Matters needing attention in the use of heavy fuel oil by ships

In order to ensure the safety of the equipment, the main engine and auxiliary engine shall not use unpurified fuel, so the ship shall ensure a certain number of spare parts for the oil separator. If the fault of the oil separator needs to be repaired as soon as possible, the ship should report to the maintenance supervisor as soon as possible. The viscosity of fuel inlet plays an important role in fuel atomization. In order to ensure good combustion effect, it is necessary to control the viscosity of fuel inlet. The general viscosity range is: host12 ~15 mm/s; Auxiliary engine 1 1 ~ 14 mm/s (each wheel needs to be found in the ship's equipment manual); When the viscometer can't be used normally.

By looking at the viscosity thermometer of marine fuel, find out the fuel inlet temperature range and choose the appropriate inlet temperature; In addition, before the oil supply unit enters the engine, the temperature drop of this pipeline should be considered on board, so the viscosity should be adjusted according to the actual inlet temperature when setting the viscosity.

If the ship uses inferior fuel, it will cause the following hazards to the ship's equipment:

(1) Combustion deterioration

The atomization of inferior fuel is difficult, the naturalness is poor, and the afterburning is serious, which leads to the decrease of the maximum explosion pressure of the engine, the increase of exhaust temperature, the increase of exhaust smoke (black smoke) and the serious carbon deposition in the cylinder. The secondary combustion is serious, which increases the mechanical load and thermal load of oil injection equipment, aggravates the wear and corrosion of sealing parts of oil injection equipment, and intensifies the carbon deposition and liquefaction of spray holes.

(2) Wear

Ash, mechanical impurities in inferior fuel and metal catalysts such as aluminum and silicon used in refining cause abnormal wear of engine cylinder liner, piston, high pressure oil pump and injector.

(3) Corrosion

Low temperature corrosion caused by high sulfur in low-quality fuel and high temperature corrosion caused by high sodium and high vanadium damage cylinder liner, exhaust valve and valve seat, turbocharger and bearing.

The gas containing sulfur oxides leaks into the crankcase, which may lead to the rapid deterioration of lubricating oil and corrosion of related bearings.

(4) poor stability

There is too much sludge in the oil purifier and filter, which makes the oil purifier have too much sludge and blocks the filter; In addition, after a long time in the deep oil tank, a large amount of sludge will be deposited at the bottom of the tank, which is difficult to pump out and cannot be used.