Hydrogen production by semicoke gasification with a supercritical water fluidized bed reactor

Cheng, Zening; Jin, Hui; Liu, Shanke; Guo, Liejin; Xu, Jialing; Su, Di

doi:10.1016/j.ijhydene.2016.06.075

Cited by 58 publications

(12 citation statements)

References 36 publications

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“…Meanwhile, the CO and CH 4 yields hardly changed with an increase in the K 2 CO 3 concentration. These results agreed with previous reports, which showed slight changes in the CO and CH 4 yields with increasing K 2 CO 3 . , , The comparison of this study with previous literature − is shown in Table .…”

Section: Resultssupporting

confidence: 93%

Catalytic Gasification of Sewage Sludge in Supercritical Water: Influence of K₂CO₃ and H₂O₂ on Hydrogen Production and Phosphorus Yield

et al. 2020

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In this work, the catalytic gasification of sewage sludge in supercritical water was investigated in a batch reactor (460 °C, 27 MPa, 6 min), and the separate and combined effects of the catalyst on the H2 production and phosphorus yield were investigated. The experimental results indicated that K2CO3 alone improved the H2 yield, gasification efficiency (GE), and carbon gasification efficiency (CE). The largest H2 yield of 54.28 mol/kg was achieved, which was approximately three times that without a catalyst. Furthermore, the inorganic phosphorus (IP) yield increased with the addition of K2CO3. However, when H2O2 was added, the H2 yield quickly decreased with increasing H2O2 coefficient, and more than 97.8% of organic phosphorus (OP) was converted into IP. The H2 yield increased with the addition of various K2CO3/H2O2 ratios, whereas the IP yield decreased.

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Section: Resultssupporting

confidence: 93%

Catalytic Gasification of Sewage Sludge in Supercritical Water: Influence of K₂CO₃ and H₂O₂ on Hydrogen Production and Phosphorus Yield

et al. 2020

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“…The study [54] is devoted to finding an effective way to use semicoke powder. This component is a finely dispersed by-product of the coal chemical industry and accounts for 10% of the total amount of semicoke.…”

Section: Influence Of External Conditions On the Characteristics Of T...mentioning

confidence: 99%

Combustion, Pyrolysis, and Gasification of Waste-Derived Fuel Slurries, Low-Grade Liquids, and High-Moisture Waste: Review

2022

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The article discusses the modern achievements in the field of thermal recovery of industrial and municipal waste. The average accumulation rate and calorific value of typical wastes were analyzed. The focus is on the opportunities to exploit the energy potential of high-moisture waste, low-grade liquid components, and fuel slurries. We consider the relevant results in the field of combustion, pyrolysis, and gasification of such fuels. The main attention is paid to synergistic effects, the influence of additives, and external conditions on the process performance. Vortex combustion chambers, boilers with burners, and nozzles for fuel injection, grate, and fluidized bed boilers can be used for the combustion of waste-derived liquid, high-moisture, and slurry fuels. The following difficulties are possible: long ignition delay, incomplete combustion, low combustion temperature and specific calorific value, high emissions (including particulate matter, polycyclic aromatic hydrocarbons), fast slagging, and difficult spraying. A successful solution to these problems is possible due to the use of auxiliary fuel; boiler modifications; oxy-fuel combustion; and the preparation of multi-component fuels, including the use of additives. An analysis of methods of waste recovery in the composition of slurries for fuel gas production showed that there are several main areas of research: pyrolysis and gasification of coal–water slurry with additives of oil waste; study of the influence of external conditions on the characteristics of final products; and the use of specialized additives and catalysts to improve the efficiency of the pyrolysis and gasification. The prospects for improving the characteristics of thermochemical conversion of such fuels are highlighted.

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“…In recent years, SCWG has achieved fruitful results at both the theoretical and experimental levels. − Extensive CFD models have been developed to investigate the properties of fluidized beds, which cost a large amount of time in the simulation. For instance, the actual computation time for the simulation of the double-circulating fluidized bed system by Su et al was about 350 h .…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Production by Coal Gasification in a Supercritical Water Fluidized Bed: Dynamic Modeling of an Industrial-Scale Reactor

2022

Ind. Eng. Chem. Res.

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This work presents two dynamic models of the supercritical water fluidized bed (SCWFB). One is a one-dimensional (1D) model that only considers the upward flow of solid and fluid phases, and the other is a 1.5-dimensional (1.5D) model that uses “core-annular” construction. The two models are compared to obtain the differences. The error in the hydrogen molar fraction reproduced by the 1.5D model is 5.48%, which is lower than that of the 1D model. The bed temperature and hydrogen yield of the 1.5D model stabilized faster and reached higher steady-state values because of the particle backmixing. The effect of coal-to-water ratios, supercritical water temperature, and boundary conditions on gasification are studied based on the 1.5D model. The results show that high water-to-coal ratio and supercritical water temperature cause high bed temperature and shorten the stabilization time. The stabilization time of the bed temperature is 20 min when the jacket water flow rate is 80 kg/min, and the stabilized bed temperature is 690.9 °C, which is similar to those at a wall temperature of 500 °C. The dynamic characteristics of the reactor are important for the design, operation, and control in an industrial-scale system for supercritical water gasification of coal.

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Hydrogen production by semicoke gasification with a supercritical water fluidized bed reactor

Cited by 58 publications

References 36 publications

Catalytic Gasification of Sewage Sludge in Supercritical Water: Influence of K₂CO₃ and H₂O₂ on Hydrogen Production and Phosphorus Yield

Catalytic Gasification of Sewage Sludge in Supercritical Water: Influence of K₂CO₃ and H₂O₂ on Hydrogen Production and Phosphorus Yield

Combustion, Pyrolysis, and Gasification of Waste-Derived Fuel Slurries, Low-Grade Liquids, and High-Moisture Waste: Review

Hydrogen Production by Coal Gasification in a Supercritical Water Fluidized Bed: Dynamic Modeling of an Industrial-Scale Reactor

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Hydrogen production by semicoke gasification with a supercritical water fluidized bed reactor

Cited by 58 publications

References 36 publications

Catalytic Gasification of Sewage Sludge in Supercritical Water: Influence of K2CO3 and H2O2 on Hydrogen Production and Phosphorus Yield

Catalytic Gasification of Sewage Sludge in Supercritical Water: Influence of K2CO3 and H2O2 on Hydrogen Production and Phosphorus Yield

Combustion, Pyrolysis, and Gasification of Waste-Derived Fuel Slurries, Low-Grade Liquids, and High-Moisture Waste: Review

Hydrogen Production by Coal Gasification in a Supercritical Water Fluidized Bed: Dynamic Modeling of an Industrial-Scale Reactor

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Catalytic Gasification of Sewage Sludge in Supercritical Water: Influence of K₂CO₃ and H₂O₂ on Hydrogen Production and Phosphorus Yield

Catalytic Gasification of Sewage Sludge in Supercritical Water: Influence of K₂CO₃ and H₂O₂ on Hydrogen Production and Phosphorus Yield