University of Hohenheim, State Institute of Agricultural Engineering and Bioenergy, Garbenstr. 9, Stuttgart 70599, Germany.
University of Hohenheim, State Institute of Agricultural Engineering and Bioenergy, Garbenstr. 9, Stuttgart 70599, Germany.
Bioresour Technol. 2021 Jul;332:125099. doi: 10.1016/j.biortech.2021.125099. Epub 2021 Apr 9.
This work studied the demand-oriented biogas production and the biogas storage in digestate by flexibly feeding a full-scale research biogas plant. The investigated continuous stirred tank reactor (CSTR) was equipped with a fast-moving submersible motor mixer and a slow-moving inclined shaft agitator. A model for the biogas storage in digestate was introduced and tested in full scale using temporally highly resolved volume flow measurements. An increase in mixing time led to a faster biogas production: A two to five hours reduction of the time to reach the maximum biogas production after feeding occurred in our experiments. However, no influence of the rheology and of the mixing regime on the methane yield could be derived from the measurements. Further, a 30% reduction of the stored biogas in the digestate occurred when the viscosity was lowered by 66%. This knowledge can be used to enhance the existing biogas formation models.
本工作研究了通过灵活进料全规模研究沼气厂的面向需求的沼气生产和消化物中的沼气储存。所研究的连续搅拌槽式反应器（CSTR）配备了快速移动的潜水式电机搅拌器和慢速倾斜轴搅拌器。引入了一种用于消化物中沼气储存的模型，并使用时间分辨率高的体积流量测量在全规模上进行了测试。混合时间的增加导致沼气生产更快：进料后达到最大沼气产量的时间减少了两到五个小时。然而，从测量结果中无法得出流变学和混合状态对甲烷产量的影响。此外，当粘度降低 66%时，消化物中储存的沼气减少了 30%。这一知识可用于增强现有的沼气生成模型。
