Potential applications of high-temperature air/steam-blown gasification and pyrolysis systems

Zubtsov, V. M.; Pian, C. C. P.; Yoshikawa, Kunio

doi:10.1016/j.energy.2003.10.018

Cited by 10 publications

(2 citation statements)

References 3 publications

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“…Recently, a novel concept of coal gasification has been proposed by the researchers at the Tokyo Institute of Technology, in which the high-temperature preheated gasifying agent has been used to produce low to medium BTU fuel gas without the need for oxygen. These researchers developed a system known as Multi-Stage Enthalpy Extraction Technology (MEET) and successfully employed it in several applications. − However, in the MEET system a pebble bed slagging entrained-flow gasifier was used that had to be operated at very high temperatures (1350−1550 °C), which required excessive energy input to maintain such a high gasification temperature when compared with fluidized bed gasifiers, such as spout-fluid bed gasifiers which used medium temperatures (800−1100 °C) to convert coal to fuel gas. It is expected that spout-fluid reactors using a high-temperature gasifying agent would have a more beneficial influence on the reactor's performance than those of entrained-flow gasifiers.…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Air/Steam-Blown Gasification of Coal in a Pressurized Spout-Fluid Bed

et al. 2006

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The concept of high-temperature air/steam-blown gasification technology for converting coal into lowcaloric-value gas for power generation is proposed and evaluated experimentally. Preliminary experiments are performed in a 0.1 MW thermal input pressurized spout-fluid bed gasifier. The influences of the gasifying agent preheat temperature, the gasification temperature and pressure, the equivalence ratio, the ratio of steamto-coal on gas composition, gas higher heating value, carbon conversion, and cold gas efficiency are examined. The experimental results prove the feasibility of high-temperature air/steam-blown gasification process. The gas heating value is increased by 23%, when the gasifying agent temperature is increased from 300 to 700 °C. For the operation conditions studied, the results show that gasification temperature is the most important factor influencing coal gasification in the spout-fluid bed. The gasifier performance is improved at elevated pressure mainly due to the better fluidization in the reactor. The operating parameters of the equivalence ratio and the ratio of steam-to-coal exist at optimum operating range for a certain coal gasification process.

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Section: Introductionmentioning

confidence: 99%

High-Temperature Air/Steam-Blown Gasification of Coal in a Pressurized Spout-Fluid Bed

et al. 2006

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“…Recently, in Japan, a high-temperature preheated gasifying agent has been used to produce medium syngas without the need for oxygen. − However, this system employed a pebble bed slagging entrained flow gasifier and needs to be operated at very high temperatures, which required excessive energy input or typical regenerative technology, such as high-temperature air combustion technology (HTACT), to maintain such a high gasification temperature. Therefore, it is expected that CFB gasification using a high-temperature gasifying agent would have a more beneficial influence on the performance of the reactor than the CFB gasification above.…”

Section: Introductionmentioning

confidence: 99%

Results of Bituminous Coal Gasification upon Exposure to a Pressurized Pilot-Plant Circulating Fluidized-Bed (CFB) Reactor

et al. 2010

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Pressurized turbulent circulating fluidized-bed (CFB) gasification of bituminous coal is successfully realized in a lab-scale fluidized-bed gasifier, and the effects of the stoichiometric ratio, steam/coal ratio, and preheated temperature of the gasifying agent on coal gasification characteristics are studied in this work. Experimental results prove the feasibility of a high-temperature air/steam-blown gasification process. The lower heater value is increased by 21%, when the preheated temperature of the gasifying agent is increased from 400 to 700 °C. When the stoichiometric ratio and steam/coal ratio increased, the component of syngas has a regular change according to the gasification temperature. With the increase of the stoichiometric ratio, the gasification temperature is increased, the H2 concentration increased first and then decreased, the CH4 concentration decreased, and the CO and CO2 concentrations increased first and vary little in the second stage because of the steady gasification temperature. With the increase of the steam/coal ratio, the gasification temperature shows a decrease tendency, the CH4 concentration in gas remains basically unchanged, the CO concentration decreases appreciably, and the H2 concentration first increases and then decreases, while the CO2 concentration shows the opposite trend of H2. This indicates that the gasification temperature is the most important factor influencing coal gasification. Parameters of the equivalence ratio and steam/coal ratio exist at an optimum operating range, and at this range, the coal gasification shows advantages in lower heating value, cold gas efficiency, and carbon conversion for the bituminous coal CFB gasification process. In comparison to the two other representative types of gasifications using Chinese bituminous coal, pressurized CFB gasification decreases the carbon content of fly ash much better.

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Gasification of a bituminous coal in 15MWth KEDA®circulating fluidized-bed gasifier with high-temperature preheating

Shao

Zhu

Wei

et al. 2023

Applied Thermal Engineering

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Potential applications of high-temperature air/steam-blown gasification and pyrolysis systems

Cited by 10 publications

References 3 publications

High-Temperature Air/Steam-Blown Gasification of Coal in a Pressurized Spout-Fluid Bed

High-Temperature Air/Steam-Blown Gasification of Coal in a Pressurized Spout-Fluid Bed

Results of Bituminous Coal Gasification upon Exposure to a Pressurized Pilot-Plant Circulating Fluidized-Bed (CFB) Reactor

Gasification of a bituminous coal in 15MWth KEDA®circulating fluidized-bed gasifier with high-temperature preheating

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