Assessing the emission factors of low-pour-fuel-oil and diesel in steam boilers

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

Modification of A Locally Made Electric Crop Dryer

Physic nut is a biomaterial that litters villages during the seasonal period which requires effective drying for oil and bio-fuel production. However, the natural method of drying and the existing dryer are found ineffective due to prolonged drying time leading to poor quality control. Processing of dried physic nut is required to ensure preservation, availability throughout the year, easy shelling and extraction. The main objectives of this study were to improve on the design of an existing electric crop dryer with a view to optimize its efficiency, reduce the drying time and produce hygienic and quality dried physic nuts. The improvements on the design of the existing dryer were achieved by increasing the throughput on the capacity by improving the material selection for the various key component parts. An adequate size of electrical heating element with thermo-sensor which regulates the drying temperature and a centrifugal fan to blow hot air from the heat supply unit to the drying chamber were installed in the dryer. The results of the improvements carried out on the design of this dryer show that maintenance cost is reduced, since the fan is the only moving part which may rarely be faulty, drying time of physic nut was reduced, operation of the dryer does not require any specialization, the dryer is safer to operate, the energy required for loading and unloading have reduced since the trays provided are removable. Higher production rate and quality of dried physic nuts are achieved because drying temperature and air velocity can be regulated. The throughput capacity, efficiency and drying capacity of the modified crop dryer are 20 kg/batch, 79.84 % and 0.73 kg/h, respectively. This dryer is recommended for medium and large scale processors and dried products can be used for further application. Keywords: physic nut, electric crop dryer, improvement on the existing design, temperature, drying  time

Effect of densification variables on water resistance of corn cob briquettes

ArticleSolid biofuels can be used in heat and power generation applications. The utilization of agricultural residues for this purpose would be of immense benefit to rural communities of developing countries where the resource is being produced. Water resistance is a crucial property for transport and storage of biomass briquettes under moist climate conditions. In this study, the effect of process and material variables on the water resistance property of corn cob briquettes was investigated. The water resistance of briquettes produced ranged between 32.6 and 94.8% for die temperature between 90 °C and 120 °C, hold time from 7.5 to 15 minutes and die pressures between 9 and 15 MPa. A higher die temperature resulted in an increase in the water resistance of the biomass briquettes. Also, increasing the hold time improved the water resistance of the briquettes. Using a particle size less than 2.5 mm resulted in higher briquette water resistance property compared to briquettes produced from particle sizes greater than 2.5 mm. It was also shown that the effect of the interaction of the temperature with particle size on the water resistance of corn cob briquettes was statistically significant (p < 0.05)

ENERGY USE EFFICIENCY OF MELON (COLOCYNTHIS CITRULLUS) PRODUCTION UNDER DIFFERENT TILLAGE METHODS

Since mechanization is inevitable and isassociated with increase in productivity, there is need to find the most appropriate tillage method in crop production that minimizes energy consumption, enhance profitability and reduce environmental damage from fossil fuel related emission. This research investigates the energy use efficiency in melon production in three tillage methods (reduced, minimum and maximum). Human power, machinery, diesel fuel, fertilizers, seed and pesticides energy inputs were used during the cultivation of melon. Input and output energy analysis method was used to quantify the input and output energy in each of the tillage methods during the production of melon. The energy indices of melon production determined are; energy efficiency, energy productivity, specific energy, net energy and energy efficiency index. The total energy required per hectare in reduced, minimum and maximum tillage were 4528.29, 7191.07 and 8325.64 MJ/ha while the output energy were found to be 8112, 10404 and 10752 MJ/ha, respectively. The energy efficiency were estimated to be 1.79, 1.45 and 1.29 while net energy were found to be 3583.71, 3212.93 and 2426.36 MJ/ha for reduced, minimum and maximum tillage methods, respectively. The result revealed that maximum tillage is better than both reduced and minimum tillage in terms of energy efficiency and net energy gain. Keywords: Energy, Melon, Tillage, Energy Efficiency, Net Energy DOI: 10.7176/JETP/11-4-03 Publication date: August  31st 202

