Enhanced Yield of Hydrogen From Wastes Using High Temperature Steam Gasification

2005 ◽  
Vol 128 (3) ◽  
pp. 179-185 ◽  
Author(s):  
W. Jangsawang ◽  
A. Klimanek ◽  
Ashwani K. Gupta
Keyword(s):  
Carbon Monoxide ◽  
Fixed Bed ◽  
Calculated Data ◽  
Steam Gasification ◽  
Fixed Bed Reactor ◽  
Effect Of Temperature ◽  
Gas Composition ◽  
Wood Pellets ◽  
Feed Composition ◽  
High Yields

Equilibrium calculations using the element potential method have been used to determine optimum conditions for the gasification of wood pellets and to understand the limitations and influence of preheated gasifying agent on the product gas composition. The calculations were carried out under isobaric (1 atm) and isothermal conditions using cellulose as the waste fuel. For each isothermal case results were obtained for the effect of feed gas composition. Various mixtures of steam/cellulose [mol/mol] and oxygen/steam [mol/mol] were examined to determine conditions for high yields of H2 and CO at a given temperature. The yield of hydrogen and carbon monoxide with different input feed composition and temperature of the process are therefore considered. The results showed strong effect of temperature on hydrogen and carbon monoxide yield in the gasified product stream. High temperatures resulted in high yields of hydrogen. Pure steam resulted in higher yields of hydrogen than steam-air gasifying agent. The experimental results using a fixed bed reactor showed good trends with the calculated data. These results assist in the design and development of enhanced hydrogen production from steam gasification of wastes.

Effects of Zn on Steam Gasification Characteristics of Shenhua Lignite Char

2014 ◽  
Vol 1008-1009 ◽  
pp. 252-256
Author(s):  
Wipawan Sangsanga ◽  
Jin Xiao Dou ◽  
Zhe Lei Tong ◽  
Jiang Long Yu
Keyword(s):  
Gas Chromatography ◽  
Catalytic Activity ◽  
Fixed Bed ◽  
Steam Gasification ◽  
Experimental Results ◽  
Fixed Bed Reactor ◽  
Gas Composition ◽  
Gaseous Products ◽  
Lignite Char ◽  
Catalytic Effects

The catalytic effects of Zn on the yield of the gaseous products during steam gasification of lignite char were investigated by using a fixed-bed reactor. The gas composition was measured using a gas chromatography (GC). The experimental results show that Zn has catalytic effects on steam gasification and increased the yield of H2. There was an optimum content of Zn implanted into the coal above which zinc does not show further catalytic activity.

scholarly journals The Effect of Temperature-Pressure Conditions on the RDF Gasification in the Atmosphere of Steam and Carbon Dioxide

Energies ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7502
Author(s):  
Katarzyna Śpiewak ◽  
Grzegorz Czerski ◽  
Karol Bijak
Keyword(s):  
Carbon Dioxide ◽  
Fixed Bed ◽  
Mercury Content ◽  
Steam Gasification ◽  
Fixed Bed Reactor ◽  
Effect Of Temperature ◽  
Process Conditions ◽  
Refuse Derived Fuel ◽  
Negative Effect ◽  
Main Components

This research aimed to assess the process conditions, temperature and pressure, on the gasification of alternative refuse-derived fuel (RDF) in the atmosphere of steam and carbon dioxide on a laboratory scale using a fixed bed reactor. For this reason, the selected RDF were analysed, including proximate and ultimate analysis, mercury content and ash composition. After that, isothermal gasification measurements using the thermovolumetric method were performed under various temperatures (700, 750, 800, 900 °C) and pressures (0.5, 1, 1.5 MPa), using steam and carbon dioxide as gasifying agents. The obtained results showed that in the entire analysed range, the increase in temperature positively affect both the steam and CO2 gasification of RDF. The formation rates of main components (H2 and/or CO) of the resulting gas, as well as yields of gas components and maximum carbon conversion degrees increase. However, this positive effect was the greater, the lower the process pressure was. In turn, the effect of pressure was more complex. In the case of RDF steam gasification, an increase in pressure had a negative effect on the process, while when using carbon dioxide as a gasifying agent, an improvement of most analysed parameters was observed; however, only at low temperatures, 700–750 °C.

