Corrosion of phosphate added high-chrome refractory materials in an entrained-flow gasifier
Corrosion of phosphate added high-chrome refractory materials in an entrained-flow gasifier
复制标题
添加磷酸盐的高铬耐火材料在气流床气化炉中的腐蚀
DOI：
10.1016/j.ceramint.2022.01.271
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发表时间：
2022-02
影响因子：
5.2
通讯作者：
Guangsuo Yu
中科院分区：
文献类型：
--
作者：
Kuiyu Liu;Qinghua Guo;Xu Fang;Abdul Raheem;Yan Gong;Hongxia Li;Guangsuo Yu
气流床气化炉耐火衬里的耐久性是影响气化效率和成本的主要因素之一。结合热力学模拟计算，研究了工业气流床气化炉中添加磷酸盐的高铬耐火材料的腐蚀机理以及磷酸盐添加剂对延长使用寿命的影响。采用扫描电子显微镜(SEM)、能谱仪(EDS)和X射线粉末衍射仪(X射线衍射仪)对腐蚀后的样品进行了显微组织、化学成分和矿物相分析。结果表明，化学腐蚀主要发生在渣-基质界面和集料与基质区域的交界处。渣-耐火材料界面形成复杂的尖晶石固溶体。磷酸盐添加剂分解成气态产物(如O2、P_2O_3)，在炉渣-耐火材料界面或附近扩散到耐火材料内部，不仅造成氧化环境，而且增加了耐火材料内部的磷酸盐含量。渗层中的磷酸盐添加剂占据了(Cr，Al)2O_3固溶体晶体之间的间隙，减少了硅酸盐相的渗透，并吸附了渣中的钙和钠，从而增加了渣的粘度。
Durability of the refractory liner located in an entrained-flow gasifier is one of the main factors affecting the efficiency and cost of gasification process. This study investigates the corrosion mechanism of phosphate added high-chrome refractories in a commercial entrained-flow gasifier and the effect of phosphate additives on the improvement of service life combining thermodynamic simulation calculations. The microstructures, chemical compositions, and mineral phases of the corroded samples were analyzed by scanning electron microscopy (SEM and EDS) and X-ray powder diffraction (XRD). The results demonstrated that chemical corrosion mainly occurred at the slag-matrix interface and the junction of aggregates and matrix regions. Complex spinel solid solutions were formed at the slag-refractory interface. Phosphate additives decomposed into gaseous products (such as O2, P2O3) and diffused into the interior of refractories at or close to the slag-refractory interface, not only causing an oxidizing environment but also increasing the phosphate contents in the interior of refractories. Phosphate additives in the infiltration layer occupied the gaps between crystal grains of (Cr, Al)2O3solid solutions, reduced the infiltration of silicate phases, and absorbed Ca and Na in the slag, which subsequently increased the viscosity of the slag.
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DOI：
10.1016/j.jeurceramsoc.2010.11.024
发表时间：
2011-05-01
影响因子：
5.7
作者：
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通讯作者：
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影响因子：
7.2
作者：
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影响因子：
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作者：
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影响因子：
5.2
作者：
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DOI：
--
发表时间：
2002
期刊：
Industrial Furnace
影响因子：
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作者：
C. P. Dogan;K. Kwong;J. Bennett;R. Chinn;C. L. Dahlin
通讯作者：
C. P. Dogan;K. Kwong;J. Bennett;R. Chinn;C. L. Dahlin