600MW超临界机组两阶段蒸汽吹管简介.doc

600MW超临界机组两阶段蒸汽吹管简介瞿九生一系统概况某电厂1锅炉是由哈尔滨锅炉厂有限责任公司引进英国三井巴布科克（Mitsui Babcock）公司技术设计、制造的HG-1900/25.4-YM7型超临界参数变压运行直流炉、前后墙对冲燃烧方式、一次中间再热、单炉膛平衡通风、固态排渣、尾部双烟道、全悬吊结构型布置。锅炉的汽水流程以内置式汽水分离器为界设计成双流程，从冷灰斗进口一直到标高约43.966m的中间混合集箱之间为螺旋管圈水冷壁(螺旋管圈与水平倾角17.89)，再连接至炉膛上部的水冷壁垂直管屏和后水冷壁吊挂管，然后经下降管引入折焰角和水平烟道侧墙，再引入汽水分离器。从汽水分离器出来的蒸汽引至顶棚和包墙系统，再进入一级过热器中，然后再流经屏式过热器和末级过热器。锅炉采用正压直吹式制粉系统，配有六台上海重型机器厂生产的HP1003磨煤机正压直吹式制粉系统，并在最下层后墙煤粉燃烧器上布置了山东烟台龙源电力技术有限公司制造的等离子点火系统。锅炉主要参数见下表：项目单位BMCR过热蒸汽流量t/h1900过热蒸汽出口压力MPa(g)25.4过热蒸汽出口温度571再热蒸汽流量t/h1613.8再热器进口蒸汽压力MPa(g)4.633再热器出口蒸汽压力MPa(g)4.443再热器进口蒸汽温度319.7再热器出口蒸汽温度569根据电厂要求，采用两阶段、降压方式进行蒸汽吹洗工作，过热器和再热器通过两步法分别进行吹扫，即先吹洗过热蒸汽系统、吹洗合格后再吹洗再热蒸汽系统。吹洗再热蒸汽系统结束后，降压进行低压旁路系统的吹洗；过热器减温水管道喷水管道进行汽侧反吹洗。流程图见附页。二、吹管目的新安装的机组因为制造、安装、储存、运输等方面的原因，在过热器、再热器系统及蒸汽管道内不同程度地残存着沙粒、氧化铁皮、铁屑、焊渣、未冲洗掉的化学清洗物，这些物质存在会引起受热面管子堵塞、爆管及高温腐蚀，或被带入汽轮机内，将危及汽轮发电机组的安全运行。通过锅炉吹管可清除上述杂物，避免上述现象发生。三、吹洗流程1、流程1 吹洗过热器系统、主蒸汽管道系统启动分离器过热器系统主蒸汽管道主汽门（2路）临时管（2路）临吹门（2个）临时管（1路）靶板器1临时管消音器排大气。2、流程2 吹洗再热汽系统、冷再管道、热再管道启动分离器过热器系统主蒸汽管道主汽门（2路）临时管（2路）临吹门（2个）临时管（1路）冷再管道再热器热再管道中压主汽门（2路）临时管（2路）临时管（1路）靶板器1临时母管消音器排大气。四、吹管的检验靶板的检验按火电工程调整试运质量检验及评定标准（1996年版）的规定，在吹洗系数大于1的条件下，连续两次靶板上最大冲击斑痕粒径不大于0.5mm，且肉眼可见的斑痕不多于5点（小于0.2mm不计数），检验靶板为铝板或铜板，靶板的宽度为排汽管内径的8%(25mm)，长度纵贯管子内径。五、吹管过程简况1、吹管范围锅炉过热器系统、主蒸汽管道再热器系统、冷段、热段再热蒸汽管道低压旁路系统过热器、再热器减温水系统2、吹管过程第一阶段:2008年6月9日5：42#1炉等离子拉弧成功，启动C制粉系统，锅炉点火成功。2008年6月9日11:20进行第一次试吹，开始进行第一阶段吹管，采用降压方式吹管，吹管频率每小时34次，分离器压力67MPa，主蒸汽温度350450之间。6月12日16:30第一阶段吹管结束，共吹管69次，有效次数60次，第67、68、69次连续三次靶板合格，锅炉停炉。吹管参数详见附表一。 第二阶段:6月14日3:15等离子拉弧成功，启动C制粉系统，锅炉点火成功，6月14日6:17进行第一次试吹，开始进行第二阶段吹管，采用降压方式吹管，吹管频率每小时34次，分离器压力67MPa，主蒸汽温度350450之间，6月14日23：09锅炉停炉冷却。2008年6月15日13：00锅炉进水，14: 50等离子拉弧成功，启动C制粉系统，锅炉点火吹管，6月16日2：10第二阶段吹管结束，共吹管73次，连续打靶三次合格，锅炉停炉，自然降压。吹管参数详见附表二。3、锅炉吹管记录附表一 第一阶段吹管记录吹管次数开门时间分离器出口压力（MPa）分离器出口温度（）过热器出口压力（MPa）过热器出口温度（）吹管系数备注2008年6月9日11:201.952071.782571.11试吹11:472.372072.412600.68试吹13:102.711973.022450.62试吹13:254.131944.752570.67试吹13:424.231925.62620.57试吹114:406.122426.173411.77214:506.52686.523001.9619:211.992032.032711.85试吹19:474.02403.83310.87试吹320:015.62685.283801.47420:166.32776.04011.64520:286.52826.53351.77620:506.012576.033191.49721:597.022567.043221.46823:036.92856.53551.79923:236.932856.793271.872008年6月10日1000:087.752577.73351.631100:327.12886.952792.361201:097.892957.753341.871301:476.072775.844201.671402:057.472577.423571.731502:326.312796.153851.761602:566.52816.43811.861703:136.22806.184311.641803:356.32816.24391.741903:576.62816553741.68204:316.862826.154011.76加靶板2105:026.642836.623921.862205:387.132887.03992.052306:156.92766.723961.812406:486.692836.653771.822507:296.892856.723761.952608:086.792696.723461.922008年6月11日02:204.572694.573721.09试吹2702:545.882755.854091.642803:097.152896.983811.952903:307.092877.033811.993003:417.282897.283941.993103:577.322907.203811.983204:107.292907.233742.073304:237.202897.193922.03404:416.542826.533861.873504:586.712846.73991.823605:156.52836.484141.813706:316.402826.393701.822008年6月12日06:384.382524.363791.12试吹387:336.02765.43151.62397:566.192686.243491.71408:306.62786.74301.86加靶板418:576.52716.54301.86429:156.