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1、分類號:密級:UDC:編號:河北工業(yè)大學(xué)碩士學(xué)位論文某大型供熱管網(wǎng)水力工況分析及性能預(yù)測研究論文作者:池可人學(xué)生類別:全日制學(xué)科門類:工學(xué)碩士學(xué)科專業(yè):供熱、供燃?xì)?、通風(fēng)及空調(diào)工程指導(dǎo)教師:楊華職稱:教授DissertationSubmittedtoHebeiUniversityofTechnologyforTheMasterDegreeofHeating,GasSupply,VentilatingandAirConditioningEngineeringHYDRAULICCONDITIONANALYSISANDPERFORMANCEPREDICTIONRESEA
2、RCHONLARGEHEATSUPPLYNETWORKbyChiKerenSupervisor:Prof.YangHuaDecember2014摘要隨著我國集中供熱管網(wǎng)逐漸向大型化的發(fā)展,管網(wǎng)水力失調(diào)現(xiàn)象日益突顯,同時(shí)也帶來了管網(wǎng)供熱效率低、供熱質(zhì)量差、水泵能耗高等問題。因此研究供熱管網(wǎng)水力工況變化規(guī)律對減輕管網(wǎng)水力失調(diào)、實(shí)現(xiàn)供熱經(jīng)濟(jì)運(yùn)行具有重要的意義。本文基于石家莊市某大型環(huán)狀管網(wǎng),建立了管網(wǎng)水力工況數(shù)學(xué)模型并對其進(jìn)行水力工況分析。首先在連通閥不同啟閉狀態(tài)下,對管網(wǎng)流量變化規(guī)律及水泵能耗進(jìn)行研究。結(jié)果表明,大環(huán)上連通閥啟閉狀態(tài)會對整個(gè)管網(wǎng)產(chǎn)生較大的水力影響,而小
3、環(huán)上連通閥啟閉狀態(tài)主要對其所在管路產(chǎn)生水力影響;當(dāng)連通閥均關(guān)閉時(shí)管網(wǎng)呈枝狀,水泵電耗最小。當(dāng)連通閥均開啟時(shí)管網(wǎng)呈環(huán)狀,水泵電耗最大。其次對處于不同位置的管段發(fā)生事故時(shí)管網(wǎng)流量變化規(guī)律進(jìn)行預(yù)測研究,并計(jì)算獲得管網(wǎng)限額供熱時(shí)的最大限額流量系數(shù),以及各事故工況下熱用戶入口閥門開度。結(jié)果表明,離熱源最近的管段發(fā)生事故時(shí)管網(wǎng)水力失調(diào)最嚴(yán)重,其最大限額流量系數(shù)最小;而離熱源較遠(yuǎn)的管段發(fā)生事故時(shí)因部分管段反向供熱,可保證所有熱用戶水力失調(diào)度介于0.85-1.15之間。本文還對處于不同位置的熱用戶關(guān)閉時(shí)管網(wǎng)流量分布進(jìn)行模擬,研究不同數(shù)量熱用戶關(guān)閉時(shí)管網(wǎng)流量變化規(guī)律以及水泵的相應(yīng)調(diào)
4、節(jié)轉(zhuǎn)速。結(jié)果表明,近端用戶關(guān)閉相較遠(yuǎn)端會造成更嚴(yán)重的水力失調(diào);擬合獲得管網(wǎng)流量減小比與水泵轉(zhuǎn)速的關(guān)系式。最后對熱用戶入口閥門分別使用球閥、蝶閥、截止閥時(shí)管網(wǎng)的水力穩(wěn)定性進(jìn)行了研究。結(jié)果表明,各熱用戶入口閥門均為蝶閥時(shí),管網(wǎng)水力穩(wěn)定性最好;熱用戶入口閥門均為截止閥時(shí),管網(wǎng)水力穩(wěn)定性最差。關(guān)鍵詞:環(huán)狀熱網(wǎng)水力工況連通閥限額供熱閥門IABSTRACTAsChina'scentralheatsupplynetworkdevelopsgraduallytoalarge-scale,hydraulicimbalancephenomenonisbecomingmuchobvio
5、usly,alsoitbringsmanyquestionssuchaslowefficiency,poorqualityandhighpumpenergyconsumption.Sotoresearchonthehydraulicconditionvariationoftheheatsupplynetworkissignificantforreducinghydraulicimbalanceandcanmakeheatsupplynetworkoperatingeconomically.TakingShijiazhuang’sYuhuaring-shapedhe
6、atsupplynetworkforexampleandestablishingthenetworkmodel,thispapermakescomprehensiveanalysisofhydraulicconditions.Tofindouttherulesofthenetwork’sflowdistributionandthepumpenergyconsumption,thispapermakesdifferentschemesforthestatesofcommunicatingvalves,itcomestoconclusionthatthecommuni
7、catingvalvesinbigringcaninfluencethewholenetwork’sflow,butthecommunicatingvalvesinsmallringcanonlyinfluencethesmallring’susers;Whencommunicatingvalvesareallclosed,thepumpenergyconsumptionisthelowestandwhentheyareallopen,thepumpenergyconsumptionishighest.Thepapersimulatesheatusers’flow
8、chang