CAJ | 학술논문

将3种不同金属管材样品环的气冷腐蚀探头置于某生物质与煤混烧的75 t/h 循环流化床(CFB)锅炉尾部烟道低温过热器前，通过空气冷却模拟过热器的管壁温度，获得3种混烧比例工况下(持续时间24 h)3种管材的积灰样品。利用扫描电子显微镜分析积灰的理化特性，探讨混烧比例和材料种类对积灰腐蚀的影响规律。结果表明：在测试工况下，样品环迎风面不存在明显积灰现象，而背风面积灰明显，且随着材料的不同而有所不同，但未发现明显腐蚀或金属磨损，表明碱金属含量相对较低的生物质与煤混烧并不会造成严重积灰及腐蚀。
장3충불동금속관재양품배적기랭부식탐두치우모생물질여매혼소적75 t/h 순배류화상(CFB)과로미부연도저온과열기전，통과공기냉각모의과열기적관벽온도，획득3충혼소비례공황하(지속시간24 h)3충관재적적회양품。이용소묘전자현미경분석적회적이화특성，탐토혼소비례화재료충류대적회부식적영향규률。결과표명：재측시공황하，양품배영풍면불존재명현적회현상，이배풍면적회명현，차수착재료적불동이유소불동，단미발현명현부식혹금속마손，표명감금속함량상대교저적생물질여매혼소병불회조성엄중적회급부식。
During ash decomposition and corrosion tests in a 75 t/h circulating fluidized bed (CFB)boiler burning coal and biomass,the corrosion probe equipped with three kinds of metal samples was placed in front of the superheater,and the superheater tube wall temperature was simulated with a system of air cooling.Three kinds of metal deposition samples were obtained in operating mode (duration time of 24 hours)with three mixing ratios of coal and biomass.The physicochemical property of the samples was ana-lyzed by SEM-EDX.The results show that,under the testing conditions,no deposition was found at the wind side,and the deposition formed at the lee side was different for different metallic materials.No materi-al loss or significant corrosion was detected.It is proved in this study that depositions at the lee side of the superheater were probably more serious than that at the wind side,and the co-combustion of coal and bio-mass containing low levels of alkali metal will not cause serious deposition or corrosion and can be applied in industrial production.