Five benefits of setting kiln doors in tunnel kilns
author: Archie
2025-05-20
Built in the past, the small section of the tunnel kiln out of the mouth of the kiln door is not designed to give up the roasting of this effective means of control, not only affects the speed and quality of roasting, but also cause high energy consumption, for this reason, many small section of the tunnel kiln is now also on the mouth of the car to carry out renovation, according to the kiln door and the cooling fan, to achieve significant results.
1. Speed up the roasting speed
Advanced tunnel kiln outlet, are designed with kiln door and cooling fan with frequency converter, which is very effective in improving the roasting speed, turn off the kiln door, turn on the cooling fan, forced air to the kiln, pushing the wind forward, accelerating the rate of heat and cold exchange, and effectively promote the improvement of roasting speed.
Advanced tunnel kiln outlet, are designed with kiln door and cooling fan with frequency converter, which is very effective in improving the roasting speed, turn off the kiln door, turn on the cooling fan, forced air to the kiln, pushing the wind forward, accelerating the rate of heat and cold exchange, and effectively promote the improvement of roasting speed.
2. Improve the quality of roasting
In the past, small cross-section tunnel kiln, no design of kiln door and cooling fan, the use of full negative pressure roasting process, especially within the combustion of bricks, generally higher temperatures in the middle of the stacks, gathering a lot of radiant heat, should be through the convection of gas heat transfer to the high temperature pull away, but rely on the negative pressure pumping, it is difficult to the middle of the stacks of high-temperature gas uniformly pumped away because the air encounters high temperatures will be expanding, the higher the temperature, the expansion of the bigger, the corresponding pressure will be the bigger the gas resistance will be the bigger, so that the heat will be difficult to pull away smoothly. The higher the temperature, the greater the expansion, the greater the corresponding pressure, the greater the resistance encountered by the gas, so that the expansion of the gas in the middle of the brick stacks is difficult to pull away, and thus the heat will be gathered more and more, the temperature will be higher and higher, resulting in the middle of the billet stacks of products overcooked, which is the biggest disadvantage of the negative pressure baking one of the drawbacks. Due to the existence of this drawback, often resulting in the side and the top of the brick under fire, billet stack in the middle of the burnt brick, finished brick colour difference, affecting product quality, if the three gaps (side gap, top gap, stack gap) is slightly larger, the problem is more serious. But with the kiln door and cooling fan, it can be forced to send air to the kiln, in the middle and back of the roasting belt, the formation of positive pressure. The advantage of forming positive pressure in the kiln is that as long as there is a gap, regardless of the size of the gap, the wind will see the gap, not only will the billet stack in the middle of the gathering of high temperature gas to the top out, but also in the kiln on the temperature to play a better role in the mixing, so that the temperature tends to be more uniform. Because the section temperature is more uniform, so that the burnt brick colour difference is small, shrinkage consistency is strong, greatly reducing the quality of the outside of the good inside, or the outside of the good inside of the scorched quality problems, effectively overcome the negative pressure caused by the section temperature difference is big, the brick quality of the shortcomings of the poor.
