small, there is still excess capacity of the transformer ceramic factory, can be in the pre-tropical or near the firing belt with the addition of electric hot wire with electric heat to preheat the warmth of high-temperature zone or gas, but the electric kiln can not be burned to restore the firing of 1260 ℃ above the higher quality requirements for the heating body, the price is more expensive. 1280 ℃ above the firing of the heating body to use silicon molybdenum rods. Silicon molybdenum rods are easy to aging, service life is not too long. Selection of electric kiln depends on the price of electricity, the average price of electricity is low in the region can choose electric kiln, in the case of high electricity prices, high prices of liquefied petroleum gas in the original kiln on the modification of electric heat is cost-effective, but to retain the original gas function.