Thermal/chemical degradation of ceramic candle filter materials. Final report, September 1988--October 1994

Technical Report · Sat Dec 31 23:00:00 EST 1994

DOI:https://doi.org/10.2172/124987· OSTI ID:124987

High-temperature ceramic candle filters are being developed for use in advanced power generation systems such as the Integrated Gasification Combined Cycle (IGCC), Pressurized Fluidized-Bed Combustor (PFBC), and Direct Coal-Fired Turbine (DCFT). The direct firing of coal produces particulate matter which must be removed to meet both environmental and process limitations. The ceramic candles increase the efficiency of the advanced power generation systems and protect downstream equipment from erosion and impingement of particulate matter in the hot exhaust gases. Ceramic candle filters are rigid, closed-ended (capped on one side) porous cylinders which generally have a flange on the open-ended side. The flange at the open end allows the candle to be suspended by a tubesheet in the filter vessel. Candle filters have shown promise, but have also encountered durability problems during use in hostile, high-temperature environments. Limitations in the candle lifetime lower the economic advantages of using candle filters for this application. Candles typically fail by cracking at the flange or in the body of the candle. The objective of this project was to test and analyze ceramic candle filter materials and to evaluate the degradation mechanisms. The tests were conducted such that the effects of each degradation mechanism could be examined. Separately. The overall objective of the project was to: (a) develop a better understanding of the thermal and chemical degradation mechanisms of ceramic candle filter materials in advanced coal utilization projects, (b) develop test procedures, and (c) recommend changes to increase filter lifetime. 15 refs., 67 figs., 17 tabs.

• Research Organization: Acurex Environmental Corp., Mountain View, CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC21-88MC25203
• OSTI ID: 124987
• Report Number(s): DOE/MC/25203--4007; ON: DE95000079
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
20 FOSSIL-FUELED POWER PLANTS
36 MATERIALS SCIENCE
ALUMINIUM SILICATES
COAL-FIRED GAS TURBINES
COMBINED-CYCLE POWER PLANTS
CORROSION RESISTANCE
DEASHING
DESIGN
EXPERIMENTAL DATA
FILTERS
FLUIDIZED BED BOILERS
FUEL GAS
HOT GAS CLEANUP
MATERIALS TESTING
MEASURING METHODS
MECHANICAL PROPERTIES
PHYSICAL PROPERTIES
PROGRESS REPORT
SERVICE LIFE
SILICON CARBIDES
SODIUM CHLORIDES
THERMAL DEGRADATION