https://orcid.org/0000-0002-7040-2131
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ABSTRACT
The performance analysis of a multigeneration (MG) energy system integrated into a conventional coal-fired power plant was evaluated and discussed according to the data measured in the existing steam power plant. The multigeneration energy system in the present work consists of four subsystems, namely Organic Rankine Cycle (ORC), Vapor Compression Refrigeration (VCR) System, Thermal Vapor Compression Desalination Plant (TVCDP) and Greenhouse Heating (GH) System. The thermodynamic analysis was performed through energy and exergy analyses associated with the efficiencies of the subsystem as well as the multigeneration plant. In addition, environmental impact analysis was carried out to calculate CO2 emission of the overall system to evaluate the effect of emissions caused by the energy systems. The results revealed that when the conventional steam power plant became multigeneration, the exergy efficiency increased from 39.1% to 39.84% and energy efficiency increased from 41.5% to 42.29%. Four subsystems were integrated into the existing steam power plant to reduce CO2 emissions from 230 kg/MWh to 225 kg/MWh.
Nomenclature
| = | Heat rate (kW) | |
| = | Work (kW) | |
| = | Exergy (kW) | |
| = | Mass flow rate (kg/s) | |
| A | = | Area (m2) |
| APH | = | Air Preheater |
| E | = | Energy (kJ) |
| ESP | = | Electrostatic precipitators |
| ex | = | Exergy per unit mass (kJ/kg) |
| fg | = | Flue gas |
| h | = | Entalphy (kJ/kg) |
| HEX | = | Heat exchanger |
| HP | = | High pressure |
| IDF | = | Induced draft fan |
| IP | = | Intermediate pressure |
| LP | = | Low pressure |
| m | = | Mass (kg) |
| MG | = | Multigeneration |
| s | = | Entropy (kJ/kg.K) |
| SPP | = | Steam power plant |
| T | = | Temperature (°C) |
| U | = | Overall heat transfer coefficient W/(m2K). |
| ΔT | = | Temperature differences (°C) |
| = | Mass fraction of moisture | |
| = | Ratio for coal | |
| = | Efficiency (%) |
Subscript
| a | = | Air |
| c | = | Compressor |
| D | = | Destruction |
| d | = | Distilled |
| eva | = | Evaporator |
| f | = | Fuel |
| fg | = | Flue gas |
| g | = | Greenhouse |
| in | = | Inlet |
| o | = | Death state |
| out | = | Outlet |
| s | = | Steam |
| spp | = | Steam power plant |
| sw | = | Seawater |
Acknowledgments
The researchers are grateful for contributions of the organization of Scientific Research Projects of Cukurova University this project under contract no: FDK-2016-7207.
Disclosure statement
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Additional information
Notes on contributors
Mehmet Tontu
Mehmet Tontu graduated from his PhD education in 2018 at the Çukurova University, Mechanical Engineering Department. He has been working as an Operation Lead Engineer in the ISKEN Sugozu Thermal Power Plant. His special research areas are thermodynamics and energy systems.
Besir Sahin
Besir Sahin works as a Professor at the Mechanical Engineering Department of Çukurova University. He has more than 200 publications. His research fields are energy, applied fluid mechanics and aerodynamics.
Mehmet Bilgili
Mehmet Bilgili completed his PhD in 2007 at the University of Çukurova. Currently, he has been working as a Professor at the Mechanical Engineering Department of Çukurova University. His research areas are energy and air-conditioning systems.