scholarly journals Metal speciation in natural river waters: measurement by diffusive gradients in thin-films and estimation by chemical equilibrium model

2007 ◽  
Vol 68 (3) ◽  
pp. 391-401 ◽  
Author(s):  
Takashi NAGAI ◽  
Kiyotaka TSUNEMI ◽  
Akemi KAWAMOTO
Keyword(s):  
Thin Films ◽  
Chemical Equilibrium ◽  
Equilibrium Model ◽  
Metal Speciation ◽  
River Waters ◽  
Diffusive Gradients ◽  
Chemical Equilibrium Model

Evaluation of trace metals bioavailability in Japanese river waters using DGT and a chemical equilibrium model

2013 ◽  
Vol 47 (14) ◽  
pp. 4880-4892 ◽  
Author(s):  
Shuping Han ◽  
Wataru Naito ◽  
Yoshimichi Hanai ◽  
Shigeki Masunaga
Keyword(s):  
Trace Metals ◽  
Chemical Equilibrium ◽  
Equilibrium Model ◽  
River Waters ◽  
Chemical Equilibrium Model

scholarly journals Development of a Chemical Equilibrium Model of the Downdraft Fixed Bed Gasification Process with known Product Temperature, Using air as an Oxidizing Agent

2020 ◽  
Vol 24 (1) ◽  
Author(s):  
Daniel Andres Quintero-Coronel ◽  
Edwin Edgardo Espinel-Blanco ◽  
Eder Norberto Flórez-Solano
Keyword(s):  
Chemical Equilibrium ◽  
Equilibrium Model ◽  
Fixed Bed ◽  
Palm Kernel ◽  
Outlet Temperature ◽  
Reaction Products ◽  
Gasification Process ◽  
Downdraft Fixed Bed ◽  
Gasification Reaction ◽  
Chemical Equilibrium Model

A chemical equilibrium model for known outlet temperature of the products was carried out on a downdraft fixed bed gasifier. Biomass from oil palm kernel is used with proximate and ultimate analysis; the general gasification reaction takes into account the biomass moisture, the reaction products are formed by CH4, H2O, N2, CO, CO2 and H2. The model is described in detail and the equations are solved using the EES software. The model shows the results obtained for temperature ranges from 500 K to 1500 K and 1.0 atm. The model is validated by direct comparison of the gas composition with the results reported in the literature for similar conditions, obtaining favorable results.

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