Eventos Anais de eventos
ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
EXERGOECONOMIC ANALYSIS OF AMMONIA PRODUCTION FROM RESIDUAL BAGASSE GASIFICATION
Submission Author:
Rodrigo Telini , SP , Brazil
Co-Authors:
Rodrigo Telini, Daniel Florez-Orrego, Silvio de Oliveira Junior
Presenter: Rodrigo Telini
doi://10.26678/ABCM.ENCIT2020.CIT20-0798
Abstract
This work aims to evaluate the potential to produce synthetic nitrogen fertilizers from sugarcane bagasse in São Paulo state. An ammonia synthesis plant with biomass gasification at atmospheric pressure is fed with the residues of a sugarcane mill in order to produce more valuable products than only electricity surplus and to partially or totally decarbonize the production of these compounds. Two scenarios were analysed, one considering a bagasse surplus from the mill and the other with no bagasse surplus, i.e. using it only to generate electricity to the grid. The analysis also includes a preliminary assessment of the collection and transportation of all the surplus bagasse to the ammonia plant. As a result, a maximum potential of ammonia production of about 1240 tNH3/day would be possible, considering a radius of 20 km around the city of Pradópolis, in a scenario that would involve only the consumption of the surplus bagasse from two sugarcane plants. Moreover, the net revenues obtained were fourfold when using residual bagasse to produce ammonia, compared to the case in which only electricity surplus is sold by the sugar cane mill cogeneration plant. This fact is explained by a more profitable biomass upgrading and diversification of the marketable products. Particularly, the highest revenue corresponds to an ammonia plant configuration that uses residual bagasse as feedstock and natural gas as utility fuel in a combined cycle at the chemical ammonia plant utility system. Finally, the lowest unit exergy costs of ammonia and CO2 produced correspond to the configuration that imports electricity form the grid to drive the processes of the ammonia chemical plant.
Keywords
Ammonia, bagasse, Gasification, exergy, CO2
DOWNLOAD PDF VIEW PRESENTATION
