Simeon Jekayinfa | Ladoke Akintola University of Technology (original) (raw)

Papers by Simeon Jekayinfa

A central composite design was used to analyze the effects of temperatures, air velocities and dr... more A central composite design was used to analyze the effects of temperatures, air velocities and drying time on energy analysis of drying process of physic nuts. The data obtained from the drying kinetics were fitted into energy equations to obtain the energy utilization (EU), energy utilization ratio (EUR) and heat transfer rate due to evaporation (Qevap). Response surface methodology was used to generate mathematical models for the energy responses and a quadratic polynomial equation was obtained for energy parameters by multiple regression analysis. Verification experiments confirmed the validity of the predicted model. The analysis of variance (ANOVA) depicted that the quadratic model was suitable for all responses. The predicted and experimental values of responses were in reasonable agreement with each other. An analysis of variance indicated that EU and EUR increased (p< 0.05) with the increasing in air temperature from 40 to 80 oC while Qevap decreased (p<0.05) with the ...

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ABSTRACT Biogas is a sustainable alternative for fossil fuels. It also provides a solution to bio... more ABSTRACT Biogas is a sustainable alternative for fossil fuels. It also provides a solution to bio wastes. This project deals with design, construction and testing of a bio-digester (plug flow digester), for the production of biogas using cow dung as substrate. The plug flow digester was designed and constructed to accommodate feedstock mainly cow dung in the absence of oxygen. Cow dung was mixed with water in ratio 1:2 respectively to facilitate quick breakdown and digestion of feedstock for biogas production. The mixture of cow dung and water was fed into the digester and biogas produced was collected into a gas bag for analysis. Gas produced was tested and analyzed at University of Ibadan research Laboratory to detect Methane (CH4), Carbon dioxide (CO2), Hydrogen Sulphide (H2S) and Oxygen (O2). From the analysis, the biogas produced contained methane gas (CH4) of 85.33%, carbon-dioxide (CO2) of 13.07%, Hydrogen Sulphide (H2S) of 1.56% and Oxygen (O2) of 0.04%

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Agriculture

The cultivation of fast-growing wood (e.g., poplar, willow or black locust) in short rotation cop... more The cultivation of fast-growing wood (e.g., poplar, willow or black locust) in short rotation coppices and agroforestry systems presents an opportunity for producing biomass sustainably in the agricultural sector. Cost-efficient agricultural wood production requires the availability of high-performance machinery and methods with which high-quality wood chips can be produced at low cost. It is known from harvesting short rotation coppices in practice that both the wood chip quality and the performance of the harvesting machinery depend on a variety of factors (e.g., harvesting method, weather conditions, tree species). That is why this study examines in detail the influence of the tree species (different varieties of poplar, willow, black locust) and the wood condition (fresh, stored or dried, frozen) on the specific energy demand for comminution in a stationary drum chipper and on the particle size distribution of the wood chips produced. For all the tree species examined, the chipp...

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Resources

Nigeria is a developing country with an insufficient supply of energy to meet the continuously gr... more Nigeria is a developing country with an insufficient supply of energy to meet the continuously growing demand. However, there are several biomass resources available within the country. This paper presents a desk review, which investigates the potential resources for biomass energy generation within the country. Energy policies to aid biomass use as an energy source within the country were also reviewed. Biomass resources identified within Nigeria include forest residues, agricultural residues, human and animal wastes, aquatic biomass, and energy crops. However, several of the resources, particularly agricultural residues, have competing uses, such as livestock feed and soil rejuvenation. An estimation of the technical energy potential of the biomass resources revealed that about 2.33 EJ could be generated from the available resources in Nigeria. Agricultural residues have an energy potential of about 1.09 EJ, with cassava, maize, oil palm, plantain, rice, and sorghum being the majo...

