. Transactions. lies for most blast-furnace gas between2,450 and 2,500°F. for cold gas, and between and per cent, higherfor hot gas of a temperature of 200 to 600°F. It must be the aim of thegas engineer to get as near as possible to these theoretical combustion K, HUESSENER 411 temperatures. If the combustion temperatures are right, the rear tem-peratures will take care of themselves. It is an accepted rule that for <u 40 wSso a h00 a 40 3 30 »20 •J 10 . ^25% to in B. F. Gas 30% C I 0 Loss in Sensible Heat--^ ^ ^ . G*V ^ ,^^ S^ If toth CO & 0 are PresentReduce to an Oxygen Free Ba
. Transactions. lies for most blast-furnace gas between2,450 and 2,500°F. for cold gas, and between and per cent, higherfor hot gas of a temperature of 200 to 600°F. It must be the aim of thegas engineer to get as near as possible to these theoretical combustion K, HUESSENER 411 temperatures. If the combustion temperatures are right, the rear tem-peratures will take care of themselves. It is an accepted rule that for <u 40 wSso a h00 a 40 3 30 »20 •J 10 . ^25% to in B. F. Gas 30% C I 0 Loss in Sensible Heat--^ ^ ^ . G*V ^ ,^^ S^ If toth CO & 0 are PresentReduce to an Oxygen Free Basisby means of Curve Fig. 7 ^ i^^^^ ^ Loss 0^°in Unc( Dsutne( CO ^ «0133 4 56 7 8 910 11 12 13 Per Cent CO in Products with no Oxygien Present Fig. 6.—^Losses through Incomplete Combustion. any given gas (provided the same quantities of gas are passed in a giventime unit) the rear temperature will always be in an inverse relation to thecombustion temperature. This will show at once the importance of. 01234 667 PeJT Oeat Oxygen of Infiltration In Products containing botlx CO and O Fig. 7.—Factors for Correcting Analyses. combustion with a low excess of air as a large excess will not only increasethe volume but also the temperature of the waste gas. All this ispredicated on otherwise faultless boiler conditions. 412 DEVELOPMENT IN THE COMBUSTION OF BLAST-FURNACE GAS Fig. 6 shows in what manner the efficiencies are affected by un-burned CO, giving the losses of both sensible and latent heat throughincomplete combustion, for gases containing 25 and 30 per cent. COwith 0 to 13 per cent. CO in the waste gas, without excess of air. If the analysis of the waste gas shows excess of oxygen in spite of theunburned CO, both CO2 and CO must be multiplied by a certain factorwhich depends on the amount of oxygen in the waste gas. Fig. 7 givesthese factors for amounts of oxjgen varjdng from 0 to 7 per cent. Example: the analysis of waste gas is N2 CO2 CO O2 Per
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
