How to adjust the deviation of environmental protection lime kiln?

Because of energy conservation and emission reduction, environment-friendly lime kilns are in line with the green production policy strongly advocated by the state. When using environment-friendly lime kilns, the problem of partial fire often occurs, which is related to the later production process. The air volume and fire power are not controlled properly, resulting in uneven combustion. The following sections will explain how to adjust the partial fire of environment-friendly lime kilns.

1、 Reasons for deviation of environmental protection lime kiln

1. Excessive air volume

Energy saving and environmental protection rotary kiln

It is caused by the premature combustion of anthracite due to the small size of anthracite particles. This can also happen if the discharge amount is too small (i.e., the output is low) or the air volume is too large. This phenomenon is accompanied by the increase of kiln gas temperature, the decrease of lime temperature, the increase of calcination amount and the increase of the degree of incandescence of the material surface.

2. The raw material grain is too large

Because the anthracite particles loaded are too large and the discharge amount is too much (the output is too high), the calcination speed cannot keep up; Or the air pressure is small, the air supply resistance is large, the air volume is insufficient and the adjustment is not timely. It is characterized by the rise of discharge temperature, unburned anthracite coal or red fire in the discharged lime, and the reduction of CO2 concentration in the kiln gas.

3. Stacking of raw material fragments

The temperature of discharged lime and kiln gas rises, the limestone particles are too small, and the content of crushed stone is high; The content of anthracite is high; Tumor blocks are formed beside the kiln wall, which block ventilation in one place and reduce the calcination area, but in other places, there is more ventilation and improve the calcination area.

4. Low coal blending rate

The calcination area is shortened due to low coal blending rate. This phenomenon is accompanied by an increase in the amount of lime calcined, a decrease in the concentration of CO2 in the kiln gas and its temperature.

5. Unilateral calcination

It is usually caused by uneven distribution, coal distribution and discharging, uneven ventilation, or a lump on the kiln wall. Along with this phenomenon, the material level is inclined, forming a high side and a low side. The feeding is uneven on all sides, and the temperature is uneven. The fire in the kiln runs out on one side.

6. Nodule

It includes lump formation, ring formation and wall hanging lump formation in the kiln, which are mainly caused by excessive coal blending rate, concentrated coal quantity, local high temperature and the melting aid of coal ash; Limestone itself has high clay content (it is strictly prohibited to bring soil and other things into the kiln during loading); Inattention in operation, too long discharging interval, and failure to perform on duty feeding; The side wind is strong, the fire is fast, and the ventilation in the center is poor.

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