ENCIT2012-003 KINETIC MODELING OF ENERGY SEPARATION PROCESS INTO A RANQUE-HILSCH VORTEX TUBE - PDF
George Stanescu, UFPA, Brazil
Abstract: Simultaneously producing heating and cooling, the Vortex tube is a simple, no moving components, small and lightweight, low cost, easy-to-operate and maintenance free device for gas expansion. In connection with the tremendous necessity for new ecological technologies, the aim of this paper is to present a new approach for understanding the Ranque-Hilsch Vortex Tube green refrigeration effect.
Keywords:Ranque-Hilsch Vortex Tube; green refrigeration.
Presentation Schedule: Wednesday, 15:20-15:40. Session: ETS3-3. Presenter: George Stanescu.
ENCIT2012-185 AN OVERVIEW OF DIFFERENT TURBULENCE MODELS APPLIED IN A FLOW WITHIN A 4-STAGES AXIAL-FLOW COMPRESSOR - PDF
Diego Thomas da Silva, Jesuino Takachi Tomita, ITA, Brazil
Abstract: The flowfield calculation in axial flow turbomachines using CFD is not trivial, requiring special numerical schemes and methods to reach the numerical convergence. One big issue in computational simulation, is the mathematical representation of the turbulence effects, the turbulence modeling. The literature is scarced of detalied studies about the influence of turbulence models in CFD simulation of multi-stage axial flow turbomachines. The present investigation estimate the influence of four different turbulence models apllied in a flowfield determination of a high pressure compressor. In this work, the well-known one-equation turbulence model, vastly applied in aerodynamics, developed by Spalart and Allmaras, two equations standard k-\&\#1013; model developed by Jones amd Launder,the two equations k-\&\#969; model developed by Wilcox and largely used in aerospace aplications and the two equations turbulence model developed by Menter called SST were performed to compare its results in the case of a multistage axial compressor flow calculations. Fluid properties contours, distribuitons and graphics were plotted to show the differences captured in flow proprierties by each turbulence model. Recommendations about best practice in axial flow turbomachine are discussed.
Keywords:Turbomachinery, High Pressure Compressor, CFD, Turbulence Modeling, Gas Turbines.
Presentation Schedule: Wednesday, 14:20-14:40. Session: ETS3-3. Presenter: Márcio Teixeira de Mendonça.
ENCIT2012-020 THERMODYNAMIC MODELING OF ENERGY SEPARATION PROCESS INTO A RANQUE-HILSCH VORTEX TUBE - PDF
George Stanescu, UFPR, Brazil
Luiz Alberto Oliveira Rocha, UFRGS, Brazil
Abstract: The Ranque-Hilsch Vortex Tube is a simple, no moving components, small and lightweight, low cost, easy-to-operate and maintenance free device for gas expansion to simultaneously produce heating and cooling. This paper presents a thermodynamic model for the Vortex Tube steady state functioning and evaluates its potential for green heating or green cooling.
Keywords:Ranque-Hilsch Vortex Tube; green refrigeration.
Presentation Schedule: Monday, 15:20-15:40. Session: ETS3-1. Presenter: George Stanescu.
ENCIT2012-084 THERMODYNAMICAL ANALYSIS APPLIED TO SUPERCONDUCTING DC CABLE MODEL - PDF
Celso Luiz Buiar, IFPR, Brazil
José Viriato Coelho Vargas, UFPR, Brazil
Abstract: The recent increase in distributed power generation is highlighting the demand to investigate and implement better and more efficient power distribution grids. High-temperature superconducting transmission cables have the potential to address the need for more efficient transmission and their usage is expected to increase in the future. Thermal modeling of HTS DC cables is a critical tool to have in order to better understand and characterize the operation of such transmission lines. A physical model, based in thermo dynamical analysis, combination first thermodynamics law and momentum equation, writing the properties as temperature function in all elements, dividing the problem domain in n small volumes, generated a 10 x n and 2 x n differentials equations to temperature and pressure solved for Runge - Kutta 4Th order method, discretized in space and referenced as Volume Element Model, (VEM).As a result, the temperature and pressure profiles are determined along a superconducting cable, useful tool for simulation, design, and optimization of HTS DC transmission cables.
Keywords:Thermodynamic analysis; Superconducting DC Cables; Element Volume Method.
Presentation Schedule: Wednesday, 14:40-15:00. Session: ETS3-3. Presenter: Celso Luiz Buiar.
