Effect of microwave pretreatment on the combustion behavior of lignite/solid waste briquettes

Li, Y.; Chen, Meiqian; Li, Q.H.; Huang, Yongda

doi:10.1016/j.energy.2018.02.087

Cited by 36 publications

(13 citation statements)

References 37 publications

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“…In order to thoroughly mix coal and molten salt, the molten salt layer was continuously bubbled with N 2 gas [2]. Meanwhile, the pyrolysis hot gas spreads homogeneously inside the reactor, contributing to uniform dispersion of coal particles and rapid heating of the solid particles [3]. After pyrolysis was finished, the basket was lifted from the salt into the cooling zone of the furnace.…”

Section: Pyrolysis Setupmentioning

confidence: 99%

“…The S bands represent sp 3 -rich structures such as alkyl-aryl CeC structures and methyl carbon dangling to an aromatic ring. Particularly, the S band can briefly measure cross-linking density and substitutional groups.…”

Section: Samplementioning

confidence: 99%

“…Coal is mostwidely used to satisfy the energy requirements due to its competitive price and high-energy density [2]. China's lignite reserves exceed 130 billion tons, accounting for 13% of the world's total reserves [3]. However, due to the high amount of moisture, low fixed carbon content, low ignition temperature and high amount of ash, currently 90% of lignite is utilized for power generation [4], which requires intensive energy and capital investment besides environmental problems.…”

Section: Introductionmentioning

confidence: 99%

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The effects of temperature and molten salt on solar pyrolysis of lignite

Zeng

Xie

et al. 2019

Energy

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Molten salt pyrolysis driven by concentrated solar radiation is well positioned to utilize solar energy and lignite effectively. This study focused on the effects of temperature (500, 600, 700 and 800 C) and molten carbonate salt (Li 2 CO 3-Na 2 CO 3-K 2 CO 3) on properties of char obtained from lignite pyrolysis, as well as gas and tar products for revealing their formation mechanism and transformation process. Molten salt pyrolysis of HulunBuir lignite produced more gas products and less char compared to conventional pyrolysis owing to the enhanced heat transfer and catalytic effect of molten salt. The char yield decreased from 58.4% to 43.4%, and the gas yield (especially CO 2 , H 2 and CO) increased from 28.3% to 46.1% at 800 C. CO 2 , CO and H 2 production increased about 60.43%, 103.42% and 65.2% at 800 C, respectively. Additionally, the presence of molten salt improved the tar quality with more hydrocarbon content (maximum increase of 5.8%) and less oxygenated compounds. The structure and reactivity relationship of char was characterized by XRD, BET, SEM, FTIR, Raman spectroscopy and TGA. Molten salt generated char had a higher reactivity due to the increase of disorder, surface area, microporosity (maximum of 71.74%) and active sites.

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Section: Pyrolysis Setupmentioning

confidence: 99%

Section: Samplementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The effects of temperature and molten salt on solar pyrolysis of lignite

Zeng

Xie

et al. 2019

Energy

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“…There are estimated to be more than one trillion tons of it across the world . Unfortunately, its inherent drawbacks of high water content, low calorific value, ready spontaneous combustion, and high transportation costs limit its application in traditional industry . Lignite contains abundant fulvic acid (FA) substances, which have special functions, high added value, and a wide range of applications.…”

Section: Introductionmentioning

confidence: 99%

Extraction and Functional Group Characterization of Fulvic Acid from Hami Lignite

Zhang

Liu

et al. 2019

ChemistrySelect

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This research investigates the extraction of fulvic acid (FA) from Hami lignite from Xinjiang, China, by microwave-hydrogen peroxide and microwave-hydrogen peroxide-formic acid methods. The effects of reaction time, oxidant concentration, oxygen-coal ratio and microwave power on FA yield are determined. Sulfuric acid-acetone was applied to purify the primary FA products. The results indicate that the oxidant concentration is a sensitive factor affecting the yield of FA, while reaction time has little effect. Formic acid can promote the extraction of FA from lignite by hydrogen peroxide, and under optimal experimental conditions, the yields of FA were 5.34% and 9.13%, respectively. UV-Vis analysis shows that FA has a lower aromaticity and degree of carbonyl conjugation in the presence of formic acid. Additionally, Fourier transform infrared spectroscopy was used to characterize the purified FA. The results show that the benzene rings of FA have one, two, three and four substitutions, oxygen-containing functional groups containing -COOH, C=O, -OCH 3 , CÀ OÀ C, Ar-OH, and R-OH and, furthermore, primary oxygen-containing functional groups consisting of C=O and C-OH. The aliphatic functional groups contain symmetrical and anti-symmetrical stretching vibrations of -CH 2 and -CH 3 . Finally, the hydrogen bonds are mainly composed of phenolic hydroxyls and alcoholic hydroxyls, while some hydrogen carboxylate is present.

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“…They found that with an increased biomass blending ratio, the burn rate accelerated. The biomass with higher volatile matter and water mass fraction exhibited an accelerated rate of weight loss in the initial stage of combustion [5]. Huang et al [6] used thermogravimetric analyser to analyse the combustion process of corn stalk, rice chaff, and wood that had been blended with coal.…”

Section: Introductionmentioning

confidence: 99%

Co‐firing characteristics and kinetic analysis of distillers’ grains/coal for power plant

et al. 2019

IET Renewable Power Generation

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The combustion of a biomass with coal may be one of the most effective methods to improve energy utilisation efficiency. This study aims to investigate the combustion characteristics of distillers' grains with bituminous coal using a thermogravimetric analyser. The results demonstrate that increasing the proportion of distillers' grains in coal results in a reduced ignition temperature (T i) and burnout temperature (T b), and activation energy (E) in the combustion stage. Therefore, the comprehensive combustion index (CCI) improves. In an O 2 /CO 2 atmosphere, T i increased by ∼15°C, while T b did not change much. However, E and CCI declined relative to an O 2 /N 2 atmosphere. Under the O 2 /CO 2 atmosphere, with an increase in O 2 concentration from 10 to 40%, T i changed over a small range, but T b declined from 745.8 to 641.4°C, while E and CCI improved. As the heating rate rose from 10 to 30°C/min, the values of T i decreased (from 281.4 to 244.9°C), but the values of T b increased significantly (from 662.8 to 745.8°C); the value of E reduced, and CCI also improved. This research could provide useful information as a practical reference for heat and power production.

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Effect of microwave pretreatment on the combustion behavior of lignite/solid waste briquettes

Cited by 36 publications

References 37 publications

The effects of temperature and molten salt on solar pyrolysis of lignite

The effects of temperature and molten salt on solar pyrolysis of lignite

Extraction and Functional Group Characterization of Fulvic Acid from Hami Lignite

Co‐firing characteristics and kinetic analysis of distillers’ grains/coal for power plant

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