论文部分内容阅读
文章以校园餐厨垃圾为原料,以水热炭化的方法处理餐厨垃圾,对得到的水热炭化固体产物生物煤的特性参数进行测定,得出生物煤的热值及灰分均达到GB/T 17608-2006精煤的一级标准。通过3水平3因素正交试验,对水热炭化工艺条件进行优化,得到影响因素的主次顺序为温度>pH>反应时间,合适的工艺条件为180℃,pH为4,反应时间为3 h。在温度160~220℃范围内,随着反应温度的增高,生物煤的热值增加,而其转化率则是先增高,后趋于平缓,最后急速下降。在优化工艺条件下对餐厨垃圾进行水热炭化,得到生物煤热值为30.18 MJ/kg,转化率为54.08%。对餐厨垃圾及优化条件下得到的生物煤进行元素分析,得出经过水热炭化后,碳的质量百分含量从49.00%提高到65.93%,而氧元素的质量分数降低了17.98%。同时,水热炭化改变了餐厨垃圾的极性及芳香性。
The article takes school food waste as raw material and treats food waste by means of hydrothermal carbonization, and determines the characteristic parameters of biological coal obtained from the hydrothermal carbonization solid product, and finds that the calorific value and ash content of biological coal reach GB / T Primary standard of clean coal. The orthogonal experiment of 3 levels and 3 factors was used to optimize the conditions of hydrothermal carbonization. The main order of influencing factors was temperature> pH> reaction time. The suitable process conditions were 180 ℃, pH 4 and reaction time 3 h . In the temperature range of 160 ~ 220 ℃, with the increase of the reaction temperature, the calorific value of biochar increases, while the conversion rate increases first and then tends to be gentle, and finally decreases sharply. Hydrothermal carbonization of food wastes under optimized process conditions resulted in a heating value of 30.18 MJ / kg and a conversion rate of 54.08%. Elemental analysis of food waste and bio-coal obtained under optimized conditions showed that after hydrothermal carbonization, the mass percentage of carbon increased from 49.00% to 65.93%, while the oxygen content decreased by 17.98%. At the same time, hydrothermal carbonization has changed the polarity and aromaticity of food waste.