Coal Type, Temperature and Gasifiying Agent Effects on Low-Rank Coal Gasification Using CFD Method

Low-Rank Coal (LRC) gasification utilising Fluidised Bed Gasifier (FBG) is more efficient for LRC that has higher reactivity, moisture, tar, volatile, and ash content but lower calorific value compared to other types of coals. This work investigated the application of Computational Fluid Dynamics (CFD) in simulating LRC gasification under different temperatures which is lower (873K), normal (973K) and higher (1073K) temperature atmosphere. Besides that, the effect of LRC type and gasifying agents on the producer gas CO+H2 composition, Lower Heating Value (LHV) and Cold Gas Efficiency (CGE) were also studied using High-rank Coal (HRC) as comparison. The results obtained showed that LRC gasification using oxygen increased LHV and CGE. Lower temperature gasification using oxygen at 873 increased CO+H2, LHV and CGE for LRC compared to higher temperatures at 973K and 1073K. This prediction suggests that LRC gasification using oxygen at lower temperature increases the LRC gasification efficiency.

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Gasifying agents type at lower temperature effect on bubbling fluidised bed gasification for low rank coal

Progress in Computational Fluid Dynamics An International Journal ◽

10.1504/pcfd.2019.10018822 ◽

2019 ◽

Vol 19 (1) ◽

pp. 44

Author(s):

Kahar Osman ◽

Nik Rosli Abdullah ◽

Nor Fadzilah Othman ◽

Mohd Norhakem Hamid ◽

Kamariah Md Isa

Keyword(s):

Temperature Effect ◽

Low Rank ◽

Fluidised Bed ◽

Low Rank Coal ◽

Lower Temperature

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Gasifying agents type at lower temperature effect on bubbling fluidised bed gasification for low rank coal

Progress in Computational Fluid Dynamics An International Journal ◽

10.1504/pcfd.2019.097598 ◽

2019 ◽

Vol 19 (1) ◽

pp. 44 ◽

Cited By ~ 1

Author(s):

Kamariah Md Isa ◽

Kahar Osman ◽

Nik Rosli Abdullah ◽

Nor Fadzilah Othman ◽

Mohd Norhakem Hamid

Keyword(s):

Temperature Effect ◽

Low Rank ◽

Fluidised Bed ◽

Low Rank Coal ◽

Lower Temperature

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Catalytic effects of ash components in low rank coal gasification

Fuel ◽

10.1016/0016-2361(90)90086-6 ◽

1990 ◽

Vol 69 (3) ◽

pp. 275-281 ◽

Cited By ~ 20

Author(s):

Ralf Köpsel ◽

Henryk Zabawski

Keyword(s):

Coal Gasification ◽

Low Rank ◽

Low Rank Coal ◽

Catalytic Effects

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Indian Sub-bituminous and Low-Rank Coal Gasification Experiments in a Circulating Fluidized Bed Gasifier Under Air Atmosphere

Advances in Mechanical Engineering - Lecture Notes in Mechanical Engineering ◽

10.1007/978-981-15-0124-1_70 ◽

2020 ◽

pp. 777-784 ◽

Cited By ~ 1

Author(s):

Krishna Kant Dwivedi ◽

Prabhansu ◽

A. K. Pramanick ◽

M. K. Karmakar ◽

P. K. Chatterjee

Keyword(s):

Fluidized Bed ◽

Coal Gasification ◽

Circulating Fluidized Bed ◽

Low Rank ◽

Low Rank Coal ◽

Air Atmosphere ◽

Fluidized Bed Gasifier

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Effect of Swirl on Gasification Characteristics in an Entrained-flow Coal Gasifier

International Journal of Chemical Reactor Engineering ◽

10.1515/ijcre-2019-0203 ◽

2020 ◽

Vol 18 (3) ◽

Author(s):

Rongbin Li ◽

Mingzhuang Xie ◽

Hui Jin ◽

Liejin Guo ◽

Fengqin Liu

Keyword(s):

Coal Gasification ◽

Three Dimensional ◽

Reaction Model ◽

Gas Temperature ◽

Swirl Number ◽

Entrained Flow ◽

Gasification Process ◽

Cold Gas Efficiency ◽

Product Composition ◽

Gas Efficiency

AbstractThe three-dimensional (3-D) comprehensive mathematical model was developed to simulate the coal gasification process in an entrained flow gasifier with a swirl burner. The models employed or developed includes the coal devolatilization model, the char combustion and gasification model, the gas homogeneous reaction model, the random-trajectory model, gas turbulence model, and the P-1 radiation model. The solution of models was executed based on the computational fluid dynamics (CFD). By qualitatively comparing the results at different swirl number, the significant influences of swirl on characteristics of coal gasification such as flow distributions, gas temperature and product composition including hydrogen (H2), carbon monoxide (CO), etc., and on the performance of coal gasification such as averaged exit product composition, carbon conversion rate and cold gas efficiency, were in detail discussed. Especially, a proper swirl number (S ≤ 0.65) in favor of gasification was found for the investigated gasifier in this paper.

