Navegando por Autor "Freitas, Marcelo da Costa"

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Análise do rendimento de uma caldeira flamotubular sem o reaproveitamento de retorno de condensado através de um pré aquecedor de água
(2021-05-13) Freitas, Marcelo da Costa; Machado, Carlos José Baptista; http://lattes.cnpq.br/2613703649034215; Lima, Placido Ferreira; http://lattes.cnpq.br/0865439005714077; Santos, Antônio Aurélio Pereira dos; http://lattes.cnpq.br/4252052970703374
This paper presents the analysis, sizing and installation of a heat exchanger in a threepass flamotubular boiler that operates with natural gas. The boiler outlet gases at 200ºC were used to preheat the available boiler feed water to 30ºC. The method adopted for the heat exchanger sizing was the effectiveness Number of Transfer Units (NUT). After installation of the heat exchanger, also called economizer, the feed water enters the boiler at 75 ° C. This temperature gain has made it possible to soften steam generation interruptions as replacement water enters the boiler, keeping steam working pressure more stable and improving the condition of steam generation. This made the equipment more efficient, reducing the production costs of the Styrofoam product. The economist's employment generated a monthly savings of 20% in natural gas consumption, or around 1620 Nm³ per month.