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Posted by Gburns on March 22, 2002 at 10:38:20:
In Reply to: condensate cost calculations posted by Dan Roy on March 21, 2002 at 09:43:31:
Typically you calculate your cost based on the cost of boiler water make-up (water plus treatment costs) plus the cost of steam to increase the make-up to the condensate temperature in the DA. This will be different from plant to plant and some plants have restrictions on water usage. Other than the steam to heat the make up water the cost is fairly independent of steam cost.
If you are passing your steam through a turbine and not through a PRV, then the 50# steam cost is much less than $5.00 p/Klb because you have to weigh the cost of making power versus the cost of buying from a utility. In some plants the value of 50# steam can be negative. In those cases venting of steam to produce power is economical, however, I doubt that in your case because $5 is fairly high.