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Modeling Biomass Gasification in Circulating Fluidized .

Sadaka et al. (2002) developed a two phase biomass air‐steam gasification model for fluidized bed reactors and performed a sensitivity analysis to test its response to variations in fluidization .

Gasification of bio-oil and bio-oil/char slurry - UBC .

Kinetics of the reaction of steam with chars was studied using a thermo-gravimetric analyzer. Slurry Char was produced by pyrolysis of an 80 wt% bio-oil/20 wt% char mixture at nominal heating rates of 100–10,000°C/s. The resulting Slurry Char was subjected to steam gasification with 10–50 mol% steam at .

Simulation of Syngas Production from Municipal Solid Waste .

A synthetic natural gas (syngas) production study via municipal solid waste (MSW) gasification system in a circulating fluidized bed gasifier is presented with the aim to produce clean energy.

Frontiers | Gasification of Miscanthus x giganteus Pellets .

Gasification of Miscanthus x giganteus (Mxgig), is highly promising due to the high efficiency of the process and the many advantageous properties of this crop. Pilot-scale, fixed bed gasification studies were performed utilizing this fuel at three temperatures (750, 850, and 950°C) to determine the process effects of temperature on gas quality and tar yields.

Sustainable Technologies for Small-Scale Biochar .

Within fluidized bed reactors, the biomass is mixed with a hot sand bed fluidized by a gas which keeps the mixture rotating within the reactor. The attrition between biomass particles and sand particles doesn't make fluidized beds a better choice for biochar production because there is a higher carbon conversion to gases than to solid char.

Experimental Evaluation of Napier Grass Gasification in an .

Air gasification of Napier grass (NG) was studied with the target of producing combustible synthesis gas to be used in direct combustion for power generation. A small-scale autothermal bubbling fluidized bed gasifier was used to investigate the effect of reactor temperature, equivalence ratio (ER), and static bed height (SBH) on gasification performance and combustibility of the producer gas.

Product Distribution from Pyrolysis of Wood and .

The pyrolysis characteristics of agricultural residues (wheat straw, olive husks, grape residues, and rice husks) and wood chips have been investigated on a bench scale. The experimental system establishes the conditions encountered by a thin (4 × 10-2 m diameter) packed bed of biomass particles suddenly exposed in a high-temperature environment, simulated by a radiant furnace.

Gasification of bio-oil and bio-oil/char slurry - UBC .

Kinetics of the reaction of steam with chars was studied using a thermo-gravimetric analyzer. Slurry Char was produced by pyrolysis of an 80 wt% bio-oil/20 wt% char mixture at nominal heating rates of 100–10,000°C/s. The resulting Slurry Char was subjected to steam gasification with 10–50 mol% steam at .

Microwave pyrolysis of lignocellulosic biomass––a .

Fast pyrolysis which is characterized by very high heating rate with short vapor residence time of normally less than 2 s and rapid cooling can be performed in an array of reactor designs (e.g., bubbling or circulating fluidized bed) to rapidly heat biomass to reaction temperature (400–600 °C).

Effect of torrefied wood biomass under an oxidizing .

Char production is a measure of the fraction of initial biomass feed into the gasifier that is not converted to syngas; this results in a gasification process that is inefficient (Martínez et al. 2012, Lenis et al. 2016). The response variables analyzed were the syngas composition, reaction temperature (gasification process temperature), and .

Influence of Reaction Atmosphere (H2O, N2, H2, CO2, CO) on .

Secondary pyrolysis in fluidized bed fast pyrolysis of biomass is the focus of this work. A novel computational fluid dynamics (CFD) model coupled with a comprehensive chemistry scheme (134 species and 4169 reactions, in CHEMKIN format) has been developed to investigate this complex phenomenon. Previous results from a transient three-dimensional model of primary pyrolysis were .

An experimental and numerical investigation of Fluidized .

Model Description The fluidized bed gasification model is comprised of a number of Aspen reactor blocks. In order to show the overall gasification process, there are different phases considered in the Aspen Plus simulation, these being drying, pyrolysis (decomposition), volatile reactions, char gasification, and gas-solid separation.

Microwave pyrolysis of lignocellulosic biomass––a .

Fast pyrolysis which is characterized by very high heating rate with short vapor residence time of normally less than 2 s and rapid cooling can be performed in an array of reactor designs (e.g., bubbling or circulating fluidized bed) to rapidly heat biomass to reaction temperature (400–600 °C).

Big problem, little answer: overcoming bed agglomeration .

Fig. 2 depicts the effect of temperature on the rate of bed agglomeration. This is where the gasification reactor sustains a steady pressure until a sudden drop is observed after the period described in Table 2.Unlike reactions at 750 °C and 850 °C there was no indication of bed agglomeration at 920 °C until an immediate drop, this means that the formation of eutectic mixtures and the .

Technology Assessment Report Aqueous Sludge Gasification .

----- LIST OF FIGURES Figure 1 - Project Participants 4 Figure 2 - Summary of Waste Water Solids Management in the U.S.1 5 Figure 3 - Conventional paper mill sludge disposal practices in the U.S.13 6 Figure 4 - Example Gasification System 9 Figure 5 - Diagram of the zones in an updraftand downdraft gasifier 10 Figure 6 - Two types of fluidized-bed processes; Bubbling bed (left] and circulating .

Energies | Free Full-Text | A Review of Sludge-to-Energy .

