How to adjust the high proportion of over burnt lime from lime kilns
The high proportion of raw and over burned materials in the lime kiln lime is a typical manifestation of process imbalance, which directly affects product quality and economic benefits. This problem is usually caused by unstable thermal systems or improper material retention time, and can be resolved through systematic adjustments.
1、 Accurate control of calcination temperature
The coexistence of raw firing and over firing lies in the core contradiction of uneven or significant fluctuations in the temperature field inside the kiln.
Temperature calibration: Firstly, verify the accuracy of temperature measuring instruments such as thermocouples to ensure that their feedback on the center temperature is true and reliable.
Optimize the ratio: Strictly adjust the ratio of fuel to air volume. There are many raw materials, so it is necessary to increase the temperature of the calcination zone appropriately; If there is too much burnt material, it means that the local temperature is too high. It is necessary to seek a stable and uniform temperature range through adjustment. Ensure that the fuel is fully burned to avoid the coexistence of local low and high temperature zones due to incomplete combustion.
2、 Stable materials and airflow
The preheating, calcination, and cooling time of materials must be stable.
Uniform distribution: Ensure uniform particle size of limestone entering the kiln (preferably graded), and use a reasonable distributor to make the material surface flat and ensure consistent ventilation resistance inside the kiln.
Control rate: Adjust the frequency and quantity of feeding and discharging to maintain a stable material sinking speed. If the speed is too fast, it is prone to overheating; if it is too slow, it is prone to overheating. Find the propulsion speed that matches the current temperature to obtain the appropriate calcination time for the material.
3、 Manage the working conditions inside the kiln
The state of the kiln body itself is the foundation.
Eliminating nodules: Kiln wall nodules can alter the material flow path and airflow distribution, leading to biased flow and localized overheating and overburning, while other areas are also burnt. It is necessary to handle the nodules according to the regulations and restore the regular cross-section inside the kiln.
Maintain kiln lining: Ensure the integrity of the kiln lining, reduce heat loss, and create necessary conditions for the formation of a uniform and stable calcination zone.
To solve the problem of high proportion of raw and burnt materials, a systematic approach of "temperature as the core, materials as the foundation, and kiln conditions as the guarantee" must be adopted. By refining operations, stabilizing thermal systems, and balancing logistics, we can effectively improve the yield of genuine products and achieve high-quality and high-yield production.