532786.54301.69439:386.82796.54081.73449:496.72786.643461.734510:156.82866.93641.704610:366.622776.674051.854711:086.62806.44111.89加靶板4811:326.72776.644241.874911:436.62776.64351.855012:146.82727.574302.25112:436.72696.873981.895212:546.92766.84071.795313:306.422773.83461.785413:466.852776.933711.885513:586.642776.523831.815614:166.762776.63711.87加靶板5714:466.72766.43671.785815:046.292736.293781.72加靶板5915:226.42776.43861.76加靶板6015:376.32796.33791.63加靶板16:046.32756.343661.7216:125.92736.033661.56附表二 第二阶段吹管记录吹管次数吹管时间分离器出口压力（MPa）分离器出口温度（）再热器入口压力（MPa）再热器入口温度（）再热器出口压力（MPa）再热器出口温度（）再热器吹管系数备注2008年6月14日5:503.02360.461810.342872.39试吹6:154.362560.732210.533383.82试吹16:296.362791.42571.04087.4326:476.212721.22070.93902.137:026.202781.322080.994022.3847:225.932761.172320.884052.2457:425.902731.012450.673082.1667:546.62751.032550.723782.2078:136.122781.132800.83902.2088:326.372801.243020.84202.3698:476.452721.203230.764072.35109:146.402701.213270.784052.35119:266.552721.313450.874182.37129:586.542711.282810.824082.401310:026.602811.302920.844252.411410:406.502721.132820.814152.271511:016.292711.122990.814192.231611:216.42721.223190.904262.391711:296.472761.253440.944322.371811:486.572771.253560.934202.371912:596.622751.193420.894042.272013:076.622761.373431.024102.392113:306.312741.173330.884182.262214:456.342741.203610.894352.312314:506.362731.243670.924382.342415:196.52811.643641.274292.952515:506.42811.42041.14092.72616:306.572670.891981.14002.12716:516.542740.932691.254102.342817:216.72720.92801.214002.3加靶板2917:586.692721.163030.904072.303018:066.782731.273230.944162.43118:166.972741.453601.074252.633219:046.562771.173520.884272.333319:096.722771.233520.934292.353419:306.872751.233570.914232.43519:366.722771.293690.974222.473619:436.932861.453721.094392.673720:186.542821.132790.834402.293821:156.612821.073930.784532.403921:546.32821.154030.814722.434022:216.502821.094080.794832.484122:296.32791.134080.794832.484223:006.252781.183900.884602.242008年6月15日18:283.922460.642130.472851.37试吹4318:525.862590.972040.723042.04419:016.562691.142330.863292.294519:106.422741.232680.913642.384619:156.52731.303350.974382.494719:286.52741.193440.854052.364819:476.712831.203680.904272.374920:186.682831.363561.04152.555020:256.502831.423381.094092.605120:476.662831.222990.924242.335220:556.932861.273350.964402.435321:236.252791.03560.794542.115421:336.572831.203700.904472.355521:536.502821.143740.854432.265622:126.132741.133690.854132.17加靶板5722:376.492781.563611.194122.885823:027.02871.402971.064532.615923:087.222881.473171.114662.726023:226.912851.263240.954582.446123:376.292791.233390.924552.336223:536.252791.263450.954392.37加靶板2008年6月16日6300:036.122791.293410.974322.40加靶板6400:246.582821.253350.954352.31加靶板6500:336.462831.473321.134302.28加靶板6600:536.552831.242870.944302.286700:556.792841.313020.994372.786801:006.912861.532941.164362.786901:186.502811.192700.914482.277001:246.512811.212830.914512.267101:416.172771.153160.864512.20加靶板7201:516.242811.103330.834542.16加靶板7302:097.082861.123330.814502.54加靶板附表三 吹管时间