Suction gas plants . uel is less, or its heating value is , a good deal of heat is carried off by the gas and lost inthe cleaning apparatus. Lastly, the reactions which actuallyobtain are not in accordance with those theoretically assumed;consequently there is a drop in the efficiency of the plant. Thethird source of loss is, in practice, partially neutralised by utilisingsome of the sensible heat of the gases for the purpose of raisingsteam in the evaporator, and also in some cases for pre-heatingthe air supply. It is not intended to deal fully with the chemical calculations
Suction gas plants . uel is less, or its heating value is , a good deal of heat is carried off by the gas and lost inthe cleaning apparatus. Lastly, the reactions which actuallyobtain are not in accordance with those theoretically assumed;consequently there is a drop in the efficiency of the plant. Thethird source of loss is, in practice, partially neutralised by utilisingsome of the sensible heat of the gases for the purpose of raisingsteam in the evaporator, and also in some cases for pre-heatingthe air supply. It is not intended to deal fully with the chemical calculationsnecessary for thoroughly understanding the production of suctiongas producers. They are somewhat complex, and, after all, verymuch the same whatever the type of gas producer. It isabsolutely necessary to master them in order to understand thedirections in which progress may be made, but I feel that ourobject is rather to understand what we now have, than to attemptto foreshadow what we may get. 10 SUCTION GAS /I ^ \ ^ l\ qI IV ^1* a w i sm o 3 uj c; Dalbys Diagrams. —Perhaps the mostuseful object served bythe Eoyal AgriculturalSociety of Great Britainwas the competitionof suction gas plantsat Derby. CaptainSankey and ProfessorDalby were the twojudges. The latterread a most excellentpaper for the BritishAssociation at York,and by means of someclever diagrams heshowed clearly how theheat problem of suctiongas producers may bebrought to miud. Inthe first diagram theproducer is consideredto be stretched out ina straight line, thevariations in thevolume occupied bythe gas being repre-sented by the differentwidths of the diagram(fig. 4). Air and waterare drawn into the pro-ducer on the suctionstroke of the engine,but in order to fitthem for work in theproducer, the air mustbe heated and thewater vaporised. To INTRODUCTORY MATTBR. 11 carry this out, heat must be supplied. This influx of heat is
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