THERMOECONOMIC ANALYSIS OF BIOGAS ENGINES POWERED COGENERATION SYSTEM

Year 2019, Volume: 5 Issue: 2 - Issue Name: Special Issue 9: International Conference on Mechanical Engineering 2017, Istanbul, Turkey, 93 - 107, 29.01.2019

Daniela Chakyrova

https://doi.org/10.18186/thermal.532210

Cited By: 3

Abstract

This study presents an
analysis of an existing biogas engines-powered cogeneration system installed in
Varna Wastewater Treatment Plant, Bulgaria using thermoeconomic method. The
thermoeconomic analysis is conducted using three different groups of environmental
conditions. The SPECO (specific exergy cost) method is applied to the system
and cost balance equations are formulated for each component. The fuel F and the product P rules are used to obtain auxiliary equations. Moreover, in this
paper, various thermoeconomic performance parameters such as the cost of exergy
destruction, the relative cost difference and the exergoeconomic factor are
determined. The obtained results show that the specific unit exergetic cost of
the electrical power produced by the cogeneration system are found to be 30.0€/GJ = 0.11€/kWh, while the conducted
thermoeconomic analysis based on energy delivers a result of 0.19€/kWh for the
electrical work produced by biogas engines. In addition, the obtained results
are compared to those seen in similar studies.

Keywords

Biogas Engine, Cogeneration, Exergy, Thermoeconomics

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