| 摘要 |
Power plant for burning fuel in a fluidized bed (30) at a pressure considerably exceeding the atmospheric pressure comprising a combustor (12) with water-cooled walls (14) which form a part of a feed water preheater, an evaporator (66), arranged in the combustor (12), having tubes arranged in the combustor which absorb heat from the fluidized bed (30) thereby cooling said bed, and at least one superheater (68) arranged in the combustor (12). According to the invention a by-pass conduit (104) for draining feed water is connected to a feed water conduit (82) between the feed water preheater (14) and the evaporator (66). This by-pass conduit (104) may be connected to a feed water tank (74). At very low load and in the case of a gas turbine trip, the necessary water flow for cooling the walls (14) of the combuustor (12) may exceed the demand of feed water to the evaporator (66). Under these operating conditions feed water may be drained off ahead of the evaporator (66) through said by-pass conduit (104). |
