Simulation modeling of black liquor combustion subsystem in a recovery boiler furnace

A simulation model of the subsystem for black liquor burning in the recovery boiler furnace has been developed to effectively address problem of obtaining target products resulted from black liquor combustion – sodium carbonate and sodium sulfide. The model developed enables the following processes to be simulated: black liquor combustion: to study influence of black liquor composition, air flow rate, temperature and other factors on the recovery boiler efficiency; sodium sulfate reduction: to study the influence of temperature, gas composition and carbon content on the rate of sodium sulfate reduction to sodium sulfide in the recovery boiler. Application of the simulation model allows optimizing the combustion process, minimizing pollutants emitted into the air, diminishing the use of resources and the generation of waste, and increasing the overall efficiency of the regenerative cycle.