| Revista: | Materials research |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000312786 |
| ISSN: | 1516-1439 |
| Autores: | Hou, Peggy1 MacAdam, Stuart Niu, Yan2 Stringer, John3 |
| Instituciones: | 1University of California, Lawrence Berkeley National Laboratory, Berkeley, California. Estados Unidos de América 2Chinese Academy of Sciences, Shenyang, Liaoning. China 3Electric Power Research Institute, Palo Alto, California. Estados Unidos de América |
| Año: | 2004 |
| Periodo: | Ene-Mar |
| Volumen: | 7 |
| Número: | 1 |
| Paginación: | 71-80 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Nota breve o noticia |
| Enfoque: | Experimental |
| Resumen en inglés | Heat-exchanger tubes in fluidized bed combustors (FBCs) often suffer material loss due to combined corrosion and erosion. Most severe damage is believed to be caused by the impact of dense packets of bed material on the lower parts of the tubes. In order to understand this phenomenon, a unique laboratory test rig at Berkeley was designed to simulate the particle hammering interactions between in-bed particles and tubes in bubbling fluidized bed combustors. In this design, a rod shaped specimen is actuated a short distance within a partially fluidized bed. The downward specimen motion is controlled to produce similar frequencies, velocities and impact forces as those experienced by the impacting particle aggregates in practical systems. Room temperature studies have shown that the degradation mechanism is a three-body abrasion process. This paper describes the characteristics of this test rig, reviews results at elevated temperatures and compares them to field experience. At higher temperatures, deposits of the bed material on tube surfaces can act as a protective layer. The deposition depended strongly on the type of bed material, the degree of tube surface oxidation and the tube and bed temperatures. With HCl present in the bed, wastage was increased due to enhanced oxidation and reduced oxide scale adherence |
| Disciplinas: | Ingeniería |
| Palabras clave: | Ingeniería de materiales, Ingeniería industrial, Ingeniería mecánica, Lecho fluidizado, Degradación, Erosión, Corrosión, Alta temperatura, Acero |
| Keyword: | Engineering, Industrial engineering, Materials engineering, Mechanical engineering, Fluidized bed, Degradation, Erosion, Corrosion, High temperature, Steel |
| Texto completo: | Texto completo (Ver HTML) |
