Comparison for 4/ 5/6 Stage Preheater (Estimation at 9500 TPD Capacity)
PH Stage Reduction
Remarks
Data Unit 4 stage 5 Stage 6 Stage
Capex per MW
for WHRS Cr/MW 10.0 10.0 10.0
As per
differential cost
from Power
Sheet for future
projects
WHRS Costing
@ net power
generation
Lacs Rs 16266 13677 12407
Differential
WHRS Costing
Lacs Rs 3860 1271 0
Total
Differential
capex
Lacs Rs 2020 351 0
Interest cost
on additional
capex @ 7.0 %
Lacs Rs/
annum^141250
Differential
Capex
including
interest cost
Lacs Rs 2161 376 0
Payback
(Months )^ 35.4 56.1^
6 stage
operating
at 5 stage is
non-viable
A summary table is shown here to see the ROI on various fuel and power cost.
Data Differential ROI of 5 stage operation with respect to 6 stage installation
Power Cost
(Rs./kwh) 5.5^6 6.5 7.1
Fuel Cost
(Rs./ Mkcal)^
1000 Negative Opex Negative Opex 250.7 56.1
1200 Negative Opex Negative Opex Negative Opex Negative Opex
1400 Negative Opex Negative Opex Negative Opex Negative Opex
1500 Negative Opex Negative Opex Negative Opex Negative Opex