refractory-lined firebox boiler

refractory-lined firebox boiler

[ri′frak·trē ¦līnd ′fīr‚bäks ‚bȯil·ər]
(mechanical engineering)
A horizontal fire-tube boiler with the front portion of the shell located over a refractory furnace; the rear of the shell contains the first-pass tubes, and the second-pass tubes are located in the upper part of the shell.