高压聚乙烯脱气料仓安全性分析和安全对策

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1、天津大学硕士学位论文高压聚乙烯脱气料仓安全性分析和安全对策姓名：孙海涛申请学位级别：硕士专业：化学工程指导教师：姚芳莲;刁春森20090201ABSTRACTHigh-pressureethylenepolymerizationtubularreactorrequiresextremelyhighpressureduringproductionprocess．Thewholeindustrialplanthasacomplicatedautomaticcontrolandlinkagesystem．Therefore，theproductionprocesshas

2、highrisks．BecauseoftheflammableethyleneinLDPEparticlesandtheelectrostaticproducedbyfi'iction,siloshavehighpotentialhazardofexplosion．Thusthesafetyofsilosisoneofthekeypointsofprocessmanagemem．Inthisarticle，thefactorsinfluencingthesafetyofsilosareanalyzed，includingtheessentialconditiomw

3、hichcanleadtoanexplosion,calculationofethyleneconcentrationandelectrostatic．ThercasoEl$forseveralaccidentsofsiloSinproductionwhichhappenedinQPEChavebeenanalyzedandexplainedindetails．Basedontheanalysismentionedabove，plansfortheimprovementofpurgingsystemhavebeenputforward,includingfourp

4、lansforimprovingtheventilationandspecificplansformodifyingthemotorofthefan,thefilterintheentranceofthefanandthedischargingvalveofthesilo．Atthesametime，plansforimprovingtheoperationprocessandfirefightingmeasuresincaseofaccidentsareputforwardtoo．Plansforimprovingtheventilationhavebeensi

5、mulatedbysoRwareCFD．Basedonthesimulationresults，theplanofaddinganextraaerationpipeattheheightof1．7mfi'omthebottomofthesiloisconsideredthebestone．Afterthisprocedurebeingimplementedinpractice，ithasbeenobservedthattheethyleneconcentrationhasloweredandthesafetydegreehasbeenraisedsignifica

6、ntly．Therefore，thisprocedureisprovedeffectiveandhasaguid啦significanceforselectingimprovingplansforindustrialplants．Atlast，severalmostinfluencingfactorsonthesafetyofsiMMsareconcludedbasedontheproductionexperienceandtheCFDsimulation．Theseconclusionsarealsousefulforthesafeproductionofoth

7、erhigh-pressureethylenepolymerizationplantsinChinaandaroundtheworld．KEYWORDS：high-pressureethylenepolymerization,purging，safetyofsilos，CFDsimulation独创性声明本人声明所呈交的学位论文是本人在导师指导下进行的研究工作和取得的研究成果，除了文中特别加以标注和致谢之处外，论文中不包含其他人已经发表或撰写过的研究成果，也不包含为获得天津大学或其他教育机构的学位或证书而使用过的材料。与我一同工作的同志对本研究所做的任何贡献均己在

8、论文中作了