Structure of High Temperature Shuttle Kiln

Structure of High Temperature Shuttle Kiln
The structure and working system of a high-temperature shuttle kiln will directly affect the firing quality and energy consumption of products. Reasonable selection of smoke exhaust methods is an important way to reduce the temperature difference in the kiln. What are the common smoke exhaust methods and their respective characteristics?
1. Kiln tail smoke exhaust method
The kiln tail smoke exhaust method has a simple structure and is convenient for construction and installation. However, due to the fact that flue gas is discharged from one end of the kiln body, it is easy to cause uneven internal pressure in the kiln. The suction force near the exhaust port at the kiln tail is large, while the suction force near the kiln door is small. It is troublesome to adjust the size of the fire suction hole on the kiln car table surface to evenly exhaust smoke from the kiln. Therefore, this smoke exhaust method is suitable for small volume or short and wide shuttle kilns, but not for large volume and long body shuttle kilns.
2. Smoke exhaust method at the bottom of kiln car
The bottom smoke exhaust method of the kiln car makes the kiln body structure simple and the kiln car structure simple. For high-temperature shuttle kilns, due to the high exhaust temperature, the underground flue can reduce the flue gas temperature, and then mix some cold air. The exhaust fan and heat exchanger operate at a suitable operating temperature. However, the setting of underground flue not only requires groundwater level, but also increases smoke exhaust resistance. At the initial stage of ignition, due to the low flue gas temperature, especially in winter in northern regions, the chimney suction force is very small or even non-existent, so the operation is relatively troublesome. Therefore, shuttle kilns using the bottom smoke exhaust method of kiln cars should be equipped with fan smoke exhaust devices as much as possible.
3. Smoke exhaust method at the top of the kiln
The structure of the kiln head smoke exhaust method is also simple, and the smoke exhaust resistance is small, so it is not necessary to exhaust smoke from the fan, just install a metal chimney at the kiln head to lead the smoke to the outdoor. The disadvantage is that there are smoke exhaust openings at the kiln head, which brings certain difficulties to the construction and installation of the kiln body. For high-temperature shuttle kilns with a dome structure, it is not advisable to set smoke exhaust openings on the kiln roof; If improperly controlled, it is easy to cause a temperature difference between the upper and lower parts; The top exhaust port is dirty and contaminates the glazed product; Due to the high exhaust temperature and high material requirements for metal chimneys, the kiln head exhaust method is more suitable for low-temperature shuttle kilns with a full fiber flat roof structure, rather than for arch roof structures and high-temperature shuttle kilns.
4. Smoke exhaust method of kiln side wall
Compared with previous smoke exhaust methods, the kiln sidewall smoke exhaust method has obvious advantages. Due to the installation of plug plates in the side wall flue, the pressure inside the kiln and the longitudinal pressure can be adjusted, and the pressure inside the kiln is uniform, without temperature dead angles, and with small temperature difference; Vertical chimneys are used for natural smoke extraction without the need for smoke extraction fans and long pipes, reducing energy consumption and investment in smoke extraction systems. The disadvantage is that the thickness of the kiln wall increases, which is not conducive to the lightweight of the kiln body.