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Optimization of the performance ofdown-draft biomass gasifier installedat National Engineering Research &Development (NERD) Centre ofSri Lanka
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
Abstract [en]

Using biomass gasification to produce combustible gas is one of the promising sustainable energy optionsavailable for many countries. At present, a few small scale community based power generation systemsusing biomass gasifiers are in operation in Sri Lanka. However, due to the lack of proper knowledge, thesesystems are not being operated properly in full capacity. This stands as an obstacle for further expansionof the use of gasifier technology.The objective of this study was to identify the most influential parameters related to fuel wood gasificationwith a down draft gasifier in order to improve the gasification processes.A downdraft gasifier of 10kW electrical capacity was used to study the effect of equivalent ratio (Actual airfuel ratio to Stoicheometric air fuel ratio: ER) on the specific gas production, the heating value of gasproduced and the cold gas efficiency using three throat diameters (125mm, 150mm and 175mm). Six trialswere carried out for each throat diameter by varying the supply air flow to change the ER. The gassamples were tested for their compositions under steady state operating conditions. Using mass balancesfor C and N, the cold gas efficiencies, calorific values and the specific gas production rates weredetermined.The results showed that with all throat diameters the calorific value of gas reduced with the increase ofER. The cold gas efficiency reduced with ER in a similar trend for all three throat diameters. The specificgas production increased with ER under all throat diameters.Calorific value and specific gas production are changing inversely proportional manner. The ER to beoperated is depends on the type of application of the gas produced and engine characteristics. When alarge heat is required, low ER is to be used in which gas production is less. In the opposite way, when alarge amount of gas is needed, higher value of ER is recommended.

Place, publisher, year, edition, pages
2012.
Keyword [en]
Renewable Energy, Biomass Gasification, Downdraft Gasifier
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-78994OAI: oai:DiVA.org:kth-78994DiVA: diva2:494620
Educational program
Master of Science - Sustainable Energy Engineering
Presentation
2012-01-17, 10:00 (English)
Uppsok
Technology
Supervisors
Examiners
Available from: 2012-02-09 Created: 2012-02-08 Last updated: 2012-02-09Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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