Parametric Study of a Regenerative Burner Working in a Flameless Combustion
Anton Skyrda Verissimo1; Ana Maura Araujo Rocha2; Ely Vieira Cortez2; Fernando de Souza Costa2; João Andrade de Carvalho Jr1
1 Faculdade de Engenharia de Guaratinguetá - UNESP; 2 Laboratório de Combustão e Propulsão - INPE
doi:10.20906/CPS/CON-2016-1163
Resumo
The most used method to produce energy in the world is still the combustion process. Conventional combustion processes consist to burn fuel and air directly to produce heat, generating also emissions of gases causing the greenhouse effect, of CO, CO2, NOx, SOx and other significant atmosphere emissions. The direct burn is widely used in the steel industry mainly in reheating furnaces. However, the most part of heat produced in the reheating process, about 60%, is rejected through the combustion products due to the limitations of the working temperature of the furnace. To heat recovery from the combustion products several methods can be employed such as steam producer, cogeneration, and so on. The problem in use this rejected heat in other process is that cannot be so efficient. The most attractive method is to use this rejected heat to preheat the combustion air to save fuel consumption. This avoids expend high investments in others devices to recovery the heat from the combustion products and their respective maintenance. However, increase the combustion air temperature in conventional combustion yield significant NOx emissions, becoming the method an environmental problem. In the two past decades, another combustion technology has been employed to minimize the emission pollutants. The technology called Flameless Combustion, consists to burn the fuel in the poor oxygen environment through the elevated recirculation of the combustion products or even diluting the air combustion or fuel with some inert, such CO2 or N2, for example. This technology has advantage to decrease the environmental impact produced by the pre-heating of the combustion air, such as the reducing the NOx and CO emissions. This work proposes to study the behavior of the pilot scale furnace, burning Natural Gas, equipped with a heat exchanger (HE), operating under flameless combustion mode to evaluate the best operational condition. The main objective is simulating the heat treatment from industrial processes and, through this, evaluates the
Palavras-chave: Flameless Combustion; Pollutant Emission; Heat Recovery; Regenerative Burner