Air and Steam Coal Partial Gasification in an Atmospheric Fluidized Bed

Zhou, Hang; Jing, Baosheng; Zhong, Zhaoping; Huang, and Yaji; Xiao, Rui

doi:10.1021/ef0497558

Cited by 29 publications

(21 citation statements)

References 6 publications

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“…As the steam/coal ratio increases from 0.32 to 0.51, the gasification temperature decreases, while the volume fraction of combustible gas, lower calorific value, and carbon conversion increase. The volume concentration of combustible gas and lower calorific value can reach as high as 70% and 9.1 MJ/Nm 3 , , respectively, which are much higher than the results from the existing literature. (2) It can be obtained from the results of Raman and FTIR spectra that the structure of chars becomes higher ordered because of the loss of different functional groups gradually with the gasification reaction process.…”

Section: Discussionmentioning

confidence: 54%

“…The lower calorific value of gas deceases from 8.4 to 6.7 MJ/Nm 3 , which is attributed to the variation of gas composition. It is much larger than that of the air and steam coal partial gasification. , …”

Section: Resultsmentioning

confidence: 91%

“…The air and steam coal partial gasification in an atmospheric fluidized bed is studied by Zhou et al . Several factors on the gasification characteristics are studied, which show that air/steam gasification lead to a low higher heating value syngas.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Characteristics of Coal Partial Gasification on a Circulating Fluidized Bed Reactor

Wang

Luo

et al. 2017

Energy Fuels

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Experiments of coal partial gasification are conducted on a self-designed circulating fluidized bed (CFB) gasifier. The CFB gasifier system consists of a furnace, coal-feed system, air-feed system, steam generation system, gas–solid separation system, temperature- and pressure-measuring system, and material-returning system. The furnace is surrounded with electric heating wires, and the height and diameter of the furnace are 2600 and 120 mm, respectively. The experiments are conducted at temperatures between 885 and 980 °C. The coal particle size of 0.35–0.9 mm is chosen for experiments. The coal particle is gasified in the mixture of O2 and steam. The effects of different oxygen/coal ratios and steam/coal ratios on the performance of coal partial gasification are studied. As the results show, a higher oxygen/coal ratio leads to a higher gasification temperature and carbon conversion, while a slightly higher steam/coal ratio is better for the quality of syngas. The results show that the volume fraction of combustible gas and the lower calorific value reach as high as 70% and 9.1 MJ/Nm3, respectively. It can be obtained from the results of Raman and Fourier transform infrared spectra that the structure of chars becomes higher ordered as the different functional groups are gradually consumed. The chars become less reactive because higher ordered results in less reactivity.

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Section: Discussionmentioning

confidence: 54%

Section: Resultsmentioning

confidence: 91%

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Characteristics of Coal Partial Gasification on a Circulating Fluidized Bed Reactor

Wang

Luo

et al. 2017

Energy Fuels

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“…The coal partial gasification technology aims not to overpursue high carbon conversion (60–85%) in the gasification process. 19 , 20 The high-activity part of coal is gasified and converted into syngas, while the low-activity part of coal is combusted for power generation. According to our previous results, the thermal efficiency of the PGCC system is higher than that of the IGCC and shows good feasibility.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic and Economic Analysis of Oxy-Fuel-Integrated Coal Partial Gasification Combined Cycle

Ze-fu²,

Zhu³

et al. 2021

ACS Omega

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A novel partial gasification combined cycle (PGCC) system integrating coal partial gasification, oxy-fuel combustion, combined cycle, and CO 2 separation is proposed. The coal–CO 2 partial gasification technology is introduced in the coal gasification unit, and the oxy-fuel combustion technology is employed in the char combustion unit and gas turbine (GT) unit. The thermodynamic and economic analysis of the proposed system is carried out, showing that both energy and exergy efficiency have an increasing/decreasing tendency when the recycled flue gas (RFG) ratio of char combustion and GT increase. When the RFG ratios of char combustion and GT are 0.43 and 0.34, energy and exergy efficiencies reach maximum values of 48.18 and 45.11%, respectively. The energy efficiency of the PGCC-Oxy system is higher than that of the integrated gasification combined cycle (IGCC)-Oxy system by approximately 3%. It can be concluded from the economic analysis that the total investment on the PGCC-Oxy system is 3272.71 million RMB, and the internal rate of return (IRR) and payback time is 8.07% and 12.38 years, respectively.

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“…There are many scholars focusing on the researches of coal partial gasification. The experiments of coal partial gasification are conducted in atmospheric CFB . The effects of air/coal, steam/coal, bed temperature and coal rank on the fuel composition and high heating value are studied.…”

Section: Introductionmentioning

confidence: 99%

Techno‐economic analysis of novel power generation system based on coal partial gasification technology

Wang

Luo

Fang

et al. 2019

Asia-Pacific J Chem Eng

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A novel power generation system based on coal partial gasification has been proposed of which the coal feed rate is 50kg/s. It is mainly composed of oxygen‐blown CFB gasifier, CFB char combustor, heat recovery boiler and power generation unit. Coal is partly gasified with oxygen and steam to produce syngas and the syngas is sent to GT for power generation. The residue char is combusted in char combustor for power generation. Supercritical power generation technology is adopted in ST power generation unit and the parameter of the main steam is 560°C, 22.4MPa. Techno‐economic analysis of Partial Gasification Combined Cycle (PGCC) system is conducted and compared with IGCC. Law of conservation of energy and production capacity index method are adopted for thermodynamic and economic analysis, respectively. Efficiency of power generation, internal rate of return, and payback period are obtained by detailed calculation. The simulation results show that the efficiency of power generation of APGCC and PPGCC system are 49.44% and 51.37%, respectively, which are higher than that of IGCC. The fixed capital investment of PGCC is much lower than that of IGCC. The internal rate of return and payback period of APGCC 13.38% and 7.24 years, respectively which are ~9% higher and 8 years shorter than that of IGCC, respectively. This article provides a detailed analysis of PGCC which indicates that the PGCC technology has a promising prospect.

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Air and Steam Coal Partial Gasification in an Atmospheric Fluidized Bed

Cited by 29 publications

References 6 publications

Characteristics of Coal Partial Gasification on a Circulating Fluidized Bed Reactor

Characteristics of Coal Partial Gasification on a Circulating Fluidized Bed Reactor

Thermodynamic and Economic Analysis of Oxy-Fuel-Integrated Coal Partial Gasification Combined Cycle

Techno‐economic analysis of novel power generation system based on coal partial gasification technology

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