Retrofit emission technology
From Stage II to Stage V with emission technology
Principals are setting increasingly strict requirements with regard to emissions of construction machinery, especially for the emissions of soot and nitrogen oxides (NOX). Reason enough for Kraanbedrijf Nederhoff to look at possibilities to make the existing machinery more sustainable.
For an upcoming project, the emissions of a Liebherr LR1100 crane, equipped with a Stage II engine, had to be reduced to Stage V levels. Taking the application into account, DLS technicians and engineers searched for a fitting solution: a retrofit SCRT system. This solution was found in a retrofit SCRT system: a combination of a soot filter and SCR system.
The soot filter filters soot particles from the exhaust gas, and collects these in the filter. Subsequently AdBlue is injected, which mixes with the exhaust gasses. The SCR catalyst converts NOx into non-harmful substances by means of a chemical process. The soot filter is made of sintered metal, and uses active regeneration to clean itself. A sufficiently high temperature is required for the SCRT system to work well. This temperature is not always achieved when the crane is in operation. In order to obtain and maintain this temperature, the system is completely insulated, and equipped with a heating element.
The exhaust aftertreatment system functions independently of the engine management, and is controlled by an ACU (Aftertreatment Control Unit) combined with newly installed sensors. Based on the measurements of these sensors the ACU determines the amount of AdBlue that needs to be injected, and controls the heating element. All information is tracked real-time by the built-in telematics module. The crane’s location and current data can be checked remotely.
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