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

Abstract : 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 (Li2CO3-Na2CO3-K2CO3) 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 CO2, H2 and CO) increased from 28.3% to 46.1% at 800 °C. CO2, CO and H2 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.
Document type :
Journal articles
Complete list of metadatas

Cited literature [45 references]  Display  Hide  Download

https://hal-mines-albi.archives-ouvertes.fr/hal-02149242
Contributor : Imt Mines Albi Ecole Nationale Supérieure Des Mines d'Albi-Carmaux <>
Submitted on : Tuesday, June 11, 2019 - 10:40:39 AM
Last modification on : Thursday, August 8, 2019 - 2:29:53 PM

File

 Restricted access
To satisfy the distribution rights of the publisher, the document is embargoed until : 2019-11-29

Please log in to resquest access to the document

Identifiers

Collections

Citation

Xiao He, Kuo Zeng, Yingpu Xie, Gilles Flamant, Haiping Yang, et al.. The effects of temperature and molten salt on solar pyrolysis of lignite. Energy, Elsevier, 2019, 181, pp.407-416. ⟨10.1016/j.energy.2019.05.181⟩. ⟨hal-02149242⟩

Share

Metrics

Record views

53