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Abstract

THE AIM OF THE DEMONSTRATION PROJECT WAS TO ADAPT AND OPERATE AN EXISTING 6MW STEAM BOILER WITH INTEGRATED FLUIDIZED BED FIRING SO THAT A WIDE RANGE OF FUELS COULD BE BURNT IN AN ENVIRONMENTALLY ACCEPTABLE MANNER WITH FULLY AUTOMATIC OPERATION OF THE PLANT. THIS AIM WAS ACHIEVED. THE FUELS INCLUDED HIGH AND LOW VOLATILE COALS OF UP TO 30 MM IN SIZE WITH ASH CONTENTS FROM 4 TO 45%, COAL-WATER SUSPENSIONS CONTAINING MORE THAN 70% SOLIDS, HYDROGENATION RESIDUES AND PITCH AND, MIXED WITH COAL, REFUSE BRIQUETTES AND SPENT COKE OVEN GAS CLEANING RESIDUES CONTAINING MORE THAN 30% SULPHUR. THE DESIRED FUEL FLEXIBILITY AND THE POSSIBILITY OF REDUCING OPERATING COSTS BY COMPLETELY AUTOMATIC OPERATION WERE DEMONSTRATED. IT WAS ALSO SHOWN THAT COAL COULD BE AS CONVENIENT FOR THE USER AS OIL OR GAS. TESTS WERE CARRIED OUT TO DISPLAY THE SULPHUR-RETAINING POTENTIAL OF VARIOUS LIMESTONES AVAILABLE ON THE MARKET. THE INSTALLATION OF AIR STAGING MADE IT POSSIBLE TO MEET THE INCREASINGLY SEVERE LIMITS FOR NO(X) EMISSIONS. ALL THE EMISSION LIMITS PRESCRIBED BY TA-LUFT 86 WERE MET, AND EMISSIONS WERE IN SOME CASES WELL BELOW THE REQUIRED VALUES. SPECIAL MEASUREMENTS OF EMISSIONS OF HYDROCARBONS, POLYCYCLIC AROMATIC HYDROCARBONS AND TRACE ELEMENTS IN THE WASTE GASES GAVE RESULTS THAT WERE SIGNIFICANTLY BELOW THE TA-LUFT 86 LIMIT VALUES, AND WERE AT THE LIMIT OF DETECTABILITY IN CERTAIN CASES.

Additional information

Authors: RUHRKOHLE OEL UND GAS RUHRKOHLE OEL UND GAS GMBH, BOTTROP, D, RUHRKOHLE OEL UND GAS GMBH, BOTTROP, D
Bibliographic Reference: EUR 11793 EN (1988) FS, PP 51, ECU 5.00, AVAILABILITY: EUROFFICE, LUXEMBOURG, BP 1003, GDL
Availability: Can be ordered online
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