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Effects of operating parameters and injection method on the performance of an artificial upwelling by using airlift pump

机译:运行参数和注射方法对使用Airlift泵的人工升值性能的影响

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摘要

Artificial upwelling by using airlift pump is considered a sustainable way in actualizing ocean fertilization, which could potentially alleviate the pressures on the fish stocks and human-driven climate change. However, few experimental data about the effects of operating parameters and injection method on the performance of the airlift artificial upwelling were found in the literature. In this paper, an airlift pump for artificial upwelling was investigated through three field experiments, in which airlift pumps of pipe length ranges from 20 to 28.3 m and pipe diameter ranges from 0.4 to 2 m, were designed and tested. Pumped water flow rate and injected air flow rate were measured to study the effects of different factors on the performance of airlift pump. The experiment results show that airlift pump efficiency is closely related to pipe diameter, submerged depth, submergence ratio and nozzle designs. There is no best nozzle for all the range of air flow rate, and the recommended nozzles are double-ring-shaped or star-shaped nozzles when the air flow rate is less or more than 220 L/min, respectively. Moreover, the lift effectiveness increases when the hole size of nozzle is enlarged, which indicates a relatively large bubble size will enhance the lift effectiveness.
机译:使用Airlift Pump的人工上升措施被认为是一种可持续的方式,实现海洋施肥,这可能会缓解鱼类库存的压力和人类驱动的气候变化。然而,关于操作参数和注射方法对空运人工升值性能的影响很少的实验数据。本文通过三个现场实验研究了用于人工升值的空运泵,其中设计并测试了由20至28.3米的管道长度的空运泵为20至28.3米,管道直径范围为0.4至2μm。测量泵浦水流速和注入的空气流量,以研究不同因素对空运泵性能的影响。实验结果表明,空运泵效率与管道直径,浸没深度,淹没比和喷嘴设计密切相关。对于所有空气流速范围没有最佳喷嘴,并且当空气流速分别较小或大于220L / min时,推荐的喷嘴是双环形或星形喷嘴。此外,当喷嘴的孔尺寸扩大时,提升效果增加,这表明了相对大的气泡尺寸将提高提升效果。

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