Article
Engineering, Chemical
Maria Mitu, Venera Giurcan, Codina Movileanu, Domnina Razus, Dumitru Oancea
Summary: The paper investigates the laminar combustion velocities of N-2-diluted CH4-N2O flames under different conditions to provide useful information for the design of safety devices and recommendations.
Article
Engineering, Environmental
Zhenmin Luo, Chengcai Wei, Tao Wang, Bin Su, Fangming Cheng, Changchun Liu, Yachao Wang
Summary: The study investigated the explosion of LPG-air mixtures under different dilution levels of N-2 and CO2, revealing a cubic function relationship among various parameters. The results showed that N-2 and CO2 effectively suppressed the LPG explosion, with N-2 having higher inerting efficiency at high LPG volume fractions and CO2 at low LPG volume fractions.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Engineering, Civil
Song Lin, Zhentang Liu, Jifa Qian, Hui Zhao, Muhammad Ali, Zhoujie Gu
Summary: The addition of Al(OH)(3) powder has a significant effect on the structure and propagation characteristics of a polyethylene dust explosion flame, by decreasing flame brightness and propagation velocity, and diminishing flame pulsation. Al(OH)(3) powder retards the acceleration of flame propagation and decreases the thermal weight loss of polyethylene, showing significance in the prevention and treatment of polyethylene dust explosion accidents.
FIRE SAFETY JOURNAL
(2021)
Article
Engineering, Chemical
Wenying Wu, Weixing Huang, Aizhu Wei, Martin Schmidt, Ulrich Krause, Dejian Wu
Summary: The minimum explosion concentration (MEC) of three agriculture dusts and two coal dusts was studied to investigate the role of gaseous inhibitors. Both active and passive methods were used, and the thermal analysis tests were conducted to study the pyrolysis and combustion characteristics. An alternative explosion criterion based on combustion duration time was used to determine MEC, and the results were compared with the standardized overpressure method.
Article
Engineering, Chemical
Hangwei Wan, Yuquan Wen, Sheng Niu, Yongsheng Jia, Qi Zhang
Summary: This study investigated the explosion characteristics and mechanism of Al/air, AlH3/air, and Al/AlH3/air systems through experiments and simulations. The results showed that the induction time of Al dust explosion was shorter than that of AlH3, but the explosion severity of Al dust was smaller than that of AlH3. The addition of AlH3 dust in the three-component system shortened the explosion induction time.
Review
Chemistry, Physical
Peng Chen, Ting 'ao Shen, Yongliang Xie, Xin Su
Summary: Hydrogen energy is considered a promising energy source for the future, but safety issues must be addressed. This study numerically investigated the initial flame propagation characteristics of hydrogen spherical premixed flame at various initial temperature and radius. The results showed that the initial flame temperature and radius significantly influenced the self-sustained flame characteristics.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Energy & Fuels
Xiaozhe Yu, Jianliang Yu, Chenyang Wang, Xianshu Lv, Yalei Wang, Yujie Hou, Xingqing Yan
Summary: The study found that hydrogen concentration has a significant impact on the maximum pressure rise and the maximum rate of pressure rise in hybrid explosions of hydrogen/aluminum dust, and the flame propagation velocity has different responses in three stages as the hydrogen concentration changes.
