Evaluation of candidate materials in a static turbine cascade

Technical Report · Sat Jun 01 04:00:00 EDT 1985

OSTI ID:5537018

An important part of the tests has been the evaluation of a range of materials in a static cascade. Some of these materials are considered candidates for the manufacture of blades for a gas turbine powered by a Pressurised Fluidised Bed Combustor and some are materials with well known properties included as corrosion indicators. This testing has been accomplished using a static cascade of specimens through which approximately 5.5 kg/s of gas was passed after solids removal by three stages of cyclone. The cascade consisted of five stages of specimens. The first three stages each consisted of nine impulse aerofoils, which turned the flow but did not accelerate it. The fourth stage was made up of nine reaction blades which both turned the flow and accelerated it to near sonic velocity, whereupon the flow entered the fifth stage which consisted of three erosion targets. Half of the impulse specimens and one of the erosion targets were cooled by air. The specimens were exposed for a total of 647 hours. After each of the sub-series, ten specimens were replaced and the specimens removed subjected to detailed examination. After the total period, a further five specimens which had been exposed for the full operating period were removed for examination. The remaining twenty-four specimens are to receive further hours of exposure in the follow-on programme at Grimethorpe. Details of the exposure conditions and the results of the examinations of the specimens are presented. It is most encouraging that no evidence was found of erosion of the blades by particles of entrained dust; however, there was evidence of Type II, low temperature, hot corrosion on many of the specimens, but this is to be expected in view of the operating temperatures at the inlet to the cascade.

• Research Organization: NCB (IEA Grimethorpe) Ltd., Grimethorpe, Barnsley, South Yorkshire (UK)
• DOE Contract Number: AI01-76ET10393
• OSTI ID: 5537018
• Report Number(s): DOE/ET/10393-1859; ON: DE85008592
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL
COHERENT SCATTERING
COMBINED-CYCLE POWER PLANTS
COMBUSTION
COMBUSTION PRODUCTS
COMBUSTORS
CONCENTRATORS
CORROSION
CORROSIVE EFFECTS
CYCLONE SEPARATORS
DATA
DEPOSITS
DIAGRAMS
DIFFRACTION
ENERGY SOURCES
EQUIPMENT
EROSION
EXPERIMENTAL DATA
FLUIDIZED-BED COMBUSTION
FLUIDIZED-BED COMBUSTORS
FOSSIL FUELS
FUELS
GAS TURBINES
INERTIAL SEPARATORS
INFORMATION
INTERNATIONAL ENERGY AGENCY
INTERNATIONAL ORGANIZATIONS
MACHINERY
MATERIALS
MATERIALS TESTING
MEDIUM PRESSURE
METALLOGRAPHY
NUMERICAL DATA
OXIDATION
PERFORMANCE
POLLUTION CONTROL EQUIPMENT
POWER PLANTS
SCATTERING
SEPARATION EQUIPMENT
TEMPERATURE MEASUREMENT
TESTING
THERMAL POWER PLANTS
THERMOCHEMICAL PROCESSES
TURBINE BLADES
TURBINES
TURBOMACHINERY
X-RAY DIFFRACTION