Study on moisture re-adsorption characteristics and thermodynamic parameter analysis of indonesian lignite

Xianchun Li, Jianglong Yu

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2 Citations (Scopus)

Abstract

Using the moisture re-adsorption experimental rig, the desorption and adsorption isotherms of an Indonesian lignite were studied at the temperature of 30℃ and 40℃. The effect on moisture re-adsorption characteristics of coal particle size and drying temperature were studied. According to the principle of thermodynamics of porous media isothermal adsorption, the Indonesian lignite isothermal adsorption heat was calculated. The results show the irreversibility of the moisture desorption and adsorption isotherms of the coal in the desorption-adsorption cycles, indicating that the irreversible coal structure changes during drying conditions, which is dependent on drying temperature and independent of the coal particle size. The equilibrium moisture content decreased with the increasing drying temperature. The adsorption heat is a little higher than the latent heat of evaporation while the equilibrium moisture content is more than 7%. The water vapor is physically adsorbed on the particle surface and capillary pore surfaces. The formation of hydrogen bond between the water molecules and the surface functional groups during the moisture re-adsorption process is not evident.

Original languageEnglish
Pages (from-to)136-141
Number of pages6
JournalZhongguo Dianji Gongcheng Xuebao
Volume34
DOIs
Publication statusPublished - 20 Nov 2014
Externally publishedYes

Keywords

  • Adsorption heat
  • Adsorption rate
  • Equilibrium moisture content
  • Indonesian lignite
  • Moisture re-adsorption

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