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ID:52484034
大小:1.05 MB
页数:7页
时间:2020-03-28
《增压锅炉锅筒瞬态温度场在线监测.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第42卷第3期华北电力大学学报Vo1.42,No.32015年5月JournalofNoAhChinaElectricPowerUniversityMay,2015doi:10.3969/j.ISSN.1007—2691.2015.03.12增压锅炉锅简瞬态温度场在线监测李斌,史良宵,陈丰,孙恩慧(华北电力大学能源动力与机械工程学院,河北保定071003)摘要:为了在线监测增压锅炉锅筒瞬态温度。充分利用导热反问题解法的优势并结合锅筒边界条件复杂的特点,提出了导热正反问题耦合求解的锅筒瞬态温度场计算方法。为减弱温度场初始条件的影响,根据外壁是否受热分区域采用导热.t~-/反问题
2、求解温度,在两部分交接区域,将反问题解法求得的交界温度值赋值给正问题解法作为已知边界条件,从而实现正反问题耦合,求解整个锅筒的温度场。在此基础上,开发了锅筒瞬态温度场在线监测系统并指导锅炉运行操作。利用Ansys对某锅炉冷态启动过程锅筒温度进行了计算,并根据实验数据对本文的方法进行了验证。结果表明,导热正反问题耦合解法对复杂边界条件具有较强的适应性。关键词:锅筒;耦合解法;温度场;在线监测中图分类号:TK223.1文献标识码:A文章编号:1007—2691(2015)03—0078—07OnlineTransientTemperatureMonitoringSystemfor
3、Turbo-chargedBoilerDrumsLIBin,SHILiangxiao,CHENFeng,SUNEnhui(SchoolofEnergyPowerandMechanicalEngineering,NorthChinaElectricPowerUniversity,Baoding071003,China)Abstract:Aimingatonlinemonitoringthetransienttemperatureofturbo—chargedboilerdrum,andtakingfulladvan·rageofthesuperiorityoftheinvers
4、emethodtoheatconductionproblemcombinedwiththecomplicatedcharacteristicsofthedrumboundaryconditions,thispaperpresentsacalculationmethodofdrum’Stransienttemperaturefield.Toweakentheeffectsoftemperaturefieldinitialized,thedrumwasdividedintotwopartsaccordingtowhethertheouterwallwasheatedornot.T
5、heinversemethodandthedirectmethodwererespectivelyusedtosolvethetemperaturefield.Atthejunctionofthetwoareas,thetemperaturesdeterminedbytheinversemethodwereusedastheknownboundaryconditionstocalculatethetemperaturefieldofheatedareathroughthedirectmethodfortheheatedarea.Bythiswaythecouplingsolu
6、tionofthedirectandinverseheatconductionproblemwererealized,andthedataofthewholetem—peraturedistributionofthedrumwasobtained.Basedonthesedata,anonlinetransienttemperaturemonitoringsystemforboilerdrumhasbeendevelopedandusedtoguidetheoperationoftheboiler.Tovalidatetheresults,thetransienttemper
7、aturedistributionofthedrumduringacoldstartupprocesscalculatedbyAnsys,togetherwiththeexperimentaldata,areusedtOcontrastwiththeprogram.Thecomparisonoftheresultsoftemperaturefieldshowsthatthedirectandinversecouplingsolutionofheatconductionhasastrongeradapta
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