Study On Regression Method Of Kinetic Parameters For Catalytic Cracking Reaction Under Non Plug Flow Assumption

Riser reactor is generally used in petro-chemical industry.The modelling of riser reactors is essential in the steady operation and optimization in fluid catalytic cracking and catalytic pyrolysis units.The distribution of flow of gas-solid two phase is uneven in the riser reactor.In the development of traditional lumped kinetic model,dynamic model parameters are derived in the 1-D model under the assumption that both vapor and catalytic phases are plug flow,without considering flow,which cannot more accurately simulate the riser reactor.In this paper,a riser reactor of Heavy Oil Processing State Key Laboratory is the main research object.During the research of establishing flow reaction model for reaction process,main work was done as below:Based on the analysis of axial flow law of riser reactor,we get the lower dense phase zone height of riser reactor using particle entrainment model and then calculate the actual catalyst to oil ratio.Finally,the flow reaction model was determined and the corresponding model equations were deduced.Computational procedure and method to resolve kinetic parameters were established with MATLAB platform and Sequential quadratic programming method and then the program was modified and debugged.The reaction rate constants under three kind of temperatures and frequency factors,activation energy were further calculated.We can find that the average relative error of each lump is less than 10% by comparing the experimental data and the calculated results.The model considering the fluid flow is better than traditional lumped dynamic model by comparing the errors.The model parameters can better reflect the real reaction rule through the analysis of the reaction rate constant and activation energy.