One-dimensional Calculation And Analysis Of Trapping And Regeneration Of Soot Traps

Diesel engines are widely used in today's industrialized production and life due to their high dynamics and high economic efficiency.However,the amount of particulates contained in exhaust gas is a serious threat to the environment and human health.It is a recent meteorological disaster"haze".The main source of the diesel engine also puts forward new requirements for the emission of diesel engines.In particular,the Euro VI phase adds a limit to the particulate e missions of diesel engines.Diesel engine particulate trap DPF?Diesel Particular Filter?will become a diesel engine aftertreatment system.Required configuration.This paper establishes a DPF simulation model to explore its internal flow field,particle deposition characteristics,and pressure drop characteristics,which can provide theoretical support for improving DPF design work.A one-dimensional DPF model was established using AVL-Boost software and the model was tested and verified.Based on this model,the influence of DPF structural parameters and other factors on capture and regeneration was analyzed.The analysis and research conducted in this paper mainly include:1)The effects of different lengths,diameters,wall thicknesses,number of holes,length of inlet and outlet channels,and wall surface permeability on the trapping of DPF particles were investigated.The results showed that the longer the DPF length,the more gentle the pressure drop rise curve;the total pressure drop of DPF with the diameter The increase and decrease,when the DPF volume is constant,using a larger diameter is beneficial to reduce the total pressure drop of the DPF;the greater the DPF wall thickness,the greater the DPF pressure drop,but the DPF wall thickness has a smaller impact on the pressure drop Increasing the number of holes will increase the total pressure drop of the DPF.Decreasing the length of the holes entering and exiting the hole will reduce the total pressure drop of the DPF.The total pressure drop of the DPF decreases with increasing wall permeability.2)The effects of O₂ concentration,regeneration temperature and temperature increase mode on the regeneration of DPF were studied under O₂ regeneration mode.The results showed that the oxygen concentration had little effect on the regeneration of DPF;the higher the heating temperature,the earlier the start time of regeneration reaction and the regeneration reaction.The faster the rate,the shorter the required life time.3)Study the influence of NO₂ concentration,regeneration temperature and inlet flow rate on the regeneration of DPF under NO₂ regeneration mode.The results show that:NO2 concentration has a significant effect on CO,CO_2,NO concentration and the removal rate of particulates,the greater the concentration of NO₂,The faster the regeneration reaction rate,the shorter the reaction time and the better the regeneration effect;The regeneration temperature has little effect on the CO,CO₂,NO and NO₂concentrations and the removal rate of the total particulate pressure drop;the larger the intake flow rate,the unit time The greater the flow of NO ₂,the higher the NO₂involved in the oxidation reaction of the microparticles,so that the more particulates are removed,the shorter the regeneration time.