ENCIT2012-161 A PROPOSED THEORETICAL STANDARD CYCLE FOR A RECIPROCATING STEAM ENGINE - PDF
Rodrigo Bernardello, José R. Simões-Moreira, USP, Brazil
Abstract: The reciprocating steam machine played an important role in the industrial revolution and it was widely used in many sectors of industry. But with the development of the internal combustion engines and steam turbines, this technology was virtually abandoned. Nowadays the interest in steam machine began to grow again, due to the growth of distributed generation of eletricity. This type of power generation usually uses the organic Rankine cycle (ORC) to generate low power, making the steam machine viable when compared to the steam turbines. In the literature, each author uses a different cycle to study or design his equipment, so it is interesting to study a single standard cycle for the reciprocating steam engines to serve as standard for comparing cycles already studied. The results show that there are maximum operational points, which depend in some conditions and constructive features.
Keywords:Steam machine; Rankine Cycle; Standard cycle.
Presentation Schedule: Monday, 18:00-18:20. Session: ETS3-2. Presenter: Rodrigo Bernardello Unzueta.
ENCIT2012-194 ENERGETIC ANALYSIS OF OXYGEN-ENHANCED COMBUSTION WITH AIR SEPARATION BY POLYMERIC MEMBRANES - PDF
Cristiano Frandalozo Maidana, Paulo Smith Schneider, UFRGS, Brazil
Abstract: This paper presents a study of oxygen enhanced combustion process where the oxidant stream is obtained after air separation by a membrane device. A theoretical analysis is performed over a generic combustion chamber coupled to a system of compression, cooling and separation air. The oxygen concentration is ranged from 21\% up to 30\% in volume, process known as oxygen enhanced combustion, keeping the equivalence ratio constant. The oxygen enhanced stream is obtained is obtained from a polymeric membrane, capable to deliver an oxidizer with different O2/N2 concentrations and with flow rates according to the operational feeding required by combustion chamber. Three permselectivities types were chosen for the analysis of membrane properties effect on operational conditions of the system. The energy balance of the coupled system displays an increase about 3 times in available energy when compared to the standard case (21\% O2 in the oxidizer by volume). It is also observed that the greatest amount of energy release is obtained by the poly(4-methyl-1-pentene)- TPX membrane.
Keywords:oxygen-enhanced combustion; polymeric membranes; gas separation.
Presentation Schedule: Wednesday, 15:00-15:20. Session: ETS3-3. Presenter: Cristiano Frandalozo Maidana.
ENCIT2012-120 A METHODOLOGY FOR TRASIENT BEHAVIOUR ANALYSIS OF HORIZONTAL AXIS WIND TURBINE. - PDF
Sergio Andres Jaimes Rueda, Jerson Rogério Pinheiro Vaz, Amarante Mesquita André Luiz, UFPA, Brazil
Abstract: This work aims to present a simplified mathematical model for analyzing of wind turbine performance operating at variable speed, considering the coupling between rotor and electrical generator, taking into account the inertial characteristics of the wind turbine components. Therefore, in this work, is presented a methodology applied to the horizontal axis wind turbine design in a non-stationary regime, using the Blade Element Momentum (BEM). The results are compared with other model in the literature, showing good agreement.
Keywords:Variable Speed Wind Turbine; Horizontal Axis Wind Turbine; Blade Element Momentum.
Presentation Schedule: NO PRESENTATION.
ENCIT2012-277 NATURAL GAS COGENERATION PLANT FOR AN AUTOMOTIVE INDUSTRY IN BRAZIL - PDF
José Alexandre Matelli, Daniel Hagestedt Ferreira, UNESP, Brazil
Abstract: The search for energy efficiency improvement is a common concern in many companies. Cogeneration is a well known energy conservation technique. In Brazil, biomass cogeneration plants are widely spread; on the other hand, natural gas plants are not so common, specially in the industrial sector. In this work, a preliminary technical and economic study is carried out for a cogeneration plant application in an automotive industry located in São Paulo. Three 2435 kW generator sets based on reciprocating internal combustion engines are selected to generate power. The heat associated to the engines exhaust gases are recovered to generate steam. When compared to the current status (no cogeneration), annual savings of about 2,3 MR\$ are expected, resulting in an almost 3 years payback.
Keywords:Cogeneration; Natural gas; Automotive industry; Internal combustion engine.
Presentation Schedule: Monday, 16:00-16:20. Session: ETS3-1. Presenter: José Alexandre Matelli.
