A steam boiler heats liquid water at 200degree C to superheated steam at 4 MPa a

Question

A steam boiler heats liquid water at 200degree C to superheated steam at 4 MPa and 400degree C. Coal from Utah is burned at atmospheric pressure with 50 percent excess air. The fuel and air enter the boiler at 25degree C and the products of combustion leave at 227degree C. The coal has an ultimate analysis (percent by mass) as 61.40 percent C, 5.79 percent H_2, 25.31 percent O_2, 1.09 percent N_2, 1.41 percent S, and 5.00 percent ash (non-combustibles). Neglect the effect of the sulfur in the energy and entropy balances. Part 1 Calculate the amount of steam generated per unit of fuel mass burned. m_s/m_f = kg steam/kg fuel Part 2 out of 4 Calculate the change in the exergy of the combustion streams. Delta X_gases = kJ/kg fuel

Explanation / Answer

part 2 out of 4

change in the energy of the combustion streams:

x gases = 14.64 kj/kg fuel

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