About CRI's Selective Catalytic Reduction (SCR) System

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

boiler picture

Boilers / Turbines

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

Furnace / Heaters

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.

Waste incinerations / Biomass

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 & chemical processes

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.

Chemical processes

Enhanced ammonia adsorption accommodates changing flue gas streams and composition (e.g, high NO2 concentrations) while exceeding performance requirements.

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