Effect of density on physicochemical and thermal conversion characteristic of Naomaohu coal

Fuel ◽  
2021 ◽  
Vol 284 ◽  
pp. 119045
Author(s):  
Tianju Chen ◽  
Ruowei Dai ◽  
Dominic Yellezuome ◽  
Ke Zhang ◽  
Ruidong Zhao ◽  
...  
Keyword(s):  
Thermal Conversion ◽  
Conversion Characteristic

Thermal Conversion Characteristic of Pelletized Jatropha Residue and Glycerol Waste

2009 ◽  
Author(s):  
Viboon Sricharoenchaikul ◽  
Duangduen Atong
Keyword(s):  
Solid Fuel ◽  
Thermal Conversion ◽  
Hydraulic Press ◽  
Fuel Pellet ◽  
Glycerol Content ◽  
Total Conversion ◽  
Synthetic Fuel ◽  
Conversion Characteristic ◽  
Conversion Time

Adverse environmental effects resulting from fossil fuel usage as well as foreseeable conventional energy depletion lead to the exploration of alternative fuel materials especially the renewable ones. In this work, characterization of synthetic fuel material formed by pelletization of Jatropha residue (physic nut) using glycerol waste as a binder was carried out in order to investigate the feasibility of utilizing these waste materials as another renewable energy source. Both wastes are by products from biodiesel manufacturing process. Synthetic fuel materials of Jatropha residue mixed with 0–50% glycerol waste were formed to length of about 11 mm and diameter of about 13 mm under pressure of 7 MPa in a hydraulic press. Maximum compressive stress (2.52×105 N/m2) of the fuel pellet occurred at 10% glycerol waste. Thermal conversion characteristic of solid fuel was studied by using single particle reactivity testing scheme at temperature of 500–900°C under partial oxidation atmosphere. In general, higher glycerol content in solid fuel as well as oxygen concentration in reacting gas resulted in greater decomposition rate from 0.006–0.110 g/sec. Burning started with a relative short drying phase, followed with a longer pyrolysis time and thereafter the dominated char combustion time which took around 35–57% of total conversion time. The average total conversion time varied from 26 to 288 sec, depended mainly on reaction temperature. Higher glycerol content resulted in char with lower density and higher shrinkage with greater porosity. Greatest changes in pellet diameter, height, and density of 75.6%, 89.2%, and 91.5%, respectively, were exhibited at 5% oxygen atmosphere and 900°C. The results suggested that Jatropha residue mixed with glycerol is suitable for utilization as quality solid fuel.

Calcium pyrophosphate powder synthesized from phosphoric acid and calcium carbonate

2020 ◽  
pp. 42-48
Author(s):  
Tatiana Safronova ◽  
◽  
Tatiana Shatalova ◽  
Snezhana Tikhonova ◽  
Yaroslav Filippov ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Phosphoric Acid ◽  
Functional Materials ◽  
Bone Defects ◽  
Thermal Conversion ◽  
Calcium Pyrophosphate ◽  
Molar Ratio

Powders of calcium pyrophosphate Ca2P2O7 in the form of γ- и β-modifications have been produced as a result of thermal conversion of brushite CaHPO4∙2H2O synthesized from phosphoric acid H3PO4 and calcium carbonate CaCO3 at the molar ratio P / Ca = 1.1. The resulting powders can be used for production of various functional materials including biocompatible and bioresorbable ones for the treatment of bone defects.

Activation of reactor graphite thermal conversion process with copper acetate

2021 ◽  
Author(s):  
Kirill B. Larionov ◽  
Albert Zh. Kaltaev ◽  
Vladimir E. Gubin ◽  
Andrey V. Zenkov
Keyword(s):  
Copper Acetate ◽  
Thermal Conversion ◽  
Conversion Process ◽  
Reactor Graphite

scholarly journals Green energy technology from buriti (Mauritia flexuosa L. f.) for Brazilian agro-extractive communities

2021 ◽  
Vol 3 (3) ◽  
Author(s):  
Munique Gonçalves Guimarães ◽  
Rafael Benjamin Werneburg Evaristo ◽  
Augusto César de Mendonça Brasil ◽  
Grace Ferreira Ghesti
Keyword(s):  
Lignin Content ◽  
Fixed Bed ◽  
Thermal Conversion ◽  
Volatile Matter ◽  
Matter Content ◽  
Green Energy ◽  
Fixed Bed Reactor ◽  
Gasification Process ◽  
Mauritia Flexuosa ◽  
Immediate Analysis

