PLANT FOR THOROUGH UTILIZATION OF WASTE GAS HEAT AND METHOD OF AVOIDANCE OF CONDENSATION IN TAIL SECTION OF GAS DUCT Russian patent published in 2005 - IPC

FIELD: energy saving of fuel equipment; heat-power engineering.

SUBSTANCE: thorough utilization of waste gas heat is performed by cooling waste gases by external heat-transfer agent to temperature below temperature of beginning of condensation of water steam contained in them followed by preheating the partially dehydrated gases for forming temperature reserve by dry heat of hot gas of initial composition in recuperative gas-to-gas heat exchanger at artificially increased temperature head on side of heating gas relative to temperature of heating surface at inlet of gas being heated which is sufficient for evaporation of water carried by this gas; for obtaining the heating gas of initial composition at preset temperature potentials and quantity, use is made of devices for taking and carrying the gas flows of different parameters to heat exchangers, either separately or in mixture. Method of avoidance of condensation consists in minimization of temperature gradient between sections of heating surface, maintaining its temperature level and supplying heat to it sufficient for evaporation of water carried by gas being heated; temperature head is ensured by increase of heat transfer coefficient to heat exchange surface on side of heating gas as compared with heat transfer coefficient from wall and moisture precipitated on it relative to gas being heated due to increase of ratio of hot gas velocity to velocity of gas being heated.

EFFECT: rational and complete utilization of heat; enhanced operational reliability of gas duct.

5 cl, 1 dwg