| 颗粒状污泥的干燥特性及表观变化 |
| 摘要点击 4869 全文点击 2928 投稿时间：2010-10-19 修订日期：2011-01-12 |
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| 中文关键词 污泥 污泥颗粒 污泥干燥 干燥特性 表观变化 |
| 英文关键词 sewage sludge sludge granules sludge drying drying characteristics apparent change |
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| 中文摘要 |
| 对3种不同质量等级的污泥颗粒（2.5、 5和10 g）在100、 200、 300、 400和500℃下进行恒温干燥实验，通过观察污泥的失重特征和表观形态的变化，深入研究了污泥干燥过程、 失重速率的变化规律.结果表明，污泥在100～200℃下的干燥过程分为加速阶段、 恒速阶段和降速阶段，而在300～500℃下并没有真正的恒速阶段，但污泥表面产生的大量裂缝维持了较高的平均失重速率；污泥的平均失重速率与干燥温度呈二次方关系.在100～200℃时污泥的干燥过程不受颗粒大小影响，在300～500℃时同样大小污泥颗粒的干燥过程类似.在100～300℃时，直至焦化的干燥过程中并未发生有机物热分解；在400～500℃时，干燥过程中会伴随着部分有机物分解. |
| 英文摘要 |
| Three different weight grades of sludge granules(2.5, 5, 10 g) were dried at constant temperature of 100，200，300，400 and 500℃, respectively. Then characteristics of weight loss and change of apparent form during sludge drying were analyzed. Results showed that there were three stages during sludge drying at 100-200℃: acceleration phase, constant-rate phase, and falling-rate phase. At 300-500℃, there were no constant-rate phase, but due to lots of cracks generated at sludge surface, average drying rates were still high. There was a quadratic nonlinear relationship between average drying rate and drying temperature. At 100-200℃, drying processes of different weight grade sludge granules were similar. At 300-500℃, drying processes of same weight grade of sludge granules were similar. Little organic matter decomposed till sludge burning at 100-300℃, while some organic matter began to decompose at the beginning of sludge drying at 400-500℃. |
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