technical NOTES

• N ote: Operating cost shall be validated with present condition.

7.8 Conclusion

7. 8 .1 Raw material Grinding:

• If material is soft in nature and have high moisture, definitely VRM is recommended.


• If material hardness is higher i.e. more than 7.5 to 8 KWh/ton at VRM shaft,
  then the case has to be evaluated for economics with respect to VRM or Roller
  press system. For economics evaluation, requirement of hot gas and overall
  power consumption is also a major consideration.


• It is also observed when moisture in raw material is high, Roller Press system
  require less hot gases as the purpose is only to dry the raw material and no
  lifting is required. In case of VRM, hot gas is required for lifting of raw material
  as well as for drying, so hot gas requirement is more in case of VRM. Hence
  heat availability for Waste heat recovery system will be less. This point should
  be evaluated in selection process.

RP Vs. VRM TECHNO-COMMERCIAL COMPARISON CEMENT MILL SYSTEM

S.N. Parameters Unit VRM RP

1.E Net Impact on Capital Cost Rs in Lacs 0 184

II) OPERATING COST

2.A Power Cost

1 Specific Power Consumption (Entire

Battery Limit)

kWh/Ton 34.20 30.35

2 Total cost of power per annum @ 4 Rs./

kwh @ 7260 Running Hrs.

Rs in Lacs/

Annum

2781 2380

3 Impact due to SPC (Annually) Rs in Lacs 401 0

2.B Cost of HAG fuel consumption @ 15%

feed Moisture at guaranteed production

1 Heat Requirement Mkcal/Hr 22.80 27.3

2 Cost of HAG Operation (Annually) @

1500 Rs./Mkcal @ 7260 R.Hrs.

Rs in Lacs 2483 2982

3 Impact of HAG (Annually) Rs in Lacs 0 499

2.C IMPACT ON VARIABLE COST PER

ANNUM (A3+B3)

Rs in Lacs 401 499

2.D Net Impact of Variable cost per annum Rs in Lacs 0 98

Total Impact (Capital + 3 Years

Variable) - [1E+(2D*3)]

Rs in Lacs 0 477

Total Impact (Capital + 5 Years

Variable) - [1E+(2D*5)]

Rs in Lacs 0 672