Laser-Ash (LASH) Particulate Fragmentation Removal Concept for Coal-Fired Turbine Power Plants

摘要

A novel method of high temperature particulate control for coal-fired gas turbines is to trap large coal-ash particulates (> 20 mu ) using conventional means and fragmenting remaining particulates, to sizes below that where unacceptable turbine erosion occurs (5 mu ), with pulsed CO sub 2 lasers. A 1000-MW(e) combined-cycle plant based on this concept is projected to operate at thermal efficiencies of about 40 percent. This plant needs 1.6 percent of its gross electrical output to drive the laser system. All technology employed is within the present-day state of the art, making this an attractive method for efficient electrical generation with coal. The laser-ash fragmentation system for the conceptual plant has been costed at 33 million dollars. Conventional low temperature emission control may be used on the low pressure outlet from the turbine. (ERA citation 04:022654)