oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
A Experimental Approach On Gasification Of Chicken Litter With Rice Husk  [PDF]
B.S.DAYANANDA, S H MANJUNATH, GIRISH K.B, L.K.SREEPATHI
International Journal of Innovative Research in Science, Engineering and Technology , 2013,
Abstract: In India, The Poultry Industry Is Growing At A Faster Rate. The Increase In The Demand For Chicken Meat And Eggs Has Led To The Faster Growth Of The Poultry Industry. Poultry Farms Are Largely Located In Rural Areas Which Face Scarcity Of Power. The Energy Requirements Of Poultry Farms Or The Poultry Industry Can Be Met By Utilizing The Energy Content Of The Chicken Litter Through Energy Conversion Technologies. The Fluidized Bed Gasification Technique Is Right Choice To Utilize Chicken Litter As Energy Source. In This Paper, A Discussion On Gasification Of Chicken Litter For Different Proportions Of Rice Husk Is Made And Was Found That The Blend Of 30% RH And 70% CL Was Found To Yield Best Quality Producer Gas.
Experimental Investigation of Thermal Characteristics of Kiwira Coal Waste with Rice Husk Blends for Gasification  [PDF]
Deodatus Kazawadi,Geoffrey R. John,Cecil K. King’ondu
Journal of Energy , 2014, DOI: 10.1155/2014/562382
Abstract: Eminent depletion of fossil fuels and environmental pollution are the key forces driving the implementation cofiring of fossil fuels and biomass. Cogasification as a technology is known to have advantages of low cost, high energy recovery, and environmental friendliness. The performance/efficiency of this energy recovery process substantially depends on thermal properties of the fuel. This paper presents experimental study of thermal behavior of Kiwira coal waste/rice husks blends. Compositions of 0, 20, 40, 60, 80, and 100% weight percentage rice husk were studied using thermogravimetric analyzer at the heating rate of 10?K/min to 1273?K. Specifically, degradation rate, conversion rate, and kinetic parameters have been studied. Thermal stability of coal waste was found to be higher than that of rice husks. In addition, thermal stability of coal waste/rice husk blend was found to decrease with an increase of rice husks. In contrast, both the degradation and devolatilization rates increased with the amount of rice husk. On the other hand, the activation energy dramatically reduced from 131?kJ/mol at 0% rice husks to 75?kJ/mol at 100% rice husks. The reduction of activation energy is advantageous as it can be used to design efficient performance and cost effective cogasification process. 1. Introduction The ever increasing need for clean energy, environmental protection, and alternative use of fossil fuel has necessitated the recovery of energy from waste fossil energy resources. Efficient ways to recover damped coal waste are on record and range from circulating fluidized bed combustor to gasification and pyrolysis [1]. Tanzania has approximately 1.5 billion metric tons of proven coal [2] with Kiwira coal mine having a proven deposit of 4 million metric tons [3]. It has an annual coal waste production of 17,374 tons [4] and has damped over 500,000 metric tons of waste for the 2 million metric tons of coal already mined. Although Tanzania has reasonably enough unutilized fresh coal, effective use of coal waste can provide sustainable profile of fossil fuel use. Tanzania has a wide range of biomass including forestry and agricultural residue. Rice husk in Tanzania is not used efficiently and as such most of it is wasted. For example, Mhilu estimated 326,220 tons of rice husks are wasted annually compared to 10,400 tons of coffee husks [5]. Direct combustion of coal waste has a wide range of constraints from environmental pollution, low energy recovery, and high cost [1]. Proven, cheap, and environmental friendly technologies such as
Basic design of a fluidized bed gasifier for rice husk on a pilot scale
Ramírez,J. J.; Martínez,J. D.; Petro,S. L.;
Latin American applied research , 2007,
Abstract: with the purpose of contributing to the energetic valuation of the solid wastes generated by the colombian agricultural industry, a practical methodology for the design of a fluidized bed gasifier for rice husk on pilot scale was developed. the gasifier equipment, made up of a reaction chamber of 0.3 m of internal diameter and 3 m of overall height, was designed from theoretical and experimental information available in the literature and from the past experiences of the research group. a design procedure was elaborated for each one of the seven parts or subsystems in which the gasifier equipment was divided, intending to produce an energetic gas with aproximately 70 kw of useful energetic power. experimental tests performed with a gasifier fabricated according to the designs showed that the developed procedure was adequate, with a maximum deviation close to 50% for the operational performance variables. therefore, the basic model developed in this work shows that it is helpful for preliminary prediction of the equivalence ratio, low heating value, volumetric yield, gas power and cold efficiency obtained in experimental atmospheric bubbling fluidized bed biomass gasification tests.
