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BASED ON NUMERICAL SIMULATION OF ORTHOGONAL EXPERIMENTAL DESIGN OF BLAST FURNACE'S COAL LANCE operation parameters

METALURGIA INTERNATIONAL 2012年第2期17卷 64-67页

作者： Zhang, ZongWang Guo, Kai Li, Jian Li, Yan Zhu, LongYuan Univ Sci & Technol Beijing Sch Met & Ecol Engn Beijing Peoples R China

A three-dimensional numerical simulation has been developed for researching the coal lance operation parameters, and evaluating each parameter 's influential weight on coal burnout, the width of pulverized coal flow, which is based on orthogonal experimental design. The simulation results show that operation parameters have little effect on the coal burnout, coal lance has significant effect on the width of pulverized coal flow and exists optimum value.

关键词： Pulverized coal injection operation parameters Orthogonal experimental design Numerical simulation

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Determination of operation parameters for magnesium-air fuel cell to recover nitrogen and phosphorus from wastewater

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JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024年 365卷 121344页

作者： Li, Xingze Wan, Sizhuo Dong, Tingting Zhao, Zhiguo Wang, Ru Xian Univ Architecture & Technol Sch Environm & Municipal Engn 13 Yanta Rd Xian 710055 Peoples R China Xian Univ Architecture & Technol Key Lab Northwest Water Resource Environm & Ecol MOE 13 Yanta Rd Xian 710055 Peoples R China China Natl Heavy Machinery Res Inst Co Ltd Xian 710014 Peoples R China

Recovering phosphorus (P) and nitrogen (N) from wastewater not only contributes to environmental protection but also aligns with sustainable development goals. This study employed a magnesium -air fuel cell (Mg-O 2 -FC) to extract P and N from wastewater in the form of struvite (MgNH 4 & sdot;6H 2 O), based on the removal efficiency of ammonia and phosphate, electricity generation capacity and struvite purity to determine the optimal operation parameters. These parameters included hydraulic retention time (HRT), service life of magnesium sheet, and precipitation discharge frequency. The results showed that the removal efficiency of ammonia from 0 to 4h was 55.99%, and that from 4 to 12h was only 15.74%. The phosphate removal efficiency in the initial cycle was 97.68% but decreased to 63.25% after 24h. The phosphate removal rate in 2 min increased by 145% when the precipitation discharge frequency increased from 4 h/time to 24 h/time. Consequently, the HRT, service life of the magnesium sheet, and precipitation discharge frequency were selected as 4 h, 24 h, and 24 h/time. These optimized conditions provide valuable insights for the practical implementation of Mg-O 2 -FC in recovering N and P from wastewater.

关键词： Phosphorus recovery Nitrogen recovery Magnesium-air fuel cell struvite operation parameters

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A lab-scale MED dealing with salinity wastewater: the study of optimal operation schemes and parameters

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DESALINATION AND WATER TREATMENT 2016年第25期57卷 11721-11728页

作者： Zhao, Dongfeng Liu, Tianzhu Xue, Jianliang Li, Shi Li, Chao Liu, Wei Zhang, Hua Wang, Yanqi China Univ Petr Coll Chem & Chem Engn Qingdao 266580 Shandong Peoples R China Shandong Univ Sci & Technol Coll Chem & Environm Engn Qingdao 266590 Shandong Peoples R China

Multi-effect distillation (MED) system with a top brine temperature lower than 70 degrees C, is one of the most successful desalination technologies. In this paper, a lab-scale vertical tube MED system was performed for salinity wastewater desalination of petrochemical enterprises, and five salinity wastewater treatment schemes including different combinations of evaporator types were investigated. As a result, the falling-falling-climbing (FFC) system was considered as the optimal scheme. Then, the operation parameters including the feedwater salinity, temperature, flow rate, and the fresh steam flow rate were further optimized. The results indicated that the CR and gained output ratio (GOR) would rise up by increasing effect numbers, fresh steam flow rate, and feedwater temperature. While CR and GOR would fall down with the increase of the feedwater salinity and flow rate. Therefore, the optimal operation parameters were experimentally determined as follows: the feedwater with salinity of 0.6%, flow rate of 75kg/h, and temperature of 45 degrees C, and fresh steam flow rate of 17m(3)/h. The maximum CR and GOR were up to 5.08 and 4.13, respectively.

