Heat engineering; a text book of applied thermodynamics for engineers and students in technical schools . of the R. D. Wood Co. of a metal cylinder filled with coke and cooled by water. Thegas enters a water seal at the bottom of the scrubber and leavesat the top. From this point the gas may be taken to a tarextractor if the gas contains tar to any extent. This is practi-cally a centrifugal fan over which the gas passes, being thrown tothe outer edge and thus causing the heavier tar to be caught bythe casing. From this point it is taken to the gas holder. INTERNAL COMBUSTION ENGINES 373 In Fig
Heat engineering; a text book of applied thermodynamics for engineers and students in technical schools . of the R. D. Wood Co. of a metal cylinder filled with coke and cooled by water. Thegas enters a water seal at the bottom of the scrubber and leavesat the top. From this point the gas may be taken to a tarextractor if the gas contains tar to any extent. This is practi-cally a centrifugal fan over which the gas passes, being thrown tothe outer edge and thus causing the heavier tar to be caught bythe casing. From this point it is taken to the gas holder. INTERNAL COMBUSTION ENGINES 373 In Fig. 182 the Otto Suction Gas Producer is shown. Inthis a suction is produced by the engine drawing in gas. Thisdraws air from the atmosphere at A over the hot water in thetop of the producer at B and thence through the pipe R to thebottom of the fuel bed C. The water is heated by the gas passingfrom the producer. It then passes through the down pipe Dto the seal box, depositing tar or dirt at the bottom and passingup through the scrubber E; it finally enters the receiver F andthen passes to the Fig. 182.—Suction producer of the Otto Gas Engine Co. The blower G is used in starting the fire in the producer. Thethree-way cock H is used to direct the gases and smoke to thechimney before burnable gas is produced in starting a fire. Thescrubber E is filled with coke over which water trickles andthrough which the gas passes. The spherical charging ballat the hopper mouth prevents gas discharging or air entering. An analysis of producer gas from soft coal gave the following: 374 HEAT ENGINEERING Carbon monoxide, CO Hydrogen, H2 Carbon dioxide, C02 Oxygen, 02 . Ethylene, C2H4 Methane, CH4 Nitrogen, N2 This gas gave per cubic foot under standardconditions. Since 1900 blast-furnace gas has been used it was first used in England in 1895 on a 12 X 30 — gas engine and in the same year on an en
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