ENCIT2012-091 DESIGN OF MODIFIED THROTTLING CALORIMETER FOR LOW STEAM QUALITY MEASUREMENTS - PDF
Alan Rabelo de Souza Moura, Hussein Felix Gazel, Manoel Fernandes Martins Nogueira, UFPA, Brazil
Abstract: On the Amazon, the Pará state stands out as the one who has more intensively utilized its bases of timber. One alternative for more efficient waste use is its combustion in cyclone boilers, converting chemical energy into power or process steam. The accurate measurement of this steam energy plays a key role on the enterprise energy management. On this scenario, the project developed by the group Energy, Biomass and Environment, EBMA, at Mechanical Engineering School, UFPA, made possible the construction of a cyclonic combustion boiler at laboratory scale and producing wet steam at low pressure (8 kgf/cm$^2$). To determine the efficiency of the boiler using the direct method demands to know the produced steam enthalpy. Since the boiler does not possess super-heater, evaluation of the steam quality is required to quantify steam enthalpy. A technique for doing this involves the throttling calorimeter. However, they are not effective for low steam quality values like the ones expected for the EBMA boiler. The effectiveness of this device is limited by the throttling capacity to convert the mixture liquid-vapor in superheated steam. In this context, a modified throttling calorimeter was developed capable to determine low values of steam quality. In this device, electric heaters adds heat to the stream in a controlled flux and the stream velocity which passes through it is measured using the thermal mass flow meter operating principles. For the sizing of the throttling and the heaters, a steam flow analyses was made based on forecasts for the boiler steam quality. For this device was developed an appropriate instrumentation, which allowed the computer assisted instantaneous steam quality measurement. This device can be used in any range of steam quality, by adding the appropriate amount of heat to the steam and has an uncertainty of 7\%.
Keywords:throttling calorimeter; steam quality; cyclone boilers; instrumentation.
Presentation Schedule: Wednesday, 16:40-17:00. Session: ETS3-3. Presenter: Alan Rabelo de Souza Moura.
ENCIT2012-107 ROBUST APPROACH FOR SHELL AND TUBE EXCHANGERS OPTIMIZATION UNDER UNCERTAIN HEAT TRANSFER ESTIMATION - PDF
Antonio C. Caputo, University of Roma, Italy
Pacifico M. Pelagagge, Paolo Salini, University of L'Aquila, Italy
Abstract: In this paper a procedure for optimal design of shell and tube heat exchangers considering uncertainties in the estimation of heat transfer coefficients is proposed. The methodology adopts a genetic algorithm to determine the best equipment architecture and design parameters in order to design a robust exchanger, i.e. to minimize the sensitivity of equipment performance to variations in the actual value of the overall heat transfer coefficient, or to optimize a user-defined objective function including capital investment, operating costs, value of the transferred heat, and penalties for unmet specifications, subject to random variations of the actual heat transfer coefficient according to predetermined probability density functions. The performance improvement obtained when passing from deterministic to uncertain design environment are then demonstrated resorting to some numerical examples.
Keywords:Heat exchanger design; Genetic algorithm; Optimization; Uncertainty.
Presentation Schedule: Monday, 18:20-18:40. Session: ETS3-2. Presenter: Pacifico M. Pelagagge.
ENCIT2012-123 MATHEMATICAL MODELING AND SIMULATION OF A HEAT PUMP WATER DESALINATION PROCESS - PDF
Paul Fernand Milcent, José Viriato Coelho Vargas, UFPR, Brazil
Abstract: Numerous communities in Brazil show a lack of drinking water. There are many resources available for its purification. It is clear that the technological mastery of each alternative is a strategic issue for Brazil. The aim of this paper is the modeling a system for obtaining pure water from brackish or sea water through a heat pump, with mechanical compression of an auxiliary fluid. There were employed the techniques of material and energy balances, coupled with thermodynamic predictions and analysis. A system where the heat exchangers for preheating the supply is independent from the compression cycle was studied, operating thanks to the final cooling of de product and the waste of the process. The auxiliary fluid is considered pure water. Two concentrations were considered for the saline aqueous solution, 0.002 Kg / Kg and 0.034 Kg / Kg, respectively simulating the brackish water unfit for human consumption and sea water. The different simulations resulted on energy consumption for desalination between 10.3 and 30.4 KWh/m3 of pure water produced. For brackish water, it were simulated yields (product flow / feed flow rate) as high as 98\%.
Keywords:Desalination; sea water; brackish water; heat pump; evaporation.
