. Electric railway journal . se of this paper is to call attention to someof the practices that affect the efficiency of this 2 shows in a graphical way how the energy in thecoal is consumed and what a small proportion is finallyavailable at the car. The named losses are unprevent-able, but they are all subject to decrease through in-telligent selection and operation of equipment. In one of its catalogs the Edge Moor Iron Company tOn March 1 Mr. Kelsay became superintendent of power andequipment, Cleveland, Southwestern & Columbia Railway, Elyria,Ohio. states that figuratively the
. Electric railway journal . se of this paper is to call attention to someof the practices that affect the efficiency of this 2 shows in a graphical way how the energy in thecoal is consumed and what a small proportion is finallyavailable at the car. The named losses are unprevent-able, but they are all subject to decrease through in-telligent selection and operation of equipment. In one of its catalogs the Edge Moor Iron Company tOn March 1 Mr. Kelsay became superintendent of power andequipment, Cleveland, Southwestern & Columbia Railway, Elyria,Ohio. states that figuratively the boiler is that part of thepower plant where money is burned to make an economic standpoint it is where the greatestsaving can be effected and where the greatest waste ispossible. Theefficiency of theboiler room maybe represented bythe formula: NEAT LOSS IN ASHES IOO PER CENT TOTALHEAT I. HEAT LOSS IN MOISTURE HEA TLOSS IN INCOMPLETE COMBUSTION HEAT LOSS HEAT ABSORBED y///\BY BOILER AND 7///,DELIVERED TOENGINE. FIG. 2—DIAGRAM SHOWING HOWLARGE PERCENTAGE OF HEATIN FUEL IS DISSIPATED E = SXB XO where E is the ov-er-all efficiency ofthe boiler room;S is the stokerefficiency, affectedby design of grateor stoker and fur-nace, and adap-tability of thestoker to the fuelburned; B is theboiler efficiency,including boilerand setting; andO is the operat-ing efficiency, in-cluding that ofboth firing andmaintenancelabor. In his book on Steam Power Plant EngineeringGebhardt gives the following as a heat balance for bi-tuminous coal, based on coal as fired for averagepractice: Per Cent ofCalorific Value ofCoal as Fired Heat absorbed by boiler Loss due to evaporation of free moisture in coal _ 0 6 Loss due to evaporation of water formed by combustion of hydrogen Loss due to heat carried away by dry flue gas 17 5 Loss due to carbon monoxide Loss due to combustible in ash and refuse. Loss due to heating moisture in air .3 Loss due to unconsunied hydrogen, hydrocarbo
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