Analyze the cause of the movement of the calcining belt of the active lime kiln

In the calcination production of active lime factory kilns, the position and temperature of the calcination zone are the key factors that affect the quality of the calcination of the material. In many cases, in the high-temperature calcination operation, due to the influence of various factors, the position of the active lime kiln calcination zone will move or become shorter, which has a great impact on the calcination operation. However, if you want to solve the problem fundamentally, you must find the cause and avoid it effectively to completely solve the problem. Today, the editor of Qianbaidu will combine some of our practical experience to give you details Let’s analyze the reason for the movement of the calcining belt of the active lime kiln, so that everyone can solve the problem fundamentally.

1. Moisture content of calcined materials.

When the active lime kiln is calcining lime materials, if the water contained in the active lime materials is too large, after entering from the kiln end, a large amount of heat is required to preheat it. In this case, the temperature at the end of the active lime kiln will inevitably drop, resulting in an increase in the length of the preheating zone, and eventually the position of the active lime kiln calcination zone will move forward or become shorter.

2. The material size is too small.

Active lime

If the particle size of the material calcined in the active lime kiln is too small, the surface roughness will decrease. In this way, when the material moves in the kiln, as the ascending height decreases, the moving speed will increase, which will cause the position of the active lime kiln calcination zone to move forward or shorten.

The purpose of adding lime to steelmaking is desulfurization, dephosphorization, and desiliconization. The calcium oxide in lime cannot participate in the above-mentioned effects in a solid state. Small particles of active lime have large porosity and large specific surface area, and the diffusion rate of steel slag to lime is fast, especially when the converter smelting time is short, calcium oxide must be highly active to be able to slag in a short time. Active lime has the characteristics of fine grains, high porosity, low volume density, specific surface area, etc. It is used for steelmaking and slagging quickly, short smelting time, and good desulfurization and dephosphorization effects. Because the common feature of steelmaking desulfurization and dephosphorization is high alkalinity, and the active lime itself has low sulfur and phosphorus content. Therefore, it has a good desulfurization and phosphorus effect during smelting. The early dephosphorization rate can reach more than 90%, which is 15% higher than ordinary lime dephosphorization; at the same time, it can reduce the amount of lime added; it can reduce the amount of steel slag generated, thereby increasing the yield of molten steel; it reduces the heat loss in the furnace and increases the scrap ratio. The smelting output has been increased; splashing has been reduced, and the blow loss rate has been reduced (1%-3%); the molten steel has been purified and the quality of molten steel has been improved; the corrosion of the furnace lining has been reduced, the furnace age has been improved, and the maintenance cost of the furnace lining has been reduced.

Maerz lime kiln has two characteristics: parallel flow and heat storage recovery. The parallel flow enables the hot flame of the calcination to contact the raw material and cold air to complete the combustion, the raw material stone will not be overfired, the heat exchange rate is high, and the calcination process can achieve a neat and uniform soft firing condition.

The heat storage recovery enables the preheated stone to absorb the heat of the exhaust gas and release it to the incoming gas, so that it will be heated to the burning temperature before it comes into contact with the fuel active lime price, so that the kiln can obtain a very high thermal efficiency.