2 edition of Devolatilization of coal in a fixed bed reactor found in the catalog.
Devolatilization of coal in a fixed bed reactor
Ashokkumar J. Gokhale
Written in English
|Statement||by Ashokkumar J. Gokhale.|
|The Physical Object|
|Pagination||ix, 103 leaves, bound :|
|Number of Pages||103|
A comparison between the properties of chars produced by pyrolysis of rice husk and eucalyptus at different temperatures and heating rates has been performed. Low heating rate (LHR) devolatilization experiments were conducted in a fixed bed reactor at temperatures ranging from to °C, while a fluidized bed reactor Cited by: By Chun Zhang, Rongcheng Wu, Erfeng Hu, Shuyuan Liu and Guangwen Xu. Cite. BibTex; Full citation.
A Computational Fluid Dynamic model of oxy-coal devolatilization experiments in a pilot-scale entrained flow reactor is proposed to gain insight into the thermal histories of the cloud of solid fuel particles and to investigate sources of uncertainties that may affect the analysis of devolatilization Cited by: 2. A laboratory scale fixed bed coal gasifier was designed to simulate the conditions existing in the devolatilization zone of an air blown Lurgi type fixed bed coal gasifier. Devolatilization behavior of a .
J. Khan and T. Wang, "Implementation of a Demoisturization and Devolatilization Model in Multi-Phase Simulation of a Hybrid Entrained-Flow and Fluidized Bed Mild Gasifier," International Journal of Clean Coal Cited by: 4. Fixed Bed Gasification of Coal, 79 The Principle of Fixed Bed Gasification, 79 The Classification of Fixed Bed Gasification Technology, 81 Typical Fixed Bed Gasification Technologies, 81 The Key Equipment for Pressurized Fixed Bed Gasifier, 85 The Application and Improvement of Pressurized Fixed Bed .
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Posed for bituminous coal is depicted in Figure 1. It is observed in this ﬁgure that the coal is composed of groups of aromatic ring clusters that are cross-linked Figure 1.
Structure of bituminous coal . Borah, P. Ghosh and P. Rao Devolatilization of coal in ﬂuidized bed. Co-pyrolysis of beech wood and Zhundong brown coal are carried out in a fluidized bed reactor working under a numerical model, and the effects of blending ratio and fast pyrolysis temperature on.
Thus, in the present work, the devolatilization time is taken as the time from the introduction of the fuel particle into the bed until its center temperature attains 95% of the bed temperature.
Figure 15 presents the devolatilization times Cited by: in the bed material and cyclone ash after completion of one reac-tion run. The experimental variables and their ranges used in this study are summarized in Table 2. RESULTS AND DISCUSSION Devolatilization of coal was carried out in a fluidized bed reac-tor at oC.
The nitrogen to air ratio. A detailed one-dimensional transient model is developed to describe the conversion of a single fuel particle in O2/N2 and O2/CO2 atmospheres in a fluidized bed (FB). The model takes into account the Cited by: The model accounts for the rates of drying, fuel devolatilization, homogeneous combustion of volatiles in a thin flame, heterogeneous combustion of char, and mass and heat transfer, the latter involving the heat transfer from the FB reactor Cited by: The model is then applied to the devolatilization of biomass in a fluidized bed, in which attention is focused on heat transfer, particle mixing and elutriation, and gas production.
This work aims to investigate the devolatilization characteristics of coal in oxy-steam combustion and clarify the potential effects of steam and CO2 on the char characteristics. Chars of a Chinese lignite were prepared in a fixed-bed reactor Cited by: In updraft fixed bed gasifiers, the fuel is fed from the top while air is blown into the bottom of the reactor.
This arrangement can withstand biomass of higher moisture content (up to 40–50%) . Fixed bed reactors (Fig. ) are the simplest type pf reactor to design, and consist of solid catalyst particles being loaded and packed into the r, there are often problems faced with the plastic feed such as high viscosities, low thermal conductivities, and irregular shape when being placed inside the reactor.
The coal chars were prepared by devolatilization in a novel pressurized fixed-bed reactor. The pyrolysis experiments were carried out isothermally at temperatures of, and Cited by: K 2 CO 3 ‐catalyzed steam gasification of low‐rank coal in a fixed bed reactor was investigated in order to elucidate the effects of temperature and catalyst loading amounts on hydrogen yield.
The optimum conditions for H 2 ‐rich syngas were g kg −1 coal Cited by: 3. A one dimension, two phase model for the transfer of coal into gas through the Lurgi pressure gasification process is discussed.
Calculations for drying, devolatilization, and gasification Author: B. Hoersgen, H. Koehne. project. This project presents a specified design of a small-scale fixed-bed reactor for the purpose of investigating the gasification processes of biomass and municipal solid wastes.
Gas extraction ports are evenly distributed along the height of the reactor. Coal devolatilization is a process in which coal is transformed at elevated temperatures to produce gases, tar* and char.
Gas formation can be related to the thermal decomposition of specific. With utilization of internals to enhance heat transfer and regulate the pyrolysis gas flow direction inside the reactor, this study proposed and tested a new fixed-bed coal pyrolysis reactor Cited by: All pyrolysis tests were carried out in a stream of high-purity He (N%) in a fixed bed quartz reactor.
A schematic diagram of the quartz reactor used is shown in Fig. The reactor was made of. Coal-Water Fuels Coal-Biomass Fuels References Combustion Systems Introduction Combustion Systems Stoker Systems Fixed Bed Systems Fluidized Beds Entrained Systems Miscellaneous Systems Fuel Feeders References Gasification Introduction General Aspects Coal DevolatilizationFile Size: 1MB.
IV Publications and Conferences Publications ISI S. Sommariva, T. Maffei, G. Migliavacca, T. Faravelli, E. Ranzi, A predictive multi- step kinetic model of coal devolatilization, Fuel 89 () – S. Sommariva, R. Grana, T. Maffei, S. Pierucci, E. Ranzi A kinetic approach to the mathematical model of fixed bed.
Request PDF | Fragmentation Model of Coal Devolatilization in Fluidized Bed Combustion | Devolatilization is the release of volatile compounds from coal matrix by thermal decomposition.
The coal chars were prepared by devolatilization in a novel pressurized fixed-bed reactor. The pyrolysis experiments were carried out isothermally at temperatures of, and °C and.Data on devolatilization kinetics were obtained in a lami- nar flow reactor for two lignites and a subbituminous coal, under rapid heating conditions (3X10 °C/sec), over a low to intermediate range of temperatures ( to °C) and rapid quenching (^10 °C/sec) conditions, at residence times between and msec.
Weight losses of the three coals .Devolatilization of wood particles in a hot fluidized bed: Product yields and conversion rates Article in Biomass and Bioenergy 32(12) December with Reads How we measure 'reads'.