船舶微过热蒸汽发生系统供汽性能研究.pdf

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1、第38卷第4期舰船科学技术Vol.38,No.42016年4月SHIPSCIENCEANDTECHNOLOGYApr.,2016船舶微过热蒸汽发生系统供汽性能研究杨元龙(中国舰船研究设计中心，湖北武汉430064)摘要:为提高船舶微过热蒸汽发生系统的稳定性和优化微过热系统性能参数，探析稳态、动态工况下微过热蒸汽发生系统供汽响应特性。本文以船舶微过热蒸汽发生系统为机理模型，采用CFD模拟方法计算了微过热蒸汽发生系统速度场、压力场和温度场的稳态分布规律，引入实际微过热蒸汽系统运行参数作为边界条件，开展微过热蒸汽发生系统供汽性能动态研究，得到过热蒸汽掺混流量、饱和蒸汽掺混流量、微过热蒸汽压力和温

2、度等关键性能参数的动态变化规律，并提出微过热蒸汽掺混因子，定量表征微过热蒸汽系统掺混特性及其对蒸汽温度影响规律。计算结果显示，在微过热蒸汽供汽过程中，饱和蒸汽系统管路压降大于过热蒸汽压降，微过热蒸汽压力不断降低，过热蒸汽和饱和蒸汽掺混流量增大，促使蒸汽掺混因子减小，导致微过热蒸汽温度略有降低。基于微过热供汽性能参数的分析，说明船舶微过热蒸汽发生系统供汽响应方案满足用汽设备的要求，可用于船舶蒸汽动力系统的设计。关键词：微过热蒸汽；供汽性能；CFD中图分类号：U664.5文献标识码：A文章编号：1672–7619(2016)04–0066–05doi：10.3404/j.issn.1672–7

3、619.2016.04.014Researchonsteam-supplyperformanceofshipmicro-superheatedsteamgeneratingsystemYANGYuan-long(ChinaShipDevelopmentandDesignCenter,Wuhan430064,China)Abstract:Inordertoimproveshipmicro-superheatedsteamgeneratingsystemstabilityandoptimizeitsperformanceparameters,themicro-superheatedsteamg

4、eneratingsystemsteam-supplyresponsecharacteristicunderthesteadyandtransientstatewillbecleared.Theshipmicro-superheatedsteamgeneratingsystemwastakenasthemechanismmodelherein.Thesteadycharacteristicsofvelocitypressure,andtemperaturefieldformicro-superheatedsteamgeneratingsystemwerecalculatedbymethod

5、ofCFDsimulation.Theboundaryconditionswereintroducedtotreatasactualoperatingparametersofthissystem.Thedynamicsimulationstudyonmicro-superheatedsteamgeneratingsystemsteam-supplyresponsecharacteristicwascarriedout.Thekeyparametersdistributionsofsaturatedandsuperheatedsteammixingmassflow,micro-superhe

6、atedsteampressureandtemperaturewereobtained.Meanwhile,themicro-superheatedsteammixingfactorwasproposed,whichcouldexpressquantificationallymicro-superheatedsteamgeneratingsystemmixingcharacteristicsandeffectsofmicro-superheatedsteamtemperature.Thecalculatedresultsshowedthatthepressuredropofsaturate

7、dsteamwashigherthanoneofsuperheatedsteam.Themicro-superheatedsteampressurereducedgradually,leadingtolargersaturatedandsuperheatedsteammassflow.Thesecausedmicro-superheatedsteammixingfactortoreduce,whichresultedin