Bio-oil Production from Various Biomass Feedstocks by Vacuum Pyrolysis

Name: Peerapong Yuenyongchaiwat

keyword: Vacuum pyrolysis

Abstract: This study proposes bio-oil production by pyrolysis as a pretreatment method and the uses of bio-oil as an alternative to the direct utilization of biomass. Because of various biomass feedstocks available in Thailand, the selection of biomass feedstocks for this study is based primarily on the resource potential and the fouling potential of biomass; however, is also extended to cover a wide range of properties so that the generalized database can be established. The selected biomass feedstocks include rice straw, eucalyptus bark/root, rice husk, rubber wood (a representative sample of softwood) and Shorea obtuse (a representative sample of hardwood). The experiments were carried out using a lab-scale vacuum pyrolysis system operated on a batch mode. The effect of temperature and properties of biomass on the yield and characteristics of the pyrolysis products (char, gas, bio-oil and water), especially bio-oil, will be investigated. All the experiments were conducted under the following pyrolysis conditions: heating rate of 30 ํC/min, holding time 1 hour, and particle size of 250-425 mue m. The results show that the maximum liquid yields were obtained at different pyrolysis temperatures depending on type of biomass but in the range of 450-550 ํC. The maximum liquid yields were in the range of 49.07-61.18 wt%, the highest of which was that of eucalyptus. The water content was excessively high, i.e. 45-63 % based on the weight of liquid products as the temperature increased, continuous decrease in solid yield and increase in gas yield were similarly observed for all samples. Determination of the product gas yields (CO, C02, CH4 and H2) showed that CO and CO2 are the dominating species. The product analyses showed that bio-oils were almost free from alkali metals (Ca, Na, Mg and K) and that those metals and chlorine were preferentially retained in the solid char. It is, therefore, expected that the fouling problem in boilers fired with the biomass derived pyrolysis oil also having higher energy density compared to the raw biomass should be reduced. However, its high water content and acidity still require upgrading to avoid corrosion in end-use applications. The alkali-rich char can be further utilized for agricultural purpose as bio-fertilizer or soil conditioner, or with suitable treatment a precursor for activation carbon production.

King Mongkut's University of Technology Thonburi. KMUTT Library

Address: BANGKOK

Email: info.lib@mail.kmutt.ac.th

Name: Sirintornthep Towprayoon

Role: Advisor

Created: 2010

Modified: 2012-01-05

Issued: 2555-01-03

วิทยานิพนธ์/Thesis

application/pdf

CallNumber: JGSEE263

eng

DegreeName: Master of Science

Level: Master's Degree

Descipline: Energy Technology

Grantor: King Mongkut's University of Technology Thonburi

©copyrights King Mongkut's University of Technology Thonburi

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