Numerical analysis on the performance of a 300 MW IGCC coal gasifier under various operating conditions

Kim, Mukyeong; Sohn, Geun; Ye, Insoo; Ryu, Changkook; Kim, Bongkeun; Lee, Jeongsu

doi:10.1016/j.fuel.2019.116063

Cited by 23 publications

(8 citation statements)

References 30 publications

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“…Since the mass fraction of volatile in fly ash was less than 10%, the devolatilization was completed quickly, and its reaction rate had little effect on the outcome. The single one-step model was able to describe this process like the literature (Bi et al 2015;Kima et al 2019). The reaction rate R v is calculated (Badzioch and Hawksley, 1970):…”

Section: Particle Reactions Modelmentioning

confidence: 99%

Numerical analysis of an 80,000 Nm3/h fly ash entrained-flow gasifier at various burner inclination angles

Niu

Zeng

et al. 2021

Environ Sci Pollut Res

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The raw syngas effluent from a fluidized bed gasifier typically contains a large amount of fly ash having a high concentration of carbon, which is undesirable. The present work examined the newly developed entrained-flow gasification technology intended to gasify raw syngas. Simulation of gas-solid flow and reaction behavior in an industrial-scale entrained-flow gasifier applying this new technology was first performed to obtain a better understanding of the particle flow and gasification characteristics. In addition, the devolatilization and heterogeneous reactions of fly ash particles were characterized by thermogravimetric analysis and user-defined function. The predictions from the simulation showed good agreement with the results of in situ experimental measurements. The combustion reaction for raw syngas occurred in the burner jet zone. As the hot gaseous products diffused, gasification reactions dominated the other zones. When burner inclination angle was 0°, 8.5°, and 25.5°, the temperature at the bottom outlet of the gasifier was lower than the ash flow temperature with the value of 1360 °C. Solid slag formed and blocked the outlet. By comparison, this gasifier with the burner inclination angle of 17° could discharge the liquid slag and function as a continuous operation. In this way, the carbon conversion in fly ash reached the maximum value of 87%.

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Section: Particle Reactions Modelmentioning

confidence: 99%

Numerical analysis of an 80,000 Nm3/h fly ash entrained-flow gasifier at various burner inclination angles

Niu

Zeng

et al. 2021

Environ Sci Pollut Res

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“…The highest concentration of CO 2 was achieved by T3-2 with a ratio of 5.57 ± 0.34 (Table ). This was followed by T3-1 which was almost half lower than T3-2 and a half higher than T2-1 . As the concentration of TBAB increases, the conversion of water to hydrate and excess CO 2 absorption is reduced.…”

Section: Results and Discussionmentioning

confidence: 92%

“…This was followed by T3-1 which was almost half lower than T3-2 and a half higher than T2-1. 37 As the concentration of TBAB increases, the conversion of water to hydrate and excess CO 2 absorption is reduced. In addition, the effect of inhibiting hydrate formation was observed.…”

Section: Results and Discussionmentioning

confidence: 99%

Sustainable Hydrates for Enhanced Carbon Dioxide Capture from an Integrated Gasification Combined Cycle in a Fixed Bed Reactor

Hassan

Sher

Fareed

et al. 2021

Ind. Eng. Chem. Res.

