Minimum Fluidization Velocity of mixture of sand and sugarcane bagasse particles

Transcrição

1 Minimum Fluidization Velocity of mixture of sand and sugarcane bagasse particles Code: Nestor Proenza Pérez, Julio Santana Antunes, Ricardo Alan Verdú Ramos, Jose Luz Silveira Federal Center of Technological Education Celso Suckow da Fonseca (CEFET/RJ), Angra dos Reis Campus São Paulo State University (UNESP/FEG), Department of Energy Institute of Bioenergy Research (IPBEN-UNESP) 21/11/2017 1

2 Objectives Study of fluid-dynamic behavior of mixtures of the sugarcane bagasse particles and quartz sand 21/11/2017 2

3 Introduction million tons of ground sugarcane 167 millones de toneladas de bagazo 21/11/2017 3

4 Introduction million tons of ground sugarcane 167 millones de toneladas de bagazo 21/11/2017 4

5 Methodology Granulometric characterization: The Sauter mean diameter is calculated as: d p = Where: n i=1 1 x i d p,i d p,i = x i 2 + x i+1 2 x i + x i+1 4 0,33 Equipment used for particle size characterization. a) vibrating machine; b) digital balance 21/11/2017 5

6 Methodology Physical characterization: - Real Density - Apparent Density - Bulk Density 21/11/2017 ε mf = 1 ρ bulk ρ p Equipment used for physical characterization 6

7 Methodology Chemical characterization: - Proximate analysis: - High Heating Value (HHV): 21/11/2017 Equipment used for chemical characterization 7

8 Methodology FLUID-DYNAMIC TESTS ΔP = ε f H f ε 3 f 2 μ g V sg 2 φ d + 1,75 1 ε f ε 3 p f ρ g V f 2 φ d p A r = d p 3 ρ g ρ p ρ g g μ g 2 R emf = d p V mf ρ g μ g RMAE = V mfe V mft V mfe /11/2017 8

9 Experimental results 9.5mm mm mm mm mm mm mm mm d p = ± 0.08 mm 21/11/2017 9

10 Experimental results V mfmixture = 0,00002 A rm 1,7125 μ g d pm ρ g 21/11/

11 Experimental results 21/11/

12 Experimental results Inicio Implementação do algoritmo para a determinação do diâmetro interno. Figura 47 Entrada de dados Análise elementar do bagaço Altura do leito estático, m Potência necessária, kw Diâmetro da partícula 9,5mm Poder Calorífico Superior, kj/kg Parâmetros de funcionamento Determinação dos parâmetros físicos e geométricos empregando os modelos desenvolvidos Esfericidade, equação (12) Densidade Aparente, equação (16) Densidade a Granel, equação (18) Sim Utilização de material inerte Não Determinação da Vmf com o modelo desenvolvido, equação (95) Comprobação do dp 0,3mm Determinação dos demais parâmetros fluidodinâmicos Velocidade Terminal, cm/s Velocidade das bolha, cm/s Velocidade de Slugging, cm/s Diâmetro inicial da bolha, cm Diâmetro da bolha, cm Altura de mínima fluidização, m Altura de fluidização completa, m Porosidade na mínima fluidização, adim Porosidade do leito expandido, adim TDH(F), m Determinação da Vmf com o modelo desenvolvido, equação (94) Determinação da altura total do reator, equação (103) FIM 21/11/2017 TDH(C), m 12

13 Experimental results 21/11/

14 Conclusions The minimum fluidization velocity increases as the mass fraction of biomass in the mixture increases, as well as the average diameter of the bagasse particles in the range of 9.5 d pb >0.225 mm increases. For sugarcane bagasse in its natural form with long and thin particles, 2% is the limit of the mass fraction where a good fluidization occurs. A new correlation was developed to predict the minimum fluidization velocities for mixtures of sugarcane bagasse particles and quartz sand. A good fluidization regime (with little segregation) for biomass and sand mixtures was obtained using sugarcane bagasse particles in the range of diameter of 0.445<d pb <1.77 mm. 21/11/

15 Acknowledgments The authors are grateful to the Coordination for the Improvement of Higher Education Personnel (CAPES), from the Brazilian Ministry of Education (MEC), and to the National Council for Scientific and Technological Development (CNPq) (process /2017-0) from the Ministry of Science and Technology (MCT) because of their generous financial support to this research. In addition, the authors highly appreciate Mr. Fernando Araujo for his help and support to carry out the experimental analysis Laboratório de otimização de Sistemas energéticos 15