Development and Evaluation of a Superior Heat Recovery Design for Gas-Turbine Systems Using Gasified Coal.

摘要

This study investigates the impacts of high- and medium-temperature coal-gas clean-up methods on the thermal efficiency of coal-gas turbine systems for power generation, and the development of a novel heat-recovery design that improves the thermal efficiency of systems using medium-temperature clean-up. High-temperature clean-up cools hot coal gas (1850(degrees)F--2400(degrees)F) to 1200(degrees)F by evaporation of water; medium-temperature clean-up saturates the hot coal gas to about 400(degrees)F with evaporated water. The effect of using different methods of coal gasification is explored using a Texaco oxygen-fed gasifier and two fluid-bed gasifiers; one fed with oxygen, the other with air. The effect of different gasifiers on thermal efficiency is also investigated using the ISTIG design. The novel heat-recovery design is introduced and its performance is investigated with the three gasifiers. 8 refs., 23 figs., 15 tabs.