Browsing NTNU Open by Author "Li, Tian"
Now showing items 1-20 of 24
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A fast-solving particle model for thermochemical conversion of biomass
Li, Tian; Thunman, Henrik; Ström, Henrik (Journal article; Peer reviewed, 2020)Computational fluid dynamics (CFD) simulations of large-scale furnaces or reactors for thermal conversion of solid fuels remains challenging partially due to the high computational cost related to the particle sub-models. ... -
An Alternative Approach for the Estimation of Biochar Yields
Weber, Kathrin; Heuer, Sebastian; Quicker, Peter; Li, Tian; Løvås, Terese; Scherer, Viktor (Peer reviewed, 2018)In this study, a novel approach for the determination of the solid mass yield from slow pyrolysis based on a comparison of the volatile matter contents of feedstock and char is presented. The approach was tested with ... -
An evaluation of effects of fuel parameters and flue gas recirculation on NOx emissions through detailed chemical kinetics simulations
Skreiberg, Øyvind; Li, Tian; Wang, Liang; Bugge, Mette; Løvås, Terese (Journal article; Peer reviewed, 2019)In this work the effects of fuel parameters and under grate flue gas recirculation (FGR) are investigated when applying staged air combustion of solid fuel for the purpose of NOx reduction. In addition to temperatures, ... -
An evaluation of effects of operational parameters on NOx emissions through detailed chemical kinetics simulations
Skreiberg, Øyvind; Li, Tian; Vantaggiato, Elettra; Wang, Liang; Bugge, Mette; Løvås, Terese (Journal article; Peer reviewed, 2019)NOx emissions from biomass and Municipal Solid Waste (MSW) combustion is a great concern. Technologies for reducing NOx emissions based on flue gas cleaning using e.g. Selective Non-Catalytic Reduction (SNCR) or Selective ... -
An SEM-EDX Study of Forest Residue Chars Produced at High Temperatures and High Heating Rate
Wang, Liang; Li, Tian; Matas, Berta Güell; Løvås, Terese; Sandquist, Judit (Journal article; Peer reviewed, 2015)This work investigated morphology, structure and chemical transformation of forest residue chars devolatilized in a drop tube reactor at high heating rates and high temperature conditions. Produced forest residue chars ... -
Assessment of Transient NOx Reduction Potential in Wood Stoves
Skreiberg, Øyvind; Li, Tian; Bugge, Mette; Haugen, Nils Erland L (Journal article; Peer reviewed, 2020)NOx emissions from wood stoves remain a significant concern, even though modern wood stoves are continuously improved regarding emissions due to incomplete combustion, e.g. particulates of organic origin. Today, state of ... -
CFD-DEM simulation of biomass gasification with steam in a fluidized BEd reactor
Ku, Xiaoke; Li, Tian; Løvås, Terese (Journal article; Peer reviewed, 2015)A comprehensive CFD–DEM numerical model has been developed to simulate the biomass gasification process in a fluidized bed reactor. The methodology is based on an Eulerian–Lagrangian concept, which uses an Eulerian method ... -
CO2 Gasification of Chars Prepared by Fast and Slow Pyrolysis from Wood and Forest Residue: A Kinetic Study
Wang, Liang; Li, Tian; Várhegyi, Gábor; Skreiberg, Øyvind; Løvås, Terese (Journal article; Peer reviewed, 2017)The CO2 gasification of chars was investigated by thermogravimetric analysis (TGA). The chars were prepared from spruce and its forest residue. Prior to the gasification, the raw materials were pelletized and pulverized. ... -
Cold flow characteristics of a novel bluff body hydrogen burner
Meraner, Christoph; Li, Tian; Ditaranto, Mario; Løvås, Terese (Journal article; Peer reviewed, 2018)The cold flow characteristics of a novel partial premixed bluff body (PPBB) low NOx burner, capable of operating with hydrogen as well as methane-hydrogen blends, were investigated numerically. The PPBB burner features a ... -
Computational fluid dynamic simulations of thermochemical conversion of pulverized biomass in a dilute flow using spheroidal approximation