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Misr Journal of Agricultural Engineering

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Energy Sources, Part A: Recovery, Utilization, and Environmental Effects

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ABSTRACT Anaerobic digestion from batch digester containing varying ratio of mixture of cow slurr... more ABSTRACT Anaerobic digestion from batch digester containing varying ratio of mixture of cow slurry and maize stalk was studied at mesophilic temperature (37oC). Cattle slurry and maize stalks were co-digested at ratios 3:1, 1:1 and 1:3 using the percentage volatile solid of each substrate. The experiment was carried out in a laboratory scale batch digester. The digester was fed with cattle slurry-maize stalks mixtures calculated for the selected ratios based on the volatile solid (VS) concentration of the selected substrates. Co-digestion of cattle slurry with maize stalks at ratios 3:1, 1:1 and 3:1 at mesophilic temperature gave biogas yields of 0.426, 0.385 and 0.391m3/kgoDM respectively while the methane yields were 0.297, 0.270 and 0.262m3CH4/kgoDM respectively. From the fresh mass of the substrate, biogas yields of 0.052, 0.059 and 0.090 m3/kgFM were obtained for cattle slurry-maize stalks ratios of 3:1, 1:1 and 1:3 respectively while the methane yields from the fresh mass for the same ratios were 0.036, 0.043 and 0.060 CH4/kgFM respectively. Co-digestion of cattle slurry with maize stalks was found to have methane concentrations of 69.66, 70.24 and 66.98% at cattle slurry/maize stalks combinations of 3:1, 1:1 and 1:3 respectively. The highest biogas yields (oDM) of 0.426 m3/kgoDM was obtained at the mixing ratio of 3:1; therefore the mixing ratio of 3:1 is recommended as the optimal for the co-digestion of cattle slurry with maize stalks at mesophilic temperature.

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ABSTRACT

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... All the waste samples considered have heat values greater than some well-known biomass-fuels ... more ... All the waste samples considered have heat values greater than some well-known biomass-fuels and fall within the limit for the production of steam in ... As a result of this, it is envisaged that industries that use their waste biomass for energy would simultaneously solve a ...

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The purpose of this study is to examine the emissions effects resulting from the use of low pour ... more The purpose of this study is to examine the emissions effects resulting from the use of low pour fuel oil (LPFO) and diesel fuels in industrial steam boilers operation. The method of ultimate analysis of the products of combustion and emissions of pollutant analysis were used to estimate the annual rate of emissions of boilers. The results shows that the levels of uncontrolled boiler emissions on the environment can lead to increased greenhouse effects, global warming, and pollution and toxilogical impacts on human health. Only carbon monoxide emission was found to vary with the levels of oxygen generation in the products of combustion, while other substances were generally in relation to constituents and rates of consumption of fuel.

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This paper presents the design of a laboratory fire-tube steam boiler for eventual construction a... more This paper presents the design of a laboratory fire-tube steam boiler for eventual construction and use as a teaching aid and for research purposes. Thermodynamics, heat transfer and strength of materials analysis were conducted to estimate dimensions of parts and 3D modelling process was used to draft the working drawings of the steam boiler. Operational, dimensional, and thermodynamic details of designed steam boiler were determined. The working drawings of designed boiler are also presented. The design enables the availability of portable and affordable steam boilers for steam generation in school laboratories and to enhance research and students' learning process in areas of thermodynamics, heat transfer and energy studies

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International Journal of Product Lifecycle Management, 2013

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Nutrition & Food Science, 2008

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Nutrition & Food Science, 2005

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Nutrition & Food Science, 2004

... to the establishment of some cottage industries like those producing soap, cooking oil and bo... more ... to the establishment of some cottage industries like those producing soap, cooking oil and body/hair cream (Aina, 2002; Olajide and Oyelade ... Akinbami, JFK, Ilori, MO, Adeniyi, AA, Sanni, SA (2001), "Improving efficiency of energy use in Nigeria's industrial sector: a case study of ...

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Journal of Applied Science, Engineering and Technology, 2006

ABSTRACT Meterological data were collected from Ilorin and Ikeja in Nigeria to obtain relevant st... more ABSTRACT Meterological data were collected from Ilorin and Ikeja in Nigeria to obtain relevant statistics on the monthly mean maximum and minimum dry-bulb temperatures, as well as the average dry-bulb temperature during the coolest 15, 25 and 50 percent of the time, and during the warmest 50 percent of the time. The absolute humidities of the ambient air during these times were estimated from data collected on relative humidities and dew point. All these data were further used in calculating the energy requirements for the drying of grain. Also calculated are the power required to pump air through the grain and the periods required for drying. It is found, from a typical case study that the energy requirement for drying one tonne of grain with moisture content of 22% down to 12.6 percent (wet basis) is 54.0219kWh. The time required by the fan to carry out this drying process is 43.919 hours. The simulated data was compared with an experimental result and there was a reasonable agreement between the two thereby validating the simulation program.Journal of Applied Science, Engineering and Technology Vol. 3(1) 2003: 19-24

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Journal of Applied Science, Engineering and Technology, 2006

