A new torrefaction system employing spontaneous self-heating of livestock manure under elevated pressure
A new torrefaction system employing spontaneous self-heating of livestock manure under elevated pressure
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DOI：
10.1016/j.wasman.2018.12.018
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发表时间：
2019-02-15
期刊：
影响因子：
8.1
通讯作者：
Taniguro, Katsumori
中科院分区：
文献类型：
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作者：
Itoh, Takanori;Iwabuchi, Kazunori;Taniguro, Katsumori
该报告描述了一种新的氧化烘焙方法，该方法利用原料的自发自加热作为克服将牲畜粪便转化为生物炭的实际困难的手段。我们研究了在1.0 MPa压力下引发湿奶牛粪便自加热所需的起始温度，并对200、250和300℃制备的固体产物进行了元素和热分析。自加热在100℃以下开始氧化，起始温度的下限在85至90℃之间。比较在0.1和1.0 MPa下进行的过程，较高压力通过防止在大约 100 摄氏度时发生水分蒸发而造成的热量损失以及向高水分原料提供氧气来促进自加热。此外，由于过程中干燥温度为160-170摄氏度，因此系统不需要预干燥或后干燥。虽然固体产品的热值由于高灰分含量而降低，但产品的元素组成改变为泥炭类（200℃）和褐煤类（250℃和300℃）材料。建议在大约 250 摄氏度时停止粪便的自加热，以避免在更高温度下严重分解。总的来说，这些结果证明了所提出的通过自加热将湿粪肥转化为干燥生物炭的方法的实用性以及在粪肥管理系统中的潜在应用。 (C) 2018 Elsevier Ltd. 保留所有权利。
This report describes a new oxidative torrefaction method employing spontaneous self-heating of feed-stock as a means of overcoming practical difficulties in converting livestock manure to biochar. We examined the initiating temperature required to induce self-heating of wet dairy cattle manure under 1.0 MPa pressure and conducted elemental and calorific analyses of the solid products prepared at 200, 250, and 300 degrees C. Self-heating was initiated with oxidation below 100 degrees C, and the lower limit of the initiation temperature was between 85 and 90 degrees C. Comparing processes performed at 0.1 and 1.0 MPa, the higher pressure promoted self-heating by both preventing heat loss due to moisture evaporation occurring at approximately 100 degrees C and supplying oxygen to the high-moisture feedstock. In addition, as drying occurred at 160-170 degrees C during the process, the system did not require pre- or post-drying. Although the heating values of the solid products decreased due to high ash content, the elemental composition of the products was altered to that of peat-like (200 degrees C) and lignite-like (250 and 300 degrees C) materials. Cessation of self-heating of the manure is recommended at approximately 250 degrees C to avoid severe decomposition at higher temperatures. Overall, these results demonstrated the utility of the proposed method for converting wet manure into dried biochar through self-heating as well as potential applications in manure management systems. (C) 2018 Elsevier Ltd. All rights reserved.