原文：http://shenzhen.chinacompositesexpo.com/en/news-detail-92-15201.htmlCarbon fiber is known as the "king of new materials" and has excellent mechanical properties, making it an ideal material for the aerospace (low altitude) economic industry. However, the production and manufacturing of carbon fiber is a complex process with high temperature and energy consumption. When the entire line is running, the power consumption of the pre oxidation furnace group accounts for about 65%. How to effectively reduce this value is a huge challenge.

Recently, the team of Jinggong Technology Carbon Fiber Research Institute announced significant progress in the new heating technology of carbon fiber pre oxidation.

01 Equipment iteration

Microwave multi physics coupling pre oxidation furnace

In the pre oxidation stage of PAN precursor, the required temperature is 180-280 ℃, and the treatment period is relatively long.

According to the experimental results, although PAN fiber bundles cannot effectively absorb microwave energy, under the strengthening effect of microwave field, they canSignificantly accelerate the pre oxidation process of PAN precursor fibersAnd reduce the temperature required for the reaction.

Based on existing experimental data, under the coupling of hot air and microwave, if the same pre oxidation time is used, the pre oxidation temperature of the corresponding stage can be reduced by 15-20 ℃. It is expected that using this technology can reduceLow oxidation furnace energy consumption of about 30%And it is expected toReduce by about 20% or moreThe investment cost of the pre oxidation device.


The team of Jinggong Technology Carbon Fiber Research Institute passedA 0.4m hot air microwave multi physics field coupled pre oxidation furnace with self-developed special structural designAfter simulation analysis, a new heating method was designed and manufactured to achieve uniform distribution of microwave field in the width direction inside the oxidation furnace deviceEnsure the high uniformity of temperature and velocity field distribution inside the furnaceAt the same time, the furnace design allows multiple layers of fiber bundles to operate back and forth, and temperature control technology can be used in the same way as conventional pre oxidation furnaces, which meets the needs of industrial large-scale production and can directly replace existing pre oxidation furnaces.

02 Process Innovation

Surface modification process of PAN precursor fibers

This year, Jinggong Technology has collaborated with renowned domestic universities,Innovative PAN precursor surface modification processUniformly coating a special coating on the surface of the fiber, which has high absorption performance. In the microwave field, the special coating quickly heats up to the reaction temperature required for pre oxidation, which is equivalent to a heating element tightly attached to the original filamentRealize efficient in-situ heating of PAN precursor fibers.

Due to the fact that the air medium inside the furnace has not been heated to the reaction temperature, the temperature of the pre oxidation process needs to be directly controlled for the fiber bundle. utilizeSpecial fluorescence temperature measurement technologyIt can achieve non-contact temperature measurement of the raw wire, with sensitive response and high accuracy, and can achieve precise temperature control under microwave field.


The correspondence between fluorescence emission rate and temperature in the effect of fluorescent dyes

Experiments have shown that the surface modification technology of PAN precursor can significantly reduce the loss of thermal energy in the furnace body and air inside the furnace by directly heating the precursor with microwaveExpected to achieve energy consumption reduction of over 50%In terms of production and cost, this technology only requires an additional process of modifying the surface of the raw silk and a slight cost investment of coating the absorbing material.

Technological innovation empowers high-quality development of industries! At present, China's carbon fiber industry has gone through a stage from scratch to excellence, and some high-performance PAN based carbon fiber production technologies have gradually approached the international leading level. In the future, Jinggong Technology will continue to deepen the innovation and process optimization of carbon fiber equipment technology, constantly explore low-cost innovative production of carbon fiber, and work together with the industry to win the broad application future of carbon fiber new materials. 文章来源：http://shenzhen.chinacompositesexpo.com/en/news-detail-92-15201.html