A METHOD OF DETERMINING A CARBURISATION MODEL OF A COIL OF A STEAM CRACKUNG FURNACE

The present invention relates to a method of determining a carburisation model of a coil of a steam cracking furnace, wherein a carbon gas is led through the coil during operation of the steam cracking furnace, wherein in a carburised portion of a wall of the coil, especially an inner part of the wall facing the carbon gas, carburisation of a material of the wall occurs, wherein a first relation characterises a depth of the carburised portion in dependence of time and further in dependence of a growth parameter, wherein a second relation characterises the growth parameter in dependence of a temperature and further in dependence of at least one, especially two, material specific constant, wherein the method comprises the steps of: determining (211, 213), especially measuring, reference temperature values at reference positions of a wall of a reference coil during operation of a reference steam cracking furnace comprising the reference coil; determining (214), especially measuring, reference carburised portion values of a depth of a carburised portion at the reference positions of the wall of the reference coil at a reference point in time; determining (221) the at least one material specific constant in dependence of the first relation and the second relation and further in dependence of the reference temperature values and the reference carburised portion values; and determining (222) the carburisation model of the coil in dependence of the determined at least one material specific constant and further in dependence of the first relation and the second relation, the carburisation model characterising the depth of the carburised portion of the coil of the steam cracking furnace at a specific position of the wall of the coil in dependence of time and in dependence of a temperature at the specific position of the wall of the coil. La présente invention concerne un procédé de détermination d'un modèle de carburation d'une bobine d'un four de vapocraquage. Dans ledit procédé, un gaz de carbone est amené à traverser la bobine pendant le fonctionnement du four de vapocraquage; dans une partie carburée d'une paroi de la bobine, en particulier une partie interne de la paroi faisant face au gaz de carbone, la carburation d'un matériau de la paroi se produit; une première relation caractérise une profondeur de la partie carburée en fonction du temps et en outre en fonction d'un paramètre de croissance, une seconde relation caractérise le paramètre de croissance en fo