| 污泥热泵低温干化技术优势与问题探讨 |
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| 引用本文： | 傅伟良,张城镇,张绪坤,李冀,朱保利,辛文才,陈仕.污泥热泵低温干化技术优势与问题探讨[J].环境工程,2021,39(2):121-124. |
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| 作者姓名： | 傅伟良 张城镇 张绪坤 李冀 朱保利 辛文才 陈仕 |
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| 作者单位： | 南昌航空大学 环保装备技术研究所, 南昌 330063 |
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| 基金项目： | 国家自然科学基金"污泥干燥环形快速加热防粘附机理及MVR热泵耦合运行特性研究"（51868053）；废水污泥低压过热蒸汽耦合MVR热泵高效节能干燥技术及关键设备研究（20181ACG70024）。 |
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| 摘 要： | 污泥的显著特征是含水率高和黏度大，机械脱水污泥含水率在80%左右。由于其含水率高，体积庞大，为污泥处理处置带来了经济和技术上的困难。降低污泥含水率是无害化、减量化处理的关键和资源化利用的前提。加热干化是污泥深度脱水最有效方法之一，但传统热风对流干燥存在效率低、能耗高及尾气处理难度大等问题。热泵干燥是近年来开发的1种污泥低温干化新技术，具有能耗低、干化过程易于控制及安全性能高的优点。但需考虑进入干燥机的污泥颗粒大小及稳定性，协调污泥颗粒内部与外部传热传质，并处理好干燥过程中的粉尘及腐蚀性气体对热泵换热器的影响。
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| 关 键 词： | 污泥 热泵 低温干化 技术优势 |
| 收稿时间： | 2020-05-18 |
DISCUSSION ON THE EXISTING PROBLEMS AND ADVANTAGES OF HEAT PUMP LOW TEMPERATURE DRYING OF SLUDGE |
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| Affiliation: | Environmental Protection Equipment Technology Research Institute, Nanchang Hangkong University, Nanchang 330063, China |
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| Abstract: | The outstanding characteristics of sewage sludge are the high moisture content. The moisture of sewage sludge cake after mechanical dewatering is still as high as 80%. It is difficult to sewage sludge treatment both efficiently and economically, due to its high moisture content and bulkiness. However, decreasing the moisture content of sludge is the crux of the matter in harmlessness and bulkiness reduction, which is also the premise of resource utilization. Heating drying is one of the most effective methods of sludge deep dehydration, but the traditional hot air convection drying has many problems, such as low efficiency, high energy consumption and difficult tail gas treatment. Heat pump drying is a new technology of sludge low temperature drying, which has the advantages of low energy consumption, easy control of drying process and high safety performance. However, it is necessary to consider the size and stability of the sludge particles entering the dryer, coordinate the heat and mass transfer inside and outside the sludge particles, and deal with the impact of the dust and corrosive gas in the drying process on the heat pump heat exchanger. |
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