Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Experimental parameters from fluid dynamics and natural gas combustion in fluidized bed reactor
Submission Author:
João Diego Moreira Feitosa , CE
Co-Authors:
William Barcellos, Tiago Pires, Welkson C. Araújo, Lucas Ribeiro da Costa, Thiago Martins Dantas, Fernanda Emanuelle Possidonio Cardoso, Kaique Ribeiro, Marco Cavalcante D'Amico, José Welbson Carneiro de Araújo, João Diego Moreira Feitosa
Presenter: Tiago Pires
doi://10.26678/ABCM.COBEM2017.COB17-1437
Abstract
Gaseous fluidization of solid particles has been applied to the burning not only of natural gas (NG) but also of different kinds of fuels, including solid biomass, leading to low pollutant emission rates. In this context, this paper presents experimental results from studies about fluid dynamic and NG combustion in fluidized bed. Considering a silica particle bed and an airflow crossing its entire length, the main parameters about the gaseous fluidization of the solid phase were identified. The influences of bed diameter and particle size variation on the pressure profile were investigated, utilizing acrylic tubes with different diameters and proper bed heights, which allowed learning about the fluid dynamic phenomena. For a second research step, another study setup was built, using steel tube internally covered with refractory material, normally employed in combustion chambers of industrial boilers, to study the effects of surface roughness on the pressure profile and the minimum fluidization velocity. And, integrating experimental results from fluid dynamic studies with both the setups, a reactor was designed to analyze the combustion process in fluidized bed, specifying a chamber of 550-mm length and 53-mm diameter in which this diameter corresponds to the finest tube with the addition of the wall effects. In the sequence, the reactor was build and instrumented in order to measure pressure and temperature along the bed, which allowed monitoring the combustion process. Using NG as reference fuel, the process of startup was investigated and, on stabilized operation, NOx emissions lower than 10 ppm were obtained, pointing out limitations and particularities of this combustion thermal system.
Keywords
fluidized bed, Combustion, natural gas, NOx emissions.
