Water Leaching Pre-Treatment of Different Lignocellulosic Biomass: A Detailed Study on Process Parameters, Kinetics, Thermodynamic Equilibrium Modelling, and Pyrolysis Product Yields

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Abstract

Water washing can be used as an effective pretreatment method to improve the fuel properties and composition of agricultural residues. However, it still requires further improvement to deliver high-quality products and be applied on an industrial scale. In the present study, effectiveness of washing pretreatment in different kind of lignocellulosic biomass –Wheat Straw, empty fruit bunches of oil palm (EFB), and spruce bark. All the feedstocks were studied in detail by varying basic leaching parameters – leaching duration (0-180 min), feedstock size (0.05 to 3 cm), solid-to-liquid ratio (1:15- 1:20), water temperature (20 to 80 °C), and mechanical pressing. Two pilot scale experiments are also conducted. The biomass composition, heating values, energy loss, and fouling and slagging propensity were evaluated for treated and untreated samples. The washing effect was also evaluated on bio-oil and biochar yield and quality resulting from the pyrolysis process. Furthermore, using thermodynamic equilibrium modelling (TEM) ash fusion behavior was also studied to predict various ash related issues in combustion and gasification. High removal of sodium (20-85%), potassium (15-80%), chlorine (18- 99%), sulphur (10-80%), nitrogen (5-59%), and ash (8-57%) was observed in all biomass samples after washing, which follows second-order leaching kinetics. Washing also improved the yields, and quality of the bio-oil and biochar obtained from the pyrolysis. Furthermore, result of TEM shows that ash transformation behaviour improves substantially after pretreatment. Raw biomass shows notable amounts of chemical compounds and molten slag responsible for alkali-induced fouling and slagging, especially at higher temperatures (850-1100°C) such as KCl, K2SO4, K2CO3, KOH, Na2SO4, NaCl etc. Water washing considerably reduces the formation of such problematic compounds and molten slag. So, based on TEM much less fouling and ash-related issues can be expected from the washed biomass.
Original languageEnglish
Title of host publicationThe proceedings of Venice international symposium on energy from biomass and waste
EditorsIWWG group
PublisherCISA Publisher
Number of pages14
ISBN (Electronic)9788862650298
Publication statusPublished - Nov 2022
Publication typeA4 Article in conference proceedings
EventInternational symposium on energy from biomass and waste - Venice, Italy
Duration: 21 Nov 202223 Nov 2022
Conference number: 9

Conference

ConferenceInternational symposium on energy from biomass and waste
Country/TerritoryItaly
CityVenice
Period21/11/2223/11/22

Keywords

  • Leaching
  • Thermochemical conversion
  • Fouling
  • Corrosion
  • Pyrolysis
  • Biomass Pretreatment

Publication forum classification

  • Publication forum level 0

ASJC Scopus subject areas

  • General Energy
  • General Engineering
  • General Chemical Engineering

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