Effect of reactant types (steam, CO 2 and steam +  CO 2 ) on the gasification performance of coal using entrained flow gasifier

2021 ◽  
Author(s):  
M. Shahabuddin ◽  
Sankar Bhattacharya
Keyword(s):  
Entrained Flow ◽  
Entrained Flow Gasifier

Dynamic modeling of Shell entrained flow gasifier in an integrated gasification combined cycle process

2014 ◽  
Vol 131 ◽  
pp. 425-440 ◽  
Author(s):  
Hyeon-Hui Lee ◽  
Jae-Chul Lee ◽  
Yong-Jin Joo ◽  
Min Oh ◽  
Chang-Ha Lee
Keyword(s):  
Dynamic Modeling ◽  
Combined Cycle ◽  
Integrated Gasification Combined Cycle ◽  
Entrained Flow ◽  
Entrained Flow Gasifier ◽  
Integrated Gasification

Thermogravimetric Analysis of Waste Gasification for an Entrained-Flow Gasifier.

2001 ◽  
Vol 27 (1) ◽  
pp. 27-33 ◽  
Author(s):  
Takatoshi Shoji ◽  
Masanori Nakamura ◽  
Hironori Ozaki
Keyword(s):  
Thermogravimetric Analysis ◽  
Entrained Flow ◽  
Entrained Flow Gasifier ◽  
Waste Gasification

Co-gasification of coal and biomass wastes in an entrained flow gasifier: Modelling, simulation and integration opportunities

2017 ◽  
Vol 37 ◽  
pp. 126-137 ◽  
Author(s):  
Dalia A. Ali ◽  
Mamdouh A. Gadalla ◽  
Omar Y. Abdelaziz ◽  
Christian P. Hulteberg ◽  
Fatma H. Ashour
Keyword(s):  
Entrained Flow ◽  
Entrained Flow Gasifier ◽  
Modelling Simulation

scholarly journals Investigation of the Coal Gasification Process Under Various Operating Conditions Inside a Two-Stage Entrained Flow Gasifier

2012 ◽  
Vol 4 (2) ◽  
Author(s):  
Armin Silaen ◽  
Ting Wang
Keyword(s):  
Coal Gasification ◽  
Operating Conditions ◽  
Coal Slurry ◽  
Two Stage ◽  
Heating Value ◽  
Fuel Distribution ◽  
Entrained Flow ◽  
One Stage ◽  
Gasification Process ◽  
Entrained Flow Gasifier

Numerical simulations of the coal gasification process inside a generic 2-stage entrained-flow gasifier fed with Indonesian coal at approximately 2000 metric ton/day are carried out. The 3D Navier–Stokes equations and eight species transport equations are solved with three heterogeneous global reactions, three homogeneous reactions, and two-step thermal cracking equation of volatiles. The chemical percolation devolatilization (CPD) model is used for the devolatilization process. This study is conducted to investigate the effects of different operation parameters on the gasification process including coal mixture (dry versus slurry), oxidant (oxygen-blown versus air-blown), and different coal distribution between two stages. In the two-stage coal-slurry feed operation, the dominant reactions are intense char combustion in the first stage and enhanced gasification reactions in the second stage. The gas temperature in the first stage for the dry-fed case is about 800 K higher than the slurry-fed case. This calls for attention of additional refractory maintenance in the dry-fed case. One-stage operation yields higher H2, CO and CH4 combined than if a two-stage operation is used, but with a lower syngas heating value. The higher heating value (HHV) of syngas for the one-stage operation is 7.68 MJ/kg, compared with 8.24 MJ/kg for two-stage operation with 75%–25% fuel distribution and 9.03 MJ/kg for two-stage operation with 50%–50% fuel distribution. Carbon conversion efficiency of the air-blown case is 77.3%, which is much lower than that of the oxygen-blown case (99.4%). The syngas heating value for the air-blown case is 4.40 MJ/kg, which is almost half of the heating value of the oxygen-blown case (8.24 MJ/kg).

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.

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