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Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2013

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A central composite design was used to analyze the effects of temperatures, air velocities and dr... more A central composite design was used to analyze the effects of temperatures, air velocities and drying time on energy analysis of drying process of physic nuts. The data obtained from the drying kinetics were fitted into energy equations to obtain the energy utilization (EU), energy utilization ratio (EUR) and heat transfer rate due to evaporation (Qevap). Response surface methodology was used to generate mathematical models for the energy responses and a quadratic polynomial equation was obtained for energy parameters by multiple regression analysis. Verification experiments confirmed the validity of the predicted model. The analysis of variance (ANOVA) depicted that the quadratic model was suitable for all responses. The predicted and experimental values of responses were in reasonable agreement with each other. An analysis of variance indicated that EU and EUR increased (p< 0.05) with the increasing in air temperature from 40 to 80 oC while Qevap decreased (p<0.05) with the ...

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ABSTRACT Biogas is a sustainable alternative for fossil fuels. It also provides a solution to bio... more ABSTRACT Biogas is a sustainable alternative for fossil fuels. It also provides a solution to bio wastes. This project deals with design, construction and testing of a bio-digester (plug flow digester), for the production of biogas using cow dung as substrate. The plug flow digester was designed and constructed to accommodate feedstock mainly cow dung in the absence of oxygen. Cow dung was mixed with water in ratio 1:2 respectively to facilitate quick breakdown and digestion of feedstock for biogas production. The mixture of cow dung and water was fed into the digester and biogas produced was collected into a gas bag for analysis. Gas produced was tested and analyzed at University of Ibadan research Laboratory to detect Methane (CH4), Carbon dioxide (CO2), Hydrogen Sulphide (H2S) and Oxygen (O2). From the analysis, the biogas produced contained methane gas (CH4) of 85.33%, carbon-dioxide (CO2) of 13.07%, Hydrogen Sulphide (H2S) of 1.56% and Oxygen (O2) of 0.04%

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Agriculture

The cultivation of fast-growing wood (e.g., poplar, willow or black locust) in short rotation cop... more The cultivation of fast-growing wood (e.g., poplar, willow or black locust) in short rotation coppices and agroforestry systems presents an opportunity for producing biomass sustainably in the agricultural sector. Cost-efficient agricultural wood production requires the availability of high-performance machinery and methods with which high-quality wood chips can be produced at low cost. It is known from harvesting short rotation coppices in practice that both the wood chip quality and the performance of the harvesting machinery depend on a variety of factors (e.g., harvesting method, weather conditions, tree species). That is why this study examines in detail the influence of the tree species (different varieties of poplar, willow, black locust) and the wood condition (fresh, stored or dried, frozen) on the specific energy demand for comminution in a stationary drum chipper and on the particle size distribution of the wood chips produced. For all the tree species examined, the chipp...

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Resources

Nigeria is a developing country with an insufficient supply of energy to meet the continuously gr... more Nigeria is a developing country with an insufficient supply of energy to meet the continuously growing demand. However, there are several biomass resources available within the country. This paper presents a desk review, which investigates the potential resources for biomass energy generation within the country. Energy policies to aid biomass use as an energy source within the country were also reviewed. Biomass resources identified within Nigeria include forest residues, agricultural residues, human and animal wastes, aquatic biomass, and energy crops. However, several of the resources, particularly agricultural residues, have competing uses, such as livestock feed and soil rejuvenation. An estimation of the technical energy potential of the biomass resources revealed that about 2.33 EJ could be generated from the available resources in Nigeria. Agricultural residues have an energy potential of about 1.09 EJ, with cassava, maize, oil palm, plantain, rice, and sorghum being the majo...

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Misr Journal of Agricultural Engineering

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Energy Sources, Part A: Recovery, Utilization, and Environmental Effects

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Bookmarks Related papers MentionsView impact

