Twin shaft PFR lime kiln, the PFR lime kiln, tunnel kiln, types of kiln, Pfr kiln

The Twin-shaft PFR Lime Kiln, officially named Twin-shaft Parallel Flow Regenerative Lime Kiln, represents one of the most cutting-edge, energy-efficient, and widely adopted lime calcination technologies globally. It is specifically engineered for producing high-activity, top-grade lime, serving key industries such as metallurgy, chemical engineering, and building materials with consistent performance.

The kiln’s name directly reflects its core structural design and technological principle, which consists of three key components:
- Twin Shafts: Two identical vertical shafts are arranged in parallel, working in coordination to ensure continuous and stable operation throughout the calcination process.
- Parallel Flow: During the calcination phase in one shaft, high-temperature flames and combustion gases flow downward in the same direction as the limestone feed. This parallel flow mechanism is crucial to generating quicklime with exceptional reactivity, a key requirement for high-end industrial applications.
- Regenerative System: The two shafts operate alternately in two modes—calcination and heat storage. Waste heat from the flue gases of the shaft in calcination mode is fully recycled to preheat cold limestone in the other shaft, maximizing thermal energy recovery and utilization efficiency.

Key Advantages That Make HBMER’s Twin-shaft PFR Kiln a Industry Leader
The Twin-shaft PFR kiln has established itself as an industry benchmark, thanks to its outstanding advantages that address the core needs of modern industrial production:
- Outstanding Thermal Efficiency & Ultra-Low Energy Consumption: Leveraging its advanced twin-shaft regenerative technology, the kiln captures nearly all waste heat from flue gases for raw material preheating, reducing the final exhaust gas temperature to as low as 150°C. This translates to an impressive thermal efficiency of 85% – 92%, with a specific heat consumption of only 820 – 850 kcal per kg of lime— the lowest among all lime kiln types. Compared to traditional calcination processes, it achieves energy savings of more than 30%.
- Superior Lime Quality Guaranteed: The parallel flow calcination method ensures that high-temperature flames first come into contact with preheated limestone, effectively avoiding common issues in traditional kilns such as over-burning (surface vitrification) and under-burning (incomplete calcination). The resulting lime boasts high reactivity, stable chemical composition, and consistent quality, making it ideal for demanding scenarios like steelmaking.
- Exceptional Fuel Versatility: HBMER’s PFR kiln is designed to efficiently utilize a wide range of fuels, including natural gas, coke oven gas, blast furnace gas (with a calorific value above 800 kcal/Nm³), pulverized coal, heavy oil, and even mixed fuel combinations. This flexibility allows the kiln to adapt seamlessly to local energy resources, optimizing operational costs for clients.
- Significant Environmental Performance: High combustion and thermal efficiency minimize fuel consumption, thereby reducing emissions of pollutants such as NOₓ and dust. When paired with advanced dust collection systems (e.g., baghouses), the kiln easily meets stringent national and international environmental emission standards, supporting green industrial development.
- Intelligent Operation & High Stability: Equipped with state-of-the-art PLC/DCS automatic control systems, modern PFR kilns enable precise regulation of all critical operational parameters, including feeding, shaft reversing, and fuel-air ratio. The "one-touch" intelligent production function allows operators to set production targets, and the system automatically calculates and applies the optimal parameter combination within 0.5 seconds, ensuring stable, reliable, and low-maintenance operation.

Main Application Fields
Backed by these advantages, HBMER’s Twin-shaft PFR Lime Kiln plays an indispensable role in multiple key industries:
- Metallurgical Industry: Supplies high-reactivity lime as a fluxing agent for steelmaking, effectively improving desulfurization and dephosphorization efficiency, and enhancing molten steel purity.
- Chemical Industry: Provides high-quality raw materials for the production of calcium carbide, nano-calcium carbonate, soda ash, and other chemical products.
- Environmental Protection & Building Materials: Applied in flue gas desulfurization, wastewater treatment, soil improvement, and the production of high-grade lime-based building materials.

HBMER’s Advanced Twin-shaft PFR Lime Kiln
Based on the traditional twin-shaft kiln design, HBMER has upgraded its high-efficiency, energy-saving Twin-shaft PFR Lime Kiln to better meet the practical needs of the steel industry. The upgraded model features a rotating seal system, upper and lower charging hoppers, and a single-layer kiln shell structure—designs that enhance adaptability to local operational conditions and reduce overall costs. Retaining excellent fuel flexibility, it can accommodate various gaseous, solid, and liquid fuels. The alternating combustion and preheating design of the two shafts ensures highly efficient thermal energy utilization, with core advantages including high-reactivity lime production and low energy consumption (e.g., 125 kg of standard coal equivalent per ton of lime).

HBMER possesses comprehensive capabilities in supplying complete kiln systems and holds independent intellectual property rights for its high-efficiency, energy-saving Twin-shaft PFR Lime Kiln, demonstrating its strength in technological innovation and industrial application.