Mechanistic insights into effect of feeding rate on soot formation during rapid pyrolysis of biomass model components in a drop-tube furnace at high temperature

2020 ◽  
Author(s):  
Changya Deng ◽  
Hongwei Wu
Keyword(s):  
High Temperature ◽  
Feeding Rate ◽  
Soot Formation ◽  
Tube Furnace ◽  
Drop Tube ◽  
Drop Tube Furnace ◽  
Model Components ◽  
Pyrolysis Of Biomass ◽  
Rapid Pyrolysis ◽  
Effect Of Feeding

High-temperature pyrolysis behavior of two different rank coals in fixed-bed and drop tube furnace reactors

2020 ◽  
Vol 93 (6) ◽  
pp. 2271-2279
Author(s):  
Kang Zhang ◽  
Peng Lu ◽  
Xutao Guo ◽  
Lijian Wang ◽  
Hongkun Lv ◽  
...  
Keyword(s):  
High Temperature ◽  
Fixed Bed ◽  
Tube Furnace ◽  
Drop Tube ◽  
Drop Tube Furnace ◽  
Pyrolysis Behavior

scholarly journals Thermodynamic evaluation for reduction of iron oxide ore particles in a high temperature drop tube furnace

2018 ◽  
Vol 47 (2) ◽  
pp. 173-177 ◽  
Author(s):  
Zhiyuan Chen ◽  
Yingxia Qu ◽  
Christiaan Zeilstra ◽  
Jan van der Stel ◽  
Jilt Sietsma ◽  
...  
Keyword(s):  
High Temperature ◽  
Iron Oxide ◽  
Temperature Drop ◽  
Tube Furnace ◽  
Thermodynamic Evaluation ◽  
Drop Tube ◽  
Drop Tube Furnace ◽  
Reduction Of Iron

Theoretical and Experimental Investigation of Micro Feeding Technology on a Drop Tube Furnace

2012 ◽  
Vol 516-517 ◽  
pp. 476-482
Author(s):  
Zheng Zhong Ma ◽  
Xiang Xu ◽  
Yun Han Xiao
Keyword(s):  
Particle Size ◽  
Flow Rate ◽  
Feeding Rate ◽  
Tube Furnace ◽  
Low Flow ◽  
Drop Tube ◽  
Interparticle Forces ◽  
Drop Tube Furnace ◽  
Coal Particles ◽  
Low Flow Rate

Coal particles are supplied to drop tube furnace (DTF) with a designed shaftless screw micro feeder. The condition of individual particles in furnace, which demands small particles size (102μm) and low flow rate for micro feeder，is desired to reaction mechanisms research. When particle size is less than 1mm, the interparticle forces such as van der Waals interactions have enormous effect on flow behavior of particles, so it is difficult to provide continuous and steady particles flow at low flow rate. In this paper, the micro feeder uses shaftless spring as its feeding element. To simulate dispersed particles flow, the feeding rate of coal particles should be decided by feeding coefficient M and is controlled by variable rotation speed of screw. The corresponding simplified model of feeding rate is presented, and interparticle forces are evaluated by the velocity coefficient . A vibrating metal rod is inserted into the middle of the shaftless screw to avoid particles agglomeration, and particle flow stability is also effectively improved. The given results show good linearity and stability of micro feeder. Moreover, the influences of the particle properties such as particle size and particle moisture content on the feeding rate are also investigated.

Tar destruction and coke formation during rapid pyrolysis and gasification of biomass in a drop-tube furnace

Fuel ◽  
2010 ◽  
Vol 89 (2) ◽  
pp. 302-309 ◽  
Author(s):  
Yan Zhang ◽  
Shiro Kajitani ◽  
Masami Ashizawa ◽  
Yuso Oki
Keyword(s):  
Coke Formation ◽  
Tube Furnace ◽  
Drop Tube ◽  
Drop Tube Furnace ◽  
Rapid Pyrolysis

scholarly journals Effects of High Temperature in the Combustion Chamber of a Drop Tube Furnace (DTF) for Different Thermochemical Processes

2019 ◽  
pp. 1-10
Author(s):  
Glauber Cruz ◽  
Paula Manoel Crnkovic
Keyword(s):  
High Temperature ◽  
Combustion Chamber ◽  
Reaction Rates ◽  
Tube Furnace ◽  
Process Conditions ◽  
Thermal Processes ◽  
Drop Tube ◽  
Drop Tube Furnace ◽  
Operation Conditions ◽  
Thermochemical Processes

Introduction: Thermochemical and biochemical processes are used to convert biomass into useful and sustainable energy. Thermoconversion processes comprises the biomasses burning in an oxygen-rich environment or in the absence of this, where types and fuel properties, process conditions, particles size, air flow rate and fuel moisture affect directly the combustion characteristics, altering the generation and heat transfer and the reaction rates. The combustion chamber temperature is an important factor for the biomasses combustion or other material, because this exerts large influence in the thermal processes efficiency, products yield and composition of the generated products. Research Problem: For this reason, this paper aims to investigate the high temperature behavior in the combustion chamber of a Drop Tube Furnace (DTF) Methods: Different thermochemical processes (conventional combustion, pyrolysis and two typical oxy-fuel combustion atmospheres) and five Brazilian biomasses (pine sawdust, sugarcane bagasse, coffee and rice husks, and tucumã seed) are employed. Such monitoring in situ was performed using two thermocouples located inside the furnace: one in the upper and other in bottom part. Results: For the different biomasses and thermal processes (atmospheres), a trend in the high temperature variations of the combustion chamber and residence times were observed, which can be related to the biomasses feeding system, moisture of samples and specific furnace operation conditions. Conclusion: This study can support in new projects elaboration of thermochemical conversion systems in lab-scale or industrial for the burning of several biomasses or other materials with purpose bioenergy generation.

scholarly journals Reduction Kinetics of Fine Hematite Ore Particles with a High Temperature Drop Tube Furnace

2015 ◽  
Vol 55 (5) ◽  
pp. 952-960 ◽  
Author(s):  
Yingxia Qu ◽  
Yongxiang Yang ◽  
Zongshu Zou ◽  
Christiaan Zeilstra ◽  
Koen Meijer ◽  
...  
Keyword(s):  
High Temperature ◽  
Temperature Drop ◽  
Tube Furnace ◽  
Reduction Kinetics ◽  
Drop Tube ◽  
Drop Tube Furnace ◽  
Hematite Ore ◽  
Kinetics Of
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