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

Qiang, Yongfa; Fan, Wei; Xiao, Canbo; Pan, Yiwen; Chen, Ying

doi:10.1016/j.apor.2018.06.006

Cited by 22 publications

(10 citation statements)

References 21 publications

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“…In [5] steady and pulsating injection modes with the use of four air distributor geometry namely radial, axial, dual and swirl were analysed. The authors in [6] propose the application of four types of the nozzle (point, star, ring, double-ring) for artificial upwelling systems. Different angles of the gas distributor installation were investigated in [7].…”

Section: Introductionmentioning

confidence: 99%

A New Method of Selecting the Airlift Pump Optimum Efficiency at Low Submergence Ratios with the Use of Image Analysis

Ligus

Zając²,

Masiukiewicz

et al. 2019

Energies

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This paper presents experimental studies on the optimization of two-phase fluid flow in an airlift pump. Airlift pumps, also known as mammoth pumps, are devices applied for vertical transport of liquids with the use of gas. Their operating principle involves the existence of a density gradient. This paper reports the results of experimental studies into the hydrodynamic effects of the airlift pump. The studies involved optical imaging of two-phase gas-liquid flow in a riser pipe. The visualization was performed with high-speed visualization techniques. The studies used a transparent model of airlift pump with a rectangular cross-section of the riser. The assessment of the airlift pump operation is based on the image grey-level analysis to provide the identification of two-phase flow regimes. The scope of the study also involved the determination of void fraction and pressure drops. The tests were carried out in a channel with dimensions 35 × 20 × 2045 mm with the gas flux range 0.2–15.0 m3/h. For the assessment of the two-phase flow pattern Probability Density Function (PDF) was applied. On the basis of the obtained results, a new method for selecting the optimum operating regime of airlift pump was derived. This method provides the finding of stability and efficiency of liquid transport. It can also be applied to determine the correlation between the total lifting efficiency and the required gas flux for proper operation of the airlift pump.

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Section: Introductionmentioning

confidence: 99%

A New Method of Selecting the Airlift Pump Optimum Efficiency at Low Submergence Ratios with the Use of Image Analysis

Ligus

Zając²,

Masiukiewicz

et al. 2019

Energies

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“…In this experiment, the pneumatic lifting method was used to generate the upwelling. The same method was used in the upwelling experiments conducted by Zhejiang University in QiandaoLake, China in October 2011 and December 2012 [24,25]. As displayed in Figure 6a, we designed a gas injection frame consisting of three concentric water pipe rings with a maximum diameter of 3 m. The pipe rings were made of irregular copolymer polypropylene.…”

Section: Methodsmentioning

confidence: 99%

Water Temperature Observation by Coastal Acoustic Tomography in Artificial Upwelling Area

Huang

Guo

Wang

et al. 2019

Sensors

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Artificial upwelling is a geoengineering method to repair and improve marine ecosystems, and its operation requires long-term and continuous temperature field observation. However, existing methods are rarely seen to accomplish such observation. In this study, we investigate the coastal acoustic tomography (CAT) to obtain the long-term horizontal temperature field of an artificial upwelling area in an anechoic tank. We conduct four sets of experiments with different CAT station numbers and compare their data with those collected from temperature sensors. By analyzing the travel time from the CAT experiments, the horizontal temperature field of the upwelling area could be mapped. The CAT results and the comparison results show that the surface temperature of the observed area decreases by approximately 3 °C after upwelling, while the temperature of where the CAT is deployed decreases by about 1 °C; the temperature is lowest at the center of the upwelling area. Increasing the number of stations and station spacing would improve the temperature mapping accuracy. Therefore, the feasibility of using the CAT system to observe artificial upwelling is proved valid. This study indicates the potential application of CAT in temperature field observation in artificial upwelling area in the sea.

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“…If the plume height cannot reach the kelp culture area, the upwelling is invalid. There has been some research on the behavior of plume in air-injection artificial upwelling [21,31,32]. Of the three variables, target height of plume, flow velocity, and air injection rate, any two variables are known and another variable can be obtained.…”

Section: Local Controllermentioning

confidence: 99%

Energy Management and Operational Planning of an Ecological Engineering for Carbon Sequestration in Coastal Mariculture Environments in China

et al. 2019

Self Cite

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China is now accelerating the development of an ecological engineering for carbon sequestration in coastal mariculture environments to cope with climate change. Artificial upwelling as the ecological engineering can mix surface water with bottom water and bring rich nutrients to the euphotic zone, enhance seaweed growth in the oligotrophic sea area, and then increase coastal carbon sequestration. However, one of the major obstacles of the artificial upwelling is the high energy consumption. This study focused on the development of energy management technology for air-lift artificial upwelling by optimizing air injection rate. The fundamental principle underlying this technology is that the mode and intensity of air injection are adjusted from the feedback of information on velocity variation in tidal currents, illumination, and temperature of the surface layer. A series of equations to control air injection was derived based on seaweed growth and solar power generation. Although this finding was originally developed for the air-lift artificial upwelling, it also can be used in other areas of engineering, such as water delivery, aeration, and oxygenation. The simulations show that using a variable air injection rate can lift more nitrogen nutrients of 28.2 mol than using a fixed air injection rate of 26.6 mol, mostly with the same energy cost. Using this control algorithm, the changed temperature and dissolved oxygen profiles prove the effective upwelling in the experiments and the average weights of kelp are 33.1 g in the experimental group and 10.1 g in the control group. The ecological engineering was successfully increasing crop yield for carbon sequestration in coastal mariculture environments.

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

Cited by 22 publications

References 21 publications

A New Method of Selecting the Airlift Pump Optimum Efficiency at Low Submergence Ratios with the Use of Image Analysis

A New Method of Selecting the Airlift Pump Optimum Efficiency at Low Submergence Ratios with the Use of Image Analysis

Water Temperature Observation by Coastal Acoustic Tomography in Artificial Upwelling Area

Energy Management and Operational Planning of an Ecological Engineering for Carbon Sequestration in Coastal Mariculture Environments in China

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