Effect of tar decomposition on gas generation during pyrolysis in packed bed of woody biomass

Uemura Yoshimitsu, . and Suetomi Takahiro, . and Nishimura Tatsuo, . and Taniguchi Miki, . and Tanoue Ken-ichiro, . and Sasauchi Ken-ichi, . Effect of tar decomposition on gas generation during pyrolysis in packed bed of woody biomass. pp. 1-6. ISSN 2289-1692

In this report the effect of tar decomposition on gas generation during pyrolysis in a packed bed of woody biomass was studied experimentally and numerically. The setting temperature of the furnace TS was changed from 673 K to 1073 K. The diameter of the biomass particles DP was changed from 0.34 mm to 1.13 mm. The heating rate of the furnace was 400 K /hr. From the experimental results the mass flow rate of generated gas reached a maximum at a certain time t tmax for TS 773 K due to the secondary decomposition of tar. The tmax became longer as the diameter of the biomass decreased. The reasons for this finding are as follows. The thermal diffusivity of nitrogen is greater than that of biomass. The porosity in the packed bed for small particles is less than that for large particles. So the gas temperature in the bed decreased as the particles became smaller. Therefore the tmax got longer for smaller particles. The calculated gas flow rate with the effects of temperature distribution and tar decomposition during pyrolysis in the packed bed mostly agreed with the results of the experimental model. Furthermore in order to understand the chemical reactions during pyrolysis it is necessary to include not only gas phase reactions but also fluid flow in the numerical model.

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Abstract

In this report the effect of tar decomposition on gas generation during pyrolysis in a packed bed of woody biomass was studied experimentally and numerically. The setting temperature of the furnace TS was changed from 673 K to 1073 K. The diameter of the biomass particles DP was changed from 0.34 mm to 1.13 mm. The heating rate of the furnace was 400 K /hr. From the experimental results the mass flow rate of generated gas reached a maximum at a certain time t tmax for TS 773 K due to the secondary decomposition of tar. The tmax became longer as the diameter of the biomass decreased. The reasons for this finding are as follows. The thermal diffusivity of nitrogen is greater than that of biomass. The porosity in the packed bed for small particles is less than that for large particles. So the gas temperature in the bed decreased as the particles became smaller. Therefore the tmax got longer for smaller particles. The calculated gas flow rate with the effects of temperature distribution and tar decomposition during pyrolysis in the packed bed mostly agreed with the results of the experimental model. Furthermore in order to understand the chemical reactions during pyrolysis it is necessary to include not only gas phase reactions but also fluid flow in the numerical model.

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Item Type:	Article
AGROVOC Term:	Biomass
AGROVOC Term:	Pyrolysis
AGROVOC Term:	Heat transfer
AGROVOC Term:	Chemical reactions
AGROVOC Term:	Decomposition
AGROVOC Term:	Heating
AGROVOC Term:	Nitrogen
AGROVOC Term:	Models
AGROVOC Term:	Fluid flow
AGROVOC Term:	Diameter
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:28
URI:	http://webagris.upm.edu.my/id/eprint/24061

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