Article
Engineering, Chemical
Lifeng Li, Zichen Hu, Jiashun Liang, Shuaida Zhu, Yanbao Sun, Shiqi Zhang, Xiong Cao
Summary: This study investigates the impact of electrostatic ignition on the measurement of various dust explosion characteristics. The experiment was conducted using corn starch, aluminum powder, and hexogen (RDX) in a 5-L explosion vessel, with both electrostatic and pyrotechnical igniters. The schlieren technique was employed to examine the energy release characteristics of these two ignition methods. The results show that the explosion pressures of the dust clouds measured by both igniters were similar, but the rate of pressure rise differed depending on the type of dust and ignition method.
Article
Engineering, Chemical
Xiangfeng Chen, Jintao Xu, Haipeng Jiang, Wei Gao
Summary: The study investigated the effect of ignition location on the pressure characteristics of vented dust explosions in a 20 L chamber. Different ignition locations of the venting mixture coupled with the wall quenching effect dominated the internal pressure curves. The maximum pressure rise rate was controlled by the residual fuel and induced turbulence. The ignition location also influenced the delay time and number of pressure peaks in the external pressure.
Article
Energy & Fuels
Lu-Qing Wang, Hong-Hao Ma, Zhao-Wu Shen
Summary: The experimental investigation of the explosion characteristics of hydrogen-air mixtures in closed vessels with different equivalence ratios revealed that an increase in vessel height led to a corresponding increase in maximum explosion pressure and decrease in explosion time, while asymmetrical ignition resulted in decreased maximum explosion pressure and pressure rise rate, as well as increased explosion time and heat loss.
Article
Engineering, Environmental
Bisham McCarthy-Singh, Alberto Gambaruto
Summary: This study examines the design of electric valve actuators for explosion-proof hazardous environments and investigates the complex combustion effects caused by irregular geometries in the design process, leading to pressure piling. By developing a numerical method using OpenFOAM and conducting experiments to validate the results, this research aims to improve design techniques for controlling over-pressures generated by internal geometries.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Article
Energy & Fuels
Yanyu Qiu, Huadao Xing, Song Sun, Mingyang Wang, Bin Li, Lifeng Xie
Summary: The study found that ignition location affects the internal and external pressure characteristics during explosion venting tests. Different ignition points result in different pressure waveforms, with internal pressure having an inverse proportional relationship with distance and the maximum external pressure corresponding to flame development.
Article
Energy & Fuels
Yi Lu, Min Li, Deming Wang, Xingyu Shi, He Li, Yunfei Zhu, Qing Ye, Jiexin Lu
Summary: Electric effects are generated during the deformation and fracture of coal mine roof sandstones, which can potentially lead to gas explosions. The compressive strength of the rock plays a key role in the instantaneous discharge process.
Article
Engineering, Chemical
Wookyung Kim, Rinrin Saeki, Yasuko Ueno, Tomoyuki Johzaki, Takuma Endo, Kwangseok Choi
Summary: The effect of particle size on the minimum ignition energy (MIE) of aluminum dust clouds is explored using the MIKE 3 apparatus. The study reveals that smaller particle sizes result in lower MIE values. The relationship between d(p)(3) and MIE for micron-sized and larger aluminum particles aligns with theoretical predictions. However, for particle sizes approximately <10 μm, a relationship between d(p)(0.5) and MIE for 30 nm < d(p) < 10 μm is observed. This study confirms the dependence of MIE on particle size for aluminum dust clouds, with MIE similar to d(p)(3) in diffusion-controlled regimes and MIE similar to d(p)(0.5) in kinetic-controlled regimes.
Article
Energy & Fuels
Chunhua Wang, Jin Guo, Fuqiang Yang, Guoliang Zhang
Summary: This study experimentally investigated the effects of ignition position and ignition delay on the ignitability and flame behavior of stratified gasoline vapor. It was found that the closer the ignition source was to the oil surface, the earlier the local stratified gasoline vapor became ignitable and lost flammability. A two-zone flame structure was observed, including a blue premixed flame and a following yellow diffusion flame.
