. The Street railway journal . rse proportion. Itcombines this featurewith the conservationof the sensible heat ofgases leaving the pro-ducer. By this meanssteam is generated at arate proportional to thedemand for gas withoutrequiring extra boilerequipment or fuel. Thislargely increases theproducer efficiency. Insome types of-producerwe recall that the fuelfor steam amounts to asmuch as 15 per cent to20 per cent of the totalcoal gasified. This producer is de-signed for use withouta gas holder and hasbeen successful in thisparticular. The espe-cially severe conditionsof heavy railway work,howev
. The Street railway journal . rse proportion. Itcombines this featurewith the conservationof the sensible heat ofgases leaving the pro-ducer. By this meanssteam is generated at arate proportional to thedemand for gas withoutrequiring extra boilerequipment or fuel. Thislargely increases theproducer efficiency. Insome types of-producerwe recall that the fuelfor steam amounts to asmuch as 15 per cent to20 per cent of the totalcoal gasified. This producer is de-signed for use withouta gas holder and hasbeen successful in thisparticular. The espe-cially severe conditionsof heavy railway work,however, prescribesstorage capacity atsome part of the sys-tem. Owing to the lim-itations of gas-engine capacity, dealt with in the preceding paper, electric • storage isevidently the most desirable, as it relieves the machinery of thewear and tear of fluctuating loads. There is ample precedent the LOSSES Standby losses in a steam power plant are an important sourceof inefficiency and difficult to determine accurately. Mr. Dowson. 60 70Load Fhcfor • FIG. 11.—RECORD OF COMPARATIVE OBSERVATIONS BETWEEN STEAM AND GAS AT GUERNSEY, ENG. has made some comparative observations* with eight steam plantsand several producer plants, averaging about 250-hp capacity. Theactual standby fuel consumption of the boilers was 35-180 lbs. per hour, and of the producers 2-4 hour. Whether the exact ratioholds for larger plants is do know that the producer lossesare almost inconsiderable, which is rea-sonable, owing to the great heat con-tent of the fuel bed and small oppor-tunity for loss of heat by radiationwhen the producer is shut off from theatmosphere. Running losses are evi-dently also much less. We may pipegas for great distances with small so with highly superheated steamunder high pressure. When a gas en-gine plant is shut down the losses prac-tically cease; with steam, condensationis uninterrupted. LABOR The comparative cost of labor andsupplies for gas and
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