Bookmarks Related papers MentionsView impact

ABSTRACT Anaerobic digestion from batch digester containing varying ratio of mixture of cow slurr... more ABSTRACT Anaerobic digestion from batch digester containing varying ratio of mixture of cow slurry and maize stalk was studied at mesophilic temperature (37oC). Cattle slurry and maize stalks were co-digested at ratios 3:1, 1:1 and 1:3 using the percentage volatile solid of each substrate. The experiment was carried out in a laboratory scale batch digester. The digester was fed with cattle slurry-maize stalks mixtures calculated for the selected ratios based on the volatile solid (VS) concentration of the selected substrates. Co-digestion of cattle slurry with maize stalks at ratios 3:1, 1:1 and 3:1 at mesophilic temperature gave biogas yields of 0.426, 0.385 and 0.391m3/kgoDM respectively while the methane yields were 0.297, 0.270 and 0.262m3CH4/kgoDM respectively. From the fresh mass of the substrate, biogas yields of 0.052, 0.059 and 0.090 m3/kgFM were obtained for cattle slurry-maize stalks ratios of 3:1, 1:1 and 1:3 respectively while the methane yields from the fresh mass for the same ratios were 0.036, 0.043 and 0.060 CH4/kgFM respectively. Co-digestion of cattle slurry with maize stalks was found to have methane concentrations of 69.66, 70.24 and 66.98% at cattle slurry/maize stalks combinations of 3:1, 1:1 and 1:3 respectively. The highest biogas yields (oDM) of 0.426 m3/kgoDM was obtained at the mixing ratio of 3:1; therefore the mixing ratio of 3:1 is recommended as the optimal for the co-digestion of cattle slurry with maize stalks at mesophilic temperature.

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ABSTRACT

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... All the waste samples considered have heat values greater than some well-known biomass-fuels ... more ... All the waste samples considered have heat values greater than some well-known biomass-fuels and fall within the limit for the production of steam in ... As a result of this, it is envisaged that industries that use their waste biomass for energy would simultaneously solve a ...

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The purpose of this study is to examine the emissions effects resulting from the use of low pour ... more The purpose of this study is to examine the emissions effects resulting from the use of low pour fuel oil (LPFO) and diesel fuels in industrial steam boilers operation. The method of ultimate analysis of the products of combustion and emissions of pollutant analysis were used to estimate the annual rate of emissions of boilers. The results shows that the levels of uncontrolled boiler emissions on the environment can lead to increased greenhouse effects, global warming, and pollution and toxilogical impacts on human health. Only carbon monoxide emission was found to vary with the levels of oxygen generation in the products of combustion, while other substances were generally in relation to constituents and rates of consumption of fuel.

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This paper presents the design of a laboratory fire-tube steam boiler for eventual construction a... more This paper presents the design of a laboratory fire-tube steam boiler for eventual construction and use as a teaching aid and for research purposes. Thermodynamics, heat transfer and strength of materials analysis were conducted to estimate dimensions of parts and 3D modelling process was used to draft the working drawings of the steam boiler. Operational, dimensional, and thermodynamic details of designed steam boiler were determined. The working drawings of designed boiler are also presented. The design enables the availability of portable and affordable steam boilers for steam generation in school laboratories and to enhance research and students' learning process in areas of thermodynamics, heat transfer and energy studies

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International Journal of Product Lifecycle Management, 2013

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Nutrition & Food Science, 2008

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Nutrition & Food Science, 2005

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Nutrition & Food Science, 2004

... to the establishment of some cottage industries like those producing soap, cooking oil and bo... more ... to the establishment of some cottage industries like those producing soap, cooking oil and body/hair cream (Aina, 2002; Olajide and Oyelade ... Akinbami, JFK, Ilori, MO, Adeniyi, AA, Sanni, SA (2001), "Improving efficiency of energy use in Nigeria's industrial sector: a case study of ...

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Journal of Applied Science, Engineering and Technology, 2006

ABSTRACT Meterological data were collected from Ilorin and Ikeja in Nigeria to obtain relevant st... more ABSTRACT Meterological data were collected from Ilorin and Ikeja in Nigeria to obtain relevant statistics on the monthly mean maximum and minimum dry-bulb temperatures, as well as the average dry-bulb temperature during the coolest 15, 25 and 50 percent of the time, and during the warmest 50 percent of the time. The absolute humidities of the ambient air during these times were estimated from data collected on relative humidities and dew point. All these data were further used in calculating the energy requirements for the drying of grain. Also calculated are the power required to pump air through the grain and the periods required for drying. It is found, from a typical case study that the energy requirement for drying one tonne of grain with moisture content of 22% down to 12.6 percent (wet basis) is 54.0219kWh. The time required by the fan to carry out this drying process is 43.919 hours. The simulated data was compared with an experimental result and there was a reasonable agreement between the two thereby validating the simulation program.Journal of Applied Science, Engineering and Technology Vol. 3(1) 2003: 19-24

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Journal of Applied Science, Engineering and Technology, 2006

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Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2013

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