关键词： Multi-effect distillation Petrochemical enterprises Salinity wastewater operation schemes operation parameters

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CO2-assisted pyrolysis of plastic wastes: A review

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SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS 2025年 75卷

作者： Zhang, Pan Chaerusani, Virdi Zahra, Aghietyas Choirun Az Anniwaer, Aisikaer Zhao, Kun Gu, Fang Feng, Zhongbao Liu, Zhao Abudula, Abuliti Guan, Guoqing North China Elect Power Univ Dept Environm Sci & Technol Baoding 071003 Hebei Peoples R China Hirosaki Univ Inst Reg Innovat IRI Energy Convers Engn Lab 3 Bunkyocho Hirosaki 0368561 Japan Hirosaki Univ Grad Sch Sci & Technol 1 Bunkyocho Hirosaki 0368560 Japan Sumitomo Heavy Ind Ltd 19 Natsushima Cho Yokosuka Kanagawa 2378555 Japan Hebei Univ Coll Chem & Mat Sci Baoding 071002 Hebei Peoples R China Northeastern Univ Key Lab Ecol Met Multimet Mineral Minist Educ Shenyang 110819 Peoples R China

CO2-assisted pyrolysis is an effective method widely used in the chemical conversion of different raw materials to value-added products. In particular, CO2-assisted plastic pyrolysis can not only produce various hydrocarbons but also reduce the environmental pollution of plastic wastes and effectively reduce the emission of greenhouse gases. This technology has great significance for the treatment of urban plastic wastes. Herein, the latest progress in the pyrolysis of plastic wastes in the presence of CO2 is reviewed. Compared with typical pyrolysis in an inert environment (such as N2 or Ar), it is found that CO2 can change the type and yield of gas products, effectively inhibit the generation of benzene derivatives and polycyclic aromatic hydrocarbons (PAHs), and greatly prevent the reduction of catalyst activity. The conditions and catalysts required for CO2-assisted pyrolysis of different plastic wastes should be selected according to the requirements of desired products. Combined with pyrolysis kinetics, the proposed mechanisms of CO2-assisted plastic pyrolysis are introduced. Finally, the main issues of the current researches and the future development trend on CO2-assisted catalytic pyrolysis are discussed.

关键词： CO 2 utilization Plastic wastes Pyrolysis Catalysts operation parameters Mechanism analysis

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Influencing parameters for the operation of an MBR with respect to the removal of persistent organic pollutants

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DESALINATION AND WATER TREATMENT 2009年第1-3期6卷 102-107页

作者： Lipp, P. Kreissel, K. Meuler, S. Bischof, F. Tiehm, A. Water Technol Ctr Dept Technol D-76139 Karlsruhe Germany Water Technol Ctr Dept Environm Biotechnol D-76139 Karlsruhe Germany Hans Huber AG D-92234 Berching Germany Univ Appl Sci Amberg Weiden D-92224 Amberg Germany

Membrane bioreactors (MBR) are increasingly considered for decentralized waste water treatment. In this study, the operation parameters on a pilot MBR were optimized, and the removal of organic pollutants such as pharmaceutical residues was studied. During the first phase of the research project, two membrane materials (polyethersulfone, polysulfonamide) were chosen for the manufacturing of plate modules and operation in a pilot plant, which was installed in a municipal wastewater treatment plant (20.000 p.e.). operation conditions were optimized with regard to flux, filtration time, aeration rate, sludge age, total suspended solids, etc. Both membranes were ultrafiltration membranes and therefore achieved a very good retention with regard to particles (microorganisms and turbidity). In comparison to the conventional wastewater treatment process the system performance with regard to COD removal was higher in the MBR. Analysis of samples taken from the MBR process tank and the filtrate of both membrane types showed an improved elimination of some specific organic pollutants. Due to the promising results, more process based MBR studies are encouraged.

