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Direct modification of solid residues during co-firing of coal sludge and coal

机译：煤泥和煤共烧过程中固体残留物的直接改性

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In order to utilize the solid residues simultaneously with clean and high-combustion efficiency when firing high sulfur and ash coal sludge generated in coal washing process in China, the mineral composition and usability of combustion solid products were investigated when injecting compound additives into series of coals or coals blended with sludges. In this study, a single burner furnace was used for combustion test and the solid residues were analyzed by means of X-ray powder diffraction method. The influences of temperature, residence time, and compound additives on mineral characteristics of the residues have been discussed. The results indicate that, the compositions of solid products are principally free oxides and a small amount of gehlenite, dicalcium silicate, etc. below 1000 deg C; when the firing temperature increases above 1100 deg C, the major minerals are gehlenite and dicalcium silicate. Also it can be found that several seconds is not enough for mineral complete reaction, and suitable calcium oxide content and particles fineness are recommended. The result of combustion test shows that there is no evident effect on ignition and combustion when the additive/coal (a/c) ratio is below 30 percent by weight; and the normal stable combustion with ignition delay can be achieved when the a/c ratio is ranging between 30 and 50 percent; but the a/c ratio exceeding 50 percent will damage combustion and even result in fire extinction. Industrial test results indicated that the solid residues was composed of silicate mineral rich in belite by adopting compound additives, but the comprehensive reaction mechanism needs further studies as well as the effect of additives on combustion should be concerned.
机译：为了燃烧我国洗煤过程中产生的高硫，高灰煤渣，同时利用固体残渣，清洁，高燃烧效率，对系列煤中注入复合添加剂进行了研究，研究了固体成分的矿物组成和可燃性。或混有污泥的煤。在这项研究中，使用单个燃烧器炉进行燃烧测试，并通过X射线粉末衍射法分析固体残留物。讨论了温度，停留时间和复合添加剂对残留物矿物特性的影响。结果表明，在1000℃以下，固体产物的组成主要是游离氧化物和少量的菱沸石，硅酸二钙等。当烧成温度升高到1100摄氏度以上时，主要矿物是钠钙石和硅酸二钙。还可以发现，几秒钟不足以使矿物完全反应，因此建议使用合适的氧化钙含量和颗粒细度。燃烧试验的结果表明，当添加剂/煤（a / c）的比例低于30％（重量）时，对着火和燃烧没有明显的影响。当空燃比在30％至50％之间时，可以实现正常稳定的燃烧，具有点火延迟。但空燃比超过50％会损坏燃烧，甚至导致灭火。工业试验结果表明，采用复合添加剂，固体残渣由富含贝利特的硅酸盐矿物组成，但综合反应机理有待进一步研究，应关注添加剂对燃烧的影响。

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