(Daily Question) Coal-to-oil and olefins forum, 2018.2.9
Thread Content
3.jpg Participation: Prize of 5 Wealth； Correct answer: Reward of 10 wealth points ； Note: This post is valid for 48 hours. Question: (DMTO) What is the coasting time and coasting curve of the turbine in the olefin separation unit? The time required for the turbine rotor to come to a complete stop, starting from the closure of the automatic main steam valve and the control steam valves, after the turbine is tripped at its rated speed, is referred to as the coasting time ； The curve that shows the relationship between the rotor coasting time and the value of speed reduction is called the coasting curve. Note: The answer will be released automatically in two days!
After the turbine is shut down, due to inertia, the rotor continues to rotate for some time. The time required for the rotor to come to a complete stop, starting from the moment the main steam valve and the throttle valve are closed, is known as the rotor’s coasting time. The curve showing the relationship between the rotor coasting time and the speed drop is called the rotor coasting curve.
The phenomenon in which the rotor of a turbine continues to rotate due to its own inertia after the steam supply is cut off is known as coasting. The time from the moment of tripping (when the main steam valve and control valves close) until the rotor comes to a complete stop is called the coasting time. During the coasting time, the curve relating speed to time is called the coasting curve. Based on the coasting time, it is possible to determine the condition of the bearings, the steam inlet valves, and other related factors. If the idle running time increases, it indicates that there is steam leakage from the unit’s steam inlet valves, or that these valves are not properly sealed, or that other steam is entering the cylinder. If the coasting time is reduced, it indicates that there is rubbing between the moving and stationary parts, or that the bearings are damaged, the vacuum has been disrupted, or it is caused by other related equipment or operating factors. For units equipped with a jacking oil pump, the start time of this pump has a significant impact on the coasting time.
The time required for the turbine rotor to come to a complete stop, starting from the closure of the automatic main steam valve and the control steam valves, after it trips at its rated speed, is called the coasting time； The curve that shows the relationship between the rotor coasting time and the value of speed reduction is called the coasting curve.
The time required for the turbine rotor to come to a complete stop, starting from the closure of the automatic main steam valve and the control steam valves, after it trips at its rated speed, is called the coasting time； The curve that shows the relationship between the rotor coasting time and the value of speed reduction is called the coasting curve.
The phenomenon in which the rotor of a steam turbine generator set continues to rotate on its own inertia after the steam supply is cut off as a result of tripping is known as coasting. The time from tripping to when the rotor comes to a complete stop is known as the coasting time. During the coasting time, the curve that shows the relationship between the rotor and time is called the coasting curve
The phenomenon in which the rotor of a steam turbine generator set continues to rotate due to its own inertia after the steam supply is stopped as a result of tripping is known as coasting. The time from tripping until the rotor comes to a complete stop is referred to as the coasting time. During the coasting time, the curve showing the relationship between the rotor and time is called the coasting curve.
The time required for the turbine rotor to come to a complete stop, starting from the closure of the automatic main steam valve and the control steam valves, after it trips at its rated speed, is called the coasting time； The curve that shows the relationship between the rotor coasting time and the value of speed reduction is called the coasting curve.
The time required for the turbine rotor to come to a complete stop, starting from the closure of the automatic main steam valve and the control steam valves, after it trips at its rated speed, is called the coasting time； The curve that shows the relationship between the rotor’s coasting time and the decrease in rotational speed is called the coasting curve
The time required for the turbine rotor to come to a complete stop, starting from the closure of the automatic main steam valve and the control steam valves, after it trips at its rated speed, is called the coasting time； The curve that shows the relationship between the rotor’s coasting time and the decrease in rotational speed is called the coasting curve
The phenomenon in which the rotor of a steam turbine generator set continues to rotate due to its own inertia after the steam supply is stopped as a result of tripping is known as coasting. The time from tripping until the rotor comes to a complete stop is referred to as the coasting time. During the coasting time, the curve that shows the relationship between the rotor and time is called the coasting curve