Method for operating large diesel engine and large diesel engine

Abstract

The invention provides a method for operating a large diesel engine and the large diesel engine. The invention relates to the method for operating the large diesel engine, which is designed as a dual-fuel large diesel engine, which can be operated in a liquid mode in which liquid fuel is introduced into a cylinder for combustion, and which can also operate in a gas mode in which gas is introduced as fuel into the cylinder. In the method there is a change from the liquid mode to a mixed mode in which the gas content of the gas is supplied as fuel, the liquid fuel is supplied to the cylinder and the liquid content of the liquid fuel is supplied to the cylinder, a control parameter is determined as a characteristic of the combustion quality in the cylinder in the mixing mode, a limit value is predetermined for the control parameter, and the gas content is continuously increased until the control parameter reaches the limit value.

Description

technical field [0001] The invention relates to a method for operating a large diesel engine designed as a dual-fuel large diesel engine and to a large diesel engine. Background technique [0002] Large diesel engines traditionally run on heavy fuel oil. Large diesel engines, which may be designed as two-stroke or four-stroke engines, e.g. as longitudinally-scavenged two-stroke large diesel engines, are often used as drive units for ships or even in stationary operation, e.g. for driving large power generators machine to generate electricity. Engines are usually run in continuous operation for considerable periods of time, which places high demands on operational safety and availability. Particularly long maintenance intervals, low wear and economical handling of operating materials are therefore central criteria for the operator. Large diesel engines typically have cylinders with an internal diameter (bore) of at least 200mm. Now, use larger engines with bores up to 960...

AI Technical Summary

Problems solved by technology

A mixture that is too rich can cause all sorts of problems where combustion happens too quickly (rapid combustion), or the engine starts knocking, or the mixture in the cylinder then dies prematurely by self-ignition usually due to too much gas content (with working cycle dependent) start combustion (pre-ignition)

In operating states beyond the misfire limit, the air-gas mixture is too lean, i.e. there is not enough gas in the combustion chamber for optimal combustion

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