Steam co-gasification of brown seaweed and land-based biomass

Abstract

Alkali and alkaline earth species in biomass have self-catalytic activity on the steam gasification to produce hydrogen-rich gas. In this study, three types of biomasses, i.e., brown seaweed, Japanese cedar, apple branch containing different concentrations of alkali and alkaline earth species, and the mix of both of them were gasified with steam in a fixed-bed reactor under atmospheric pressure. The effects of reaction temperature, steam amount and mixing ratio in co-gasification on gas production yields were investigated. The results showed that higher gas production yields (especially for H 2 and CO 2 ) were obtained than other two types of biomasses when the brown seaweed was used since the ash content in brown seaweed was much higher than land-based biomasses and contained a large amount of alkali and alkaline earth species. The yield of hydrogen increased with an increase in the amount of steam, but excessive steam use reduced the hydrogen production yield. From the co-gasification experiments, the gas production yields (especially for H 2 and CO 2 ) from the land-based biomasses increased with the increase in brown seaweed ratio, suggesting that the alkali and alkaline earth species in brown seaweed acted as the catalysts to enhance the gasification of land-based biomass in co-gasification process.

Design, Optimization and Energetic Efficiency of Producing Hydrogen-Rich Gas from Biomass Steam Gasification

“…A higher S/C ratio increases H2 production because of the water gas reaction (R5 and R7) and steam methanation (R8 and R9). These changes in the hydrogen yield are consistent with the results of experiments in Kaewpanha et al [32] and the thermodynamic analysis carried out Vivanpatarakij and Assabumrungrat [33]. …”

Macroalgae-Derived Biofuel: A Review of Methods of Energy Extraction from Seaweed Biomass

“…Pre-treatment of macroalgae with water and acid may be employed to remove Mg, K, Na and Ca salts and other mineral matter by up to 90% [94] which can lead to high char levels, but conversely alkaline species can catalytically aid the steam gasification of macroalgae to H2 at temperatures above 700 °C [95]. Higher syngas yields from steam gasification of macroalgae are possible due to their high content of inorganic elements than land based biomass such as Japanese Cedar and Apple branch, however the latter materials can be co-gasified with seaweed in a biorefinery, leading to enhanced syngas yields [95,96].…”

“…Higher syngas yields from steam gasification of macroalgae are possible due to their high content of inorganic elements than land based biomass such as Japanese Cedar and Apple branch, however the latter materials can be co-gasified with seaweed in a biorefinery, leading to enhanced syngas yields [95,96].…”

Promoting effect of various biomass ashes on the steam gasification of low-rank coal

“…However, different biomass contains different contents of AAEM. Biomass with high content of AAEM was found to be able to improve the gasification performance when it was co-gasified with coal [32][33][34][35][36][37] or with other biomass containing low concentration of AAEM [38]. It is found that some components of AAEM in the biomass were easily volatilized and resulting in the increase in the reactivity of the coal [36,37].…”