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NUMERICAL SIMULATION



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NUMERICAL SIMULATION OF ENERGY RECOVERY INCINERATORS c A KODRES Mechanical Systems Division Naval Civil Engineering Laboratory Port Hueneme California ABSTRACT A mathematical model is developed to simulate the dual combustion chamber energy recovery incinerator The key to the model is the analysis of the incinerator by components conservation of energy is applied to the flame and primary combustion chamber secondary com bustion chamber and heat exchanger in sequence to pre dict temperatures and heat transfer rates throughout the system Application of the model is illustrated by using it to conduct a limited parametric examination of this type of incinerator The importance of combustion air control and heat exchanger performance is demonstrated qFLAME qPCC energy liberated to the primary combustion chamber T temperature t T temperature relative to the reference temperature t T T TREF fJ a NOMENCLATURE A surface area BD blowdown specific heat Cp 1 hCONV t h 1 K q efficiency viscosity Stefan Boltzmann constant refers to incinerator ash AVe COND average value by conduction heat transfer CONY DRY FEED mass flow rate FLAME refers to incinerator flame molar coefficients FUEL temperature T enthalpy at temperature enthalpy at TREF T relative to thermal conductance logarithmic mean overall temperature difference through n12 T ASH at LMTD nJ emissivity at temperature refers to airflows combustion or leakage as applicable coefficient of thermal conductivity AIR k M overall heat transfer coefficient of heat exchanger Subscripts convection heat transfer fUm coefficient energy liberated to the flame heat flux 178 by convection heat transfer refers to fuel waste conditions with all moisture removed refers to feed water entering the heat exchanger refers to the waste fed into the incinerator F W G W from the flame to the combustion available site have increased pushing up the cost of land products gases ml disposal The oil crises have created an awareness of from the flame to the



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