Guangzhou Special Pressure Equipment Inspection and Research Institute

Zhenling Wu

Bo Yang

Maodong Li

Shiping Li

Zhigang Chen

Jinmei Lin

Zhigang Wang

Wei Zhai

Guojia Huang

Shuanghong Zhang

Lin Wei Yang

Hui Zhang

Yue Li

Wen Yu

Mingliang Xin

Fang Wen

Huachao Guo

Yingyi He

Wenxian Huang

Yuhui Du

Xiedong Lin

A lightning strike fault monitoring system for a wind turbine generator system and a lightning protection system () thereof, wherein the lightning strike fault monitoring system for the wind turbine generator system includes the lightning protection system. The lightning protection system () comprises a main body () provided with a blind hole (), a core (), a connecting member () made of gasifiable material, a first elastic member (), a second elastic member (), a sealing cover (), a bottom plate (), and a switch used for connecting between an external signal source and a detecting terminal. The core () and the first elastic member () are respectively accommodated in the blind hole (), and the core () is connected to the main body through the connecting member (). One end of the first elastic member () abuts against the core (), and the other end is connected to the bottom wall of the blind hole (). One side of the sealing cover () is connected to the bottom plate () through the second elastic member (), and the other side of the sealing cover () abuts against the core (). The switch is mounted on the bottom plate (). The lightning protection system () can accurately provide electrical signals for the detecting terminal, so that maintainer can be accurately aware of the occurrence of a lightning strike in order to perform maintenance and troubleshooting of lightning strike failure, thereby improving safety.

Lightning strike fault monitoring system for wind turbine generator system and lightning protection system

Provided is a method for preparing graphene by liquid-phase ball milling exfoliation, including following steps: mixing a transition metal halide salt, a nitrogen source substance and an organic solvent to prepare an intercalation agent; mixing the intercalation agent with graphite, carrying out ball milling, and then performing centrifugation to obtain a graphite intercalation compound; washing and filtering the graphite intercalation compound obtained, adding an expansion agent, and carrying out ultrasonic agitation to obtain a graphene dispersion; and washing, filtering and drying the graphene dispersion to obtain graphene powder.

Method for preparing graphene by liquid-phase ball milling exfoliation

A phosphorus-free corrosion and scale inhibitor used in circulating cooling water of central air conditioning is provided, which contains tourmaline, green corrosion and scale inhibitor, zinc salt and the like, wherein the content of the tourmaline is 5-500 g/t (calculated based on solid form); the content of the green corrosion and scale inhibitor is 5-50 g/t (calculated based on liquid form); and the content of the zinc salt is 0.2-0.8 g/t (calculated based on solid form), wherein the tourmaline includes dravite, schorlite, elbaite, manganese tourmaline, uvite or the like. The green corrosion and scale inhibitor contains any one, or two or three of polyaspartic acid, polyepoxysuccinic acid and polymaleic acid. Copper corrosion can be effectively inhibited by adding 0.2-2 g/t of benzotriazole (calculated based on solid form) into copper-containing devices. Also disclosed is a method of preparing the phosphorous-free corrosion and scale inhibitor used in circulating cooling water of central air conditioning.

Phosphorus-free corrosion and scale inhibitor used in circulating cooling water of central air conditioning and its preparation method

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Guangzhou, China

Zhenling Wu