Biomass pyrolysis devolatilization kinetics of herbaceous and woody feedstocks

AbstractThis paper emphasises the analogous modelling of hardwood (acacia) pyrolysis. The impacts of physical characteristics of hardwood chips on the pyrolysis are examined through the conservation of biomass solid mass fraction. The ONORM standard chips of sizes ‘G30’ and ‘G50’ and their combination are individually tested in the pyrolysis reactor. In the analogous situation, the fixed bed is assumed to be a wooden slab with a porosity equivalent to the voidage of bed. Bulk density, bed length and porosity are several of the physical attributes of a fixed bed used to examine the variation in the hardwood solid mass across the fixed bed. To measure temperature, the four-temperature sensors separated from each other by 80 mm are fixed along periphery of a reactor. The heating element of 2 kWe is provided to initiate the biomass pyrolysis. The proposed model is also used to establish the relationship between the kinetics of pyrolysis and the structural properties of hardwood.

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Analyzing the kinetics of waste plant biomass pyrolysis via thermogravimetry modeling and semi-statistical methods

Bioresource Technology ◽

10.1016/j.biortech.2021.126181 ◽

2021 ◽

pp. 126181

Author(s):

Karol Postawa ◽

Hanna Fałtynowicz ◽

Jerzy Sczygieł ◽

Elżbieta Beran ◽

Marek Kułażski

Keyword(s):

Statistical Methods ◽

Plant Biomass ◽

Biomass Pyrolysis ◽

Kinetics Of

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APPLICATION OF THE BIOMASS PYROLISIS PRODUCTS AS A REBURNING FUEL FOR NITROGEN OXIDES REDUCTION: TESTING THE CHEMICAL KINETICS MECHANISM

Thermophysics and Thermal Power Engineering ◽

10.31472/ttpe.2.2020.10 ◽

2020 ◽

Vol 42 (2) ◽

pp. 92-98

Author(s):

S.G. Kobzar ◽

A.A. Khalatov

Keyword(s):

Nitrogen Oxides ◽

Chemical Kinetics ◽

Coal Combustion ◽

Mass Fraction ◽

Biomass Pyrolysis ◽

Pyrolysis Gas ◽

Pyrolysis Products ◽

Nitrogen Oxides Reduction ◽

Kinetics Of ◽

Pyrolysis Gases

The mechanisms of chemical kinetics of the Reburning process using pyrolysis gases as a reburn fuel are determined. It has been shown that CO, CO2, H2 have very little effect on the reduction of the nitrogen oxides under conditions characteristic for the coal combustion, and hydrocarbons play the major contribution to the reduction of the nitrogen oxides. The results of the test calculations showed that the process of the nitrogen oxides reduction by the biomass pyrolysis products can be calculated by a simplified mechanism of the chemical kinetics of the Reburning process by replacing hydrocarbons with one substance (with a close carbon/hydrogen ratio as in the real pyrolysis gas mixture), provided that the mass fraction of carbon is preserved, fed to the reduction of nitrogen oxides unchanged. This approach significantly reduces machine time and calculates the nitrogen oxides reducing efficiency by Reburning technology with an accuracy of 17%.

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The Potential of Multivariate Regression in Determining Formal Kinetics of Biomass Pyrolysis

Progress in Thermochemical Biomass Conversion ◽

10.1002/9780470694954.ch87 ◽

2008 ◽

pp. 1076-1090 ◽

Cited By ~ 1

Author(s):

S. Vlker ◽

Th. Rieckmann

Keyword(s):

Multivariate Regression ◽

Biomass Pyrolysis ◽

Formal Kinetics ◽

Kinetics Of

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Kinetics of Biomass Pyrolysis: a Reformulated Three-Parallel-Reactions Model

Industrial & Engineering Chemistry Research ◽

10.1021/ie020218p ◽

2003 ◽

Vol 42 (3) ◽

pp. 434-441 ◽

Cited By ~ 180

Author(s):

Joan J. Manyà ◽

Enrique Velo ◽

Luis Puigjaner

Keyword(s):

Biomass Pyrolysis ◽

Parallel Reactions ◽

Kinetics Of

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Thermo-Gravimetric Analysis and Kinetic Study of Biomass Pyrolysis

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.800.509 ◽

2013 ◽

Vol 800 ◽

pp. 509-516 ◽

Cited By ~ 1

Author(s):

Yong Sheng Fan ◽

Xiao Hua Li ◽

Yi Xi Cai ◽

Wei Dong Zhao ◽

Hai Yun Yin

Keyword(s):

Activation Energy ◽

Heating Rate ◽

Thermo Gravimetric Analysis ◽

Evaluation Methodology ◽

Gravimetric Analysis ◽

Pyrolysis Process ◽

Biomass Pyrolysis ◽

Thermo Gravimetric ◽

Exponential Factor ◽

Kinetics Of

In order to realize the optimization of pyrolysis process, the pyrolysis characteristics and kinetics of common agriculture and forestry biomass were studied. Four kinds of biomass were chosen as experiment materials for thermo-gravimetric experiment. The Characteristics of biomass pyrolysis was studied by defining a new evaluation methodology. The method of Coats-Redfern was used to analyze pyrolysis kinetics of biomass pyrolysis process. The results of research show that the pyrolysis process of biomass can be divided into three stages, including drying and preheating, fast pyrolysis and slow decomposition of residue. The activation energy of pyrolysis reaction of biomass during the low temperature stage is higher than that of the high temperature stage. The values of the activation energy and pre-exponential factor are increasing with the increase of heating rate. The pyrolysis of biomass in the main pyrolysis zone can be effectively described by using the kinetic model n=2. The heating rate of 15K/min and temperature of 500°C can improve the reaction rate, and it helps to reduce energy consumption of the reaction.

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