Cel IN ORDER TO PRODUCE CEMENT, LIMESTONE IS OBTAINED FROM QUARRIES. IT IS THEN CRUSHED, MIXED WITH CLAY AND FED TO A CEMENT KILN FOR PRODUCTION OF CLINKER WHICH IS MILLED TO CEMENT. THE FLUCTUATIONS ENCOUNTERED IN THE COMPOSITION (DUE TO INSUFFICIENT MIXING) OF THE RAW MATERIAL FED TO THE CEMENT KILN MUST GENERALLY BE COMPENSATED FOR BY OVER-BAKING WHICH LEADS TO ENERGY LOSSES. THE FACTORY KILN AT "LE BOUCEAU" CONSUMED 850 TO 1 000 KCAL/TON OF CLINKER PRODUCED WHILE VALUES OF 720 TO 800 KCAL/TON CAN BE ACHIEVED UNDER PROPER OPERATING CONDITIONS.. THE AIM OF THIS PROJECT IS TO DETERMINE THE PARAMETERS WHICH GOVERN THE MIXING OF THIS RAW MATERIAL SO THAT OPTIMUM ENERGY CONSUMPTION CAN BE OBTAINED. BY DEVELOPING A NEW METHOD OF MARKING THE RAW MATERIAL WITH TRACERS, C.E.A. WAS ABLE TO STUDY THE EFFICIENCY OF THE HOMOGENISING SILOS AND THE PASSAGE OF THE MATERIAL THROUGH THE KILN, AS WELL AS OBTAINING A BETTER UNDERSTANDING OF THE OPERATION OF THE CRUSHER. IN ADDITION THE MIXING EFFICIENCY OF THE PRE-HOMOGENISING STOCKPILES WAS EVALUATED. THE RESEARCH WAS CARRIED OUT AT THE CEMENT FACTORY IN LE BOUCEAU NEAR BAYONNE. RESULTS INDICATE THAT THE CRUSHER IS A GOOD MIXER. THERE IS A SHORT CIRCUIT IN THE HOMOGENISING SILO AND MIXING THERE NEEDS TO BE IMPROVED. PRE-HOMOGENISING STOCKPILE EXPERIMENTAL RESULTS INDICATE THAT THIS IS NOT A GOOD MIXER. THE AVERAGE RESIDENCE TIME OF THE MATERIAL IN THE KILN IS ABOUT 1 1/2 HRS. 10 % OF THE MATERIALS, HOWEVER, STAY LESS THAN 45 MINUTES WHILE ANOTHER 10 % STAY MORE THAN 4 HRS. HENCE, A PART OF THE MATERIAL WITH LOW RESIDENCE TIME WILL BE UNDER-BAKED WHILE ANOTHER PART WITH LONG RESIDENCE TIME IS HEATED TOO LONG RESULTING IN WASTAGE OF ENERGY. PERFECT REGULATION OF RAW MATERIAL COMPOSITION WOULD LEAD TO 2 % DECREASE IN FUEL CONSUMPTION. AN ECONOMIC ASSESSMENT OF THE METHOD REVEALED A PAYBACK PERIOD OF 1 YEAR (INCLUDING THE COST OF THE STUDY AND OF ANY IMPROVEMENTS IN EQUIPMENT THAT THIS MAY INVOLVE). Program(-y) PRE-ENNONUC 2C - Energy research and development programme (EEC), 1979-1983 Temat(-y) Data not available Zaproszenie do składania wniosków Data not available System finansowania Data not available Koordynator Commissariat à l'Energie Atomique (CEA) Wkład UE Brak danych Adres Centre d'Etudes Nucléaires de Grenoble 38041 Grenoble Francja Zobacz na mapie Koszt całkowity Brak danych
