減溫減壓器培訓(xùn)-中文

減溫減壓器GettheValveDoctor?solution4/2/20231?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P842內(nèi)容基本概念減溫的定義減溫原理影響減溫效果的因素產(chǎn)品分類及應(yīng)用應(yīng)用中出現(xiàn)的問題BTG減溫減壓器4/2/20232?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P842什么是減溫?又稱–過熱蒸汽調(diào)節(jié)，溫度控制定義:往過熱蒸汽里注入一定量的水，使得過熱蒸汽溫度降低到某一設(shè)定值。4/2/20233?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P842

減溫基本原理減溫水經(jīng)過噴嘴后噴出分散成不同尺寸的水滴（初級霧化）水滴在蒸汽中，因蒸汽流動產(chǎn)生的空氣動力大于水分子的表面張力，水滴被進一步擊碎，形成水霧（二級霧化）水霧懸浮分散在過熱蒸汽中，吸收熱量，達到沸點經(jīng)過一段時間，水霧蒸發(fā)，從而蒸汽溫度降低4/2/20234?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P842影響減溫效果的因素減溫水與減溫后蒸汽的壓差減溫水的溫度水滴的大小進口蒸汽的流速水霧與過熱蒸汽的接觸面積蒸汽管道的尺寸減溫前后的直管段的長度4/2/20235?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P842減溫水與減溫后蒸汽的壓差4/2/20236?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P8424/2/20237?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P842水霧在下游管道不同距離處的狀態(tài)

4”downstream6”downstream

15”downstream4/2/20238?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P8421mm–20mm塵霧20mm–250mm薄霧250mm–500mm毛毛雨>500mm雨水滴尺寸試驗證明要蒸發(fā)20μ的水滴大約需要0.01秒，而要蒸發(fā)相同溫度下200μ的水滴則需要1秒。水滴尺寸與蒸發(fā)時間大約成平方關(guān)系。4/2/20239?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P842蒸汽速度在20～80m/s之間時，最有利于水滴的蒸發(fā)。最大不要超過100m/s（管道允許速度）。蒸汽速度要足夠高，以保證水滴能夠懸浮在其中，不會落到蒸汽管道內(nèi)壁，損壞管道。最小不小于10m/s。減壓后的蒸汽速度4/2/202310?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P842流動范圍（蒸汽管道直徑）4/2/202311?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P842傳統(tǒng)的文丘里噴嘴4/2/202312?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P842減溫器類型：固定噴嘴型Appliedinlarge&smallmassflowsystemsNozzlesaredesignedtobreakstreamsintosmalldropletsLinersareoftenusedbecauseofdirectedwaterjetsFixedorifice,rangeabiltiyislimitedtobetween5:1&15:14/2/202313?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P842減溫器類型:可變截流孔Appliedinlarge&smallmassflowsystemsHighvelocityflowgeneratedaroundplugWaterispulledthroughchannelsbylocalpressurechange4/2/202314?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P842減溫器類型：插入式多噴嘴式Appliedinmediumtosmallmassflowsystems,butmultiplevalvescanbeusedforlargesystemsNozzlesbreakstreamsintosmalldropletsforfineatomizationLinersarenotusedbecauseoffineatomizationNozzlesareserviceableNozzlescantakehigherpressurethansprayringRangeabiltiyexceeds50:1withmultiprobes4/2/202315?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P842SHsteamDSsteamAtomizing

steamH2O蒸汽輔助型減溫器SteamjetatomizeswaterintofinedropletsforquickerevaporationHighdesuperheatingrangeability,50:1–SpraywatervalvebecomeslimitingfactorRequiresexternalwaterspray&steamvalves4/2/202316?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P842蒸汽輔助型減溫器4/2/202317?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P842減溫器類型：彈簧加載型噴嘴(SLSN)4/2/202318?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P842中心插入式SLSNVariableorificenozzleforbestprimaryatomizationEasyinstallationintosteamlinesSpraynozzlescreatebackpressuretospraywatervalveOver-travelnozzlesforpassingcontaminationHighRangeabilitybetween30:1and50:1–spraywatervalvebecomeslimitingfactorDA-O4/2/202319?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P842多個彈簧加載型噴嘴帶有內(nèi)襯，增加蒸汽流速，同時保護管道內(nèi)壁DA-M4/2/202320?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P842DAM-DVariableareanozzleDesuperheatingafterpressurereductionNozzlesconfiguredtogiveevencrosssectiondistributionWaterinjectionathighvelocity&turbulencepointsinsteamflowSteamflowactsasthermalshieldQuickchangenozzleassy4/2/202321?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P842不同噴嘴水滴尺寸BTG彈簧背壓式噴嘴100mm–250mm多噴嘴>

700mm固定噴嘴>1～2mm4/2/202322?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P842精確的溫度控制精確的壓力控制低噪音低振動高可靠性低維修成本可調(diào)范圍廣嚴密關(guān)斷控制簡單良好的蒸汽調(diào)節(jié)系統(tǒng)?4/2/202323?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P842常遇到的問題:閥桿彎曲變形4/2/202324?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P842常遇到的問題:噪音大4/2/202325?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P842熱應(yīng)力4/2/202326?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P842噴水閥的閥芯閥座4/2/202327?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P842多孔噴頭:現(xiàn)場故障溫度擺動開裂啟動時沒有調(diào)節(jié)脫落部件損壞下游的流量計積水多工作溫度在設(shè)定點以下4/2/202328?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P842引起這些問題的原因?高壓差熱應(yīng)力霧化效果差MainboilerfeedpumpStresscalculationsDropletformation4/2/202329?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P842高壓降>140Bar

壓差閥內(nèi)流速很高侵蝕泄漏–拉絲現(xiàn)象普通的單座套筒閥=失效4/2/202330?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P842熱應(yīng)力熱循環(huán)溫度超過300°C時很高的熱應(yīng)力裂化/粘滯材料選擇材料膨脹系數(shù)高溫下的強度4/2/202331?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P842霧化效果噴水–水霧–蒸發(fā)沒有完全蒸發(fā)的水滴會導(dǎo)致:溫度控制效果不理想損壞管道積水問題高溫管道淬火4/2/202332?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P842DRAG?velocitycontroltrimLownoiseLowvibrationTightshutoff,MSS-SP61DiffuserforflowconditioningbeforedesuperheatingMultipleSLSN,wallmountedforgoodsecondaryatomizationBTG減溫減壓閥:CCIDRAG?+DAM-D4/2/202333?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P842BTG舊型號VLB螺栓螺母式閥蓋閥桿閥芯通過螺紋連接閥座靠套筒壓緊在閥體上，直接受到高速蒸汽的沖刷調(diào)節(jié)套筒通過墊圈上下固定，高溫下沒有收縮的余地多處填料密封（8），增加泄漏點SeatControlsleeve4/2/202334?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P842BTG減溫減壓閥:VLB延長導(dǎo)向閥桿頂裝式，壓力自密封一體鍛造流線型閥體彈性閥座只有兩個區(qū)域需要填料密封，大大減少了泄漏點4/2/202335?2006.CCI–ControlComponentsInc.CCIistheValveDoctor?.Allrightsreserved.P842VLB噴嘴排布彈簧背壓噴嘴噴水水滴小，均勻優(yōu)化調(diào)節(jié)比有效防止氣蝕噴嘴易于維修4/2/202336?2006.CCI–ControlCompon