I know I can make 58,000 Lbs. of steam @ 750* F. @ 700 psi from 4.8 tons of coal, how much natural gas would I have to burn to create an equivelent amount of steam? also how is a Lb. of steam measured
Answer:
The energy from coal is about 12000 BTU/lb for anthracite and 7500 BTU/lb for bituminous. Natural gas is around 21000 BTU/lb. Also, at standard conditions, there are about 25 ft^3 of natural gas per pound. All this means that 1 lb of anthracite has the same energy as 14 ft^3 of natural gas. For bituminous its 9 ft^3 per pound of coal.
I don't know if I understand your question about measuring pounds of steam. You could do it by measuring the liquid makeup and return to the boiler or by a mass flow meter at the output.
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