运行参数对倒伞曝气机曝气性能影响试验

发布时间：2018-06-13 14:42

本文选题：压力 + 水　；参考：《农业工程学报》2017年20期

【摘要】：转速、浸没深度和液位高度对倒伞曝气机曝气性能的影响较大,为了研究各影响参数协同作用下倒伞曝气机曝气性能的变化情况,该文通过试验研究了不同转速、浸没深度和液位高度对曝气性能的影响。研究表明:在相同转速时随着运行时间的增加曝气池溶解氧浓度随之增大,但增幅逐渐降低;随着转速的增加,叶轮对水的做功能力增强,提高了水面的湍动强度及水面下的复氧强度,进而缩短了曝气池达到氧饱和的时间,转速为300 r/min达到氧饱和的时间比150 r/min缩短了约57%。转速、浸没深度和液位高度的改变均会极大地影响倒伞曝气机的性能:转速的增加能够提升倒伞曝气机的标准氧总转移系数和标准充氧能力,但对于标准动力效率的提升有一个上限值,该上限值与浸没深度有关;倒伞曝气机低速运行时,浸没深度和液位高度对标准氧总转移系数和标准充氧能力的影响较小。液位高度的增加会加大倒伞曝气机的标准充氧能力和标准动力效率,但是相同液位高度下,随着转速的增加标准动力效率增幅明显小于标准充氧能力增幅,当液位高度为250 mm时,转速从150增加到300 r/min,标准充氧能力值提高2.91倍而标准动力效率提高1.22倍。该研究可为倒伞曝气机的经济运行提供参考。
[Abstract]:Rotating speed, immersion depth and liquid level height have great influence on aeration performance of inverted umbrella aerator. In order to study the change of aeration performance of inverted umbrella aerator under the synergistic action of various influence parameters, different rotational speeds are studied through experiments in this paper. Effects of immersion depth and liquid level height on aeration performance. The results show that the dissolved oxygen concentration of aeration tank increases with the increase of running time at the same speed, but the increase decreases gradually, and the work ability of impeller to water increases with the increase of rotating speed. The turbulent intensity of water surface and the reoxygenation intensity of water surface are increased, and the time of oxygen saturation in aeration tank is shortened by 57% than that of 150 r/min at rotational speed of 300 r/min. The change of rotational speed, immersion depth and liquid level height will greatly affect the performance of the inverted parachute aerator: the increase of rotational speed can enhance the total standard oxygen transfer coefficient and the standard oxygen filling capacity of the inverted umbrella aerator. However, there is an upper limit for the improvement of standard dynamic efficiency, which is related to the depth of immersion, and the depth of immersion and the height of liquid level have little effect on the total transfer coefficient of standard oxygen and the standard oxygenation capacity when the inverted umbrella aerator is running at low speed. The increase of liquid level height will increase the standard oxygenation capacity and standard power efficiency of the inverted parachute aerator, but at the same liquid level, the increase of standard power efficiency with the increase of rotational speed is obviously smaller than the increase of standard oxygenation capacity. When the height of liquid level is 250 mm, the rotational speed increases from 150 to 300 r / min, the standard oxygenation capacity increases by 2.91 times and the standard dynamic efficiency increases by 1.22 times. The research can provide a reference for the economic operation of the inverted umbrella aerator.
【作者单位】：江苏大学国家水泵及系统工程技术研究中心;南京贝特环保通用设备制造有限公司;
【基金】：江苏省产学研联合创新资金-前瞻性联合研究项目(BY2016072-01) 江苏省“六大人才高峰”高层次人才项目(GDZB-017) 江苏高校优势学科建设工程资助项目PAPD(苏政办发2011 6号) 中国博士后科学基金资助项目(2015M581734)
【分类号】：X703

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