[PDF] Ecological and Exergetic Analysis of Hydrogen Production in a Sugar-Ethanol Plant

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Ecological and Exergetic Analysis of Hydrogen Production in a Sugar-Ethanol Plant

Abstract:

This work aims an ecological and exergetic analysis of the hydrogen production by steam reforming of part of the ethanol produced in a sugar-ethanol plant. The Pioneiros Distillery, located in São Paulo, is used as model for this study. Three cases are described. In case 1 the plant produces energy only for domestic needs. A part of
bagasse is not burned and it is stored. In Case 2, all available bagasse is used for production of steam. Part of the steam is used in the production process meeting the demand of the plant and the rest of steam is converted into electrical energy that can be sold at concessionaires.

In Case 2 it is produced more energy than in Case 1. Case 3 includes the production of hydrogen by steam reforming of a part of the produced ethanol. Steam and energy for steam reforming is generated from combustion of bagasse. An exergetic analysis is performed. The exergy flows associated with the sugar-ethanol plant are calculated locating and quantifying the losses and irreversibility. The ecological impact of use of the bagasse as fuel to generate thermal and electrical energy for the ethanol reformer was studied. The main pollutants that damage the atmosphere, name y: CO, CO2, NOx and PM have been taking into account. Carbon Dioxide emissions were calculated taking into account the carbon cycle (considering the absorption of carbon dioxide by the sugarcane during its growth), resulting in negative balance emissions, i.e., carbon dioxide was absorbed in higher amounts than emitted.

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