课程设计内容1.已知汽轮机机组型式及参数:机组型号:CZK300—16.67/0.4/538/538汽轮机型式:300MW亚临界参数、一次再热、双缸双排气、双轴单调整、直接空冷、抽汽凝汽式额定功率:eP=300MW主蒸汽参数(主汽阀前):0P=16.67MPa,0t=538℃;查焓熵图得0h=3398.96kJ/kg再热蒸汽参数:冷段:rhiP=3.6869Mpa,rhit=325.3℃,rhih=3038.85kJ/kg热段(中联门前):2rhP=3.318Mpa,2rht=538℃,2rhh=3539.44kJ/kg中联门后再热气压:'rhp=(1-δp2)2rhP=(1-0.0143)3.318=3.2706Mpa由'rhp=3.2706Mpa,'rhh=2rhh=3539.44kJ/kg,查水蒸气性质表,得中联门后再热气温'rht=537.797℃.低压缸排汽压力:cP=0.014Mpa,排汽比焓ch=2437.4kJ/kg计算热力系统的的有关参数:主汽门、调门及进气管道压损2%中低压连通管管道压损4.5%再热器及管道压损10%中联门及管道压损1.43%各段加热器抽气管道1、2、3段抽气压损3%,其余5%回热抽气级数3高+3低+1除氧转速3000r/min给水泵驱动方式电机驱动旋转方向顺时针方向(从汽轮机向发电机端看)额定给水温度:fwt=272.2℃。额定工况下的电机效率:98.95%,给水泵效率:83%。表1-1加热器端差2.各加热器进、出水参数计算1)首先计算高压加热器JG1加热器1P:P1(1p)P'j1=5.7215(1-0.03)=5.5499Mpa式中1P——第一抽汽口压力;1P——抽汽管道相对压损;又1P=5.5499MPa,查水蒸气性质表得加热器饱和温度1,st=270.545℃JG1出水温度1,wt:w,1s,1ttt270.5451.7272.245()℃式中t——加热器上端差。JG1疏水温度1dt:d1w,1t1tt243.8045.6249.404℃式中1t——加热器下端差,1t=5.61,wt——进水温度,其值从高压加热器JG2的上端差t计算得到已知加热器水侧压力WP=21.47MPa,由1t=272.245℃,查的JG1出水比焓1,wh=1192.79kJ/kg由1,wt=243.804℃,WP=21.47MPa,项目JG1JG2JG3CYJD1JD2JD3上端差(℃)-1.70002.82.82.8下端差(℃)5.65.65.6005.65.6查得JG1进水比焓1,wh=1058.01kJ/kg由1dt=249.405℃,1P=5.5499MPa,查得JG1疏水比焓1,dh=1082.77kJ/kg.至此,高温加热器JG1的进、出口汽水参数已经全部算出。2)计算高压加热器JG2加热器2P:P2(1p)P'j2=3.6869(1-0.03)=3.5763Mpa式中2P——第二抽汽口压力;2P——抽汽管道相对压损;又2P=3.5763MPa,查水蒸气性质表得加热器饱和温度2,st=243.804℃JG2出水温度2,wt:w,2s,2ttt243.8040243.804℃式中t——加热器上端差。JG2疏水温度2,dt:d2w,2t2tt205.2175.6210.8187,℃式中2t——加热器下端差,2t=5.6℃'2,wt——进水温度,其值从高压加热器JG3的上端差t计算得到已知加热器水侧压力WP=21.47MPa,由2t=243.804℃,查的JG2出水比焓2,wh=1058.0kJ/kg由'2,wt=205.217℃,WP=21.47MPa,查得JG2进水比焓'2,wh=884.037kJ/kg由2,dt=210.8187,℃2P=3.5763MPa,查得JG2疏水比焓2,dh=902.02kJ/kg.至此,高温加热器JG2的进、出口汽水参数已经全部算出。3)计算高压加热器JG3加热器3P:P3(1p)P'j3=1.7853(1-0.03)=1.7317Mpa式中3P——第三抽汽口压力;3P——抽汽管道相对压损;又3P=1.7317MPa,查水蒸气性质表得加热器饱和温度3,st=205.217℃JG3出水温度3,wt:w,3s,3ttt205.2170205.217℃式中δt——加热器上端差。JG3疏水温度td3:d3w,3t3tt175.6645.6181.264式中3t——加热器下端差,3t=5.6℃'3,wt——进水温度,其值从处氧气器CY的上端差δt计算得到已知加热器水侧压力wP=21.47MPa,由3t=205.217℃,查的JG3出水比焓3,wh=884.037kJ/kg由'3,wt=175.664℃,wP=21.47MPa,查得JG3进水比焓'3,wh=755.24.kJ/kg由3,dt=181.264℃,3P=1.7317MPa,查得JG3疏水比焓3dh=769.123kJ/kg.至此,高温加热器JG3的进、出口汽水参数已经全部算出。4)计算高压加热器CY加热器4P:P4(1p)P'j4=0.9542(1-0.05)=0.9065Mpa式中4P——第四抽汽口压力;4P——抽汽管道相对压损;又4P=0.9065MPa,查水蒸气性质表得加热器饱和温度4,st=175.664℃CY出水温度4,wt:w,4s,4t4tt175.6640175.664℃式中4t——加热器上端差。CY疏水温度4dt:4dt='4wt+4t=153.286+0=153.286℃式中4t——加热器下端差,4t=0'4wt——进水温度,其值从底压加热器JD1的上端差t计算得到已知加热器水侧压力wP=0.916MPa,由4t=175.664℃,查的CY出水比焓4wh=744.077kJ/kg由'4wt=153.286℃,wP=0.916MPa,查得CY进水比焓'4wh=646.696kJ/kg由td,4=153.286℃,P4=0.9065MPa,查得CY疏水比焓4dh=646.69kJ/kg.