Presentation Schedule: Monday, 17:00-17:20. Session: ETS3-2. Presenter: Paul Fernand Milcent.
ENCIT2012-152 DEVELOPMENT OF A CABINET BASED ON FUEL CELL TECHNOLOGY AND SOLAR ENERGY - PDF
Felipe Leonardo de Moura Merss, Fernando Augusto Lopes Corrêa, José Viriato Coelho Vargas, Elise Meister Sommer, UFPR, Brazil
Abstract: In recent years, there has been intensive research on clean and renewable energy production. Two main reasons have been pointed out: pollution caused by oil fuels consumption and their depletion, which increases their production costs. Fuel Cells have shown to be a clean and renewable energy source, which turns them into a promising solution, although technology hurdles still need to be overcome. Fuel Cells produce electricity, water and heat consuming hydrogen and pure oxygen or air. This prototype combines different components to produce a self-sustainable fuel cells technology based cabinet for energy production, which is a Regenerative Fuel Cell System (RFC) with the potential for space applications. The system contains: a photovoltaic panel, a charge controller, 4 batteries, a DC/AC current inverter, a fuel cell stack and a hydrogen storage bottle. The photovoltaic panel charges the batteries, while the charge controller controls the batteries loading. Batteries are connected to a DC/AC inverter. The inverter is connected to the Fuel Cell control system, which controls the hydrogen consumption in order to produce the necessary output power. The system proved to be efficient and capable to use to renewable energy sources (solar and fuel cell technology) in a cabinet. It is also possible to transform this prototype into a sustainable system just installing an Electrolyser, which will produce the hydrogen required to run the fuel cell stack.
Keywords:regenerative fuel cells; solar panel; solar driven cabinet.
Presentation Schedule: Wednesday, 16:20-16:40. Session: ETS3-3. Presenter: José Viriato Coelho Vargas.
ENCIT2012-215 COMPARISON OF TECHNOLOGIES FOR THE BEST CHOICE OF A LARGE POWER ELECTRIC GENERATING PLANT BASED ON THERMOELECTRIC WITH COAL OR URANIUM - PDF
Dagoberto Cássio Silva, CEFET-MG, Brazil
Mariana Natale Belato, Rogério José da Silva, FEI, Brazil
Abstract: Between the alternative sources available for the production of electricity, still lacks reliability for the production in large-scale facilities for base units. For the production of electricity from 500 MW to 1000 MW or more, the coal-fired thermal power plants and nuclear power plants with uranium as fuel have proved competitive and with a high level of reliability and maturation, besides presenting the fuel supply security. This paper presents an analysis of technical feasibility for the choice of the best technology for generating electricity on a large scale, with reliability, based on coal-fired thermal power plants or nuclear power plant using uranium. This paper takes in account the availability of fuel sources, investments costs, thermal power generation systems (boilers and reactors), pollutants emission and mitigation technologies, global efficiency, fuel consumption, CO2 emissions informations of the main electricity generation technologies, CO2 sequestration possibilities, costs of electricity generated, average construction time and average lifespan of the installation. Thus the analysis allows the most rational choice of technology for the production of electricity with less environmental impacts, increased security and with the best global efficiency for the production of electricity on a large scale and lower CO2 emissions.
Keywords:Energy; Coal; Uranium; Power Plants.
Presentation Schedule: Monday, 15:40-16:00. Session: ETS3-1. Presenter: Mariana Natale Belato.
ENCIT2012-250 PARAMETRIC ANALYSIS OF AN ALKALINE MEMBRANE FUEL CELL - PDF
Lauber de Souza Martins, Florida State University, United States
Elise Meister Sommer, UFPR, Brazil
Juan Carlos Ordonez, Florida State University, United States
José Viriato Coelho Vargas, UFPR, Brazil
Abstract: The mathematical model developed and experimentally validated on previous works for the Alkaline Membrane Fuel Cell (AMFC) can be used to simulate the fuel cell performance as a function of different parameters. The resulting equations from the mathematical model were solved with a Fortran code using a quasi-Newton method. The influence of important design parameters as the porosity of the reactive layer of electrodes and of the membrane and operational parameters (temperature of the feeding gases) on the AMFC power output is studied and discussed in this paper. These results can be used as future tool for power optimization.
Keywords:Alkaline Membrane Fuel Cell; Numerical Simulation; Parametric Analysis.
Presentation Schedule: Wednesday, 15:40-16:00. Session: ETS3-3. Presenter: Elise Meister Sommer.
