In this work, four slag samples were collected from the OMB CWS gasification, and the mineral behavior and morphology were studied to explore the formation mechanism of blockage slag. Results showed that amorphous phase is dominant in all slag samples, which was mainly glassy substances rich in low-temperature eutectic of iron. The precipitation of metallic iron and the crystals of SiC, calcite, and quartz were found in slags which were taken from the bottom of the combustion chamber (S-b). The quench slag collected from stable operation conditions (S-s) had a low content of quartz crystalline. While slag from the down pipe of the quench chamber (S-b) and bulk slag from the water-cooled pool (S-p) had observed the precipitation of crystals. Comparing to S-s, carbon matters in S-b had a higher order degree of carbon structure. By comparing the slag sample obtained during stable operation (S-s) with slag blocking occurs (S-b, S-d, S-p), it is found that the blockage of the OMB CWS gasifier was strongly related to unreacted residual carbon and the high content of sodium and iron in coal. They will interact with each other and form small number of crystals and most of the amorphous material.

中文翻译：

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基于炉渣性质对比分析的气流床气化炉渣转化行为

本工作从OMB CWS气化过程中采集了4个渣样，研究了矿物行为和形态，探讨了堵塞渣的形成机制。结果表明，所有渣样均以非晶相为主，主要是富含铁的低温共晶的玻璃状物质。在从燃烧室底部（Sb）取出的炉渣中发现了金属铁的沉淀和 SiC、方解石和石英的晶体。从稳定操作条件 (Ss) 收集的急冷渣具有低含量的石英晶体。来自骤冷室（Sb）下管的熔渣和来自水冷池（Sp）的散装熔渣观察到晶体沉淀。与Ss相比，Sb中的碳物质具有更高的碳结构有序度。通过比较稳定运行（Ss）和发生堵渣（Sb、Sd、Sp）时获得的渣样，发现OMB CWS气化炉的堵塞与未反应的残碳和高钠铁含量密切相关。在煤炭中。它们将相互作用并形成少量晶体和大部分无定形材料。