scholarly journals Synergistic Effect on the Non-Oxygenated Fraction of Bio-Oil in Thermal Co-Pyrolysis of Biomass and Polypropylene at Low Heating Rate

Processes ◽  
2020 ◽  
Vol 8 (1) ◽  
pp. 57
Author(s):  
Dijan Supramono ◽  
Adithya Fernando Sitorus ◽  
Mohammad Nasikin
Keyword(s):  
Heat Transfer ◽  
Synergistic Effect ◽  
Heating Rate ◽  
Stirred Tank ◽  
Biomass Pyrolysis ◽  
Feed Composition ◽  
Tank Reactor ◽  
Bio Oil ◽  
Biomass Particles ◽  
Mass Ejection

Biomass pyrolysis and polypropylene (PP) pyrolysis in a stirred tank reactor exhibited different heat transfer phenomena whereby heat transfer in biomass pyrolysis was driven predominantly by heat radiation and PP pyrolysis by heat convection. Therefore, co-pyrolysis could exhibit be expected to display various heat transfer phenomena depending on the feed composition. The objective of the present work was to determine how heat transfer, which was affected by feed composition, affected the yield and composition of the non-polar fraction. Analysis of heat transfer phenomena was based on the existence of two regimes in the previous research in which in regime 1 (the range of PP composition in the feeds is 0–40%), mass ejection from biomass particles occurred without biomass particle swelling, while in regime 2 (the range of PP composition in the feeds is 40–100%), mass ejection was preceded by biomass particle swelling. The co-pyrolysis was carried out in a stirred tank reactor with heating rate of 5 °C/min until 500 °C and using N2 gas as carrier gas. Temperature measurement was applied to pyrolysis fluid at the lower part of the reactor and small biomass spheres of 6 mm diameter to simulate heat transfer to biomass particles. The results indicate that in regime 1 convective and radiative heat transfers sparingly occurred and synergistic effect on the yield of non-oxygenated phase increased with increasing convective heat transfer at increasing %PP in feed. On the other hand, in regime 2, convective heat transfer was predominant with decreasing synergistic effect at increasing %PP in feed. The optimum PP composition in feed to reach maximum synergistic effect was 50%. Non-oxygenated phase portion in the reactor leading to the wax formation acted as donor of methyl and hydrogen radicals in the removal of oxygen to improve synergistic effect. Non-oxygenated fraction of bio-oil contained mostly methyl comprising about 53% by mole fraction, while commercial diesel contained mostly methylene comprising about 59% by mole fraction

scholarly journals Effects of heating rate and heating up time to central biomass particles for bio-oil production

2016 ◽  
Vol 51 (1) ◽  
pp. 13-22
Author(s):  
MB Ahmed ◽  
ATMK Hasan ◽  
M Mohiuddin ◽  
M Asadullah ◽  
MS Rahman ◽  
...  
Keyword(s):  
Heating Rate ◽  
Particle Temperature ◽  
Product Distribution ◽  
Heating Rates ◽  
Final Temperature ◽  
Central Mass ◽  
Bio Oil ◽  
Reactor Temperature ◽  
Biomass Particles ◽  
Heating Up

Objective of this work was to pyrolysis woody biomass. Experiments were carried out at 300 to 500oC. Relatively bigger particles were used. Special emphasis was given to investigate the effects of heating rate and heating up time of the central mass of the particles on the product distribution. Surface temperature reached to the reactor set temperature immediately while the temperature at the central part was as low as 50oC. The center temperature gradually increased to the final temperature within 3 to 8 minutes, depending on the wood types and the reactor set temperature. For ipil-ipil wood the heating rate of the central mass was much faster than krishnachura and koroi woods, and thus the heating up time was lower. Ipil-ipil wood was experienced higher yield (65%) even at lower reactor temperature 300oC with particle temperature 450oC. In the case of krishnachura and koroi woods, the bio-oil yields were lower under the same condition due to the heating rates of the central parts were much slower. Further researchon different biomasses may be necessary to demonstrate overall process.Bangladesh J. Sci. Ind. Res. 51(1), 13-22, 2016

Improving Bio-oil Quality through Co-Pyrolysis of Corn Cobs and Polypropylene in a Stirred Tank Reactor

2016 ◽  
Vol 7 (8) ◽  
pp. 1381 ◽  
Author(s):  
Dijan Supramono ◽  
Jonathan Jonathan ◽  
Haqqyana Haqqyana ◽  
Setiadi Setiadi ◽  
Mohammad Nasikin
Keyword(s):  
Oil Quality ◽  
Stirred Tank ◽  
Stirred Tank Reactor ◽  
Tank Reactor ◽  
Corn Cobs ◽  
Bio Oil

Experimental and Numerical Investigation of Biomass Pyrolysis Process Focusing on Intra-Particle Heat Transfer

