Showing papers by "Saroj Kumar Mohapatra published in 2013"

Biomass-based gasifiers for internal combustion (IC) engines—A review

Abstract: The world is facing severe problems of energy crisis and environmental problem. This situation makes people to focus their attention on sustainable energy resources for their survival. Biomass is recognized to be the major potential source for energy production. There are ranges of biomass utilization technologies that produce useful energy from biomass. Gasification is one of the important techniques out of direct combustion, anaerobic digestion – Biogas, ethanol production. Gasification enables conversion of these materials into combustible gas (producer gas), mechanical and electrical power, synthetic fuels, and chemical. The gasification of biomass into useful fuel enhances its potential as a renewable energy resource. This paper gives a comprehensive review of the techniques used for utilizing biomass, experimental investigation on biomass fuels, characterization, merits, demerits and challenges faced by biomass fuels.

Effect of addition of fly ash and drag reducing on the rheological properties of bottom ash

Abstract: Disposal of bottom ash is a major concern for thermal power plant operations. The objective of the present study was to investigate the possibility of disposal of bottom ash at higher solid concentrations. As rheology of the slurry plays a major role in flow, the rheological behavior of the bottom ash in the concentration range of 10-50% (by weight) has been studied with and without the addition of fly ash and an additive (sodium bicarbonate) to facilitate conveying bottom ash slurry at higher concentrations. Fly ash was added in five different proportions of the total ash concentration whereas the additive was added in four different concentrations for each concentration of bottom ash slurry. The behaviour of all the slurries was observed as Newtonian. Based on the experimental data, a correlation was developed to predict the relative viscosity of ash slurries as a function of total solids fly ash in the range of 10-40% (by weight) and, additive concentrations in the range of 2-8% (by weight).

Investigation on centrifugal slurry pump performance with variation of operating speed

Abstract: In this paper three-dimensional fluid flow behavior of centrifugal slurry pump has been studied using commercial Computational Fluid Dynamics (CFD) code FLUENT at design and off-design conditions. Steady state simulation with Moving Reference Frame (MRF) model is used to consider impeller-volute interaction. Different turbulence models namely, standard k- , RSM, k- and RNG k- are applied for simulation of flow through the pump, which show reasonably close prediction of head –flow characteristics of pump by kmodel. Performance characteristics of the pump is numerically predicted at four different operating speeds namely 1000 rpm, 1150 rpm, 1300 rpm and 1450 rpm with water. The numerical results are compared with the experimental measurements. The comparison indicates that the specific head, specific power and efficiency characteristics prediction are within an error band of 5 %. Simulation results showed that standard affinity relations are applicable to the slurry pump also.

Characterisation of biodiesel derived from waste cotton seed oil and waste mustard oil

Abstract: Biodiesel, an alternative fuel is derived from the fats of animals and plants. As energy demand increases and fossil fuels are limited, research is directed towards alternative renewable fuels. Properties of waste oil (cotton seed oil and mustard oil) have been compared with the properties of petrodiesel, showing a comparable regime for satisfactory optimized blend which is to be selected for the better performance of a C.I. engine with biodiesel. The work presented in this paper is the study of characteristics of biodiesel prepared from vegetable oils (waste cotton seed oil and waste mustard oil). The characteristics of biodiesel are to be checked at different blends(B10, B15, B20) and select the optimum blend based on these characteristics. The characteristics include free fatty acid value, density, viscosity, flash point and fire point, cloud point and pour point, carbon residue content and ash residue content.