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Chromia Refractory Brick with Carbon Treatment for Resistance to Slag Penetration in Gasifier Envrionments

National Energy Technology Laboratory

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Technology Marketing Summary

Research is active on the development of a chromia refractory brick composed principally of Cr2O3, Al2O3, and carbon deposits for operation in the slagging environment of a gasifier operating at temperatures between 1250o C and 1575o C, pressures between 300 and 1000 psi, and oxygen partial pressures between 10-4 and 10-10. This invention is available for licensing and/or further collaborative research from the U.S. Department of Energy’s National Energy Technology Laboratory (NETL). 

Description

Gasification is a high temperature/pressure chemical process is used to convert a carbon feedstock in to CO and H2 for use in power generation and the production of chemicals. It is also a source of hydrogen. Gasifiers are processing vessels containing high temperatures and pressures. They are also being considered as a critical component of advanced power generation technologies that target near zero emissions because they facilitate efficient CO2 capture for storage or reuse. During gasification, impurities in the carbon feedstock liquify, forming a slag that attacks the refractory liner used to protect the high-pressure containment shell where gasification occurs, resulting in significant wear, reduced service life, and replacement costs. This technology can provide a porous high chromia refractory brick for gasifier environments where slag penetration is mitigated through use of carbon arranged in a manner compatible with the high chromium content of the refractory brick, reducing significant decreases in material performance.

Benefits

· The technology provides a way to mitigate penetration of slag into the refractory, reducing structural spalling in gasifiers thereby lengthening the service life of gasifiers

· The new material is compatible with the high chromium content of refractory bricks used in typical gasifiers

· The ceramically-bonded Cr2O3 porous brick has carbon within its pores that acts as a component in an air-cooled slagging gasifier where high chrome oxide content materials are advantageous

Applications and Industries

· Gasifier refractory liners vulnerable to slag penetration and resulting degradation

· Power generating facilities and chemical production operations using gasifiers

Patents and Patent Applications
ID Number
Title and Abstract
Primary Lab
Date
Patent 9,598,318
Patent
9,598,318
Chromia refractory brick with carbon treatment
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 Al.sub.2O.sub.3. The air-cooled gasifier generates a liquefied slag in contact with the refractory brick and generally operates at temperatures between 1250.degree. C. and 1575.degree. C. and pressures between 300 psi to 1000 psi, with oxygen partial pressures generally between 10.sup.-4 and 10.sup.-10 atm. 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.
U.S. Department of Energy 03/21/2017
Issued
Technology Status
Development StageAvailabilityPublishedLast Updated
PrototypeAvailable06/15/201706/15/2017

Contact NETL About This Technology

To: Jessica Sosenko<jessica.sosenko@netl.doe.gov>