Dual-fuel oil supply system for marine diesel engine

Abstract

The invention aims to provides a dual-fuel oil supply system for a marine diesel engine, which comprises a main engine, an oil supply unit, a high-sulfur oil compartment and a low-sulfur oil compartment, wherein the oil supply unit comprises fuel oil transfer pumps, a fuel oil reflux cylinder, fuel oil circulating pumps, a fuel oil heater and a total sulfur filter; oil inlets in the fuel oil transfer pumps are communicated with oil inlet pipes; the oil inlet pipes are communicated with an outlet pipeline of the high-sulfur oil compartment and that of the lower-sulfur oil compartment via a tee; oil outlets in the fuel oil transfer pumps are communicated with oil outlet pipes; the oil outlet pipes are communicated with the fuel oil reflux cylinder; the fuel oil reflux cylinder is communicated with the main engine and the high-sulfur oil compartment via a first loop and a high-sulfur oil loop respectively, and is communicated with the fuel oil circulating pumps, the fuel oil heater and the total sulfur filter in sequence via a second loop; and an end part of the second loop is connected with the main engine. The dual-fuel oil supply system has the advantages that not only can the emission of a ship reach the emission standard during ECAs running, but also the lubricating levels of a fuel spray nozzle inlet and fuel oil pumps and the viscidity of fuel oil during fuel oil switching can be guaranteed.

Description

technical field [0001] The invention relates to a marine diesel engine, in particular to an oil supply system for a marine diesel engine. Background technique [0002] In accordance with EU Directive 2005 / 33 / EC-Notice on Amending the Control of Fuel Oil Flow Control for Ships Calling at EU Ports, from January 1, 2010, except for those extended areas, all ships calling at EU ports shall not have sulfur content in their fuel oil. Exceeds the maximum limit of 0.10% (by weight). At the same time, the California Air Resources Board (CARB) also stipulated the effective date of the maximum limit on the sulfur content of fuel oil. Since July 1, 2009, all ships calling at California ports in the United States will use sulfur content not exceeding 1.5% fuel oil or 0.5% diesel oil; since January 1, 2012, all ships calling at California ports in the United States will use fuel oil or diesel fuel with a sulfur content of no more than 0.1%; Action Plan for Prevention and Control, which fo...

AI Technical Summary

Problems solved by technology

Although the patent has designed low / high sulfur oil switching, it ignores the difference in viscosity and lubricity of different fuels

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