| 초록 |
A low carbon emitting combined Rankine cycle is proposed. In this cycle, the CO2 generated from the coal combustion unit is captured through the post combustion capture process using mono-ethanol amine (MEA). This capture process consumes only 73% of the conventional capture plant operation energy by employing advanced process configuration. An organic Rankine cycle (ORC) utilizing both low-grade heat from a pulverized coal power plant and liquefied natural gas (LNG) cold exergy is also installed and optimized in order to minimize the power de-rate. The ORC uses R601-R23-R14 ternary mixture as its working fluid and is integrated with a steam cycle as a bottoming cycle. By utilizing the hot and cold exergy of low-pressure steam and LNG that were initially wasted, the ORC is able to generate additional power without consuming fossil fuel. The CO2 captured from the capture process is liquefied by utilizing its latent heat as a heat source for the working fluid. 74.1 MW of additional electricity can be produced from ORC without consuming additional coal, thus both cycle efficiency and power de-rate resulted from CO2 capture process installation are greatly improved. |
