Process Modelling of Biogas Utilization System for the Landfill in Astana
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Date
2016-12
Authors
Myrzagaliyev, Azat
Journal Title
Journal ISSN
Volume Title
Publisher
Nazarbayev University School of Engineering and Digital Sciences
Abstract
This thesis provides estimates of energy potential of biogas produced from a
landfill in Astana in the form of electricity, as well as the economic assessment of
the proposed power plant design. The goals were accomplished by first assuring a
sufficient amount of landfill gas production rate. Then, a field work was carried to
determine the precise biogas content. Theoretical calculations were done using the
empirical equations recommended by the US Environmental Protection Agency
(EPA).
The energy model was simulated on ASPEN Plus. To reduce the concentration
of corrosive hydrogen sulfide (H2S) in the gas, a model of a water scrubbing system
was simulated in this work. Further, to obtain a maximum rate of power production,
the upgraded biogas was utilized in a combined cycle gas turbine (CCGT) unit. By
adding the Rankine cycle to the Brayton cycle to build up the combined system, the
efficiency of the system increased from 35% to 49%, with 5 MWh power output.
After obtaining the results of the energy model, the economic viability of the
project was evaluated. The analysis showed that with right investment terms, the
project is highly profitable. With equity payback period of 2 years, the NPV of the
project was above 6.5 billion KZT, and annual life cycle savings around 1 billion
KZT.
Description
Keywords
Biogas Utilization, Astana
Citation
Azat Myrzagaliyev; 2016; Process Modelling of Biogas Utilization System for the Landfill in Astana; School of Engineering. Department of Mechanical Engineering. Nazarbayev University; http://nur.nu.edu.kz/handle/123456789/2295