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A simple cycle combustion turbine has a lower thermal efficiency than a combined cycle machine. Although they may be less expensive to build, simple cycle combustion turbines, due to their low efficiency, cost more to run than most other plants. This results in increased cost per kWh during peak electrical loads.
The thermodynamic efficiency of simple-cycle gas turbine power plants ranges from 20 to 42%, with between 30 and 42% being average for a new plant. For greater efficiency, a heat recovery steam generator (HRSG) is added at the exhaust. This is known as a combined cycle plant.
In a simple cycle gas-turbine, also known as open-cycle gas-turbine (OCGT) generators, hot gas drives a gas turbine to generate electricity. This type of plant is relatively cheap to build and can start very quickly, but due to its lower efficiency is at most only run for a few hours a day as a peaking power plant .
A simple cycle gas turbine achieves energy conversion efficiencies from 20 to 35%. [5] Typical coal-based power plants operating at steam pressures of 170 bar and 570 °C run at efficiency of 35 to 38%, [6] with state-of-the-art fossil fuel plants at 46% efficiency. [7] Combined-cycle systems can reach higher values.
170 MW simple-cycle natural gas combustion turbine, 2-on-1 combined cycle unit consisting of two 170 MW natural gas combustion turbines and 200 MW steam turbine-electric generator [27] C.D. McIntosh Power Plant: NG: Polk County: 360: n/a: n/a: FPL: Combined cycle natural gas [28] C. D. Macintosh Jr. PE Polk County: 5 n/a 1978/12 n/a Lakeland ...
The simple-cycle efficiencies of early gas turbines were practically doubled by incorporating inter-cooling, regeneration (or recuperation), and reheating. These improvements, of course, come at the expense of increased initial and operation costs, and they cannot be justified unless the decrease in fuel costs offsets the increase in other costs.
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1x1 combined cycle Gas MMPA 2005/2007 High Bridge Plant St. Paul, Minnesota: 606 3 2x1 combined cycle Gas Xcel Energy: 2008 Hutchinson Plant Hutchinson, Minnesota: 86 4 2x1 combined cycle, simple cycle (x1) Gas HUC 1971/1994/2001 Inver Hills Plant Inver Grove Heights, Minnesota: 371 6 Simple cycle (x6) Gas & oil (x6) Xcel Energy: 1972/1997