Rotary Tube Furnaces
designed by Harper offer exceptional versatility, reliability and energy efficiency and include multiple patented features that enable better mixing, resulting in improved heat transfer and mass transfer for graphene and carbon materials.
Many applications require performance and safety that is only achieved by maintaining ultra-high purity. Harper’s Rotary systems consider these high purity applications from beginning to end: material in-feed valves and feeder, high-heat reactor tube, product cooling tube, and material discharge valves and collection. We have the experience to engineer these components to achieve a chemically inert environment all while maintaining a gas-tight and dust-tight system for your advanced material.
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Harper's patented Vertical Conveyor furnace
offers advanced thermal processing with reactions that are distributed more uniformly and quickly over the surface layer of material to precisely heat graphene and carbon materials.
One of many advanced design features, our system’s specialized material movement limits the potential for overheating problems, such as melting/sublimation, sintering or excessive grain growth. In addition to the container-less nature of the design, thermal transfer between product and reactants significantly improves the power efficiency of the unit. Our Vertical system limits heating and cooling requirements to the process material only – containment remains at temperature and the process material moves through it - resulting in better heat and mass exchange between products and reactants for improved efficiency.
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Harper's Pusher Tunnel Furnace systems
offer exceptional operating life, low operating cost and high efficiency ideal for the manufacturing of advanced carbon materials and graphene.
As many thermal processes for energy device materials require exacting conditions, 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.
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Harper’s Fluid Bed
reactor systems offer the advantage of ease of operation, excellent conditions of heat and mass transfer within the bed, uniform particle mixing and uniform temperature gradients. The ability to operate at a continuous state allows manufacturers to produce their carbon and graphene materials more efficiently due to the removal of startup conditions in batch processes.
Our Fluid Bed reactors are uniquely manufactured to meet the specific requirements of each customer, with focus on providing the most effective chemical reactions and heat transfer. Harper systems are designed to send a powerful stream of fluid (gas or liquid) up through your particulate material, suspending and circulating the gas and solid particles. This fluidization produces an even distribution of air among the particles, making the fluid bed perfect for heat transfer and diffusion reactions. Our experts will consider the temperature uniformity, fluidization gas velocity, reaction kinetics, gas/reactant concentrations, and the effects of bed height and diameter to create the exact design for your needs.
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