Cummins Inc.

Alstom Technology Limited

Cummins Emission Solutions Inc.

Zheng Liu

Aleksey Yezerets

Neal W Currier

J Stephen Wills

Arvind V Harinath

Yi Liu

Qiang Liu

Naresh B Handagama

Michael Haas

Andrew W Osburn

Joan M Wills

Rahul B Kallurwar

Ying Yuan

Abdul R Ofoli

Justin Kruer

Nareshkumar B Handagama

Alan W Ferguson

Huiling Li

A process for recovering performance of a component of an aftertreatment system. The component includes an inlet and an outlet. The inlet is positioned upstream relative to an exhaust gas flow through the aftertreatment system, and the outlet is positioned downstream relative to the exhaust gas flow through the aftertreatment system. The process includes removing the component from the aftertreatment system. The process also includes regenerating the component, such as subjecting the component to an acid wash and/or heat treating the component. The process further includes reinstalling the component into the aftertreatment system with the inlet positioned downstream relative to the exhaust gas flow through the aftertreatment system and the outlet positioned upstream relative to the exhaust gas flow through the aftertreatment system.

Component performance recovery via inlet and outlet swap

A timing-based method for regenerating a DOC included in an aftertreatment system fluidly coupled to a dual-fuel engine comprises performing at least one of the following: a temperature of the DOC is varied while flowing a mixed exhaust gas, which comprises a mixture of a diesel-only exhaust gas and a natural gas exhaust gas, generated by the dual-fuel engine through the DOC; alternately the method includes flowing (a) the mixed exhaust gas generated by the dual-fuel engine and (b) a diesel-only exhaust gas generated by the dual-fuel engine through the DOC.

Systems and methods for regeneration of a diesel oxidation catalyst in a dual-fuel engine

Catalyst diagnostic limit parts and methods for making catalyst diagnostic limit parts are disclosed. An exemplary catalyst diagnostic limit part includes a substrate and a washcoat coating the substrate. The washcoat includes an active catalyst and an inactive catalyst at a predetermined ratio of active catalyst to inactive catalyst so as to control the performance of the catalyst diagnostic limit part.

System and method for creating catalyst OBD limit parts for exhaust aftertreatment applications

An aftertreatment system including a method which provides a selective catalytic reduction (SCR) catalyst disposed in an exhaust stream of an engine; determines that an ammonia pre-load condition for the SCR catalyst is present; determines a first amount of ammonia pre-load in response to the ammonia pre-load condition; injects an amount of ammonia or urea into the exhaust stream in response to the first amount of ammonia; and adsorbs a second amount of ammonia onto the SCR catalyst in response to injecting an amount of ammonia or urea, where the second amount of ammonia is either the injected amount of ammonia or an amount of ammonia resulting from hydrolysis from the injected amount of urea.

System and apparatus for enhancing exhaust aftertreatment startup emissions control

An exhaust aftertreatment process including providing a selective catalytic reduction (SCR) catalyst disposed in an exhaust stream of an internal combustion engine; determining that a temperature of the exhaust stream is not within an NHbased SCR range; and providing an amount of unburned hydrocarbon (UHC) to the SCR catalyst in response to the temperature of the exhaust stream not being within an NHbased SCR range.

[object Object]

One embodiment is a method including operating an SCR system at a plurality of commanded ammonia to NOx input ratios, providing a plurality of data indicating NOx output from the SCR system for the plurality of commanded ammonia to NOx input ratios, and evaluating the plurality of data to diagnose the SCR system. Additional embodiment are methods, systems, and apparatuses including SCR diagnostics. Further embodiments, forms, objects, features, advantages, aspects, and benefits shall become apparent from the following description and drawings.

Methods, systems, and apparatuses of SCR diagnostics

A solvent based flue gas processing system for removing COfrom a flue gas stream is described. A catalyst is provided to increase the efficiency of the solvent in capturing COfrom the flue gas stream or in regenerating the solvent.

A solvent based flue gas processing system for removing COfrom a flue gas stream is provided in which a catalyst coated on a support structure is provided. The catalyst selected is capable of retaining CO, at least for a period of time, thereby increasing the residence time of COand solvent.

A system () for removing carbon dioxide from a process gas generated during the combustion of a fuel comprises at least one absorption vessel () through which the process gas may be forwarded. The absorption vessel () is provided with a sorbent material () which is operative for reversibly collecting carbon dioxide from the process gas being forwarded through the sorbent material (). The sorbent material () comprises at least one amine, at least one carbon dioxide activating catalyst, and at least one porous material supporting the at least one catalyst and the at least one amine.

Growing community of inventors

Knoxville, TN, United States of America

Zheng Liu