The stability of the thermal engineering system affacts rotary kiln US’s working life.
It is the comprehensive effect of the balanced and reasonable control of each process link, the first of which is the combustion process, only under the conditions that the coal powder quality, ventilation equipment, control instruments, and coal feeding measurement system can meet the process requirements Only by using a burner with excellent performance to obtain a reasonable flame shape can a stable thermal engineering system be established, which is conducive to the protection of the kiln skin. Because the temperature distribution in the kiln is reasonable, it can not only improve the metabolism process of the kiln skin, make the thickness of the kiln skin even and smooth, but also achieve the effect of reducing f-Ca0. Higher combustion efficiency can not only reduce the erosion of the alkaline brick by the reduction-oxidation atmosphere, but also reduce the secondary volatilization of alkali and sulfur, reduce the chemical erosion of the alkaline brick, and at the same time prevent the traditional rotary kiln from forming loop It is also important to prevent the clogs of the new dry kiln and the large eggs in the kiln.
KILN COATING OF ROTARY KILN
Since the kiln skin is a barrier, it is naturally also a slow layer of temperature fluctuations in the kiln. The fluctuation of the kiln temperature within a certain range has little effect on the brick surface through the kiln skin. The first is to slow down the heating rate of the hot surface of the brick, and the second is to greatly reduce the temperature of the brick surface when the kiln temperature reaches normal, reducing the expansion rate. At the same time, due to the protection of the kiln skin, the thermal fatigue of the brick surface will be significantly reduced. The presence of kiln skin can also reduce the ablation of alkaline bricks at high temperatures and the wear of refractory bricks at high temperatures. The surface temperature of the kiln body should not exceed 370 ° C. If this temperature is exceeded, the cooling measures should be taken as soon as possible.
BASIC BRICKS OF ROTARY KILN
- The first is to choose a good supplier to ensure the quality of alkaline bricks. We should also pay attention to the management of product packaging, reverse transportation, and storage process to prevent the bricks from getting wet in storage, being damaged by moisture and hydration, and reverse transportation.
- The second is to manage the construction of basic bricks, which has clear requirements in the “Regulations for the Use of Refractory Materials for Cement Rotary Kiln”. It is emphasized here that alkaline bricks can only be built after the rotary kiln itself has been repaired and tested, and no more kilns are allowed to be built until the bricks are ignited and heated up. Because the surface of the fire brick is not regular, the bricks must be loosened as soon as the kiln rotates the brick surface. If the kiln is rotated for a long time, the gap will increase, and the bricks above each ring will sink. (The processing operation is still more dangerous), and both the iron plate treatment and the brick treatment reduce the gap used for expansion compensation during the kiln, increase the expansion and extrusion stress of the hot surface of the fire brick during the kiln. Obviously affect the service life.
- The third is to formulate detailed rules for the use system based on the “Regulations for the Use of Refractory Materials for Cement Rotary Kilns” and the specific conditions of each kiln. For example, the time used for ignition and temperature rise and the heating rate of each section, the thickness of the new brick and the remaining brick are respectively For 150mm, 100mm, and 80mm bricks, due to the different pressing forces on the hot surface, there should be a difference: there are kiln skin and no kiln skin when the kiln skin is good or not, the heating rate should also be different. Ensure the safety of the heating process and save time as much as possible.