Retrofit SCR System Gets EPA Verification

Nett Technologies announced that it has received U.S. EPA verification of its BlueMAX 100 Selective Catalytic Reduction (SCR) system for controlling NOx emissions from mobile nonroad medium- and heavy-duty diesel engines. The verification is one of the first for a retrofit SCR system issue under the EPA's Environmental Technology Verification (ETV) program, the company said.

Nett's BlueMAX SCR system uses a urea control strategy that relies on a NOx concentration measurement sensor positioned upstream of the SCR catalyst. Based on the NOx sensor signal, in combination with an engine mass air flow sensor and temperature sensor, the necessary urea dosing rate is calculated by the control algorithm.

The feed-forward NOx sensor-based control strategy is designed to enable the system to be ideal for retrofit applications in non-attainment areas or where specified regulations exist for reducing NOx, the company said. It can be installed on a wide range of diesel engines and no additional engine calibration is necessary, according to Nett, and a direct-fit design is intended to simplify installation.

Along with NOx, the BlueMAX system is also designed to control diesel particulate matter (DPM), hydrocarbons (HC) and carbon monoxide (CO). Verification testing using two test protocols - NRTC and eight-mode steady state test cycles – were conducted at the Southwest Research Institute. Test results indicated that the system reduced NOx by 68 to 70%, PM by 12 to 30%, CO by 87 to 94% and HC by 99 to 100%, Nett said.

The development and verification of the Nett BlueMAX 100 SCR system has been supported by the Texas Environmental Research Consortium (TERC).

Based in Mississauga, Ontario, Canada, Nett Technologies specializes in emission control products for engines, vehicles, and machinery used in the mining, material handling and construction industries. Its products include catalytic converters for diesel, natural gas, LPG, and gasoline engines, diesel particulate filters and fume diluters.

SOURCE: Nett Technologies