lesson--5Fuel-oil-system轮机英语阅读.pptx

Lesson5

FUELOILSYSTEM

;1.Marineenginesmustoperatesuccessfullyonheavyfueloilswhichmayvary(变化）inquality（质量）andanalysis(成分，分析）dependinguponthesource（来源）oftheircrudeoil（原油）andtherefinery（冶炼）processes.;2、Accurate（精确的）andcomplete（彻底的，全部的）analysis(成分）aredifficulttoobtain（达到，获得）butspecifications（规范，说明）shouldconfirm（确认，确定）thatcertainparameters（参数）arenotexceeded（超过）.Samples（样品）oftheoildelivered（送）shouldbekeptforreference（参考，参照）.

;;4.Viscosity（黏度）isrequired,tocalculate（计算）temperaturesatwhichthefuelistreated（处理）andinjected（喷射）intotheengine.;;;;7.Thefueloilsystem（燃油系统）foradieselenginecanbeconsideredintwoparts-thefuelsupply（供油）andthefuelinjection（燃油喷射）systems.Fuelsupplydealswiththeprovisionofthefueloilsuitableforusebytheinjectionsystem。

主机的燃油系统可分为两部分—供油系统和燃油喷射系统.燃油供应提供适合于喷射系统的燃油。;;;;9.Fromtheservicetanks（日用柜）thetreated（处理过）oilispumpedthroughapressurizedfuelsystem（压力燃油系统）totheengine.

;;;;Theoilfirstpassestothesupplypumpwhichraisesitspressuretoabout4bar;thispressureismaintainedinthecirculatingreturns.

燃油首先经过供给泵加压使其压力达到约4bar,这个压力在循环回路里被维持。

;Thecirculating（循环）orbooster（增压）pumpdrawsoilfromtheprimary（初级的）discharge,raisingitspressureto10-12baranddeliveringitthroughtheheater,viscosityregulatorandfinefiltertothemainenginefuelpumps.

循环泵或者增压泵从第一级出口吸入油，把压力加至10-12bar，通过加热器、黏度控制器和细滤器最终传至主机燃油泵。;;;;;;;;andmustincludeatimingmechanismtoensurethatdeliveryofthisfuelcommenced（开始）atthecorrectmoment,andmusthaveameanstoatomizethefuel。

同时必须包含一个定时机构从而确保燃油供应在正确的时刻开始，并且有一定的方式雾化燃油。;;;;;15.Theengineisalsoprovidedwithagovernor（调速器）whichisdesignedtoregulate（调节）theengine’sspeedbyadjustingthequantityofoilinjected.Whentheenginerunsataspeedhigherorlowerthanisset,thegovernorwillactautomaticallyandreduceorincreasethefueloilsupplysothattheenginespeedca