Optimisation of hydrogen production by steam reforming of chars derived from lumber and agricultural residues

Klaas, M.; Greenhalf, Charles; Ferrante, Luigi; Briens, Cédric; Berruti, Franco

doi:10.1016/j.ijhydene.2014.12.086

Cited by 20 publications

(16 citation statements)

References 21 publications

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“…This could be explained by the short residence time of the product gas with the increase in the steam flow rate, rendering a decrease in the time of thermal and hydrocracking reactions. Klaas et al [35] concluded that longer residence times should be applied to maximize hydrogen production by steam reforming of biomass. This is also probably the reason accounting for the fact that the content of CH 4 didn't not vary greatly since most hydrocarbons are generated in the initial stage of the gasification [36].…”

Section: Gas Compositionmentioning

confidence: 99%

Hydrogen-rich gas production by steam gasification of hydrochar derived from sewage sludge

Gai

Guo

et al. 2016

International Journal of Hydrogen Energy

152

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Steam Alkali catalyst Hydrogen Hydrothermal carbonization a b s t r a c tHydrothermal carbonization is an effective pretreatment for further thermal conversion of high moisture biomass without a high cost of a dehydration process. The current paper concerns the properties of hydrochar derived from hydrothermal carbonization of sewage sludge, and the feasibility of steam gasification of hydrochar for hydrogen-rich gas production was investigated. Sewage sludge derived hydrochar was characterized using scanning electron microscopy, Fourier transform infrared spectroscopy, and inductively coupled plasma atomic emission spectroscopy to evaluate its feasibility for gasification application. The effect of reaction temperature, steam to biomass mass ratio, and addition of alkali catalysts on steam gasification characteristics of raw sewage sludge and corresponding hydrochar were evaluated, in terms of major composition of the produced gas, gas yield, gasification efficiency and energy density. The results showed that sewage sludge derived hydrochar was rich in hydrophilic functional groups and increased Fe, Ni, alkali and alkaline earth metals (i.e. K, Na, Ca, Mg), resulting in a higher hydrogen yield and energy efficiency than direct steam gasification of sewage sludge under identical conditions. In addition, hydrogen-rich gas production was also favored with the presence of alkali catalysts, especially for the hydrochar. The present study demonstrates that hydrothermal carbonization provides an effective pretreatment of sewage sludge for production of hydrogen-rich gas via steam gasification.

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Section: Gas Compositionmentioning

confidence: 99%

Hydrogen-rich gas production by steam gasification of hydrochar derived from sewage sludge

Gai

Guo

et al. 2016

International Journal of Hydrogen Energy

152

View full text Add to dashboard Cite

show abstract

“…It is probably due to the short residence time of the product gas with the increment of steam flow rate, result in a decrease of time in reactions between the steam and hydrocarbons. Klaas et al [37] concluded that a longer residence time should be applied to maximize hydrogen production for the char steam reforming. Therefore, the optimum ratio of S/B for maximizing H 2 concentration of the pyrochar and hydrochar in this study was 1.5 and 1.0, respectively.…”

Section: Evolution Of the Product Gas Compositionmentioning

confidence: 99%

Gasification characteristics of hydrochar and pyrochar derived from sewage sludge

Gai

Chen

et al. 2016

Energy

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“…Such property makes char highly reactive towards steam gasification. Thus H 2 -rich gas can be obtained by adjusting the steam to char ratio [7], offering possibilities for a higher H 2 /CO ratio to satisfy its further utilization [8].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen-Rich Gas Production from Steam Gasification of Bio-char in the Presence of CaO

Dong

Nzihou

Chi

et al. 2016

Waste Biomass Valor

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The steam gasification of bio-char to produce hydrogen-rich gas with CaO as in-bed catalyst is experimentally investigated in a fluidized bed reactor. The purpose of the study is twofold: (1) evaluate the optimal operating conditions of catalytic gasification for hydrogenrich gas production, by examining catalyst activity and steam flowrate; (2) optimize the process by investigating the potential for reducing the gasification temperature. Results reveal that increasing the CaO/wood mass ratio from 0 to 1.0 is effective for both H 2 improvement and tar reduction; this is attributed to enhanced CO 2 absorption and reforming reactions. Increasing the steam flowrate is beneficial towards H 2 production via the water gas shift reactions. A maximum H 2 concentration is achieved at a steam flowrate of 160 g/h; however, excessive steam injection will lead to an opposite effect, due to decreased available heat. The reaction temperature should be balanced between the gasification performance and CaO carbonation ability, and the optimal temperature is found to be 700°C in this study. Comparing the results with non-catalytic high-temperature gasification, 50% CaO addition at 700°C could reach as high H 2 yield as that gasified at 800°C without catalyst. Meanwhile, the use of CaO also optimizes the gasification performance with a much higher H 2 concentration, a higher H 2 /CO ratio and reduced tar yield. Therefore, it is concluded that 50% CaO addition as catalyst at 700°C is effective to reduce the steam gasification reaction temperature by 14% (ca. 100°C). Keywords Calcium oxide Á Steam gasification of biochar Á CO 2 absorption Á Hydrogen production Á Fluidized bed

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Optimisation of hydrogen production by steam reforming of chars derived from lumber and agricultural residues

Cited by 20 publications

References 21 publications

Hydrogen-rich gas production by steam gasification of hydrochar derived from sewage sludge

Hydrogen-rich gas production by steam gasification of hydrochar derived from sewage sludge

Gasification characteristics of hydrochar and pyrochar derived from sewage sludge

Hydrogen-Rich Gas Production from Steam Gasification of Bio-char in the Presence of CaO

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