Cost of steam generation
Cost of steam generation
(OP)
I want to calculate the cost of raising steam from a natural gas fired boiler.
If I have mains uninterruptasble natural gas at say 2 pence per KWh and a boiler that is 80% efficient how do I calculate the cost of raising 10 barg saturated steam?
I think it will work out about £15 per te but I want to calculate it so I can adjust the gas price and change to steam cost.
I'm not interested in other costs at the minute, just the natural gas part of the cost
If I have mains uninterruptasble natural gas at say 2 pence per KWh and a boiler that is 80% efficient how do I calculate the cost of raising 10 barg saturated steam?
I think it will work out about £15 per te but I want to calculate it so I can adjust the gas price and change to steam cost.
I'm not interested in other costs at the minute, just the natural gas part of the cost





RE: Cost of steam generation
rmw
RE: Cost of steam generation
I want to be able to work out how much btu's or kwh's are required to generate 10 barg steam. Then I can use this to work out a 'cost of steam generation'
RE: Cost of steam generation
A little more information is needed...
What assumption is to be made about the condensate return amount and temperature of the condensate feeding the boiler ?
If the boiler requires 100% makeup, then raising the temperature of 50F water to ~366F must be calculated.
If your system is new, and condensate is to be returned, the 190F condensate is a reasonable assumption.
Sample calculation:
To evaporate 212F water at 14.696 psia takes 970 BTU/lbm
Boiler Efficiency is ~.85; say natural gas is $5.00/mm BTU
Then: Evaporation Cost for 1 lb water is:
{(970)/(.85)}($5.00)/10000000 = $.0057
Or about $5.70 per 1000 lbs
Hope that this helps ?
-MJC