In the example below, all savings are based on a 20,000lb/hr boiler operating over a 24 hour period
for 8 hours at M.C.R., for 8 hours at 20% of M.C.R.. and 8 hours standby (banked).
8 hours High Fire, 8 hours Low Fire, 8 hours Standby – Blowdown without open time adjustment to
evaporation rate:
Natural Gas
(£10.25/1MBTU)
No.2 Oil (£14.96/1MBTU)
Average Steam Cost £19.22/1000lb £26.20/1000lb
Steam Production 144,538 lbs/day 145,042 lbs/day
Cost to Run Boiler (day) £2,460 /day £3,374.98 /day
Cost to Run Boiler (year) £897,900 /year £1,231,866 /year
8 hours High Fire, 8 hours Low Fire, 8 hours Standby – with open time adjustment to evaporation
rate:
Natural Gas
(£10.25/1MBTU)
No.2 Oil (£14.96/1MBTU)
Average Steam Cost £17.23 / 1000 lb £ 23.49 /1000lb
Steam Production 148,571 lbs / day 149,136 /day
Cost to Run Boiler (day) £2,460 / day £3,374.98 /day
Cost to Run Boiler (year) £897,900 / year £1,231,866 /year
Steam Production 52,756,302 lb/year 52,940,336 lb/year
From this data, and keeping the same fuel consumption as before, using the reduced time bottom
blowdown would give savings:
Typical Annual Savings (Gas) £25,373.49
Typical Annual Savings (Oil) £35,101.27
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