How does the solenoid valve of the emergency shutdown device in a power generation steam turbine operate?
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It turns out that there is no involvement in the control of power generation turbines (this device is primarily used for gas production, with power generation as a by-product; it is a chemical processing unit). The emergency shutdown devices and ASTs work by using solenoid valves to release pressure and shut down the machine (reduce its speed), which is contrary to the fault-safety principles applied in chemical production; from a chemical production perspective, this approach is considered unreasonable. I wonder what suggestions netizens have?
Atlas’ turbine quick-shut valves operate while powered, and stop when power is lost
Do you mean that this solenoid valve is normally uncharged, and operates when an accident occurs?
Yes, what’s designed here is shutdown with power still connected.
Yes, what’s designed here is shutdown with power still connected.
I also consulted the instrumentation specialists regarding this issue, and they said that solenoid valves that are constantly powered have a relatively high failure rate. . . .
In accordance with GB50770-2013 Code for Safety Instrumentation Design in Petrochemical Industries, the solenoid valve at this location should be normally energized and fail-safe in operation.
This is a normally open solenoid valve: it closes when powered and opens when power is cut off. Since the solenoid coil can overheat and get damaged due to continuous operation under power, it was designed as a normally open type. In the chemical industry, valves used for emergency purposes are usually normally closed, meaning they open when powered and close when power is cut off.