Regarding the turbine speed control system
Thread Content
I’m not very familiar with the speed control system of the turbine-driven steam engines used in screw compressors, especially things like incorrect throttle settings. Could someone explain to me the shutdown unloading valve, the throttle control mechanisms, as well as the oil circuits related to the main steam valves and other components of this speed control system? Thank you!
Search on the forum for Hangzhou Automobile; there is a lot of information available.
Take a look at what’s on this link; there are many more in the forum, go and find them yourself! http://www.cmee.zju.edu.cn/tsps/*angguanlianjie/22.ppt#256,1,Slide 1
The shutdown unloading valve is the quick-shut valve and the quick-shut oil return valve. Inside the quick-shut valve there is a piston; one side of this piston is connected to the valve head of the quick-shut valve, while the other side has a spring. The oil inlet pipe connected to the valve head side is the quick-shut oil inlet pipe, and the oil inlet pipe on the side of the spring is the starting oil inlet pipe. When the quick-shut valve is to be opened, first the starting oil inlet valve opens, allowing starting oil to flow in and establish normal starting oil pressure. After that, the quick-shut oil inlet valve opens as well, allowing quick-shut oil to flow in and establish normal quick-shut oil pressure as well as secondary oil pressure. Then the starting oil inlet valve is closed, and the starting oil flows back. Under the action of the quick-shut oil pressure, the spring in the quick-shut valve is compressed through the piston inside the valve; the piston begins to move toward the side of the spring, causing the quick-shut valve to start opening until it is fully open. At this point, the spring is completely compressed. At this stage, the unloading valve is opened, allowing the quick-shut oil to be released under pressure. The spring expands due to its own elasticity, causing the piston of the quick-shut valve to push the valve head rapidly toward the valve opening, thereby closing the quick-shut valve instantly.
The speed control system of a steam turbine has a very complex structure, with too many pipelines