Ceramic Membrane Enabling Technology for Improved IGCC Efficiency

Sirman, John ; vanHassel, Bart

Praxair, Inc.

关键词: Coal Gasification;    Membranes;    Pilot Plants;    01 Coal, Lignite, And Peat;    Membrane Transport;   

DOI  :  10.2172/859384
RP-ID  :  none
RP-ID  :  FC26-99FT40437
RP-ID  :  859384

美国|英语

来源: UNT Digital Library

【 摘 要 】

This final report summarizes work accomplished in the program from October 1, 1999 through December 31,2004. While many of the key technical objectives for this program were achieved, after a thorough economic and OTM (Oxygen Transport Membrane) reliability analysis were completed, a decision was made to terminate the project prior to construction of a second pilot reactor. In the program, oxygen with purity greater than 99% was produced in both single tube tests and multi-tube pilot plant tests for over 1000 hours. This demonstrated the technical viability of using ceramic OTM devices for producing oxygen from a high pressure air stream. The oxygen fluxes that were achieved in single tube tests exceeded the original target flux for commercial operation. However, extended testing showed that the mean time to failure of the ceramics was insufficient to enable a commercially viable system. In addition, manufacturing and material strength constraints led to size limitations of the OTM tubes that could be tested. This has a severe impact on the cost of both the ceramic devices, but also the cost of assembling the OTM tubes in a large reactor. As such and combined with significant progress in cost reduction of large cryogenic oxygen separation devices, an economic gain that justifies continued development could not be derived.