METHOD FOR NEUTRALIZING FLUE GASES OF FUEL-BURNING UNITS Russian patent published in 2006 - IPC F23G7/06 

FIELD: toxic flue gas combustion technology for fuel-burning units.

SUBSTANCE: flue gases are neutralized in combustion chamber; total fuel flow is bifurcated; first fuel flow is mixed up with flue gases supplied to combustion chamber and second one is conveyed to combustion-chamber burners wherein it is burned in air environment and then passed to combustion chamber. Coke gas, flue gas, or blast-furnace gas, or generator gases, or mixture thereof can be used as fuel; total flowrate of flue gases (B"_G) at combustion chamber outlet, total flowrate of fuel (B_F) supplied to combustion chamber, flowrate of air (B_A) supplied to combustion chamber, and flowrate of fuel (B_F ^BRN) supplied to burners are found from following set of equations (1), (2), (3), (4):

, where B'_G is flowrate of flue gases from combustion chamber outlet, kg/h; T'_G is temperature of flue gases at combustion chamber inlet, °C; O'₂ is oxygen content in flue gases at combustion chamber inlet, %; C'_G is heat capacity of flue gases at combustion chamber inlet, kcal/kg; B"_G is total flowrate of flue gases at combustion chamber outlet, kg/h; B_F is total flowrate of fuel supplied to combustion chamber, kg/h; B_F ^BRN is fuel flowrate to burners, kg/h; Q_F ^L is fuel low heating value as fired, kcal/kg; O₂" is oxygen content in flue gases at combustion chamber outlet, %; V_A ^O is theoretical air flowrate for burning 1 kg of fuel, kg/h; B_A is air flowrate to combustion chamber, kg/h; T_G" is gas temperature at combustion chamber outlet, °C; C_G" is heat capacity of flue gases at combustion chamber outlet, kcal/kg; α is excess air coefficient. Temperature within combustion chamber is maintained between 850 and 1150 °C.

EFFECT: enhanced efficiency of flue gas neutralization in fuel-burning units.

1 cl, 1 dwg, 3 tbl, 1 ex