Article
Materials Science, Multidisciplinary
A. D. Bazhina, A. S. Konstantinov, A. P. Chizhikov, V. V. Avdeeva, P. M. Bazhin
Summary: Materials based on MAX phases with Ti2AlC and Ti3AlC2 stoichiometry were successfully obtained using self propagating high-temperature synthesis and high-temperature shear deformation. By controlling the synthesis conditions and sample composition, materials with a desired stoichiometry and controlled size of MAX phase lamellar grains were achieved along with in situ hardening. The materials exhibit a cross section consisting of ceramic material, a transition region, and consolidated titanium. The obtained materials have a maximum microhardness on the surface, decreasing towards the titanium.
Article
Thermodynamics
Yali Shao, Xudong Wang, Baosheng Jin
Summary: A numerical model was developed to study the flow characteristics of a novel chemical looping combustion system. The study investigated the radial and axial distributions of gas-solid concentrations and velocities in the fuel reactor, as well as compared the performance of a tower-type reactor with a common cylindrical reactor in the air reactor. The findings provide fundamental guidance for the design, optimization, and scale-up of the system.
Article
Optics
Priyav Shah, Laurent M. Le Page, Benjamin A. O. Williams
Summary: Laser-induced grating spectroscopy (LIGS) is an optical diagnostic technique used for gas-phase thermometry in challenging environments. The Portable In-line LIGS for Optical Thermometry (PILOT) instrument is a compact and self-contained device capable of tracer-free LIGS measurements at a high frequency. It has various features such as adjustable path length matching and energy/power attenuation mechanism. The instrument has been characterized to produce accurate and precise temperature measurements and is ready for deployment in research facilities.
Article
Chemistry, Analytical
Ziying Lei, Jing Zhang, Emily A. Mueller, Yao Xiao, Katherine R. Kolozsvari, Anne J. McNeil, Mark M. Banaszak Holl, Andrew P. Ault
Summary: In this study, the Tg and composition of individual atmospheric particles were determined using NanoTA and AFM-PTIR techniques. The results showed intraparticle variation in chemical composition and Tg, which could potentially improve the modeling of aerosol impacts on clouds and climate.
ANALYTICAL CHEMISTRY
(2022)
Article
Environmental Sciences
Zhenzhong Yang Lv, Ying Yu, Meihui Ren, Tong Dang, Shunyang Wu, Hongquan Zhou, Lei Gao, Junchao Yue, Haijun Zhang, Chen Jiping
Summary: A field experiment was conducted in a modern municipal solid waste incineration power plant to explore the feasibility of using PAM to reduce the atmospheric emission of PCDD/Fs. The results showed that spraying PAM solution into the cooling tower significantly decreased the volume fraction of particles in BF fly ash and dust content in stack gas, leading to a higher removal efficiency of PCDD/Fs.
Review
Instruments & Instrumentation
Shan Gao, Xianqi Zhang, Liwei Chen, Ying Cui, Jing Jiang, Zezhan Zhang, Peifeng Yu, Chao Wang
Summary: This paper discusses the radiation temperature measurement methods of engine turbine blades and summarizes the influence of turbine blade radiation temperature and its elimination methods.
INFRARED PHYSICS & TECHNOLOGY
(2022)
Article
Environmental Sciences
Manabu Shiraiwa, Ulrich Poeschl
Summary: The study introduces an effective mass accommodation coefficient that considers the penetration depth into the particle phase, addressing key issues in the gas-particle partitioning of organic compounds in secondary organic aerosols (SOA).
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2021)
Article
Thermodynamics
Aravind Ravi, Philip de Goey, Jeroen van Oijen
Summary: Iron particles in air burn in a heterogeneous combustion mode and the flame speed is greatly affected by particle size. Previous studies on flame propagation in iron dust were based on average particle sizes, but in practical experiments, particle size distributions (PSD) are used, making comparisons challenging. This study aims to understand the effect of particle size distribution on flame propagation by investigating different PSDs and their impact on flame speed and structure. The results show that the width of the particle size distribution plays a crucial role, and experiments and simulations cannot be easily compared if different PSDs are used.
