Combined gas and steam turbine power station with charged fluidised-bed furnace

摘要

In a combined gas and steam turbine power station with charged fluidised-bed furnace, a highly effective de-dusting of the flue gas is necessary for safe operation of the gas turbine. Further problems in known designs arise in the area of the immersion heating surfaces of the stationary, charged fluidised-bed furnaces and during part-load operation. The new method is structured in such a manner that an effective de-dusting can be carried out at a temperature around 250 to 450@C, the turbine inlet temperature of the flue gas lies at over 700@C to achieve good efficiency, and the furnace can also be controlled well during part-load operation. The method works with a circulating pressure-charged fluidised-bed furnace (11) as furnace system, some of the heat exchangers (15, 16, 17) being arranged directly above a fluidised-bed chamber (14). The flue gas is, after an effective de-dusting (23), mixed with by-pass air (5), heated to approximately 750@C in a heat exchanger (15), and then expanded in a gas turbine (2). In heat exchangers (16, 17, 20) of the steam generator system, high-pressure steam is generated, with which a steam turbine (39) is driven. The method serves for generating electrical energy from solid fuel. <IMAGE>