CAJ | 학술논문

采用蓄热材料将高温烟气的余热回收利用于预热助燃空气可以提高垃圾焚烧炉的效率，降低能耗。本文以红柱石为主要原料制备了用于垃圾焚烧炉的红柱石陶瓷蓄热体材料。测试了样品的吸水率、气孔率、体积密度、抗折强度和抗热震性能，采用x射线衍射仪（XRD）、扫面电子显微镜（SEM）和热膨胀仪等现代测试手段研究了样品相组成、结构和性能。结果表明：1420℃烧成的A5和A8配方样品性能较优．吸水率为0．1～0．87％。气孔率为0．24-1．98％，体积密度为2．28～2．43g·cm3，抗折强度为50．03～73．09MPa，抗热震性良好。A5样品（1420℃／2h）耐酸性为98．97％，耐碱．1生为97．72％，热膨胀系数为6．82×10-60c-1。相组成分析表明，A5样品主晶相的为莫来石，A8样品为莫来石、碳化硅。SEM研究结果表明，样品中气孔分布均匀，平均尺寸为5～10μm，莫采石晶体被玻璃相包裹，赋予样品较高的强度．断裂方式主要是穿晶断裂和沿晶断裂相结合的断裂模式。可满足垃圾焚烧炉中的蓄热材料的要求。
채용축열재료장고온연기적여열회수이용우예열조연공기가이제고랄급분소로적효솔，강저능모。본문이홍주석위주요원료제비료용우랄급분소로적홍주석도자축열체재료。측시료양품적흡수솔、기공솔、체적밀도、항절강도화항열진성능，채용x사선연사의（XRD）、소면전자현미경（SEM）화열팽창의등현대측시수단연구료양품상조성、결구화성능。결과표명：1420℃소성적A5화A8배방양품성능교우．흡수솔위0．1～0．87％。기공솔위0．24-1．98％，체적밀도위2．28～2．43g·cm3，항절강도위50．03～73．09MPa，항열진성량호。A5양품（1420℃／2h）내산성위98．97％，내감．1생위97．72％，열팽창계수위6．82×10-60c-1。상조성분석표명，A5양품주정상적위막래석，A8양품위막래석、탄화규。SEM연구결과표명，양품중기공분포균균，평균척촌위5～10μm，막채석정체피파리상포과，부여양품교고적강도．단렬방식주요시천정단렬화연정단렬상결합적단렬모식。가만족랄급분소로중적축열재료적요구。
Heat storage materials are used to improve the efficiency of waste incinerator and reduce energy consumption by recycling the waste heat of high temperature flue gas and preheating the combustion air. Andalusite was used as the main material to prepare ceramics by semi-dry pressing method and pressureless sintering in this study. The water absorption, porosity, bulk density, bending strength and thermal shock resistance have been measured. The phases formed and structural changes by sintering were investigated by X-Ray diffraction (XRD), scanning electron microscopy (SEM) and thermal dilatometer. The result shows that Samples A5 and A8 sintered at 1420~C have excellent performance with their thermal shock resistance, water absorption, porosity, bulk density and bending strength at 0.1-0.87%, 0.24~1.98%, 2.28~2.43g "cm-3 and 50.03~73.09MPa, respectively. The Acid resistance, alkaline resistance and linear thermal expansion coefficient of sample A5 were 98.97%, 97.92% and 6.82x10-e~C-1, respectively. Mullite was the major phase of these two samples, and SiC was also detected in sample A8 according to XRD patterns. Their pores were distributed uniformly with the average size between 5~10pm and the mullite crystal was parceled by glass phase as is indicated by SEM. The analysis of fracture surface suggests that there was a mixture of cracking mechanism (transgranular failure and intergranular failure) which gave the samples high bending strength. The as-prepared andalusite ceramics could meet the demand of heat storage material in RTO.