Selection Guide for Environmental Protection Lime Kiln Equipment
As the core equipment for lime production, the selection of environmentally friendly lime kilns should take into account process adaptability, environmental compliance rate, and operational economy. The mainstream equipment in the current market includes vertical kilns, rotary kilns, and double chamber kilns. Different kiln types have differences in energy consumption, emissions, and investment costs. Enterprises need to comprehensively consider the characteristics of raw materials, production capacity requirements, and environmental policies.
The adaptability of raw materials is the basis for selection. If high-grade limestone (with a calcium oxide content of ≥ 90%) is used, vertical kilns are suitable for small and medium-sized production due to their simple structure and high thermal efficiency; When low-grade raw materials or active lime need to be calcined, the continuous calcination characteristics of the rotary kiln can improve product uniformity. The kiln length is usually between 60-120 meters, and the calcination temperature and time can be flexibly adjusted.
Environmental performance is a key indicator. The double chamber kiln adopts parallel flow heat storage technology, with a thermal efficiency of over 85%, which is 30% more energy-efficient than traditional vertical kilns. After being equipped with a bag filter, the particle emission concentration can be controlled within 20mg/m ³, which meets the ultra-low emission requirements of most regions. If the enterprise is located in a key environmental protection area, it can prioritize the use of such equipment and install denitrification devices to control nitrogen oxide emissions.
Investment and operating costs need to be balanced. The single line production capacity of the rotary kiln can reach 300000 tons per year, but the equipment investment is relatively high, making it suitable for large enterprises; The single line production capacity of vertical kilns is mostly between 50000 and 150000 tons per year, with lower initial investment but higher labor and fuel costs. Enterprises should calculate the comprehensive cost per ton of lime based on a 3-5 year operating cycle and choose the most cost-effective solution. This guide for selecting environmentally friendly lime kiln equipment provides practical reference for enterprise decision-making.
