Active lime calcination process is defined, the limestone is heated, decomposition, calcination process into active lime. Limestone in the rotary kiln system, a certain temperature and a certain time, after calcination decomposition of carbon dioxide separation (CO2), to give lime (CaO) product. After the calcination of limestone lime generation process is a process of chemical reaction. This process is mainly through the reaction temperature and the calcination time to complete. Wherein the calcination time is the amount of raw materials, feed rate and residence time of the decision. The calcination temperature is generated by the heat and mass transfer decisions. In between, the calcining temperature is more important. Understanding of the so-called Jaw Crusher temperature is actually generated by the fuel combustion to heat the material during sintering of the comprehensive embodiment of the heat transfer. Wherein the combustion temperature is the end of combustion of fuel discharged flue gas temperature, which is the heat released by burning fuel. The calcination temperature means: The calcined material in the process of changing the physical and chemical properties to achieve the desired temperature. Limestone to lime process of change, throughout the process at a temperature controlled chemical change. According to the characteristics of limestone chemical reaction process requires heating and firing device, the temperature distribution range and have different requirements. Different baking products at different calcination apparatus, the calcination according to the needs of its nature, the calcination time will make a different division of the basic range. This operation is commonly referred to in terms of the various stages of calcining or so-called "band." When using the lime kiln for firing activity, from a theoretical concept to understand, limestone in different containers, usually go through the warm-up, decomposition, sintering and cooling four stages. Calcination process but, in the rotary kiln with preheater, since due to the characteristics of the preheater, lime products typically have practical significance but is divided into preheating, firing and cooling stages. When the limestone into the vertical preheater, at the beginning and gradually move down under the action of the pusher means (plunger), and the effect of hot gas penetrating the material layer, from the start of the drying, preheating and surface decomposition reactions. In the vertical preheater, its decomposition rate can reach 25%. After preheating and start generating the surface decomposition reaction of limestone into a rotary kiln, in the radiation area moves to the flame or flame front in the decomposition reaction of limestone have been turned inside the particles from the particle surface. That is, the reaction of limestone occurs preheater kiln bottom and rear, in fact, the so-called limestone decomposition stage. However, in the rotary kiln with preheater, this stage is clear and there is no obvious explanation of the division. Therefore, in the rotary kiln with preheater, the division of the calcined lime reaction stage, is formed a preheating, firing and cooling of the three phases (band) divided concept. Please indicate Henan YuFeng Heavy Machinery