Analysis and Solution of Burning and Reversing Failure of Tunnel Kiln Car | Brick and Tile Technology
11-06
I. Burnt of tunnel kiln car
If the temperature at the lower part of the tunnel kiln car is too high, the lubrication of the kiln car bearing will not burn dry and burn. Heavy will deform the skirt plate and sand sealing plate, causing the kiln car to fail to operate normally and the maintenance workload will increase accordingly. This kind of accident generally occurs in the firing zone and the cooling zone. The main reason is that the upper pressure of the tunnel kiln car is too high (lower than the car), or the upper and lower seals of the kiln car are not tight.
The solution to this problem is to reduce the temperature under the car and cool it by blowing air under the car. Properly increase the pressure under the car to balance the upper and lower pressures of the kiln car; Do a good job in the sealing of the kiln car. Sand should be added quantitatively to the sand sealing groove to ensure the sealing effect. If the skirt plate of the kiln car has been deformed, it should be handled and leveled in time. Otherwise, the kiln car will burn damage will be more serious.
The phenomenon of the collapse of the blank body on the kiln car in the tunnel kiln is generally called "reversing", which is one of the common faults of the tunnel kiln. The main reasons for reversing are:
(1) The loading does not meet the requirements, or the blank stack is unstable, or the pad brick is loose, etc.
(2) The water content of the billet entering the tunnel kiln is too high, the temperature of the preheating zone kiln head is too high, or the temperature difference between the upper and lower parts of the preheating zone is too large, causing the billet to collapse. After the billet is broken, it may also be stuck in the gap between the kiln car and the kiln wall, causing the resistance to enter the car to increase, the material stack or pad brick to move, and eventually causing the billet stack to collapse.
(3) The firing temperature is too high or the holding time is long, and the product is over-burned and deformed, causing the product column to skew and collapse.
(4) The temperature distribution in the tunnel kiln is unreasonable, and the high-temperature strength of the scaffolding is low or the rapid cooling and heat resistance is poor, resulting in the fragmentation of the scaffolding.
(5) Collision with tunnel kiln wall or protrusion.
(6) derailment of kiln car or unbalanced running of kiln car.
Sometimes the above factors may also exist at the same time. After the reversing accident occurs, if it can be found early and handled in time, the loss can be reduced. Therefore, when entering the car intermittently, attention should be paid to observe the conditions on both sides of the tunnel kiln before entering the car, and the pressure change of the pusher during the propulsion process should be paid attention to when entering the car continuously.
The specific measures to deal with reversing accidents should be determined according to the specific situation. Such as a slight reverse or reverse occurred in the cooling zone, sometimes do not need to stop the kiln treatment, but with the car to push out. If reversing occurs in several parking spaces at the head of the preheating belt, the combustion chamber can be ceased, the kiln door can be opened, and the kiln cars can be pulled out one by one by using the pusher (oil pressure return or spiral return) or the carriage return machine, etc., until the accident kiln car is pulled out, and then continue to enter the car. If the accident occurs near the firing zone, the accident treatment holes before and after the firing zone should be used as much as possible. If the accident car of the tunnel kiln has passed through the accident treatment hole of the cooling belt and the reversing is serious, if continuing to enter the car will expand the reversing range, cease fire and stop the cooling belt blowing, open the cooling belt kiln door, and drag the kiln car out one by one from the rear until it can enter the car smoothly.
When dealing with the accident tunnel kiln furnace temperature drop, we should pay attention to the cooling speed is not too fast. Special attention should be paid to a large number of cold air into the kiln, resulting in damage to the kiln body and cracking of products loaded on the normal kiln car. In order to prevent reversing accidents, tunnel kilns must strictly ensure the loading quality. Before entering the kiln, they must be checked one by one to eliminate accidents outside the kiln as much as possible. Secondly, we should control the moisture in the kiln. And should be strictly firing operation, stable thermal system.