In the past, small cross-section tunnel kiln, no design of kiln door and cooling fan, the use of full negative pressure roasting process, especially within the combustion of bricks, generally higher temperatures in the middle of the stacks, gathering a lot of radiant heat, should be through the convection of gas heat transfer to the high temperature pull away, but rely on the negative pressure pumping, it is difficult to the middle of the stacks of high-temperature gas uniformly pumped away because the air encounters high temperatures will be expanding, the higher the temperature, the expansion of the bigger, the corresponding pressure will be the bigger the gas resistance will be the bigger, so that the heat will be difficult to pull away smoothly. The higher the temperature, the greater the expansion, the greater the corresponding pressure, the greater the resistance encountered by the gas, so that the expansion of the gas in the middle of the brick stacks is difficult to pull away, and thus the heat will be gathered more and more, the temperature will be higher and higher, resulting in the middle of the billet stacks of products overcooked, which is the biggest disadvantage of the negative pressure baking one of the drawbacks. Due to the existence of this drawback, often resulting in the side and the top of the brick under fire, billet stack in the middle of the burnt brick, finished brick colour difference, affecting product quality, if the three gaps (side gap, top gap, stack gap) is slightly larger, the problem is more serious. But with the kiln door and cooling fan, it can be forced to send air to the kiln, in the middle and back of the roasting belt, the formation of positive pressure. The advantage of forming positive pressure in the kiln is that as long as there is a gap, regardless of the size of the gap, the wind will see the gap, not only will the billet stack in the middle of the gathering of high temperature gas to the top out, but also in the kiln on the temperature to play a better role in the mixing, so that the temperature tends to be more uniform. Because the section temperature is more uniform, so that the burnt brick colour difference is small, shrinkage consistency is strong, greatly reducing the quality of the outside of the good inside, or the outside of the good inside of the scorched quality problems, effectively overcome the negative pressure caused by the section temperature difference is big, the brick quality of the shortcomings of the poor.
3. Reduce energy consumption
Tunnel kiln designed with kiln door and cooling fan, can be forced to send air, not only to promote the temperature of the section of the roasting belt more consistent, and the fuel can be better sufficient oxygen combustion, heat can be given full play to the relative saving of fuel, from the actual energy consumption, the design of the tunnel kiln with kiln door and cooling fan, each kiln into a kilogram of products consumed fuel reduced by more than 50kcal.
Tunnel kiln designed with kiln door and cooling fan, can be forced to send air, not only to promote the temperature of the section of the roasting belt more consistent, and the fuel can be better sufficient oxygen combustion, heat can be given full play to the relative saving of fuel, from the actual energy consumption, the design of the tunnel kiln with kiln door and cooling fan, each kiln into a kilogram of products consumed fuel reduced by more than 50kcal.
4. Promote environmental protection to meet the standard
As fuel consumption is relatively low, emissions are low, less desulphuriser etc. is consumed and savings are made accordingly. Is not the kiln door or out of the mouth of the car installed on the cooling fan, to the kiln forced air supply will cause the flue gas discharged oxygen content is too high? In fact, this concern is not necessary, because the oxygen content in the flue gas is high and the exhaust fan is open too large a direct relationship, and positive pressure roasting due to the gas can be burned brick billet and the full contact, but more oxygen consumption, more conducive to reducing the oxygen content in the flue gas.
As fuel consumption is relatively low, emissions are low, less desulphuriser etc. is consumed and savings are made accordingly. Is not the kiln door or out of the mouth of the car installed on the cooling fan, to the kiln forced air supply will cause the flue gas discharged oxygen content is too high? In fact, this concern is not necessary, because the oxygen content in the flue gas is high and the exhaust fan is open too large a direct relationship, and positive pressure roasting due to the gas can be burned brick billet and the full contact, but more oxygen consumption, more conducive to reducing the oxygen content in the flue gas.
5. Prevent the loss caused by high temperature
The design of kiln door at the exit of the car, together with the cooling fan, can not only do a good job of forced air supply, but also effectively limit the air intake to the tunnel kiln, once the kiln temperature is too high, you can put down the kiln door, turn off the cooling fan, limiting the air intake to form a lack of oxygen in the kiln, to achieve the purpose of rapid temperature reduction.
The design of kiln door at the exit of the car, together with the cooling fan, can not only do a good job of forced air supply, but also effectively limit the air intake to the tunnel kiln, once the kiln temperature is too high, you can put down the kiln door, turn off the cooling fan, limiting the air intake to form a lack of oxygen in the kiln, to achieve the purpose of rapid temperature reduction.
Gas tunnel kiln energy-saving technology transformation
What should I do when my tunnel kiln needs an overhaul?
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