Obiettivo THE CEMENT INDUSTRY IS A LARGE CONSUMER OF ENERGY. IN ORDER TO PRODUCE 1 TONNE OF CLINKER (PRODUCT FROM THE KILN WHICH IS CRUSHED TO PRODUCE CEMENT) A WET-PROCESS FURNACE (THE OLDER PROCESS IN WHICH WATER WAS ADDED TO THE CLAY AND LIMESTONE FEED) CONSUMES ABOUT 1400 THERMS (ABOUT 140 KG OF FUEL OIL) WHILE A DRY PROCESS FURNACE CONSUMES ABOUT 850 THERMS (ABOUT 85 KG OF FUEL OIL). THEREFORE, IN RECENT YEARS, THERE HAS BEEN A MAJOR EFFORT TO CHANGE OVER FROM THE WET TO THE DRY PRODUCTION UNIT, BUT THE LATTER STILL NEEDS CONSIDERABLE IMPROVEMENT. A DRY PRODUCTION UNIT CONSISTS OF THREE MAJOR COMPONENTS, CYCLONE HEAT EXCHANGERS OR PREHEATERS OF THE FEED, A ROTATING KILN WHERE CLINKERING OF THE FEED TAKES PLACE, AND A COOLER WHICH ENABLES A LARGE PART OF THE HEAT FROM THE CLINKER TO BE RECOVERED. THE CYCLONE HEAT EXCHANGERS ARE USED TO PREHEAT THE FEED TO THE ROTATING KILN (FROM AMBIENT TEMPERATURE TO SOME 850 DEGREES C) BY COUNTER-CURRENT HEAT EXCHANGE BETWEEN THE COLD MATERIALS AND THE HOT EXCHAUST GASES (AT A TEMPERATURE OF AROUND 1000 DEGREES C) BEFORE THEY ARE DISCHARGED TO THE STACK (THE GASES ARE DRAWN UP TOWARDS THE TOP OF THE CYCLONE TOWER BY FANS). THE AIM OF THIS RESEARCH WAS TO OBTAIN A BETTER KNOWLEDGE OF THE OPERATION OF SUCH CYCLONE HEAT EXCHANGERS IN ORDER TO MAKE SUBSEQUENT MODIFICATIONS ENABLING HEAT EXCHANGE EFFICIENCY TO BE IMPROVED. THE PURPOSE WAS ALSO TO REDUCE THE ENERGY CONSUMPTION IN THE PREHEATER TOWER; ENERGY CAN BE SAVED BY DIMINISHING THE POWER CONSUMED BY THE FANS AND BY A BETTER USE OF THE HEAT BROUGHT BY THE GAS. LAFARGE COPPEE RECHERCHE AND CENG STUDIED THE MECHANICAL PERFORMANCES OF THE CYCLONES, I.E. THE RESIDENCE TIME OF THE MATERIALS, THE EFFICIENCY OF SEPARATION, THE PRESSURE GRADIENT, ETC. EXPERIMENTS WITH RADIOACTIVE TRACERS HAVE BEEN CARRIED OUT IN ORDER TO INVESTIGATE THESE PARAMETERS. A COMPUTER PROGRAMME HAS ALSO BEEN WRITTEN TO SIMULATE THE CYCLONES AND HAS BEEN VALIDATED BY THE EXPERIMENTAL DATA. THIS PROGRAMME HAS BEEN USED TO OPTIMISE THE CYCLONE GEOMETRY TO IMPROVE SEPARATION EFFICIENCY AND REDUCE PRESSURE DR Programma(i) PRE-ENNONUC 2C - Energy research and development programme (EEC), 1979-1983 Argomento(i) Data not available Invito a presentare proposte Data not available Meccanismo di finanziamento Data not available Coordinatore LAFARGE COPPEE RECHERCHE Contributo UE Nessun dato Indirizzo 07220 Francia Mostra sulla mappa Costo totale Nessun dato Partecipanti (1) Classifica in ordine alfabetico Classifica per Contributo UE Espandi tutto Riduci tutto Commissariat à l'Energie Atomique (CEA) Francia Contributo UE Nessun dato Indirizzo Centre d'Études de Grenoble Avenue des Martyrs 38041 Grenoble Mostra sulla mappa Costo totale Nessun dato
