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1、防城港电厂#2机组炉膛压力控制摘要炉膛负压是反映燃烧工况稳定与否的重要参数,是运行中要控制和监视的重要参数之一。炉内燃烧工况一旦发生变化,炉膛负压随即发生相应变化。因此,监视和控制炉膛负压对于保证炉内燃烧工况的稳定、分析炉内燃烧工况、烟道运行工况、分析某些事故的原因均有极其重要的意义。本设计就是从锅炉引风机方面进行炉膛负压的研究。目前国内火力发电厂锅炉风机大部分采用拖动电动机,其中95%左右为交流异步电动机直接拖动,恒速运行。随着电力经济的发展等,使电厂中的锅炉风机在运行中出现了裕量较大的问题,另外根据电网调峰的需要,机组长时间处于低负荷运行状态,使锅炉的送、
2、吸风机长期处于低参数下运行,对厂用电率造成一定影响。目前国内直属发电厂锅炉风机配备的电动机以1MW左右居多,大部分都是采用恒速运行,造成很大的浪费。根据节能工作的要求,其中有个别发电厂已考虑或试用风机调速运行,解决目前风机运行中出现裕量过大的问题。风机调速有几种方案,其中,应用最多的是变频器技术,或加装液力偶合器装置。本设计对防城港#2机组进行分析、研究,了解其炉膛压力和送、引风机之间的关系并对其控制系统进行分析。关键词:炉膛负压,变频调速,液力耦合器调速III防城港电厂#2机组炉膛压力控制AbstractParametersstability,control
3、andsurveillanceisinoperationtooneoftheimportantparameters。Thesituationchangedoncetheheatercombustion,chamberpressurecorrespondingchangesoccurimmediately.Whentheboilercombustionsystemfailureorunusual,thefirstnegative,willbereflectedinthechamber,thenisthefirelocation,suchaschangesinfl
4、amesandsecondlyisthesteamparameterschange.Therefore,surveillanceandcontrolofcombustionchamberpressuretoensurethatthestatusoftheheaterstability,thesituationanalysisoftheheatercombustion,flue-operationstatus,analysisofcertaincausesofaccidentsareextremelyimportant.Fromtheboilerair-comp
5、ressorsdesignedforchamberpressureresearch.Mostofthecurrentdomesticpowerboilersair-compressorsusedMercedeselectricmotors,whichexchangesasynchronousmotorforabout95%ofdirectfees,Hengsuoperation.Withthepowerofeconomicdevelopment,singleunitsincreasedcapacityandthedevelopmentofscienceandt
6、echnology,enterprisemanagementimprovements,thepromotionoftechnologicaltransformationequipment,theplant'sboilersair-compressorsinoperationemergedYulargervolume,andaccordingtotheneedsofpowerplants,generatingprolongedlowloadoperation,boilerssend,smokinginalowlong-termparametersoftheope
7、rationofair-compressors,electricityrateshaveanimpactontheplant..Currentdomesticair-compressorswiththeimmediatepowerplantboilerstoelectricmotorsarearound1MW,mostlyusedHengsuoperation,causinggreatwaste.Accordingtotheenergyconservationrequirements,includingindividualpowerplantshavecons
8、ideredortestedair-c