2010 ◽  
Author(s):  
Hirotatsu Watanabe ◽  
Yosuke Morinaga ◽  
Takuya Okada ◽  
Ken Okazaki
Keyword(s):  
Heat Transfer ◽  
Heat Capacity ◽  
Temperature Gradient ◽  
Heating Rate ◽  
Particle Temperature ◽  
High Heating Rate ◽  
Pyrolysis Process ◽  
Biomass Pyrolysis ◽  
High Heating ◽  
Calculation Results

The purpose of this research was to investigate biomass pyrolysis process focusing on intra-particle heat transfer. Thermal decomposition characteristics of wood cylinder with a diameter of 8mm were studied experimentally and numerically. In an experiment, a thermobalance reactor was used to investigate weight loss of wood cylinder during the pyrolysis. Three K-type thermocouples with a diameter of 0.5 mm were placed in the sample to measure the intra-particle temperature. Wood cylinders were heated by infrared furnace under inert gas at 1 Ks−1 and 30 Ks−1. In a calculation, unsteady two-dimensional heat and mass transfer equations were discretized by using Finite Volume Method with first order implicit scheme. The reaction kinetics of biomass pyrolysis were modeled by using a multi-step kinetic scheme. To investigate the effect of intra-particle heat transfer, calculations with considering temperature gradient and with uniform temperature were carried out. As a result, the calculation results with considering intra-particle heat transfer were in good agreement with experimental ones, while calculation results without considering temperature gradient were quite different from experimental ones at high heating rate. Intra-particle heat transfer mechanism at low heating rate was quite different from that at high heating rate. Both numerical and experimental results showed that there was a distinct peak of intra-particle temperature due to strong exothermic reaction at low heating rate. Meanwhile, endothermic reactions were dominant at high heating rate, and there was no temperature peak. Moreover, an increase in the slope of temperature history observed at high heating rate. It was difficult to explain the slope increase by only weak exothermic reactions. This was because that heat capacity was decreased significantly during pyrolysis. When the heating rate was high, the yield of volatile matter whose heat capacity was quite less than that of char or wood was increased. It was shown that volatile and char formation characteristics were strongly related with intra-particle heat transfer characteristics.

The continuous self stirred tank reactor: measurement of the cracking kinetics of biomass pyrolysis vapours

2005 ◽  
Vol 60 (1) ◽  
pp. 41-55 ◽  
Author(s):  
Sébastien Baumlin ◽  
François Broust ◽  
Monique Ferrer ◽  
Nicolas Meunier ◽  
Eric Marty ◽  
...  
Keyword(s):  
Stirred Tank ◽  
Biomass Pyrolysis ◽  
Stirred Tank Reactor ◽  
Tank Reactor ◽  
Kinetics Of

scholarly journals Study on Heat Transfer in Scale-up of Stirred Tank Reactor Using Maxblend Impeller for Continuous Bulk Polymerization.

1996 ◽  
Vol 22 (3) ◽  
pp. 480-487
Author(s):  
Yoshio Fuchigami ◽  
Toshiaki Inami ◽  
Yosokichi Kobayashi ◽  
Akira Hashimoto
Keyword(s):  
Heat Transfer ◽  
Scale Up ◽  
Bulk Polymerization ◽  
Stirred Tank ◽  
Stirred Tank Reactor ◽  
Tank Reactor

A Robust Extended State Observer for the Estimation of Concentration and Kinetics in a CSTR

2016 ◽  
Vol 14 (1) ◽  
pp. 481-490 ◽  
Author(s):  
Juan Diego Sánchez Torres ◽  
Héctor A. Botero ◽  
Esteban Jiménez ◽  
Oscar Jaramillo ◽  
Alexander G. Loukianov
Keyword(s):  
Heat Transfer ◽  
Activation Energy ◽  
State Estimation ◽  
Sliding Mode ◽  
Stirred Tank ◽  
Continuous Stirred Tank Reactor ◽  
Extended State ◽  
Tank Reactor ◽  
Estimation Scheme ◽  
Continuous Stirred Tank

AbstractThis paper presents a state estimation structure for a Continuous Stirred Tank Reactor (CSTR), by means of an Asymptotic Observer jointly with a disturbance high order sliding mode-based estimator. The proposed estimation scheme allows the asymptotic reconstruction of the concentration inside the reactor based on the measures of the temperature inside the reactor and the temperature inside the jacket, in presence of changes in the global coefficient of heat transfer $UA$, the Arrhenius constant ${k_0}$ and the activation energy E. Additionally, the structure is able to estimate $UA$ and the kinetics term ${k_0}{e^{- {E \over {RT}}}}$. The properties of the proposed scheme are proved mathematically and verified through numerical simulations.

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