Large tow carbon fiber hydrogen energy storage bottle
Dec 01,2022
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Large tow carbon fiber hydrogen energy storage bottle
A new material called carbon fiber“Black Gold”It is widely used in industrial fields. Because of its complex production process, domestic long-term dependence on imports. Now this situation has changed, Sinopec10Month13Japan announced that China's first large wire bundle carbon fiber domestic line, successfully put into production in Shanghai, the domestic carbon fiber market ushered in new development opportunities.
China's first domestic line of large tow carbon fiber
On the production line of the first 10,000-ton large tow carbon fiber project in China, after being processed by spinneret, oxidation furnace and carbonization furnace, the carbon fiber precursor has changed from white to black carbon fiber finished product. In the carbon fiber industry, the number of carbon fibers per bundle is usually greater4.8Ten thousand root called large tow carbon fiber. Each tow has4.8ten thousand fiber Each fiber is only the hair.1/7To1/8The diameter.
Domestic each bundle of carbon fiber is basically in1000Root1.2Between ten thousand roots, called small tow. For a long time, the development of carbon fiber in China has mainly achieved breakthroughs in small tow carbon fiber, but due to the high cost of small tow carbon fiber, it has affected the enthusiasm of downstream enterprises to apply carbon fiber. The biggest advantage of large tow is to achieve low production costs.
At present, Sinopec has developed and trial-produced large tow carbon fiber, which is a kind of carbon fiber with a carbon content95%The above high-strength new fiber materials. Its density is less than the 1/4 of steel, but its strength is steel.7To9times, and also has the characteristics of corrosion resistance. The entire project is planned2024All completed and put into production, with annual large tow carbon fiber production capacity.1.2million tons.
Large tow carbon fiber hydrogen storage bottle track has come
Carbon fiber is an important raw material for the development of strategic emerging industries such as wind power, high-end equipment manufacturing, and new energy vehicles, including hydrogen storage bottles.
In high-pressure gaseous hydrogen storage, there are currently four types of commercialized high-pressure hydrogen cylinders (divided according to different materials of hydrogen storage cylinders), namely pure steel metal cylinders (IType), steel liner fiber winding bottle (IIType), aluminum liner fiber winding bottle (IIIType) and plastic liner fiber winding bottle (IVtype) four.
Among them:1)IThe type bottle is composed of metal steel, which is the largest weight, the lowest cost and the simplest process among the four types of bottles, and is suitable for fixed application scenarios with low pressure requirements;
2)IIThe type bottle is made of metal steel, and the outer layer is wound with glass fiber composite material. The material wrapping form is to wrap the bottle body with hoop type.IIDue to the composite material wrapping on the bottle body, the pressure tolerance of the bottle is higher than that of the bottle.IBottle, but also used in fixed energy supply and other scenarios;
3)IIIThe inner container of the bottle is metal (usually aluminum alloy), but the thickness is relativelyIIThe type bottle is thinned, and the whole bottle body is wound with carbon fiber composite material on the outside. The wrapping form is two-pole laying or spiral laying.IIIThe bottle is light in weight, good in pressure resistance, and suitable for mobile equipment such as hydrogen fuel cell vehicles.35MPaand70MPaTwo, domestic stage35MPaHas achieved mass production;
4)IVThe inner container of the bottle is made of plastic, and the body of the bottle is fully wound with carbon fiber composite material. The package is mixed in the form of two-pole laying and spiral laying.IVThe wall thickness of the bottle is slightly thinnerIIIThe pressure of the gas storage is the same, mainly including.35MPaand70MPaTwo specifications and models, which have been put into commercial use abroad, such as Toyota'sMiraiwith South Korea modernNexoall adoptedIVBottle, but the domestic technology is still lacking, has not yet reached the conditions of mass production.IVType bottles are also mainly used in mobile scenarios such as hydrogen fuel vehicles.
5) In addition, it is currently being studied abroad.VThe cylinder is still wound with carbon fiber composite material, but does not use any inner tank.VThe study of type bottles is still blank. 
The domestic hydrogen storage bottle market is gradually movingIIIType70MpaandIVType70MPaTransition. No matter which type, carbon fiber composite winding is the most important and the key raw material for hydrogen storage bottle manufacturing. Its cost and performance have a significant impact on the cost and performance of hydrogen storage bottles. According to the U.S. Department of Energy (DOE), the cost of carbon fiber composites accounts for the cost of hydrogen storage bottles.60%Above.
The current average selling price of domestic hydrogen storage bottles is2-3Ten thousand yuan/costs, corresponding to the cost of a single on-board hydrogen supply system.20Up and down, the subsequent reduction space is sufficient, the reduction is mainly from the material replacement and other aspects to achieve. In terms of key material carbon fiber, large tow carbon fiber has been used in mature hydrogen fuel cell models such as Japan and South Korea, while the domestic hydrogen storage bottle marketT700The grade small tow carbon fiber still occupies the absolute dominance, the gradual improvement of Sinopec's domestic large tow performance and the continuous breakthrough of supporting research, so that the large tow is expected to achieve a partial or comprehensive replacement of the small tow in the hydrogen storage bottle this sub-scene, driving the reduction of the comprehensive cost of hydrogen storage bottles.
Hunan enrui produces carbon fiber continuous carbonization furnace and continuous graphitization furnace.
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