What are the effects of ball formation in the rotary furnace

What are the effects of balling in the rotary furnace? This can lead to a significant reduction in the cross-sectional area of the kiln, seriously affecting the ventilation inside the kiln and hindering material movement. It has some effects on the output, quality, coal consumption, and electricity consumption of the rotary furnace. What are the negative factors that cause this phenomenon?

1. Fluctuation in raw material composition

When balling in the rotary furnace, the repeated shutdown of the raw material preparation system causes the dust collected at the kiln end to be homogenized before entering the raw material The frequent conversion between the two directions of storage and direct kiln entry can cause fluctuations in the chemical composition of the raw material, disrupt the balance of the internal thermal system, and provide conditions for the formation of nodules within the system

2. Unstable and incomplete combustion of coal powder

When the ash content of the original coal-fired coal exceeds the control index (22% ± 2%), it will cause high ash content and large fluctuations.

. Incomplete combustion of coal powder, uneven mixing of coal ash into the flame for too long, causing the flame to move backwards, resulting in local high temperatures at the kiln end, causing premature liquid phase formation of the materials at the kiln end, resulting in agglomeration

3. Enrichment Cycle of Harmful Components

When harmful components such as alkali, chlorine, and sulfur are enriched and circulated in the system, they will reduce the co melting temperature of the material and form cohesive substances, providing conditions for the formation of spherical nuclei, which become larger and larger as they roll forward.

4. Unstable feeding

Unstable feeding rate can cause disorder in the system processing system, that is, when the feeding rate fluctuates from high to low, the temperature at the kiln tail will increase, and the liquid phase of the material will appear earlier under high-temperature calcination conditions.

; When the feeding rate fluctuates in the opposite direction, the material fails to achieve good preheating and decomposition in the decomposition furnace, and these materials fall into the kiln tail, providing a good nucleating agent for the ball core

5. Low equipment operation rate, frequent startup and shutdown

Low equipment operation rate, frequent startup and shutdown can cause disorder in the system thermal system, unreasonable matching of air, coal, material, and kiln speed, and frequent collapse of the preheater and decomposition furnace, leading to agglomeration.

6. Poor ventilation inside the electric rotary kiln

Poor ventilation inside the kiln will exacerbate the incomplete combustion of coal powder, generate local high temperatures, and directly lead to agglomeration in the rotary kiln.

. In addition, it will create a reducing atmosphere inside the kiln, and when the volatilization coefficients of potassium, sodium, chlorine, and sulfur in the materials increase, it will have a significant impact on scaling and pelletizing

The rotary furnace that frequently forms circles not only damages the normal thermal system inside the kiln, but also damages the physical health of operators, causing economic losses to production. So after understanding the reasons, corresponding measures should be taken. In daily operations, when encountering problems in this area, it is necessary to promptly solve them and try to avoid them as much as possible