According to the Fraunhofer Applied Research Consortium in Germany, a family-friendly fuel cell power generation unit developed by the Fraunhofer Institute for Ceramics Technology and Systems (IKTS) has entered the pilot phase before mass production. . The biggest advantage of this fuel cell device is that it directly utilizes gas-fired power generation and can be directly connected to the gas supply network without the use of pure hydrogen. It first converts the gas to a hydrogen-rich gas mixture through a converter and then to the fuel cell module. This mixed gas reacts with oxygen in the air in the (combustion chamber) and outputs electric energy and heat energy through a "cold combustion process." The generated electricity is directly used in residential buildings without the need of transmission through the power network cable to reduce losses. At the same time, because the gas is directly converted into electricity, it also recovers and utilizes the remaining unused gas in the exhaust gas of the fuel cell through the final burner, and the gas utilization rate is improved. Increasing greenhouse gas emissions compared to traditional processes that use gas heating and electricity generation. The fuel cell core assembly (combustion chamber) operating temperature up to 850 degrees Celsius, made of fixed oxide material, so that the cost is greatly reduced, the electrode material is high temperature conductive ceramic. This kind of fuel cell power generation device is similar in appearance to the common gas heater. The power of a single device is 1 kilowatt, which can basically meet the electricity demand of a family of four. Currently, with the support of the Federal Ministry of Transport of Germany, the Institute cooperates with Vaillant, a major gas-fired heating equipment manufacturer in Germany, to conduct trial operation of the device in the practical environment of residents' homes. The project has also received support from the European Union and is being carried out in 12 countries in the European Union. The number of experimental prototypes invested is 150.
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(1) are generally made of carbonized carbon steel (accounting for 99% of total production). It can also be made of stainless steel or non-ferrous metals.
(2) The product must be heat treated. Carbon steel tapping screws must be carbonized and stainless steel tapping screws must be solution hardened. In order to make tapping screws to meet the requirements of the standard of mechanical properties and performance.
(3) The product surface hardness is high, the core toughness is good. That is, "soft inside strong outside". This is a major feature of tapping Screw performance requirements. If the surface hardness is low, it can not be screwed into the matrix; If the core toughness is poor, a twist will break, can not be used. So "inside soft outside steel" is self-tapping screw to meet the use of performance, very important requirements.
(4) The surface of the product needs surface protection treatment, generally electroplating treatment. Some product surface must be treated by phosphate (photostatting), such as wall panel self - tapping screws for photostatting.
(5) Production by cold heading process. It is recommended to use high-speed cold heading machine and high-speed wire rolling machine or high-speed planetary wire rolling machine. High speed is emphasized here to ensure product quality. Only the head of tapping screw produced by high-speed machine is well formed and the thread quality is high.