CO2–steam mixture for direct and indirect gasification of rice straw in a downdraft gasifier: Laboratory-scale experiments and performance prediction

Prabowo, Bayu; Umeki, Kentaro; Yan, Mi; Nakamura, Masato; Castaldi, Marco J.; Yoshikawa, Kunio

doi:10.1016/j.apenergy.2013.08.022

Cited by 88 publications

(41 citation statements)

References 26 publications

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“…Recently, gasification process has been intensively studied to produce syngas from alternative and renewable fuel such as woody biomass and agricultural residues [1][2][3][4][5]. Gasification is also considered as an effective way to utilize coal cleanly.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2014

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Section: Introductionmentioning

confidence: 99%

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

et al. 2014

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“…Some studies have compared the gasification reactivity of char with CO 2 with the gasification reactivity of char with steam [21,22]. Furthermore, some performance studies have shown that CO 2 gasification is promising for obtaining high efficiency process [23] better than gasification with air [24] or steam [24,25], as well as for decreasing the tendencies of ash slagging and fouling [26].…”

Section: Introductionmentioning

confidence: 97%

“…The previous study [25] has shown that the autothermal (direct) gasification is potentially more effective for gaining high efficiency CO 2 gasification process than the allothermal (indirect) gasification. However, most of the CO 2 gasification performance studies have been conducted with the externally heated laboratory-scale apparatus (by electrical heater) where the heat supply is relatively stable and well distributed [8,[23][24][25]27]. Only few studies have reported the performance of CO 2 gasification in the pure autothermal gasification system [28] and no study has been performed in the pilot-scale gasifier to the best of our knowledge.…”

Section: Introductionmentioning

confidence: 98%

Pilot scale autothermal gasification of coconut shell with CO2-O2 mixture

et al. 2015

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This paper explored the feasibility and benefit of CO 2 utilization as gasifying agent in the autothermal gasification process. The effects of CO 2 injection on reaction temperature and producer gas composition were examined in a pilot scale downdraft gasifier by varying the CO 2 /C ratio from 0.6 to 1.6. O 2 was injected at an equivalence ratio of approximately 0.33-0.38 for supplying heat through partial combustion. The results were also compared with those of air gasification. In general, the increase in CO 2 injection resulted in the shift of combustion zone to the downstream of the gasifier. However, compared with that of air gasification, the long and distributed high temperature zones were obtained in CO 2 -O 2 gasification with a CO 2 /C ratio of 0.6-1.2. The progress of the expected CO 2 to CO conversion can be implied from the relatively insignificant decrease in CO fraction as the CO 2 /C ratio increased. The producer gas heating value of CO 2 -O 2 gasification was consistently higher than that of air gasification. These results show the potential of CO 2 -O 2 gasification for producing high quality producer gas in an efficient manner, and the necessity for more work to deeply imply the observation.

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“…Numerous studies have been conducted on thermochemical conversion of biomass using CO2 as a carrier gas [8]. Gasification of biomass with steam and CO2 as a carrier gas produce increased amounts of CO in the product gas [9]. CO2 potentially reacts with hydrocarbons in the gas phase by a dry reforming reaction such as methane…”

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confidence: 99%

Simulation of Cotton Stalks for Syngas Generation Using CO2 and Air as Gasifying Agents

Maitlo

Mahar

Brohi

2020

Mehran Univ. res. j. eng. technol.

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Gasification of coal and biomass using CO2 and air mixture as a carrier gas offers an encouraging way to eliminate the shortage of energy and reduce carbon dioxide emissions. In the present study, the EulerianLagrangian approach was applied to understand the thermochemical conversion behavior of feedstock in entrained flow gasifier. Commercial CFD (Computational Fluid Dynamics) code ANSYS FLUENT®14 was used for the simulation purpose. It was observed that with variation in the CO2 in the air and the CO2 to cotton stalk ratio had a meaningful effect on gasification performance. The different ratios of air and CO2 in varying percentages such as 20% CO2, 30% CO2, 40% CO2, 50% CO2, 60% CO2, 70% CO2 and remaining percentages of air were introduced in entrained flow gasifier. With the increase in CO2 to cotton stalk ratio, the concentration of H2 and CO2 decreased whereas as the concentration of CO improved. It is revealed that mole fraction of CO and CH4 attained maximum when CO2% in the air was 50% and H2 mole fraction was observed maximum at a CO2% in the air was 30%. At 50% CO2 mixture in air, the maximum lower heating value and cold gas efficiency were observed. Therefore, the optimum situation might be 50% percentage CO2 in the gasifying agent for this entrained flow gasifier. Hence an increase in CO and H2, the cold gas efficiency and lower heating value reached the maximum. However, this study provides an appropriate route for energy production using cotton stalks as raw material and will help in designing and operation of the entrained flow reactor. The simulations indicate the thermodynamic limits of gasification and allow for the formulation of the general principles ruling this process. Moreover, no literature is available for the parametric investigations of Pakistani biomass gasification using entrained-flow gasifier. So this is a novel work for Pakistan and will be treated as foundation work for biomass gasification in the country.

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CO2–steam mixture for direct and indirect gasification of rice straw in a downdraft gasifier: Laboratory-scale experiments and performance prediction

Cited by 88 publications

References 26 publications

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

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

Pilot scale autothermal gasification of coconut shell with CO2-O2 mixture

Simulation of Cotton Stalks for Syngas Generation Using CO2 and Air as Gasifying Agents

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