A catechism on the combustion of coal and the prevention of smoke; a practical treatise . e secured tothe tube sheet at one end, the other end being secured tothe crown sheet. There is a water circulation throughthese pipes which prevents their burning out in the fur-nace. Another design is shown in Fig. 46, in which thetubular bearing bars extend the whole length of the firebox, the water connection being such that a constant cir-culation is had. The fire-brick tiles extend across thefire box from side to side; the arch is lowest next the tube 252 COMBUSTION OF COAL. sheet, and inclines upwar
A catechism on the combustion of coal and the prevention of smoke; a practical treatise . e secured tothe tube sheet at one end, the other end being secured tothe crown sheet. There is a water circulation throughthese pipes which prevents their burning out in the fur-nace. Another design is shown in Fig. 46, in which thetubular bearing bars extend the whole length of the firebox, the water connection being such that a constant cir-culation is had. The fire-brick tiles extend across thefire box from side to side; the arch is lowest next the tube 252 COMBUSTION OF COAL. sheet, and inclines upward as it approaches the rear endof the fire box; the length of the arch and angle of incli-nation vary with the size of the fire box, but the rear endmust always be high enough properly to feed and care forthe fire. Another method of construction is to build a curvedarch across the fire box from side to side, as shown in and 69. Q. Does the brick arch cause leaky flues? This question, raised by M. D. Corbus, in LocomotiveEngineering (January, 1900), is accompanied by the state-. FlG. 46. ment that practice has demonstrated positively in somelocomotives that a brick arch in a fire box causes the fluesto leak, beginning directly after the arch is put in, and theengine does hard labor. The arches as described by himare in three pieces, placed lengthwise in the fire box andresting on four plugs screwed into the side sheets. Thebrick is cut away next the flue sheet and side sheets, toallow cinders and fine coal to drop down to the grates; FIRE-BRICK ARCHES. 253 only about 6 inches of each corner of the arch rests againstflue sheet, from 6 to 10 inches below the flues. In replying to the above, George B. Nicholson, throughthe same journal, asks: What causes flues to leak? Is itnot a too rapid expansion and contraction of the metals ofthe flue sheet and flues ? Then will a brick arch cause thisexpansion and contraction ? Suppose an engine with abrick arch to be fired up and gra
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Keywords: ., bo, bookcentury1900, bookdecade1900, booksubjectcoal, bookyear1900
