Characterization and Combustion of Olive Pomace in a Fixed Bed Boiler: Effects of Particle Sizes

Abstract

The aim of this study is to characterize and burn out three olive pomace samples in a fixed bed boiler. These products are: raw olive pomace (R.O.P), exhausted olive pomace (E.O.P), and deoiled olive pomace (D.O.P). Before their combustion, they have been characterized using different analyses: proximate, ultimate, and thermogravimetric. So, proximate analysis illustrated that raw olive pomace contains volatile matter (74.2%), fixed carbon (20.2%), moisture (7.51%) and ash (2.8%). Next, ultimate analysis showed that R.O.P has important content percentages of carbon and oxygen (48.2% and 44.3% respectively). Furthermore, thermogravimetric analysis proved that the weight loss corresponding to the burnt volatile matter (VM) is ranging between 65% and 75% for all these biomasses. During the combustion of (R.O.P) and (E.O.P) samples, which is compared to that of wood sawdust, ignition propagation and char oxidation were observed. Moreover, effects of olive pomace particle size on temperature distributions at different combustor device positions were highlighted. The maximum temporal average temperature was reached with the smaller particles. Finally, the flue gas composition (O2, CO, CO2, NOx, SOx) has been measured and it has shown that the emissions of nitrogen oxides (NOx) are very low and sulphur oxides (SOx) are negligible.

Physicochemical Characterization and Kinetic Modeling Concerning Combustion of Waste Berry Pomace

“…The first zone was the drying and evaporation of water up to 150 °C. This is closely followed by phase two, the devolatilisation of hemicellulose and cellulose at 150-400 °C, while lignin was decomposed in phase three at 400-800 °C 31 .…”

“…This is closely followed by phase two, the devolatilization of hemicellulose and cellulose at 150−400 °C, while lignin was decomposed in phase three at 400−800 °C. 31 Similarly, the thermal degradation behavior of grape pomace in an inert atmosphere exhibited at temperatures below 130 °C, there was a slight loss of weight due to evaporation of moisture and volatilization of small organic molecules. Decomposition of hemicellulose occurred around 200 °C and reached the maximum weight loss rate at 273 °C.…”

Analysis of Fluid Flow and Heat Transfer inside a Batch Reactor for Hydrothermal Carbonization Process of a Biomass

“…This biomass, coming from a crushing unit located in Meknès region (Morocco), has an average particle size of 5 mm, and an initial humidity rate ranging between 30% and 40%. Also, it has been dried using an indirect forced convection solar dryer and then characterized [4,[21][22][23][24]. Table 1 summarizes ultimate and proximate analyses of the selected biomass.…”

“…The conversion of lignocellulosic biomass into biofuel is quite complex because it occurs following several parallel pathways whose mechanisms are still unclear. This transformation is usually performed by two main processes: the thermochemical and biochemical processes [1][2][3][4]. In this work, particular attention is paid to one of the most promising thermochemical processes, namely hydrothermal carbonization (HTC) which is a physico-chemical process for converting organic compounds into a valuable carbon material in the form of a hydrochar (a solid product) and other products (gases and aqueous phase).…”

Evaluation of the use of lignite of Turkeys’ with biomass as Agricultural waste as fuel in terms of emissions

“…M. Varol et al investigated the combustion of Bursa-Orhaneli lignite and 10%, 30%, and 50% wood chips mixtures with circulating fluidized bed combustor with excess air ratio varying between 1.05-2.43 [9]. M. A. Bennini et al examined the burning of raw olive pomace, exhausted olive pomace and deoiled olive pomace in a fixed bed boiler in their study [10]. A.…”