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The paper reports on experiments of glucose gasification with water near critical point. The adoption of these process conditions revealed advantages in terms of biomass conversion efficiency as the resulting liquid phase includes some important compounds (HFM, furfural). Tree phases were produced, collected and then analysed: solid (23% w/w) liquid (70%) and gas (7%). The predominance of non gaseous...
This paper investigates the characteristics of the near field of the granular jet (e.g., diameter of granular jet core d c , width of dispersed jet d, and thickness of boundary layer δ). Through image analysis, we find that particle superficial velocity has an important influence on those characteristics. In addition, d and δ linearly grow with the distance from the nozzle exit at first and...
The transport gasifier manufactured by Kellogg, Brown and Root (KBR) is reportedly capable of economically converting low rank coal (e.g. lignite) to syngas for the production of synthetic chemicals, fuels and energy. However no process simulation of the KBR transport gasifier yet exists in the public domain literature. In this work three alternative process simulation models of the transport gasifier...
In this article we present a parameter study for an Euler–Lagrangian model with application to wood gasification in fluidized beds. The bed material consists of charcoal and wood only. The detailed model involves processes of heat up, drying, particle shrinkage, primary and secondary pyrolysis, gasification, and tar decomposition. Initially we introduce a bidisperse mixture of 12,000 charcoal particles...
The aim of this work was to study separation of hydrogen from the main components of syngas, i.e. synthesis gas from gasification of e.g. coal, biomass or wastes. Experiments were performed in a bench-scale facility designed to treat up to 2m 3 h −1 (STP) at 873K, and 1.2MPa. A Pd-based membrane (O.D.=0.0254m; L=0.15m) from CRI Catalyst Co., US was used.Firstly the membrane was tested...
The objective of this research is to study the effect of the composite catalyst, FeCO 3 –Na 2 CO 3 , on gasification of a low-sulfur sub-bituminous Wyodak coal from the Powder River Basin (PRB) of Wyoming. The catalytic effects of the composite catalysts were evaluated by comparing their effluent gas compositions and carbon conversion kinetics to those achieved in the presence...
The ash fusion temperature (AFT) profile of a coal is one of the parameters currently widely used in coal marketing and utilization to assess coal ash fusibility and melting characteristics, and to predict the melting behaviour of the coal ash in coal conversion processes. However, the flow temperature of a specific coal source alone does not provide enough insight into the slag formation behaviour...
This paper introduces the experiences from the planning, installation and operation of a pilot-scale CO 2 capture and H 2 production plant. This Project is the main activity of ELCOGAS (owner of the Puertollano IGCC Power Plant) in relation to carbon capture topic.With the aim to demonstrate the feasibility of capture of CO 2 and production of H 2 in an IGCC, as well...
Hydrogen as a gasification product gas is always present in a practical gasifier. Its inhibition of char gasification is always an important consideration in the design and operation of the gasifier. This study aims to provide further insights into the roles of hydrogen during gasification by characterising the chars at varying levels of conversion using FT-Raman spectroscopy. The char samples were...
The paper investigates the technical feasibility of an air gasification process of a Solid Recovered Fuel (SRF) obtained from municipal solid waste. A pilot scale bubbling fluidized bed gasifier, having a feedstock capacity of about 70kg/h and a maximum thermal output of about 400kW, provided the experimental data: the complete composition of the syngas (including the tar, particulate and acid/basic...
A two-zone solar reactor concept for the steam-based gasification of biomass particles using concentrated solar energy has been developed and experimentally evaluated with particles of sugarcane bagasse at a 1.5kW solar input scale. The gasifier has been designed with the objective to provide pyrolysis and gasification conditions yielding high carbon conversion into syngas and suppressing the formation...
Char structure is one of the important factors influencing the char reactivity during gasification. The purpose of this study is to investigate the effects of gasification atmosphere and temperature on the changes of char structure during gasification. In this study, a Collie sub-bituminous coal from Western Australia was gasified in a fluidised-bed/fixed-bed reactor at 800–900°C in three gasification...
Steam gasification of biomass integrated with CO 2 capture in a dual fluidized bed with carbon sequestration is among the promising technologies being developed for sustainable production of hydrogen. A simple steady state model which considers two coupled reactors, one calcining limestone particles, while the other steam gasifies biomass and simultaneously carbonates the lime sorbent, is...
Counter-flow packed bed gasification was carried out featuring a combination of downdraft and updraft operation modes. A column reactor of inside diameter 102mm and 1000mm height was used. Downdraft and updraft air supply were varied while the total air supply was maintained constant. Counter-flow gasification with downdraft air supply at 12L/min and updraft air at 4L/min offered optimal conditions,...
CFD modeling results for entrained flow coal gasification using advanced submodels for coal conversion are presented and compared to detailed experimental data. The focus of this investigation is on the accurate modeling of the char conversion process. The CBK/E and CBK/G models are used for calibrating a simplified Single Nth-Order Reaction (SNOR) kinetic model, which is suitable for CFD calculations...
The design of an efficient biomass gasifier is essential for the development and practical realization of biomass-to-fuels processes. The study of pine charcoal steam/oxygen gasification in a top-lit downdraft moving-hearth gasifier is presented in this paper. A thermodynamic analysis of the charcoal (C)–H 2 O–O 2 system was conducted and the composition of the product gas, its lower...
The objective of this study is to measure apparent rate parameters for pinewood char gasification with CO 2 using large particles with relevance to practical gasifiers. The novel features of this work include: (1) char gasification for CO 2 recycling, which is studied less in the past than char gasification in other environments, (2) independent measurements involving gravimetric analyses...
Miscanthus×giganteus (M×G) was torrefied to improve its thermal and physical properties prior to thermal conversion. Torrefaction was undertaken at a series of temperatures from 230 to 290°C for residence times varying from 10 to 30min and the product biomass was characterized in terms of it is suitability as a feedstock for gasification. The properties of the torrefied M×G were improved following...
How a catalyst would speed up gasification is fundamentally important for the development of efficient gasification technologies. It is particularly crucial for the efficient use of catalytic species inherently present in low-rank coal and biomass. This study aims to gain insights about the catalytic gasification reaction mechanisms through tracing the changes in char structure during gasification...
This study aims to investigate the roles of char in the in situ destruction of tar during the volatile–char interactions. Rice straw and water/acid-washed rice straw samples were pyrolysed at 850°C with controlled extents of volatile–char interactions in a fluidised-bed/fixed-bed reactor. Our results indicate that the amount of tar decreases significantly with increasing extent of volatile–char interactions...
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