scholarly journals Optimal Share of Natural Gas in the Electric Power Generation of South Korea: A Note

2019 ◽  
Vol 11 (13) ◽  
pp. 3705 ◽  
Author(s):  
Gyeong-Sam Kim ◽  
Hyo-Jin Kim ◽  
Seung-Hoon Yoo
Keyword(s):  
Power Generation ◽  
Natural Gas ◽  
South Korea ◽  
Electric Power ◽  
Production Function ◽  
Peak Power ◽  
Annual Data ◽  
Electric Power Generation ◽  
National Output

Natural gas (NG) not only emits fewer greenhouse gases and air pollutants than coal but also plays the role of a peak power source that can respond immediately to the variability of increasing renewables. Although the share of NG generation worldwide is increasing, it is difficult for South Korea to increase its NG generation significantly in terms of fuel supply security, since it depends on imports for all of the NG used for power generation. Therefore, the optimal share of NG generation in electric power generation is a serious concern. This note attempts to estimate the optimal share by modelling the plausible relationship between NG generation and national output in the Cobb–Douglas production function setting and then deriving the output-maximizing share of NG generation. The production function is statistically significantly estimated using annual data from 1990 to 2016, allowing for the first-order serial correlation. The optimal share is computed to be 20.3%. Therefore, it is recommended that South Korea increases the share of NG generation slightly and makes efforts to secure a stable NG supply, given that, according to the national plan, the share will be 18.8% in 2030.

scholarly journals Thermodynamic analysis of a system to generate electrical energy from the mechanical energy of a natural gas

2020 ◽  
Vol 25 (2) ◽  
pp. 240-253
Author(s):  
José Daniel Hernández-Vásquez ◽  
Rubén Darío Pardo-Zapata ◽  
Brandon Eduardo Carroll-Gutierrez
Keyword(s):  
Power Generation ◽  
Natural Gas ◽  
Electric Power ◽  
Distribution System ◽  
Control Volume ◽  
Mechanical Energy ◽  
Research Work ◽  
Mechanical Power ◽  
Gas Distribution ◽  
Electric Power Generation

The objective of this work is to design a system for generating electricity from the mechanical energy of a natural gas at high pressure. The main motivation for the development of the research is based on the need to detect by the natural gas distribution industry, where it is considered that the use of the mechanical energy of natural gas (flow energy and kinetic energy) can be used for the Electric power generation, through a turbo expander, and thus power the electromechanical components of a substation. In this way, energy consumption costs are reduced, which translates into unquestionable gains in energy efficiency. The methodology applied is based on the use of physical principles such as the conservation of mass and energy in a control volume. Likewise, the guidelines established in the guideline for the expression of measurement uncertainty allowed us to estimate an interval where the real value of the mechanical power generated at the output of the turboexpander is found. Based on experimental data in a natural gas distribution substation, the consolidated results allowed quantifying the average mechanical power at the inlet of a turboexpander (8155 W) and, in the typical situation where the turboexpander reduces its outlet pressure to 50% , an average mechanical power is generated at the output of the turboexpander equal to 4893 W, which translates into an efficiency of 40%. This research work allowed us to conclude that the design of a system for electric power generation is viable based on the thermodynamic and dimensional parameters associated with the natural gas distribution system, as well as the mechanical power that can be generated at the exit of a turboexpander.

Sign in / Sign up

Export Citation Format

Share Document