. Pacific Gas and Electric magazine. er, and are enclosed in an iron casewith inlet and outlet pipes on opposite sides. Exhausters are usually operated by steamengines, either direct connected or belt many gas works the exhauster is locatedbeyond the condensor, but when it is so placedit requires so much lubrication that it becomesa source of trouble. When it is placedbetween the hydraulic main and the conden-ser it requires no internal lubrication, and ifallowance is made in the construction of theexhauster for expansion, due to pumping hotgas, it works most satisfactorily. The ex-h
. Pacific Gas and Electric magazine. er, and are enclosed in an iron casewith inlet and outlet pipes on opposite sides. Exhausters are usually operated by steamengines, either direct connected or belt many gas works the exhauster is locatedbeyond the condensor, but when it is so placedit requires so much lubrication that it becomesa source of trouble. When it is placedbetween the hydraulic main and the conden-ser it requires no internal lubrication, and ifallowance is made in the construction of theexhauster for expansion, due to pumping hotgas, it works most satisfactorily. The ex-hauster at this point also performs a certainamount of mechanical scrubbing by break-ing up and depositing tar globules. Another 390 1£ Purification of Coal Qas I iut E and perhaps the best reason for placing theexhauster immediately after the hydraulicmain is that all condensing and scrubbingapparatus is operated under pressure. Ex-perience teaches that it is better that gas shallleak out of such apparatus than to have airdrawn Early Form of Multitubular Condenser for Coal Gas. The function of gas condensers is to gradu-ally, and without shock, reduce the temper-ature of gas to nearly the local normaltemperature of the air. In thinking of gas itmust not be considered as a fixed chemicalsubstance, but as a physical mixture of gasesof different densities. At the hydraulic mainevery part of the coal, excepting the coke, isin the form of gas heavily charged with waterand hydrocarbon vapor. Some of thesevapors are deposited in the hydraulic main;and the foul main encircling the retort house,and more of them in the condenser, and theamount of volatile hydrocarbon deposited orremaining in the gas is simply a question ofvapor tension due to temperature. The vapor tension increases with a rise oftemperature and decreases with a fall of tem-perature. The treatment of the gas in thecondenser and scrubber should therefore besuch that the gas will become stable, and re-tain its illumi
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Keywords: ., bookauthorpacificgasandelectric, bookcentury1900, bookdecade1900
