The characteristics of mineralogy, morphology and sintering during co-combustion of Zhundong coal and oil shale

Lu, Yang; Wang, Ying; Zhao, Yuqiong; Zheng, Wei; Li, Yuan; Wang, Hao; Zhang, Yongfa

doi:10.1039/c7ra10340a

Cited by 20 publications

(5 citation statements)

References 42 publications

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“…The release of Na during Zhundong lignite combustion is dependent on combustion temperature. , At combustion temperature 1200 °C, most Na would be released into the gas phase. However, as the combustion temperature decreased from 1050 to 850 °C, more Na would be retained in the residue ash. , This brings the benefits of circulating fluidized bed (CFB) combustion burning Zhundong lignite. As reported in the literature, − ash slagging in a traditional CFB furnace at typical temperatures 850–950 °C would be decreased due to the violent gas–solid flow within the furnace.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation into Ash Deposition and Na Migration Characteristics during Combustion of High Sodium Zhundong Lignite in a Circulating Fluidized Bed Operating at Low Temperatures

Liu

Zhu

et al. 2019

Energy Fuels

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The mineralogical, morphological, and chemical characteristics of ash deposits during combustion of Zhundong lignite (<3 mm) in a 0.2 t d–1 circulating fluidized bed (CFB) operating at relatively low temperatures, that is, 800–760 and 750–680 °C, were investigated. Two air-cooled probes were installed in the furnace dilute phase (P1) and the cyclone outlet (P2) to simulate ash deposition. The deposits along with the bottom ash and fly ash were collected and analyzed by using scanning electron microscopy energy-dispersive X-ray spectroscopy, X-ray diffraction, and inductively coupled plasma optical emission spectroscopy. Results showed that the P1 deposit composed of melted Ca/Na sulfate particles at 800 °C but became granular Na/Ca/Mg aluminosilicate particles at 750 °C. Likewise, the P2 deposit comprised agglomerated particles rich in Na2SO4 and CaSO4 at 800 °C but became discrete Na2SO4 and NaCl particles at 750 °C. The bottom ash was enriched with (Ca,Na)(Si,Al)4O8 and Na2SO4 at 800 °C but turned into Na2SO4, (Na,K)(Si3Al)O8 at 750 °C. The Na content in the bottom ash correspondingly increased from 31.3 to 36.5 mg g–1, retaining more Na in the bottom ash at 750 °C. The fly ash also became discrete particles enriched in Na2SO4 and NaCl. The CFB combustion at 750–680 °C thus decreased the release of Na and the sintering propensity of ash particles and consequently lessened their deposition propensity.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation into Ash Deposition and Na Migration Characteristics during Combustion of High Sodium Zhundong Lignite in a Circulating Fluidized Bed Operating at Low Temperatures

Liu

Zhu

et al. 2019

Energy Fuels

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“…Advanced geological exploration techniques are essential for identifying and locating oil shale deposits [1,29]. Traditional oil shale exploration techniques involve drilling wells and analyzing core samples to determine the organic content and quality of the rock.…”

Section: Exploration Methodsmentioning

confidence: 99%

“…Oil shale, an organic-rich sedimentary rock, holds significant potential as an unconventional energy source due to its abundant kerogen content, which can be converted into shale oil and gas through various extraction processes such as pyrolysis, retorting, and in situ conversion. With the world's increasing demand for energy [1], the exploration and exploitation of oil shale resources have gained considerable attention in recent years. However, the development of oil shale reserves presents several challenges, including complex geological structures, variable quality, and environmental concerns.…”

Section: Introductionmentioning

confidence: 99%

Advancements and Environmental Implications in Oil Shale Exploration and Processing

Jia

2023

Applied Sciences

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This comprehensive review presents a holistic examination of oil shale as a significant energy resource, focusing on its global reserves, extraction technologies, chemical characteristics, economic considerations, and environmental implications. Oil shale, boasting reserves equivalent to approximately 6 trillion barrels of shale oil worldwide, holds substantial potential to augment the global energy supply. Key extraction methods analyzed include surface mining, modified in situ, and true in situ conversion processes, each exhibiting distinct operational parameters and efficiencies. The review further delves into the chemical aspects of oil shale retorting and pyrolysis, highlighting the critical role of variables such as retorting temperature, residence time, particle size, and heating rate in determining the yield and composition of shale oil and byproducts. Economic analyses reveal that capital and operating costs, which vary according to the specific extraction and processing technologies implemented, are crucial in appraising the economic feasibility of oil shale projects. Lastly, the review acknowledges the potential environmental hazards linked with oil shale development, such as groundwater contamination and harmful emissions. It emphasizes the importance of rigorous monitoring programs, environmental impact assessments, sustainable technologies, and innovative strategies like co-combustion and comprehensive utilization systems in mitigating such impacts. The review underlines the need for a balanced approach that harmonizes technological advancement, economic viability, and environmental sustainability in oil shale exploitation.

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“…In this modeling, the reaction rate constant (k) was unchanged because the temperature (T) was constant according to eqn (2). As the pressure (P) increased, the molar amount (n) and/or concentration [x] of the reactants increased because the gas volume (V) was constant according to eqn (3). Thereaer, the reaction rate (r) augments exponentially with the increase of [x] according to eqn (1).…”

Section: Rop Analysis Of Nomentioning

confidence: 99%

“…Greenhouse gases emitted from coal-red power plants, industrial boilers, and other energy utilization equipment are preferentially enrolled in the blacklist for emission reduction due to the pressure posed by increasing environmental awareness. [1][2][3] Researchers worldwide are developing new combustion techniques for energy conservation and emission reduction. Oxy-fuel combustion is one of the most promising approaches due to its low CO 2 , NO x , and SO x emissions and high combustion efficiency of pulverized coal.…”

Section: Introductionmentioning

confidence: 99%

Simulation of nitrogen transformation in pressurized oxy-fuel combustion of pulverized coal

et al. 2018

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The characteristics of mineralogy, morphology and sintering during co-combustion of Zhundong coal and oil shale

Abstract: The high-sodium coal from the Zhundong region induces severe ash-related problems during combustion.

Cited by 20 publications

References 42 publications

Experimental Investigation into Ash Deposition and Na Migration Characteristics during Combustion of High Sodium Zhundong Lignite in a Circulating Fluidized Bed Operating at Low Temperatures

Experimental Investigation into Ash Deposition and Na Migration Characteristics during Combustion of High Sodium Zhundong Lignite in a Circulating Fluidized Bed Operating at Low Temperatures

Advancements and Environmental Implications in Oil Shale Exploration and Processing

Simulation of nitrogen transformation in pressurized oxy-fuel combustion of pulverized coal

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