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

2013 ◽  
Vol 133 ◽  
pp. 127-133 ◽  
Author(s):  
Jingbo Wang ◽  
Bo Xiao ◽  
Shiming Liu ◽  
Zhiquan Hu ◽  
Piwen He ◽  
...  
Keyword(s):  
Fixed Bed ◽  
Gas Production ◽  
Steam Gasification ◽  
Fixed Bed Reactor

Steam gasification of selected energy crops in a fixed bed reactor

2010 ◽  
Vol 35 (2) ◽  
pp. 397-404 ◽  
Author(s):  
Adam Smoliński ◽  
Krzysztof Stańczyk ◽  
Natalia Howaniec
Keyword(s):  
Fixed Bed ◽  
Energy Crops ◽  
Steam Gasification ◽  
Fixed Bed Reactor

scholarly journals Conversion of Fructose to HMF in a Continuous Fixed Bed Reactor with Outstanding Selectivity

Molecules ◽  
2018 ◽  
Vol 23 (7) ◽  
pp. 1802 ◽  
Author(s):  
Eric Weingart ◽  
Sarah Tschirner ◽  
Linda Teevs ◽  
Ulf Prüße
Keyword(s):  
Large Scale ◽  
Continuous Process ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Water Addition ◽  
Batch Systems ◽  
Formation Conditions ◽  
High Yields ◽  
Optimized Conditions ◽  
By Products

5-Hydroxymethylfurfural (HMF) is a very promising component for bio-based plastics. Efficient synthesis of HMF from biomass is still challenging because of fast degradation of HMF to by-products under formation conditions. Therefore, different studies, conducted mainly in monophasic and biphasic batch systems with and without water addition have been published and are still under investigation. However, to produce HMF at a large scale, a continuous process is preferable. Until now, only a few studies have been published in this context. In this work, it is shown that fluorous alcohol hexafluoroisopropanol (HFIP) can act as superior reaction solvent for HMF synthesis from fructose in a fixed bed reactor. Very high yields of 76% HMF can be achieved in this system under optimized conditions, whilst the catalyst is very stable over several days. Such high yields are only described elsewhere with high boiling reaction solvents like dimethylsulfoxide (DMSO), whereas HFIP with a boiling point of 58 °C is very easy to separate from HMF.

scholarly journals Effect of Temperature on Plasma-Assisted Catalytic Cracking of Palm Oil into Biofuels

2020 ◽  
Vol 9 (1) ◽  
pp. 107-112 ◽  
Author(s):  
I. Istadi ◽  
Teguh Riyanto ◽  
Luqman Buchori ◽  
Didi Dwi Anggoro ◽  
Roni Ade Saputra ◽  
...  
Keyword(s):  
Palm Oil ◽  
Catalytic Cracking ◽  
Plasma Reactor ◽  
Fixed Bed ◽  
Liquid Product ◽  
Fixed Bed Reactor ◽  
Effect Of Temperature ◽  
Catalytic Reactor ◽  
Catalytic Role ◽  
Reactor Temperature

Plasma-assisted catalytic cracking is an attractive method for producing biofuels from vegetable oil. This paper studied the effect of reactor temperature on the performance of plasma-assisted catalytic cracking of palm oil into biofuels. The cracking process was conducted in a Dielectric Barrier Discharge (DBD)-type plasma reactor with the presence of spent RFCC catalyst. The reactor temperature was varied at 400, 450, and 500 ºC. The liquid fuel product was analyzed using a gas chromatography-mass spectrometry (GC-MS) to determine the compositions. Result showed that the presenceof plasma and catalytic role can enhance the reactor performance so that the selectivity of the short-chain hydrocarbon produced increases. The selectivity of gasoline, kerosene, and diesel range fuels over the plasma-catalytic reactor were 16.43%, 52.74% and 21.25%, respectively, while the selectivity of gasoline, kerosene and diesel range fuels over a conventional fixed bed reactor was 12.07%, 39.07%, and 45.11%, respectively. The increasing reactor temperature led to enhanced catalytic role of cracking reaction,particularly directing the reaction to the shorter hydrocarbon range. The reactor temperature dependence on the liquid product components distribution over the plasma-catalytic reactor was also studied. The aromatic and oxygenated compounds increased with the reactor temperature.©2020. CBIORE-IJRED. All rights reserved

