外文翻译-安全工程专业中英文文献翻译

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1、外文翻译-安全工程专业中英文文献翻译翻译部份英文原文SpontaneouscombustionofcoalCoalundergoesslowoxidationonexposuretoairatambienttemperatures,withtheevolutionofheat,gasesandmoisture,theheatgenerated,ifnotdissipated,givesrisetoanincreaseinthetemperatureofthecoal.Asthetemperatureofth

2、ecoalrises,therateofoxidationincreases.Ifthisisallowedtoproceeduncheckeditcaneventuallyresultintheignitionofthecoal.Thisoxidationprocessisknownasspontaneouscombustionorspontaneonsheatingorself-heating.Self-heating,therefore,occurswhentherateofheatgeneratio

3、nexceedstherateofoxidation.Duringrecentyearstherehasbeenarenewedinterestinthespontaneouscombustionofcoalinallcoalminingcountriesparticularlybecauseoftheuseofcavingmethodsandthethickerseamsbeingmined.Large-scalebulkstorageandbulktransportofcoalhavealsobecom

4、emoreimportantwiththeincreaseincoaltrade.EvaluationofthepotentialofcoalforspontaneouscombustionSeveralmethodshavebeenusedtoevaluatethepotentialofcoalforspontaneouscombustionbutnoneisclearlysuperior.Themostcommonmethodsusedaredescribedblow.OxygenabsorptionI

5、nthismethod,acoalsampleisplacedinacontainerandoxygenorairisaddedtoit.Theamountofoxygenabsorbedbythecoalisestimatedfromtheanalysisofthegaseousreactionproducts.Thetemperatureincreaseperunitofoxygenconsumedindicatespotentialofcoalforspontaneouscombustion.Hcat

6、ingrate/crossing-pointtemperatureInthismethod,acoalsampleisplacedinabathandheatedataconstantrate.Initially,thetemperatureofthecoallagsbehindthetemperatureofthebathbutascoalbeginstoself-heat,thetemperatureofthecoalfirstcoincideswithandthenexceedsthetemperat

7、ureofthebath.Thecrossing-pointtemperatureisknownasthe^relativeignitiontemperature".Usually,thecrossing?pointtemperatureisusedasameasureofthepotentialofcoalforspontaneouscombustionalthoughtheindexbasedontheratioofheatingratetocrossing-pointtemperatureismore

8、suitablebecausethespontaneouscombustionpotentialofcoalnotonlydependsontheignitiontcmpcraturebutalsoontherateofheatgeneration.AdiabaticcalorimetryInthismethod,acoalsampleisplacedinaninsulatedbath,andthewholesy