Gasification of Shenhua Bituminous Coal with CO2: Effect of Coal Particle Size on Kinetic Behavior and Ash Fusibility

Zhang, Jinzhi; Wang, Zhiqi; Zhao, Ruyan; Wu, Jinhu

doi:10.3390/en13133313

Cited by 7 publications

(5 citation statements)

References 25 publications

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“…The carbon conversion efficiency (CCE) in the reductor with ash balance obtains coal input and the char samples. The CCE (%) can be calculated using the ash balance method: CCEash = [1 − (Gash × Cash%)/(GR,coal/Ccoal%)] × 100 (11) where Cash (wt%) is the carbon content in the ash, and Ccoal (wt%) is the content of carbon of feed coal. The carbon in the slag and dissolved in the water was not considered.…”

Section: Carbon Conversion Ratementioning

confidence: 99%

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Experimental Study on Coal Gasification in a Full-Scale Two-Stage Entrained-Flow Gasifier

Wang

et al. 2020

Energies

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In this paper, coal gasification characteristics in the reductor were investigated in a full-scale two-stage pressurized entrained-flow gasifier, which has been seldom conducted previously. The present study aimed at elucidating the effects of gasifying agent concentration, coal input rate, and operation period under full reductor load on the performance of a utility two-stage pressurized entrained-flow gasifier for the first time. When the steam input in the combustor was raised from 3318 kg/h to 5722 kg/h, the total outputs of H2, CO, and CO2 were increased by 1765 Nm3/h and 2063 Nm3/h, respectively, while the CH4 output was decreased by 49 Nm3/h. The coal conversion rate was minimal at low steam input. In addition, more coal gasified in the reductor could increase the output of CH4, while CH4 could reach 1.24% with the coal input in the range of 8000–10,000 kg/h. The present work can offer a further understanding of the gasification performance in the reductor of the full-scale two-stage pressurized entrained-flow gasifier, and motivates the potential for clean utilization of coal resource.

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Section: Carbon Conversion Ratementioning

confidence: 99%

“…Coal gasification technology is a multiphase reaction technology involving both gaseous phase and solid phase reactions [8][9][10][11]. This implies complex interaction of pyrolysis, heterogeneous reactions of carbon with O 2 , CO 2 , and H 2 O, and homogeneous reactions [12].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Coal Gasification in a Full-Scale Two-Stage Entrained-Flow Gasifier

Wang

et al. 2020

Energies

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“…However, hydrogen produced from coal through coal gasification technology is considered a promising opportunity due to widely available and inexpensive coal resources (Milbrandt and Mann, 2009;Minchener, 2013). Coal gasification technology is a multiphase reaction technology that involves: pyrolysis or devolatilization, coal gasification, gas clean-up or heat recovery, water gas shift reaction, and hydrogen separation (Xu et al, 2014;Jeong et al, 2019;and Zhang et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Modelling And Simulation Of Hydrogen Production Plant for Minimum Carbon Dioxide Emission

Olanrewaju

Oboh²,

Adesina³

et al. 2023

J. Eng. Exact Sci.

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The use of coal as a source of energy for hydrogen production is desirable because it is widely available, inexpensive, and guarantees long-term availability compared to natural gas. In this study, modeling and simulation of a hydrogen production plant from coal gasification was carried out. The study also optimized process variables affecting hydrogen production for minimum carbon dioxide emissions. Modeling and simulation of a hydrogen plant was carried out using ASPEN One Suites Ver. 11 software, while optimization of process variables was done using response surface methodology (RSM). Central Composite Design (CCD) was used to design the process variables such as carbon ratio (0.715-0.75), gasification temperature (1023.15 –1223.15 K), and pressure (1-3 MPa). The independent variables for hydrogen generation and carbon dioxide emissions (CO2e-) were correlated using a quadratic model The coal gasification parameters were optimized numerically using the desirability function to maximize the hydrogen produced and minimize the CO2e-. The results reveal that gasification temperature has a greater effect on maximizing hydrogen production and carbon dioxide emission (CO2e-) reduction. Results also showed the optimal conditions for minimizing the cost and maximizing the hydrogen production: a gasification temperature of 1223.15 K, an oxygen to coal ratio of 0.715, and a gasification pressure of 1 MPa. Keywords: Hydrogen production, optimization, ASPEN, gasification, RSM, Coal Energy.

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“…The world coal proved reserves were estimated at 1070 billion tons (bt) at the end of 2019, with the global coal production reaching ca. 8 reserves-to-production ratio of 132 years among the fossil fuels [1,2]. Nowadays, coal accounts for a ca.…”

Section: Introductionmentioning

confidence: 99%

“…Gasification is an established thermochemical route for coal utilization [8][9][10][11]. By employing different gasifier configurations (i.e., up-draft, down-draft, fluidized, etc.…”

Section: Introductionmentioning

confidence: 99%

CO2 Gasification Reactivity and Syngas Production of Greek Lignite Coal and Ex-Situ Produced Chars under Non-Isothermal and Isothermal Conditions: Structure-Performance Relationships

et al. 2022

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The presented work explores the structural properties, gasification reactivity, and syngas production of Greek lignite fuel (LG) and ex-situ produced chars during CO2 gasification. Three different slow pyrolysis protocols were employed for char production involving torrefaction at 300 °C (LG300), mild-carbonization at 500 °C (LG500), and carbonization at 800 °C (LG800). Physicochemical characterization studies, including proximate and ultimate analysis, X-ray Diffraction (XRD), and Raman spectroscopy, revealed that the thermal treatment under inert atmospheres leads to chars with increased fixed carbon content and less ordered surface structures. The CO2 gasification reactivity of pristine LG and as-produced chars was examined by thermogravimetric (TG) analysis and in batch mode gasification tests under both isothermal and non-isothermal conditions. The key parameters affecting the devolatilization and gasification steps in the overall process toward CO-rich gas mixtures were thoroughly explored. The gasification performance of the examined fuels in terms of carbon conversion, instant CO production rate, and syngas generation revealed an opposite reactivity order during each stage. TG analysis demonstrated that raw lignite (LG) was more reactive during the thermal devolatilization phase at low and intermediate temperatures (da/dtmax,devol. = 0.022 min−1). By contrast, LG800 exhibited superior gasification reactivity at high temperatures (da/dtmax,gas. = 0.1 min−1). The latter is additionally corroborated by the enhanced CO formation of LG800 samples under both non-isothermal (5.2 mmol) and isothermal (28 mmol) conditions, compared to 4.1 mmol and 13.8 mmol over the LG sample, respectively. The pronounced CO2 gasification performance of LG800 was attributed to its higher fixed carbon content and disordered surface structure compared to LG, LG300, and LG500 samples.

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Gasification of Shenhua Bituminous Coal with CO2: Effect of Coal Particle Size on Kinetic Behavior and Ash Fusibility

Cited by 7 publications

References 25 publications

Experimental Study on Coal Gasification in a Full-Scale Two-Stage Entrained-Flow Gasifier

Experimental Study on Coal Gasification in a Full-Scale Two-Stage Entrained-Flow Gasifier

Modelling And Simulation Of Hydrogen Production Plant for Minimum Carbon Dioxide Emission

CO2 Gasification Reactivity and Syngas Production of Greek Lignite Coal and Ex-Situ Produced Chars under Non-Isothermal and Isothermal Conditions: Structure-Performance Relationships

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