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Flexible Energy from Biogas: Use of Secondary Digesters for Heat Storage—Results of Fermentation Tests
Clean - Soil Air Water ( IF 1.5 ) Pub Date : 2021-06-08 , DOI: 10.1002/clen.202000373 Ingolf Seick 1 , Mónica Vergara‐Araya 1 , Jürgen Wiese 1
Clean - Soil Air Water ( IF 1.5 ) Pub Date : 2021-06-08 , DOI: 10.1002/clen.202000373 Ingolf Seick 1 , Mónica Vergara‐Araya 1 , Jürgen Wiese 1
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A process for a more efficient and flexible use of the produced heat in biogas plants is tested under real operational conditions. The process uses a mesophilic digester and a thermophilic secondary digester, and the heat demand of the plant is covered by using the heat stored in the secondary digester. The efficient heat use is achieved by a controlled variation of temperature in combination with a suitable process monitoring, without affecting the biogas production or disturbing the biological process. The concept was previously tested in ideal laboratory conditions. Here, the validation tests, in preparation for a planned large-scale trial, comprising one-year semicontinuous fermentation tests in the laboratory (close to real operational conditions) are presented. These real conditions are characterized by a high organic load of the reactors as well as by a more manifold substrate mix. During the experimental phase, it is determined that the maximum temperature, at high variation rates between −4 and +2 K per day, reaches 54 °C, allowing a stable process. These experiments confirm that the adaptability to temperature changes depends on the boundary conditions of the fermentation and case-specific experiments are required before significant changes are made to the temperature management of anaerobic digestion systems.
中文翻译：
来自沼气的灵活能源：使用二次消化器进行蓄热——发酵测试结果
在实际操作条件下测试了一种更有效、更灵活地利用沼气厂产生的热量的过程。该工艺使用中温蒸煮器和高温二次蒸煮器，利用二次蒸煮器中储存的热量满足工厂的热量需求。通过控制温度变化并结合适当的过程监控来实现有效的热量利用，而不会影响沼气的产生或干扰生物过程。该概念之前在理想的实验室条件下进行了测试。这里介绍了为计划中的大规模试验做准备的验证测试，包括在实验室中进行的为期一年的半连续发酵测试（接近实际操作条件）。这些真实条件的特点是反应器的高有机负荷以及更多的底物混合物。在实验阶段，确定最高温度在每天 -4 和 +2 K 之间的高变化率下达到 54°C，从而实现稳定的过程。这些实验证实，对温度变化的适应性取决于发酵的边界条件，在对厌氧消化系统的温度管理进行重大改变之前，需要进行具体的实验。
更新日期：2021-06-08
中文翻译：
来自沼气的灵活能源：使用二次消化器进行蓄热——发酵测试结果
在实际操作条件下测试了一种更有效、更灵活地利用沼气厂产生的热量的过程。该工艺使用中温蒸煮器和高温二次蒸煮器，利用二次蒸煮器中储存的热量满足工厂的热量需求。通过控制温度变化并结合适当的过程监控来实现有效的热量利用，而不会影响沼气的产生或干扰生物过程。该概念之前在理想的实验室条件下进行了测试。这里介绍了为计划中的大规模试验做准备的验证测试，包括在实验室中进行的为期一年的半连续发酵测试（接近实际操作条件）。这些真实条件的特点是反应器的高有机负荷以及更多的底物混合物。在实验阶段，确定最高温度在每天 -4 和 +2 K 之间的高变化率下达到 54°C，从而实现稳定的过程。这些实验证实，对温度变化的适应性取决于发酵的边界条件，在对厌氧消化系统的温度管理进行重大改变之前，需要进行具体的实验。
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