ENCIT2012-034 COMPARED EXERGY ANALYSIS OF CELLULOSE HYDROLYSIS ROUTES - PDF
Roberto Fiedler Rossi, Pablo Silva Ortiz, Silvio de Oliveira Junior, USP, Brazil
Abstract: The comparison of hydrolysis routes (acid and enzymatic) has become an important issue nowadays, being a part of ethanol production routes by renewable sources. This paper uses exergy as a tool to compare five hydrolysis routes and define, from a thermodynamic point of view, the most efficient one. The reactor analyzed involves pure hydrolysis of cellulose: cellulose into glucose. Results show that enzymatic hydrolysis is equivalent to concentrated acid hydrolysis when both use equivalent saccharification efficiencies, with 60.1-61.6\% exergy efficiency for enzymatic hydrolysis, 59.2-60.7\% for concentrated acid hydrolysis, superior than diluted acid one, with 47.8\% exergy efficiency, indicating that saccharification efficiency is a relevant parameter in hydrolysis processes efficiencies.
Keywords:exergy; biomass; enzymatic hydrolysis; concentrated acid hydrolysis; dilute acid hydrolysis.
Presentation Schedule: Monday, 17:40-18:00. Session: ETS3-2. Presenter: Roberto Fiedler Rossi.
ENCIT2012-335 RELATIONSHIP BETWEEN SPEED OF SOLIDIFICATION [VL] AND MAGNESIUM CONTENT IN AL-MG-SI ALLOYS UNIDIRECTIONALLY SOLIDIFIED - PDF
Johnyson Feitosa, Pedro Henrique Lamarão, Washington Santos, José Maria do Vale Quaresma, UFPA, Brazil
Abstract: This paper aims to establish experimental relationships between the solidification thermal variables speed of solidification [VL], cooling rate [T] and Mg contents in 6000 series aluminum alloys, starting with the modification of binary Al-0.6\%Si with Mg contents, utilizing thermal records of the castings in molds, which made possible the unidirectional heat extraction. The cast alloys produced in the laboratory were melted in a muffle furnace with a 10\% overheating and poured by a graphite crucible. The experimental velocity curves obtained express a lower initial profile with increasing Mg content. On the structural evolution, the columnar/equiaxed transition occurred on the same cooling rate of 0.85 K/s. These results point to the possibility of inhibition of the intense convective movement by the lower speed of solidification and by the fostering of the growing columnar grains by the lower cooling rate. Analyzing the results, it was found that the speed of solidification and cooling rate decreased with the Mg content variation, this variables show converging values from the middle point of the ingot, coinciding with the region of structural transition.
Keywords:6101 alloy; 6201 alloy; Speed of Solidification; Diluted Alloys.
Presentation Schedule: Monday, 18:40-19:00. Session: ETS3-2. Presenter: Pedro Henrique Lamarão.
ENCIT2012-389 APPLICATION OF THE GENERALIZED POLYNOMIAL CHAOS EXPANSION TO THE SIMULATION OF AN INTERNAL COMBUSTION ENGINE FUELED WITH ETHANOL - PDF
Marcus V. C. Souza, Marcelo José Colaço, Albino José Kalab Leiroz, UFRJ, Brazil
Abstract: The main subject of this paper consists in simulating the pressure curve of an internal combustion engine, with uncertainties in the mass fraction of burned fuel, when fueled with ethanol. For this purpose, the Wiener-Askey polynomial chaos was applied to a set of equations that represent the combustion process inside a single cylinder internal combustion engine modeled through a First Law analysis. The system of stochastic differential equation was numerically solved using the Mathematica® software. Two kinds of distribution were considered, Gaussian and uniform, to perform the stochastic solution. The results were compared against a deterministic solution.
Keywords:Internal combustion engines; Thermodynamic modelling; Wiener-Askey Polynomial Chaos; Uncertainties; Stochastic Differential Equation System.
Presentation Schedule: Wednesday, 16:20-16:40. Session: ETS4. Presenter: Marcus Souza.
