The Modeling and Simulation of the Convection Section of the Atmospheric Distillation Plant Heaters

摘要

The paper presents the research results of the design and adaptation of the mathematical model destined to convection heater zone simulation of the crude unit plant. The paper is structured in four parts: the convection heater zone structure, the heat transfer model of inside and outside tubes, the model adaptation and numerical simulation. In the first part there is treated the system of the convection heater zone of the tubular heater. Also there have been identified the input and output variables. The convection heater mathematical model is based on thermal balance equations and newton's law. For the model adaptation process there have been identified four constant types: heater geometrical constants, fuel constants, heated flow constants and burn gases constants. To calculate the heated flow constants there have used two methods. First method uses the empirical relations and the second method uses the Unisim Design (R) simulator. The comparison between the numerical simulation results and the design data there has validated the proposed model. There has been studied the crude oil properties estimation method influence to simulation results. The study has permitted the convection heater zone statically input-output characteristics prediction.