Residence Time Influence on the Fast Pyrolysis of Loblolly Pine Biomass

2010 ◽  
Vol 132 (4) ◽  
Author(s):  
J. Rhett Mayor ◽  
Alexander Williams
Keyword(s):  
Thermogravimetric Analysis ◽  
Pinus Taeda ◽  
Residence Time ◽  
Loblolly Pine ◽  
Fast Pyrolysis ◽  
Residence Times ◽  
Pyrolysis Process ◽  
Heating Rates ◽  
Degradation Model ◽  
Two Component

Bio-oils were produced within a fast pyrolysis microreactor at 400°C from Pinus taeda (Loblolly pine) with varying residence times. This study has considered six residence times, evaluating the products of the reaction between 10 s and 120 s. The collected bio-oils and solids were analyzed for their calorific values and yields. Heating rates greater than 100°C/s were achieved, allowing for isothermal conditions throughout the majority of the reaction despite short residence times. The predictive capabilities of thermogravimetric analysis derived Arrhenius coefficients are evaluated and a new two component degradation model is empirically derived, showing a much improved representation of the fast pyrolysis process.

Investigation Into the Effects of Reaction Duration on the Isothermal Fast Pyrolysis of Biomass

2009 ◽  
Author(s):  
J. Rhett Mayor ◽  
Alexander Williams
Keyword(s):  
Loblolly Pine ◽  
Energy Content ◽  
Biomass Conversion ◽  
Fast Pyrolysis ◽  
Residence Times ◽  
Heating Rates ◽  
Reaction Duration ◽  
Bio Oil ◽  
Pyrolysis Of Biomass ◽  
Conversion Efficiencies

Bio-oils were produced within a fast-pyrolysis micro-reactor at 400°C from Loblolly Pine (Pinus Taeda) with varying residence times. This preliminary study has considered two boundary values for the residence time, evaluating the products of the reaction at 20 seconds and 120 seconds. The collected bio-oils were analyzed for their calorific values (LHV) and biomass conversion efficiencies. Heating rates greater than 100°C/s were achieved for the biomass, allowing for isothermal conditions to exist throughout the majority of the reaction despite short residence times. This study shows the effect that reaction duration has on the mass of the bio-oil yield and energy content present for the isothermal fast pyrolysis of Loblolly Pine and evaluates the predictive capabilities of TGA derived Arrhenius coefficients.

scholarly journals Pre-Treatment of Furniture Waste for Smokeless Charcoal Production

Materials ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3188
Author(s):  
Paweł Kazimierski ◽  
Paulina Hercel ◽  
Katarzyna Januszewicz ◽  
Dariusz Kardaś
Keyword(s):  
Oriented Strand Board ◽  
Raw Materials ◽  
Medium Density Fiberboard ◽  
Fast Pyrolysis ◽  
Pyrolysis Product ◽  
Pyrolysis Process ◽  
Heating Rates ◽  
Charcoal Production ◽  
Pyrolysis Products ◽  
Slow Pyrolysis

The aim of this study was to assess the possibility of using furniture waste for smokeless fuel production using the pyrolysis process. Four types of wood-based wastes were used in the pyrolysis process: pine sawdust (PS), chipboard (CB), medium-density fiberboard (MDF), and oriented strand board (OSB). Additionally, the slow and fast types of pyrolysis were compared, where the heating rates were 15 °C/min and 100 °C/min, respectively. Chemical analyses of the raw materials and the pyrolysis product yields are presented. A significant calorific value rise was observed for the solid pyrolysis products (from approximately 17.5 MJ/kg for raw materials up to approximately 29 MJ/kg for slow pyrolysis products and 31 MJ/kg for fast pyrolysis products). A higher carbon content of char was observed in raw materials (from approximately 48% for raw materials up to approximately 75% for slow pyrolysis products and approximately 82% for fast pyrolysis products) than after the pyrolysis process. This work presents the possibility of utilizing waste furniture material that is mostly composed of wood, but is not commonly used as a substrate for conversion into low-emission fuel. The results prove that the proposed solution produced char characterized by the appropriate properties to be classified as smokeless coal.

Study on Volatile Evolution during the Eucalyptus Pyrolysis by Using TG-FTIR Analysis

2014 ◽  
Vol 884-885 ◽  
pp. 148-153
Author(s):  
Dian Zheng Fu ◽  
Ye Tang ◽  
Zheng Hui Fu ◽  
Hong Liang Zhang ◽  
Wei Li
Keyword(s):  
Fourier Transform ◽  
Thermogravimetric Analysis ◽  
South China ◽  
Volatile Matter ◽  
Infrared Analysis ◽  
Ftir Analysis ◽  
Pyrolysis Process ◽  
Heating Rates ◽  
Pyrolysis Products ◽  
Decomposition Stage

In this study, thermogravimetric analysis coupled with Fourier transform infrared analysis (TG-FTIR) was used to studying the volatile evolution characteristic during the eucalyptus pyrolysis from South China. The thermogravimetric analysis results indicate that the pyrolysis of eucalyptus occurred in three main stages which are the moisture vaporization stage, the volatile matter release stage and the char decomposition stage. The major gases evolved during the pyrolysis process were identified to be H2O, CO, CO2, CH4. In addition, the effects of different heating rates on the emissions of these pyrolysis products have been studied.

