Energy valorization of cow manure by hydrothermal carbonization and anaerobic digestion
Energy valorization of cow manure by hydrothermal carbonization and anaerobic digestion
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DOI：
10.1016/j.renene.2020.07.003
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发表时间：
2020-11-01
期刊：
影响因子：
8.7
通讯作者：
de la Rubia, M. A.
中科院分区：
文献类型：
--
作者：
Marin-Batista, J. D.;Villamil, J. A.;de la Rubia, M. A.
通过对牛粪加氢焦的热分析和工艺水的厌氧消化(AD)，对牛粪水热碳化(HTC)的能量回收进行了评价。在170-230℃范围内，HTC温度的升高改善了牛粪的固体燃料性质(较高的热值(16.4-20.1MJ kg(-1))和燃料比(0.19-0.33))，但由于加氢焦产率(65.0-54.0%)的降低，其燃烧所能回收的能量较少。固定碳含量(12.5-18.7%)、点火(263-278摄氏度)和燃尽(581-619摄氏度)温度随着碳化温度的升高而升高，从而降低火灾和爆炸的风险。然而，与良好的燃料特性相关的综合燃烧指数在170℃碳化的加氢焦时达到最高值。PW的高有机质含量允许通过AD回收能量，在170℃产生的PW获得最高的甲烷产率(294+/-2毫升STP CH4 g(-1)VS)。与常规AD相比，HTC的能量利用率更高(4.1MJ kg(-1))。AD回收的能量与加氢半焦(13.7MJ kg(-1)HTC条件下200℃以下的原料)的能量含量结合在一起，约占原料总能量含量的85%，这为奶牛粪便提供了一条潜在的价态途径。(C)2020爱思唯尔有限公司。保留所有权利。
The work evaluates the energy recovery from hydrothermal carbonization (HTC) of cow manure through the thermal analysis of hydrochar and the anaerobic digestion (AD) of the process water (PW). The increase of the HTC temperature in the range of 170-230 degrees C improved solid-fuel properties (higher heating value (16.4-20.1 MJ kg(-1)), fuel ratio (0.19-0.33)) of dairy manure, but less energy can be recovered by its combustion ascribing to reduction of hydrochar yield (65.0-54.0%). Fixed carbon content (12.5-18.7%), and ignition (263-278 degrees C) and burnout (581-619 degrees C) temperatures increased with carbonization temperature, thereby reducing risks of fire and explosion. However, the highest value of the comprehensive combustion index, related with good fuel characteristics, was obtained for the hydrochar carbonized at 170 degrees C. The high organic matter content of the PW allows energy recovery by AD, obtaining the highest methane yield for the PW generated at 170 degrees C (294 +/- 2 mL STP CH4 g(-1) VSadded). HTC led to higher energy recovery than conventional AD of dairy manure (4.1 MJ kg(-1)). The energy recovery by AD combined with the energy content of the hydrochar (13.7 MJ kg(-1) feedstock for HTC conditions below 200 degrees C) accounted around 85% of the total energy content of feedstock, allowing a potential valorization route for dairy manure. (C) 2020 Elsevier Ltd. All rights reserved.