Gasification enhancement and tar reduction using air fogging system in a double walled downdraft biomass gasifier

Sazali, S.N.; Al-attab, K.A.; Zainal, Zulkarnain

doi:10.1016/j.energy.2019.115901

Cited by 15 publications

(5 citation statements)

References 24 publications

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“…Where below the range the gasification become pyrolysis dominant while above the range it become combustion dominant. Maintaining ER in the range of 0.25-0.28 for air-steam gasification of wood sawdust pellets was shown to be essential to maintain stable self-sustaining operation without any additional external heat supply [49]. This ideal ER range was also confirmed by other researchers while increasing ER will result in considerable elevation in CO2 contamination in producer gas [74].…”

Section: Equivalence Ratiomentioning

confidence: 57%

“…The global gasification reaction shown in Eq. ( 1) can predect producer gas volume composition by knowing the elemental analysis (mass%) of biomass (C%, H%, O% and N%) [49]. Therefore, the vol.% of dry producer gas is determined as 𝐶𝑂% = (𝑑 𝑏 + 𝑑 + 𝑒 + 𝑓 + 𝑔 + ℎ ⁄ ) × 100, as an example for carbon monoxide.…”

Section: Reduction or Gasificationmentioning

confidence: 99%

“…The main parameter to evaluate the performance of the gasifier is through the cold-gasefficiency (CGE) using Eq. ( 8), where thermal biomass input is compared to the thermal output of producer gas after cooling it to ambient temeprature [49].…”

Section: Reduction or Gasificationmentioning

confidence: 99%

“…Therefore, increasing flow input is limited by the material reactivity and energy input where excessive steam flow will result in declination in gas output quality and reaction temperature. Very low S/B limit of 0.3 was observed when water was supplied into reactor jacket instead of steam and the heat from air gasification was utilized in generating the steam [49]. This can offer promising economic value as no steam boiler is needed for the system but at the expense of lower Producer gas heating value of 4.7MJ/m 3 .…”

Section: Steam-to-biomass (S/b) Ratiomentioning

confidence: 99%

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Steam Gasification of Biomass for Hydrogen Production – A Review and Outlook

Khan

Al-attab

2022

ARFMTS

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This article summarizes various biomass gasification methods and explains their advantages and disadvantages. First, theoretical aspects of gasification and the variety in reactor designs are overviewed. Despite the eminent effect of reactor design on gas product quality, gasification agents remain the dominant factor that determines the gas composition. Steam gasification is a thermochemical process that promotes organic carbonaceous substances into carbon monoxide and hydrogen while reducing the presence of dilutants. However, several obstacles during gasification and downstream processing have to be overcome to achieve adequate maturity. Gasification characteristics of steam were compared to the other gasification agents, including air, oxygen and CO2. The key performance parameters affecting steam gasification include raw material properties, additive and catalytic materials. While the key operating parameters include operating temperature, residence time, superficial velocity, equivalence ratio and steam-to-biomass ratio. Finally, the techno-economic evaluation and challenges facing the commercialization of steam gasification were discussed.

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Section: Equivalence Ratiomentioning

confidence: 57%

Section: Reduction or Gasificationmentioning

confidence: 99%

Section: Reduction or Gasificationmentioning

confidence: 99%

Section: Steam-to-biomass (S/b) Ratiomentioning

confidence: 99%

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Steam Gasification of Biomass for Hydrogen Production – A Review and Outlook

Khan

Al-attab

2022

ARFMTS

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“…The amount of N2 dilution can be controlled by the amount of air supply. On the other hand, air-steam gasification was shown to be an economically feasible approach to enhance PG quality using existing downdraft gasifiers with minor modification [21][22][23]. Several published investigations on air-steam gasification with different reactors designs and biomass types are shown in Table 1.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Production Enhancement and Tar Reduction using New Three-Layer Annular Downdraft Air-Steam Biomass Gasifier

Khan¹,

Al-attab²

2023

ARFMTS

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This study presents experimental analysis of biomass air-steam gasification for the enhancement of H2 production in producer gas (PG). Wood pellets which are widely available in Malaysia are used in this investigation. A pilot scale downdraft gasifier based on new three-layers annular reactor design was implemented to produce hydrogen enriched PG. The reactor is initially heated using hot flue gas from LPG combustion which is switched to PG when the reactor reaches stable operation. The effect of steam to biomass (S/B) ratio from 1.1 to 1.5 on PG quality in terms of gas composition, HHV and tar contamination is studied. Maximum H2 production of 27.7% was achieved at optimum air flow rate of 75 LPM and S/B ratio of 1.2. At the optimum air flow rate, HHV and tar contamination in PG where in the range of 5.06 - 6.08 MJ/Nm3 and 187 - 30mg/m3, respectively.

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