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Modeling temperature variations in a pilot plant thermophilic anaerobic digester

机译：模拟中试高温厌氧消化池中的温度变化

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摘要

A model that predicts temperature changes in a pilot plant thermophilic anaerobic digester was developed based on fundamental thermodynamic laws. The methodology utilized two simulation strategies. In the first, model equations were solved through a searching routine based on a minimal square optimization criterion, from which the overall heat transfer coefficient values, for both biodigester and heat exchanger, were determined. In the second, the simulation was performed with variable values of these overall coefficients. The prediction with both strategies allowed reproducing experimental data within 5% of the temperature span permitted in the equipment by the system control, which validated the model. The temperature variation was affected by the heterogeneity of the feeding and extraction processes, by the heterogeneity of the digestate recirculation through the heating system and by the lack of a perfect mixing inside the biodigester tank. The use of variable overall heat transfer coefficients improved the temperature change prediction and reduced the effect of a non-ideal performance of the pilot plant modeled.
机译：基于基本热力学定律，开发了预测中试嗜热厌氧消化池中温度变化的模型。该方法利用了两种模拟策略。首先，通过基于最小平方优化准则的搜索例程求解模型方程，从而确定生物消解器和热交换器的总传热系数值。在第二步中，使用这些总系数的可变值执行模拟。两种策略的预测都可以在系统控制允许的设备温度允许范围内的5％范围内重现实验数据。温度变化受进料和萃取过程的不均匀性，通过加热系统的消化物再循环的不均匀性以及生物消化池内部缺乏完美混合的影响。可变的总传热系数的使用改善了温度变化的预测，并降低了模拟中试工厂的非理想性能的影响。

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