Two-stroke large diesel engine, exhaust valve and cylinder head for it, as well as production, operation and use of an internal combustion engine

摘要

Two-stroke large diesel engine, with at least one by a cylinder (1) and a cooperating with a crankshaft piston (3) combustion chamber (2), which at least one each between a valve plate (8, 108, 308) of an exhaust valve (9, 109; And at least one charge air inlet (4), the exhaust valve (9; 109; 309) being operable between an open position and a closed position and wherein the fuel gas outlet (20; 120; 320; 420) is connected to at least one exhaust duct (11) and to at least one fuel gas scavenging duct (18; 118a, 118b; 318,318a; 418,418a) to form part of one due to combustion of the combustion gas to the charge air inlet (4), characterized in that it has a throttle (10; 110; 310) fixed to or integral with the exhaust valve (9; 109; 309) seen in which one of the closed position of the exhaust valve (9; 109; 309) does not prevent the flow of fuel gas into the exhaust passage (11) to a desired opening degree, but throttles more than that in an exhaust port opening area of the exhaust valve reaching from a larger opening degree to the open position (9; 109; 309) in which the throttle means (10; 110; 310) does not throttle or at least less strongly restrict the flow of fuel gas into the exhaust passage (11), the throttle means (10; 110; 310) and an exhaust side branch 118a, 118b, 318, 318a, 418, 418a) are arranged to each other such that the throttle means (10; 110; 310) in the fuel gas scavenging port region, the flow of fuel gas into the fuel gas scavenging passage (18; 118a, 118b; 318 , 318a, 418, 418a) does not throttle at all or not significantly.