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| 1 | Agglomeration Characteristics of River Sand and Wheat Stalk Ash Mixture at High Temperatures显示文摘The agglomeration characteristics of river sand and wheat stalk ash mixture at various temperatures are investigated using a muffle furnace. The surface structural changes, as well as the elemental makeup of the surface and cross-section of the agglomerates, are analyzed by polarized light microscopy, scanning electron microscopy (SEM), and energy dispersive X-ray (EDX). Multi-phase equilibrium calculation is performed with FactSage in identifying the melting behavior of the river sand-wheat stalk ash mixture at high temperatures. No indication of agglomeration is detected below 850°C. At a temperature of 900-1000°C, however, obvious agglomeration is observed and the agglomerates solidify further as temperature increases. The presence of potassium and calcium enrichment causes the formation of a sticky sand surface that induces agglomeration. The main component of the agglomerate surface is K_2O-CaO-SiO_2, which melts at low temperatures. The formation of molten silicates causes particle cohesion. The main ingredient of the binding phase in the cross-section is K_2O-SiO_2-Na_2O-Al_2O_3-CaO; the agglomeration is not the result of the melting behavior of wheat stalk ash itself but the comprehensive results of chemical reaction and the melting behavior at high temperatures. The multi-phase equilibrium calculations agree well with the experimental results. | Shang Linlin Li Shiyuan Lu Qinggang | 2013 | Journal of Thermal Science2013，22，1： | 0 |
| 2 | 热黏熔颗粒团聚的实验模拟显示文摘针对流化床内颗粒受热产生黏性及由此引发的团聚、失流化现象,利用低温模拟物聚乙烯颗粒在二维内循环流化床实验台内对床内颗粒受热团聚过程进行实验模拟,找了颗粒团聚成长规律。通过分析不同工况下的团聚物质量占物料总质量的比例,找出影响颗粒团聚的因素。实验表明,流化床内颗粒团聚过程分为两个主要阶段:成核阶段及黏性核快速长大并破碎阶段。流化床运行温度存在一高一低两个临界点,当温度低于较低临界点时,床内颗粒平稳流化,无团聚现象出现;当温度高于低临界点低于高临界点时,床内颗粒出现部分团聚;当温度高于高临界点时,床内颗粒迅速出现大范围团聚,因此将低临界点定义为第一临界温度,高临界点定义为第二临界温度。较低床温、合理流化风速配比、高非黏颗粒比例都对颗粒团聚有显著抑制作用。 | 陈博 范浩杰 崔璇 何柯佳 刘翔 | 2016 | 锅炉技术2016，47，6： | 0 |
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