Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 34 for “"Calorific value"”.
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Hot Water Drying of Subbituminous Coal
… any significant influence on sodium removal. The calorific value of the coal also increased as a function of the drying temperature. The calorific value of the larger hot water dried particles increased from 6098 cal/g dry coal to 6514 cal/g dry coal (average calorific value of the original coal …
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Biomassa para geração de energia: eucalipto, cana-energia e bagaço de cana-de-açúcar
… characterization of loss of mass and heating value of each of the samples in the temperature range of 25-900 ° C (divided into four intervals). The samples were subjected to pretreatment consisting in chipping, followed by washing, drying and homogenization at 105 ° C for 24 hours. Later …
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Assessing technological feasibility of an on-shore circular-economy treatment plant for recycling ship-generated oily waste in Peru
… product was evaluated based on density, calorific value, and physicochemical properties, confirming its alignment with Peruvian technical standards for diesel-type fuel. Results showed a 24% recovery rate and an average calorific value comparable to conventional diesel. This research …
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Thermodynamic evaluation of the gasification of municipal solid waste
… have on the syngas composition, H2/CO ratio, and calorific value. The selection of the modelling approach focused on the problem statement. It was necessary to use a model that did not have a lot of limitations or relied on the geometry of the gasifier. A mathematical model that could analyse the …
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Coal resource characterization using the theory of coregionalized variables
… of estimation. Seam thickness, density, ash, calorific value, and sulphur have been studied to determine whether they are cross-correlated. Significant cross-correlations have been found to exist between ash content, density, and calorific value, where the rank of the coal is stable. A survey …
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Fluidised bed gasification of high-ash South African coals : an experimental and modelling study
… addition produces a significant increase in the calorific value of the gas (3.0 MJ/Nm3 to 5.5 MJ/Nm3). This observation has not previously been reported at pilot-plant scale. A mathematical model for a bubbling fluidised bed coal gasifier was developed based on sub-models for fluidised bed …
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Geology and characterization of coal at the Mushithe Coal Occurrence, Soutpansberg Coalfield, Limpopo Province, South Africa
… samples. Three samples were selected based on calorific value for maceral identification, mineral analyses and vitrinite reflectance using petrographic study. Detailed geological mapping of the area around the Mushithe coal occurrence showed the geological setting of coal in this area. The …
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Combining froth flotation and reflux classification to mitigate ARD generating potential of the Waterberg and Witbank coal ultrafines via sulfide removal
… of ultrafine slurries. These fines have a high calorific value, and contain sulfur minerals, particularly pyrite. The high calorific value of these discards leads to a waste of energy that could be harnessed and used, while the high sulfur content contributes to adverse environmental effects …
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A comparison of oral feeding and total parenteral nutrition in infants of very low birth mass
… 1972). The ideal quantity, content of nutrients, calorific value and mode of administration of feeds remains, at best, approximate. With the advent of Total Parenteral Nutrition (TPN) and the availability of relatively safe solutions of fats and amino-acids for intravenous use, interest has been …
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Using bio-chars as potential catalysts for upgrading wood pyrolysis vapors
… bio-oil moisture content and reducing its calorific value. Therefore, this project aims at understanding decomposition behavior of wood components, its chemical constituent polymers and using moderate catalysts, like bio-chars.;Thermo-chemical decomposition behavior for wood components …
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A process investigation of the biosolubilisation of low rank coal in slurry system
… a clean, cost-effective energy source or to value-added products. This can lead to increased utilisation of low-rank coal. Low-rank coal is currently under-utilised because of its low calorific value, high moisture and sulphur content. Most research on coal biosolubilisation has centred on …
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Studies on the composition and nutritional value of the cultivated mushroom, agaricus bisporus (Lange) Sing.
… ages. Fruitbodies were found to be of low calorific value but contained protein of high digestibility and quality, containing all the essential amino acids required by man. Quantitative estimates of the sulphur-containing amino acids indicated that fruitbodies were deficient in methionine …
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Compaction behavior, mechanical properties, and moisture resistance of torrefied and non-torrefied biomass pellets
… biomass is to increase the carbon content and calorific value, as well as reduce the hydrophilic nature of woody-biomass. To facilitate the handling and use of torrefied biomass, densification (e.g. pelletizing) is used to compact it into standard uniform shape pellets with high density and …
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Technical feasibility of using spent lubricating oil as a body fuel in traditional clay brick making operations
… waste. Among these, coal has the highest calorific value ranging between 22 to 29 MJ/kg. In South Africa coal is the most commonly used body fuel. The use of used lubricating oil as a body fuel has been reported, but the process has not been technically or scientifically studied. The …
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Microwave processing of lignocellulosic biomass for production of fuels
… It was shown possible to produce high calorific value chars at 150 oC lower than previously expected. A reduction of 100 oC was observed in the degradation temperature of hemicellulose. The technology is versatile, effective on a variety of biomass species, and has a favourable energy …
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Catalytic pyrolysis of agricultural residues for bio-oil production
… the rhizome had lower oxygen content, higher calorific value and better stability, thus indicating better quality than that produced from the stalk. The second objective was to improve the bio-oil properties in terms of heating value, viscosity and storage stability by the incorporation of …
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The potential of dissociated methanol as a fuel for spark ignition engines
… the dissociation reaction is not included in the calorific value of the fuel, then dissociated methanol offers a significant improvement in thermal efficiency compared to liquid methanol. Vaporised methanol offers efficiencies comparable to dissociated methanol for mixtures leaner than …
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Factors affecting the yields and properties of the products of the low-temperature carbonization of Penn-Lee coal fromm southwestern Virginia
… product, the bulk density of the char, or the calorific value of the char.
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Infusion cuisine: a study of the value of foods in a pottery context across the transition to agriculture in the southern Baltic
… a reflection of the economy, there were diverse values to food that contributed to the sequence that domesticates appear in the archaeological record, as well as the seeming rate and extent to which they were adopted. Although calorific value has received attention (Rowley-Conwy 1984), and …
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Lithostratigraphic and Geochemical Characterisation of the Waterberg Coalfield: Implications to Acid Mine Drainage, Limpopo Province, South Africa
… of abundance. Using both proximate analysis and calorific value (with mean value of 21.2 Mj/kg) coal was classified as below grade D. From the vitrinite reflectance value (ranging between 0.6 to 0.7), coal was ranked as medium-grade bituminous C. Paste pH and EC results indicated that the Sekoko …
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