Importance

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Abstract

In a method and device for controlling power output during combustion in a pressurized fluidized bed, energy developed is taken out by heat transfer surfaces and a gas turbine, and heat is utilized in a steam turbine. The heat transfer surfaces include a high pressure section with one evaporator and a low pressure section with at least one intermediate superheater. In case of changes in the power output, the bed depth of the fluidized bed is varied, whereby heat transfer surfaces included in the evaporator are exposed or covered by the bed and production of high pressure steam, evaporation power, is controlled. Heat taken from the fluidized bed is controlled by controlling the temperature difference between the bed and low pressure stream flowing in the intermediate superheaters. High pressure steam, produced in the evaporator is superheated in a heat exchanger arranged outside the bed by low pressure steam from the intermediate superheaters before it is expanded in a high pressure steam turbine.

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First Claim