发电机内冷水的处理方式（Treatment method of generator internal cooling water）.doc

发电机内冷水的处理方式（Treatment method of generator internal cooling water） Discussion on the treatment method of generator inner cooling water 1 Overview In general, large generators often adopt two water cooling systems, that is, generator stator and rotor are all cooled by water, and some of them are cooled by water. The rotor and core are cooled by hydrogen. Cooling water is usually used as the cooling water in the generator, and condensed water is used as the backup water source. In addition to water of high purity, can meet the insulation requirements, but the pH value is low, generally in 6 ~ 6.8, the generator stator bar is always in a thermodynamically unstable region, (according to the Cu - H2O system - pH equilibrium diagram has potential) erosion, some of the system according to the introduction, copper and iron metal increases with the decrease of pH of aqueous solutions in water subjected to corrosion. Copper and iron in pH = 8 are corrosion passivation zones, as shown in figure 1. Because of the cold water in pH is low, the copper content in water and electrical conductivity in the high limit, corrosion products may also be online through flow rod deposition, cause local overheating, and even cause local blocked, affect the safe operation of generating units. During the operation of the water cooler leakage and water cooler before operation without washing or flushing thoroughly, will make the impurities in the raw water into the internal water cooling system, causing corrosion and blocking system, so it is necessary to carry out the generator inner cooling water treatment. 2 water quality requirements and quality standards for internal cooling water of generators 2.1 water quality requirements Since internal cooling water is used as a cooling medium in a high voltage electric field, the quality requirements must be based on ensuring the safe and economical operation of the generator. The water quality of the generators internal cooling water shall meet the fol