Dispersion characteristics of hydrogen leakage: Comparing the prediction model with the experiment

Shu, Zhiyong; Liang, Wenqing; Zheng, Xiaohong; Lei, Gang; Cao, Peng; Dai, Wenxiao; Qian, Hua

doi:10.1016/j.energy.2021.121420

Cited by 45 publications

(12 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[20][21][22] Based on the previous research, we used nitrogen (N 2 ) and helium (He) to replace the carbon monoxide (CO) and hydrogen (H 2 ) in experiments, respectively. 11,23 Because the molecular weight of N 2 and He was close to that of CO and H 2 . The influence of initial pressures (Nos.…”

Section: Experimental System and Schemementioning

confidence: 95%

See 1 more Smart Citation

Experimental and computational studies of concentration and flow field variation of syngas released

Li,

Wang,

Yin

et al. 2023

Env Prog and Sustain Energy

View full text Add to dashboard Cite

Syngas is an important chemical energy source with broad application prospects. The main problem with using syngas is its hazards, such as high storage pressure, high dispersion, low mass density, explosive, and toxic. The aim of this article is to find the key factors for the diffusion of syngas leakage and analyze the distribution of the dangerous concentration range from the diffusion behavior and hazard range characteristics of syngas leakage under complex working conditions. Therefore, a syngas leakage experimental bench is established, and a three‐dimensional simulation of syngas leakage was modeled. The results show that the initial pressure is the most critical factor, and the concentration distribution under different initial pressures is significantly different. The time required for carbon monoxide (CO) and hydrogen (H2) to reach their maximum concentration increased as the initial pressure or temperature decreased. The volume ratio had little effect on the time when CO and H2 reached the maximum concentration. In the horizontal direction, CO diffused further than H2 in the buoyant jet. The max volume fraction of H2 and CO did not exceed 1% and 2.5%, respectively. The research results are expected to give guidelines for the safety protection and standard improvement of syngas leakage.

show abstract

Section: Experimental System and Schemementioning

confidence: 95%

“…They found that air was more likely to entrain high concentration of hydrogen under subsonic condition. Shu et al 11 proposed a prediction model for predicting hydrogen diffusion and validated it through helium release experiments. Gong et al 12 studied the features of low‐temperature hydrogen horizontal jets.…”

Section: Introductionmentioning

confidence: 99%

Experimental and computational studies of concentration and flow field variation of syngas released

Li,

Wang,

Yin

et al. 2023

Env Prog and Sustain Energy

View full text Add to dashboard Cite

show abstract

“…As displayed in Figure 4, the airflow is the first case when N morton < 1 and the second case when N morton ≫1. 41 Shu et al 44 proposed a dimensionless representation that indicates that the distribution of hydrogen in a confined space depends on not only the volume but also the flow rate of the escaped gas.…”

Section: Leakage and Diffusion Characteristics Of Hphmentioning

confidence: 99%

Minireview on the Leakage Ignition and Flame Propagation Characteristics of Hydrogen: Advances and Perspectives

Wang

Zhao

et al. 2023

Energy Fuels

View full text Add to dashboard Cite

Hydrogen energy is a clean and efficient type of green energy whose use has been widely promoted. However, because of its physical and chemical characteristics, hydrogen tends to cause fires and explosions under certain conditions, which restricts its widespread application. After briefly describing the danger of high-pressure hydrogen (HPH), this paper summarizes the ignition and flame propagation characteristics of HPH leakage diffusion and describes the influences of various factors, such as leakage location, initial leakage velocity, initial pressure, presence of vents, ignition location, pipe size, and presence of obstacles, on these characteristics. HPH is likely to ignite spontaneously at the moment of leakage, and this ignition involves complex dynamics. Finally, the gap in the current research on HPH is described, and suggestions are provided for future research to promote the safe and efficient use of hydrogen energy.

show abstract

“…As an efficient, clean and renewable alternative fuel with high energy density, hydrogen energy has been widely used in various industries, such as rocket fuel, hydrogenpowered vehicles, and proton exchange membrane fuel cells. [1][2][3][4][5] However, there is a potential safety risk during the storage and transmission process due to its characteristics. Hydrogen has a low density (approximately 1/14 that of air at standard temperature and pressure), a wide flammability range (4%-75% vol), and extremely low minimum ignition energy (0.017 mJ).…”

Section: Introductionmentioning

confidence: 99%

“…As an efficient, clean and renewable alternative fuel with high energy density, hydrogen energy has been widely used in various industries, such as rocket fuel, hydrogen‐powered vehicles, and proton exchange membrane fuel cells 1–5 . However, there is a potential safety risk during the storage and transmission process due to its characteristics.…”

Section: Introductionmentioning

confidence: 99%

High‐pressure under‐expanded hydrogen leakage model considering gas‐wall friction loss

Xiang

et al. 2022

Energy Science & Engineering

View full text Add to dashboard Cite

The integral model is used to predict the concentration field, only suitable for low-pressure leakage, while the virtual nozzle model is widely used in highpressure leakage but ignores the friction between the hydrogen and the tube wall during the leakage. We modified the virtual nozzle model by adding the gas-wall friction loss term to the momentum conservation equation. A theoretical model of a high-pressure under-expanded jet is proposed by combining the integral model with the improved virtual nozzle model, which was validated by a series of helium (instead of hydrogen) dispersion in an unenclosed environment. And then the high-pressure hydrogen leakage system was set up to investigate hydrogen concentration along the centerline of the jet was measured under different pressures. Results show that the mole fractions along with the axial distance all comply with the hyperbolic decay law. Within the range of 40 cm < z < 100 cm, at other pressures of 1, 2, 4 MPa, the minimum deviations of high-pressure under-expanded hydrogen leakage prediction model and experiments are 1.67%, 1.37%, 1.33%, respectively. The study is adequately precise to predict high-pressure leakage concentration and also gives ideas about the installation position of the hydrogen sensor in engineering.

show abstract

Dispersion characteristics of hydrogen leakage: Comparing the prediction model with the experiment

Cited by 45 publications

References 28 publications

Experimental and computational studies of concentration and flow field variation of syngas released

Experimental and computational studies of concentration and flow field variation of syngas released

Minireview on the Leakage Ignition and Flame Propagation Characteristics of Hydrogen: Advances and Perspectives

High‐pressure under‐expanded hydrogen leakage model considering gas‐wall friction loss

Contact Info

Product

Resources

About