Thermodynamic Analysis of the Integrated System that Produces Energy by Gradual Expansion from the Waste Heat of the Solid Waste Facility

Abstract

The rapid increase in consumer societies means an increase in waste facilities. Especially considering the amount of power used in waste plants and the corresponding amount of waste heat, an approach to recover waste heat in these plants has been proposed. The waste heat from the solid waste facility was first evaluated in the rankine cycle. An ORC system has been added to the lower cycle of the steam rankine cycle. The integrated system was completed by adding the waste heat from the Rankin steam cycle to the carbon dioxide cycle. These power generating systems are designed with two turbines each with gradual expansion. 1 kg/s of air at 873.2 K was obtained by evaluating the waste heat with sub-cycles. In terms of energy efficiency, it is seen that the R744 cascade cycle has the highest energy and exergy efficiency. Cooling with water in heat exchangers reduces the exhaust efficiency. The mass flow requirement is highest in ORC, where R123 fluid is used. The energy efficiency for the entire system was calculated as 11.2% and the exergy efficiency for the entire system was calculated as 4%. When Exergo Environment Analysis was made, exergy stability factor was found to be 0.453, exergetic sustainability index was found to be 0.04 . There is also 370K waste heat. This is recommended for use in drying units. Calculations were made with the EES (Engineering Equation Solver) program.