SINGLE PARTICLE COMBUSTION ANALYSIS OF BIOMASS FUELS BY USING WIRE MESH REACTOR

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2021-7-30

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GÜREL, KAAN

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This thesis investigates the single particle combustion behavior of a Turkish lignite and two agricultural biomass fuels using a recently developed wire mesh reactor coupled with a high-speed camera. The fuels under investigation are endogenous of Turkey and present potential to gradually replace the currently burned lignite coals for electricity generation. This change requires a large amount of data so that the oftentimes disparate fuels can be properly co-fired. The scientific outcome of the study will be understanding the influence of fuel type, particle size and mass, and thermal pre-treatment on parameters such as the ignition delay time and burnout time which are of extreme importance for co-firing purposes. The wire mesh reactor to be used enables conditions that resemble those found in large scale combustion systems (i.e., high temperatures and high heating rates). The fuel particles with different masses were heated to 1000 ºC by radiation with a heating rate of 900ºC/s. To understand the effects of thermal pre-treatment, fuels are torrefied, slow and fast pyrolyzed. The time analysis demonstrated that the particle mass and size did not affect ignition delay time; however, slow pyrolysis had a significant effect on the ignition delay time. The ignition delay time was tremendously increased for the chars produced from slow pyrolysis (~10 s) compared to raw (~3 s) and other heat-treated vi particles (~4 s) for all fuels. Burnout times of all fuels increased proportionally with particle mass. Fast and slow pyrolysis generally increased the char combustion and burnout times. The average burnout times for chars from fast and slow pyrolysis of biomass was ~20 s and ~29 s, respectively, while those of raw biomass was ~9 s. The average burnout times for chars from fast and slow pyrolysis of lignite was ~20 s and ~53 s, respectively, while those of raw lignite was ~19 s, when 2 mg particles were compared. Chars from fast pyrolysis of both biomasses had similar burnout times (~20 s) compared to the that of raw Tunçbilek Lignite (~19 s). This depicts the potential of co-firing TL with biomass chars produced from fast pyrolysis.

Subject Keywords

Singe Particle, Pyrolysis, Torrefaction, Biomass, Wire Mesh Reactor, Tek Parçacık, Piroliz, Kavurma, Biyokütle, Tel Örgü Reaktörü

URI

https://hdl.handle.net/11511/91703

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

K. GÜREL, “SINGLE PARTICLE COMBUSTION ANALYSIS OF BIOMASS FUELS BY USING WIRE MESH REACTOR,” M.S. - Master of Science, Middle East Technical University, 2021.