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Posted by Tony Conner on March 15, 2004 at 14:15:28:
In Reply to: eff. need answer and reason posted by mark on March 15, 2004 at 08:19:47:
What I've found, after working on some boilers of this scale that had nice, accurate, pressure compensated steam flow meters, and individual fuel meters, was that the efficiency peaks about 75% of the boiler capacity. You'll likely see maximum efficiency at about 45,000#/hr. The efficiency will flatten out, then actually start to drop off slighty as you begin to approach 100% load. Probably the best boiler efficiency you'll hit is about 80 - 82%. You'll lose a couple of % as you head toward full load, and drift down into something in the high 70's as you move toward the bottom end of the turndown for the burner. You can do all kinds of things with air and fuel flow to match the steam load on the boiler, but the one thing that you cannot do is change the size of the furnace.