Hydrogen-rich gas production by air–steam gasification of rice husk using supported nano-NiO/γ-Al2O3 catalyst

Thermodynamic analysis of gasification with air, steam, and mixed air-steam was performed over rice husk to determine the optimum conditions (i.e., equivalence ratio (ER), steam to biomass ratio (SBR) and operating temperature) that can maximize the yield of hydrogen production with low energy consumption. It was found that for air gasification, H2 production is always less than CO production and considerably decreased with increasing ER. For steam gasification, the simulation revealed that H2 production is greater than CO, particularly at high SBR and low temperature; furthermore, H2 yield increased steadily with increasing temperature and SBR until reaching SBR of 3.5-4.0, then the effect of steam on H2 yield becomes less pronounced. As for the mixed steam/air gasification, H2 production yield increased with increasing SBR, but decreased dramatically with increasing ER (up to 0.4). Among these three operations, the highest H2 production yield can be achieved from the steam gasification with SBR of 4.0. Nevertheless, by considering the system efficiency, the combined air-steam gasification provided significant higher hydrogen production efficiency than the other two operations. The optimum condition for combined air-steam gasification can be achieved at 900°C with ER of 0.1 and SBR of 2.5, which provided the efficiency up to 66.5 percent.

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Hydrogen-Rich Gas Production from Steam Gasification of Palm Oil Wastes Using the Supported Nano-NiO/γ-Al2O3 Catalyst

2009 International Conference on Energy and Environment Technology ◽

10.1109/iceet.2009.51 ◽

2009 ◽

Cited By ~ 2

Author(s):

Jianfen Li ◽

Yanfang Yin ◽

Jianjun Liu ◽

Rong Yan

Keyword(s):

Palm Oil ◽

Gas Production ◽

Steam Gasification ◽

Al2o3 Catalyst

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Technological Solutions and Tools for Circular Bioeconomy in Low-Carbon Transition: Simulation Modeling of Rice Husks Gasification for CHP by Aspen PLUS V9 and Feasibility Study by Aspen Process Economic Analyzer

Energies ◽

10.3390/en14072006 ◽

2021 ◽

Vol 14 (7) ◽

pp. 2006

Author(s):

Diamantis Almpantis ◽

Anastasia Zabaniotou

Keyword(s):

Fluidized Bed ◽

Rice Husk ◽

Aspen Plus ◽

Economic Assessment ◽

Product Yield ◽

Steam Gasification ◽

Low Carbon ◽

Simulation Tools ◽

Fluidized Bed Gasifier ◽

Annual Earnings

This study explored the suitability of simulation tools for accurately predicting fluidized bed gasification in various scenarios without disturbing the operational system, and dedicating time to experimentation, in the aim of benefiting the decision makers and investors of the low-carbon waste-based bioenergy sector, in accelerating circular bioeconomy solutions. More specifically, this study aimed to offer a customized circular bioeconomy solution for a rice processing residue. The objectives were the simulation and economic assessment of an air atmospheric fluidized bed gasification system fueled with rice husk, for combined heat and power generation, by using the tools of Aspen Plus V9, and the Aspen Process Economic Analyzer. The simulation model was based on the Gibbs energy minimization concept. The technological configurations of the SMARt-CHP technology were used. A parametric study was conducted to understand the influence of process variables on product yield, while three different scenarios were compared: (1) air gasification; (2) steam gasification; and (3) oxygen-steam gasification-based scenario. Simulated results show good accuracy for the prediction of H2 in syngas from air gasification, but not for the other gas components, especially regarding CO and CH4 content. It seems that the RGIBBS and Gibbs free minimization concept is far from simulating the operation of a fluidized bed gasifier. The air gasification scenario for a capacity of 25.000 t/y rice husk was assessed for its economic viability. The economic assessment resulted in net annual earnings of EUR 5.1 million and a positive annual revenue of EUR 168/(t/y), an excellent pay out time (POT = 0.21) and return of investment (ROI = 2.8). The results are dependent on the choices and assumptions made.

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04/00313 Synthesis gas production from steam gasification of biomass-derived oil

Fuel and Energy Abstracts ◽

10.1016/s0140-6701(04)91515-9 ◽

2004 ◽

Vol 45 (1) ◽

pp. 37

Keyword(s):

Synthesis Gas ◽

Gas Production ◽

Steam Gasification

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Catalytic steam gasification of pig compost for hydrogen-rich gas production in a fixed bed reactor

Bioresource Technology ◽

10.1016/j.biortech.2013.01.092 ◽

2013 ◽

Vol 133 ◽

pp. 127-133 ◽

Cited By ~ 24

Author(s):

Jingbo Wang ◽

Bo Xiao ◽

Shiming Liu ◽

Zhiquan Hu ◽

Piwen He ◽

...

Keyword(s):

Fixed Bed ◽

Gas Production ◽

Steam Gasification ◽

Fixed Bed Reactor

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CFD researched on rice husk gasification in a pilot fixed bed up-draft system

Science and Technology Development Journal ◽

10.32508/stdj.v19i3.571 ◽

2016 ◽

Vol 19 (3) ◽

pp. 96-109

Author(s):

Phung Thi Kim Le ◽

Viet Tan Tran ◽

Thien Luu Minh Nguyen ◽

Viet Vuong Pham ◽

Truc Thanh Nguyen ◽

...

Keyword(s):

Mathematical Modeling ◽

Rice Husk ◽

Alternative Energy ◽

Fossil Fuels ◽

Fixed Bed ◽

Steam Gasification ◽

Actual Process ◽

Ansys Fluent ◽

Alternative Energy Sources ◽

Gasification Process

Finding alternative energy sources for fossil fuels was a global matter of concern, especially in developing countries. Rice husk, an abundant biomass in Viet Nam, was used to partially replace fossil fuels by gasification process. The study was conducted on the pilot plant fixed bed up-draft gasifier with two kind of gasification agents, pure air and air-steam mixture. Mathematical modeling and computer simulations were also used to describe and optimize the gasification processes. Mathematical modeling was based on Computational Fluid Dynamics method and simulation was carried by using Ansys Fluent software. Changes in outlet composition of syngas components (CO, CO2, CH4, H2O, H2) and temperature of process, in relation with ratio of steam in gasification agents, were presented. Obtained results indicated concentration of CH4, H2 in outlet was increased significantly when using air-steam gasification agents than pure air. The discrepancies among the gasification agents were determined to improve the actual process.

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