除雾器冲洗系统程序中文版

1Washingprocedure冲洗程序1.Designofwashingprocedure冲洗程序的设计TheobjectiveofRPT’swashingscheduleistomaintainacleanandopenmisteliminatorandtoassurelowpressuredropaswellasundisturbedoperationoftheFGDandthepowerplant.RPT公司的冲洗程序是为了保证除雾器清洁可靠从而确保较低的压降，保证脱硫系统和电厂的运行正常。Theexperienceshowsthatafrequentwashingofthemisteliminatorwithahighquantityofwashwater–inparticularofthecoarsemisteliminator–protectsthemisteliminatorfromcloggingandavoidshighpressuredropandlongoperationcycles.根据经验显示频繁地冲洗除雾器需要大量的冲洗水，特别是第一级除雾器，防止除雾器堵塞避免产生高压降和长时间运行循环。Accordingly,thedesignproposalforthewashingscheduleisdirectedatusingahighquantityofwashwaterforthisreason.Smallerwashwaterquantitiesarepossible–ifneededthisshouldbediscussedindetail.因此冲洗程序的设计直接就是采用大量的冲洗水就是这个原因，少量的冲洗水是有可能的，如果需要可以再详细讨论。2.Dimensioningofpumpandsystem泵和系统的尺寸InitsquotationRPTprovidesthekeyparametersforthedimensioningofthewashingsystemwhichconsistsofpumpdimensioning,numberofvalvesperlevelandwashwaterquantity(table1–anexample).Additionaldetailisprovidedinthetechnicaldatasheets.RPT提供冲洗系统定尺寸的关键参数包括泵的尺寸，每层的阀门数量和冲洗水的数量（图1－例子）附加详细的技术参数Coarsemisteliminator:frontrear第一级除雾器前后spraylevels（冲洗层数）11valvesperlevel（每层的阀门数）88waterconsumption(m³/h)（水耗量）25.525.5Finemisteliminatorfront第二级除雾器spraylevels（冲洗层数）1valvesperlevel（每层的阀门数）8waterconsumption(m³/h)（水耗量）17REAPLASTIKTECH（ASIA）CO.,LIMITED地址：7/FKinOnCommBldg49-51JervoisStSheungWanHK香港上环苏杭街49－51建安商业大厦7楼全层HongKong,China2pressureatflange(bar,g)（表压）2.0minpumpcapacity(m³/h)（最小泵容量）173Table1Thedimensioningofthepumpconsidersthemaximuminstantaneousflow.Thisistheflowwhichisgeneratedbywashingthesectionwiththelargestsurface.Thisisusuallythemiddlerowofmisteliminatormodules.泵的尺寸考虑的是最大的瞬时流量，这是冲洗最大面积产生的流量，一般都是除雾器中间的组件。Thedesignruleisthatthesurfaceshouldbewashedwithabout60l/m²min.Incaseoftheroofdesignitmustbeconsideredthatthemisteliminatoristiltedwith35°.Theeffectivesurfaceat35°isabout120%ofthesurfaceinthehorizontalplane.Accordinglythedesignquantityis73l/m²minforthesurfaceinthehorizontalplane.设计的原则是表面要用流速60l/m²min的水冲洗，因为屋顶式除雾器的设计必须保证除雾器有35°的倾斜，而35°的倾斜的有效面积相当于120%的水平面积，因此实际的水平表面流速是73l/m²min。3.Washingschedule冲洗程序InthequotationRPTprovidestheproposedscheduleforthe100%loadofthepowerplant(table2–anexample).在100％的电厂运行工况下（表2－例如）RPT提供的建议冲洗程序：Operationofwashingsystem冲洗系统的运行Therecommendedwashingprocessisasfollows:推荐冲洗程序如下：Firststage-front:60s/40min第一级前-rear:60s/40min后Secondstage-front:60s/60min第二级前Table2Themeaningof60s/40minutesisthateachvalveinthiswashinglevelshouldbeopenedfor60secondsevery40minutes.60s/40minutes的意思是每一层冲洗系统的每一个阀门需要间隔40分钟开启60秒。