Air-Steam gasification of lignite in a fixed bed gasifier: Influence of steam to lignite ratio on performance of downdraft gasifier

Synthetic gas generated from the gasification of biomass feedstocks is one of the clean and sustainable energy sources. In this work, a fixed-bed downdraft gasifier was used to perform the gasification on a lab-scale of rice husk, sawdust, and coconut shell. The aim of this work is to find and compare the synthetic gas generation characteristics and prospects of sawdust and coconut shell with rice husk. A temperature range of 650–900 °C was used to conduct gasification of these three biomass feedstocks. The feed rate of rice husk, sawdust, and coconut shell was 3–5 kg/h, while the airflow rate was 2–3 m3/h. Experimental results show that the highest generated quantity of methane (vol.%) in synthetic gas was achieved by using coconut shell than sawdust and rice husk. It also shows that hydrogen production was higher in the gasification of coconut shell than sawdust and rice husk. In addition, emission generations in coconut shell gasification are lower than rice husk although emissions of rice husk gasification are even lower than fossil fuel. Rice husk, sawdust, and coconut shell are cost-effective biomass sources in Bangladesh. Therefore, the outcomes of this paper can be used to provide clean and economic energy sources for the near future.

Download Full-text

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

Download Full-text

Hydrogen Production From Steam Gasification of Palm Kernel Shell Using Sequential Impregnation Bimetallic Catalysts

International Journal of Geology ◽

10.46300/9105.2020.14.11 ◽

2021 ◽

Vol 14 ◽

pp. 58-62

Author(s):

Anita Ramli ◽

Siti Eda Eliana Misi ◽

Mas Fatiha Mohamad ◽

Suzana Yusup

Keyword(s):

Catalytic Activity ◽

Fixed Bed ◽

Palm Kernel ◽

Steam Gasification ◽

Impregnation Method ◽

Ni Catalysts ◽

Palm Kernel Shell ◽

Calcination Temperatures ◽

Zeolite Β ◽

Metal Addition

Zeolite β supported bimetallic Fe and Ni catalysts have been prepared using sequential impregnation method and calcined at temperatures between 500-700 ºC. The catalytic activity of these catalysts in a steam gasification of palm kernel shell was tested in a fixed-bed quartz micro-reactor at 700 ºC. Both Fe and Ni active metals present in FeNi/BEA and NiFe/BEA catalysts are corresponding to Fe2O3 and NiO. Different calcination temperatures and different sequence in metal addition have a significant effect to the catalytic activity where FeNi/BEA (700) shows the highest hydrogen produced than other catalysts.

Download Full-text

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.

Download Full-text