Research Of Fuel Assisted Regeneration Characteristics For Diesel Particulate Filter

One of the main pollutants in diesel emissions is particulate matter.The most effective techniques to remove particulate matter is to install the collection efficiency up to 90% of the wall-flow particulate trap,trap particulate material issues have been resolved,but the regeneration technique restricts its application prospects.Analyze the effect of regeneration properties on particulate filter and develop regeneration control strategies on the basis have great significance.First,particulate trap trapping mechanism and pressure drop characteristics simulation method,and fuel assisted regeneration process simulation method introduced in detail.For the study of particulate trap and pressure drop characteristics of particulate trap fuel assisted regeneration process provides a theoretical basis,and also provides a clear direction for making a regeneration control strategy.Secondly,study the regeneration conditions such as soot deposition mass,exhaust gas mass flow rate,oxygen concentration in the exhaust gas,exhaust gas temperature,and ash deposition are how to effect the regeneration process.Research indicates: The larger the regeneration of soot deposited amount,the average temperature of the particulate trap regeneration,the greater the value of the local maximum temperature;High exhaust gas mass flow rate oxide particles fast,making the average temperature of the carrier higher,but the high exhaust mass flow take away more heat has a cooling effect to the carrier;Oxygen concentration closely affects the particle oxidation rate,high concentration of oxygen in the particles oxidized faster,but higher concentration of oxygen make part of the particles are oxidized in advance,so that the carrier temperature drop;Ash deposition reduce the effective filter length of the filter carrier,increasing the pressure drop and regeneration temperature,the best time of the particulate trap regeneration is to advance.Finally,taking into account the carrier regeneration security and the impact of regeneration of the regeneration process,developed a regeneration control strategies.Including the use of GT-Power Injector build raised temperature combustion model,the raised temperature characteristics simulation analysis;the study rated conditions and lower idle condition regeneration particulate trap carrier is subjected to thermal shock,considering the support material is heated limit,determine the amount of carbon contained under the present study conditions for safe limit of 6g/L,and to determine the regeneration timing;in consideration of the safety of the heat carrier,to develop an appropriate rate of temperature rise;setting overheating protection mechanism to ensure the safety of the regeneration process may control.This paper analyzes the impact of soot deposition mass,exhaust gas mass flow rate,oxygen concentration in the exhaust gas,exhaust gas temperature,ash deposition regeneration of particulate trap regeneration fuel injection combustion process,the understanding of the particulate trap regeneration process has Significance.Based on the above study,developed a safe and reliable regeneration of particulate trap regeneration fuel injection combustion control strategy,in varying conditions still apply.