Structural Properties and Gasification Reactivity of Shenmu Fly Ash Obtained from a 5t/d Circulating Fluidized Bed Gasifier

Zhang, Haixia; Zhu, Zhengwang; Yu, Kuangshi; Lu, Qingmei

doi:10.1016/j.proeng.2015.01.233

Cited by 9 publications

(4 citation statements)

References 9 publications

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“…The H 2 -rich syngas can be widely used for clean and effective production of electricity, fuel, or other high-value-added chemicals, such as methanol, dimethyl ether, wax, etc. [39]. In this gasification process, various types of coal from the low rank to high rank [40] are usually used as feedstock, and the gasifiers [18] can be divided into three main categories, fixed bed, fluidized bed, and entrained bed gasifier [41], as schematically illustrated in Figure 1.…”

Section: Conventional Coal Gasification Technologiesmentioning

confidence: 99%

Recent Progress on Hydrogen-Rich Syngas Production from Coal Gasification

et al. 2023

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Coal gasification is recognized as the core technology of clean coal utilization that exhibits significant advantages in hydrogen-rich syngas production and CO2 emission reduction. This review briefly discusses the recent research progress on various coal gasification techniques, including conventional coal gasification (fixed bed, fluidized bed, and entrained bed gasification) and relatively new coal gasification (supercritical water gasification, plasma gasification, chemical-looping gasification, and decoupling gasification) in terms of their gasifiers, process parameters (such as coal type, temperature, pressure, gasification agents, catalysts, etc.), advantages, and challenges. The capacity and potential of hydrogen production through different coal gasification technologies are also systematically analyzed. In this regard, the decoupling gasification technology based on pyrolysis, coal char–CO2 gasification, and CO shift reaction shows remarkable features in improving comprehensive utilization of coal, low-energy capture and conversion of CO2, as well as efficient hydrogen production. As the key unit of decoupling gasification, this work also reviews recent research advances (2019–2023) in coal char–CO2 gasification, the influence of different factors such as coal type, gasification agent composition, temperature, pressure, particle size, and catalyst on the char–CO2 gasification performance are studied, and its reaction kinetics are also outlined. This review serves as guidance for further excavating the potential of gasification technology in promoting clean fuel production and mitigating greenhouse gas emissions.

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Section: Conventional Coal Gasification Technologiesmentioning

confidence: 99%

Recent Progress on Hydrogen-Rich Syngas Production from Coal Gasification

et al. 2023

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“…Basically pressure drop inside the loop-seal always increases with the increase in the riser velocity, Ulv=0.12 m/s, and Ulv=0.145 m/s. The overall pressure drop in a circulating fluidized bed system is found out and explained about experimental performance to know about pressure drop with maximum solid mass flux with some experimental conditions [49]. Figure 8 shows the pressure distribution inside riser section with different experimental condition.…”

Section: Pressure Drop Inside Risermentioning

confidence: 99%

A Brief Review on Hydrodynamic Behaviour Analysis of Coal Gasification in a Circulating Fluidized Bed Gasifier

Dwivedi¹,

Karmakar²,

Pramanick³

et al. 2019

IJHT

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In this paper a brief review on hydrodynamic characteristic of coal gasification is presented. Firstly an introduction of hydrodynamics then parameters related to hydrodynamics is discussed. In the last several decades Coal gasification is an important method to use of coal resources. The hydrodynamic characteristics have an important role to design of Circulating fluidized bed gasifiers. Circulating fluidized bed (CFB) gasifiers widely use due to their high reaction rates and high thermal efficiency. The present study includes some hydrodynamics properties of coal gasification such as effect of pressure and temperature, solid hold up, solid circulation rate, gas-solid contact, particle residency time, coal feeding rate and coal feeding position. During the brief review on hydrodynamics characteristics of coal each section of CFBs such as riser, cyclone, stand-pipe and loop seal have been considered.

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“…The higher reaction rate of ZD char at higher carbon conversion stage could be ascribed to the higher surface area of ZD char, the evolution of microstructure and reaction sites of char during gasification procedure. According to literature, the gasification reactivity of fly ashes, produced by a 240 t/d industrial CFB gasifier using Shigouyi coal as feedstock (Zhang et al 2013) or produced by a 5 t/d pilot scale CFB gasifier using Shenmu coal as feedstock (Zhang et al 2015a), is better than the raw coal chars, respectively. There are rarely little catalytic species in Shigouyi coal ash and Shenmu coal ash.…”

Section: Sample Characterizationsmentioning

confidence: 99%

Steam gasification reactivity of a high-sodium coal fly ash obtained from a pilot scale CFB gasifier

Zhang

Zhu

2018

Int J Coal Sci Technol

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Circulating fluidized bed (CFB) gasification has several advantages for the utilization of low rank coals. However, the carbon content of fly ash is usually very high, which greatly influences the gasification efficiency. The purpose of this research is to investigate the gasification reactivity of a high-sodium Zhundong (ZD) coal fly ash obtained from a pilot-scale 2.5 t/d CFB gasification system. The experiments were carried out in a thermogravimetric analyzer with steam as gasification agent, and fast pyrolyzed ZD char was also investigated as a reference sample. The results show that increasing temperature accelerates the gasification rate both for fly ash and ZD char. Fly ash has higher gasification rate at the initial gasification stage. On the contrary, ZD char has higher reaction rate even at higher carbon conversion stage. Via distributed activation energy model, the average activation energy of ZD char and fly ash is calculated to be 94.4 and 91.2 kJ/mol, respectively. The integrated model study reveals that the reaction order of ZD char is about 0.74, whereas the reaction order of fly ash decreases from 1 to 0.59 when temperature increases from 900 to 1050°C. The gasification reactivity of ZD coal fly ash is quite different with literature research on those fly ashes with rarely little catalytic elements in coal ashes. The interesting results are related with the unique properties of ZD coal fly ash and the transformation of sodium during gasification process.

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Structural Properties and Gasification Reactivity of Shenmu Fly Ash Obtained from a 5t/d Circulating Fluidized Bed Gasifier

Cited by 9 publications

References 9 publications

Recent Progress on Hydrogen-Rich Syngas Production from Coal Gasification

Recent Progress on Hydrogen-Rich Syngas Production from Coal Gasification

A Brief Review on Hydrodynamic Behaviour Analysis of Coal Gasification in a Circulating Fluidized Bed Gasifier

Steam gasification reactivity of a high-sodium coal fly ash obtained from a pilot scale CFB gasifier

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