Article
Engineering, Environmental
Hongsheng Ma, Zhiyu Liu, Yang Li, Jiaqing Zhang, Yubiao Huang, Changjian Wang
Summary: The effects of ignition energy, oil volume, and ignition position on the overpressure buildup and fireball behavior caused by transformer oil explosions are investigated in this study. Experimental results show that the shape of the fireball is significantly affected by the ignition position and both the maximum fireball radius and area increase with the increase of oil volume. The study also observes a double-peak overpressure structure, with the first peak generated by the explosive explosion and the second peak induced by the coupling between initial fireball combustion waves and reflected shock waves.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Energy & Fuels
D. O. Glushkov, K. K. Paushkina, A. O. Pleshko, V. S. Vysokomorny
Summary: The characteristics of combustion processes of single gel fuel particles with a mass of 10 mg in a high-temperature motionless air medium were investigated using a hardware and software system. Different fuel compositions showed micro-explosive dispersion of particles under rapid heating conditions. Temperature variations in the air and gas-vapor mixture during combustion were determined using advanced pyrometry techniques.
Article
Engineering, Chemical
Hanwen Zhang, Jin Guo, Jingui Wang, Jiahan Wu, Haozhe Wang
Summary: This study investigates the effects of ignition position on the explosion of non-uniform methane-air mixtures. The results show that ignition position and ignition delay time are crucial factors influencing ignition success and flame propagation.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2023)
Article
Computer Science, Artificial Intelligence
Qiming Xu, Guohua Chen, Shen Su, Jinkun Men, Geliang Li
Summary: This paper presents a novel approach that integrates explosive theory and data science to predict explosion overpressure and guide engineering design. A dimensionless mathematical formula was constructed based on explosive theory and used in data sets to consider various parameters. The predictive accuracy of this method was proven and showed better results compared to other models.
EXPERT SYSTEMS WITH APPLICATIONS
(2023)
Article
Energy & Fuels
Xufeng Yang, Minggao Yu, Shixin Han, Beibei Qi
Summary: The experimental results reveal that the flame oscillates more violently when the ignition location is close to the open end, and pressure waves play an important role in flame propagation. The equivalence ratio and ignition location are coupled to affect the premixed syngas-air explosion.
Article
Energy & Fuels
Min Li, Yi Lu, Shiliang Shi, He Li, Zhaojun Tian, Qing Ye, Jiexin Lu
Summary: Understanding the spatial characteristics of goaf can help prevent gas explosions, with the piezoelectric effect of coal seam roofs potentially igniting goaf gas disasters. The high quartz content and compressive strength of the roof rock play a crucial role in generating electric sparks that lead to gas explosions. This research sheds light on the mechanism behind gas explosion accidents in coal mines.
