Erik Tolonen will be presenting his thesis seminar on Friday 23rd November at 2:30pm in SITE B0138. All are invited to attend.
The title of Erik’s talk is “Evaporation Characteristics of a Liquid Bio-Fuel Derived From Chicken Litter”. The talk abstract follows below.
Liquid bio-fuels can be produced from various types of waste biomass by the process of fast pyrolysis, and upgraded using the techniques of microwave solvent extraction and column chromatography. The evaporation characteristics of this fuel as single droplets were studied, and a numerical model developed to describe this process.
Raw chicken litter, consisting mostly of manure with small amounts of beading straw was introduced into a stirred bed reactor containing stainless steel shot. The bed was maintained at 375 oC and the resulting vapors were condensed. The recovered liquid was separated through microwave solvent extraction and column chromatography; neutral compounds consisting predominately of hydrocarbons and related species were collected. Analysis of the compounds in the fuel by pyrolysis field ionization mass spectrometry (Py-FIMS) showed the presence of hydrocarbons, alcohols, fatty acids and alkyl-benzenes along with small quantities of other types of compounds.
Droplet evaporation tests were performed using the suspended droplet/moving furnace technique. A nitrogen atmosphere was used to suppress combustion and achieve pure evaporation. The evaporation of the droplet was modeled with a continuous thermodynamics droplet model used with considerable success for other complex biofuels. This required representing each significant chemical family in the fuel by a probability density function and devising suitable correlations for the thermal properties of each group.
The droplet evaporation model showed good agreement with the measured droplet evaporation rate and temperature; deviations observed were mostly caused by internal boiling of the droplet which the evaporation model does not take into account. The initial heating phase and evaporation which occurs after internal boiling ceases is in good agreement with the model.