Hydrogen - cooled generator

Hydrogen cooled generator is a generator cooled by hydrogen gas. Because the operation of the generator will produce energy loss, the loss in the form of active power into heat. If these heat is not emitted, it will raise the temperature of the generator, deteriorate the insulating material and age, threatening the normal operation of the unit. Therefore, an additional cooling system must be added to take away the heat generated by the loss inside the generator. Modern large generating units basically use hydrogen as the cooling medium.

　　二、氢气冷却系统

2. Hydrogen cooling system

1, hydrogen

Among the gases, hydrogen has the best thermal conductivity, and its thermal conductivity coefficient is 6.69 times that of air. Therefore, when hydrogen is used instead of air as the cooling medium of the generator, the thermal conductivity of the insulating material itself can be improved on the one hand, and the thermal conductivity in the gap between the insulating layer can be improved on the other hand, so as to improve the cooling effect of the generator.

In addition, hydrogen has a high surface heat dissipation factor, 1.5 times that of air. The larger the surface heat dissipation coefficient is, the more heat is emitted under the same temperature difference, which is beneficial to reduce the surface temperature difference and improve the cooling effect.

When using hydrogen as generator cooling medium, there are also certain disadvantages, that is, hydrogen and air or oxygen are easy to form explosive gases, so special attention should be paid to safety when using.

2. Hydrogen cooling system

Hydrogen - cooled generator Hydrogen system is a hydrogen-cooled turbo-generator that requires the establishment of a dedicated gas supply system. Its main functions: to fill the generator with hydrogen and air; Carry out the replacement of the two kinds of gas, fill the leakage; Automatically monitors and maintains hydrogen pressure rating and purity.

Three, hydrogen leakage

Hydrogen leakage is a common phenomenon in the operation of hydrogen-cooled generators. Hydrogen leakage is one of the main technical indicators for the safe operation of hydrogen-cooled generators. A large amount of hydrogen leakage will lead to a drop in hydrogen pressure, affecting the cooling of the generator and limiting the load of the generator. Serious hydrogen leakage can cause fire around the generator, or even cause hydrogen explosion, causing generator damage and even shutdown of the unit. Therefore, one of the necessary conditions to maintain the normal operation of the hydrogen cooled generator is to maintain the normal operation of the hydrogen system, including ensuring the hydrogen pressure in the machine, ensuring the normal temperature and temperature difference of the cold hydrogen in the machine, and ensuring the purity of the hydrogen in the machine.

There are two main ways of hydrogen leakage in generators: external leakage and internal leakage. The production and installation process of sealing tile liner, the parallelism of sealing tile and the axial and radial clearance of sealing tile, the installation position of the large end cover, middle ring and sealing tile of the generator, the glue injection situation of the generator, the installation situation of flange cushion, and the installation of temperature measuring elements will have an impact on hydrogen leakage.

1, the leakage

Due to the fast diffusion and strong permeability of hydrogen, coupled with the hydrogen leakage carried by the sealing oil, the hydrogen in the generator continues to leak out during the actual operation.

2, inner leakage

Hydrogen leaks into the sealing oil system and rotor conductive screw through the sealing tile, which belongs to the dark leakage. The location of the leakage point is not obvious, the inspection and treatment is more complex, and the treatment time is long, which affects the insulation and service life of the generator stator rod, and threatens the safe and stable operation of the generator cycle.

Four, electrical sealing hydrogen sealant

PowerOX6332W, 6332B electric hydrogen sealing adhesive is Shanghai Weineng New Material Technology Co., Ltd. independent research and development, production of special hydrogen cooling generator set hydrogen sealing products. The product has passed the ISO9001:2015 quality management system certification, which is the first of its kind in China and can completely replace imports. At the same time, the company as a qualified supplier of major domestic OEMs, electrical sealing hydrogen sealant and other products as the generator production of supporting products used, has been widely recognized by OEMs and power enterprises.

6332W, 6332B electrical seal hydrogen sealant is mainly used for steam turbine generator motor end cover, hydrogen refrigerant grooves, motor outlet bushing and outlet cover plane seal. In addition, in the process of generator maintenance, in order to effectively solve the problem of old hydrogen sealing sealant cleaning treatment, the power new material specially developed quick cleaning L special cleaning agent. The cleaning agent is specially used for cleaning hydrogen sealant, which can significantly improve the cleaning efficiency and cleaning effect.

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