至此,高温加热器CY的进、出口汽水参数已经全部算出。5)计算低压加热器JD1加热器5P:P5(1p)P'j5=0.5884(1-0.05)=0.5590Mpa式中5P——第五抽汽口压力;5P——抽汽管道相对压损;又5P=0.5590MPa,查水蒸气性质表得加热器饱和温度5,st=156.086℃JD1出水温度5,wt:w,5s,5t5tt156.0862.8153.286℃式中5t——加热器上端差。JD1疏水温度5dt:d5w,5t5tt121.7045.6127.304℃式中5t——加热器下端差,5t=5.6℃'5wt——进水温度,其值从高温加热器JD2的上端差t计算得到已知加热器水侧压力WP=2.758MPa,由5t=153.286℃,查的JD1出水比焓5wh=647.816kJ/kg由5wt=121.704℃,WP=2.758MPa,查得JD1进水比焓'5wh=512.812kJ/kg由5dt=127.304℃,5P=0.5590MPa,查得JD1疏水比焓5dh=535.52kJ/kg.至此,高温加热器JD1的进、出口汽水参数已经全部算出。6)计算低压加热器JD2加热器6P:P6(1p)P'j6=0.2407(1-0.05)=0.2287Mpa式中6P——第六抽汽口压力;6P——抽汽管道相对压损;又6P=0.2287MPa,查水蒸气性质表得加热器饱和温度6,st=124.504℃JD2出水温度6wt:w,6s,6ttt124.5042.8121.704℃式中t——加热器上端差。JD2疏水温度6dt:d6w,6t6 tt90.20075.695.8007℃式中6t——加热器下端差,6t=5.6℃'6wt——进水温度,其值从低压加热器JD3的上端差t计算得到已知加热器水侧压力wP=2.758MPa,由6t=121.704℃,查的JD2出水比焓6wh=512.812kJ/kg由'6wt=90.2007℃,wP=2.758MPa,查得JD2进水比焓'6wh=379.891kJ/k由6dt=95.8007℃,6P=0.2287MPa,查得JD2疏水比焓6dh=401.5kJ/kg.至此,高温加热器JD2的进、出口汽水参数已经全部算出。7)计算低压加热器JD3加热器7P:P7(1p)P'j7=0.0827(1-0.05)=0.07857Mpa式中7P——第七抽汽口压力;7P——抽汽管道相对压损;又7P=0.07857MPa,查水蒸气性质表得加热器饱和温度7,st=93.0007℃JD3出水温度7,wt:w,1s,7ttt93.00072.890.2007℃式中t——加热器上端差。JD3疏水温度td7:d7t7ttw754.05.659.6℃式中7t——加热器下端差,7t=5.6℃'7wt——进水温度,其值从轴封加热器SG出水温度得到已知加热器水侧压力wP=2.758MPa,由7t=90.2007℃,查的JD3出水比焓7wh=379.891kJ/kg由'7wt=54.0℃,wP=2.758MPa,查得JD3进水比焓'7wh=228.399kJ/kg由7dt=59.6℃,7P=0.07857MPa,查得H7疏水比焓7dh=249.531kJ/kg.至此,高温加热器JD3的进、出口汽水参数已经全部算出。表1-2机组各级回热抽汽参数项目单位JG1JG2JG3CY(除氧器)JD1JD2JD3备注抽气压力'jPMpa5.72153.68691.78530.95420.58840.24070.0827已知抽气温度jt℃381.7325.3443.0356.4295.1200.72100.73已知抽气焓jhKJ/kg3136.43038.853345.63172.643052.172870.292679.6查h-s图可得加热器上端差t℃-1.70002.82.82.8已知加热器下端差1t℃5.65.65.605.65.65.6已知水侧压力wPMpa21.4721.4721.470.9162.7582.7582.758已知抽汽管道压损jP%3335555已知加热器侧压力jPMpa5.54993.57631.73170.90650.55900.22870.0786Pj=(1-δp)P’j汽侧压力下饱和温度sjt℃270.545243.804205.217175.664156.086124.50493.011查饱和蒸汽表出水温度wjt℃272.245243.804205.217175.664153.286121.70490.2007tsjjwtt,出水比焓jwh,1192.791058.0884.037744.077647.816512.812379.89查h-s图可得进水温度'wjt℃243.804205.217175.664153.286121.70490.200754.0已知进水比焓'wjhKJ/kg1058.01884.037755.24646.696512.812379.891228.399查h-s图可得疏水温度djt℃249.405210.8187181.264153.286127.30495.800759.61,tjwdjtt疏水比焓djhKJ/kg1082.77902.02769.123646.69535.52401.5249.531查h-s图可得3.计算回热抽汽系数与凝汽系数(1)1号高压加热器(JG1),1h由JG1的热平衡式求1疏冷JG1h'w,j1hw,j1hd,j1h1'111,1,1()djwjwjhhhh’,1,1111hh1192.791058.010.065633136.41082.7