Pre-DPF water injection technique for pressure drop control in loaded wall-flow diesel particulate filters

Abstract

ElsevierBermúdez Tamarit, VR.; Serrano Cruz, JR.; Piqueras Cabrera, P.; Garcia Afonso, O. (2015 AbstractWall-flow type diesel particulate filter (DPF) is a required aftertreatment system for particle emission abatement and standards fulfilment in Diesel engines. However, the DPF use involves an important flow restriction, especially as the substrate gets soot and ash loaded. It gives as a result the increase of the exhaust back-pressure and hence a fuel consumption penalty. The increasing damage of fuel consumption with DPF soot loading leads to the need of the regeneration process. Usually based on active strategies, this process involves an additional fuel penalty but prevents from excessive DPF pressure drop and ensures secure soot burnt out.Under this context, new solutions are required to improve the state of the art DPF soot loading to pressure drop ratio. This paper presents a novel technique based on pre-DPF water injection to reduce the DPF pressure drop under soot loading conditions by disrupting its dependence on soot/ash loading. It provides benefits to engine fuel economy and also higher flexibility for DPF regeneration and maintenance. The work covers a test campaign performed in a passenger car turbocharged Diesel engine equipped with a wall-flow DPF. The main objective is to describe the technique, to provide a figure of its potential for pressure drop control and fuel consumption reduction. The results of the experiments also confirm soot and ash loading capacity increase and demonstrate the lack of negative effects on filtration efficiency and active and passive regeneration.

The state-of-the-art of soot load estimation in diesel particulate filters: A review

“…Bermúdez et al [39] applied a one-dimensional wall-flow DPF model to discussed the dependence of pressure drop, and hence the fuel consumption penalty, on the emitted particle matter distribution (both soot and ash) and the porosity of the particulate layer. Different soot mass distributions along the inlet channels were analyzed via pre-DPF water injection as a technique able to reduce pressure drop so that the baseline DPF was independent of PM loading and their influence on the subsequent soot loading process could be assessed [40]. Figure 16 showed the DPF pressure drop as a function of the particulate layer porosity and the soot mass distribution onset.…”

Review on Post-Treatment Emission Control Technique by Application of Diesel Oxidation Catalysis and Diesel Particulate Filtration

“…It can be reduced if ash is deposited in the rear part of the inlet channel. A novel technique on pre-DPF water injection was proposed in [57], where the redistribution of accumulated soot particles was carried out by dragging the particles with the help of water to the end of the inlet channel. But it was observed that the injection of water will reduce the temperature at inlet and outlet of the DPF.…”

Numerical analysis on a novel CGPFs for improve NOx conversion efficiency and particulate combustion efficiency to reduce exhaust pollutant emission

“…First, the exhaust gas generated during the vehicle load process enters the catalytic converter (Zhang et al 2016). When the catalytic converter is working, the HC and CO of the exhaust gas are purified, and NO is converted into NO2 (Bermudez et al 2015;E et al 2020).…”