Micron-sized water spray-cooled quasi-isothermal compression for compressed air energy storage

Jia, Guanwei; Xu, Weiqing; Cai, Maolin; Shi, Yan

doi:10.1016/j.expthermflusci.2018.03.032

Cited by 48 publications

(14 citation statements)

References 14 publications

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“…With a similar configuration, Zhang et al [67] only obtained a 10% gas temperature abatement compared to the adiabatic case, mainly due to a small L/D ∼ 1. Guanwei et al [68] has built an experimental setup to test the spray heat transfer rate and thus on the η c . The best η c (92,8%) has been achieved with CR=2 and D = 0.3 mm nozzle diameter.…”

Section: Spray Injectionmentioning

confidence: 99%

Review on Liquid Piston technology for compressed air energy storage

Gouda

Fan

Benaouicha³

et al. 2021

Journal of Energy Storage

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Compressed air energy storage systems (CAES) have demonstrated the potential for the energy storage of power plants. One of the key factors to improve the efficiency of CAES is the efficient thermal management to achieve near isothermal air compression/expansion processes. This paper presents a review on the Liquid Piston (LP) technology for CAES as a timely documentary on this topic with rapidly growing interests. Various aspects are discussed including the state-of-the-art on LP projects all over the world and the trend of development, the coupled fluid flow and heat transfer during the compression/expansion operations, and different actions proposed and implemented to enhance the heat transfer inside the piston column.It has been found that LP is a promising concept for isothermal CAES. However, the complex and transient fluid flow and heat transfer behaviors inside the LP are difficult to characterize and master. To enhance the heat transfer and increase the efficiency of the compression/expansion processes many approaches have been tested including liquid spray, wire mesh, porous media, optimal trajectory, hollow spheres and optimal geometry of the piston column. Numerous Nusselt number's empirical correlations have also been proposed to estimate the

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Section: Spray Injectionmentioning

confidence: 99%

Review on Liquid Piston technology for compressed air energy storage

Gouda

Fan

Benaouicha³

et al. 2021

Journal of Energy Storage

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“…However, additional energy consumption is required to generate higher pressure (3~5 MPa) for micro droplets. Energy consumption of the micro spray droplets is equal to the work conservation when the water spray mass reaches 1.5 g/cycle (nozzle in diameter of 0.3 mm) [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

A Novel Isothermal Compression Method for Energy Conservation in Fluid Power Systems

Ren

Jia

et al. 2020

Entropy

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Reducing carbon emissions is an urgent problem around the world while facing the energy and environmental crises. Whatever progress has been made in renewable energy research, efforts made to energy-saving technology is always necessary. The energy consumption from fluid power systems of industrial processes is considerable, especially for pneumatic systems. A novel isothermal compression method was proposed to lower the energy consumption of compressors. A porous medium was introduced to compose an isothermal piston. The porous medium was located beneath a conventional piston, and gradually immerged into the liquid during compression. The compression heat was absorbed by the porous medium, and finally conducted with the liquid at the chamber bottom. The heat transfer can be significantly enhanced due to the large surface area of the porous medium. As the liquid has a large heat capacity, the liquid temperature can maintain constant through circulation outside. This create near-isothermal compression, which minimizes energy loss in the form of heat, which cannot be recovered. There will be mass loss of the air due to dissolution and leakage. Therefore, the dissolution and leakage amount of gas are compensated for in this method. Gas is dissolved into liquid with the pressure increasing, which leads to mass loss of the gas. With a pressure ratio of 4:1 and a rotational speed of 100 rpm, the isothermal piston decreased the energy consumption by 45% over the conventional reciprocation piston. This gain was accomplished by increasing the heat transfer during the gas compression by increasing the surface area to volume ratio in the compression chamber. Frictional forces between the porous medium and liquid was presented. Work to overcome the frictional forces is negligible (0.21% of the total compression work) under the current operating condition.

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“…However, wet compression has not been industrially applied in CAES, and just only few studies on isothermal CAES systems have been conducted. 14–18 Qin and Loth found that the efficiency of a liquid piston compression process increases by 27% with a water injection ratio of 5%. 14,15 Chen et al.…”

Section: Introductionmentioning

confidence: 99%

“…founded that wet compression can improve the compression efficiency by 5.7% with water injection 0.416 g/cycle for CAES system. 17 Srivatsa et al. showed that injection of droplets in a liquid piston/expander system can significantly increase the efficiency-power trade-off at high flow rates for low efficiency cases.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on wet compression in a supercritical air centrifugal compressor

Sun

Hou

Zuo

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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Wet compression is widely used to reduce compression work and improve efficiency in gas turbines. However, wet compression has not been industrially applied in the compressed air energy storage system (only few studies on isothermal compressed air energy storage system exist), which has an urgent demand to reduce the compression work. The high-pressure section of the compressed air energy storage system usually contains supercritical air, and the influence of supercritical wet compression is not yet clear. Thus, in this study, supercritical wet compression was numerically investigated in a centrifugal compressor used for the compressed air energy storage system, and its effects on performance and internal flow were also studied. The results show that the ideal maximum evaporation of water droplets in supercritical air is very low, which limits the maximum available water injection ratio; however, wet compression still has some benefits, such as increasing the total pressure ratio and isentropic efficiency and reducing the compression specific work. Moreover, wet compression reduces the diffuser loss but raises the wake loss in the impeller at the near-stall point. For this compressor, the optimum water injection ratio is 0.3%, which reduces the specific work by 0.65% at the designed pressure ratio.

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Micron-sized water spray-cooled quasi-isothermal compression for compressed air energy storage

Cited by 48 publications

References 14 publications

Review on Liquid Piston technology for compressed air energy storage

Review on Liquid Piston technology for compressed air energy storage

A Novel Isothermal Compression Method for Energy Conservation in Fluid Power Systems

Numerical study on wet compression in a supercritical air centrifugal compressor

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