Experimental study on the self-heating characteristics of Indonesian lignite during low temperature oxidation

Zhao, Huan; Yu, Jianglong; Liu, Junshuai; Tahmasebi, Arash

doi:10.1016/j.fuel.2015.01.108

Cited by 44 publications

(15 citation statements)

References 39 publications

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“…At atmospheric pressure, the oxidation of coal would also have occurred at a temperature  200°C [33]. The establishment of these facts evidently proves that devolatilization and char combustion accompanied the oxidation of the coal.…”

Section: Effect Of Temperature and Ca/s Ratio On The So 2 Profile Witmentioning

confidence: 83%

Sulfur Removal in Bio-Briquette Combustion Using Seashell Waste Adsorbent at Low Temperature

Mahidin

Gani

Muslim

et al. 2016

J. Eng. Technol. Sci.

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Abstract. Presently, biomass is mostly utilized as co-fuel in coal combustion in view of energy diversification and emission reduction. However, since the coal content of bio-briquettes is high (up to 80% in this study), gas emissions such as those of SO x still occur. Therefore, the introduction of SO 2 adsorbent is common in coal briquette or bio-briquette combustion. A calcium-based material is usually used for this goal. The aim of this study was to observe the effects of desulfurization temperature and Ca/S ratio (Ca = calcium content in adsorbent; S = sulfur content in coal and biomass) on desulfurization efficiency and kinetics. The ratio of coal to biomass (palm kernel shell/PKS) was fixed at 90:10 (wt/wt) and the ratios of Ca to S were varied at 1:1, 1.25:1, 1.5:1, 1.75:1 and 2:1. The mixtures of coal, PKS and adsorbent were briquetted at a molding pressure of 6 ton/cm 2 with Jatropha curcas seeds and starch mixture as binding agents. Desulfurization was performed within a temperature range of 300 to 500°C for 720 seconds at an airflow rate of 1.2 L/min. The results showed that the highest desulfurization efficiency (90.6%) was associated with the Ca/S ratio of 2:1 and temperature of 400°C. Moreover, the highest reaction rate constant of desulfurization was 0.280 min -1 .

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Section: Effect Of Temperature and Ca/s Ratio On The So 2 Profile Witmentioning

confidence: 83%

Sulfur Removal in Bio-Briquette Combustion Using Seashell Waste Adsorbent at Low Temperature

Mahidin

Gani

Muslim

et al. 2016

J. Eng. Technol. Sci.

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“…If a high yield of hydrogen‐rich syngas can be achieved through the production and transformation of hydrogen by efficient and low‐carbon pyrolysis of lignite with a high hydrogen content, it will significantly facilitate the transformation of the world's energy supply from fossil energy to new energy. Various influencing factors during lignite pyrolysis, such as the pyrolysis temperature, heating rate, size of the coal particles, and addition of a catalyst, have been studied extensively. However, the selection of an appropriate pyrolysis method should be the most fundamental and efficient way to improve the efficiency of hydrogen production through the pyrolysis of lignite.…”

Section: Introductionmentioning

confidence: 99%

“…More than 90 %o fl ignite exploited worldwide is still combusted directly for power generation in electric power stations near coal mines.I nt his way,r esourcesc annot be utilizede fficiently andc ost effectively,a nd high emissions of carbon dioxide occur. [9][10][11][12] If ah igh yield of hydrogen-rich syngas can be achieved through the production and transformation of hydrogen by efficient and low-carbonp yrolysis of lignite with ah igh hydrogenc ontent, it will significantlyf acilitate the transformation of the worlds energy supply from fossil energy to new energy.V arious influencing factors during lignite pyrolysis, such as the pyrolysis temperature, [13] heating rate, [14,15] size of the coal particles, [16] and additiono facatalyst, [17][18][19][20] have been studied extensively.However, the selection of an appropriate pyrolysis method should be the most fundamental and efficient way to improve the efficiency of hydrogen production through the pyrolysis of lignite.I nr ecent years,m icrowave pyrolysis,a sanew type of technology for cleaning and utilizing coal, has been applied in the pyrolysis of lignite and presentssignificant advantages such as auniqueheat-transfer profile,r eadily controlled pyrolysis,a nd high yields of the target products. [21] Therefore,l ignite from Dongsheng in Inner Mongolia, one of the regions with the largestr eserves of lignite in China, was selected as the subject of our research.…”

Section: Introductionmentioning

confidence: 99%

Production of Hydrogen‐Rich Syngas from Lignite using Different Pyrolysis Methods

Wang

Chen

2016

Energy Tech

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The efficiency of hydrogen production by the pyrolysis of lignite from Dongsheng in Inner Mongolia was investigated. Three pyrolysis methods, namely, temperature‐programmed pyrolysis, isothermal pyrolysis, and microwave pyrolysis, were applied and compared. The online analysis of the composition of the pyrolysis gas showed the effects of the different pyrolysis methods on the gas composition and the yield of hydrogen. The reasons were discussed on the basis of infrared thermography of the semicoke samples, FTIR spectroscopy, and SEM analysis. The microwave pyrolysis was improved by the addition of a shimming device to the furnace chamber. Consequently, the efficiency of hydrogen production by the pyrolysis of lignite was increased substantially, and the yield of hydrogen surged by 430 % compared with the yield for the original microwave pyrolysis.

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“…The pyrolysis of the lignite can be used as an important basic step in the comprehensive utilization of the coal, and the effects of temperature, heating rate, granularity and catalyst as well as changes in pyrolysis products during the pyrolysis have been researched by many scholars widely and thoroughly. As a new clean coal technology, microwave pyrolysis has an easy‐to‐control process and high yield of the objective product due to its fast heating rate.…”

Section: Introductionmentioning

confidence: 99%

Permittivity‐Based Microwave Absorption Characteristics of Dongsheng Lignite during Pyrolysis

2016

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The complex relative permittivity of Chinese Dongsheng lignite coal was acquired by testing the parameters S11 and ψS11 and adopting an artificial neural network model for calculation. The curves of relative dielectric coefficient, which vary with the temperature in the pyrolytic reaction process, were used to reflect the microwave absorption characteristics of Dongsheng lignite coal. By combining and analyzing the thermogravimetric curves, it was determined that, with the increasing pyrolysis temperature, the value of the dielectric coefficient ɛ′,ɛ′′ changes for Dongsheng lignite can be separated into three distinct stages: room temperature to 400 °C, 400–700 °C, and 700–800 °C. The microwave absorption ability for lignite enhances quickly in the range of 400–700 °C and reaches a peak value at 700 °C, which has important implications for lignite pyrolysis.

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Experimental study on the self-heating characteristics of Indonesian lignite during low temperature oxidation

Cited by 44 publications

References 39 publications

Sulfur Removal in Bio-Briquette Combustion Using Seashell Waste Adsorbent at Low Temperature

Sulfur Removal in Bio-Briquette Combustion Using Seashell Waste Adsorbent at Low Temperature

Production of Hydrogen‐Rich Syngas from Lignite using Different Pyrolysis Methods

Permittivity‐Based Microwave Absorption Characteristics of Dongsheng Lignite during Pyrolysis

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