ENCIT2012-030 COMPARISON STUDY: ETHANOL PRODUCTION INCREASE THROUGH THE INTRODUCTION OF BAGASSE ENZYMATIC HYDROLYSIS \& SURPLUS ELECTRICITY INCREASE, IN ETHANOL DISTILLERIES - PDF
Reynaldo Palácios-Bereche, Marcelo Modesto, Adriano Viana Ensinas, Silvia Azucena Nebra, UFABC, Brazil
Abstract: The conversion of biomass into biofuels represents an important option for both the exploitation of an alternative source of energy and the reduction of polluting gases, mainly carbon dioxide. Among the biofuels, the ethanol is the one that is attracting most attention. It is produced in large scale in Brazil using sugarcane as raw material through sugar fermentation sugars and distillation. However, the ethanol production can be increased through the introduction of enzymatic hydrolysis of lignocellulosic biomass such as sugarcane bagasse and trash. Nowadays, the ethanol production from lignocellulosic materials through hydrolysis process is being researched all over the world, including the installation of pilot plants to test different types of process. Nevertheless, the introduction of the bagasse hydrolysis process in the current ethanol production system is a real challenge, being bagasse the fuel of the current process and at the same time, raw material for the new one. Moreover there are some technological bottlenecks which must be solved in order to make enzymatic hydrolysis of bagasse feasible. Thus, the aim of this study is to evaluate the potential ethanol production increase and the impacts in electricity surplus of the cogeneration plant due to the introduction of enzymatic hydrolysis of bagasse in a conventional distillery and compare these results with another scenario, where all bagasse and trash surplus are used in the distillery cogeneration system, in order to maximize electricity surplus, considering a steam cycle provided with extraction-condensing turbines. Simulations in ASPEN PLUS® software were performed, in order to evaluate the mass and energy balances, for the studied processes. For case of enzymatic hydrolysis the use of trash and lignin cake, which is a residue of hydrolysis process, is considered as fuel in the cogeneration system in order to achieve significant ethanol production increase. In the electricity surplus study, an adequate higher pressure in the boiler and turbine has been researched.
Keywords:energy; ethanol; biofuel; hydrolysis; cogeneration.
Presentation Schedule: Monday, 17:20-17:40. Session: ETS3-2. Presenter: Reynaldo Palacios Bereche.
ENCIT2012-191 USE OF THE GITT FOR SOLVING EQUATIONS IN AGRICULTURE PRODUCTS - PDF
Cristiane Kelly Ferreira da Silva, João Nazareno Nonato Quaresma, UFPA, Brazil
Helcio Rangel Barreto Orlande, UFRJ, Brazil
Zaqueu Ernesto Silva, Edilma P. Oliveira, UFPA, Brazil
Abstract: This paper deals with the numerical simulation of heat and moisture transfer in capillary-porous bodies. The mathematical model is based on a set of coupled, heat and mass transfer equations proposed by Luikov subject to specified initial and boundary conditions. The Generalized Integral transform Techinique (GITT) is employed to obtain numerical-analytical solutions for mathematical model that pretict the transient distributions of temperature and moistue in a slab of agricultural products during drying. Was shown that the method have an application to problems of heat and mass transfer in agricultural products. It is shown that the governing dimensionless parameters have a considerable influence on the kinetics o the heat and moisture transfer.
Keywords:Mathematical modeling; Luikov's equations; Heat and mass transfer; GITT.
Presentation Schedule: NO PRESENTATION.
ENCIT2012-246 THE USE OF STRAW AS SUPPLEMENTARY FUEL FOR COGENERATION IN SUGARCANE MILLS - PDF
Rodnei Passolongo, Petrobras, Brazil
Lucas Mendes Scarpin, Paulo Sérgio Barbosa Santos, Cassio Roberto Macedo Maia, Ricardo Alan Verdú Ramos, UNESP, Brazil
Thiago Antonini Alves, UTFPR, Brazil
Abstract: This paper analyzes, from the thermodynamic, thermoeconomic and economic points of view, the integration of straw gasification in sugarcane mills, keeping the bagasse burning in the boiler to generate steam for the plant, being considered two cases. The first case considers the current steam power plant that uses modern and efficient equipment, including a boiler that produces steam at high temperature and pressure levels, that is used to generate electricity in a multistage extraction-condensation steam turbine and a backpressure turbine, being all drives of mills electrified. The second case involves the integration of straw gasification in the current steam power plant. The results show that the gasification plant promotes a substantial increase in electricity generation and in the plant efficiency. However, from thermoeconomic and economic points of view, the plant that integrates gasification has a higher cost of electricity generation, making the project unfeasible for current values of electricity sales.
Keywords:Cogeneration; Gasification; Straw; Sugarcane mills.
Presentation Schedule: Wednesday, 16:00-16:20. Session: ETS3-3. Presenter: Rodnei Passolongo.