Gasifier Refractories, Coal Slags, and Their Interaction
Gasification offers a clean, efficient, and flexible way to convert carbon based materials into electricity, hydrogen, and other chemical products. The conventional commercial hot face Cr2O3 gasifier refractory materials; which are used to protect the outer steel containment shell from gasification environment attack, suffer from chemical dissolution and slag penetration causing chemical corrosion and structural spalling. The effects of chemical corrosion and structural spalling are to reduce refractory service life. Several years ago, The National Energy Technology Laboratory, (NETL) US DOE developed a phosphate containing Cr2O3 refractory and demonstrated it can dramatically decrease slag penetration depth and extend refractory service life in laboratory cup, rotary drum tests, and field test panels. Coal is one of the major feedstock in gasifiers. Slag properties from impurities in coal affect not only the operation of a gasifier, but also the performance of a Cr2O3 refractory liner. US coal slag properties were thermodynamically investigated, including liquidus temperature, viscosity, primary phase precipitation, and solid content at temperatures from 1300 to 1600 °C in 20 °C increments. Slag interactions with Cr2O3 refractory were studied in laboratory tests, thermodynamic calculations, and post mortem analyses of spent gasifier refractories. Post mortem analysis of commercial and NETL developed refractories were conducted by XRD, ICP, and SEM to determine the failure mechanisms, to study the reaction between gasifier slags and refractories, and to evaluate the performance of NETL developed phosphate containing refractories.
IGCC Gasification coal slag Cr2O3 refractories phosphate
Kyeising Kwong James Bennett Jinichiro Nakano
National Energy Technology Laboratory, US Department of Energy, 1450 SW. Queen Ave., Albany, OR 9732 National Energy Technology Laboratory, US Department of Energy, 1450 SW. Queen Ave., Albany, OR 9732
国际会议
Ninth International Conference on Molten Slags,Fluxes and Salts(第九届国际熔渣、溶剂与熔盐学术会议 MOLTEN12)
北京
英文
1-13
2012-05-27（万方平台首次上网日期，不代表论文的发表时间）