The main reason is that the differential pressure valve and the balance valve do not track well. The reason for poor hydrogen purity is that the balancing valve does not follow the differential pressure valve well. One side is high and the other side is high. You must first look at the differential pressure curve of the differential pressure valve. If it is relatively stable, there may be a problem with the balance valve. If the differential pressure valve changes significantly, the problem may be with the differential pressure valve.
Not equal, there must be a certain pressure difference between the two
During normal operation, the pressure of the sealing oil should be 0.056 MPa higher than the pressure of hydrogen. The pressure of the hydrogen changes accordingly. temperature or other reasons, the differential pressure valve must change accordinglynsequence. High differential pressure will cause sealing oil to enter the generator, and low differential pressure will cause hydrogen leakage due to poor sealing. Therefore, when the oil-hydrogen differential pressure is greater than 0.084 MPa, the opening of the main differential pressure valve increases and part of the air-side oil is drained to ensure that the oil-hydrogen pressure difference is maintained at 0.084 MPa. The differential pressure is less than 0.084 MPa, the main differential pressure. The opening is reduced to ensure that the differential pressure is maintained at 0.084 MPa by reducing the amount of air-side oil leakage. When the system fails and the differential pressure is less than 0.056 MPa, it will cause significant hydrogen leakage from the generator. Therefore, once the oil-hydrogen differential pressure is lowere at 0.056 MPa, the emergency differential pressure valve opens to supply. high or low pressure emergency oil from the turbine to the air side sealed oil circuit. Once the differential pressure valve fails to track properly, the oil-hydrogen differential pressure will be too high or too low. If the differential pressure is too low, it will cause hydrogen leakage.