Suction gas plants . therefore, mustdepend on the degree of perfectness with which the heatabstracted in the latter portion of the action is transferred tothat part of the producer where it is required. This aimed-forresult has been more or less realised in many devices. In thesecond diagram the incoming air and water take up the heatfrom the hot fuel and gases by radiation. This transference ofheat is represented by the band representing steam and air beingwrapped round the producer. It should be stated that at thisstage of the proceedings, for every pound of carbon we have4^ lbs. of air and
Suction gas plants . therefore, mustdepend on the degree of perfectness with which the heatabstracted in the latter portion of the action is transferred tothat part of the producer where it is required. This aimed-forresult has been more or less realised in many devices. In thesecond diagram the incoming air and water take up the heatfrom the hot fuel and gases by radiation. This transference ofheat is represented by the band representing steam and air beingwrapped round the producer. It should be stated that at thisstage of the proceedings, for every pound of carbon we have4^ lbs. of air and about OSi lb. of water. Now, the abovechemical reactions take place, and the air and the absorbedmoisture become transformed, after having been passed through INTRODUCTORY MATTER. 13 the fire. We now have a gas which contains roughly 29 lbs. ofcarbon monoxide, IJ lbs. of hydrogen, ^ lb. of methane, 57 nitrogen, and 12 lbs. of carbon dioxide in every 100 lbs. 0-B4/OperlbofC. Air4-5 ID per lb oFC Gas KiG. 6.—Diagiam showing Volume and Weight of Gases passingthrough the Producer. of gas. But owing to the high temperature, the volume of thegas per pound at this stage is very high, and consequently ifwe take it direct to the engine cylinder, we should requirea very large cylinder indeed to do the work as compared withthat necessary if we cool the gas down. The gas is therefore 14 SUCTION GAS PLANTS. passed up the cooling and cleaning tower, generally called theScrubber. It will be noticed that at present the heat abstracted from thegases in the scrubber is not made use of. There is also anenormous waste of heat in exhaust gases and water of the engine,and. it would appear that we may expect some improvementsfrom the regenerative system in this direction. The difficultyis to make sure that the plant is not too complicated. To findout how far we may go in this direction, we will now consider thepractical details of a suction plant, and endeavour to show theprinci
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