Blowdown Savings can be illustrated by the following example:
|
Make-up
Water TDS Level |
300 ppm
|
|
Make-up
water temperature: |
60°F /
15.6°C |
|
% of
Make-up: |
100%
|
|
Blowdown
TDS level in conventional boiler: |
3000 ppm
|
|
TDS
level in Clayton feedwater: |
6500 ppm
|
|
Average
boiler load: |
300 BHP
/ 2943kW |
|
Boiler
Efficiency: |
80%
|
|
Steam
Pressure |
125 psig
/ 9.6 barg
|
|
Hours of
operation per day: |
16 hours
per day |
|
Days of
operation per year: |
312 days
per year |
|
Cost of
natural gas: |
£0.03 per
kW.h |
In this case, the savings in blowdown, is 360 kg. of water per
hour, which equates to annual savings, based on the assumptions
shown, of just over £18,000. This could easily represent greater
than 6% of the installed cost of the new equipment and, most
importantly, these savings are ongoing.