CAJ | 학술논문

针对煤催化气化反应器设计中遇到的材料问题，采用碳酸钾及催化气化工况富含碱金属气化灰渣为实验原料，进行了碱金属腐蚀刚玉质耐火材料的实验研究。着重考察了有氧空气气氛和无氧还原性气氛、反应温度、反应时间、碱金属存在形态对腐蚀行为的影响，并结合SEME-DX、XRD、核磁Al谱等表征手段，研究了反应前后碱金属和刚玉质耐火材料的成分、物相及结构变化。结果表明，碱金属对耐火材料腐蚀行为受反应的温度、气氛、时间及碱金属存在形态等因素影响较大。分析表明，有氧空气气氛下腐蚀尤为严重的原因是，原料中存在的钾与刚玉耐火材料发生化学反应生成新的钾的铝酸盐物相，且其含量随温度升高、反应时间延长而增加。
침대매최화기화반응기설계중우도적재료문제，채용탄산갑급최화기화공황부함감금속기화회사위실험원료，진행료감금속부식강옥질내화재료적실험연구。착중고찰료유양공기기분화무양환원성기분、반응온도、반응시간、감금속존재형태대부식행위적영향，병결합SEME-DX、XRD、핵자Al보등표정수단，연구료반응전후감금속화강옥질내화재료적성분、물상급결구변화。결과표명，감금속대내화재료부식행위수반응적온도、기분、시간급감금속존재형태등인소영향교대。분석표명，유양공기기분하부식우위엄중적원인시，원료중존재적갑여강옥내화재료발생화학반응생성신적갑적려산염물상，차기함량수온도승고、반응시간연장이증가。
The research on the issue of material corrosion in catalytic coal gasifier was fouc sed on, in which the potas ium carbonate and the coal ash from catalytic coal gasification with high alkali content were used to test the corrosion to the corundum refractory.The corundum refractory corroded by alkali metals ta different reaction atmospheres,t emperatures, reaction time, and alkali metal forms was characterized byu sings canninge lectron microscope and energy sep ctrum analysis ( SEM-EDX ) , X-rayd iffraction ( XRD ) aan lysis, and 27 Al nuclear magnetci resno ance ( NMR) analysis. The results hs ow that the cor osive behavoi r of alkali mte als on refractory is affected by temperature, reaction atmosphere, reaction time, and alkali metal forms.Specially, the more serious corrosion of corundum refractory in air takes place due to a new phase, potassium aluminate, being formed via chemical reaction between potassium carbonate or coal ash with high alkali content and corundum refractory, and the content of potassium aluminate icn reases with increasing temperature and reaction time.