Basic design of a fluidized bed gasifier for rice husk on a pilot scale
J. J. Ramírez,J. D. Martínez,S. L. Petro
Latin American applied research , 2007,
Abstract: With the purpose of contributing to the energetic valuation of the solid wastes generated by the Colombian agricultural industry, a practical methodology for the design of a fluidized bed gasifier for rice husk on pilot scale was developed. The gasifier equipment, made up of a reaction chamber of 0.3 m of internal diameter and 3 m of overall height, was designed from theoretical and experimental information available in the literature and from the past experiences of the research group. A design procedure was elaborated for each one of the seven parts or subsystems in which the gasifier equipment was divided, intending to produce an energetic gas with aproximately 70 kW of useful energetic power. Experimental tests performed with a gasifier fabricated according to the designs showed that the developed procedure was adequate, with a maximum deviation close to 50% for the operational performance variables. Therefore, the basic model developed in this work shows that it is helpful for preliminary prediction of the equivalence ratio, low heating value, volumetric yield, gas power and cold efficiency obtained in experimental atmospheric bubbling fluidized bed biomass gasification tests.
The Study of Porous Aggregate Manufacture with the Black Ash from Gasification of Rice Husk  [PDF]
Jai-Houng Leu,K.S. Chou
Journal of Applied Sciences , 2011,
Abstract: This study aimed to propose the processing conditions and formula of making porous aggregates with the black ash, which is produced from gasification of rice husk and to provide a new environmental protection material for industry. The results indicated that higher thermal temperature results in fewer impurities in this black ash, as well as better SiO2 crystallization. Relatively, surface area reduced and water flow loss is decreased. The designed mixture of intensifier and binder added in the sintered porous aggregates can increase strength without causing great loss of surface areas. There is an optimal condition existing. The recommended components include kaolin, starch and this black ash, which ratio is 0.9:0.3:2 are treated by some dispersing agent (CaCO3 solution) for the uniformity of this mixture and sintered at 900°C, with less oxygen for this optimal process. The surface area of the aggregate is 105.88.88 m2 g-1, strength is 123.95 psia, and loss on water flow is 1.1277% in the optimal condition.
A novel vortex-fluidized bed combustor with two combustion chambers for rice-husk fuel
Madhiyanon, T.,Piriyarungroj, N.,Soponronnarit, S.
Songklanakarin Journal of Science and Technology , 2004,
Abstract: A novel vortexing-fluidized bed combustor (VFBC) using rice-husk as fuel was developed and presented. The combined characteristics of vortex combustion and fluidized bed combustion are the main features of the VFBC, which was designed to achieve high thermal capacity (MWth m-3), high thermal efficiency and low diameter to height ratio. The VFBC comprises a vertical cylinder chamber and a conical base, which provides a bed for incompletely combusted fuel. The overall dimensions are 1.10 m in height and 0.40 m in diameter. To evaluate combustor performance, the specific feed rate of fuel and mass flow rates of the primary, secondary, and tertiary air were varied independently of one another. The combustion appeared into two zones characterized by different combustion behaviors, i.e. 1) vortext combustion above the vortex ring and 2) fluidized bed combustion below the vortex ring. The fluidized bed zone has uniform temperature distributions across the cross-section of the combustor. The swirling of air above the vortex ringand the vortex ring itself played important roles in preventing the escape of combustion particulates. Bottomash appeared as fine black and grey particles of ash, which ranged in size from 200 to 600 μm. Fluidizationcould be initiated without the assistance of any inert material mixed into the bed. The experimental resultsindicated that thermal efficiency did not depend on the secondary or tertiary airflows, but was significantlyinfluenced by the excess air resulting from the combined total of the three airflows. The introduction of thetertiary airflow helped maintaining the temperature inside the combustor within acceptable levels. According to experimental conditions, i.e. a specific feed rate of 240 kg h-1m-3 and excess air (157%), it was found that the VFBC could achieve an exit gas temperature of 1060oC, thermal efficiency of 95%, and thermal capacity of 0.91 MWth m-3. The amounts of CO2, CO, and O2 gases emitted were directly related to thermal efficiency, and the amounts of CO and NOx were 50 and 380 ppm, respectively.
