Obiettivo
Development, construction and testing of a stationary fluidized-bed fired boiler plant with superimposed circulation for the combustion of highly sulphureous lignite having varying sulphur content. The influence of the said fuel upon the performance in service and the pollutant emissions are studied under a long-term test programme.
The trials were completed, the guaranteed values being met. The plant was well controlled over the load range from 34 to 100%. The plant had operated for more than 12,000 hours up to September 1988, meeting emission limits or being for below these limiting values.
In the industrial heating and power plant of Thyssen Henschel at Kassel, a Thyssen-Oekoflow fluidized-bed fired boiler was substituted for an obsolete lignite-fired boiler plant (constructed in 1938) with low steam parameters (15 bar/ 350 deg. C). After the new 33 MW demonstration plant (83 bar/525 deg. C) had been conceived and designed, the new boiler was erected and commissioned in 1987/88. In the fuel engineering applied, a circulating hot fuel and ash flow is superimposed on a stationary fluidized bed while cold flue gas is recirculated in an amount as determined by the thermal power of the fuel.
Besides the application of the said fuel engineering to the combustion of highly sulphureous lignite and the plant components used for this purpose, the expected emission values were another interesting aspect of the project; thus, retention of SO2 has to exceed 96% in order that the approval requirements are met.
The operational results hitherto obtained show that the emissions cansurely be kept below the approved values. The designed parameters are also met without any problems. At present, a measuring and optimizing programme is still being accomplished in cooperation with the Technical University Hamburg-Harburg.
The fluidized-bed process applied is absolutely appropriate for efficient and environmentally sound combustion of highly sulphureous lignite.
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DEM - Demonstration contractsCoordinatore
4300 ESSEN 1
Germania