FUEL INJECTOR NOZZLE WITH PROTECTIVE REFRACTORY INSERT

摘要

The fuel injector nozzle (10) for a gasifier includes a protective recfractory sheath (70) that is flush mounted at a downstream end proximate the nozzle outlet portion (40). The refractory insert (72) is of annular form to surround the nozzle outlet. The annular refractory member can be a one-piece structure or a multi-segment structure. Whether the annular refractory member is a one-piece structure or a multi-segment structure, it is recessed in a downstream end surface of the fuel injector nozzle and retained in the recess by locating pins (110) or by thread-like engagement between a projection (144) and a groove (172) that are provided on complementary inter-engaging surfaces of the recess and refractory member. The enduring presence of the annular refractory member prolongs the service life of the fuel injector by protecting the vulnerable surface areas at the downstream end of the fuel injector nozzle that are close to a hot and corrosive reaction zone within the gasifier.