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The optimization of low-rank coal grinding for transport coal gasification by robust design

Fuel ◽

10.1016/j.fuel.2011.09.031 ◽

2012 ◽

Vol 95 ◽

pp. 282-286 ◽

Cited By ~ 11

Author(s):

Chong-Lyuck Park ◽

Byoung-Gon Kim

Keyword(s):

Robust Design ◽

Coal Gasification ◽

Low Rank ◽

Low Rank Coal

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Characteristics of low-rank and medium-rank Indonesian coal using the TG-DSC method

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/882/1/012031 ◽

2021 ◽

Vol 882 (1) ◽

pp. 012031

Author(s):

Hariana ◽

A Prismantoko ◽

H P Putra ◽

A P Nuryadi ◽

Sugiarto ◽

...

Keyword(s):

Moisture Content ◽

Power Plants ◽

Decisive Role ◽

Volatile Matter ◽

Low Rank ◽

Low Rank Coal ◽

Heating Value ◽

Burning Coal ◽

Indonesian Coal ◽

Lower Temperature

Abstract Low-rank and medium-rank coal are dominant coal resources in Indonesia. Considering the decisive role of coal in coal-fired power plants, it is crucial to examine the combustion characteristics before burning coal in the boiler. This paper presents the effect of moisture content, heating value, and volatile matter on ignition temperature and burn out of five samples of low-rank coal and five samples of medium-rank coal using TG-DSC analysis which was carried out using LINSEIS High-Pressure STA at atmospheric pressure with an air rate of 25 ml/min and heating rate of 10 °C/min. The investigation results show that low-rank coal with the higher volatile matter has tremendous reactivity and is more flammable, and favours of burning through itself than medium-rank coal. Medium-rank coal has better combustion with short residence time because it has a lower burnout temperature (Tbo) value than low-rank coal. However, medium-rank coal burns more instantly because it has a lower temperature interval than low-rank coal. Medium-rank coal, which has fixed carbon and higher heating value, but lower moisture content, has a higher Rmax value than low-rank coal. In conjunction with these properties, it is crucial to examine the implementation in boilers.

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A Novel Coal Gasification System Through Thermochemical Regenerative Process of Syngas Sensible Heat to Enhance Cold Gas Efficiency

ASME 2017 11th International Conference on Energy Sustainability ◽

10.1115/es2017-3167 ◽

2017 ◽

Author(s):

Dandan Wang ◽

Sheng Li ◽

Lin Gao

Keyword(s):

Energy Level ◽

Coal Gasification ◽

The Novel ◽

Sensible Heat ◽

Exergy Destruction ◽

Gasification Process ◽

Cold Gas Efficiency ◽

Gas Efficiency ◽

Gasification Technology ◽

Cold Gas

In this paper, a novel coal gasification technology used for Integrated Gasification Combined Cycle (IGCC) power plants is proposed, in which a regenerative unit is applied to recover syngas sensible heat to generate steam and then the high temperature steam is used to gasify coke from pyrolyzer. Through such a thermochemical regenerative unit, the sensible heat with lower energy level is upgraded into syngas chemical energy with higher energy level, and therefore a higher cold gas efficiency (CGE) is expected. The Aspen Plus Software is selected to simulate the novel coal gasification system. Then the exergy and Energy-Utilization Diagram (EUD) analyses are applied to disclose the plant performance enhancement mechanism. It reveals that 83.2% of syngas sensible heat can be recovered into steam agent and so the CGE is upgraded to 90%. And with the enhancement of CGE, the efficiency of an IGCC plant based on the novel gasification system can be as high as 51.82%, showing a significant improvement compared to 45.2% in a Texaco coal gasification based plant. At the same time, the exergy destruction of gasification process is reduced from 132.5MW to 98.4MW through thermochemical reactions. Lift of accepted energy level (Aea), and decrease of released energy level (Aed) and heat absorption (ΔH) contribute to the exergy destruction reduction in the gasification process. Additionally, since oxygen agent is no longer used in the IGCC, 34.5MW exergy loss in the air separation unit is avoided. Thereby the novel coal gasification technology proposed in this paper has a good thermodynamic performance and may provide a quite promising way for high efficient and clean coal utilization.

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Catalytic Coal Gasification Process Simulation with Alkaline Organic Wastewater in a Fluidized Bed Reactor Using Aspen Plus

Energies ◽

10.3390/en12071367 ◽

2019 ◽

Vol 12 (7) ◽

pp. 1367 ◽

Cited By ~ 1

Author(s):

Xiao ◽

Wang ◽

Zheng ◽

Qin ◽

Zhou

Keyword(s):

Process Simulation ◽

Equivalence Ratio ◽

Coal Gasification ◽

Aspen Plus ◽

Operating Conditions ◽

Catalytic Gasification ◽

Gasification Process ◽

Cold Gas Efficiency ◽

Gas Efficiency ◽

Organic Wastewater

A co-gasification process was proposed both for treating alkaline organic wastewater and to promote coal gasification by the alkaline substances in situ. A catalytic gasification model was developed by introducing a catalytic correction factor to describe the catalytic effects quantitatively. An integrated process simulation was carried out using Aspen Plus equipped with FORTRAN subroutines. The model was verified using the root mean square error between the simulation results and experimental data from the literature. Syngas composition, cold gas efficiency, and carbon conversion efficiency were analyzed with respect to different operating conditions (reaction temperature, steam/coal ratio, and equivalence ratio). The optimal conditions are summarized based on a self-sufficient system by using sensitivity analysis: Gasification temperature of 700 °C, steam/coal ratio = 1.0, and equivalence ratio = 0.4.

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