【作者】

Clemens Senghaas

【摘要】

该论文已在芬兰赫尔辛基举行的第28届CIMAC大会上发表。论文的版权归CIMAC所有。Due to the well-known reasons, such as the reduction of operating costs and emissions, the number of gas engines has increased a lot over the last years. Thereby Dual Fuel engines enable high flexibility and operating reliability. So unlimited engine operation is guaranteed, even if gas supply was interrupted. Furthermore gas operation with pilot injection also shows advantages in comparison to operation with spark plug, for example an increased ignition and lifetime. As global market leader for Dual Fuel injections systems L’Orange possesses more than 20 years of experience in research and development; both for engines with homogeneous combustion (low pressure gas) and also with heterogeneous combustion (high pressure gas). The appropriate engines from Wärtsilä convice on the market for many years. Despite many advantages the actual Dual Fuel injection systems show one disadvantage: they are complex and extensive and therefore need equivalent constructed size. Usually DF injection systems have two separated fuel circuits, one for pilot injection with gas operation and one for liquid fuel operation. This requires several pumps for pressurization, a double needle injector with a common rail and a pump line nozzle site respectively two separate injectors per cylinder. Currently L’Orange develops a new, obviously simplified injection system. The injection system consists only of one fuel circle with one high pressure pump plus one injector per engine cylinder. The injector possesses a one-needlenozzle, with which the pilot quantity and the full load in the fluid fuel operation are injected. Thereby challenges for the development are the realization of a stable injection quantity for the pilot injection at a sufficient fuel atomization - with the same nozzle respectively the same blowholes for the pilot- and main injection. To guarantee the required engine performance and emissions, the injection quantity has to remain stable for the whole lifetime which demands a closed control loop for drift compensation. Furthermore design-measurements are required to ensure the thermal balance of the high pressure pump and the nozzle in gas operation. Besides the design and simulation activities extensive tests on component test rigs and on the spray diagnostic rig at L’Orange plus on the engine were realized. These tests have provide good results, so first series operations are expected soon.

【会议名称】

第28届CIMAC会议

【会议地点】

芬兰 赫尔辛基

【下载次数】

4

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