Article
Energy & Fuels
Haiyan Wang, Zuohui Xu, Simin Tang, Xiao Chen, Zhenqian Liu
Summary: The distribution of methane in underground coal mines is affected by various factors, and experimental results show that methane accumulation and concentration gradient can influence the propagation of methane-air explosions, with a certain relationship between flame propagation velocity and overpressure.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2021)
Article
Engineering, Chemical
Zhenmin Luo, Fan Nan, Fang-ming Cheng, Yang Xiao, Tao Wang, Jie Shao, Chenchen Wang
Summary: In this study, the inhibitory effects of trifluoroiodomethane (CF3I) and carbon dioxide (CO2) on the explosion pressure and flame propagation characteristics of 9.5% methane were explored using a spherical 20 L experimental explosion device. The results showed that with an increase in the volume fraction of the gas explosion suppressants, the maximum explosion pressure, maximum explosion pressure rise rate, and flame propagation speed of methane gradually decreased, and the time taken to reach these parameters was delayed. The addition of trifluoroiodomethane to carbon dioxide improved the explosion suppression efficiency of carbon dioxide.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2023)
Article
Engineering, Chemical
Yi-Ming Chang, Chi-Min Shu, Mei-Li You
Summary: In this study, the inerting effects of nitrogen, argon, and carbon dioxide on the explosion range of methane were investigated using the grey entropy model. The results showed that carbon dioxide had a stronger inerting capacity. The conclusions drawn from the grey entropy theoretical soft computing calculations can be useful for preventing fire and explosion hazards in relevant processes.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2021)
Article
Engineering, Chemical
Baiwei Lei, Jianjun Xiao, Mike Kuznetsov, Thomas Jordan
Summary: This study developed a model of methane one-step combustion mechanism and studied the influence of thermal radiation and convection heat transfer on methane explosion through numerical simulations. The results showed that thermal radiation and convection heat transfer significantly affected the methane explosion process.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2022)
Article
Engineering, Chemical
Adrian Toman, Wojciech Adamus
Summary: Combustible aerosols are important in industrial processes but also pose explosion hazards. To assess the explosion risk and meet the ATEX directive requirements, information on flammable and explosive properties of aerosols is essential. Unlike gases and dusts, there are no standard procedures for obtaining quantitative information. Factors such as concentration, droplet size, and temperature influence the explosion dynamics of aerosols, and their generation methods also play a role. A prototype apparatus was designed and used to determine the basic explosion parameters of liquid flammable aerosols, demonstrating the relationship between aerosol concentration and explosion parameters.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2023)
Article
Energy & Fuels
Shucheng Guo, Feng Wu, He Wang, Xuhai Pan, Xiaowei Zang, Min Hua, Juncheng Jiang
Summary: This study investigates the characteristics of ethyl ether spray explosion at different concentrations, material temperatures, and ambient temperatures using a spray explosion experiment system. The results show that ambient temperature has a greater impact on the explosion characteristics of ethyl ether spray, while material temperature has a certain inhibitory effect.
Article
Engineering, Environmental
Hong Ji, Renjie Lu, Ke Yang, Juncheng Jiang, Zhixiang Xing, Jie Guo
Summary: This paper studied the inhibitory effect of modified ABC powder driven by heptafluoropropane on methane explosion. The experimental results demonstrated that the modified ABC powder has a certain inhibitory effect on methane explosions, but the explosive suppression effect of the powder improves when heptafluoropropane is used as the driving gas.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Thermodynamics
Song Lin, Zhentang Liu, Zhirong Wang, Jifa Qian, Zhoujie Gu
Summary: Deposited coal dust exacerbates the severity of a mine explosion accident when involved in a methane explosion. Mastering the duration and intensity of the explosion flame is crucial in determining the amount and duration of inhibitor injection to inhibit explosion propagation.
COMBUSTION SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Chemical
Maria Mitu, Venera Giurcan, Codina Movileanu, Domnina Razus, Dumitru Oancea
Summary: The paper investigates the laminar combustion velocities of N-2-diluted CH4-N2O flames under different conditions to provide useful information for the design of safety devices and recommendations.
Article
Energy & Fuels
Maria Mitu, Codina Movileanu, Venera Giurcan
Summary: Experimental measurements were conducted in a spherical combustion bomb to investigate flame propagation in N-2-diluted CH4-N2O mixtures with stoichiometric equivalence ratio. The study focused on the cubic law of pressure rise during the incipient stage of flame propagation and calculated burnt mass fractions and flame radii at various moments. The results also included cubic law coefficients and laminar burning velocities at considered time intervals.
Article
Materials Science, Multidisciplinary
Maria Mitu, Sabine Zakel, Elisabeth Brandes, Werner Hirsch
Summary: While ignition temperatures of many flammable substances in air and pure oxygen are well known, there is a lack of data on ignition temperatures in nitrous oxide, despite its widespread use as an oxidizer. Recent experiments have shown that ignition temperatures in oxidizer mixtures containing nitrous oxide increase with higher nitrous oxide concentrations.
FIRE AND MATERIALS
(2022)
Article
Thermodynamics
V Giurcan, M. Mitu, C. Movileanu, D. Razus, D. Oancea
Summary: The laminar burning velocities of a stoichiometric CH4-N2O mixture diluted with N-2 at various initial pressures and temperatures were numerically modeled. The study investigated the influence of initial conditions on burning velocities and flame characteristics.
