Exergy and exergoeconomic assessments of an electricity production system in a running wastewater treatment plant

Abstract

a b s t r a c tThis study aims at presenting a detailed exergy and exergoeconomic analyses of a biogas engine powered electricity production system in a wastewater treatment plant located in Adana, Turkey. The overall system consists of a compressor, a turbine, a pump, four heat exchangers and a gas engine. The effect of the each system component on the exergy efficiency and exergoeconomic parameters is analyzed separately. The analysis indicates that major exergy destruction happens in the gas engine as 4055.31 kW, followed by the exhaust gas heat exchanger (EGHE) and lubrication oil heat exchanger (LOHE) as 99.86 kW and 92.64 kW, respectively. The second law efficiency of the compressor, turbine, pump, BGHE, LOHE, WHE, EGHE and gas engine are found as 76.50%, 78.43%, 6.49%, 13.40%, 11.56%, 60.44%, 67.36%, and 50.79%, respectively. The operating and maintenance costs, capital investment cost and total cost of the system are reckoned as 14.

Can a Wastewater Treatment Plant Power Itself? Results from a Novel Biokinetic-Thermodynamic Analysis

“…The authors obtained overall energy and exergy efficiencies as 63.6% and 40%, respectively. Ozdil et al [33] conducted a detailed exergy and exergoeconomic analyses of a biogas powered electricity production in a WWTP. The authors found that the highest exergy destruction is obtained in the gas engine and an overall efficiency of 69.1%.…”

Thermodynamic and Environmental Comparative Investigation and Optimization of Landfill vs. Incineration for Municipal Solid Waste: A Case Study in Varamin, Iran

“…The outputs illustrated that the gas engine and exhaust gas heat exchanger had been had the highest rate of exergy destruction in the proposed system, respectively. Also, the total cost of the system was founded 28.64 US$/h, and the exergy cost and electricity production cost in the turbine were founded 4.87 US$/h and 11.32 US$/GJ [5]. Performance analyses of multi-effect desalination coupled to a combined cooling, heating and power energy system were accomplished.…”