Questions regarding turbine startup
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1. How do I switch between starting the exhaust pump and the main exhaust pump? Before starting up, a start-up vacuum pump is used to rapidly create a vacuum, after which the turbine is started. So, at what times should these two pumps be turned on and off respectively? 2. Will pressure build up in the main steam pipeline after the turbine trips? Will the safety valve blow off?
It is recommended to check the operating instructions in the device
1. It’s best to refer to the equipment operation manual for your device, as it should also contain detailed explanations! 2. Generally, shutting down a steam turbine has a certain impact on the pipeline network, but such networks are designed with a certain degree of redundancy, so it is unlikely to cause the safety valves in the network to activate.
Construction is in progress; I’m devising the operating method – no mistakes allowed:lol
Civil work is in progress; there is no operating procedure yet
Check the manual provided by the manufacturer; it is a one-to-one match, manufactured based on the parameters supplied by your organization.
As mentioned above, you can ask the manufacturer for it. Also, with the advanced internet we have today, it’s possible to search for relevant operating procedures as a reference.
The vacuum pump you mentioned is likely intended for use during startup; the main pump is used under normal operating conditions. In this case, it should be sufficient to activate the vacuum pump before starting up in order to achieve the required vacuum level. Once the machine is running stably, the main pump can be used, and at that point the vacuum pump can be turned off, while keeping an eye on any changes in vacuum level. The second issue is that safety valves are generally not installed on the side of steam users; there are certainly safety valves in the entire pipeline network, but their set pressure is much higher than the steam pressure after an emergency shutdown. The design takes into account the problem of pressure buildup in the pipes caused by the sudden closure of the quick-shut valves
The turbine trips, causing the pipeline pressure to rise; the boiler safety valve may activate. During startup and shutdown, the auxiliary extractor is used, and once the unit is operating under load normally, it switches to the main extractor. The operation sequence for the main extractor is the reverse of that for the auxiliary extractor
The steam extraction pump is turned on before the unit starts up, while the main steam extraction pump is put into use once the unit is operating normally. Generally, a unit trip does not cause the safety valves in the pipeline network to activate; the pressure in the pipeline network usually fluctuates instead.