Biomass gasification process integration with Stirling engine, solid oxide fuel cell, and multi-effect distillation
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Biomass gasification process integration with Stirling engine, solid oxide fuel cell, and multi‑effect distillation Armin Ebrahimi1 · Bahram Ghorbani2 · Masoud Ziabasharhagh1 · Mohammad Javad Rahimi3 Received: 29 August 2020 / Accepted: 26 September 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract Today, the use of a variety of energy with the approach of maximizing the efficiency of energy systems is inevitable regarding the increasing trend of energy demand in the world. Process integration reduces the number of equipment required and energy consumption. In this paper, an integrated structure is developed that includes a solid oxide fuel cell (SOFC), a Stirling engine, an organic Rankine cycle (ORC), and a multi-effect distillation using biomass gasification. This integrated structure produces 3103 kW net power, 2.773 kg s−1 desalinated water, and 3.908 kg s−1 hot water by receiving 1000 kg h−1 of biomass. Total electrical and total exergy efficiencies of the integrated system were obtained as 62.88% and 51.56%, respectively. The SOFC and ORC cycles energy efficiencies obtained 53.19 and 22.29%, respectively. The SOFC unit and ORC system exergy efficiencies were calculated by 58.09% and 50.77%, respectively. The largest contribution of the exergy destruction rate occurs in the solid oxide fuel cell and the heat exchangers, accounting for 37.31% and 30.43%. In the performed parametric analysis, the effect of moisture content of gasifier input fuel on the performance of the system was evaluated. One of the most important results is the increase of the total electrical efficiency of the system to 70.81% in case of the increase of moisture to 40 vol%. The maximum amount of net generated power and SOFC generated power occur at 25 vol% moisture content of gasifier input fuel. Graphic abstract 97.03 kW
Biomass 298.1 K, 1 bar, 0.2778 kg s–1
Biomass gasification and gas-cleaning system
Heat Power Material
Desalinated water
Syngas 1073.1 K, 1.29 bar, 0.7949 kg s–1
321.7 K, 0.1244 bar, 2.773 kg s–1
2655.7 kW
Air
298.1 K, 1.013 bar, 10.28 kg s–1
Stirling engine
773.1 K, 1.29 bar, 0.7949 kg s–1
Solid oxide fuel cell and gas turbine
H2O
298.1 K, 1.29 bar, 0.1667 kg s–1
1570.9 kW Multi-effect distillation (MED )
2350.8 kW
Sea H2O
298.1 K, 1.013 bar, 17.57 kg s–1
Organic Rankine cycle
350.2 kW
H2O 298.1 K, 1 bar, 3.908 kg s–1
H2O
370.1 K, 1 bar, 3.908 kg s–1
Keywords Integrated structure · Biomass gasification · Solid oxide fuel cell · MED desalination · Stirling engine cycle · Exergy analysis List of symbols
* Bahram Ghorbani [email protected] Extended author information available on the last page of the article
Abbreviations SOFC Solid oxide fuel cell SOEC Solid oxide electrolyzer cell LNG Liquefied natural gas CHHP Combined heat, hydrogen and power
13
Vol.:(0123456789)
SRK Soave–Redlich–Kwong equation RKS-BM Boston Mathias alpha function MED Multi-effect distillation HHV High heating value LHV Lower heating value PFD Process flow diagram Equipment names Ci Compressor i
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