Predicting Behavior of Coal Ignition in Oxy-fuel Combustion

Cahyadi,; Surjosatyo, Adi; Nugroho, Yulianto Sulistyo

doi:10.1016/j.egypro.2013.06.018

Cited by 22 publications

(5 citation statements)

References 22 publications

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“…Wang et al [29] found that the TG curves of coal and coke combustion in O 2 /CO 2 tended to be higher temperature range compared with conventional combustion. This was in accordance with the research results of Cahyadi et al [30] and Ren et al [12]. The above-mentioned studies only focused on the ignition, burnout, and weightlessness delay, the heat release of coal oxygen-lean combustion was not studied in details.…”

Section: Introductionsupporting

confidence: 88%

Quantitative Analysis of Heat Release during Coal Oxygen-Lean Combustion in a O2/CO2/N2 atmosphere by TG-DTG-DSC

Shi

et al. 2022

Preprint

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Coal combustion in an oxygen-lean and multi-gas environment is a common exothermic phenomenon for coalfield fires, leading to serious environmental destruction and loss of coal resources. Simultaneous thermal analysis experiments for Bulianta (BLT, high-volatile bituminous coal) and Yuwu coal (YW, anthracite) in 21vol.%O2/79vol.%N2 and 15vol.%O2/5vol.%CO2/80vol.%N2 were carried out to study the law of heat release. Based on the TG-DTG-DSC curves, the combustion characteristic parameters were analyzed. A delay of ignition and heat release existed during the coal oxygen-lean combustion in O2/CO2/N2. Decreasing O2 concentration caused a significant reduction of local reactivity and further the decreasing maximum heat release rate for low-rank coal, while increasing CO2 concentration caused a significant thermal lag effect and further the increasing maximum heat release rate for high-rank coal. The relationship between the heat release rate and the reaction rate constant was quantitatively analyzed. At the increasing stage of the heat release rate, the heat release rate of the two coals increased conforming to ExpGro1 exponential model. At the decreasing stage of the heat release rate, the heat release rate of YW coal decreased exponentially with the reaction rate constant, while the heat release rate of BLT coal decreased linearly. Regardless of the atmospheres, the conversion rates corresponding to maximum heat release rate of BLT and YW coal were about 0.80 and 0.50, respectively, indicating that the coal rank played a dominant role. The results are helpful to understand the heat release process of coal oxygen-lean combustion in O2/CO2/N2.

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Section: Introductionsupporting

confidence: 88%

Quantitative Analysis of Heat Release during Coal Oxygen-Lean Combustion in a O2/CO2/N2 atmosphere by TG-DTG-DSC

Shi

et al. 2022

Preprint

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“…The results of Khatami et al, Niu et al, and Cahaydi et al suggested that, in oxy-fuel combustion conditions, the same profile of combustion temperatures in atmospheric air was achieved using a reagent mixture containing 30% O 2 in CO 2 . In this work, in addition to using this recommended concentration, we also used concentrations of 10 and 20% of O 2 in CO 2 to determine the chemical phenomenon that governs the reaction.…”

Section: Results and Discussionmentioning

confidence: 90%

Kinetics of the Oxy-fuel Combustion of High-Ash-Content Coal from the Candiota Mine, Rio Grande do Sul

2016

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The work presents a kinetic study of the oxy-fuel combustion reaction of coal with a high content extracted from the Candiota mine, Rio Grande do Sul. The aim of the study was to collect data of the southern Brazil coal in oxy-fuel combustion conditions. In this technology, combustion burning occurs with a mixture of O 2 and a high CO 2 content. The experiments were performed isothermally at temperatures of 873−1173 K at atmospheric pressure, with O 2 concentrations ranging between 10 and 30% (v/v) in CO 2 . Initially, the coal pyrolysis temperature was determined to eliminate volatile matter, thus avoiding its influence on the oxy-fuel combustion reaction. The experimental results were treated mathematically with models from the literature to determine the kinetic parameters, including the activated energy and reaction order.

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“…The study rst related to the identi cation of the effect of particle size on the reactions. At the su cient level of oxygen, the smaller coal particle size has a faster rate of reactions than the bigger size [24,37].…”

Section: Resultsmentioning

confidence: 99%

Investigation of thermochemical process of coal particle packed bed reactions for the development of UCG

Sutardi

Wang

Karimi

et al. 2020

Preprint

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In this study, a packed bed reactor is developed to investigate the gasification process of coal particles. The effects of coal particle size and heater temperature of reactor are examined to identify the thermochemical processes through the packed bed. Three different coal samples with varying size, named as A, B, and C, are used, and the experimental results show that the packed bed with smaller coal size has higher temperature, reaching 624oC, 582oC, and 569oC for coal A, B, and C respectively. In the case of CO formation, the smaller particle size has greater products in the unit of mole fraction over the area of generation. However, the variation in the porosity of the packed bed due to different coal particle sizes affects the reactions through the oxygen access. Consequently, the CO formation is least from the coal packed bed formed by the smallest particle size A. A second test with the temperature variations shows that the higher heater temperature promotes the chemical reactions, resulting in the increased gas products. The findings indicate the important role of coal seam porosity in UCG (underground coal gasification) application, as well as temperature to promote the syngas productions.

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Predicting Behavior of Coal Ignition in Oxy-fuel Combustion

Cited by 22 publications

References 22 publications

Quantitative Analysis of Heat Release during Coal Oxygen-Lean Combustion in a O2/CO2/N2 atmosphere by TG-DTG-DSC

Quantitative Analysis of Heat Release during Coal Oxygen-Lean Combustion in a O2/CO2/N2 atmosphere by TG-DTG-DSC

Kinetics of the Oxy-fuel Combustion of High-Ash-Content Coal from the Candiota Mine, Rio Grande do Sul

Investigation of thermochemical process of coal particle packed bed reactions for the development of UCG

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