A new cavity profile for a diaphragm compressor used in hydrogen fueling stations

Hu, Yuanlin; Xu, X.Z. Shawn; Wang, Wen

doi:10.1016/j.ijhydene.2017.08.058

Cited by 24 publications

(6 citation statements)

References 30 publications

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“…It is directly related to the transport of momentum, heat, and water through the boundary layer. Equation (7)(8) shows that TKE is related to fluid velocity and turbulent intensity, and that the larger the TKE, the greater the rate of dissipation. However, excessive energy consumption is not conducive to the long-term operation of a diaphragm compressor.…”

Section: Resultsmentioning

confidence: 99%

“…Jia et al [6] pointed out that the reason for the failure of the diaphragm in the contact area with the oil distribution plate is radial stress and local additional stress, and proposed a theoretical calculation method combining thin plate large deflection theory and thin plate small deflection theory to analyze these two stresses. Hu et al [7] optimized the design of a new diaphragm compressor chamber curve with the goal of reducing the maximum radial stress of the diaphragm on the oil side and the gas side. Through experiments and numerical simulations, it was found that the stress on the diaphragm was smaller in the new curve than in the traditional one.…”

Section: Introductionmentioning

confidence: 99%

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Fluid characteristics analysis and structure optimization in diaphragm compressor

Liu

Tian

Chen³

et al. 2023

Third International Conference on Mechanical Design and Simulation (MDS 2023)

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To study the gas and liquid flow characteristics inside the diaphragm compressor and optimize the structure of the gas and oil chambers to improve the overall reliability of the machine, the CFD method was used to establish fluid models for the gas and oil chambers separately. The velocity and turbulence energy distribution of the gas chamber, as well as the pressure and flow velocity distribution of the oil chamber, were obtained. Various layout schemes for the gas and oil holes were optimized and compared. The results showed that the maximum flow velocity and turbulence energy of the gas chamber for scheme 1 were greater than those of the original design, but both decreased gradually for schemes 1-4. The centering of the distribution hole in the oil chamber had a significant effect on fluid characteristics, and the results from schemes 1-4 indicated that as the hole diameter increased, the maximum flow velocity and pressure gradually decreased. Additionally, under the condition of ensuring that local stresses were not too high, the fourth scheme was the optimal solution for both the gas and oil chambers. The maximum turbulence energy of the gas chamber decreased by 29.1% compared to the initial structure, and the maximum pressure and velocity of the oil chamber decreased by 35.5% and 71.5%, respectively.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fluid characteristics analysis and structure optimization in diaphragm compressor

Liu

Tian

Chen³

et al. 2023

Third International Conference on Mechanical Design and Simulation (MDS 2023)

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show abstract

“…One of the most common deactivation mechanism is the catalyst sintering, since high temperature could cause the catalytic particle agglomeration, resulting in a reduced catalytic activity [91]. Finally, catalytic poisoning due to impurities in the water or metallic dissolution in bipolar plates are responsible for a (more or less) transitory catalytic deactivation, since impurities occupy active sites [92]. Diverse diagnostic approaches are deployed, with the most cutting-edge methodologies involving statistical techniques grounded in neural networks.…”

Section: Research Highlightsmentioning

confidence: 99%

A Survey on Anomalies and Faults that may Impact the Reliability of Renewable-based Power Systems

Mariani,

Adinolfi,

Buonanno

et al. 2024

Preprint

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The decarbonization of the electricity grid as one among the actions to reduce fossil fuel emissions, and thus their impact on global warming in the future, will be achieved mainly via the integration and widespread diffusion of renewable power sources. This is going to be supported also by the shift from the paradigm production-transmission-distribution, where electricity production oversees large-size power plants, to renewable-based distributed/diffused production, where electricity is generated very close or even by the same (group of) user(s) (or prosumers in the latter case). The number of mid-/small-size installations based on renewable energy technologies will therefore increase substantially, and the related renewable generation will be dominant against that from large-size power plants. Unfortunately, this will reduce the reliability of the grid very likely, unless appropriate countermeasures are taken/implemented, hopefully at the same time the paradigm shift is being achieved. To this aim, it is important to identify the anomalies and main fault causes that might determine in renewable-based power systems. This paper surveys the current state-of-the-art on anomalies and faults affecting wind-PV-storage hybrid power systems, i.e., the main renewable technology ensemble that will establish the future grid, and highlights possible research directions that may help to fill the literature gaps.

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“…Jia et al [26] proposed an analysis method of diaphragm stress which is combined with the small deflection and thinplate large deflection theories and investigated some influence factors of the diaphragm fracture. Hu et al [27] proposed a new generatrix for cavity profile, which can eliminate the dead volume in the cavity and reduce the maximal and the centric redial stress of the diaphragm by 8.2% and 13.9%, respectively. Li et al [28] studied the characteristics of diaphragm stress distribution during the working process of diaphragm compressors.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Heat Transfer of the Gas Head Cover of Diaphragm Compressors for Hydrogen Refueling Stations

et al. 2023

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The inadequate ability to dissipate heat of the gas head cover of the diaphragm compressor will result in its excessive temperature, which will put the operation of the hydrogen filling station at risk for safety issues and raise operating costs. This paper analyzed the structure and the heat transfer characteristics of the gas head cover, along with the relevant heat transfer boundaries, based on which a finite element simulation model of the temperature distribution was established. A test rig for the temperature test of a 22 MPa diaphragm compressor was built to validate this simulation model. The results indicated that the simulated temperatures agree well with the measured values, and the deviation is within 9.1%. Further, this paper proposed two head cover structures for enhancing the heat transfer according to the temperature field distribution characteristics, and the simulation and experimental verification were carried out, respectively. The findings demonstrate that the method of enhancing heat transfer around the centre area is more effective, reducing the highest temperature by 14.1 °C, because it greatly lowers thermal conduction resistance, which is the principal impediment to the heat dissipation of the gas head cover.

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A new cavity profile for a diaphragm compressor used in hydrogen fueling stations

Cited by 24 publications

References 30 publications

Fluid characteristics analysis and structure optimization in diaphragm compressor

Fluid characteristics analysis and structure optimization in diaphragm compressor

A Survey on Anomalies and Faults that may Impact the Reliability of Renewable-based Power Systems

Analysis of Heat Transfer of the Gas Head Cover of Diaphragm Compressors for Hydrogen Refueling Stations

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