Abstract
The supply of solid fuel is a problematic control task in power plants. Neither the coal flow to the furnace or the heat generated in the combustion can be directly measured. However, if the disturbances in the combustion process could be estimated, the disturbances in the fuel power could be eliminated. This investigation developes a new measuring method for estimating the fuel power supplied in a coal power plant. The basis for the estimation is the oxygen consumption in the furnace, which can be calculated using measurements of the air supplied to the furnace and the excess oxygen in the flue gas. Due to the fast Zro2-oxygen analyzers the estimate for the fuel power can be calculated about one minute after the feed disturbance. This makes a new compensation loop for the fuel power supply possible. The different connections and control modes were simulated. The control concept was tested at Inkoo power plant and compared with the present system. The effect of the feed disturbance on the amplitude and the settling time of the response of the generator power decreased to about one third of the original when the new cascade compensation loop was added to the present system.
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