technical NOTES

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