Pusher Tunnel Furnaces from Harper International Corporation

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Harper's pusher plate and tunnel kilns are designed for processes requiring precise control of temperature and atmosphere, ideal for those with longer residence times that require exact control of the heat up rate of the product (temperature profile) and lower gas/solid reaction. Our focus is on systems that offer the greatest operating life, lowest operating cost, and highest efficiency for the manufacturing of advanced materials.

Our innovative design enhancements consider the delicate pressure control within the system to provide accurate direction of the atmosphere flow path in the kiln. This facilitates evacuation of volatiles and optimizes atmosphere uniformity. Additionally, Harper's unique gas curtain technology provides zone-to-zone atmosphere definition under specific conditions. Our distinctive stripping chamber design provides optimal isolation of internal tunnel chamber environment from ambient as well as efficient purging of ambient atmosphere entrained within the load entering the furnace without the use of mechanical doors and seals.

Harper approaches the design of a conveyor furnace as a complete system, with the ability to incorporate advanced control systems, skid mounting, gas treatment and handling, turnkey installation and complete field commissioning. Field service can incorporate control instrumentation integration and programming as well as process engineering optimization and support.

Harper Pusher Furnace Capabilities

Temperatures to 2800°C
Electrically heated or gas-, oil- or dual-fuel fired
Controlled atmospheres including flammables gases, as well as multiple atmospheres
Process gas circulating and conditioning systems
Defined residence times and capacity
Automatic material handling and return systems
Advanced seal design
Automatic feed loading and product unloading

Typical Pusher Furnace Applications