A basic chemical discovery will soon make trees play an important role in high-tech energy storage devices. Researchers at Oregon State University in the United States have discovered that simple chemical methods can turn the most abundant organic polymer on the earth, a key component of the tree, cellulose, into a component of a supercapacitor. The results of this study are published in the latest issue of Nano Express. Supercapacitors are extraordinary high-power energy devices that are used in a wide range of industries from electronics to automotive and aerospace applications. The high cost has always been a hindrance to its promotion and production of high-quality carbon electrodes. A new method developed by Oregon State University can produce nitrogen-doped nanoporous carbon film supercapacitor electrodes at low cost, quickly and environmentally friendly. The only by-product methane can be used as fuel. “This simple, fast, and promising process is very exciting,†said Ji Xiurei, the lead author of the study and an assistant professor of chemistry at the university. This is the first time that ammonia can be reacted with cellulose to create these Nitrogen-based nanoporous carbon membranes. Surprisingly, this basic chemical reaction has not been reported before. We will turn cheap wood into valuable high-tech products." According to the Daily Science Network and Physicist Organization Network, reported on April 7, these nanometer-scale carbon films are quite thin, with a surface area of ​​nearly 2,000 square meters per gram, which is what makes them useful in supercapacitors. section. New process operations are quick and inexpensive, as simple as cellulose filter paper, conceptually similar to the disposable paper filters of coffee makers. At high temperatures and ammonia, cellulose is converted to the nanoporous carbon material of the desired supercapacitor and can be produced on a large scale and at low cost. The supercapacitor made of this material is an energy storage device that is much faster than battery charging and has more power. Most of them are used in various types of equipment that require fast storage and can release powerful energy. Supercapacitors can be used in computers and consumer electronics products such as flashlights and digital cameras; in heavy industry, they can power any equipment from cranes to forklifts; they can also capture other energy that may be wasted, such as the braking system. operating. Its energy storage capacity can activate defibrillators, open emergency slides on aircraft, and greatly increase the efficiency of hybrid electric vehicles. In addition, nanoporous carbon materials can also be used for the adsorption of gaseous pollutants, environmental filters and water treatment. Researchers said: “Supercapacitors have many applications around the world, but the development in this area is now greatly constrained by costs. If we use this fast and simple process to manufacture energy storage device devices, there will be huge benefits in the future. "(Hua Ling) The disc of the wafer butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical channel of the butterfly valve body, the disc-shaped disc rotates around the axis, and the rotation angle is between 0° and 90°, which can play the role of flow regulation. When the disc rotates to 90°, the valve reaches the maximum opening. Butterfly Valves,Ss Butterfly Valve,Stainless Steel Butterfly Valve,Stainless Butterfly Valve Inner Mongolia Overseas.Trade co.,LTD , https://www.flangevalvejoint.com
Compared with the gate valve, the wafer butterfly valve has the characteristics of simple structure, small volume and light weight.
It consists of only a few parts. And it only needs to rotate 90° to open and close quickly, the operation is simple, and the valve has good fluid control characteristics.
When the butterfly valve is in the fully open position, the thickness of the butterfly plate is the only resistance when the medium flows through the valve body, so the pressure drop generated by the valve is very small, so it has better flow control characteristics. Butterfly valve has two types of sealing type: elastic soft seal and metal seal. Elastic soft sealing valve, the sealing ring can be embedded on the valve body or attached to the periphery of the disc.
Valves with metal seals generally have a longer life than those with elastic seals, but it is difficult to achieve complete sealing. Metal seals can adapt to higher operating temperatures, while elastic soft seals have the defect of being limited by temperature.
When the project is used and installed, the double-headed butterfly valve is connected between the two pipeline Flanges with stud bolts, and the flanges at both ends of the valve are connected to the pipeline flange with bolts.
The wafer butterfly valve has good sealing performance, light operation, secondary corrosion, high temperature resistance, convenient operation, flexibility, safe and reliable use, and has been widely used.
Widely used in cooling water systems of petroleum, gas, chemical, water treatment, thermal power stations, and SO2, steam, air, gas, ammonia, CO2, oil, water in chemical, petrochemical, smelting, pharmaceutical, food and other industries , Brine, lye, seawater, nitric acid, hydrochloric acid, sulfuric acid, phosphoric acid and other media pipelines are used as adjustment and interception devices.
Divided by structure
(1) Center sealing butterfly valve (2) Single eccentric sealing butterfly valve (3) Double eccentric sealing butterfly valve (4) Triple eccentric sealing butterfly valve
According to the sealing surface material is divided into
(1) Soft sealing butterfly valve.
1) The sealing surface is composed of non-metallic soft material to non-metallic soft material.
2) The sealing surface is composed of metal hard material and non-metal soft material.
(2) Metal hard sealing butterfly valve.
The sealing surface is composed of metal hard material to metal hard material.
Divided by material: cast iron, cast steel, stainless steel