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The following is an introduction to the flat-roofed circular kiln for brick firing :

Overview of the flat-roofed circular kiln for brick firing

The flat-roofed circular kiln for brick firing is a traditional brick-firing kiln. It is circular or ring-shaped and consists of multiple interconnected kiln chambers with a flat roof. Its working principle is that each kiln chamber takes turns to carry out operations such as loading bricks, firing, cooling, and unloading in sequence. The flow of flames in the kiln chambers is utilized to fire bricks and tiles.

The role of the coal inlet holes on the flat roof

Adding fuel : They are the channels for adding fuels such as coal into the kiln, enabling the fuel to directly enter the kiln chambers for combustion and providing heat for brick firing.

Adjusting temperature : By adjusting the amount and frequency of fuel added through different holes, the temperature at different positions inside the kiln can be adjusted to ensure a relatively uniform temperature in the kiln and better firing results for the brick blanks.

Observing the fire condition : Operators can observe the condition of the flames inside the kiln through these holes, such as the color and brightness, so as to judge the temperature and combustion status inside the kiln and facilitate timely adjustments.

Technologies related to adding coal

Judging the timing of adding coal : It is mainly judged by observing the color of the flames and the state of the brick blanks in the kiln. Generally, when the flames are bright yellow and relatively stable, the temperature is appropriate. If the flames are red and the brightness is dim, it may be necessary to add coal. The color change of the brick blanks can also be observed. If the color of some brick blanks is relatively light and does not meet the firing requirements, coal also needs to be added.

Controlling the amount of coal added : It is determined according to the size of the kiln chamber, the number of brick blanks, and the current temperature situation. The newly added coal should be in an appropriate amount to avoid adding too much coal, which may lead to overheating and burning of the brick blanks, or adding too little coal, resulting in insufficient temperature. The general principle is to add a small amount of coal multiple times to make the temperature in the kiln rise steadily.

Selecting the position for adding coal : Appropriate more coal can be added through the holes in the areas with relatively low temperature according to the temperature distribution inside the kiln to ensure a uniform overall temperature.

Interval between adding coal

Usually, coal is added once every two and a half hours or so. However, in practice, it will be affected by various factors, such as seasons, coal quality, and the number of brick blanks in the kiln. In summer, when the temperature is high and heat dissipation is slow, the interval between adding coal can be slightly longer. In winter, it needs to be appropriately shortened. When the coal quality is good and the calorific value is high, the interval between adding coal can also be extended !