Analysis of the failure of the exhaust valve of marine diesel engine parts

      Influence of Additional Factors on DK28 Diesel Engine Parts

      Due to rising fuel prices and fierce competition in the shipping market, some shipowners use low-priced, low-quality fuel in order to reduce costs to achieve the goal of improving competitiveness and obtaining more profits. These fuels have high viscosity, long flame retardancy, and relatively high content of vanadium, sodium and sulfur. When this kind of fuel is burned in a diesel engine, only part of the emissions (fuel ash) contained in the residual oil leaves the machine with the exhaust gas, while the remaining part remains on some high-temperature parts in the engine. For example, the exhaust gas and piston crown form deposits, causing so-called "high temperature corrosion". So far, there is no reasonable process to remove corrosive elements from residual oil. Even high-grade alloy steel and surfacing exhaust valve steel are also corroded by fuel oil.

      Violation of vehicle and ship maintenance regulations during diesel engine operation, start the diesel engine at low temperature, force loading at low temperature, and drastically change the combustion temperature of the diesel engine cylinder. Under the load state of the diesel engine, sharply change the handle position, which will deteriorate the combustion state of the diesel engine cylinder and cause a lot of poor atomization. Large heavy oil particles are injected into the cylinder, causing serious afterburning and incomplete combustion. Serious carbon deposits make the surface of the exhaust valve valve line also contaminated by carbon deposits, and even cause difficulty in starting the main engine, which will become the next main engine start The hidden dangers of oil head and exhaust valve failure soon, so these bad habits of operating and maintaining diesel engines are also factors that cause diesel engine valve failures.