Advanced turbine design for coal-fueled engines

Technical Report · Fri Jul 17 04:00:00 EDT 1992

DOI:https://doi.org/10.2172/7141084· OSTI ID:7141084

Bornstein, N S

The objective of this task is to perform a technical assessment of turbine blading for advanced second generation PFBC conditions, identify specific problems/issues, and recommend an approach for solving any problems identified. A literature search was conducted, problems associated with hot corrosion defined and limited experiments performed. Sulfidation corrosion occurs in industrial, marine and aircraft gas turbine engines and is due to the presence of condensed alkali (sodium) sulfates. The principle source of the alkali in industrial, marine and aircraft gas turbine engines is sea salt crystals. The principle source of the sulfur is not the liquid fuels, but the same ocean born crystals. Moreover deposition of the corrosive salt occurs primarily by a non-equilibrium process. Sodium will be present in the cleaned combusted gases that enter the PFBC turbine. Although equilibrium condensation is not favored, deposition via impaction is probable. Marine gas turbines operate in sodium chloride rich environments without experiencing the accelerated attack noted in coal fired boilers where condensed chlorides contact metallic surfaces. The sulfates of calcium and magnesium are the products of the reactions used to control sulfur. Based upon industrial gas turbine experience and laboratory tests, calcium and magnesium sulfates are, at temperatures up to 1500[degrees]F (815[degrees]C), relatively innocuous salts. In this study it is found that at 1650[degrees]F (900[degrees]C) and above, calcium sulfate becomes an aggressive corrodent.

• Research Organization: United Technologies Corp., East Hartford, CT (United States). Research Center
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC21-89MC26052
• OSTI ID: 7141084
• Report Number(s): DOE/MC/26052-3140; ON: DE93000224
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330103* -- Internal Combustion Engines-- Turbine
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM SULFATES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
COMBUSTORS
CORROSION
CORROSIVE EFFECTS
DEPOSITION
EQUIPMENT
FLUIDIZED-BED COMBUSTORS
GAS TURBINES
HALIDES
HALOGEN COMPOUNDS
MACHINERY
MAGNESIUM COMPOUNDS
MAGNESIUM SULFATES
OXYGEN COMPOUNDS
PRESSURIZATION
SULFATES
SULFIDATION
SULFUR COMPOUNDS
TURBINE BLADES
TURBINES
TURBOMACHINERY