COMBUSTION AND FLAME
(2023)
Article
Thermodynamics
Yanwu Ji, Yunlan Sun, Baozhong Zhu, Jianzhong Liu, Yuxin Wu
Summary: The addition of calcium fluoride to micron-sized aluminum powder can improve its combustion performance, reducing the ignition delay time and increasing the self-sustaining combustion time.
Article
Materials Science, Multidisciplinary
Meng Liu, Jin Zhang, Ya-Ru Kong, Hong-Bin Luo, Yangyang Liu, Xiao-Ming Ren
Summary: Formic acid is a corrosive and pungent volatile organic acid widely used in various fields, and detecting it effectively is important for industrial and environmental air quality monitoring. This study introduces metal-organic frameworks (MOFs) thin films as sensing materials for formic acid detection at room temperature, with MOF-802 showing high chemical resistance and uniformity, leading to high selectivity and stability in detecting formic acid.
ACS MATERIALS LETTERS
(2021)
Article
Thermodynamics
Jiajia Song, Jun Deng, Jingyu Zhao, Yanni Zhang, Caiping Wang, Chi-Min Shu
Summary: The study investigated the effects of particle size on gases emitted from weathered coal under high-temperature oxygen deficiency, revealing that the concentration of indicator gas did not monotonically increase or decrease with the change in particle size. A particle size of 3 mm was determined to be the critical size during high-temperature oxidation of weathered coal. The results provided a pivotal theoretical basis for the early prediction and scientific prevention of the spontaneous combustion of weathered coal.
Article
Engineering, Multidisciplinary
Yi Su, Bin Zhang, Yifeng Chen, Chunjie Sui, Wei Chen
Summary: The latest research focuses on the development of non-contact, multi-parameter measurement methods for qualitative analysis and multi-dimensional visualization of combustion flow field. The study reconstructs three-dimensional velocity and temperature fields using PIV and deflection tomography temperature measurement methods, and explores the characteristics of swirl combustion.
Article
Energy & Fuels
Yong Tang, Xiangrui Zou, Wei Dong, Baolu Shi, Ningfei Wang, Shuiqing Li
Summary: This work investigates the ignition and burning of micron-sized aluminum particles using nonintrusive temperature measurements and high-speed photography. Two methods were developed to deduce the particle temperature and specify the two-dimensional temperature profile, showing potential for characterizing combustion processes.
Article
Chemistry, Physical
Ying Zhao, Deng-Xue Ma, Feng-Qi Zhao, Si-Yu Xu, Xue-Hai Ju
Summary: This study investigated the reaction mechanism of molten Al nano-droplets (ANDP) and H2O vapor at high temperature using reactive molecular dynamics. The combustion behavior of ANDP was found to involve outward extending growth of the oxidized phase and micro-explosion. The uncovering of details in the reaction process can guide the application of Al/H2O fuel and Al/H2O hydrogen production technology.
APPLIED SURFACE SCIENCE
(2022)
Article
Engineering, Multidisciplinary
Bin Yang, Weihao Li, Jianwen Xie, Xingchen Zhu, Feng Wang, Yang Yang, Zhihua Li
Summary: Measurement of hydrogen sulfide (H2S) in gaseous product can provide direct reference for high-temperature corrosion of industrial combustion equipment. This study focuses on the interference effect of overlapping measurement of H2S and other combustion gas components in UV absorption spectroscopy, and proposes an inversion algorithm to solve the problem of cross interference between H2S and SO2. Experimental results validate the effectiveness of the algorithm in detecting H2S and SO2 in combustion gas. A measurement system for H2S concentration in boiler flue gas near the wall is developed and applied, providing important references for combustion adjustment and high-temperature corrosion prevention.