Reciprocating internal combustion engine, exhaust gas conditioning and method for operating a reciprocating internal combustion engine

Abstract

The invention relates to a reciprocating internal combustion engine (1), in particular a two-stroke engine or four-stroke engine, in particular a longitudinally scavenged two-stroke large diesel engine, comprising a cylinder (2) with an outlet valve (3) and a combustion chamber (4) unilaterally limiting piston (5), in the cylinder (2) between an upper dead center (OT) and a bottom dead center (UT) is arranged back and forth. In this case, an exhaust gas line (6) is provided such that an exhaust gas (7) from the combustion chamber (4) via the outlet valve (3) of the exhaust line (6) can be fed .; According to the invention, an exhaust gas treatment (8910) is comprising an exhaust gas catalytic converter (8) and a bypass line (9) and a switching device (10) provided such that the exhaust gas (7) by means of the switching device (10) alternatively through the exhaust gas catalytic converter (8) or on the bypass line (9) from the combustion chamber (4) of the exhaust line (6) can be fed. The invention further relates to an exhaust gas treatment (8910) with exhaust gas catalytic converter (8), bypass line (9) and switching means (10), and a method for operating a reciprocating internal combustion engine.

Description

technical field [0001] The present invention relates to a reciprocating piston internal combustion engine, in particular to a uniflow-scavenged large two-stroke diesel engine with exhaust gas conditioning according to the preambles of the independent claims of the corresponding category, exhaust gas Regulating device and method of operating a reciprocating piston internal combustion engine. Background technique [0002] In practice, there has long been a need for so-called "dual-fuel" engines, ie engines that can run on two different fuels. For this, on the one hand, fuel gas should often be burned, for example in the form of natural gas, such as the so-called "liquefied natural gas" (LNG), or in the form of liquefied petroleum gas and another gas suitable for driving an internal combustion engine; Alternatively, another fuel such as petrol, diesel, heavy fuel oil or another suitable liquid fuel may be combusted in the same engine. In this regard, the engines may be both t...

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Problems solved by technology

[0006] However, such oxidation catalysts are often sensitive and can be severely damaged by exhaust gases different from those provided for them

For example, if the oxidation catalyst of a pure gas engine according to WO2010147071A1 is acted on by the exhaust gases of burned diesel or even by the exhaust gases obtained by burning heavy fuel oil, it will after a very short time be affected by all the above-mentioned chemical properties of these exhaust gases. components of a very positive nature are irreparably damaged, whereby further safe and reliable operation of the engine will be at least questionable, and at worst even impossible

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