Bevel-helical gearboxes B4 d sizes In a normal scenario only one radial sha B4HH-7-C

Flender/Flender Gear Units/Bevel-helical gearboxes B4

ting at medium speeds in Mannheim In the case of stationary diesel engines, however, such breakthrough has yet to be achieved Even with the SCR process (Selective Catalytic Reduction with NH, injection into the exhaust gas), the target NO, value of 5 mg/m3 (5% 0,) cannot yet be guaranteed This gave riseas earlyas 1 -several years beforetheTechnical Directive on Air Pollution came into forceon 2 0 8-tothequestion ofwhetherexperiencewithgasenginescould bea pliedtopollut- ant minimisation in direct injection diesel en ines and, later - after final $finition of the dynamic clause - of whether the tightening ?the limit values to NO, = 5 instead of 2 or 4 mg/m3, (5% 0,) Dust = 5 ( instead of 1 mg/m3, (5 Yo 0,) could possibly be realised at all in direct-injection engines In extensive investigations, which initially concerned solutionsfor individual engineand design parameters, and then full-scale engine trials (TED 2 , it was roven for the firsttime that thetargetvaluesforN0,anddustcan beachievedunderfull load&,= 1bar,= 1Vmin) with the following package of measures Exhaust gas purification by particle filtration and regeneration Partial recirculation of the purified exhaust gases to the intake air Supercharging of the airlexhaust gas mixture lntercooling Optimisation of measures inside the engine Development of special control strategies The basic principles of this ,,diesel concept" correspond to those of the ,,homogeneous lean mixture superchar ing" of fourstroke spark ignition gas engines1 The fact that this diesel con- cept nevertheless 8oes not quite achieve the NO, emissions of the spark ignition gas principle is attributable to the following reasons the external formation of the mixture of spark ignition gas engines leads to intensive homogenisation of the mixture, which cannot, and must not be achieved during the internal formation of the heterogeneous diesel mixture (heat release peak) Exhaust gas recirculation has proven to be a