Browsing by Author "Oyewola, M. O."

Now showing 1 - 5 of 5

Combustion of 'as recieved' palm kernel shell in a bubbling fluidized bed combustor
(2012-07) Raji, T. O.; Oyewola, M. O.; Salau, T. A. O.
"Low cost and minimum emission of green house gases are two of the key advantages of using agricultural wastes as fuel in a bubbling fluidized bed combustor; however this advantage could be neutralized if significant cost and energy is spent on processing prior to usage of the waste, therefore if processing stage could be. circumvented without compromising effectiveness and efficiency, a substantial operational cost saving could be achieved when using biomass as fuel in a commercial scale bubbling fluidized bed combustor (BFBC). This research focus on use of 'as received' Palm kernel shell (PKS) in an experimental model bubbling fluidized bed combustor (BFBC). PKS feedstock received from the farm were cornbusted in several experiments in a 150mm diameter experimental model BFBC. The effect of large particle size feedstock of the 'as received'(4-22mm) on thermal profile and emission characteristics during the combustion process were examined. Operational chalienges such as fuel feeding, start-up and de-fluidization is examined and compare to situation when pulverized biomass is used. An electronic based inert bed temperature regulating unit ensure that the bed temperature is maintained at the pre-set value of 750°C in all the experiments. It was noted that combustion and emission characteristics with 'as received' PKS compare favourably with that of pulverized, however it was discovered that for specific feed rate( fd) and fluidizing air velocity.) the frequency at which the inert bed temperature regulating unit cut-off is higher for the 'as received'. The results indicate that PKS sample obtainable from Nigeria farms could be fired directly to generate energy in bubbling fluidized bed combustor. "
Development of an experimental model bubbling fluidized bed combustor for combustion of biomass
(2011-07) Raji, T. O.; Oyewola, M. O.; Salau, T. A. O.
Fuel flexibility and capacity to burn broad spectrum of fuels at high combustion efficiency with minimum emissions of greenhouse gases are few of several key advantages fluidized bed combustion technology has over other existing combustion technology. This report examines the design, development and testing of an experimental model Bubbling fluidized bed combustor (BFBC). The developed BFBC has unique inert bed's temperature regulating system which implies that the use of external source of cooling the inert bed such as embedded water cooled coil might be unnecessary. Fluidizing air pre-heater / Biomass feeding pipe's cooling attachment which attempt to prevent biomass from burning before entering the fluidized bed is another important feature of this BFBC. The Combustor body was fabricated from 150mm diameter, 2900mm tall type- 304 stainless steel pipes, divided into 5 modules. Coconut shell and Palm kernel shells were burnt successfully in the combustor. As a result of its numerous advantages over conventional combustion technology, Fluidized Bed Combustion (FBC) has been identified as a most viable means of generating renewable energy, therefore success with small BFBC like the one described here could be applied to building commercial size BFBC for power generation in Nigeria and Africa sub-region.
Effect of particle size on combustion of coconut shell in a bubbling fludized bed combustor
(2012) Raji, T. O.; Oyewola, M. O.; Salau, T. A. O.
"Combustion characteristics of coconut shell (CS) samples in an experimental model bubbling fluidized bed combustor (BFBC) was investigated with special focus on effect of particle size of the CS CS waste obtained from farm were crushed and classified into three sizes; Size X (12-50mm), SizeY (2-l2mm) and Size Z (<2mm). For overbed feeding of the feedstock, the impact of the particle size on emission and combustion performance were examined. in a 150mm diameter experimental model BFBC. Throughout the investigation inert bed temperature was fixed to a constant value of 750°C by means of electronic based inert bed temperature regulating unit (ITRU). Results showed that CS particle size have pronounced impact on combustion characteristics and the pollutants emission from the BFBC. It was observed that the Pollutants' emission was within acceptable limits for Size Y at about 310ppm for CO, <200PPM for NOx and almost zero for SOx. The results indicate that CS could be used as combustion feedstock for environmentally energy generation in a BFBC. "
New features for performance enhancment of experimental model bubbling fludized bed combustor.
(International Journal of Scienctific and Engineering Reasearch, 2012-01) Raji, T. O.; Oyewola, M. O.; Salau, T. A. O.
Fuel flexibility and capacity to burn broad spectrum of fuels at high combustion efficiency with minimum emissions of greenhouse gases are few of the key advantages fluidized bed combustion technology has over other existing combustion technology This report examines the design, development and testing of an experimental model Bubbling fluidized bed combustor. Three unique features to enhance performance of the system were suggested and comprehensively discussed; inert bed's temperature regulating unit, an integrated unit that enable Fluidizing air pre-heating as well as Biomass feeding pipe's cooling and segmentations of the Combustor body into modules /partitioning of these modules into lower and upper section. The results of the test run with Palm kernel shell and Coconut shell show that the system performance is enhanced and that the temperature is well regulated as observed in the thermal distribution. Its is therefore proposed that the present Bubbling Fluidized bed combustor could be beneficial to development of commercial sizes for power generation in Nigeria and Africa sub region.
Preliminary investigation of emission characteristics of shaving from three wood species utilized for furniture production in Ibadan, Oyo State
(International Commission of Agricultural and Biosystems Engineering, 2012) Adewole, N. A.; Oyewola, M. O.; Salau, T. A. O.; Bello, R. O.; Raji, T. O.
Carpentry workshop is among the prominent and active components of the Nigerian wood industrial sector. The activity in carpentry workshop inevitably generates different categories of wastes. Shavings is among the wood wastes generated in large quantity and the common means of disposing it in major town like Ibadan in Oyo State is by combusting. Large percentage often finds its way to household where it's often used to subsidize fuel for domestic cooking. However, this means of disposal may be prone to health hazard due to the emission released during its combustion. This work examines the combustion characteristics of three typical wood species that are commonly use for furniture production in Ibadan, Oyo state. The species were combusted in Bubbling Fluidized Bed (BFB) combustion under various operating conditions. The result shows that Carbon monoxide (CO) emission is pronounced in the combustion of all the wood species. In all the three cases, Milicia excelsa (Iroko) and Tectona grandis (Teak) have the lowest and highest CO emission respectively. It is suggested that if this waste must be used as fuel for domestic cooking, appropriate technology must be employed especially where low combustion temperature is desirable. However, proper disposition of this waste should be encouraged.