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Posted by Tony Conner on August 10, 2002 at 13:31:33:
In Reply to: will some give me answer of this question posted by suzi on August 10, 2002 at 10:45:43:
You'll have do the conversions, as I function better in Imperial units. I'm also making some assumptions.
If it's a common industrial boiler, then it'll add about 1,000 BTU/lb to the feedwater to make steam. 14 (I'm assuming) metric tons/per hour is 30,800 lbs per hour steam produced. Since the boiler has added 1,000 BTU/lb, then the BTU/hr output will be about 30,800,000. 90% eff will mean that 30,800,000 / 0.9 = 34,222 BTU/hr input from the burner. You'll have to look up what kind of fuel oil you're burning, and the heat value per unit. That will tell you how many pounds/gallons/kilograms/litres will be required.
I doubt very much that you'll get 90% efficiency in anything other than steady load under lab conditions, if even there. Real world will likely be more in the 80% range. Lower again if the boiler cycles on and off very much.