Marco Antônio Rosa Do Nascimento

Anais do Congresso Internacional de Engenharia Mecânica e Industrial (2764-4294) - Estudo Da Viabilidade Do Uso De Duct Burners Em Caldeiras De Recuperação Utilizando A Técnica De Cfd

This study aims at carrying out an emission/performance experimental analysis to evaluate and compare the use of pure Biodiesel obtained from different sources: castor, soybean, and palm oil, in a 30 kW regenerative Diesel one shaft gas microturbine engine installed in the laboratories of the Federal University of Itajubá—UNIFEI, Brazil, at steady state condition and at different level loads. A comparison study with the obtained results for Biodiesel and Diesel was carried out for all cases. There were no significant changes in the performance of the microturbine that reached thermal efficiency levels of about 26%. The minimum heat rate obtained at full load was for the Biodiesel fuel from palm oil and the maximum was for castor oil, with a value 8.38% higher than the Diesel fuel. In addition, a slight rise in CO and a reduction in the NOx concentrations were observed.

Environment and energy are driven forces of human survival and development. Nowadays the use of primary energy comprises mostly mineral fuels, which have limited reserves and whose utilization may cause serious environmental impacts. Attention has been paid to discover clean and renewable resources such as syngas, which is an important renewable source of energy and is environment friendly. The use of syngas from biomass gasification process as fuel in regenerative gas turbine causes an increase in turbine exhaust mass flow and a change in the gas composition due to a low heat value. As a result, the regenerator changes its size, thermal characteristics, weight, and cost compared with the use of natural gas as fuel. The aim of this work is to assess the thermal performance, the size, and the cost of the recuperator of a 600 kW regenerative gas turbine engine when designed for syngas and natural gas. Two different types of surfaces, cross-corrugated and undulated-corrugated, are used for analysis. The results are shown, comparing heat-transfer coefficient, effectiveness, pressure loss, size, and cost for syngas and natural gas.

Distributed generation emerged as a new philosophy for electricity generation in our time, since then, it has been possible to see new concepts of technology following the idea of energy production away from the main producers or in remote areas, mainly in the countryside. Distributed generation technologies include small gas turbine engines, internal combustion reciprocating engines, photovoltaic panels, fuel cells, solar thermal conversion and Stirling engines using fossil and biofuels. Among them, the small gas turbine engine that generates electricity and heat working with fossil or renewable fuels is a promising technology for the near future. The aim of this work is the cycle analysis and preliminary compressor design of a 600kW simple cycle gas turbine engine that has been developed in Brazil. The 600kW engine will be the first prototype of its class in Brazil. A cycle performance calculation for different pressure ratios and turbine inlet temperature was carried out for fixed component efficiencies and losses. A selection of the design point was discussed and compared with the existing commercial engines of the same class. A compressor design point calculation was carried out with a mean line calculation CODE developed in FORTAN language. A CFD simulation was used for flow field analyses and design refinement.

NUMERICAL SIMULATION OF FLUID FLOW IN A CUBIC CAVITY WITH A FOUR-FINNED DISSIPATOR PLACED ON THE BOTTOM SURFACE