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全混式厭氧反應器攪拌方式分析與優(yōu)化
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國家自然科學基金資助項目（51078287）;“十一五”國家科技支撐計劃資助項目（2008BADC4B05,、2008BAJ08B0);上海市科委資助項目（07DZ12050）;上海市科委科技發(fā)展基金資助項目 (09391910700)


Analysis and Optimization of Different Mixing Method in Completly Mixed Digesters
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    摘要:

    采用流體動力學模型對全混式厭氧反應器內的流場進行三維穩(wěn)態(tài)數(shù)值模擬,。研究攪拌器不同安裝方式對上層和下層擾動的影響,，以達到消除上層結殼和擾動下部污泥層的目的,。結果顯示,，單純提高攪拌器的安裝高度難以改善運行情況。雙層攪拌方式下,，4.3m層流速較原始安裝位置可提高90.90%,，0.2m層流速可提高20.94%。工程實踐表明,，改造后的攪拌方式可以有效減少浮渣,，同時擾動污泥，提高運行效率,。

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    The characteristics of the flow field in completly mixed biogas digester were studied by computational fluid dynamics (CFD). Effects of different installation way of agitator to the disturbances in the upper and lower layer were analyzed. The results showed that increasing of agitator mounting height was difficult to improve the flow. Therefore, the double-mixing was used in the biogas digesters. Compared to the original installation, flow speed could increase by 90.90% in the 4.3m layer and 20.94% in the 0.2m layer with the double-mixing. The actual project also showed that this modified method could reduce scum, disturb sludge and improve operational efficiency.

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朱洪光,畢峻瑋,石惠嫻.全混式厭氧反應器攪拌方式分析與優(yōu)化[J].農業(yè)機械學報,2011,42(6):127-131,137. Zhu Hongguang, Bi Junwei, Shi Huixian. Analysis and Optimization of Different Mixing Method in Completly Mixed Digesters[J]. Transactions of the Chinese Society for Agricultural Machinery,2011,42(6):127-131,137.

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