What are the advantages and disadvantages of rotary kiln lime kiln
As the mainstream equipment in the field of lime production, rotary kiln lime kiln plays a key role in industrial production with its unique advantages and inherent defects.
Significant advantages:
Strong production capacity: The structure of the rotary kiln allows for continuous production, with a daily output of over 1200 tons per kiln and an annual output easily exceeding 100000 tons, meeting the scaling needs of large metallurgical and chemical enterprises.
Stable calcination quality: The material is uniformly heated during the rolling process in the kiln, and the temperature field and airflow distribution are precisely controllable. The lime activity generally reaches over 360ml, and the residual CO ₂ content can be controlled below 2%. The product quality far exceeds the industry average level.
Strong adaptability of raw materials: It can calcine crushed ore with a particle size of 5mm or more, and the utilization rate of raw materials is increased by more than 20% compared to traditional kiln types. It is particularly suitable for processing low-grade resources such as metallurgical waste and limestone tailings.
High level of automation: an intelligent control system integrating raw material conveying, fabric distribution, ash discharge, dust removal, and other processes reduces the number of operators by 60% compared to vertical kilns, significantly reducing labor intensity.
Coexistence of defects:
The construction cost is high: the length of the kiln body generally reaches 50-70 meters, the equipment weight exceeds 1000 tons, and the supporting auxiliary devices such as preheaters and coolers make the total investment 50% -80% higher than that of the vertical kiln.
Energy consumption control challenge: Insufficient sealing performance of the kiln body leads to an air leakage coefficient of 10% -15%, lower thermal efficiency than the new vertical kiln by 15% -20%, and higher fuel consumption per unit product by more than 20%.
Dust control pressure: The dust content in the kiln exhaust gas reaches 3000-5000mg/m ³, requiring large-scale dust removal equipment. The energy consumption of the dust removal system accounts for 15% -20% of the total energy consumption of the production line.
High maintenance costs: Rotating components require major repairs every 3-5 years, refractory materials are replaced every 2 years, and annual maintenance costs account for 8% -10% of the original equipment value.
