. Factory and industrial management. BENNIS STOKER PLANT FITTED TO EIGHT WATER-TUBE BOILERS AT A SUGAR FACTORYNEAR BARCELONA^ SPAIN. Bennis Lancashire Stoker Works, Bolton. It has been maintained that the most economical rate for boileroperation is that of an evaporation of 4 pounds of steam per hour persquare foot of heating surface, and certain boiler tests may be cited toshow this. Other tests, however, show that the evaporation persquare foot of heating surface may vary while the steam economy ECONOMY OF MECHANICAL STOKING. 725 remains constant. Thus six tests on an internally-fired multit
. Factory and industrial management. BENNIS STOKER PLANT FITTED TO EIGHT WATER-TUBE BOILERS AT A SUGAR FACTORYNEAR BARCELONA^ SPAIN. Bennis Lancashire Stoker Works, Bolton. It has been maintained that the most economical rate for boileroperation is that of an evaporation of 4 pounds of steam per hour persquare foot of heating surface, and certain boiler tests may be cited toshow this. Other tests, however, show that the evaporation persquare foot of heating surface may vary while the steam economy ECONOMY OF MECHANICAL STOKING. 725 remains constant. Thus six tests on an internally-fired multitubu-lar boiler with corrugated firebox, with ordinary hand firing, showthat at rates of combustion varying from 21 to 32 pounds of coal persquare foot of grate per hour, the equivalent evaporation from and at. PRULluK > >HUVEL STUKEK APPLIED TO FOUR EIGHT-FOOT LANCASHIRE BOILERS, NEWHYDRAULIC STATION OF NORTHEASTERN RAILWAY, MIDDLESBORO. The stokers are fitted with a complete coal-handling plant, delivering coal automatically tothe stoker hoppers by elevators and conveyors. Proctor, Burnley, Lanes. 212 degrees F. per pound of combustible remained constant, whilethe rate of evaporation per square foot of heating surface varied from3 to 4 pounds. The completeness of combustion can be told best by the tempera-ture of the escaping gases and by an analysis of their chemical composi-tion. Thus for excellent combustion the temperature of the dis-charged gases should not be higher than 400 to 500 degrees F. If thepercentage of oxygen is to 2 per cent., it indicates that the firesare too thick and the rate of combustion too high for the draft em-ployed. If the oxygen exceeds 8 per cent., the fires are too thin, thedraft too heavy, or too much cold air is entering the furnace abovethe fire.
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