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- 저자 : Longlong Gao (검색결과 2 건)
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Gao Longlong,Xu Wentao,Li Baoren 유공압건설기계학회 2015 유공압건설기계학회 학술대회논문집 Vol.2015 No.10
The high-pressure electro-pneumatic servo valve (HESV) is a crucial element for the high-pressure pneumatic servo system. The internal leakage at the null position of the HESV is an important factor to the control accuracy and dynamic characteristics of the high-pressure pneumatic servo system. In this paper, the micro flow behavior of the high-pressure air at the null position of the HESV is evaluated and analyzed by means of computational fluid dynamics (CFD). The effect of annular clearance between the valve spool and sleeve, slightly rounded edges of the valve spool on the micro flow behavior is investigated. Based on the numerical results, the flow characteristics at null position of a direct drive HESV is studied. The numerical results show that the leakage flow rate are strong nonlinear with the valve openings of less than 50 μm, although varies linearly with the increasing supply pressure. The height of the annular clearance and the rounded corner radius cannot be ignored during the high-pressure electro-pneumatic servo system.
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The characteristics and application of grain-slag media in a biological aerated filter (BAF)
Yan Feng,Liping Qiu,Jianwei Zhang,Longlong Gao,Yanzhen Yu 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.3
Novel filter media-grain slag particles were prepared using waste material-grain slag, clay and poreforming material with a mass ratio of 3:2:1. Compared with haydite, grain-slag had higher total porosity,larger total surface area and lower bulk and apparent density. Tests of heavy metal elements in lixivium proved that grain-slag were safe for wastewater treatment. In order to ascertain the application of grainslag,grain-slag and haydite were applied as the media of biological aerated filters (BAF) to treat municipal wastewater in two lab scale upflow BAFs. The results showed that grain-slag reactor brought a relative superiority to haydite reactor in terms of chemical oxygen demand (CODcr) and ammonia nitrogen (NH3-N) removal at the conditions of water temperature ranging from 20 8C to 26 8C and DO 4.00 mg L1 when hydraulic retention time (HRT) ranging from 1 h to 5 h. In addition, the detection of the amount of hetero bacteria and nitrobacteria of two biological aerated filters in three HRTs also showed that grain-slag medium was more suitable to the attached growth of nitrobacteria, which is helpful to the improvement of nitrification performance in grain-slag BAF. Therefore, grain-slag application in BAF, as a novel process of treating wastes with wastes, provided a promising way in grain slag waste material utilization.
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