Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
INTEGRATION OF A CONCENTRATED SOLAR POWER PLANT, A SUGAR-CANE BIORREFINERY AND A BIODIGESTION PLANT
Submission Author:
João Marcos Gomes Vieira , MG , Brazil
Co-Authors:
João Marcos Gomes Vieira, Marco Antônio Vieira, Hélio Augusto Goulart Diniz
Presenter: João Marcos Gomes Vieira
doi://10.26678/ABCM.ENCIT2018.CIT18-0094
Abstract
Electricity generation by solar hybrid power plants and sugarcane biorrefineries cogeneration systems are separated processes with a high potential for integration. Biorrefineries are already energetically self-sustainable but still allow big improvements, that take time due to the high life time of its current machinery. Ethanol production from cellulosic combings (as the sugarcane bagasse) and the vinasse biodigestion are examples of improvements directed to a better energy utilization of sugarcane. Both processes are not used yet in brazilian biorrefineries. The energy spent in the plants come from the bagasse, that is burned in a cogeneration process of vapor (used in the plant) and electric energy, also used in the plant and whose surplus is sold for the local public power grid manager. This work analyses the integration between a Concentrated Solar Power (CSP) plant and an ethanol production plant. The union of solar power plants and a burning fuel increases the economic viability of the whole business and the energy production reliability. A great source of biofuels like biomass and biogas is present in a sugarcane biorrefinery, with first and second generation ethanol production, biogas production from vinasse biodigestion and biogas and bagasse being burned to generate vapor in a combined system with the CSP plant. For that, data from an optimized biorrefinery were collected. These data include energy and biomass production per ton of sugarcane. A configuration and location were selected, for which solarimetric data, dimensions and components characteristics were collected. The integrated plant was sized considering both scenarios of maximum ethanol production and maximum electric energy exported to the grid, in order to maintain a constant operation twenty-four hours a day during the whole year. The solar plant was simulated in the software Ebsilon along the year with input measured irradiation data, in steady state intervals of 30 minutes. With the optimized solar field dimensions, the simulation attested to the integration viability, that avoids a thermal energy storage (TES) within the CSP plant. Event without the need of a TES, the coupling of a storage system to the integrated plant would allow the hybridized solar plant to be bigger and without wasting part of its peak steam generation periods.
Keywords
CSP, sugarcane, Bioethanol production, vinasse biodigestion, cogeneration
