Structural Parameters Optimization And Flow Field Numerical Simulation Of LPH-1Feed Nozzle Internal

With the rapid development of heavy oil catalytic cracking technology,feedstock oil of catalytic cracking unit tend to be heavy.Practice shows that heavy oil catalytic cracking feed nozzle is one of the key equipment in catalytic cracking process. A superior performance of the feed nozzle can increase the yield of light oil, improve the distribution of products, reduce coke yield, increase economic efficiency; while blending residue or catalytic cracking of heavy oil as raw material, improve feed nozzle atomization performance, can also serve to improve the rate of mixed slag, reduce coking equipment, extending the role of plant operation cycle. By using computational fluid dynamics methods, the internal nozzle flow field is numerical simulation comprehensively, and some results have been made achievements.A physical and mathematical LPH-1of feed nozzle models has been established in this paper, and a boundary condition and initial conditions were confirm according to the field consists of liquid film and gas core, flow field simulation of two-dimensional array of feed nozzle has been conducted. The gas-liquid two-phase vector, the flow structure and the nozzle velocity, pressure drop, turbulent kinetic energy vector of the feed nozzle inside and so on are been given in the calculation results.By changing the structural parameters of the steam inlet diameter, the diameter of oil imports, oil injection angle and diameter of the nozzle outlet,set orthogonal table, then get9different sets of structural parameters, establish the model respectively, then numerical simulation. After that analysis and comparison the results of the calculation. A set of optimized parameters obtained by range analysis methods in modeling, numerical simulation, calculation results obtained. By observing, contrast flow field three sets of parameters (speed, pressure, turbulent kinetic energy), obtained that the optimizing and improved nozzle more good exit velocity it’s pressure increased, but the turbulent kinetic energy change is not significant.In this paper, heavy oil feed nozzle internal flow simulation results accumulate some experience in the field of, conclusions about flow field changes,which is caused by different structural parameters. At the same time,it can provides certain guiding value on atomizing nozzle design and some analysis, simulation of the flow field. General the nozzle model after optimization obtain good results in the exit velocity. However, due to numerical simulation, has its drawbacks:One is dependent on the reliability of the basic equations; Second, it needs flow parameters provided by the prototype observation or physical model experiments, and needs to be validated and calibrated model. Therefore, it has limitations if only use the method of numerical simulated, Therefore, the numerical calculation and theoretical analysis, observations and laboratory should be interrelated and mutually reinforcing, should be combined in order to solve practical engineering problems in a better way.