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System Analysis of Simplified IGCC (Integrated Gasification Combined Cycle) Plants

机译：简化IGCC（整体煤气化联合循环）装置的系统分析

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The Integrated Gasification Combined Cycle (IGCC) has been identified as an advanced coal-to-electricity power generation system with the potential for attractive performance and economic characteristics. A 100 MW demonstration of this concept has been constructed on the Southern California Edison utility system and is supplying electrical output to the grid with excellent availability. With this successful demonstration accomplished, approaches are being evaluated that will retain the attractive operational and environmental characteristics of the IGCC system while offering the potential for increased efficiency and reduced capital cost. The current system evaluation study has focused on developing the performance and economic advantages of these simplification techniques. The simplified IGCC system attempts to achieve reduction in capital cost through elimination of a number of major plant elements while maintaining or increasing the plant efficiency. The elements in the gasification subsystem are simplified by air blowing the gasifier and providing the coal in a dry feed system. By using a fixed-bed gasifier, the gas outlet temperature is reduced to a point where gas cooling is not required and the cleanup functions are performed at gasifier exit temperature directly. When these modifications are employed, the process flow schematic is reduced in complexity. Taking the simplification concept one step further, the power generation system can be modified to include direct combustion of the high-temperature coal gas without any additional heat exchange. The steam generated in the heat recovery steam generator can also be injected into the gas turbine flow path (eliminating the steam turbine) or used in a conventional steam turbine bottoming plant. 42 figs., 43 tabs. (ERA citation 12:010702)

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