REAPLASTIKTECH（ASIA）CO.,LIMITED地址：7/FKinOnCommBldg49-51JervoisStSheungWanHK香港上环苏杭街49－51建安商业大厦7楼全层HongKong,China3ThewashingscheduleofanexampleFGDisshowninFigures1,2,and3.Figure1showsthescheduleofthevalvesofonelevelforonewashingsequence.Thewashingintervalisdefinedwith10minutesandeachvalveopensfor60seconds.Itshouldbeconsideredthateachvalverequiresafewsecondstoopenandafewsecondstoclose.Thesupplierofthevalvewillprovidethetimerequiredforopeningandclosing.Figures2and3showtwoalternativeoverallwashingschedulesforanexampleswithsevenvalves–operatingat100%load.Forscheduleswithmoreorlessvalvespleaseseeappendix.表1,2,3是脱硫系统冲洗程序的例子，表1显示的是冲洗顺序需要的一层阀门的动作顺序，冲洗的时间设定成10分钟，而每一个阀门开启的时间是60秒，这说明每一个阀门需要几秒钟去开和关，阀门厂家需要提供阀门开关的时间。表2和表3显示的是在100％的负荷情况下，整个冲洗过程7个阀门都启动的两个选择，更多或更少的阀门可以参考附件。8910Time[min]Valve701234567Valve5Valve6Valve3Valve4Valve1Valve2Figure1Figure2Figure34.Loaddependentwashing冲洗和载荷的关系Thedifferentloadsituationsusuallyrequireareductionofwashwaterusageatlowerloads.ThereforeRPThasdesignedthefollowingstandardscheduletoshowthedesign(table3–120130levelthird8090100180140150160170110010203040506070firstsecondlevelfirstsecondthird0102030100110405060701601201301401508090REAPLASTIKTECH（ASIA）CO.,LIMITED地址：7/FKinOnCommBldg49-51JervoisStSheungWanHK香港上环苏杭街49－51建安商业大厦7楼全层HongKong,China4anexample).在低负荷的工况下，冲洗水量常常减少，因此RPT给出在不同负荷下设计的水量Load负荷100%75%50%35%25%sequencefirst第一次顺序60s/40min60s/60min60s/90min50s/90min50s/90minquantityfirst第一次流量17,5m³11,7m³8,8m³7,3m³7,3m³sequencesecond第二次60s/40min60s/60min60s/90min50s/90min50s/90minquantitysecond第二次流量17,5m³11,7m³8,8m³7,3m³7,3m³sequencethird第三次60s/60min60s/60min60s/90min50s/90min50s/90minquantitythird第三次流量11,7m³11,7m³8,8m³7,3m³7,3m³Total46,8m³35,1m³26,3m³21,9m³21,9m³Table3Therearetworuleswhichshouldbeobserved:有两个原则要注意1.Durationofonesprayinginterval一次冲洗的间隔时间Theintervalshouldbenotlessthan40secondsideallynotlessthan50seconds.Thefirst4–7secondsthepipingsystemfillsupandanother1–2secondsthesprayconebuildsup.Duringthistimethespraysystemisnoteffectiveatall.冲洗的间隔不少于40秒，最理想是不少于50秒，在最开始的4－7秒管子系统充满水另外的1－2秒冲洗喷嘴开始工作，在这段时间里冲洗系统根本没有任何作用。Thenthespraysystemmustbringsufficientwashwateronthesurfacetodissolvethesolidssittingthereaswellastogeneratealiquidmasswhichhassufficientviscositytorinseaway.Itisnotsufficienttowetthefoulingbuttheremustbesufficientwatertogenerateasmallstreamofliquidrinsingaway.冲洗系统必须有足够的冲洗水溶解表面上的固体，并且生成具有一定粘性的液流可以冲走，把污垢弄湿是不够的必须要有足够的水来产生液流并且能被冲走。REAPLASTIKTECH（ASIA）CO.,LIMITED地址：7/FKinOnCommBldg49-51JervoisStSheungWanHK香港上环苏杭街49－51建安商业大厦7楼全层HongK