Water quality requirements for internal cooling water of large generators (hollow stator copper wire):
1. pH value (25℃) 8.0-9..0
2. Conductivity (25℃) 0.4-2μs/cm
3. Copper content ≤20μg/L
4. Dissolved oxygen ≤30μg/L
Steam turbine power generation The commonly used cooling methods of the machine are:
(1) Air cooling. It is divided into open air cooling and closed circulation air cooling. So-called open-air cooling consists of the fact that in ordinary small generators the generator fan draws cold air into the engine from the factory building, cools each part, and then exhausts it out of the machine . Closed cycle air cooling is used in large and medium sized generators. After the cooling air exits the generator, it is conducted under the machine pit. After having beentee cooled by a set of air coolers, it is driven into the engine by a. fan. This air always circulates inside to keep the machine clean.
(2) Water cooling. Generally, it is internal double water cooling, that is, the conductors of the stator winding and the rotor excitation winding are hollow, the water from Cooling passes inside the conductors and the stator bore is always cooled by air. Although the cooling efficiency is high, the interior of the driver is prone to scaling and clogging.
(3) Hydrogen cooling. It is divided into two cooling methods: external hydrogen cooling and hydrogen water cooling. External hydrogen cooling is the same as air cooling, except that the cooling fluid changes from air to hydrogen, but the hydrogen cooler changes tfound inside the machine. The difference between water-hydrogen cooling and hydrogen cooling is that the cooling water passes inside the stator winding conductor, and the rest is the same as external hydrogen cooling.