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Effect of solar irradiance on photo biochemical transformation process of direct absorption methane digester

机译：太阳辐射对直接吸收式沼气池光生化转化过程的影响

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Direct absorption methane digester can accomplish the coupled process of solar heat collection and photo and biochemical reaction of microorganisms simultaneously. In present work, a numerical model was developed to determine a tool to investigate the photo biochemical transformation process for developing engineering analyses, which is a coupled one of the simplified ADM1 model and the heat and mass transfer model. The model was validated by experimental data from two groups of different experiments. The effect of solar irradiance on the photo biochemical transformation process was also investigated by the model. The results show that a good agreement has been obtained between experimental data and simulations, which can be achieved in most of time. The study found that increasing solar irradiance is an effective method to improve the biogas production rate of direct absorption methane digester. With the solar irradiance increasing, the volume average temperature increases and the rates of biogas production, substrate reaction and total propionate all turn bigger. The effect of solar irradiance on biogas production rate is bigger than the one on the rate of propionic acid. In order to increase the heat storage of digester, the slurry surface evaporation of digester should be restrained.
机译：直接吸收式沼气池可以同时完成太阳能集热与微生物的光生化反应的耦合过程。在当前的工作中，开发了一个数值模型来确定研究光生化转化过程以进行工程分析的工具，该模型是简化的ADM1模型与传热传质模型的耦合之一。通过两组不同实验的实验数据验证了该模型。该模型还研究了太阳辐照度对光生化转化过程的影响。结果表明，在实验数据和仿真之间已经获得了很好的一致性，这在大多数时间都可以实现。研究发现，增加太阳辐照度是提高直接吸收式沼气池沼气产生率的有效方法。随着太阳辐照度的增加，体积平均温度升高，沼气产生率，底物反应率和总丙酸酯率都变大。太阳辐照度对沼气产生率的影响大于对丙酸率的影响。为了增加蒸煮器的蓄热能力，应限制蒸煮器的浆液表面蒸发。

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