Article
Engineering, Environmental
Zhenhai Hou, Deming Wang, Wei Zhang, Shengyun Luo, Yansen Lu, Siyu Tian, Qiu Zhong, Zuoming Xu
Summary: This paper studies the effect of ignition positions on the explosion characteristics of methane-air mixture, and the results show that regardless of ignition position, the overpressure curve at each measuring point follows a process of rising-falling to negative-rising-stabilizing. As the ignition position moves farther away from the closed end, the overpressure at the closed end and the average flame speed on the right side of the ignition source gradually increase, while the average flame speed on the left side decreases.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Engineering, Environmental
Xingxing Hu, Lingjie Liu, Yanmeng Bi, Lu Li, Chunsheng Qiu, Jingjie Yu, Shaopo Wang
Summary: In this study, the impact of exogenous folate on the start-up process of single-stage partial nitritation-anammox (SPNA) was evaluated using two lab-scale reactors. The results showed that folate addition can enhance nitrogen removal rate, extracellular polymeric substances production, hydrazine oxidase and dehydrogenase activity, as well as the relative abundance of Candidatus Brocadia.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Shaocang He, Tingting Shen, Jing Sun, Haoqi Pan, Chenxu Sun, Tianpeng Li, Runyao Li, Enshan Zhang
Summary: A novel process of acid leaching neutralization was developed for the preparation of inorganic polymeric composite ferric aluminum silicate coagulant (CFAS) using solid waste coal gasification coarse slag (CGCS). The optimized preparation process was determined through single-factor experiment and the performance of CFAS was evaluated for domestic sewage treatment. The results showed that CFAS exhibited excellent coagulation ability and achieved significant removal efficiency for turbidity, ammonia nitrogen, and chemical oxygen demand.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Kinga Szatmari, Sandor Nemeth, Alex Kummer
Summary: In this article, a resilience-based reinforcement learning approach is proposed to address the potential thermal runaway issue in batch reactors. By calculating the resilience metric for reactors and utilizing Deep Q-learning to decide when to intervene in the system, resilient-based mitigation systems can be effectively developed.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Bingyou Jiang, Qi Yao, Mingqing Su, Jingjing Li, Kunlun Lu, Dawei Ding, Han Hong
Summary: This study investigates the inhibitory characteristics and mechanisms of ABC powder on coal powder explosion. The addition of ABC powder significantly decreases the maximum explosion pressure and can completely suppress coal dust explosions. The study also reveals the thermal decomposition characteristics and reaction kinetics of the mixed system.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Kubilay Bayramoglu, Mustafa Nuran
Summary: This study examines the feasibility of using pyrolytic oil from waste tires as fuel in diesel engines, and evaluates its energy, exergy, and sustainability. The results indicate that pyrolytic oil has potential as a renewable fuel source with relatively high thermal efficiency.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Xinru Duan, Yejia Lv, Jiaxing Hong, Jianzhong Wu, Jia Zhang, Yang Yue, Guangren Qian
Summary: This study successfully prepared a tube reactor with optimized catalyst formula, which showed good performance in removing dioxins and other pollutants in the experiments.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Jiaoyang Du, Xueming Dang, Xiaorong Gan, Xin Cui, Huimin Zhao
Summary: In this study, a photocatalyst-enzyme hybrid system was constructed, which solved the issue of enzyme inactivation caused by high concentration of H2O2 through photocatalytic in-situ H2O2 production, and improved the stability and catalytic efficiency of the enzyme. The effectiveness of the system in treating phenolic EDCs was confirmed through experiments.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Fu-Rong Xiu, Longsheng Zhan, Yingying Qi, Xinyue Lei, Jiali Wang, Haipeng Zhou, Wenting Shao
Summary: This study developed a synergetic and high-efficiency treatment of waste tantalum capacitors (WTCs) and polyvinyl chloride (PVC) using subcritical water process. The treatment significantly reduced the temperature and reaction time for metal tantalum recovery from WTCs, and improved the dechlorination efficiency of PVC. The optimized conditions resulted in 100% resin conversion efficiency of WTCs and 97.39% dechlorination efficiency of PVC. The interaction between decomposition products of WTCs and PVC produced a high level of benzoic acid.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Bingda Li, Jiaming Song, Yuting Li, Chaoying Meng, Shuxian Wang, Linghao Zong, Honggang Ye, Yishuai Jing, Feng Teng, Peng Hu, Haibo Fan, Guangde Chen, Xin Zhao
Summary: CdPS3 nanosheets, especially those exfoliated by sodium cholate, have shown highly efficient photocatalytic degradation performance. The strong dark adsorption and dye-sensitized photocatalytic properties of CdPS3 nanosheets contribute to high degradation efficiencies of various pollutants.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Dongxu Ouyang, Yimei Pang, Bo Liu, Zhirong Wang
Summary: This study investigates the thermal runaway features of lithium-ion cells under tunnel conditions, considering different states of charge and tunnel ceilings. The results show that the tunnel visibility is affected by the smoke generated during thermal runaway, and the shape of the tunnel ceiling influences the temperature rise differently.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)