Effects of Strong Adsorption Pre-dehydration on Dehydration Energy Consumption of Montmorillonite Organic Gel
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摘要:
这是一篇陶瓷及复合材料领域的论文。蒙脱石有机凝胶是一种触变性凝胶，一般采用湿法工艺生产，需经喷雾干燥获得凝胶产品，但因喷雾干燥效率较低，能耗较高，干燥成本占生产成本的主要部分，进行降低脱水过程能耗的研究意义重大。论文提出了一种新型的低能耗预脱水工艺，预先在脱水池内充填比表面积大、吸水性能好的非金属矿物材料，然后将蒙脱石有机凝胶注入其中，充分搅拌，达到预脱水目的，再经喷雾干燥，得到高质量的有机凝胶产品。对预脱水流程设计专用工艺，并通过热量计算比较了经过预脱水过程及未经预脱水过程喷雾干燥的能量消耗。结果表明，经过预脱水工艺后比现有工艺节能约58%。
Abstract:This is an article in the field of ceramics and composites. Montmorillonite organic gel is a thixotropic gel, which is usually produced by wet process. It needs to be spray drying to obtain gel products. However, the drying cost accounts for the major part of the production cost due to the low efficiency and high energy consumption of spray drying. Therefore, it is of great importance to reduce the energy consumption in the process of dehydration. A new type of pre dehydration process with low energy consumption is proposed in this paper. A non-metallic mineral material with high specific surface area and good water absorption is filled into the dehydrated tank. The montmorillonite organic gel is injected into the dehydrated tank and stirred well to achieve the purpose of pre dehydration. The high-quality organic gel product is then obtained by spray drying. The special process for the pre-dewatering process is designed and the energy consumption of the pre-drying process and the spray drying process without pre dehydration are compared by thermal calculation. The results show that the pre dehydration process can save about 58% energy compared with the existing process.
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表 1 膨润土原矿的理化性质分析
Table 1. Physical and chemical properties of bentonite raw ore
膨胀容/
（mL/g）吸蓝量/
（g/100 g）阳离子交换容量/
（mmol/100 g）蒙脱石
含量/%47 42.25 92.05 88 
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表 2 喷雾干燥室初始参数
Table 2. Initial parameters of spray drying room
给料温度/℃ 出料温度/℃ 环境温度/℃ 环境湿度/% 给料量/（kg/h） 水分蒸发量/（kg/h） 喷雾干燥量/（kg/h） 有机凝胶含水率/% 20 70 20 70 375 250 625 4
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表 3 MDR-250喷雾干燥机技术参数
Table 3. Technical parameters of MDR-250 spray dryer
水份蒸发量/(kg/h) 物料固含量/% 喷液量(kg/h) 产品含水率/% 进风口温度/℃ 出风口温度/℃ 传动功率/kW 能耗/(kcal/h) 250 5～60 263.2
～6252～4 300 95 28 250000
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表 4 余热干燥器技术参数
Table 4. Technical parameters of the waste heat dryer
进风
温度/℃出风
温度/℃硅藻土进入
温度/℃硅藻土流出
温度/℃95 65 30 32
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