Diesel Vaporizer: An Innovative Technology for Reducing Complexity and Costs Associated with DPF Regeneration

Chiew, Lee; Kroner, Peter; Ranalli, Marco

doi:10.4271/2005-01-0671

Cited by 25 publications

(3 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Tan et al [102] increased the DOC outlet temperature to 550 • C via a late post injection technology, but raising the DPF inlet temperature in that way was accompanied by worsening fuel consumption [103]. The diesel vaporizer system was to introduce diesel into the DOC to intensify the oxidation heat release of the DOC [104], which enabled the DOC outlet temperature to reach 650 • C rapidly, with a fuel consumption reduction of 50%. Utilizing the HC tailpipe injection could reduce extra fuel consumption.…”

Section: Dpf Thermal Managementmentioning

confidence: 99%

A Review of Thermal Energy Management of Diesel Exhaust after-Treatment Systems Technology and Efficiency Enhancement Approaches

Wu,

Feng,

et al. 2024

Energies

View full text Add to dashboard Cite

The DOC (diesel oxidation catalyst), DPF (diesel particulate filter), SCR (selective catalytic reduction), and ASC (ammonia slip catalyst) are widely used in diesel exhaust after-treatment systems. The thermal management of after-treatment systems using DOC, DPF, SCR, and ASC were investigated to improve the efficiency of these devices. This paper aims to identify the challenges of this topic and seek novel methods to control the temperature. Insulation methods and catalysts decrease the energy required for thermal management, which improves the efficiency of thermal management. Thermal insulation decreases the heat loss of the exhaust gas, which can reduce the after-treatment light-off time. The DOC light-off time was reduced by 75% under adiabatic conditions. A 400 W microwave can heat the DPF to the soot oxidation temperature of 873 K at a regeneration time of 150 s. An SCR burner can decrease NOx emissions by 93.5%. Electrically heated catalysts can decrease CO, HC, and NOx emissions by 80%, 80%, and 66%, respectively. Phase-change materials can control the SCR temperature with a two-thirds reduction in NOx emissions. Pt-Pd application in the catalyst can decrease the CO light-off temperature to 113 °C. Approaches of catalysts can enhance the efficiency of the after-treatment systems and reduce the energy consumption of thermal management.

show abstract

Section: Dpf Thermal Managementmentioning

confidence: 99%

A Review of Thermal Energy Management of Diesel Exhaust after-Treatment Systems Technology and Efficiency Enhancement Approaches

Wu,

Feng,

et al. 2024

Energies

View full text Add to dashboard Cite

show abstract

“…However, this extra fuel system has its own challenges, such as additional cost, uncertainty in the degree of fuel vaporization, its homogeneity in the exhaust stream, and flow maldistribution. Owing to the high boiling temperature of diesel fuel, an auxiliary heating device such as a fuel vaporizer may be considered to assist fuel vaporization in extra fuel system, which may mitigate expected issues on fuel vaporization and homogeneity in the exhaust [23]. Optimization of the design of the catalyst inlet diffuser is also considered to improve flow maldistribution to obtain better oxidation performance [24].…”

Section: Combustion Mode Comparison For Performing the Heat-up Doc Functionmentioning

confidence: 99%

Characterization of heat-up diesel oxidation catalysts through gas flow reactor and in-situ engine testing

Han

Assanis

Bohac

2008

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

This study characterizes the performance of several diesel oxidation catalyst (DOC) formulations with respect to their ability to heat up engine exhaust for the purpose of regenerating a diesel particulate filter or desulphating a lean nitrogen oxide (NO x ) trap. Platinum (Pt), platinum-palladium (Pt-Pd), and platinum-palladium + cerium oxide (Pt-Pd + CeO 2 ) are characterized using gas flow reactor experiments and in-situ engine tests. The feed gas from conventional diesel combustion and the feed gas from low-temperature premixed charge compression ignition (PCI) combustion are compared. An in-cylinder post-injection strategy is used to add the chemical energy needed to support DOC exothermic reactions, and the effect of post-injection timing is studied. The effects of carbon monoxide (CO), hydrocarbon (HC), and oxygen (O 2 ) partial pressures on light-off characteristics are also investigated.Reactor tests show that Pt-Pd exhibits the lowest light-off temperature, followed by Pt-Pd + CeO 2 and then Pt, regardless of mixture composition and O 2 concentration. In-situ engine tests demonstrate that PCI is superior to conventional combustion in increasing the exhaust gas temperature at the same post-fuel-injection quantity, but only if the exhaust gas temperature is high enough to oxidize HCs and CO in lieu of sufficient O 2 . However, PCI produces significant particulate matter (PM) as post-injection timing is retarded. To avoid an increase in PM emission, an alternative method to introduce fuel should be considered.

show abstract

“…In particular, to control the amount of HC slip and its thermochemical effect on DPF active regeneration, the control logic of improving the fuel dosing 17 and the pulsed EFI concept 18 were introduced. Particularly, pulsed EFI methodology was intensively studied as a possible solution for preventing DPF uncontrolled regeneration.…”

Section: Introductionmentioning

confidence: 99%

Modeling uncontrolled regeneration of diesel particulate filters, taking into account hydrocarbon slip

Lee

Rutland

2012

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

The effect of hydrocarbon slip from a diesel oxidation catalyst on active regeneration of a diesel particulate filter is investigated by developing a generalized zero-dimensional diesel particulate filter model to predict the wall temperature of the diesel particulate filter and the trapped mass of particulate matter. Exhaust fuel injection methodology is applied to provide a high temperature for regeneration by oxidation in the diesel oxidation catalyst. However, the diesel oxidation catalyst reactions may be incomplete and hydrocarbon slip can occur. It is confirmed that two exothermic reactions, namely soot oxidation and hydrocarbon oxidation, which proceed simultaneously may result in the synergistic effect of a rise in the temperature. This is primarily because the temperature is the common factor that affects both reaction rates, i.e. a rise in the temperature caused by one reaction can affect the increase in the reaction rate of another reaction through the exotherms created. Accurate prediction of the temperature rise during active regeneration of the diesel particulate filter is dependent on several crucial factors: the initial wall temperature of the diesel particulate filter, the inlet temperature of the diesel particulate filter, the initial loading level of particulate matter, the exhaust mass flow rate, the oxygen concentration, and hydrocarbon slip. Several simulations revealed that hydrocarbon slip can be one of the reasons for uncontrolled regeneration of the diesel particulate filter. It is concluded that, if there is a considerable amount of hydrocarbon slip, then uncontrolled regeneration of the diesel particulate filter easily occurs when the exhaust mass flow rate is rapidly reduced to the idle condition during regeneration. Flow transient simulations also confirmed that the temperature ramp-up rate and the point of time when the exhaust mass flow rate is reduced determine the overall trend of the temperature rise and the characteristics of the thermal behavior of the diesel particulate filter.

show abstract

Diesel Vaporizer: An Innovative Technology for Reducing Complexity and Costs Associated with DPF Regeneration

Cited by 25 publications

References 2 publications

A Review of Thermal Energy Management of Diesel Exhaust after-Treatment Systems Technology and Efficiency Enhancement Approaches

A Review of Thermal Energy Management of Diesel Exhaust after-Treatment Systems Technology and Efficiency Enhancement Approaches

Characterization of heat-up diesel oxidation catalysts through gas flow reactor and in-situ engine testing

Modeling uncontrolled regeneration of diesel particulate filters, taking into account hydrocarbon slip

Contact Info

Product

Resources

About