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17 results on '"Dai, Haoyuan"'

9. Performance evaluation of safety barriers based on multidimensional deconstruction.

Author

Kang, Jian, Wang, Lidan, Jin, Hao, Zhang, Jixin, and Dai, Haoyuan

Subjects
TRAFFIC safety, ACCIDENT prevention, FIRE prevention, DECONSTRUCTION, PETROLEUM chemicals industry
Abstract

Due to the technological development of the petrochemical industry, the number of risk factors is increasing. Therefore, the prevention of fire accidents in the petrochemical industry is crucial. Safety barriers are used in many working environments to protect workers and mitigate or prevent accidents and directly serve the safety function. This paper presents a semi‐quantitative evaluation model for safety barriers using multidimensional deconstruction. We use different methods to evaluate the characteristics of safety barriers for classification and determine the control level of each barrier. We normalize the performance evaluation results of the barriers to determine the level acceptable to experts. A gas station is selected as a case study for the safety barrier performance evaluation. The results validate the effectiveness of the proposed model and provide an analytical approach for other industries. [ABSTRACT FROM AUTHOR]

Published
2023
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12. Study on Friction Behavior of Ferroalloy and Wet Granulation Sulfur under Low Normal Load Conditions

Author

Jianchun Fan, Li Sun, Dai Haoyuan, Jiancun Gao, Zhibin Hu, and Yanqiu Yu

Subjects
Energy Dispersive Spectrometer, Diffraction, Materials science, Scanning electron microscope, Metals and Alloys, chemistry.chemical_element, Ferroalloy, 02 engineering and technology, 021001 nanoscience & nanotechnology, Sulfur, wet granulation sulfur, Granulation, 020303 mechanical engineering & transports, 0203 mechanical engineering, chemistry, Flash (manufacturing), low normal load, General Materials Science, ferroalloy, friction temperature, Composite material, mechanochemistry, 0210 nano-technology, Contact area
Abstract

To study the friction behavior of ferroalloy and wet granulation sulfur under low normal load conditions, a series of experiments were performed using a homemade rotating test apparatus. Scanning electron microscopy with an energy dispersive spectrometer (SEM-EDS) and X-ray diffraction (XRD) were utilized to examine the friction products. The experimentally monitored friction coefficient data were used to develop a finite element model to simulate the temperature field and a theoretical model to calculate the flash temperature of the contact area of the friction surface. The experimental, simulation, and theoretical results showed that the flash temperature of the friction surface is much higher than the average temperature of the friction surface and allows the reaction of iron and sulfur to form iron&ndash, sulfide compounds.

Published
2019
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15. Experimental study on ignition mechanisms of wet granulation sulfur caused by friction

Author

Dai Haoyuan, Jianchun Fan, Di Liu, Zhibin Hu, Shengnan Wu, and Yanqiu Yu

Subjects
musculoskeletal diseases, Environmental Engineering, Materials science, Health, Toxicology and Mutagenesis, Lab scale, chemistry.chemical_element, Iron sulfide, 02 engineering and technology, law.invention, Normal load, Granulation, chemistry.chemical_compound, 0203 mechanical engineering, law, Environmental Chemistry, Waste Management and Disposal, Spontaneous combustion, integumentary system, Metallurgy, musculoskeletal system, 021001 nanoscience & nanotechnology, Pollution, Sulfur, body regions, Ignition system, 020303 mechanical engineering & transports, chemistry, 0210 nano-technology, human activities
Abstract

It is common to see fire accidents caused by friction during the storage and transportation of wet granulation sulfur. To study the sulfur ignition mechanism under friction conditions, a new rotating test apparatus is developed to reproduce friction scenes at lab scale. A series of experiments are performed under different normal loads. The SEM-EDS and the XRD were utilized to examine the morphologies and compositions of the tested specimens and the friction products. Experimental results show that these two methods are mostly in agreement with each other. The iron-sulfide compounds are produced and the proportion of iron-sulfide compounds is reduced with normal loads increasing, compared to the total number of the friction products. The facts implied by the integration analysis of friction products with the temperature changes of the near friction surface unveil an underlying mechanism that may explain sulfur ignition by friction in real scenarios. The sulfur ignition may be mainly caused by the spontaneous combustion of iron sulfide compounds produced by friction under low normal load with 200 N. With the increase of normal loads, the resulting iron-sulfide compounds are decreasing and the high temperature from friction heat begins to play a major role in causing fire.

Published
2017

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