关键词： Membrane bioreactor Persistent organic pollutants operation parameters

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Numerical Analysis of Bio-Emulated Flow Channel: Effect of Design and Operating parameters on PEM Fuel Cell Performance

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IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY-TRANSACTIONS OF MECHANICAL ENGINEERING 2025年第3期49卷 1231-1248页

作者： Bondada, Yeswanth Yadav Golagani, Naga Srinivasulu Natl Inst Technol Warangal Dept Mech Engn Warangal Telangana India

Hydrogen energy and proton exchange membrane fuel cells (PEMFCs) have become widely embraced technologies in response to global concerns about environmental issues and the pursuit of other forms of energy. This study investigates PEMFC performance by introducing a new bio-emulated flow channel (BEFC) design inspired by an external carotid artery with branches. It also describes how BEFC affects the cell performance, taking into account the design geometries such as the width and depth of the flow channel, along with cell operating parameters like temperature, relative humidity (RH), and pressure. Simulation results indicated that a BEFC design, which includes a central channel with branching structures similar to the carotid artery, improves reactant distribution and water management. The performance data reveal that PEMFC with a 1 mm flow channel width and 1 mm flow channel depth achieves a maximum power density of 0.5758 W/cm2. Furthermore, increasing the operating temperature of the cell from 40 to 70 degrees C enhances performance due to better reaction kinetics. However, temperatures above 70 degrees C result in decreased performance due to increased water evaporation. The study also reveals that increasing relative humidity (RH) to 100% and raising operating pressures from 1 to 4 bar significantly improves power output by lowering Ohmic losses and raising reactant partial pressures. Overall, this study shows that optimal channel design and fuel cell operating conditions can greatly enhance PEMFC performance.

关键词： Computational fluid dynamics (CFD) Proton exchange membrane (PEM) External carotid artery operation parameters Design parameters

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Seawater desalination using inclined stepped solar still with copper trays in a wet tropical climate

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DESALINATION 2017年 423卷 141-148页

作者： Abujazar, Mohammed Shadi S. Fatihah, S. Kabeel, A. E. Univ Kebangsaan Malaysia Dept Civil & Struct Engn Bangi 43600 Selangor Malaysia Univ Kebangsaan Malaysia Res Ctr Sustainable Technol CESPRO Bangi 43600 Selangor Malaysia Tanta Univ Fac Engn Mech Power Engn Dept Tanta Egypt

In this study, a copper inclined stepped solar still was designed and fabricated to study the seawater desalination productivity of copper inclined stepped solar stills. The experimental setup mainly consists of two parts: a seawater settling and feeding tank and an inclined stepped solar still. The inclined stepped solar still with internal dimensions of L 1.8 m, W 1.2 m, and H 0.20 m consisted of 28 trays, and the tray dimensions are 0.6 m in height and 1.2 m in length. Its performance was tested in Bangi City - Malaysia, under Malaysian environmental conditions in the period from September 2016 to December 2016. The inclined stepped solar still was sealed to reduce vapour leakage to the environment. The experiment studies the effect of different environmental parameters (solar intensity, ambient temperature, wind velocity, humidity and cloud coverage) and operational parameters on the system productivity (water production and glass out, inner, vapour, water and tray "basin" temperature). The result shows that the productivity of the solar still was highly affected by environmental parameters. For example, the increase in solar radiation and ambient temperature increases the still temperature, and the difference between the cover inner and outer temperatures enhances the condensing process and water productivity. However, the decrease in humidity increases the productivity, the wind velocity significantly reduces the (T-1 - T-0) difference temperature, which adversely affects the productivity of the system, and the cloud coverage affects the solar radiation intensity. The productivity was 4383 mL/m(2)d;the best hourly efficiency was approximately 58% at 17:00, which can be explained by the highest solar radiation and ambient temperature with respect to time lag for the system.

关键词： Desalination Solar still Inclined stepped solar still Climatic parameters Design parameters operation parameters Efficiency Still productivity Seawater

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Performance of a hybrid direct ethylene glycol fuel cell

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INTERNATIONAL JOURNAL OF ENERGY RESEARCH 2019年第7期43卷 2583-2591页

作者： Pan, Zhefei Huang, Bin An, Liang Hong Kong Polytech Univ Dept Mech Engn Hung Hom Kowloon Hong Kong Peoples R China

In this work, a hybrid fuel cell is developed and tested, which is composed of an alkaline anode, an acid cathode, and a cation exchange membrane. In this fuel cell, ethylene glycol and hydrogen peroxide serve as fuel and oxidant, respectively. Theoretically, this fuel cell exhibits a theoretical voltage reaching 2.47 V, whereas it is experimentally demonstrated that the hybrid fuel cell delivers an open-circuit voltage of 1.41 V at 60 degrees C. More impressively, this fuel cell yields a peak power density of 80.9 mW cm(-2) (115.3 mW cm(-2) at 80 degrees C). Comparing to an open-circuit voltage of 0.86 V and a peak power density of 67 mW cm(-2) previously achieved by a direct ethylene glycol fuel cell operating with oxygen, this hybrid direct ethylene glycol fuel cell boosts the open-circuit voltage by 62.1% and the peak power density by 20.8%. This significant improvement is mainly attributed not only to the high-voltage output of this hybrid system design but also to the faster kinetics rendered by the reduction reaction of hydrogen peroxide.

