This paper addresses the impact of burning syngas in a large size, heavy-duty gas turbine designed to run on natural gas while maintaining hot section life. The process used to produce syngas is not discussed here; we mainly focus on analyzing the issues related to switching from natural gas to syngas on the gas turbine hot sections and the possibility of reducing the firing temperature in order to maintain the durability of the hot metal section life. The analysis indicate that the power output for a syngas-fired turbine plant could be increased as much as 20–25% when compared with the same turbine fired at the same metal temperature as the natural gas, however this increase in power output is also accompanied by an increase in the moisture content of the combustion products due largely to higher hydrogen content in the syngas and the increased turbine flow which contribute significantly to the overheating of turbine component parts. Correlations based on the hydrogen content as well as the lower heating value of the fuels were obtained in order to determine specific firing temperature reduction necessary to obtain durable metal temperature.
Fossil-fueled power plants typically operate below their design capacities for a large fraction of their service life. In the United States, increased fuel and capital costs attributable to this off-design operation are considerable. This article describes the reasons for off-design operation and its importance in designing and selecting new power plants. Recent studies of coal gasification combined-cycle power plants show how computer simulations of off-design performance can aid in the design process, and they suggest that such simulations can be useful in reducing the cost of building and operating new power plants.
Integrated gasification combined-cycle (IGCC) power plants offer a way to use solid or heavy liquid hydrocarbons, such as asphalt, in high-efficiency combined-cycle power plants. This paper reviews the history of IGCC power plants from the first unit, which was built in Germany in the 1970s, to the current wave of IGCCs being deployed in the 2010s. It draws heavily from the Electric Power Research Institute (EPRI) archive of information about IGCCs, which chronicles 40 years of nurturing the development of a number of coal gasification technologies. Insights from the operating experiences of earlier IGCCs will be examined, a comprehensive table listing all IGCCs built to date is provided and photos from many of the plants are included. The paper concludes with some recommendations for research and development which could set the direction for future applications of IGCC technologies.
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