Method and engine for operating a large crosshead reciprocating piston internal combustion engine

Abstract

Disclosed is a large, crosshead reciprocating piston combustion engine comprising; at least one cylinder (2) surrounding a chamber (4) for combustion ; and a piston (3) bordered by each piston related to a rotatable output crankshaft (5) through a crosshead function means (7) that realizes combustion from the fuel directly supplied into the chamber during an operation cycle inside the chamber (4) and executes scavenging by introduction of a scavenging gas pressurized from the second end part toward the first end part of the cylinder (2); wherein combustion products occurring due to combustion are recirculated at least partially to reduce nitrogen oxide contents of an exhaust gas ; and the exhaust gas due to opening of an exhaust gas outlet (13) at the first end part of the cylinder (2) and the recirculated gas due to opening of a recirculated gas outlet (15) pass from the combustion chamber (4); and the recirculated gas outlet (15) is opened several times for each time of allowing a gas path during an operation cycle of internal combustion engines; which may cause a reduction in thermal stresses of a valve (16) assigned to the recirculation gas outlet (15) as well as extension of the life; and the first opening stage of the recirculated gas outlet (15) is started at least before a start of scavenging of the combustion chamber (4) while the last opening stage is executed during a stroke of the piston toward the first end part and basically after completion of introduction of the scavenging gas into the combustion chamber (4).

Description

technical field [0001] The invention relates to a method for operating a large crosshead reciprocating piston internal combustion engine comprising at least one cylinder surrounding a combustion chamber also delimited by a corresponding piston, said engine having a function via a crosshead said pistons associated with a rotatable output crankshaft, and in the combustion chambers, during the working cycle of the engine, combustion is effected in particular by fuel supplied directly into said combustion chambers, and subsequently by the first Scavenging is performed by introducing pressurized scavenging gas towards the first end of the cylinder, wherein combustion products resulting from combustion in the combustion chamber are at least partially recirculated to reduce subsequent emissions from the engine to the atmosphere exhaust gas NO x wherein at the first end of the cylinder exhaust gas passes from the combustion chamber by opening the exhaust gas outlet and recirculation ...

AI Technical Summary

Problems solved by technology

Therefore, the recirculated gas contains only a small amount of combustion products, reducing NO x has very little effect

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