L'Orange Introduces New NOx Treatment System

L'Orange has introduced L’ONOX, a new concept in the field of exhaust after-treatment for large marine, offshore, power plant and railway engines. With this innovation, the subsidiary of Rolls-Royce Power Systems, is providing an important component for compliance with the strict emission limits for large engines beginning in 2016. 

The IMO Tier III and EPA Tier IV emission regulations, which will come into force in 2016, represents a challenge for all manufacturers of large engines. However, the development department at L'Orange is supporting engine manufacturers with the required reduction of nitrogen oxides with an innovative solution in the exhaust after-treatment process. 

The third emissions stage of the IMO legislation calls for a reduction to approximately two grams of NOx per kilowatt hour. To meet this requirement, derivatives from the truck sector for dosing urea-water solutions are mostly used for after-treatment. 

With L'ONOX, L'Orange provides an in-house, customized solution for all manufacturers of large engines operating in a range of industrial sectors, including marine, offshore, land-based power generation and rail.

“Exhaust after-treatment is often the only way to significantly reduce emissions, since manufacturers have usually already reached the limit of the possibilities inside the engine,” says Dr. Schmidt, CEO of L'Orange. 

L'ONOX injects a urea-water solution at a pressure of about 10 bar into the exhaust system through several dosing units. To ensure accurate dosage amounts, the L'ONOX system’s electronic components continuously monitor the signals from the integrated pressure and temperature sensors. True to the proven common-rail principle, several injection units are supplied by a single delivery unit. 

The precise injection process ensures optimal mixing of the urea-water solution in the exhaust system. This supports the efficient reduction of nitrogen oxides into nitrogen and water in the SCR catalytic converter. 

“The greatest advantage of our system is the flexibility L'ONOX offers. Our product can be adapted to the specific engine requirements of our global customers. So we can now offer an injection concept in exhaust after-treatment that is not restricted to certain engines,” adds Dr. Schmidt. Thanks to long maintenance intervals and L'Orange’s proven remanufacturing principle, L'ONOX also delivers favorable lifecycle costs. Under certain conditions and in combination with an SCR catalytic converter, installing a L'ONOX system is also possible in older engine models. 

L'ONOX bridges the gap between the injection of diesel or heavy fuel oil and the subsequent treatment of the resulting emissions. Backed by decades of experience in injection technology, L'Orange has succeeded in transferring this knowledge to exhaust after-treatment. L'ONOX combines modular flexibility with robust design and high-precision dosing of urea, without the additional need for compressed air. The system architecture is therefore considerably simplified.