Study on Biomass Pyrolysis Kinetics

2005 ◽  
Author(s):  
Xiaodong Zhang ◽  
Min Xu ◽  
Rongfeng Sun ◽  
Li Sun
Keyword(s):  
Model Simulation ◽  
Chemical Conversion ◽  
Main Reaction ◽  
Biomass Feedstock ◽  
Pyrolysis Process ◽  
Biomass Pyrolysis ◽  
Pyrolysis Kinetics ◽  
Pyrolysis Mechanism ◽  
Pyrolysis Characteristics ◽  
Pyrolysis Behavior

Pyrolysis is the most fundamental process in thermal chemical conversion of biomass, and pyrolysis kinetic analysis is valuable for the in-depth explore of process mechanism. On the basis of thermal gravity analysis of different kinds of biomass feedstock, thermal kinetics analysis was performed to analyze the pyrolysis behavior of biomass. With the apparent kinetic parameters derived, kinetic model was proposed for the main reaction section of biomass pyrolysis process. The pyrolysis characteristics of three kinds of biomass material were compared in view of corresponding biochemical constitution. Through model simulation of different pyrolysis process, the diversity in pyrolysis behavior of different kinds of biomass feedstock was analyzed, and pyrolysis mechanism discussed. The results derived are useful for the development and optimization of biomass thermal chemical conversion technology.

Study on Biomass Pyrolysis Kinetics

2004 ◽  
Vol 128 (3) ◽  
pp. 493-496 ◽  
Author(s):  
Xiaodong Zhang ◽  
Min Xu ◽  
Rongfeng Sun ◽  
Li Sun
Keyword(s):  
Model Simulation ◽  
Chemical Conversion ◽  
Main Reaction ◽  
Biomass Feedstock ◽  
Biomass Pyrolysis ◽  
Pyrolysis Kinetics ◽  
Pyrolysis Mechanism ◽  
Pyrolysis Characteristics ◽  
Pyrolysis Behavior ◽  
Pyrolysis Kinetic

Pyrolysis is the most fundamental process in thermal chemical conversion of biomass, and pyrolysis kinetic analysis is valuable for the in-depth exploration of process mechanisms. On the basis of thermal gravity analysis of different kinds of biomass feedstock, thermal kinetics analysis was performed to analyze the pyrolysis behavior of biomass. With the apparent kinetic parameters derived, a kinetic model was proposed for the main reaction section of biomass pyrolysis process. The pyrolysis characteristics of three kinds of biomass material were compared in view of corresponding biochemical constitution. Through model simulation of different pyrolysis processes, the diversity in pyrolysis behavior of different kinds of biomass feedstock was analyzed and pyrolysis mechanism discussed. The results derived are useful for the development and optimization of biomass thermal chemical conversion technology.

Study of Biochar Pyrolysis Mechanism and Production Technology

2014 ◽  
Vol 709 ◽  
pp. 364-369
Author(s):  
Zhi Xia Zhang ◽  
Jing Wu ◽  
Jun Meng ◽  
Wen Fu Chen
Keyword(s):  
Residence Time ◽  
Production Technology ◽  
Online Monitoring ◽  
Accuracy Control ◽  
Pyrolysis Process ◽  
Biomass Pyrolysis ◽  
Heating Value ◽  
Pyrolysis Mechanism ◽  
Combustible Gas ◽  
Carbonization Furnace

This paper describes the process of biomass pyrolysis to make biochar briefly. Studied the biochar production rate and composition and content of gas under different conditions of temperature and residence time. Meanwhile, the heating value of the combustible gas produced was analyzed. The results showed that: temperature, residence time both have different influence on the pyrolysis process Also proved that 450-500°C is not only the best temperature for biochar production,but the highest heating value of the combustible gas.It can provide the basis for the furter study of accuracy control and online monitoring of biochar production and improvement of the carbonization furnace.

scholarly journals Recent Insights into Lignocellulosic Biomass Pyrolysis: A Critical Review on Pretreatment, Characterization, and Products Upgrading

Processes ◽  
2020 ◽  
Vol 8 (7) ◽  
pp. 799 ◽  
Author(s):  
Zahra Echresh Zadeh ◽  
Ali Abdulkhani ◽  
Omar Aboelazayem ◽  
Basudeb Saha
Keyword(s):  
Lignocellulosic Biomass ◽  
Energy Resource ◽  
Value Added ◽  
Production Yield ◽  
Pyrolysis Process ◽  
Biomass Pyrolysis ◽  
Pyrolysis Mechanism ◽  
Phenol Derivatives ◽  
Bio Oil ◽  
Pretreatment Processes

