CFB锅炉管式空气预热器堵灰的分析与治理

20122February20124254InnerMongoliaScienceTechnology&EconomyNo.4TotalNo.254CFB锅炉管式空气预热器堵灰的分析与治理X马　辉(,014300):对上海锅炉厂SG-690/13.7-M451CFB锅炉管式空气预热器堵灰问题进行了分析,总结了运行三年多来因管式空预器积灰对锅炉运行造成的影响,分析总结了其问题及原因,提出了解决方法。:堵灰原因;低温结露;低温腐蚀;解决方法:TM621.2　　:A　　:1007—6921(2012)04—0099—04,,200MW15Kpa,,,,,,,,,690t/h,,1SG-690/13.7-M451CFB1.1　锅炉及空气预热器结构简介200MW,,,,,,,,,,,560*2,L=7.6m,NS1-312840,14400,,1.2　锅炉资料与管式空预器参数1.2.111202020202/353535353230227.5223.5197.54230227.5223.5197.551351331301196%1.771.771.773.167%6.075.975.885.178%0.050.060.070.079%0.350.370.390.3910%0.060.060.060.0611%8.308.238.188.8612%91.7091.7791.8291.141.2.2(,BMCR)21.mm602.mm2.753.mm904.mm805.1986.1207.m2307688.m244.289.m218.4810.m/s9.711.m/s16.212.296.113.135.314.35.015.230.016.kcal/m2.h16.617.kcal/kg313299X:2011-12-12:马辉,工程师,从事电厂检修维护技术管理工作。2542.1　随着机组运行时间增长,空预器积灰问题逐步严重20071227,,,2010#4,1:12.2　随着空预器积灰问题的逐步严重,空预器出口风温大幅度降低,烟侧阻力不断增大,,,,22010,2,100,-0.7Kpa,-3.4Kpa,142155.8,203.7212.7,560000Nm3/h(,),257.1A216.8A,,-2.4Kpa,,,,,,3100CFB201242.3　积灰清理难度大,且管排低温腐蚀泄漏严重,,,,,,,45:452.4　积灰状况对运行工况的影响,,,,,,,,,,,,(),2010#4,,201010,#1,6,,236.9A200A,-3.4Kpa-1.765Kpa,2(#1)63,:1012543.1　实际使用煤种变化后烟气酸漏点升高3.1.1(3)3()1#2#Cy%43.2139.0745.1939.22Hy%3.423.213.242.75Oy%10.5510.3211.818.53Ny%0.690.860.670.42Sy%0.430.440.571.09Ay%31.736.130.5217.8Wy%10.010.08.020.1QrdwkJ/kg16294146761764416114Vr%23.8323.1523.1324.9KHG1/70686563t11500150015001500t21500150015001500t315001500150015003.1.2:Tld=tdp+B*(Ss)1/3/(1.05Afh*As):tdp(9,1.2.);B(125);Ss(1000*Sar/Qnet.ar*4.1868,Sar,Qnet.ar);Afh(0.7);As(1000*Aar/Qnet.ar*4.1868,Aar,Qnet.ar):Tld=tdp+B*(Ss)1/3/(1.05Afh*As)=9+125*(1000*Sar/Qnet.ar*4.1868)1/3/(1.050.7*1000*Aar/Qnet.ar*4.1868)=55.3:Tld=tdp+B*(Ss)1/3/(1.05Afh*As)=9+125*(1000*Sar/Qnet.ar*4.1868)1/3/(1.050.7*1000*Aar/Qnet.ar*4.1868)=79.9,,24.4,3.2　烟气酸漏点升高后的积灰状况分析3.2.1,,10,Ta:Ta=2Tm-Tg:Tm,Tg79.9,5,140,19.83.2.2(),919.8,,,,,3.3　暖风器系统没有投入是引起低温结露的主要原因,,,,4,,4.1　采用热管技术加热一二次冷风,,,4.2　采用热风再循环方式,,,,4.3　采用暖风器加热方式,,10250Pa,170,,,,,52011,,,35,[][1]　朱国祯,徐洋.循环流化床锅炉设计与计算[M].北京:清华大学出版社,2004.102