Darma managers know the importance of cylinder oil management. As the number of new shipbuilding rises and the cylinder lubrication technology continues to improve, the turbine managers are required to continuously improve their awareness and update concepts. Otherwise, there will be blind spots in management. The real consequences of an excessive amount of oil injection (rate) of cylinder oil injection are introduced below. Fault Phenomenon During the operating of the host, there was no abnormally increased smoke temperature. The chimney did not have obvious black smoke, the host's fuel system, lubricating system, supercharger, and smoke exhaust system. Essence Every time the Pistons come out, there are at least two ring carbon ties seriously, stuck in the ring groove, and sometimes the phenomenon of disconnecting the ring; the inner diameter of the cylinder tortoise is measured without wear exceeding the standard; the various assembly gaps of the new ring meet the standards of the standard standards. ; And replaced the new piston head. In order to find the reason, the dock has changed three new cylinder sets, but the situation is still the same. It is said that this phenomenon lasted for nearly three years. At the top of the first ring groove of the piston head, corresponding to the position of 6 cylinder oil injection oil holes, there are cylinder oil flowing and being burned into wide and thick charcoal. The sweeping box was checked, and there were many oil accumulation and more carbon accumulation. These phenomena illustrate the following 4 issues:
1) Cylinder oil supply is too large There are more carbon accumulation, either burning bad or too much cylinder oil. There is no abnormally elevated smoke temperature, and the chimney does not have obvious black smoke, which can exclude the factors of poor combustion. The host is equipped with a traditional PEWT closed -type self -fuel injection oil (this type of oil injection is close to retirement). The overall oil supply regulation is adjusted 5 gears: the first gear is the Base Oil, and the fifth gear is the maximum oil. quantity. Single -cylinder oil supply is adjusted by the screws at the top of each oil pump. The screw rotates 1 grid for a week, a total of 12 blocks, and 6 places such as A, B, C, D, E, and F every week. Oil regulation. The maximum fuel supply operating at the beginning of the factory is decreasing according to the running hours until the running is running in the normal fuel supply position. The actual situation is that the single -cylinder adjustment screws that have been exported for more than ten years are also set at 10A. The oil supply of cylinder oil is twice the basic fuel supply, which is three times that of the fuel supply recommended during motor voyage. Due to the captain's low -speed voyage, the host operates at low load, coupled with a large surge, and the load changes often cause the oil injection device to jump to the high oil supply rate. As a result, the oil supply is excessive, and the residual oil is gathered in the sweeper. Obviously, it is the main reason why the motorcycle commander failed to adjust the fuel supply rate in time and accurately.
2) The disabled oil of the sweeping box is not smooth For the excessive amount of cylinder oil, some of the piston rings are scraped off from the wall of the cylinder to form oil accumulation in the sweeping box. The other part is attached to the cylinder oil at the cylinder wall and the cylinder oil in the cylinder and grooves. When the host operates, the pressure of the triability is basically the same as that of the sweeping box. When the residual tube system is unblocked, the residual oil of each cylinder can smoothly enter the sweeping box to put the residual cabinet. There is no accumulation of oil and carbon in the lower space of the piston. When it is not smooth, the residual oil cannot flow out in time, and it becomes more and more blocked, resulting in a large amount of slag and oil accumulation in the lower part of the piston. The traditional sweeping box disability method is to be implemented by the duty personnel regularly by opening the residual valve one by one to reduce the loss of sweeping pressure as much as possible to avoid affecting the quality of combustion. Regularly put the residue on a regular basis, because the amount of residual oil cannot be observed directly, and it is difficult to judge how long it takes to let it go. Often, it depends on experience. The impact of human factors has a great impact. For modern ships, the use of high -pressure diesel engines can ignore the effects of a small amount of sweeping losses on combustion. The residual valves of each sweeping box are often opened. The ship in charge of the ship failed to understand this new concept. In the management, the traditional manual disability method was still adopted. For a long time, this disabled method was transferred one by one. Putting the disabled manually, the time is too short, and the discharge is incomplete. The carbon residue in the residual oil gradually sedimentary obstruct the tube. As a result, each time the sweeping box was checked, all the residual oils in the sweeping box continued to the upper edge of the filler letter in the lower part of the cylinder, and the oil leakage hole was seriously blocked.
3) Sweeping box high -temperature alarm Excessive cylinder oil enters the cylinder and is burned or scorched on the piston ring or the cylinder wall. The situation of the seal in the cylinder deteriorates. The author believes that the reason for the broken ring is due to the large clearance of the heavens and the earth, and the high temperature gas entering the back of the ring causes heat fatigue and the piston ring sticks to the inside of the ring groove to death, thereby breaking the fatigue. When the piston downside to the third ring rings just passed the air -sweeping mouth, the gas pressure in the cylinder is still higher than the sweeping pressure, and the gas of the first and second -road pistons will be able to run a sweeping box due to losing the sealing effect of the piston. The temperature rises rapidly than the alarm value of 80 ° C, which in turn triggers the host to reduce the speed. Although there is no actual fire, the large -scale deceleration of the large -scale hosting is obvious.
4) Cylindrical and piston rings are super often worn Excessive cylinder oil attached to the wall of the cylinder is burned or burnt to form abrasives. The carbon residue in the sweeping box is a solid formed in the combustion. It contains various metal, non -metal impurities, catalysts and other particles, which are of great hardness. Coupled with the inferior fuels of particles such as silicon, aluminum and catalysts, these particles burned in the cylinder to make them sintering large, and they also entered the person's cylinder set and piston ring to generate abrasive wear. These particles entered the sweeping box with high pressure gas, increased carbon accumulation and oil accumulation of the sweeping box, and then fluttered by the airflow pressed by the downlink piston. Between the cylinder set and the piston ring, the malignant cycle, increase the abrasive, and exacerbate wear. Dorph management is a process of self -reflection. To sum up the lessons of this ship, cylinder oil can reduce the wear and corrosion of the cylinder and piston ring, but the more the better. For high -sulfur fuel, cylinder oil with high total alkali value is required instead of increasing the supply of cylinder oil. In the face of the mandatory implementation of the global sulfur limit order (sulfur content below 0.5%) on January 1, 2020, low -alkali -value cylinder oil BN40 or lower base value is about to be put into use. Relatively speaking The role of the effect is greatly reduced, so how should the oil injection rate of the host cylinder be adjusted? We need to continue to explore and summarize in our work.
