Coal pyrolysis in a fluidized bed reactor simulating the process conditions of coal topping in CFB boiler

Zhang, Xiaofang; Dong, Li; Zhang, Juwei; Tian, Yajun; Xu, Guangwen

doi:10.1016/j.jaap.2011.02.013

Cited by 42 publications

(23 citation statements)

References 9 publications

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“…The present study succeeds to our previous investigation of coal pyrolysis in a quartz-sand bed fluidized with composition-varied gases but with an instantaneous coal sample drop (a few grams) into the temperature-preset reactor [16,17]. The coal pyrolysis in a laboratory fluidized bed reactor with continuous coal feed and char discharge was tested in this study.…”

Section: Introductionsupporting

confidence: 51%

“…Table 2 shows that there was particularly more CH 4 and C 2 hydrocarbons when H 2 was presented, while both the CO and CO 2 fractions slightly decreased due to probably the enhanced methanation reactions. The reduced tar production when including CO 2 was attributed to both the higher freeboard temperature of the reactor (Table 2) at the increased CO 2 fraction and its enhanced reforming reactions of tar [17].…”

Section: Variation With Other Gases In O 2 -Free Atmospherementioning

confidence: 99%

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Continuous high-temperature fluidized bed pyrolysis of coal in complex atmospheres: Product distribution and pyrolysis gas

Zhong

Zhang

Zhou

et al. 2012

Journal of Analytical and Applied Pyrolysis

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Section: Introductionsupporting

confidence: 51%

Section: Variation With Other Gases In O 2 -Free Atmospherementioning

confidence: 99%

Continuous high-temperature fluidized bed pyrolysis of coal in complex atmospheres: Product distribution and pyrolysis gas

Zhong

Zhang

Zhou

et al. 2012

Journal of Analytical and Applied Pyrolysis

Self Cite

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“…These free radicals can be stabilized by combining with other small free radicals, such as the H radical, to form volatiles including tar and gas products [16]. Otherwise, the free radicals recombine with themselves to form heavy products such as coke.…”

Section: Pyrolysis Experimentsmentioning

confidence: 99%

“…Slow gas flow rates increase the contact time of PG with the Ni/MgO catalyst, which can produce more small free radicals such as CH 3 , CH 2 , CH, and H. The small free radicals, formed by the effective dissociation of PG at a low flow rate, can rapidly combine with the free radicals cracked during coal pyrolysis. This is beneficial to the formation of tar [16]. However, higher flow rates lead to a shorter contact time on the catalyst active site.…”

Section: Effect Of Gas Flow Ratementioning

confidence: 99%

“…Coal pyrolysis using hydrogen-rich mixed gases such as coke oven gas has been studied [14][15][16][17]. Liao et al [14] investigated the pyrolysis of lignite under coke oven gas and found that pyrolysis under this gas leads to a higher oil yield and larger benzenetoluene-xylene (BTX) fractions, phenol-cresols-xylenols (PCX) fractions, and naphthalene yields than hydropyrolysis at the same partial pressure of H 2 gas.…”

Section: Introductionmentioning

confidence: 99%

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Catalytic Pyrolysis of Bituminous Coal under Pyrolysis Gas over a Ni/MgO Catalyst

Zhu

Zhang

et al. 2017

Chem Eng & Technol

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To improve the yield and quality of coal pyrolysis tar while using pyrolysis gas (PG), a Ni/MgO catalyst was introduced to catalyze the pyrolysis of bituminous coal under a PG atmosphere. The effects of pyrolysis temperature, gas flow rate, catalyst packing methods, and atmosphere composition on coal pyrolysis were investigated. The yield and quality of tar obtained from Shihezi (SHZ) bituminous coal pyrolysis under N 2 , PG, and PG over a Ni/MgO catalyst were found to vary with the increase of pyrolysis temperature. The catalyst packed in the upper layer results in higher tar yields, but mixing the catalyst and coal leads to an increase in the maltene yield. The components in PG improved the tar yield and tar quality. Finally, a higher tar yield can be obtained from SHZ coal pyrolysis under CO/H 2 , CO 2 /H 2 , and CO 2 /CH 4 atmospheres using a Ni/MgO catalyst.

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Effects of CO Atmosphere on the Pyrolysis of a Typical Lignite

Wang

Guo

et al. 2020

Chem Eng & Technol

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To reveal the effect mechanism of CO atmosphere on coal pyrolysis, a study on raw and demineralized lignite was carried out in a horizontal tube furnace under N2 and CO/N2 atmosphere. CO had a negligible effect on the char yield at low temperatures, whereas it enhances the char yield at temperatures higher than 550 °C. The release of tar was higher in the presence of CO above 450 °C because of more free radicals, which reduced low‐temperature crosslinking, and higher selectivity of hydroxyl groups to phenols in the CO‐containing atmosphere. The yields of CO2 and H2 increased, water and CO yields decreased under CO/N2 atmosphere. Light hydrocarbon gases were not affected by changing the reaction atmosphere. The difference between product yields from raw and demineralized coal confirmed that the catalysis of inherent minerals had a great catalytic effect on the water‐gas shift reaction and Boudouard reaction.

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Coal pyrolysis in a fluidized bed reactor simulating the process conditions of coal topping in CFB boiler

Cited by 42 publications

References 9 publications

Continuous high-temperature fluidized bed pyrolysis of coal in complex atmospheres: Product distribution and pyrolysis gas

Continuous high-temperature fluidized bed pyrolysis of coal in complex atmospheres: Product distribution and pyrolysis gas

Catalytic Pyrolysis of Bituminous Coal under Pyrolysis Gas over a Ni/MgO Catalyst

Effects of CO Atmosphere on the Pyrolysis of a Typical Lignite

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