Introduction to Dry System of Metallurgy Rotary Kiln

The main reactions of the raw materials in the rotary kiln include the decomposition reaction, the exothermic reaction and the sintering reaction. Therefore, according to the space occupied by different chemical reactions in the kiln, the rotary kiln can be divided into the decomposition zone, the exothermic reaction zone and the firing zone.
In the decomposition reaction, when the temperature rises to above 900 ℃, the calcium carbonate will substantially decompose into the calcium oxide and carbon dioxide. In the exothermic reaction, after raw materials complete the decomposition, they advance along the rotary kiln. Since the kiln gas is heated up and the exothermic reaction occurs, the temperature of the materials rise sharply so that there is large temperature difference between the materials and the previous decomposition zone. Viewed from the kiln head, the boundary of the "shadow" can be observed. In addition, you can determine the rate of the decomposition of calcium carbonate in the rotary kiln to determine and predict the temperature of the kiln. In the firing reaction, when the materials proceed to the high temperature zone which is over 1300 ° C with the rotation of the rotary kiln, the mineral in the material dissolves into the liquid phase. According to the production experience, the general conditions to control firing reaction in the rotary kiln are the followings. The temperature should be between 1350 ℃ and 1450 ℃. The amount of liquid phase is generally controlled at 20% to 30%, and the reaction time is generally 10mins to 15mins.
In the new dry cement production process, the staffs usually centralized control and adjust the various process parameters of the rotary kiln system by monitoring computer in the central control room. The intelligent adjustment and monitoring can be achieved through the adjustment of the main parameters according to the process rule to meet the production requirements. The main control parameters of the system are the followings. The first is the amount of raw material into the kiln: The amount of raw material into the rotary kiln determines the production of cement kiln. The amount of raw material into the kiln generally is required to be stable at the capacity indicators of the cement rotary kiln. The second is the speed of the rotary kiln. The speed of the cement kiln has a direct impact on the transit time of the materials in the rotary kiln and it has an indirect impact on the   clinker production and firing quality of the rotary kiln. The third is the air volume of the cooler. The air volume of the cooler can rapidly cool the clinker to improve the performance of clinker to achieve the purpose of energy saving.
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Karen Wu Introduction to Dry System of Metallurgy Rotary Kiln

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