DeNOX - SCR Catalyst
CRI provides highly reliable technology for Selective Catalytic Reduction (SCR) of nitrogen oxides (NOx) from stationary and mobile combustion sources and chemical processes. Proven around the world, CRI SCR/Shell DeNOx System (SDS) catalyst technology is unique in its ability to provide high NOx reduction across a broad range of conditions. At low temperatures, it outperforms any other catalyst system, making it a highly cost-effective retrofit for existing facilities where exhaust temperatures are low.
The CRI SCR Catalyst System is based on the addition of ammonia (NH3) to the NOx-containing flue gas and passing the mixture over an active catalyst. This converts the nitrogen oxides (NO and NO2) to naturally occurring nitrogen (N2) and water (H2O). Together, our high-activity catalyst and low pressure drop result in cost-effective NOx reduction. CRI SCR technology is impressively cost-efficient compared to other NOx control technologies.
In addition, because of its LFR-based design, low-temperature activity and extremely low pressure drop, it delivers the performance you require while consuming less energy – supporting your facility’s overall energy reduction program. For certain applications, it can be installed between the economiser/HRSG and the stack, helping to reduce installation costs, plant downtime and disruption. Backed by the strength of Shell, the CRI SCR Catalyst System not only delivers powerful environmental and cost benefits, it also comes with the service and support you expect from a respected global leader.
Watch the Shell DeNox System video
Introduction & NOx
The world we live in today is full of amazing achievements most of which wouldn’t be possible without our strong industrial manufacturing infrastructure.
And while these plants and factories work hard to deliver the goods and services we depend on, we need to work equally as hard to minimize the emissions they can sometimes produce, our world depends on it.
That is where CRI comes in. Every day CRI Catalyst, a subsidiary of Royal Dutch Shell researches and implements new innovative ways to help make reducing emissions a reality.
And now through our revolutionary catalytic reduction process, businesses can continue to produce the goods we need while reducing air pollution and helping create safer and cleaner environments.
Discover all of the ways that CRI can help you play your part in ensuring a cleaner environment for us all.
Nitric oxide and nitrogen dioxide, collectively known as NOx, are notable pollutants primarily formed by fossil fuel combustion.
NOx exhaust is produced by a wide range of sources, from engines to turbines, waste incinerators, nitric acid production, and power plants to name a few.
Unfiltered, NOx emissions can lead to potentially harmful pollutants like Ozone, which can be detrimental to the environment, as well as contribute to respiratory problems like asthma.
But there is a way to help curb these effects.
Let’s look at an industrial boiler used to create steam for power generation. As the boiler produces steam it also creates exhaust containing NOx emissions.
In order to reduce these emissions, the Shell DeNOx System begins by injecting ammonia into the flue gas stream. The mixture then travels over a CRI High Activity Catalyst located in the Lateral Flow Reactor – or LFR. The NOx and ammonia react in the presence of the catalyst, converting the nitrogen oxides to naturally occurring nitrogen and water; reducing as much as 99% of NOx emissions.
The LFR used in the Shell DeNOx system, offers a low pressure drop technology for Selective Catalytic Reduction, and can greatly reduce NOx emissions across a broad range of conditions, especially in low temperature systems.
The Shell DeNOx System is a cost-effective and energy-efficient solution to help keep vital industries running cleaner, while helping people breathe easier.
For more information on the Shell DeNOx System, visit our website at cricatalyst.com
The Shell DeNOx System offers outstanding operational performance, including low ammonia slip, low pressure drop, tolerance against tube rupture and direct water contact.
Unlike alternative NOx control technologies, the CRI SCR Catalyst System does not disrupt turbine or heat-recovery equipment operation
For existing installations, no modifications to either the furnace or the heat recovery section are necessary. For new furnaces, the location of the CRI SCR Catalyst System helps maximise operational flexibility of the furnace.
The CRI SCR Catalyst System offers significant performance advantages over primary NOx reduction measures when low NOx emission levels are required.
High NOx removal capability at low temperatures allows the CRI SCR Catalyst System to be integrated at the end of flue gas treatment systems on waste incineration plants - with minimal or no gas reheat.
Enhanced activity allows catalysts to tolerate contaminated gas streams.
Nitric acid plants
The CRI SCR Catalyst System can be installed in either the high-pressure position upstream of the expander or in the low-pressure position downstream of the expander at very low oxygen concentrations.
Enhanced ammonia adsorption accommodates changing flue gas streams and composition (e.g, high NO2 concentrations) while exceeding performance requirements.
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