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An increase in temperature of up to 2 °C occurs when the amount of CO 2 reaches a range of 450 ppm. The permanent use of mineral oil is closely related to CO 2 emissions. Maintaining the sustainability of fossil fuels and eliminating and reducing CO 2 emissions is possible through carbon capture and storage (CCS) processes. One of the best ways to maintain CCS is hydrate-based gas separation. Selected type T1-5 (0.01 mol % sodium dodecyl sulphate (SDS) + 5.60 mol % tetrahydrofuran (THF), with the help of this silica gel promotion was strongly stimulated. A pressure of 36.5 bar of CO 2 is needed in H 2 O to investigate the CO 2 hydrate formation. Therefore, ethylene glycol monoethyl ether (EGME at 0.10 mol %) along with SDS (0.01 mol %) labeled as T1A-2 was used as an alternative to THF at the comparable working parameters in which CO 2 uptake of 5.45 mmol of CO 2 /g of H 2 O was obtained. Additionally, it was found that with an increase in tetra- n -butyl ammonium bromide (TBAB) supplementation of CO 2 , the hydrate and operating capacity of the process increased. When the bed height was reduced from 3 cm to 2 cm with 0.1 mol % TBAB and 0.01% SDS (labelled as T3-2) in fixed bed reactor (FBR), the outcomes demonstrated a slight expansion in gas supply to 1.54 mmol of CO 2 /g of H 2 O at working states of 283 K and 70 bar. The gas selectivity experiment by using the high-pressure volume analysis through hydrate formation was performed in which the highest CO 2 uptake for the employment of silica contacts with water in fuel gas mixture was observed in the non-IGCC conditions. Thus, two types of reactor configurations are being proposed for changing the process from batch to continuous with the employment of macroporous silica contacts with new consolidated promoters to improve the formation of CO 2 hydrate in the IGCC conditions. Later, much work should be possible on this with an assortment of promoters and specific performance parameters. It was reported in previous work that the repeatability of equilibrium moisture content and gas uptake attained for the sample prepared by the highest rates of stirring was the greatest with the CIs of ±0.34 wt % and ±0.19 mmol of CO 2 /g of H 2 O respectively. This was due to the amount of water occluded inside silica gel pores was not an issue or in other words, vigorous stirring increased the spreadability. The variation of pore size to improve the process can be considered for future work.

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“…The simulation accuracy of the coal‐gasification process depends on the use of reasonable mathematical models to describe gas‐solid flows and reactions. [ 20–27 ] In modelling the CFB gasification process, the key challenge is to accurately calculate the complicated gas‐solid drag reduction caused by a large number of particle clusters in the gas‐solid fluidization. [ 28–30 ] Various drag models have been developed to address this challenge.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of the operating characteristics of a large‐scale CFB coal‐gasification reactor with the QC‐EMMS drag model

Liu

Huo

et al. 2020

Can J Chem Eng

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The operating characteristics of a 60 m high industrial circulating fluidized bed (CFB) coal‐gasification reactor were investigated numerically based on the Eulerian‐Eulerian approach. The QC‐EMMS drag model was used to describe the gas‐solid drag reduction caused by particle clusters. The simulations predicted the overall characteristics of fluidization and gasification inside the CFB reactor riser. The simulated results are in agreement with measured data from the field test. Then, the numerical model was used to analyze the influences of the steam/coal ratio, pulverized coal‐particle size, and operating pressure. The results show that each of the three operating parameters has a great impact on different performance parameters, such as the solid mass circulation rate, the H2/CO ratio, the effective syngas yield, and the average bed temperature. The predicted data were then correlated to provide supports for optimizing the operations of large‐scale CFB coal gasifiers.

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Numerical analysis on the performance of a 300 MW IGCC coal gasifier under various operating conditions

Cited by 23 publications

References 30 publications

Numerical analysis of an 80,000 Nm3/h fly ash entrained-flow gasifier at various burner inclination angles

Numerical analysis of an 80,000 Nm3/h fly ash entrained-flow gasifier at various burner inclination angles

Sustainable Hydrates for Enhanced Carbon Dioxide Capture from an Integrated Gasification Combined Cycle in a Fixed Bed Reactor

Numerical analysis of the operating characteristics of a large‐scale CFB coal‐gasification reactor with the QC‐EMMS drag model

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Numerical analysis on the performance of a 300 MW IGCC coal gasifier under various operating conditions

Cited by 23 publications

References 30 publications

Numerical analysis of an 80,000 Nm3/h fly ash entrained-flow gasifier at various burner inclination angles

Numerical analysis of an 80,000 Nm3/h fly ash entrained-flow gasifier at various burner inclination angles

Sustainable Hydrates for Enhanced Carbon Dioxide Capture from an Integrated Gasification Combined Cycle in a Fixed Bed Reactor

Numerical analysis of the operating characteristics of a large‐scale CFB coal‐gasification reactor with the QC‐EMMS drag model

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Numerical analysis on the performance of a 300 MW IGCC coal gasifier under various operating conditions