. Railway mechanical engineer . how-ever, do not indicate boiler efficiency, which is affected byscale, soot and other factors. The C0„ content of gasessimply indicates the proportion of air and fuel in the productsof combustion. The accompanying chart illustrates one series of four gasanalyses for each of three different boilers taken during aperiod of eight minutes between applications of coal, showingcomparison between toilers equipped with automatically con-trolled damper, hand-controlled damper properly used, andlioiler without damper. It will be noted the preventablewaste of fuel due alo
. Railway mechanical engineer . how-ever, do not indicate boiler efficiency, which is affected byscale, soot and other factors. The C0„ content of gasessimply indicates the proportion of air and fuel in the productsof combustion. The accompanying chart illustrates one series of four gasanalyses for each of three different boilers taken during aperiod of eight minutes between applications of coal, showingcomparison between toilers equipped with automatically con-trolled damper, hand-controlled damper properly used, andlioiler without damper. It will be noted the preventablewaste of fuel due alone to improper combustion ranged fromless than 1 per cent on the boiler with automatically-controlleddamper to per cent on the boiler without damper. Basedupon a monthly consumption of 1,200 tons, this is equivalentto a loss of from 12 tons of coal per month on the one boilerto 174 tons on the other. These examples were taken atrandom from plants similar in size and are typical of resultsbeint; obtained at many 2 3 4 5 6 7 ^40. OF MINUTES AFTER FRESH FIRE FIRE WAS PERMITTED TO BURN 6 MIMUTESFOR THE SPECIAL ruRPOSE or MAKINGTESTS. DOTTED LINES iNOtCATI! TRENDOF CO2 CURVES rrR SUCCEED-ING FIRES UNDEK SAME CCH-OmONS. Effect on Flue Gas Analysis of Proper Use of Stack Damper Curve No. 1 shows the percentage of CO, as analyzed fromthe gases taken from a boiler controlled by an automaticallyoperated damper. It may be noted that one minute afterfresh coal was applied to the fire, C0„ was 15 per cent, andas this coal burned out, the percentage gradually reduceduntil at seven minutes the CO„ was per cent. Theaverage COj content for this curve is per cent, or lessthan 1 per cent preventable waste of fuel. Curve No. 2 indicates the trend of CO, readings for a likeperiod on a boiler controlled by a damper in the stack oper-ated properly by hand. The C0„ dropped from 13 per centto 7 per cent, making an average CO„ content for this curve June, 1920 K Ml,WA
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
