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Application of double wall heat shrinkable tube in nuclear power plant

Time:2019/10/31 posted:Kehong Enterprises Co.,Ltd.

China's coal accounts for 70% of primary energy consumption. The large consumption of fossil energy makes China the second largest carbon dioxide emitter in the world. Nuclear energy has the outstanding advantages of green, high efficiency, low carbon emissions and scale production. An important choice for change, China's development of nuclear power can not only solve the power supply problem, but also adjust the energy structure and reduce carbon emissions. According to the Medium- and Long-Term Development Plan for Nuclear Power (2005-2020) adopted by the National Development and Reform Commission in October 2007 [1], by 2020, China’s nuclear power installed capacity will reach 40 million kilowatts; however, by 2010, this The target can no longer meet the needs of social and economic development, and the installed capacity of nuclear power will reach 70 million to 80 million kilowatts. By 2030, the installed capacity of nuclear power will increase to 200 million kilowatts, and in 2050 it will increase to 400 million kilowatts. China has built four nuclear power bases in Qinshan, Zhejiang, Daya Bay in Guangdong, Tianwan in Jiangsu and Lingao in Guangdong. There are 13 nuclear power units in operation and an installed capacity of 10.8 million kilowatts.

The 1E-class K1 double-wall heat-shrinkable tube for nuclear power plants is used for terminal connection of wires and cables in the nuclear island. It not only protects the wires and cables under normal environmental conditions, but also protects the earthquake load and accident environment. After the accident, the wire and cable can be sealed and insulated. In the past, only a US TYCO company was able to provide 1E-class K1 double-wall heat-shrinkable tubes for nuclear power plants. China's nuclear power plants use 1E-class K1 heat-shrinkable tubes all rely on imports. Now our own double-wall heat-shrinkable tubes can also be related. standard.

The 1E grade K1 double-wall heat-shrinkable tube structure for nuclear power plant is composed of two layers, the outer layer is a heat-shrinkable layer, and the inner layer is a hot-melt adhesive layer, which is mainly composed of ethylene propylene diene monomer and ethylene-vinyl acetate copolymer. When in use, the outer layer shrinks with heat, and the inner layer melts with heat. Under the action of the outer layer contraction force, the inner layer hot melt adhesive will closely bond the protected portion and the outer layer to prevent moisture from entering the protected portion.





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