Optimal Design, Modeling and Simulation of an Ethanol Steam Reforming Reactor

2009 ◽  
Vol 7 (1) ◽  
Author(s):  
Luis E Arteaga ◽  
Luis M Peralta ◽  
Yannay Casas ◽  
Daikenel Castro
Keyword(s):  
Hydrogen Production ◽  
Modeling And Simulation ◽  
Design Patterns ◽  
Plug Flow ◽  
Fixed Bed ◽  
Cell System ◽  
Fixed Bed Reactor ◽  
Effect Of Temperature ◽  
Ethanol Conversion ◽  
Renewable Hydrogen

The optimum design, modeling and simulation of a fixed bed multi-tube reformer for the renewable hydrogen production are carried out in the present paper. The analogies between plug flow model and a fixed bed reactor are used as design patterns. The steam reformer is designed to produce enough hydrogen to feed a 200kW fuel cell system (>2.19molH/s) and considering 85% of fuel utilization in the cell electrodes. The reactor prototype is optimized and then analyzed using a multiphysics and axisymmetric model, implemented on FEMLABM(R) where the differential mass balance by convection-diffusion and the energy balance for convection-conduction are solved. The temperature profile is controlled to maximize hydrogen production. The catalyst bed internal profiles and the effect of temperature on ethanol conversion and carbon monoxide production are discussed as well.

The Mo Loading Effect on SCR deNOx Performance for V-W-Mo/TiO2 Catalyst

2012 ◽  
Vol 229-231 ◽  
pp. 126-129 ◽  
Author(s):  
Yan Gao ◽  
Tao Luan ◽  
Tao Lv ◽  
Hong Ming Xu
Keyword(s):  
High Temperature ◽  
Fixed Bed ◽  
Catalytic Efficiency ◽  
Fixed Bed Reactor ◽  
Exhaust Gas ◽  
Impregnation Method ◽  
Gas Composition ◽  
Loading Effect ◽  
Tio2 Catalyst ◽  
Temperature Window

The V(1)-W(4.5)-Mo(x)/TiO2 catalysts was prepared by the incipient dry impregnation method. The catalyst samples were ground and sieved for 0.3~0.6 mm. The NO catalytic efficiency, selectivity against N2O of the catalysts were investigated on a fixed bed reactor under simulated exhaust gas with a typical gas composition. The addition of Mo enhanced the catalytic efficiency of V(1)-W(4.5)-Mo(x)/TiO2 catalysts at low temperature region, while lessened that at high temperature, especially at the temperature above 400 °C. Increasing the loading of Mo from 1.5% w/w to 4.5% w/w advanced the maximum catalytic efficiency from 78% to 99% and enlarged the temperature window of the catalyst. The acceptable NO conversion (>60%) was attained at temperature as low as 240 °C for V(1)-W(4.5)-Mo(7.5)/TiO2 catalyst. The presence of Mo promoted the N2O generation. The V(1)-W(4.5)-Mo(0)/TiO2 catalyst showed higher catalytic selectivity for NO compared to the catalysts loading Mo.

The W Loading Effect on SCR deNOx Performance for V-W-Mo/TiO2 Catalyst

2013 ◽  
Vol 774-776 ◽  
pp. 743-746 ◽  
Author(s):  
Ji Wei Peng ◽  
Tao Luan ◽  
Yan Gao
Keyword(s):  
High Temperature ◽  
Fixed Bed ◽  
Catalytic Efficiency ◽  
Fixed Bed Reactor ◽  
Exhaust Gas ◽  
Gas Composition ◽  
High Temperature Region ◽  
Loading Effect ◽  
Scr Catalysts ◽  
Temperature Window

The SCR catalysts were produced with V2O5, WO3, MoO3and anatase type TiO2. The catalyst samples were ground and sieved for 0.3~0.6mm.The NO catalytic efficiency, selectivity against N2O of the catalysts were investigated on a fixed bed reactor under simulated exhaust gas with a typical gas composition. The addition of W enhanced the catalytic efficiency of V(1)-W(x)-Mo (4.5)/TiO2catalysts at high temperature region, while lessened that at low temperature. Increasing the loading of W from 1.5% w/w to 4.5% w/w advanced the maximum catalytic efficiency from 88% to 99% and enlarged the temperature window of the catalyst. The presence of W promoted the N2O generation. The V(1)-W(4.5)-Mo (4.5)/TiO2catalyst showed higher catalytic selectivity for NO compared to the catalysts loading W.

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