Guo, Ning; García Llamas, Ángel David; Li, Tian; Umeki, Kentaro; Gebart, Rikard; Løvås, Terese (Peer reviewed; Journal article, 2020)A drag force model for spheroids, referred as the spheroid model, was implemented in OpenFOAM, in order to better predict the thermochemical conversion of pulverized biomass. Our previous work has found that the spheroid ... -
Conversion of solid reacting particles in a non-premixed double shear layer
Zareba, Patrycja Dominika (Master thesis, 2018)As the increasing the efficiency of the combustion processes is crucial nowadays, a fundamental understanding of this process is required. This thesis is focusing on the effect of turbulence on the conversion rate of solid ... -
Dimensional Decomposition of Turbulent Reacting Flows
Grøvdal, Fredrik; Sannan, Sigurd; Meraner, Christoph; Li, Tian; Løvås, Terese (Peer reviewed; Journal article, 2020)A dimensional-decomposition approach, decomposing 3D into 3×1D for turbulent (reacting) flows are motivated, discussed and investigated. In the three-dimensional Linear Eddy Model (LEM3D), three orthogonally intersecting ... -
Effects of scaling laws on the combustion and NOx characteristics of hydrogen burners
Meraner, Christoph; Li, Tian; Ditaranto, Mario; Løvås, Terese (Peer reviewed; Journal article, 2020)This paper proposes a novel bidirectional linkage between a long-term energy system model and an operational power market model. This combined modelling framework provides long-term energy system investment strategies that ... -
Eulerian-Lagrangian simulation of pulverized biomass jet using spheroidal particle approximation
Guo, Ning; Li, Tian; Zhao, Lihao; Løvås, Terese (Journal article; Peer reviewed, 2019)Pulverized biomass has great potential to replace coal in many industrial systems such as suspension-firing furnaces and entrained-flow gasifiers. The shape of pulverized biomass deviates significantly from the quasi-spherical ... -
Eulerian–Lagrangian Simulation of Biomass Gasification Behavior in a High-Temperature Entrained-Flow Reactor
Ku, Xiaoke; Li, Tian; Løvås, Terese (Journal article; Peer reviewed, 2014)In this paper, a multiscale Eulerian–Lagrangian CFD model based on OpenFOAM has been constructed, which takes into account heat and mass transfer, pyrolysis, homogeneous and heterogeneous reactions, radiation, as well as ... -
Gasification of Biomass for Second Generation Biofuel Production
Li, Tian (Doctoral thesis at NTNU;2015:77, Doctoral thesis, 2015)Gasification of biomass is perceived as one of the most attractive thermochemical processes to produce carbon neutral syngas that can be burned to release energy or used as the building blocks for the production of ... -
Gasification of High Heating-rate Biomass-derived Chars at Elevated Temperatures
Li, Tian; Niu, Yanqing; Wang, Liang; Løvås, Terese (Journal article; Peer reviewed, 2017)In this study, gasification behavior of high heating-rate chars were investigated using an entrained flow reactor with an optical particle-sizing pyrometer. Two biomass chars produced from forest residue and torrefied ... -
Grid-independent Eulerian-Lagrangian approaches for simulations of solid fuel particle combustion
Zhang, Jingyuan; Li, Tian; Ström, Henrik; Løvås, Terese (Journal article; Peer reviewed, 2020)In this study, a computational fluid dynamics (CFD) model with three coarse graining algorithms is developed with the implementation of a layer based thermally thick particle model. Three additional coupling methods, cube ... -
High temperature gasification of high heating-rate chars using a flat-flame reactor
Li, Tian; Niu, Yanqing; Wang, Liang; Shaddix, Christopher; Løvås, Terese (Journal article; Peer reviewed, 2018)The increasing interest in gasification and oxy-fuel combustion of biomass has heightened the need for a detailed understanding of char gasification in industrially relevant environments (i.e., high temperature and ... -
Influence of drag force correlations on periodic fluidization behavior in Eulerian-Lagrangian simulation of a bubbling fluidized bed
Ku, Xiaoke; Li, Tian; Løvås, Terese (Journal article; Peer reviewed, 2013)In this paper, an Eulerian–Lagrangian approach, in which the gas flow is solved by the volume-averaged Navier–Stokes equation and the motion of individual particles is obtained by directly solving Newton's second law of ...