Prediction of Density and Viscosity of Biodiesel Fuel from Fatty Acid Methyl Ester (FAME) Composition

Viscosity and density are important properties that qualify biodiesel fuel to serve as an alternative fuel because all other properties directly or indirectly depend on them. The processes involved in determining the viscosity and density of biodiesel are relatively simple and costly and there are discrepancies in the results obtained due to the differences in the oil composition of the feed-stocks used as against the reported cause of experimental errors. This work aimed at theoretically determining and developing relationship between the density and viscosity of different feed-stocks and the fatty acid methyl ester composition at different temperatures.In the study, density and viscosity data of biodiesel fuels and the composition of FAME were collected from literatures. &nbsp;A linear regression analysis was carried out for density and viscosity on the average values of viscosity and density data obtained at different temperatures range (10°C-40°C) of FAME composition. Equations relating density and viscosity with the percentage composition by weight of FAME of biodiesel fuel were developed. Predicted mean values for kinematic viscosity and density were respectively between 4.31 - 5.64 mm2/s and 861.67 – 885.66 kg/m3. The developed equations were able to predict with up to 97.1% accuracy for viscosity and 98.5% accuracy for density. The developed equations could effectively predict the quality of biodiesel (viscosity and density) from various feedstocks based on FAME compositions

Lecturers’ Assessment of Teaching Practice Exercise in Nigerian Universities

Teaching Practice is a crucial aspect of teacher education. Despite its importance, the programme is confronted with numerous challenges. Consequently, this paper examines the quality of teaching practice in Nigerian Universities from the perspective of education lecturers. Quality of Teaching Practice Questionnaire (QTPQ) was employed in obtaining data from 691 randomly selected education lecturers from the universities across the six geo-political zones in Nigeria. The data obtained were analysed using descriptive and inferential statistics. The study revealed that the respondents rated the quality of teaching practice exercise in Nigerian universities as fairly above average. It was also found that experience and job status had significant influence on the respondents’ assessment, while gender had no influence. Among others, it was recommended that more time should be allotted to teaching practice and re-training programmes should be organised for lecturers on the best practice in the internship aspect of teacher education. Key words: Assessment, Quality, Teaching Practice Exercise, Teacher Education

Development of an improved steamer for optimum retention of carotenoids in Attieke produced from biofortified cassava (Manihot esculenta Crantz) roots

Open Access ArticleAttiéké, made from biofortified (yellow) cassava genotypes, requires a new cooking method to minimize carotenoid degradation during processing. Thus, this research is aimed at designing and building a more efficient steamer to produce high-quality attiéké from biofortified cassava roots. Using three improved biofortified cassava genotypes (IBA141092, IBA070593, and IBA011368) obtained from IITA research farms, attiéké samples were produced using traditional and developed steamers. The results show that the developed steamer outperformed the traditional steamer; it was 1.5 times faster, used less fuel (2.6 times less), and had higher true carotenoid retention. The developed steamer genotype IBA070593 had the highest true retention of 90.4 percent, while the traditional steamer genotype IBA0141092 had the lowest carotenoid retention of 61.9 percent and the highest in the developed steamer (62.4 percent). When compared to the traditional steamer, the developed steamer had better cooking performance and a more extraordinary ability to retain carotenoids. Thus, the developed steamer is recommended for attiéké processors due to its improved cooking performance, and using this steamer to produce attiéké from biofortified cassava will help to alleviate vitamin A deficiency among attiéké consumers

The Energy Potentials of Some Agricultural Wastes as Local Fuel Materials in Nigeria

Rosana G. Moreira, Editor-in-Chief; Texas A&M UniversityThis is a paper from International Commission of Agricultural Engineering (CIGR, Commission Internationale du Genie Rural) E-Journal Volume 7 (2005): The Energy Potentials of Some Agricultural Wastes as Local Fuel Materials in Nigeria by Jekayinfa, S.O. and Omisakin, O.S