Pyrolysis process has been considered to be an efficient approach for valorization of lignocellulosic biomass into bio-oil and value-added chemicals. Bio-oil refers to biomass pyrolysis liquid, which contains alkanes, aromatic compounds, phenol derivatives, and small amounts of ketone, ester, ether, amine, and alcohol. Lignocellulosic biomass is a renewable and sustainable energy resource for carbon that is readily available in the environment. This review article provides an outline of the pyrolysis process including pretreatment of biomass, pyrolysis mechanism, and process products upgrading. The pretreatment processes for biomass are reviewed including physical and chemical processes. In addition, the gaps in research and recommendations for improving the pretreatment processes are highlighted. Furthermore, the effect of feedstock characterization, operating parameters, and types of biomass on the performance of the pyrolysis process are explained. Recent progress in the identification of the mechanism of the pyrolysis process is addressed with some recommendations for future work. In addition, the article critically provides insight into process upgrading via several approaches specifically using catalytic upgrading. In spite of the current catalytic achievements of catalytic pyrolysis for providing high-quality bio-oil, the production yield has simultaneously dropped. This article explains the current drawbacks of catalytic approaches while suggesting alternative methodologies that could possibly improve the deoxygenation of bio-oil while maintaining high production yield.

Pyrolysis Characteristics and Kinetics of Walnut Shell

2015 ◽  
Vol 713-715 ◽  
pp. 2993-2996
Author(s):  
Fu Sheng Yang ◽  
Ming Zhang ◽  
Min Qun Lin ◽  
Ben Long Wei ◽  
Zhi Yuan Yang
Keyword(s):  
Diffusion Model ◽  
Walnut Shell ◽  
Relevant Parameter ◽  
Kinetics Parameters ◽  
Pyrolysis Mechanism ◽  
Pyrolysis Characteristics ◽  
Pyrolysis Behavior ◽  
Integral Methods ◽  
Kinetics Of

Pyrolysis behavior and kinetics of walnut shell were investigated using thermogravimetic analysis in this study. It was shown that kinetics parameters and model of the walnut shell pyrolysis were determined by the relevant parameter of kinetics calculated using Achar differential and the Šatava-Šesták integral methods. 3D Diffusion model (Z-L-T equation) was fitted to walnut shell pyrolysis mechanism with activated energy from 184.08 to 196.88 KJ/mol.

scholarly journals Elucidating The Thermal Decomposition Mechanism and Pyrolysis Characteristics of Biorefinery-Derived Humins From Sugarcane Bagasse And Rice Husk

2021 ◽  
Author(s):  
Julio César de Jesus Gariboti ◽  
Marina Gontijo Souza Macedo ◽  
Vinícius Matheus Silva Macedo ◽  
Yesid Javier Rueda-Ordóñez ◽  
Emília Savioli Lopes ◽  
...  
Keyword(s):  
Activation Energy ◽  
Sugarcane Bagasse ◽  
Rice Husk ◽  
Isoconversional Method ◽  
Reaction Model ◽  
Thermochemical Conversion ◽  
Thermal Decomposition Mechanism ◽  
Pyrolysis Kinetics ◽  
Pyrolysis Mechanism ◽  
Pyrolysis Characteristics

Abstract Biomass-derived humins produced in the biorefining of biomass represent an attractive feedstock for thermochemical processes and other carbon-derived platform chemicals. However, in most works, humins are merely a by-product that is not further analyzed. This work presents the purification and characterization of humins derived from sugarcane bagasse and rice husks (H-SCB and H-RH respectively), followed by the kinetic and thermodynamic analysis of its pyrolysis. Pyrolysis was examined via thermogravimetric analysis (TGA), and a global reaction model was adopted to address pyrolysis kinetics. To understand the pyrolysis process of humins and boost the quality of fit between the kinetic model and thermoanalytical data, the analyses were based on the Vyazovkin isoconversional method. The activation energy of H-SCB increased from 166.09 to 329.76 kJ mol-1. In contrast, the activation energy of H-RH decreased from 163.31 to 84.99 kJ mol-1. According to the results of the generalized master plot approach, the governing reaction mechanism shifted among order-based models, nucleation, and diffusion-controlled particle mechanisms. Derived thermodynamic properties showed that the heat absorbed helps the humins to achieve a more ordered state close to a conversion of 0.50. As far as we know, these findings are the first reported data on the forecast kinetic curves and pyrolysis mechanism of biorefinery-derived humins from sugarcane bagasse and rice husk, and these results will enable process design for the thermochemical conversion of these emerging materials to produce energy and other products.

