Comparison of lime production between rotary kiln and shaft kiln
In the process of lime production, the selection of kiln type is very important, which directly affects the production cost, product quality, energy consumption and environmental impact. Among many kiln types, rotary kiln and shaft kiln are the two most common choices. Compare the two kiln types in detail, in order to provide valuable reference for lime production enterprises.
Rotary kiln has become the first choice for large-scale lime production enterprises because of its large production capacity and uniform and stable calcination quality. The rotary kiln has a long kiln body, which can continuously and stably output high-quality lime products. It has strong adaptability to raw materials and can calcine various refractory raw materials, including those that are difficult to sinter and easy to agglomerate. In addition, the rotary kiln has a high degree of automation, which can realize the automatic control of raw material transportation, feeding, distribution, ash discharge, dust removal and other links, and reduce the influence of human factors. However, the construction investment of rotary kiln is relatively large, and the problems of heat loss and dust removal also need special attention.
In contrast, the shaft kiln is favored in some mountainous and hilly areas because of its economic, practical and simple operation. With simple structure and less investment, the shaft kiln is an economic choice for enterprises with limited capital. It is relatively simple to operate and has strong adaptability to raw materials, which can meet the requirements of firing a variety of limestone raw materials. In addition, the energy consumption per unit product of the shaft kiln is relatively low, the heating speed is fast, and the firing efficiency is high. However, the shaft kiln also has some shortcomings, such as large floor space, unstable product quality and low degree of automation. Because the distribution of materials in the shaft kiln is not easy to be uniform, and the temperature fluctuation is large, it is easy to lead to unstable product quality and produce under burnt and over burnt products.
In terms of energy utilization, although the shaft kiln can use low calorific value fuel to reduce production costs, the rotary kiln has more stringent requirements for fuel, and must use high calorific value gas, oil or pulverized coal. This affects the selection of two kiln types to a certain extent.
From the perspective of environmental protection, the rotary kiln adopts advanced dust removal and desulfurization technology, which can effectively reduce waste gas emissions and meet the national environmental protection requirements. The shaft kiln may produce dust pollution in the discharge process, so effective environmental protection measures need to be taken.