COMBUSTION EXPLOSION AND SHOCK WAVES
(2022)
Article
Engineering, Chemical
Domnina Razus, Venera Giurcan, Codina Movileanu, Maria Mitu
Summary: A computational study was conducted to investigate the effect of adding nitrogen to hydrogen-nitrous oxide flames at different initial pressures and temperatures. The results showed that increasing the initial pressure and temperature led to higher mass fractions of NO and flame temperature.
Article
Energy & Fuels
Maria Mitu, Codina Movileanu, Venera Giurcan
Summary: This study evaluates the performance of the constant-volume method through experiments conducted in three different closed vessels. Accurate laminar burning velocities obtained from these experiments can be used in the development of computational fluid dynamics models to improve the design and efficiency of internal combustion engines. The experimental results were compared with data from different chemical kinetic mechanisms and literature, showing good agreement. The obtained pressure coefficients and overall reaction orders fall within the reference range of methane-air mixtures at ambient initial temperature.
Review
Energy & Fuels
Maria Mitu, Codina Movileanu, Venera Giurcan
Summary: This study presents data on the characteristic parameters of explosion propagation in gaseous ethane-air mixtures and analyzes their relationships with initial pressure, initial temperature, equivalence ratio, and explosion vessel characteristics. Ethane is widely used in various industries and applications, making it important to understand its explosion characteristics for safety and performance prediction purposes.
Article
Engineering, Chemical
Venera Giurcan, Maria Mitu, Codina Movileanu, Domnina Razus
Summary: This study investigates the effects of initial pressure on laminar burning velocities of diluted methane-nitrous oxide mixtures through experiments and numerical simulations, and determines the corresponding parameters.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Engineering, Chemical
Venera Giurcan, Domnina Razus, Maria Mitu, Codina Movileanu
Summary: The study investigates the explosion parameters of ethylene-nitrous oxide mixtures under different initial pressures and compositions. It is found that ethylene-N2O-N-2 mixtures develop higher explosion pressures and rates of pressure rise compared to ethylene-air mixtures under the same C/O ratio.
Article
Energy & Fuels
Domnina Razus, Codina Movileanu, Maria Mitu, Venera Giurcan
Summary: The propagation speeds of premixed n-butane-air mixtures were investigated under various initial conditions. Experimental measurements and kinetic modeling were conducted to obtain the propagation speeds. The study analyzed the obtained speeds based on both experimental and computed velocities, and discussed the dependence of the propagation speed on the initial pressure and temperature.
Article
Engineering, Chemical
Maria Mitu, Thomas Stolz, Sabine Zakel
Summary: The Maximum Experimental Safe Gap (MESG) is a significant criterion for evaluating the spread of flames through small gaps. It is used to classify flammable gases and vapors in explosion groups, which is essential for explosion protection. This study investigates the impact of inert gas addition on MESG to assess the effectiveness of inertization in explosion protection.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2023)
Article
Engineering, Chemical
Maria Mitu, Domnina Razus, Dorin Boldor, Cosmin Marculescu
Summary: Willow wood is a promising biomass for pyrolysis due to its fast growth, renewability, and high energy density. The pyrolysis of willow wood produced a multi-fuel gaseous mixture with a specific composition. Numerical simulations were conducted to investigate the combustion characteristics of these multi-fuel mixtures with air, providing important parameters for further analysis. The determination of overall activation parameters of multifuel oxidation with air was achieved by correlating the obtained parameters with initial pressure and temperature.
Review
Energy & Fuels
Codina Movileanu, Maria Mitu, Venera Giurcan
Summary: This paper summarizes the recent research on laminar burning velocities of hydrogen-enriched n-butane-air mixtures. The findings suggest that hydrogen addition can increase the laminar burning velocity and flame temperature, and improve flame stability. These results are useful for the optimization of combustion processes, particularly in internal combustion engines and gas turbines.
Proceedings Paper
Green & Sustainable Science & Technology
Maria Prodan, Emilian Ghicioi, Irina Nalboc, Andrei Szollosi-Mota, Sonia Suvar
Summary: Black powder is a solid contaminant found in natural gas pipelines, which can disrupt gas distribution and transportation operations, as well as pose health hazards. It can be comprised of various substances, including drilling mud, dust, and iron oxide.
2020 8TH INTERNATIONAL CONFERENCE ON ENVIRONMENT POLLUTION AND PREVENTION (ICEPP 2020)
(2021)
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)