scholarly journals Investigation of element migration characteristics and product properties during biomass pyrolysis: a case study of pine cones rich in nitrogen

RSC Advances ◽  
2021 ◽  
Vol 11 (55) ◽  
pp. 34795-34805
Author(s):  
Jielong Wu ◽  
Liangcai Wang ◽  
Huanhuan Ma ◽  
Jianbin Zhou
Keyword(s):  
Thermogravimetric Analysis ◽  
Biomass Pyrolysis ◽  
Pyrolysis Behavior ◽  
Pine Cone ◽  
Element Migration ◽  
Pine Cones

To further understand the element migration characteristics and product properties during biomass pyrolysis, herein, pine cone (PC) cellulose and PC lignin were prepared, and their pyrolysis behavior was determined using thermogravimetric analysis (TGA).

Co-Pyrolysis Characteristics and Product Distributions of Coal Tailings and Biomass Blends

2014 ◽  
Vol 878 ◽  
pp. 177-184
Author(s):  
He Long Hui ◽  
Jin Wei Jia ◽  
Yun Zhao Wei ◽  
Shu Cheng Liu ◽  
Xing Min Fu ◽  
...  
Keyword(s):  
Synergetic Effect ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Shanxi Province ◽  
Pyrolysis Process ◽  
Pyrolysis Characteristics ◽  
Product Distributions ◽  
Significant Difference ◽  
Coal Tailings ◽  
Quality Production

In order to make better utilization of coal tailings (low quality production after coal preparation) as the resources, the pyrolysis characteristics and product distributions during co-pyrolysis of coal tailings together with biomass at different ratio (20%, 40%, 60% and 80%) were determined in thermogravimetric analysis (TGA) and a fixed bed reactor in this paper. Coal tailings (TC) selected was provided by Hexi coal in Shanxi province, and pine branch wastes (PBW) were used as biomass samples. The result of TGA experiments indicates that the temperature corresponding to the maximum pyrolysis rate exhibited a significant difference between TC and PBW, and the value of the calculated TGA and DTG curves is similar to the experimental ones. In a fixed bed experiments within a temperature range of 25-900°C, gas product yields of co-pyrolysis of TC and PBW are higher than those of the sum of them individually, while tar and char yields were on the contrary. It shows some synergetic effect exists during co-pyrolysis process of TC and PBW blends, and the maximum synergy exhibits with a PBW blending ratio of 40%. CO yield increases up to 30% at 400°C and CH4yield increases up to 11.33% at 700°C compared with the calculated value. These findings can potentially help to understand and predict the behavior of coal tailings/biomass blends in practical systems.

Numerical study of the biomass pyrolysis process in a spouted bed reactor through computational fluid dynamics

Energy ◽  
2021 ◽  
Vol 214 ◽  
pp. 118839
Author(s):  
Shiliang Yang ◽  
Ruihan Dong ◽  
Yanxiang Du ◽  
Shuai Wang ◽  
Hua Wang
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Numerical Study ◽  
Pyrolysis Process ◽  
Biomass Pyrolysis ◽  
Spouted Bed

Influence of Metal Ions on Biomass Pyrolysis Process

2013 ◽  
Vol 278-280 ◽  
pp. 440-443
Author(s):  
Rui Rui Xiao ◽  
Wei Yang ◽  
Guang Suo Yu
Keyword(s):  
Metal Ions ◽  
Fixed Bed ◽  
Earth Metal ◽  
Gas Production ◽  
Fixed Bed Reactor ◽  
Recombination Reaction ◽  
Pyrolysis Process ◽  
Biomass Pyrolysis ◽  
Large Molecular Weight ◽  
Alkaline Earth Metal Ions

In order to understand the behavior of biomass pyrolysis, a series of pretreatment biomass were prepared with acid-washing and metal impregnated methods. The effects of metal ions on the yields of tar, char and gas from straw pyrolysis were analyzed in our lab scale fixed-bed reactor. Alkali metal and alkaline earth metal ions affect biomass pyrolysis process and the products heavily. The decreasing metal ions result in declining yield of semi-char and increasing yields of tar and gas. Meanwhile, the pyrolysis temperature corresponding maxium yield of tar increases. There exist marked catalytic effect of potassium, calcium and magnesium cations on the cracking of large molecular weight parts of tar and semi-char formation via recombination reaction of tar. As cause a higher production of char while a decrease of tar and gas production.

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