Reasons for the Formation of Circle Formation in Rotary Kiln Burners
The adjustment and use of rotary kiln burners. The main fuel used in the cement production process is coal as the rotary kiln burner, and the coal injection pipe plays a key role in the clinker calcination process. The quality of cement clinker, the output of the kiln, the service life of refractory materials, and
Formation of Circle in Front of Rotary Kiln Burner
The front ring (also known as the kiln mouth ring) is a ring formed at the end of the firing zone in a rotary kiln. Under normal calcination conditions, the material temperature is between 1350 and 1450 ℃, and the liquid content is about 24%, indicating a high viscosity. When the clinker leaves the sintering zone, the liquid phase begins to cool, and the liquid phase entering the cooling zone has basically solidified. There is a significant temperature difference at the junction of the firing zone and the cooling zone, and the temperature of the kiln inlet material is higher than the temperature of the kiln skin. When the clinker enters the cooling zone, the high-temperature clinker with a liquid phase is covered on the lower end kiln skin, which will quickly bond and become thicker, forming a front ring. During the calcination process, when the high temperature part of the calcination zone is too concentrated, there is a large temperature difference at the junction of the cooling zone and the calcination zone. In addition, the amount of liquid phase in the high-temperature rapid calcination increases, resulting in a smaller viscosity. When the clinker enters the cooling zone, a large amount of liquid phase still rapidly cools near the junction, promoting the growth of the front ring.
Formation of clinker ring in rotary kiln burner
The clinker ring (also known as the second ring) is a ring formed between the firing zone and the exothermic reaction zone in the kiln, and is also a highly hazardous ring formed in the rotary kiln. During the calcination process of clinker, when the material temperature reaches 1280 ℃, its liquid viscosity is relatively high, and the clinker ring is easy to form. After cooling, it is relatively sturdy and difficult to remove. Under normal calcination conditions, the inner diameter of the clinker ring is often melted and dropped, maintaining the normal inner diameter of the ring. If there is too much liquid phase in the temperature range of 1250-1280 ℃, it often forms a clinker ring that hinders production. The clinker circle is generally formed at the boundary of the firing zone or further away. Initially, the kiln skin behind the firing zone gradually grows and thickens, and develops to a certain extent to form the clinker circle. The length of the kiln skin in severe clinker circles may even be several times longer than the normal kiln skin length.