What are the specific causes of black smoke from diesel generator sets?

1. Insufficient fresh air in the cylinder.

Causes: (1) Excessive dust accumulation in the air filter element; (2) Muffler rust, charcoal or oil stains. (3) The gap between the intake and exhaust valves is too large, which reduces the valve opening; (4) The parts of the fitting mechanism are loose, worn and deformed, the relative position of the camshaft gear and the crankshaft timing gear changes, and the valve opening and closing time is incorrect.

2. Reasons for the drop in temperature and pressure at the end of cylinder compression:

1) The cylinder barrel and piston ring are worn too much, and the piston ring is installed incorrectly or loses its elasticity, resulting in cylinder leakage; (2) The valve clearance is too small, and it is easy to be opened when the car is hot, or the cylinder is not tightly sealed due to valve ablation and carbon deposit; (3) Air leakage between the cylinder head and the body, the joint surface of the fuel injector and the cylinder head; (4) The valve is seriously sagging, and the gap between the piston and the piston pin, the piston pin and the connecting rod small head, and the connecting rod big head and the connecting rod journal are too large, which increases the volume of the combustion chamber and decreases the compression ratio.

3. Poor diesel atomization.

Causes: (1) The injector pressure adjustment is too low; (2) The injector pressure regulating spring is broken or the card is issued; (3) The injector needle valve and valve seat are decarbonized, and the needle valve is stuck or worn too much; (4) The pressure reducing ring of the oil outlet valve of the fuel injection pump is worn too much, which makes the fuel injector drip oil.

Fourth, the oil supply time and oil supply amount are incorrect.

The reasons are: (1) the oil supply time is too late; (2) At the beginning of starting, the gas pressure and temperature are low, and the oil supply time is too early; (3) Increase the oil supply stroke after the plunger parts of the fuel injection pump are worn; (4) The stroke of the adjustment tooth rod or tie rod of the fuel injection pump is too large, resulting in too much oil supply.

The failure of black smoke from the exhaust pipe after the diesel generator set is started is generally caused by incomplete combustion of diesel fuel after being injected into the combustion chamber, resulting in a large amount of free carbon and exhaust gas being discharged together. The specific reasons for the black smoke of diesel generator sets are as follows:

d. The fuel supply advance angle of the fuel injection pump is too small.

When the fuel supply advance angle of the diesel generator set is too small, it will cause the fuel injection delay of the injector, so that the diesel fuel in the injector combustion chamber will be discharged before it has time to fully combust, that is, the diesel generator set will be seriously combusted and the exhaust will emit black smoke. When the oil supply advance angle is too small, it will also lead to the exhaust temperature increase, the fuel consumption will increase, the power is insufficient and other fault phenomena.

2) The amount of each cylinder of the fuel injection pump is uneven.

When the diesel generator set is working under the rated load, if the oil supply of each cylinder of the fuel injection pump is uneven, it will make the diesel generator set emit black smoke. Because the load borne by each cylinder is certain, if the oil supply of individual cylinders is reduced, the other cylinders will be overloaded, so that the diesel fuel in the combustion chamber will increase, so that the diesel fuel can not be fully combusted, and the fault phenomenon of black smoke appears.

3) Injector failure.

When the injector has oil dripping, oil channeling or poor atomization, it will cause the diesel combustion time in the spray combustion chamber to be delayed and the exhaust gas will emit black smoke.

4) Poor sealing of the combustion chamber.

When the internal sealing of the combustion chamber is poor, it will lead to the reduction of the amount of compressed air inside the cylinder, and the temperature and pressure at the end of compression will decrease, and the diesel fuel inside the combustion chamber can not be completely burned due to the lack of sufficient air, which makes the exhaust pipe emit black smoke. There are many factors that cause poor sealing of the combustion chamber, such as excessive wear of pistons, piston rings and cylinder liners, piston rings installed in the right place, cylinder gasket leakage, and poor valve closing.

5) The air intake of the diesel generator set is insufficient.

The air intake inside the combustion chamber is certain, if the air filter is not maintained properly, the carbon deposit inside the combustion chamber increases, the exhaust pipe is blocked or the turbocharger is damaged, etc., the air intake inside the combustion chamber will be reduced, which will affect the full combustion of diesel, resulting in a large amount of free carbon and exhaust gas discharged from the exhaust pipe together.

6) The diesel generator set is overloaded.

