Firing system HK series

Overview
Delivering high thermal efficiency, consistent product homogeneity and reduced operating costs, the HK series high-temperature shaft kilns are engineered for single-step sintering and calcining of refractory feedstocks at temperatures up to 2300°C. These vertical shaft kilns support multiple fuel types and can be supplied as new units or as retrofits for existing installations.

Key benefits

• Optimised operating costs: Reuses hot product-cooling air as secondary combustion air to minimise heat loss and improve thermal efficiency; supports liquid, gaseous and solid fuels to match local fuel availability.
• Product quality and homogeneity: Radially arranged burner lances penetrate the material bed to ensure uniform temperature distribution; configurable lance count and levels; variable-speed discharge enables precise control of retention time.
• Low-maintenance design: Segmented top plate and improved discharge mechanism reduce thermal stress and autogenous wear; top plate cast in high-temperature wear-resistant alloy and retrofittable to existing kilns.
• Safe start-up and operation: Natural gas or hydrogen start-up burners available for safe commissioning and recommissioning; advanced top-plate design reduces thermal load and operational risks at high temperatures.

Applications and capacities
The HK series is suited to single-step sintering and calcining processes including conversion of CCM to DBM, sintering of dolomitic lime, calcining of limestone and treatment of kaolin, bauxite and related refractory raw materials. Units are available up to 3.6 m outside diameter with handling capacities up to approximately 300 tpd, depending on application.

Models — examples
Representative model designations include HK10, HK16 and HK18. Example values published on the product page (illustrative):
Model: HK10 | HK16
Outer diameter (mm): 2200 | 3000
Shaft height (mm): 9500 | 10000
Number of burner lances: 12 | 16

Operation & technology highlights

• Radial burner lance arrangement with configurable lance count and levels for tailored thermal profiles.
• Variable-speed discharge for accurate retention time control and improved product homogeneity.
• Multi-fuel capability and use of recovered heat as combustion air to maximise process efficiency.
• Retrofittable improvements (segmented top plate, discharge mechanism) to reduce wear and enhance thermal performance on existing installations.

FAQs (selected)

• Maximum temperature: up to 2300°C.
• Why efficient: heated cooling air is reused as secondary combustion air, minimising heat loss and enabling high-temperature operation with limited oxygen.
• Materials processed: magnesite/magnesia, dolomite/dolime, limestone, kaolin, bauxite, calcined magnesia, alumina, spinel and related refractory feedstocks.
• Other names: sometimes described as regenerative calcining equipment (RCE) or RCE high-temperature shaft kilns.

Technical specifications

• Max. process temperature: up to 2300°C
• Maximum outside diameter: up to 3.6 m
• Example handling capacity: up to ~300 tpd (application dependent)
• Example model variants: HK10, HK16, HK18
• Example outer diameters: HK10 = 2200 mm, HK16 = 3000 mm
• Example shaft heights: HK10 = 9500 mm, HK16 = 10000 mm
• Example number of burner lances: HK10 = 12, HK16 = 16
• Fuel types: liquid, gaseous, solid
• Design features: radial burner lances, variable-speed discharge, segmented top plate (retrofit available), high-temperature wear-resistant alloy components