Shaft seal steam supply
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When starting the shaft seal air supply, why is it necessary to first supply steam to the low-pressure shaft seal? Only after it is confirmed that no water is present in the steam coming from the low-pressure shaft seal should steam be supplied to the high and low-pressure shaft seals?
Before supplying steam to the shaft seal, it is necessary to warm up the steam supply pipeline to ensure that all water is drained. Steam must be supplied to the shaft seal while the turbine is rotating continuously. During a cold start, vacuum should be created first before supplying steam to the shaft seal; during a hot start, steam should be supplied to the shaft seal first, followed by creating vacuum. It’s obvious. Steam is supplied to the low-pressure shaft seal first because it is connected to the vacuum system, preventing air from entering the low-pressure cylinder.