Cement, Energy and Environment

Satna Cement Works (SCW) has raw mill of Loeche Mill LM 36.4 with rated capacity of 235 tph @ 15% R+90 mic. The raw mill circuit consist of VRM with dynamic separator and mill fan. At present Raw mill opera ng at 260 tph @17% R+90 mic. Overall specific power consump on of raw mill is 12.3 kWh/t which comprises of 6.4 kWh/t on main drive and 6.0 kWh/t on mill fan. The plant main objec ves are as: · To improve raw mill produc vity from 260 tph to 300 tph · Reduc on in mill overall specific power consump on · Reduc on in water consump on to control the mill outlet temperature To meet the above objec ves the following modifica on are carried out: · Increase in louver ring inclina on from 38° to 60° · Review of nozzle ring area blind plates pa ern and its velocity · Sca er ring to louver ring gap minimized · Separator dynamic seal gap controlled with in-house rubber packing arrangement · Auto control logic provided in DCS · Addi onal sealing provided for Roller cap and mill body to reduce false air ingress through Rocker OPTIMIZATION OF RAW MILL TO ENHANCE PRODUCTIVITY AND REDUCTION IN POWER CONSUMPTION RS Soni, Dilip Modi and Vishad Agarwal Birla Corpora on Ltd, Satna Mill modifica on before and a er Op miza on: VRM Roller Addi onal Sealing Louver ring angle increased from 38° to 60° Before A er Before A er Mill Performance at Glance: PARAMETERS Produc on Rate Main Drive Load Fan Load Total specific Power UOM tph kWh/t mat. kWh/t mat. BEFORE 263 6.4 6.0 AFTER 277 5.8 5.5 IMPROVEMENT +14 -0.60 -0.50 Consump on (Main Drive + Fan) kWh/t mat. 12.4 11.3 -1.10 65