scholarly journals CPFD simulation on particle behaviour in an entrained-flow gasifier

Clean Energy ◽  
2020 ◽  
Vol 4 (1) ◽  
pp. 75-84
Author(s):  
Yongshi Liang ◽  
Cliff Y Guo ◽  
Xianglong Zhao ◽  
Qiang Qin ◽  
Yi Cheng ◽  
...  
Keyword(s):  
Low Temperature ◽  
Residence Time ◽  
Temperature Region ◽  
Recirculation Zone ◽  
Dynamics Simulation ◽  
Entrained Flow ◽  
Fast Reactions ◽  
Entrained Flow Gasifier ◽  
Gas Expansion ◽  
Entrained Flow Gasification

Abstract A computational particle fluid dynamics simulation model for entrained-flow gasification was established in this study. The simulation results agree with the experimental data. The detailed particle information and residence-time distribution were obtained by injecting particle tracers in the simulation. The results show that the particles in the gasifier can be classified into three flowing zones, i.e. a fast-flowing zone, a recirculation zone and a spreading zone. The criterion for this classification was also provided. The rapid gas expansion caused by the fast reactions plays a significant role in forming the particle stream into these three zones. It accelerates the particles in the centre of the gasifier while pushing the particles near the expansion edge into the gas recirculation. Also, the concentrated oxygen distribution in the gasifier results in the formation of high- and low-temperature regions. The particles in the fast-flowing zone flow directly through the high-temperature region and most of these particles in this zone were fully reacted with a short residence time. Since particles in the recirculation zone are in a relatively low-temperature region, most of these particles are not fully gasified, although with a long residence time. The rest of particles in the spreading zone show moderate properties between the above two zones.

scholarly journals Parameter analysis of an entrained flow gasification process

2018 ◽  
Vol 10 (12) ◽  
pp. 168781401881525 ◽  
Author(s):  
Hakduck Kim ◽  
Kitae Jeon ◽  
Heechang Lim ◽  
Juhun Song
Keyword(s):  
Particle Size ◽  
Residence Time ◽  
Coal Particle ◽  
Feeding Rate ◽  
Parameter Analysis ◽  
Parameter Study ◽  
Carbon Conversion ◽  
Entrained Flow ◽  
Fuel Ratio ◽  
Entrained Flow Gasification

This work presents primary results of a parameter study for entrained flow gasification using a steady-flow reactor model. The influences of important parameters such as coal types, gasifier pressure, gas/coal feeding rate, and coal particle size were studied based on coal conversion and gas product species. The prediction results were compared and validated against those published previously. In particular, a relative importance of reaction stoichiometry, temperature, reaction time (kinetics), or residence time considered in this simulation work was evaluated to affect the gas composition produced from different coals. The optimal carbon monoxide concentration was observed at an oxygen-to-fuel ratio of 0.8, while a greatest carbon conversion was found at a steam-to-fuel ratio of 0.4. Coal particle size has a strong influence on carbon conversion. However, the coal feeding rate has no effect on carbon conversion despite differences in residence time.

Modeling study of residence time of molten slag on the wall in an entrained flow gasifier

Fuel ◽  
2018 ◽  
Vol 212 ◽  
pp. 437-447 ◽  
Author(s):  
Binbin Zhang ◽  
Zhongjie Shen ◽  
Qinfeng Liang ◽  
Jianliang Xu ◽  
Haifeng Liu
Keyword(s):  
Residence Time ◽  
Molten Slag ◽  
Entrained Flow ◽  
Entrained Flow Gasifier ◽  
Modeling Study

Computational Fluid Dynamics Modeling of the Cold Condition Characteristic in an Entrained Flow Gasifier

2014 ◽  
Vol 875-877 ◽  
pp. 1225-1229
Author(s):  
Zhi Qiang Wu ◽  
Shu Zhong Wang ◽  
Lin Chen ◽  
Jun Zhao ◽  
Hai Yu Meng
Keyword(s):  
Cfd Simulation ◽  
Fluid Dynamic ◽  
Injection Velocity ◽  
Dynamics Modeling ◽  
Mixing Condition ◽  
Entrained Flow ◽  
Entrained Flow Gasifier ◽  
Cold Condition ◽  
Entrained Flow Gasification ◽  
Gasification Technology

Entrained flow gasification technology has been attracted by gasifier researchers and companies for its wide-ranging feedstock adaptability and commercial scale availability. The optimization of the entrained flow gasifier is the critical thing for the development of entrained flow gasification technology. This paper presented a three-dimensional computational fluid dynamic (CFD) simulation for a better understanding of the cold condition flow characteristic in an entrained flow gasifier. The spraying angle, diameter and injection velocity of nozzles were found to observably affect the velocity distribution and mixing condition in the entrained flow gasifier. The numerical results could provide useful information for further research on the particle track and gasification reaction and an effective process for optimizing the gasifier and nozzle.

scholarly journals Entrained Flow Gasification of Polypropylene Pyrolysis Oil

Molecules ◽  
2021 ◽  
Vol 26 (23) ◽  
pp. 7317
Author(s):  
Fredrik Weiland ◽  
Muhammad Saad Qureshi ◽  
Jonas Wennebro ◽  
Christian Lindfors ◽  
Taina Ohra-aho ◽  
...  
Keyword(s):  
Energy Content ◽  
Raw Material ◽  
Pyrolysis Oil ◽  
Process Chain ◽  
Step Process ◽  
Entrained Flow ◽  
Entrained Flow Gasifier ◽  
The Individual ◽  
Entrained Flow Gasification ◽  
Entrained Flow Gasifiers

Petrochemical products could be produced from circular feedstock, such as waste plastics. Most plants that utilize syngas in their production are today equipped with entrained flow gasifiers, as this type of gasifier generates the highest syngas quality. However, feeding of circular feedstocks to an entrained flow gasifier can be problematic. Therefore, in this work, a two-step process was studied, in which polypropylene was pre-treated by pyrolysis to produce a liquid intermediate that was easily fed to the gasifier. The products from both pyrolysis and gasification were thoroughly characterized. Moreover, the product yields from the individual steps, as well as from the entire process chain, are reported. It was estimated that the yields of CO and H2 from the two-step process were at least 0.95 and 0.06 kg per kg of polypropylene, respectively, assuming that the pyrolysis liquid and wax can be combined as feedstock to an entrained flow gasifier. On an energy basis, the energy content of CO and H2 in the produced syngas corresponded to approximately 40% of the energy content of the polypropylene raw material. This is, however, expected to be significantly improved on a larger scale where losses are proportionally smaller.

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