On the path of pursuing efficient and low-carbon production of carbon fiber, every step forward is of great significance. Today, we are pleased to share with you that the hot air microwave multi physics field coupling pre oxidation technology independently developed by the Jinggong Technology Carbon Fiber Research Institute team has achieved complete success in recent pilot tests!

Innovation breakthrough: The first multi field coupled pre oxidation pilot furnace has been successfully developed

For a long time, the pre oxygenation process has become a key bottleneck restricting the quality and efficiency improvement of the carbon fiber industry due to its highest energy consumption and longest cycle in the production of PAN based carbon fibers.

Today, we are breaking through the deadlock with continuous innovation - using the hot air microwave multi physics field coupling technology as a breakthrough point, successfully designing and building the first 0.4m wide hot air microwave multi physics field coupling pre oxidation pilot furnace in China. Through the coordinated control of the thermal field and microwave electric field inside the furnace, we have achieved significant acceleration and consumption reduction in the pre oxidation process.

The pilot furnace adopts an end-to-end airflow circulation design and innovatively introduces a special structure for microwave energy feeding and cavity layout, which enables the furnace to maintain a uniform distribution of microwave field in the width direction even when undergoing thermal expansion deformation, while ensuring high consistency between temperature field and wind speed field, providing a solid foundation for continuous and stable oxidation of fibers.

Simulation diagram of electric field in 0.4m microwave pre oxygenation furnace

Experimental results show significant energy-saving and acceleration, with clear potential for large-scale application

The pilot test results confirm that the strengthening effect of the pre oxidation furnace during operation is consistent with the performance of the small-scale stage before the pilot test, and the results of this stage are encouraging: under the same temperature gradient, the pre oxidation cycle is shortened by 30% compared to the traditional industrial hot air process, and the unit energy consumption is reduced by 13% -15% compared to the traditional process, demonstrating significant economic and environmental benefits.

What is more noteworthy is that by establishing an energy consumption model based on existing production data and combining it with the principle of similarity, when scaled up to a 3m wide industrial plant, it is expected to achieve a 20% -25% reduction in energy consumption compared to traditional production. This technological path has clear potential for large-scale promotion.

Comparison of microwave results under 230 ℃ conditions.

At the same time, in the process of developing and verifying the entire process of microwave pre oxidation furnace, the R&D team systematically constructed a multidimensional engineering technology system and experience, including structural design, field coupling control, process matching, etc., forming a reusable and scalable modular knowledge base and parameter database, providing solid support for the rapid development and engineering of larger and wider equipment in the future.

The results of pilot testing will not only stay in the laboratory. Currently, based on the accumulated reliable data and technical reserves, the full process design and verification work of Jinggong Technology's 3m wide industrial grade hot air microwave multi physical field coupling pre oxidation furnace is underway. It can be foreseen that the implementation of this verification work will usher in a more efficient, energy-saving, and green future for domestically produced carbon fiber equipment.