CAVT
COLD AIR VELOCITY TEST
Objectives of CAVT : -
- To determine the areas/ locations at which velocities are higher than respective plane average velocity.
- To determine the area of air ingress in to second pass of the boiler.
- To determine the gas flow pattern in the respective zones.
- To determine the MCR velocities at respective zones.
- Easily deployed.
Process of CAVT : -
- Taking velocity measurements at predetermined planes and locations
- Computing plane average velocity
- Reducing velocity data to normalize velocity
- Study & analysis of normalized velocities
- Locating high velocity locations
- Mapping of high velocity over erosion prone areas
- Determining areas requiring velocity corrections
- Design, Manufacture, Supply & Install Erosion Control Device (Expanded Metal Screens).
- Carry out Post CAVT
BENEFITS OF CAVT : -
- CAVT explains why fly ash erosion is still the most important failure mechanism.
- The high velocities will be reduced near average normalize velocities at various Zones.
- To determine the gas flow pattern in the respective zones.
- Due to reduction of high velocities, tube erosion will be reduced in such areas.
- The boiler can run continuously and reduce the generation loss which was earlier on accounts of tube leakages in second pass.
