| 摘要 |
Real time measurement of the purity of one gas in a binary mixture of two known gases applies principles of the fan laws and ideal gas laws to calculate the volume percent purity of the gas directly from measured fan differential pressure. The calculated purity is corrected for variations in temperature and pressure. Determination and use of an appropriate fan constant is required based on the gas whose purity is to be measured and specific to the fan (23) being used and the speed at which it operates. An adjustment factor for differences between design and measured speed may also be applied. Real time measurement of hydrogen gas purity in the cooling gas circulated inside a large synchronous AC generator (10) is provided. A correction factor converts hydrogen purity measured from a dry gas mixture sample to a true hydrogen purity. Actual water vapor content may be calculated in a sample from which hydrogen purity was measured. |
