Techno-Economic Performance of Biogas-Fueled Micro Gas Turbine Cogeneration Systems in Sewage Treatment Plants: Effect of Prime Mover Generation Capacity

• Main Authors: F., Basrawi, Thamir K., Ibrahim, Khairul, Habib, Yamada, Takanobu, D. M. N., D. Idris
• Format: Article
• Language: English
• Published: Elsevier Ltd 2017
• Subjects: TJ Mechanical engineering and machinery
• Online Access: http://umpir.ump.edu.my/id/eprint/17116/1/Techno-economic%20performance%20of%20biogas-fueled%20micro%20gas%20turbine%20cogeneration%20systems%20in%20sewage%20treatment%20plants-%20Effect%20of%20prime%20mover%20generation%20capacity.pdf; http://umpir.ump.edu.my/id/eprint/17116/; https://doi.org/10.1016/j.energy.2017.02.066
• Institution: Universiti Malaysia Pahang

The optimum size of Micro Gas Turbine Cogeneration Systems (MGT-CGSs) in a Sewage Treatment Plant (STP) in terms of its economic performance was investigated. A STP operating in a cold region was adopted as a model and was scaled down to obtain different size ratios. It was also assumed to operate in different regions to obtain different heat demand patterns. MGT-CGSs with power output capacity of 30, 65 and 200 kW were simulated to utilize biogas produced by the STP. Instead of multiple units of the same size of MGT-CGSs, combination of different sizes of MGT-CGSs was also investigated. Life Cycle Cost Analysis was carried out to compare the economic performance of MGT-CGSs. It was found that optimum combination of three types of MGTs (MGT-Combined) stated above had the highest power generated and efficiency. However, MGT-Combined also had larger power generation capacity and low usage ratio, thus resulting in higher capital investment. Although all configurations of MGT-CGSs can generate Net Present Value, optimum configuration was obtained when the rated fuel input of MGT-CGS is approximately equal to the biogas production of the STP. However, when heat demand fluctuates throughout the year smaller size of MGT is preferred.