tu berlin

After the approval, HUSS project head, Christian Reinert, was highly pleased: “We have the competence to retrofit all applications of whatever power and master projects, which are nearly plant engineering.”

Four gen-sets in four different buildings of the time-honored Technical University (TU) of Berlin had to be retrofitted with Diesel Particulate Filters. HUSS is the only producer of particulate filters offering 6 different regeneration strategies. This means that for every application and exhaust gas temperature the optimal filter system can be integrated. A stationary gen-set running at a stable rpm, which leads to constantly high exhaust gas temperatures means a particulate filter with Catalytic Coating (MC system) can be installed. 

A real challenge for the dimensioning of the particulate filters was partially the large size, up to 831 hp, and the age of the engines (years of construction 81, 82, 86 and 93), which means high soot emissions. One criteria of the submission was the requirement not to exceed the low exhaust gas backpressure of 60 mbar. Additionally, a high noise reduction rate must be achieved, so the mufflers must stay in the exhaust system partially. This makes the backpressure specification of 60 mbar more difficult, because an additional muffler raises the backpressure. 

HUSS project engineer, Frank Simon, solved these challenges using modern CAD techniques and CFD (computational fluid dynamics) simulations of the exhaust gas flow. In the next phase of the project planning, a concept for the installation was created. This means key questions must be answered such as where to place the filter systems, how to change the exhaust gas routing, and which subcontractors (welding experts, suppliers for additional parts, etc.) are needed. During the process the subcontractors like; welding experts, electricians for the required security bypass and the specialist for industrial insulations were integrated into the project from the beginning. For three of four engines the installation solution was a special construction, with the filter systems hanging down from the roof. For backpressure control and steering of the exhaust-gas bypass flap a completely customized and freely programmable device was used.