关键词： direct ethylene glycol fuel cell fuel cells hydrogen peroxide operation parameters power density

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Evaluation of supercritical fluid extraction for isotope dilution gas chromatography-mass spectrometric quantification of polychlorinated biphenyls in sediment

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ANALYTICAL SCIENCES 2006年第11期22卷 1449-1454页

作者： Yarita, Takashi Aoyagi, Yoshie Numata, Masahiko Takatsu, Akiko Natl Inst Adv Ind Sci & Technol NMIJ Tsukuba Ibaraki 3058563 Japan

Supercritical fluid extraction (SFE),has been evaluated as an extraction technique for the isotope-dilution quantification of polychlorinated biphenyls (PCBs) in a sediment sample. A high-resolution mass-spectrometric system equipped with a gas chromatograph was employed for the determination of seven target PCB congeners. The effect of the operation parameters on the SFE efficiency was investigated, in which the analytical values of five target PCB congeners significantly increased with increases in the extraction temperature and pressure, and that of 4,4'-dichlorobiphenyl further increased by applying static extraction. The following conditions were found to be optimal: extraction temperature, 140 degrees C;pressure, 30 MPa;time and mode, static for 15 min then dynamic for 30 min. Under these conditions, the addition of modifiers influenced the extraction of polar compounds, but did not affect the analytical values of the PCB congeners: The optimized method was suitable for high-throughput analysis as well as for providing accurate analytical results, which were comparable to or better than the analytical results obtained by Soxhlet extraction.

关键词： .supercritical fluid PCBs extraction SFE Soxhlet Polychlorinated biphenyls operation parameters temperature pressure sediment sample extraction temperature National Metrology target PCB congeners analytical values following conditions time and mode

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Photoeletrocatalytic degradation of gaseous acetone using electrical glassfiber filter coated with nano-sized TiO₂ photoelectrocatalyst

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JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS 2017年 77卷 187-195页

作者： Li, Yuhua Li, Wan-Hua Yuan, Chung-Shin Hung, Chung-Hsuang Shen, Huazhen Hubei Univ Sch Resources & Environm Sci 368 Youyi Ave Wuhan Peoples R China Natl Sun Yat Sen Univ Inst Environm Engn 70 Lian Hai Rd Kaohsiung 804 Taiwan Natl Kaohsiung First Univ Sci & Technol Dept Safety Hlth & Environm Engn 2 Juoyue Rd Kaohsiung 811 Taiwan

Electrical glassfiber filters coated with nano-sized TiO2 (TiO2/EGF) were developed to degrade volatile organic compounds (VOCs) with photoelectrocatalytic (PEC) technique. Acetone was used as a target volatile organic compound for conducting the degradation experiments in a pan-type batch PEC reactor. The TiO2/EGF based PEC technique exhibited higher removal efficiency of acetone than that of traditional TiO2 photocatalytic (PC) technique. The degradation rate of acetone with PEC was about 2.79 times faster than that with PC. The degradation rate of acetone using PEC increased with electric field intensity from 0 to 6500 V. The correlation between the reaction rate and the initial concentration of acetone followed the first-order kinetics for acetone concentrations below 100 ppm, but followed the zero-order kinetics for acetone concentrations above 100 ppm. The reaction temperature in the range of 40-60 degrees C has a positive effect on the reaction rate of acetone. The reaction rate of acetone with PEC increased and then decreased with water vapor content. The Langmuir-Hinshelwood kinetic model can be successfully applied to simulate the PEC reaction of acetone degraded by the TiO2/EGF photoelectrocatalyst. The L-H kinetic model was further applied to explore the variation of reaction rate and equilibrium constants with operating parameters. (C) 2017 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.

关键词： Photoelectrocatalytic reaction TiO2/EGF Acetone degradation efficiency operation parameters Langmuir-Hinshelwood kinetic model

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