Cryogenic Grinding Essay

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CRYOGENIC GRINDING TECHNOLOGY BY K.LOKESHWARAN B.E(MECH.)-IV YEAR MSEC KEY CONCEPTS CAUSATION FOR NEED OF CRYO-GRINDING EXTRAPOLATING THE CONCEPT OF PHYSICS PROCESS FLOW OF TYPICAL CRYO-GRINDING PLANT PROS OF CRYO-GRINDING KEY RESULT AREAS OF CRYO-GRINDING SUPPORTING IDEAS SHORTCOMINGS OF CONVENTIONAL GRINDING GRINDING OF SPICES CONVENTIONAL GRINDING • 99% mechanical energy →Heat energy • Cooling-significant issue • Melting of raw material & less tool life • Clogging and gumming of mill • Low throughput - 100 kg/hr • Not suitable for heat sensitive, thermoplastic and elastic materials HERE COMES THE NECESSITY OF CRYOGENIC GRINDING ..........Also called as FREEZE GRINDING CRYOGENIC GRINDING • Suitable for elastic , plastic and heat sensitive material • FINE PARTICLE PULVERIZATION WITH LN₂ • Cooling below embrittlement temperature ↓↓ Brittle fracture CONCEPT OF PHYSICS DUCTILE MATERIAL EXTRAPOLATION TO GRINDING PROCESS BRITTLE MATERIAL STRAIN ENERGY = ½(STRESS × STRAIN) TYPICAL PROPERTIES OF NITROGEN 78.09% of air Inert (at sub-zero temperatures) Non-inflammable Non-toxic Purity : 99.998% (in liquid phase) PROCESS FLOW • CLEANING OF RAW MATERIAL • LOAD IN HOOPER BY A CONVEYOR • VIBRATORY FEEDER AND SENSOR • HELICAL SCREW CONVEYOR • FEEDING OF SPICES IN PIN MILL WITH STUD DISC • GRINDING AT INERT ATMOSPHERE • EXTRACTION AND RECYCLING OF LN₂ VAPOURS • PACKING IN INERT ATMOSPHERE TRADITIONAL GRINDING HEAT DEVELOPMENT(200ᵒC) LOSS OF ESSENTIAL OIL BY EVAPORATION(80%) & MELTING OF HEAT SENSITIVE FAT(43%) CRYOGENIC GRINDING TEMPERATURE BELOW SUB-ZERO (-150ᵒC) NEGLIGIBLE LOSS OF ESSENTIAL OIL (1560 crores per annum) • Recycling of non-biodegradable materials FUTURE PROSPECTS • Solution to reduce cost by 80% • Cryo-grinding plant in Germany (fragmentation about 300Kg/hr) • Global Agri system in

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