Could 'AdBlue conversion technology' save diesel? - Garage Wire

An industry-first technology developed by Loughborough University has the potential to significantly cut nitrogen oxide (NOx) emissions in diesel engines. The ammonia creation and conversion technology (ACCT) created by academics from the University’s School of mechanical, electrical and manufacturing engineering effectively increases the capacity of existing on engine after treatment systems. Currently, almost all new diesel vehicles are fitted with a selective catalytic reduction (SCR) system to try and remove NOx produced by combustion. This system uses AdBlue to safely provide the ammonia required to reduce NOx into harmless nitrogen and water. However, AdBlue only functions well at high exhaust temperatures, typically in excess of 250°C. Therefore, the SCR does not necessarily operate at all engine conditions, for example, during short, stop-start commutes, particularly in urban areas or on construction sites. What’s more, use of AdBlue at these problematic lower temperatures can result in severe exhaust blockages and subsequent engine damage. AdBlue conversion technology ACCT is an AdBlue conversion technology that uses waste energy to modify AdBlue to work effectively at these lower exhaust temperatures. By greatly extending the temperature range at which SCR systems can operate the new technology significantly enhances existing NOx reduction systems. Loughborough’s Professor Graham Hargrave, an internationally acclaimed expert on the optimisation of combustion engines, developed the technology with Research Associate Jonathan Wilson. Professor Hargrave said: “Unfortunately with many vehicles doing short stop/start journeys, such as buses and construction vehicles, many engines never reach the optimal temperature required for the SCR systems to operate efficiently. Engine temperature “The result is excessive NOx being released into the urban environment, especially in large cities. “Our system enables the SCR systems to work at much lower temperatures – as low as 60ºC.” Currently the Loughborough technology has been tailored for HGV’s, however the same system is fully scalable for use in all diesel vehicles. The Energy Technology Institute’s (ETI) chief technology officer for heavy duty vehicles, Chris Thorne said: “Based upon a brief review, the ACCT technology recently developed by Loughborough has the potential to viably produce gaseous ammonia at temperatures significantly below 190°C, thus enabling increased conversion efficiency and lower NOx emissions. “It is likely that emissions legislation will become even tighter and VMs will need to develop technologies to address this, and it is our belief that the ACCT technology should be further developed as it could help address this challenge in the real world.” Diesel demonisation In 2015 the Government estimated that exposure to NOx and particulate matter emissions from diesel engines lead to around 52,000 additional deaths in the UK. NOx emissions are also the primary cause of smog in major cities around the world and a growing public health concern. This has led to growing pressure on VMs to reduce engine emissions, with new European NOx reduction targets for on-highway and heavy-duty diesel vehicles now so low they are almost impossible to meet. Share your comments and opinions below.

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