Month: July 2021
ROTOR DEFORMATION DURING SHUT DOWN
“Overall, the mitigation through slow rotation aims to minimize thermal stresses, differential expansion, and associated mechanical problems in steam turbines during startup, shutdown, or other operational transitions..” 1. Introduction: 2. Consequences of Steam Admission Stopping: 3. Potential Issues with a Stationary Rotor: 4. Thermal Gradient within the Casing: 5. Thermal-InducedRead More
BARRING GEAR & AVOIDING STALLING
Barring gear is mechanism which rotate turbine shaft (with generator) when motive steam is not available i.e. when turbine is in trip condition. Steam turbine is on barring means turbine shaft rotates on a speed of 60-90 rpm without vacuum & while on vacuum rotates 120-140 RPM. At this lowRead More
FEED WATER SYSTEM
INTRODUCTION The source of feed water is FST into the feed water system, (in other words, we may say that FWS starts here). In FST water coming from Deaerator after deaeration process & stored in to feed storage tank (also initial make up line is provided used for pre fillingRead More
AUXILIARY PRESSURE REDUCING & DESUPERHEATING STATION (APRDS)
OBJECTIVE Auxiliary steam is the steam that is required for various auxiliary requirements in a power plant. A part of main steam is tapped off for auxiliary steam station from MS/CRH line, after pressure reducing and de-superheating up to 16 kg/cm2 & 320 °C. At the HT header (16 Kg/cm2 &Read More
GOVERNING SYSTEM OF STEAM TURBINE
Governing system is a device or combination of different system & logics which are used to control the speed of a steam turbine. A governor protects the prime mover from over speed & keeps the prime mover speed at or near the desired RPM. When a prime mover drives generatorRead More