Utilization Of Rice Husk Ash  [PDF]
S. D. Nagrale
International Journal of Engineering Research and Applications , 2012,
Abstract: India is a major rice producing country, and the husk generated during milling is mostly used as a fuel in the boilers for processing paddy, producing energy through direct combustion and / or by gasification. About 20 million tones of Rice Husk Ash (RHA) is produced annually. This RHA is a great environment threat causing damage to the land and the surrounding area in which it is dumped. Lots of ways are being thought of for disposing them by making commercial use of this RHA. RHA can be used as a replacement for concrete (15 to 25%).This paper evaluates how different contents of Rice Husk Ash added to concrete may influence its physical and mechanical properties. Sample Cubes were tested with different percentage of RHA and different w/c ratio, replacing in mass the cement. Properties like Compressive strength, Water absorption and Slump retention were evaluated.
Characterization of Rice Husk for Cyclone Gasifier  [PDF]
I. Mohamad Yusof,N.A. Farid,Z.A. Zainal,M. Azman
Journal of Applied Sciences , 2008,
Abstract: The characterization of rice husk from local rice mills has been studied and evaluated to determine its potential utilization as a biomass fuel for a cyclone gasifier. The raw rice husk was pre-treated throughout a grinding process into smaller sizes of particles which is within a range of 0.4 to 1 mm and the sample of ground rice husk was analyzed for its fuel characteristics. The result of proximate analysis shows that the ground rice husk with size distribution within 0.4 to 1 mm contains 13.4% of fixed carbon, 62.95% of volatile matter and 18.5% of ash on dry basis. The moisture content of the sample was measured and determined as 10.4% (wet basis) and the calorific value was found to be approximately 14.8 MJ kg-1 with bulk density of 91.46 kg m-3. The result of ultimate analysis validates both ash and moisture content which are found to be 18.15 and 10.4%, respectively. Other elemental compositions determined by the ultimate analysis are carbon (37.9%), hydrogen (5.2%), nitrogen (0.14%), sulfur (0.61%) and oxygen (27.7% by difference). The study has identified that the fuel characteristics of the ground rice husk is comparable with other types of biomass and thus, making it another potential source of fuel for the cyclone gasification system.
Experimental Investigations of Extracted Rapeseed Combustion Emissions in a Small Scale Stationary Fluidized Bed Combustor  [PDF]
Nguyen Dinh Tung,Dieter Steinbrecht,Tristan Vincent
Energies , 2009, DOI: 10.3390/en20100057
Abstract: The objective of this study was to observe the combustion process of extracted rapeseed (ER) grist in a stationary fluidized bed combustor (SFBC) and evaluate the chemical compositions of the flue gas emissions. The experimental tests of ER combustion in the 90 to 200 kW (Kilowatt) SFB combustion test facility show that the optimal ER combustion temperature is within the range from 850 to 880° C. Temperature and the concentration of exhausted emissions (e.g. O 2, CO, CO 2, NO, NO 2, SO 2, C org) were measured with dedicated sensors distributed within the combustor, along its height and in the flue gas duct. The experimental results showed that with respect to German emission limits the concentration of SO 2 and NO x in the flue gas were high whereas that of CO was low. This study furthermore is applicable for the abundant biomass residue resources in Vietnam (rice husk, rice straw, bagasse, cassava residues, coconut shell etc.), which have similar chemical compositions to ER.
Investigation of Tribological Properties of Brake Pads by Using Rice Straw and Rice Husk Dust  [PDF]
Ibrahim Mutlu
Journal of Applied Sciences , 2009,
Abstract: In the present study, investigation of new materials to replace the asbestos has started to be considered. Brake pads used in automotive industry contain materials composed of more than ten different ingredients. In this study, the use of Rice Straw Dust (RSD) and Rice Husk Dust (RHD) has been investigated for assessing the tribological properties of brake pads. RSD and RHD both have silica in them which gives the pad materials a ceramic like behavior. To obtain RSD and RHD, rice straw and rice husk were grained after they have been dried. Different amounts of RSD and RHD were included in the brake pad mix along with the other regular ingredients. These newly formulated brake pads have been tested under Friction Assessment and Screening Test (FAST). Friction coefficient, wear rate and Scanning Electron Microscope (SEM) for friction surfaces were examined to assess the performance of these samples.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.