College of Engineering, Northeast Agricultural University, Harbin 150030, PR China; Key Laboratory of Agricultural Renewable Resources Utilization Technology and Equipment in Cold Areas of Heilongjiang Province, Harbin 150030, PR China; Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, PR China.
College of Engineering, Northeast Agricultural University, Harbin 150030, PR China; Key Laboratory of Agricultural Renewable Resources Utilization Technology and Equipment in Cold Areas of Heilongjiang Province, Harbin 150030, PR China.
Bioresour Technol. 2021 Feb;321:124460. doi: 10.1016/j.biortech.2020.124460. Epub 2020 Dec 5.
An outdoor anaerobic fermentation reactor loses a significant amount of energy due to heat dissipation to the surrounding environment. The digester of direct absorption biogas can effectively utilize solar energy and scattering of the medium to enhance reaction temperature, which can promote anaerobic fermentation of microorganisms. A numerical model for the direct absorption methane digester was established to investigate the mechanism of photo biochemical transformation. The average relative values of simulated results were 4.1% and 9.6%, indicating that the model can effectively simulate the heat transfer process of biogas slurry under solar irradiation. Decreasing the albedo and increasing the effect of forward scattering of small particles can improve the regenerative performance and biogas production of digester. Increasing the backward scattering effect of small particles limited biogas fermentation. Scattering distribution had bigger effects on the rates of biogas and propionic acid production than those of albedo.
由于向周围环境散热，户外厌氧发酵反应器会损失大量能量。直接吸收沼气消化器可以有效地利用太阳能和介质的散射来提高反应温度，从而促进微生物的厌氧发酵。建立了直接吸收甲烷消化器的数值模型，以研究光生化转化的机制。模拟结果的平均相对值分别为 4.1%和 9.6%，表明该模型可以有效地模拟太阳能照射下沼气浆的传热过程。降低反照率和增加小颗粒正向散射的效果可以提高消化器的再生性能和沼气产量。增加小颗粒的后向散射效果限制了沼气发酵。与反照率相比，散射分布对沼气和丙酸产生率的影响更大。
