Version 1
: Received: 13 February 2024 / Approved: 15 February 2024 / Online: 15 February 2024 (07:40:42 CET)
How to cite:
Haffejee, R.A.; Rousseau, P.; Laubscher, R. Integrated Performance of a Modular Biomass Boiler with a Combined Heat and Power Industrial Rankine Cycle and Supplementary sCO2 Brayton Cycle. Preprints2024, 2024020832. https://doi.org/10.20944/preprints202402.0832.v1
Haffejee, R.A.; Rousseau, P.; Laubscher, R. Integrated Performance of a Modular Biomass Boiler with a Combined Heat and Power Industrial Rankine Cycle and Supplementary sCO2 Brayton Cycle. Preprints 2024, 2024020832. https://doi.org/10.20944/preprints202402.0832.v1
Haffejee, R.A.; Rousseau, P.; Laubscher, R. Integrated Performance of a Modular Biomass Boiler with a Combined Heat and Power Industrial Rankine Cycle and Supplementary sCO2 Brayton Cycle. Preprints2024, 2024020832. https://doi.org/10.20944/preprints202402.0832.v1
APA Style
Haffejee, R.A., Rousseau, P., & Laubscher, R. (2024). Integrated Performance of a Modular Biomass Boiler with a Combined Heat and Power Industrial Rankine Cycle and Supplementary sCO<sub>2</sub> Brayton Cycle. Preprints. https://doi.org/10.20944/preprints202402.0832.v1
Chicago/Turabian Style
Haffejee, R.A., Pieter Rousseau and Ryno Laubscher. 2024 "Integrated Performance of a Modular Biomass Boiler with a Combined Heat and Power Industrial Rankine Cycle and Supplementary sCO<sub>2</sub> Brayton Cycle" Preprints. https://doi.org/10.20944/preprints202402.0832.v1
Abstract
In this paper, the integrated performance of a modular biomass boiler with an existing industrial Rankine steam heat and power cycle and a supplementary supercritical-CO2 (sCO2) Brayton cycle is analyzed. The aim is to leverage the high efficiency supplementary sCO2 cycle to increase net generation and energy efficiency from the existing biomass boiler. Two sCO2 heater configurations situated within the flue gas flow path are investigated, namely a single convective-dominant heater, and a dual heater configuration with a radiative and a convective heater. A quasi-steady-state 1D model was developed to simulate the integrated cycle, including detailed component characteristics for the Rankine and Brayton cycles. The model solves the mass, energy, momentum, and species balance equations. The system is analyzed for three cases: (i) the existing Rankine cycle without the sCO2 integration, (ii) with the single convective-dominant sCO2 heater configuration, and (iii) the dual sCO2 heater configuration. The results show the required rate of overfiring for the sCO2 configurations, with a 15.3% increase in fuel flowrate resulting in an additional 21.2% in net power output. The model quantifies the impact of the sCO2 heaters, with reduced heat uptakes for downstream boiler heat exchangers. Furnace water wall heat uptake increased due to overfiring, offsetting the reduced heat uptakes at downstream evaporative heat exchangers. The dual configuration has more impact on Rankine cycle operation due to the radiative sCO2 heater placement in front of the second superheater, absorbing some of the direct radiation from the furnace.
Keywords
biomass; supercritical-CO2; thermofluid process modelling; heat transfer
Subject
Engineering, Mechanical Engineering
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