AbstractThe present work analyzed the energy generation potential of Buriti (Mauritia flexuosa L. f.) by thermochemical reactions. The experimental part of the study performed immediate analyses, elemental analyses, lignocellulosic analysis, thermogravimetric analysis, calorific values, and syn gas concentrations measurements of the gasification of Buriti in a fixed-bed reactor. Additionally, numerical simulations estimated the syn gas concentrations of the gasification reactions of Buriti. The immediate analysis showed that Buriti has the highest ash content (4.66%) and highest volatile matter content (85%) compared to other Brazilian biomass analyzed, but the higher heating value was only 18.28 MJ.kg−1. The elemental analysis revealed that the oxygen to carbon ratio was 0.51 while hydrogen to carbon ratio was 1.74, indicating a good thermal conversion efficiency. The Lignocellulosic analysis of Buriti resulted in a high content of holocellulose (69.64%), a lignin content of 28.21% and extractives content of 7.52%. The thermogravimetry of the Buriti indicated that the highest mass loss (51.92%) occurred in a temperature range between 150 °C and 370 °C. Lastly, the experimental gasification study in a fixed-bed updraft gasifier resulted in syn gas concentrations of 14.4% of CO, 11.5% of CO2 and 17.5% of H2 while the numerical simulation results confirmed an optimal equivalence ratio of 1.7 to maximize CO and H2 concentrations. Therefore, based on the results presented by the present work, the gasification process is adequate to transform Buriti wastes into energy resources. Graphic abstract

scholarly journals Does Mechanical Screening of Contaminated Forest Fuels Improve Ash Chemistry for Thermal Conversion?

2020 ◽  
Vol 34 (12) ◽  
pp. 16294-16301
Author(s):  
Marjan Bozaghian Bäckman ◽  
Anna Strandberg ◽  
Mikael Thyrel ◽  
Dan Bergström ◽  
Sylvia H. Larsson
Keyword(s):  
Thermal Conversion ◽  
Forest Fuels

scholarly journals Thermogravimetry of the Steam Gasification of Calluna vulgaris: Kinetic Study

Catalysts ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 657
Author(s):  
José María Encinar ◽  
Juan Félix González ◽  
Sergio Nogales-Delgado
Keyword(s):  
Kinetic Study ◽  
Raw Materials ◽  
Biomass Conversion ◽  
Calluna Vulgaris ◽  
Thermal Conversion ◽  
Positive Influence ◽  
Steam Gasification ◽  
Conversion Model ◽  
Oil Reserves ◽  
Shrinking Core

On account of the continuous decrease in oil reserves, as well as the promotion of sustainable policies, there is an increasing interest in biomass conversion processes, which imply the search for new raw materials as energy sources, like forestry and agricultural wastes. On the other hand, gasification seems to be a suitable thermal conversion process for this purpose. This work studied the thermogravimetry of the steam gasification of charcoal from heather (Calluna vulgaris) in order to determine the kinetics of the process under controlled reaction conditions. The variables studied were temperature (from 750 to 900 °C), steam partial pressure (from 0.26 to 0.82 atm), initial charcoal mass (from 50 to 106 mg), particle size (from 0.4 to 2.0 mm), N2 and steam volumetric flows (from 142 to 446 mL·min−1) and catalyst (K2CO3) concentration (from 0 to 10% w/w). The use of the shrinking core model and uniform conversion model allowed us to determine the kinetic parameters of the process. As a result, a positive influence of catalyst concentration was found up to 7.5% w/w. The kinetic study of the catalytic steam gasification showed activation energies of 99.5 and 114.8 kJ·mol−1 and order of reactions (for steam) of 1/2 and 2/3.

scholarly journals Thermal Conversion Characteristics of Molasses

ACS Omega ◽  
2021 ◽  
Author(s):  
Meheretu Jaleta Dirbeba ◽  
Anders Brink ◽  
Daniel Lindberg ◽  
Mikko Hupa ◽  
Leena Hupa
Keyword(s):  
Thermal Conversion
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