| 基于质能流评估的餐厨垃圾热解自供能特性研究 |
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| 引用本文： | 侯林桐,杨学忠,李健,颜蓓蓓,陈冠益.基于质能流评估的餐厨垃圾热解自供能特性研究[J].环境工程,2022,40(12):37-45. |
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| 作者姓名： | 侯林桐 杨学忠 李健 颜蓓蓓 陈冠益 |
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| 作者单位： | 1. 天津大学 环境科学与工程学院, 天津 300350; |
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| 基金项目： | 国家重点研发计划课题(2019YFD1100305) |
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| 摘 要： | 餐厨垃圾具有成分复杂、含水率高的特点,热解处理法虽可实现餐厨垃圾的快速、无害化减量和能源资源回用,但其处理过程依赖外部能量输入,处理过程的能量平衡问题不容忽视。为全面探究餐厨垃圾热解系统能量流分布,研究提出了热解产物燃烧回用思路,聚焦系统自供能特性,开展固定床热解实验,考察不同含水率的餐厨垃圾在不同热解温度下的产物分布,并计算理论热值,结合TG-DSC分析确定原料热解理论耗能,建立了系统自供能特性指标(ERPC),计算系统的能量产生与消耗比,判断餐厨垃圾热解自供能的运行条件。结果表明:热解温度由400 ℃升至800 ℃,餐厨垃圾热解固体产物产率降低,气体产率提高,热解油产率呈现先增后减的趋势,并在500 ℃时达到最高。通过产物热值分析,过高的热解温度和含水率降低了餐厨垃圾热解产物的总能量。当三相热解产物全部燃烧回用时,为实现系统自供能餐厨垃圾含水率不得低于40%,热解温度不得高于500 ℃。当将油、气两相产物燃烧回用时,为实现系统自供能,热解温度须不超过600 ℃,含水率不超过10%。只燃烧热解气在所有条件下均无法实现系统自供能。
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| 关 键 词： | 餐厨垃圾 热解特性 燃烧 自供能 |
| 收稿时间： | 2022-07-27 |
SELF-POWER PROPERTY OF PYROLYSIS OF KITCHEN WASTE: AN INVESTIGATION ON THE MASS AND ENERGY FLOW |
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| Affiliation: | 1. School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China;2. School of Mechanical Engineering, Tianjin University of Commerce, Tianjin 300134, China |
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| Abstract: | Food waste has a complex composition and high moisture content. Although the pyrolysis process can achieve fast, harmless reduction and energy reuse of food waste, the process highly relies on external energy input. Thus the mass and energy evaluation for the pyrolysis process is very important. In this work, the mass distribution and energy flow for the pyrolysis of food waste were comprehensively investigated. We tried to achieve self-powered prolysis by burning the pyrolytic products. The pyrolysis experiments were conducted in a lab-scale fixed-bed reactor, and the influence of moisture on food waste and pyrolysis temperature was investigated. Moreover, based on the results of TG-DSC, an index (ERPC) was built for evaluating the potential of self-power. Results showed that when the temperature increased from 400 ℃ to 800 ℃, the solid product of pyrolysis decreased while the gaseous product increased. The liquid product increased firstly then decrease, and peaked at 500 ℃. Based on the analysis of the heating value of the products, the high pyrolysis temperature and moisture content weakened energy production. If all of the pyrolysis products (gas, oil and char) were burned, the moisture content of food waste should be lower than 40% for achieving self-power, and the pyrolysis temperature should be lower than 500 ℃. If only burning gas and oil products, the pyrolysis temperature should be lower than 600 ℃, and the moisture content lower than 10%. However, self-power can never be achieved under any conditions, if only burning prolysis gas. |
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