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空气预热器的低温腐蚀机理是怎样的

点击次数:   更新时间:21/10/19 15:17:10     来源:nunsnun.com关闭分    享:

       接(jie)下来(lai),搪瓷管空气预(yu)热器厂家(jia)从若干(gan)留(liu)言(yan)(yan)中,选了(le)一个空(kong)气预热(re)器的(de)低温(wen)腐蚀机理的(de)问题(ti),为大家(jia)解(jie)答一下疑问,以后J9九游会AG 还会不定时(shi)从留(liu)言(yan)(yan)中选取问题(ti)进(jin)行解(jie)答。
  燃料(liao)中(zhong)的(de)硫(liu)(liu)在(zai)燃烧(shao)后生成二氧(yang)化(hua)硫(liu)(liu)(SO2),其(qi)中(zhong)有(you)少(shao)量的(de)SO2(只(zhi)占SO2的(de)1%左右)又会进一步氧(yang)化(hua)而形(xing)成三(san)氧(yang)化(hua)硫(liu)(liu)(SO3)。由于(yu)三(san)氧(yang)化(hua)硫(liu)(liu)在(zai)烟(yan)(yan)气(qi)中(zhong)存在(zai),则使烟(yan)(yan)气(qi)的(de)露点(dian)(dian)温(wen)(wen)度升(sheng)高,即(ji)三(san)氧(yang)化(hua)硫(liu)(liu)和烟(yan)(yan)气(qi)中(zhong)水蒸(zheng)气(qi)化(hua)合,生成硫(liu)(liu)酸(suan)蒸(zheng)汽,露点(dian)(dian)温(wen)(wen)度大为升(sheng)高。当含(han)有(you)硫(liu)(liu)酸(suan)蒸(zheng)汽的(de)烟(yan)(yan)气(qi)流经低(di)温(wen)(wen)受(shou)热(re)面(空气(qi)预热(re)器),受(shou)热(re)面金属(shu)壁温(wen)(wen)低(di)于(yu)硫(liu)(liu)酸(suan)蒸(zheng)气(qi)的(de)露点(dian)(dian)时, 则在(zai)受(shou)热(re)面金属(shu)表面结硫(liu)(liu)酸(suan)露(也即(ji)在(zai)预热(re)器低(di)温(wen)(wen)冷端波纹板上(shang)结硫(liu)(liu)酸(suan)露),并腐蚀(shi)受(shou)热(re)面金属(shu)。
  蒸(zheng)汽开始凝(ning)结的温度(du)称为(wei)露点(dian)(dian)(dian)(dian),通(tong)常(chang)烟气(qi)中水(shui)蒸(zheng)气(qi)的露点(dian)(dian)(dian)(dian)称为(wei)水(shui)露点(dian)(dian)(dian)(dian);烟气(qi)中硫酸蒸(zheng)气(qi)的露点(dian)(dian)(dian)(dian)称为(wei)烟气(qi)露点(dian)(dian)(dian)(dian)(或酸露点(dian)(dian)(dian)(dian))。
  水露点(dian)取决于(yu)水蒸气(qi)在烟(yan)(yan)气(qi)中(zhong)的分压力,一(yi)般为30-60℃,即(ji)使煤中(zhong)水分很大(da)(da)时,烟(yan)(yan)气(qi)水露点(dian)也(ye)不超过66℃。一(yi)旦烟(yan)(yan)气(qi)中(zhong)含(han)SO3气(qi)体,则使烟(yan)(yan)气(qi)露点(dian)大(da)(da)大(da)(da)升高,如(ru)烟(yan)(yan)气(qi)中(zhong)只要(yao)含(han)有(you)0.005%(50ppm)左右的SO3,烟(yan)(yan)气(qi)露点(dian)即(ji)可高达130-150℃或以(yi)上(shang)。
  这就(jiu)是搪(tang)瓷管空气预热器厂(chang)家分享给大家的(de)相(xiang)关知识,欢迎大家电话咨询J9九游会AG 更多问题,J9九游会AG 会竭诚为您解(jie)答(da)。