Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
Evaluation and modeling of the part-load performance of a biomass steam generator integrated with a concentrated solar power plant
Submission Author:
Alvaro Adolfo Diaz Perez , SC
Co-Authors:
Alvaro Adolfo Diaz Perez, Eduardo Burin, Edson Bazzo
Presenter: Alvaro Adolfo Diaz Perez
doi://10.26678/ABCM.COBEM2021.COB2021-1442
Abstract
Hybrid systems involving the use of biomass and solar energy have been proposed as a promising alternative to reduce greenhouse gas emissions in the generation of heat and electricity. This integration provides a way to overcome the inherited shortcomings of solar energy, such as intermittent and instability. Nevertheless, it might be observed that some plant components will operate in the off-design condition once solar energy is added to the cycle, penalizing their performance at partial loads. In this regard, the objective of this work is to evaluate the performance of an existing biomass steam generator at partial loads, integrated with a Fresnel solar field on fuel saving mode. The equipment consists of a biomass steam generator fueled with eucalyptus chips with a capacity to produce up to 50 t/h of superheated steam at 420°C / 45 bar(a) to feed a cogeneration power plant for attending 3 MWe and 5.5 MWth capacity. Field data were collected on-site to calculate the boiler efficiency using the indirect method according to ASME PTC4 standard. The main components of the boiler were modeled using the OpenModelica® tool and the ThermoSysPro® library. The model accuracy was verified at different loads with the available steam generator measurement data and datasheets provided by the manufacturer. As a result, the model implemented allowed to reproduce the field data results for all studied partial loads. In the hybrid design, the boiler had a satisfactory thermodynamic behavior in the analyzed period, corresponding to a fuel saving of about 113.76 t/day (26.8%) for a typically clear day.
Keywords
Biomass steam generator, cogeneration, concentrated solar power, hybrid systems, Part-load operation
