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Zawartość zarchiwizowana w dniu 2019-03-15

ENERGY RECOVERY FROM CAST IRON MELTING FURNACES

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THE POSSIBILITIES FOR HEAT RECOVERY FROM A CAST IRON MELTING FURNACE WERE STUDIED BY TEKSID. A CUPOLA FURNACE WHICH PRODUCES 40 TONNE STEEL PER HOUR, PRODUCES 25 000 NM3/H OF FLUE GASES WHICH CONTAIN 16 - 22 % CO. TAKING INTO ACCOUNT THE HEAT LOSSES AT THE CHIMNEY WHERE FUMES ARE COOLED TO 200 DEGREES C THE RECOVERABLE HEAT IS ABOUT 12.4 - 10EXP6 KCAL/H WHICH MAINLY CONSISTS OF COMBUSTION HEAT IN CO. THIS STUDY SHOWED THAT THE HEAT CAN BE USED FOR THE PRODUCTION OF ELECTRICITY, WHICH WILL BE USED IN THE PLANT. RECOVERY OF 87 KWH OF ELECTRICITY PER TONNE OF STEEL PRODUCED IS POSSIBLE. A STEAM TURBINE DRIVEN GENERATOR OF 3.5 MW WILL BE REQUIRED. THE COMBUSTION OF THE LOW CALORIFIC GAS (APPROXIMATELY 400 KCAL/NM3) HAS BEEN STUDIED AND GAVE POSITIVE RESULTS : WET CO GAS CAN BE BURNT WITHOUT ADDITION OF METHANE AND PREHEATING OF AIR IS NOT REQUIRED. THE PILOT PLANT CONSISTING OF A THERMIC SYSTEM (COMBUSTION CHAMBER AND EQUIPMENT TO PRODUCE AND CONDENSE STEAM WITHOUT TURBINE AND GENERATOR) WAS BUILT AND RUN SATISFACTORILY.

FOULING PROBLEMS HAVE ARISEN DUE TO THE PRESENCE OF RESIDUAL DUST. IT WAS THEREFORE NECESSARY TO COMPLETE THIS RESEARCH, WIDENING THE SCOPE TO INCLUDE UNPURIFIED GASES (CONTRACT EE-B2-163). THE AIM IS TO OBSERVE THE TYPE AND THE INTENSITY OF FOULING CAUSED BY DUST ON THE GAS SIDE HEAT EXCHANGE SURFACE OF THE PLANT AND TO STUDY THE MOST SUITABLE CLEANING SYSTEMS. THE FREQUENCY OF INTERVENTION AND THE MAINTENANCE COSTS AS WELL AS THE DEGREE OF SPONTANEOUS SEPARATION OF DUSTS WOULD ALSO BE EXAMINED. IN ORDER TO CARRY OUT THE STUDY, THE EXISTING HEAT RECOVERY PILOT PLANT WILL BE CONNECTED TO THE CUPOLA FURNACE, BY INSULATED AND PARTIALLY FIRE-PROOF PIPELINES (IN VIEW OF THE INFLAMMABLE GASES BEING CARRIED), WITH CYCLONES IN THE MIDDLE. THE EXISTING PLANT WILL ALSO BE MODIFIED IN ORDER TO INCORPORATE THE CLEANING SYSTEMS.

CONTRACT EE-B2-162 - PERIOD : 27 MONTHS
CONRTRACT EE-B2-163 - PERIOD : 12 MONTHS.

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Teksid SpA
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Corso G. Agnelli 250
10135 Torino
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