An Investigation on the Interaction between Biomass and Coal during their Co-Pyrolysis

2019 ◽  
Vol 797 ◽  
pp. 299-308
Author(s):  
Engamba Esso Samy Berthold ◽  
Shun Li Fang ◽  
Yan Ting Xue ◽  
Yi Wang ◽  
Zhe Xiong ◽  
...  
Keyword(s):  
Thermogravimetric Analysis ◽  
Synergistic Effect ◽  
Rice Husk ◽  
Fast Pyrolysis ◽  
Pyrolysis Process ◽  
Oxygenated Compounds ◽  
Aromatic Components ◽  
Oil Characterization ◽  
Predicted Values ◽  
Auger Reactor

This study aims to investigate the interaction during the co-pyrolysis of Cangzhou coal and sawdust/rice husk. The synergistic is analyzed in the thermal behavior of the blends and the kinetics by thermogravimetric analysis (TG), also in the products yield (oil and char) from the fast co-pyrolysis and the oil characterization by GC-MS and UV fluorescence spectroscopy. Firstly TG experiment indicated the synergistic effect occurs during the co-pyrolysis process of the coal and rice husk occurs during the all the main pyrolysis (300-550°C) and that of the sawdust between 300-410°C (for the 50:50 and the 75:25 blends) and 300-550°C (for the 25:75 blend). Then the co-fast pyrolysis in a novel auger reactor increased the oil yield compared to the predicted values. The synergistic interaction promoted the oxygenated compounds, limited the SOx emissions, was less reactive and did not promote the aromatic components.

scholarly journals Determination of the Thermodynamic Parameters of the Pyrolysis Process of Post-Consumption Thermoplastics by Non-Isothermal Thermogravimetric Analysis

Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4379
Author(s):  
Paul Palmay ◽  
Cesar Puente ◽  
Diego Barzallo ◽  
Joan Carles Bruno
Keyword(s):  
Thermogravimetric Analysis ◽  
Thermodynamic Parameters ◽  
Degradation Process ◽  
Nitrogen Atmosphere ◽  
Correlation Factor ◽  
Pyrolysis Process ◽  
Heating Rates ◽  
Exponential Factor ◽  
Isoconversional Models ◽  
The One

Currently, the pyrolysis process is an important technology for the final treatment of plastic waste worldwide. For this reason, knowing in detail the chemical process and the thermodynamics that accompany cracking reactions is of utmost importance. The present study aims to determine the thermodynamic parameters of the degradation process of conventional thermoplastics (polystyrene (PS), polyethylene terephthalate (PET), high-density polyethylene (HDPE), polypropylene (PP) and polyvinyl chloride (PVC)) from the study of their chemical kinetics by thermogravimetric analysis (TG). Non-isothermal thermogravimetry was performed at three heating rates from room temperature to 550 °C with an inert nitrogen atmosphere with a flow of 20 mL min−1. Once the TG data is obtained, an analysis is carried out with the isoconversional models of Friedman (FR), Kissinger-Akahira-Sunose (KAS), and Flynn-Wall-Ozawa (FWO) in order to determine the one that best fits the experimental data, and with this, the calculation of the activation energy and the pre-exponential factor is performed. The validation of the model was carried out using the correlation factor, determining that the KAS model is the one that best adjusts for the post-consumer thermoplastic degradation process at the three heating rates. With the use of the kinetic parameters, the variation of the Gibbs free energy is determined in each of the cases, where it is necessary that for structures containing aromatic groups a lower energy is presented, which implies a relative ease of degradation compared to the linear structures.

scholarly journals A Consensus Map for Loblolly Pine (Pinus taeda L.). I. Construction and Integration of Individual Linkage Maps From Two Outbred Three-Generation Pedigrees

Genetics ◽  
1999 ◽  
Vol 151 (1) ◽  
pp. 321-330 ◽  
Author(s):  
Mitchell M Sewell ◽  
Bradley K Sherman ◽  
David B Neale
Keyword(s):  
Pinus Taeda ◽  
Loblolly Pine ◽  
Fragment Length Polymorphism ◽  
Random Amplified Polymorphic Dna ◽  
Mapping Function ◽  
Genetic Maps ◽  
Linkage Data ◽  
Linkage Maps ◽  
Consensus Map ◽  
Pinus Taeda L

Abstract A consensus map for loblolly pine (Pinus taeda L.) was constructed from the integration of linkage data from two unrelated three-generation outbred pedigrees. The progeny segregation data from restriction fragment length polymorphism, random amplified polymorphic DNA, and isozyme genetic markers from each pedigree were recoded to reflect the two independent populations of parental meioses, and genetic maps were constructed to represent each parent. The rate of meiotic recombination was significantly greater for males than females, as was the average estimate of genome length for males {1983.7 cM [Kosambi mapping function (K)]} and females [1339.5 cM(K)]. The integration of individual maps allows for the synthesis of genetic information from independent sources onto a single consensus map and facilitates the consolidation of linkage groups to represent the chromosomes (n = 12) of loblolly pine. The resulting consensus map consists of 357 unique molecular markers and covers ∼1300 cM(K).

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