U.S. Department of Energy

Other

Kyei-Sing Kwong

James P Bennett

Jinichiro Nakano

Richard E Chinn

Arthur V Petty

Cynthia P Dogan

The disclosure provides a refractory brick system comprising a chromia refractory brick for operation in the slagging environment of an air-cooled gasifier. The chromia refractory brick comprises a ceramically-bonded porous chromia refractory having a porosity greater than 9% and having carbon deposits residing within the pores. The brick may be further comprised of AlO. The air-cooled gasifier generates a liquefied slag in contact with the refractory brick and generally operates at temperatures between 1250&#xb0; C. and 1575&#xb0; C. and pressures between 300 psi to 1000 psi, with oxygen partial pressures generally between 10and 10atm. The refractory brick performs without substantial chromium carbide or chromium metal formation in the low oxygen partial pressure environment. The inclusion of carbon without chromium carbide formation provides for significant mitigation of slag penetration and significantly reduced refractory wear.

Chromia refractory brick with carbon treatment

The disclosure provides methods of operating a slagging gasifier using a carbon feedstock having a relatively high VOto SiOratio, such as petcoke. The disclosure generates a combined chemical composition in the feed mixture having less than 25 wt. % SiO, greater than 20 wt. % VO, and greater than 20 wt. % CaO. The method takes advantage of a novel recognition that increased levels of SiOtend to decrease dissolution of the VOwhich forms under the reducing conditions of the gasifier, and utilizes the CaO additive to establish a chemical phase equilibria comprised of lower melting compounds. The method further provides for control based on the presence of AlOand FeO, and provides for a total combined chemical composition of greater than about 5 wt. % MgO for use with refractory linings comprised of MgO based refractory brick.

Basic refractory and slag management for petcoke carbon feedstock in gasifiers

A high-chromium refractory material that provides improved resistance to coal slag penetration is presented. The refractory mixture comprises a blend of chromium oxide, aluminum oxide and phosphates. The refractory mixture may be blended with an aggregate and cured. In addition a phosphorous oxide may be blended with chromium oxide and aluminum oxide and additionally an aggregate. The refractory mixture reduces the rate of coal slag penetration into the surface of the cured refractory.

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Albany, OR, United States of America

Kyei-Sing Kwong