Product category:
Gears, brakes, couplings and engines
News Release from: IMI Vision | Subject: Sigma direct gas injection
Edited by the Engineeringtalk Editorial
Team on 19 May 2005
Breakthrough claimed in engine NOx
reduction
A breakthrough in NOx reduction technology could mark the end of traditional selective catalytic reduction exhaust after-treatment.
IMI Vision, the innovation centre of the successful global engineering business IMI, has unveiled a significant breakthrough in NOx reduction technology, which could mark the end of traditional selective catalytic reduction (SCR) exhaust after-treatment The new Sigma direct gas injection technology, developed by IMI Vision, uses industry standard reductants and SCR catalysts without injecting urea solution into the exhaust pipe, to provide the end user with a significantly more responsive and increased fuel efficient engine, and an SCR NOx reduction system that is simple, low maintenance and user friendly
This article was originally published on Engineeringtalk on 4 Sep 2002 at 8.00am (UK)
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IMI Vision Managing Director, Martin Johnson, said: "The only viable SCR solutions used today to meet the Euro 4 emission regulations (effective September 2005) are based on droplet injection".
"They have potential limitations on NOx reduction performance and operation at low temperatures".
"Injecting an aqueous urea solution into an engine exhaust has the significant disadvantages of cold catalyst performance, sluggish response and catalyst saturation, and that's before considering the urea crystallisation deposits and other blockages".
"These blockages and solids can clog the entry face of the SCR catalyst and reduce its effectiveness".
"Purging requirements and cold cycle dosing also represent major hurdles for aqueous technology".
"The Sigma direct gas injection technology solves these problems by generating ammonia gas directly from the urea solution, before dosing the exhaust gas".
The simple, scaleable Sigma technology can be incorporated into exhaust systems, saving space and weight, and allowing more flexible packaging of exhausts for all sizes of engines, offering an innovative and cost-effective solution to commercial vehicles.
The system performs a controlled hydrolysis of the reductant using a device (patent pending) to produce a known-quality gas mix.
This gas, which contains high quality ammonia, is then injected in a controlled way to achieve a stochiometric NOx reduction.
The system uses thermal energy from the engine exhaust gas and requires minimal auxiliary energy for its peripheral subsystems.
It is designed to cope with the most demanding transient load conditions as well as being able to dose when the exhaust temperature is below 200C.
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