How Can Adjust the Kiln Head Burner of Rotary Kiln?

11/5/2013 11:34:51 PM

The kiln head burner is an important part of rotary kiln, and the purpose of adjusting the burner is to change the burning speed as well as changing the shape of the flame, and the relationship of the two purposes is close. The methods of adjusting the kiln head burner are listed in the following:

(1) Adjust the total quantity and pressure of the primary air and make sure that the coal-injection duct has sufficient thrust. The thrust of the coal-injection duct refers to the product of the primary blast capacity and primary air speed.

The primary blast capacity can be represented by the air quantity blown into the kiln every second, or the percentage of the primary blast capacity in the total air inside the kiln, and this value cannot be too big. For this reason, to improve the thrust the coal-injection duct can only be realized by improving the primary air speed, which requires that the draught fan has a certain pressure, and at the same time, the caliber of the coal-injection dust should be limited. Compared with traditional rotary kiln whose coal-injection duct has big caliber, low air speed at the discharging mouth and big primary blast capacity, this is one of the advantages of predecomposition kiln to improve the calcining state.

The coal-injection duct with reasonable thrust can not only reasonably control the flame, extend the running cycle of the kiln lining and improve the quality of the clinker, but reduce the primary blast capacity, which greatly reduces the heat consumption. According to the empirical date, the primary blast capacity decreases every 1%, the heat consumption of the clinker can be reduced by 84kJ/kg.

(2) Adjusting the inner diameter of the coal-injection duct and changing the air speed of the exit is the supplement measure to change the thrust of the coal-injection duct.

(3) Adjust the proportion of the internal and external air. The internal air is rotational flow air which can make the flame shorter and thicker; the external air is axial flow air which can make the flame thinner and longer. Generally speaking, when the coal-injection duct goes deep of the kiln, the internal air should be increased; and when the coal-injection duct is pulled out of the kiln, external air should be increased. However, this is not the fixed rule, it should be analyzed according to the specific condition.