Numerical Study on Heterogeneous Reaction Characteristics of a Single Coal Char Particle Under Air- and Oxy-Fuel Combustion: Effects of Particle Motion

2021 ◽  
Author(s):  
Zewu Zhang ◽  
Yi Zhong ◽  
Zhenghong Zhao ◽  
Liqi Zhang ◽  
Xiaojian Zha ◽  
...  
Keyword(s):  
Particle Motion ◽  
Numerical Study ◽  
Heterogeneous Reaction ◽  
Fuel Combustion ◽  
Coal Char ◽  
Reaction Characteristics ◽  
Char Particle

Oxy-fuel combustion of millimeter-sized coal char: Particle temperatures and NO formation

Fuel ◽  
2013 ◽  
Vol 106 ◽  
pp. 72-78 ◽  
Author(s):  
Jacob Brix ◽  
Leyre Gómez Navascués ◽  
Joachim Bachmann Nielsen ◽  
Peter Løvengreen Bonnek ◽  
Henning Engelbrecht Larsen ◽  
...  
Keyword(s):  
Fuel Combustion ◽  
Coal Char ◽  
No Formation ◽  
Char Particle

Reaction behaviors of a single coal char particle affected by oxygen and steam under oxy-fuel combustion

Fuel ◽  
2021 ◽  
Vol 291 ◽  
pp. 120229
Author(s):  
Zewu Zhang ◽  
Zhenghong Zhao ◽  
Fan Wu ◽  
Cong Luo ◽  
Xiaoshan Li ◽  
...  
Keyword(s):  
Fuel Combustion ◽  
Coal Char ◽  
Char Particle

Numerical study of a reacting single coal char particle with different pore structures moving in a hot O2/CO2 atmosphere

Fuel ◽  
2017 ◽  
Vol 206 ◽  
pp. 381-389 ◽  
Author(s):  
Zhicun Xue ◽  
Qinghua Guo ◽  
Yan Gong ◽  
Jianliang Xu ◽  
Guangsuo Yu
Keyword(s):  
Numerical Study ◽  
Coal Char ◽  
Pore Structures ◽  
Char Particle ◽  
Co2 Atmosphere

The effect of H2O on the oxy-fuel combustion of a bituminous coal char particle in a fluidized bed: Experiment and modeling

2020 ◽  
Vol 218 ◽  
pp. 42-56 ◽  
Author(s):  
Changsheng Bu ◽  
Alberto Gómez-Barea ◽  
Bo Leckner ◽  
Xinye Wang ◽  
Jubing Zhang ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Bituminous Coal ◽  
Fuel Combustion ◽  
Coal Char ◽  
Char Particle

scholarly journals Numerical study on the effects of intake charge on oxy-fuel combustion in a dual-injection spark ignition engine at economical oxygen-fuel ratios

2021 ◽  
pp. 146808742110222
Author(s):  
Xiang Li ◽  
Yiqiang Pei ◽  
Zhijun Peng ◽  
Tahmina Ajmal ◽  
Khaqan-Jim Rana ◽  
...  
Keyword(s):  
Combustion Engine ◽  
Numerical Study ◽  
Carbon Capture And Storage ◽  
Spark Ignition ◽  
Fuel Combustion ◽  
Spark Ignition Engine ◽  
Gasoline Direct Injection ◽  
Brake Mean Effective Pressure ◽  
Dual Injection ◽  
Injection Strategies

In order to decrease Carbon Dioxide (CO2) emissions, Oxy-Fuel Combustion (OFC) technology with Carbon Capture and Storage (CCS) is being developed in Internal Combustion Engine (ICE). In this article, a numerical study about the effects of intake charge on OFC was conducted in a dual-injection. Spark Ignition (SI) engine, with Gasoline Direct Injection (GDI), Port Fuel Injection (PFI) and P-G (50% PFI and 50% GDI) three injection strategies. The results show that under OFC with fixed Oxygen Mass Fraction (OMF) and intake temperature, the maximum Brake Mean Effective Pressure (BMEP) is each 5.671, 5.649 and 5.646 bar for GDI, P-G and PFI strategy, which leads to a considerable decrease compared to Conventional Air Combustion (CAC). [Formula: see text], [Formula: see text] and [Formula: see text] of PFI are the lowest among three injection strategies. With intake temperature increases from 298 to 378 K, the reduction of BMEP can be up to 12.68%, 12.92% and 12.75% for GDI, P-G and PFI, respectively. Meantime, there is an increase of about 3% in Brake Specific Fuel Consumption (BSFC) and Brake Specific Oxygen Consumption (BSOC). Increasing OMF can improve the performance of BMEP and BSFC, and the trend is more apparent under GDI strategy. Besides, an increasing tendency can be observed for cylinder pressure and in-cylinder temperature under all injection strategies with the increase of OMF.

Coal Char Thermal Deactivation under Pulverized Fuel Combustion Conditions

2000 ◽  
Vol 14 (4) ◽  
pp. 883-888 ◽  
Author(s):  
N. V. Russell ◽  
J. R. Gibbins ◽  
C. K. Man ◽  
J. Williamson
Keyword(s):  
Fuel Combustion ◽  
Coal Char ◽  
Thermal Deactivation ◽  
Pulverized Fuel

scholarly journals Numerical Analysis of Single-Particle Motion Using CFD-DEM in Varying-Curvature Elbows

2022 ◽  
Vol 10 (1) ◽  
pp. 62
Author(s):  
Chao Ning ◽  
Yalin Li ◽  
Ping Huang ◽  
Hongbo Shi ◽  
Haichao Sun
Keyword(s):  
Single Particle ◽  
Particle Motion ◽  
Numerical Study ◽  
Area Ratio ◽  
Centrifugal Pumps ◽  
Distribution Law ◽  
Two Phase ◽  
Curvature Ratio ◽  
Critical Components ◽  
Solid Liquid

Centrifugal pumps are the critical components in deep-sea mining. In order to investigate the particle motion in the curved channel of the impeller, three different types of curvature conform to blade profile to simplify the impeller design of pumps. A numerical study is conducted to investigate the flow field in a varying-curvature channel for solid-liquid two-phase flow. The flow of particles within the varying curvature channel is studied by combining the discrete element method (DEM) with computational fluid dynamics (CFD) and a comparison with Particle Image Velocimetry (PIV) test results. The results show that a polyhedral mesh with a small mesh number yields very accurate results, which makes it very suitable for CFD-DEM. Based on this method, the movement of a single particle is compared and analyzed, and the particle-motion law is obtained. The effects of the curvature ratio Cr and area ratio Ar on the motion law for a single particle are studied, and the simulation results are analyzed statistically. The results show that the effect of Cr on both the particle slip velocity and the turbulent kinetic energy only changes its strength, while the distribution law does not change significantly. Compared with the curvature ratio Cr, the area ratio Ar has a greater impact on the particles, and its distribution law becomes clearly different. As the area ratio Ar increases, the arc radius and length of the corresponding particle trajectory decrease.

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