Lower ER promotes incomplete gasification with high liquid tar and solid char fractions as end product whereas higher ER leads to a well oxidized environment that enhances complete combustion of a higher fraction of the char and tar, thereby generating more CO 2, H 2 O and heat energy at the expense of synthesis gas and their calorific value .

Speciation of Sulfur in Biochar Produced from Pyrolysis .

Aug 05, 2014 · The vapors and biochar produced from the fluidized-bed reactor flowed through an entrained flow reactor for secondary cracking and gasification at 850 °C. The ash and biochar produced were separated from the pyrolysis vapor or syngas stream by cyclonic separators and then cooled, collected, and weighed.

Air gasification of char derived from pongamia de-oiled .

When pyrolysis at the bed surface was followed by char gasification inside the dense bed the char gasification rate was up to 2-fold lower than the other combinations of the fuel axial location .

Gasification of Wood Bio-Oi | IntechOpen

In air/steam gasification process the essential steps are pyrolysis, partial oxidation, cracking of tar, solid carbon residue gasification, reforming (steam and/or dry), and water gas shift to yield syngas, water, carbon dioxide, and unwanted products like tars, methane and carbon (Levenspiel et al., 2005).

US20060185246A1 - Integrated whole bale feed plasma .

A method for gasifying a wide variety of biomass into hydrogen and carbon monoxide (syngas) using plasma torch technology. Generally, biomass is converted into syngas by feeding biomass into a reaction chamber, directing the beam of a plasma torch across the face of the biomass in the chamber, and extracting hydrogen and carbon monoxide rich gas from the reaction chamber.

Implementation of a Demoisturization and Devolatilization .

A mild gasification process has been implemented to provide an alternative form of clean coal technology called the Integrated Mild Gasification Combined Cycle (IMGCC), which can be utilized to build a new, highly efficient, and compact power plant or to retrofit an existing coal-fired power plant in order to achieve lower emissions and significantly improved thermal efficiency.

Speciation of Sulfur in Biochar Produced from Pyrolysis .

Aug 05, 2014 · Introduction. Lignocellulosic biomass is a renewable carbon source. 1 Pyrolysis 2−4 and gasification 5−7 are thermochemical processes that treat biomass feedstock with heat to produce intermediates that can be converted to liquid fuels with the aid of catalysts. 1,8,9 In addition to these intermediates, thermochemical processes also convert a fraction of the biomass to biochar.

The pyrolytic behavior of cellulose in lignocellulosic .

The outstanding contribution on a study of cellulose pyrolysis in a fluidized bed reactor was made by the research group led by Scott and Piskorz at the University of Waterloo in Canada. 12,17,42,46,61–63 A bench scale atmospheric pressure fluidized bed unit using sand as the fluidized solid with a feeding rate of 30 g h −1 of biomass was .

Energies | Free Full-Text | Investigation of the Formation .

Thermal conversion of ash-rich fuels in fluidized bed systems is often associated with extensive operation problems caused by the high amount of reactive inorganics. This paper investigates the behavior of wheat straw lignin—a potential renewable fuel for dual fluidized bed gasification. The formation of coherent ash residues and its impact on the operation performance has been investigated .

Biomass Pyrolysis | Pyrolysis | Gasification | Avaliação .

High liquid yields (60 to 75 percent weight of wood on a dry basis) can be typically achieved. Small fuel particle sizes are needed (< 2-3 mm) to ensure high heat rates. The rate of particle heating is the rate limiting factor. Figure 2 shows a fluidized bed pyrolysis reactor developed by Daugaard (2003).

Integration of biocrude production from fast pyrolysis of .

The DynaMotive process uses a bubbling fluidized bed and produces yields of bio-oil (50–75 wt%), char (15–20 wt%) and non-condensable gases (10–20 wt%) depending upon the feedstock . A fourth product, BioOil Plus, can be produced by adding back the separated char into the bio-oil, in a finely ground form of ~8 µ in size [ 18 ].

(PDF) Biofuels Production by Biomass Gasification: A Review

Syngas composition varies according to the gasification technology used (such as fixed bed reactors, fluidized bed reactors, entrained flow reactors), the feedstock characteristics, and the .

An experimental and numerical investigation of Fluidized .

Model Description The fluidized bed gasification model is comprised of a number of Aspen reactor blocks. In order to show the overall gasification process, there are different phases considered in the Aspen Plus simulation, these being drying, pyrolysis (decomposition), volatile reactions, char gasification, and gas-solid separation.

Biomass fast pyrolysis in a fluidized bed reactor under N2 .

Mar 01, 2011 · Fig. 2 shows the product yields of corncob fast pyrolysis in the fluidized bed reactor under N 2, CO 2, CO, CH 4 and H 2 atmospheres. As shown in Fig. 2a, corncob fast pyrolysis under CO atmosphere gave a total liquid yield of 49.6%, which is the lowest compared to 57.1%, 55.3%, 58.7% and 56.4% obtained under N 2, CO 2, CH 4 and H 2 atmospheres, .

Pyrolysis Reactors - IEA Bioenergy

The rotating cone reactor has many similarities except that the sand and biomass transport is effected by centrifugal forces operating in a rotating cone. Circulating fluid bed reactor Reactors – Ablative pyrolysis. Ablative pyrolysis is substantially different in concept compared to the other methods of fast pyrolysis.