Effects of Temperature and Particle Size on Deposition in Land Based Turbines

Content Provider	Semantic Scholar
Author	Crosby, Jared M. Lewis, S. Bons, Jeffrey P.
Copyright Year	2007
Abstract	Four series of tests were performed in an accelerated deposition test facility to study the independent effects of particle size, gas temperature, and metal temperature on ash deposits from two candidate power turbine synfuels (coal and petcoke). The facility matches the gas temperature and velocity of modern first stage high pressure turbine vanes while accelerating the deposition process. Particle size was found to have a significant effect on capture efficiency with larger particles causing significant TBC spallation during a 4hour accelerated test. In the second series of tests, particle deposition rate was found to decrease with decreasing gas temperature. The threshold gas temperature for deposition was approximately 960°C. In the third and fourth test series impingement cooling was applied to the backside of the target coupon to simulate internal vane cooling. Capture efficiency was reduced with increasing massflow of coolant air, however at low levels of cooling the deposits attached more tenaciously to the TBC layer. Post exposure analyses of the third test series (scanning electron microscopy and x-ray spectroscopy) show decreasing TBC damage with increased cooling levels. [
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.et.byu.edu/~tom/gas_turbines/BYU_Deposition_Papers/IGTI07-Ra-JournalSubmission-3.pdf
Language	English
Access Restriction	Open
Subject Keyword	Accidents caused by gas turbine Chemical vapor deposition Coal Coal Ash Computer cooling Cool - action Diagnostic radiologic examination Diameter (qualifier value) Efficiency Electron Microscopy Ephrin Type-B Receptor 1, human Germanium Intracisternal A-Particle Elements Large MASON Oxygen 100 % Gas for Inhalation Particle Size Particulate (substance) Physical vapor deposition Plagiocephaly and X-linked mental retardation Simulation Specimen Stage level 1 TBC TOM Test fixture Throughput Units Of Measure - Siemens Velocity (software development) Virtual fixture Westi tubulobulbar complex
Content Type	Text
Resource Type	Article