CAJ | 학술논문

为研究不同煤熔渣对高铬砖的侵蚀机制，选取4种物理化学性能差异较大的典型气化炉用后煤熔渣，采用化学分析、XRD、SEM及EDS等研究了不同煤熔渣的性能及其对w（Cr2 O3）≥90％的高铬砖的侵蚀、渗透情况。结果表明：气化炉中煤熔渣主要由SiO2、CaO、Al2 O3、Fe2 O3、MgO组成，但不同煤熔渣的化学组成差异较大，矿物组成及熔融特性温度也不同；在相同条件下，高铬砖侵蚀的主要影响因素是温度和熔渣的化学组成，随温度升高，煤熔渣对高铬砖的侵蚀急速加剧；煤渣中的熔融指数较低时，煤熔渣对高铬砖的侵蚀渗透较为严重；煤熔渣中低熔点相向材料内部渗透、渣中SiO2等对材料中ZrO2等的反应溶解是造成高铬砖失效的直接原因；高铬砖表面形成镁铝铬铁复合尖晶石致密层可以有效降低高铬砖的侵蚀程度。
위연구불동매용사대고락전적침식궤제，선취4충물이화학성능차이교대적전형기화로용후매용사，채용화학분석、XRD、SEM급EDS등연구료불동매용사적성능급기대w（Cr2 O3）≥90％적고락전적침식、삼투정황。결과표명：기화로중매용사주요유SiO2、CaO、Al2 O3、Fe2 O3、MgO조성，단불동매용사적화학조성차이교대，광물조성급용융특성온도야불동；재상동조건하，고락전침식적주요영향인소시온도화용사적화학조성，수온도승고，매용사대고락전적침식급속가극；매사중적용융지수교저시，매용사대고락전적침식삼투교위엄중；매용사중저용점상향재료내부삼투、사중SiO2등대재료중ZrO2등적반응용해시조성고락전실효적직접원인；고락전표면형성미려락철복합첨정석치밀층가이유효강저고락전적침식정도。
Four used coal slags from a typical gasifier with different chemical compositions and physical properties were chosen,and their properties and the corrosion and penetration to high chrome bricks (Cr2 O3≥90 mass%)were studied by chemical analysis,XRD,SEM and EDS in order to research the cor-rosion mechanism of different coal slags to high chrome bricks.The results indicate that:(1)the four molten coal slags from gasifier are mainly composed of SiO2 ,CaO,Al2 O3 ,Fe2 O3 ,and MgO,and their contents vary with the coal kind obviously,which leads to the different mineral compositions and melting characteristic temperatures of coal slag;(2)under the same conditions,the main factors influencing the corrosion to high chrome bricks are temperature and chemical compositions;with the temperature rising,the corrosion to high chrome bricks aggravates markedly;(3)corrosion and penetration of coal slag to high chrome bricks are severe when the melting index R of coal slag is low;(4)penetration of low melting phases in coal slag to bricks,and reaction and dissolution between SiO2 in coal slag and ZrO2 in high chrome bricks lead to the direct failure;(5)a dense complex spinel (Mg,Fe)(Cr,Al,Fe2O4)layer is formed near the hot face of high chrome brick,which reduces the erosion degree effectively.