In the process of operation, if the diesel generator set is overloaded, it will lead to an increase in the diesel fuel in the combustion chamber, and the excess diesel fuel will not be fully burned and the exhaust pipe will emit black smoke under the condition that the air volume in the combustion chamber remains unchanged.

If the throttle is turned off, you can check whether the intake air is insufficient, resulting in insufficient combustion. If it can't be solved, it may be a fuel injection moment encounter, resulting in a lack of power and a cannon sound. By the way, if everything is normal with the diesel engine when you are no-loaded, then it is likely that there is a problem with the generator winding and excessive resistance, not necessarily the diesel engine!

1) Black smoke: black smoke when the diesel engine is running is a sign of incomplete diesel combustion: if the diesel engine emits black smoke for a long time, it not only pollutes the atmospheric environment, but also increases fuel consumption and increases the operating cost.

2) Blue smoke: When too much oil enters the combustion chamber, the oil participates in the combustion, and the exhaust is blue in the sun. The piston ring bites in the ring groove to reduce the power of the diesel engine, and in serious cases, major mechanical accidents will occur that bite the cylinder and liner cracks, so the cause of the diesel engine should be found to be excluded.

1) The governor fails.

2) High pressure oil pump failure.

3) The accelerator pedal is not flexible.

4) The air filter is blocked, and the air intake is insufficient (if the governor is normal, the fuel supply will be automatically increased, resulting in a large part of the fuel can not be completely burned), resulting in black smoke.

1. The main reason for the black smoke of the diesel engine is due to the incomplete fuel conversion rate, in addition to the structural design of the equipment itself, it may also be caused by some details that the operator has not noticed, and the specific reasons are as follows:

1) The fuel tank of the diesel engine is not sealed, and the long-term contact with the air causes some suspended impurities and dust in the air to fall into the air filter, causing the air inlet to be blocked, resulting in insufficient air for internal combustion, resulting in incomplete combustion.

2) The fuel quality is not good, resulting in the blockage of the oil pipe passage inside the fuel tank, resulting in insufficient oil supply. Poor fuel quality can also cause damage to the fuel filter, deterioration of the oil inside causing black smoke, and in severe cases, damage to the fuel system.

3) The oil pipe of the fuel system causes some impurities to adhere to the surface of the pipeline due to poor oil quality, 2. The solution of black smoke from the diesel engine.

1) It is recommended that you should clean frequently in a harsh environment, and in an environment with good air, you can clean it every once in a while, and replace the air filter regularly.

2) Check the fuel system, replace the solenoid valve and fuel filter in time;

3) Regular cleaning of the oil pipe, adding diesel additives twice can effectively improve the situation of black smoke.

Seven causes of black smoke.

When the vehicle leaves the factory, the smoke degree has been tested to meet the relevant standards, and it will not emit black smoke under normal use conditions, and the diesel engine will emit black smoke only when it is overloaded. If the diesel engine emits black smoke when it is running at no load or light load, or if it emits too much black smoke when it is under heavy load, it is not working properly.

1. Poor work of the injector: poor atomization or dripping of oil injector of large pump truck, especially obvious at low speed of diesel engine, the lower the speed, the greater the smoke, you can use the single-cylinder oil cut-off method to find cylinder by cylinder, when temporarily stop supplying oil to a cylinder, the phenomenon of black smoke is reduced or disappears, and under the normal operation of the fuel injection pump, it can be judged that the cylinder injector is faulty. The injector parts should be cleaned, ground or replaced separately according to the situation.

It is not only large pump trucks that emit black smoke, but after the emission upgrade, the vehicle has more EGR systems, such as uneven fuel supply, premature injection time, and insufficient atomization. If the EGR valve fails and is not closed tightly, exhaust gases will enter the engine while the vehicle is driving or idling. When the exhaust gas is mixed in, the air content on the intake side of the cylinder decreases, resulting in a decrease in oxygen, and the carbon content in the exhaust gas is increased due to insufficient fuel combustion, and the exhaust gas turns black.

2. Improper adjustment of the advance angle of oil supply: the advance angle of oil supply is too small, the aftercombustion increases, and the fuel cannot be completely burned, forming carbon smoke and discharge, resulting in black smoke from the exhaust. At this time, the oil supply advance angle should be adjusted to the appropriate position.

3. The fuel supply of the fuel injection pump is too large: the oil supply is too large, the black smoke is continuous, and the larger the throttle, the greater the black smoke, which can be checked by the oil cutting method, when a cylinder is stopped, if the smoke disappears, under the normal working condition of the injector, it can be concluded that the oil supply of the cylinder is too large, and the oil supply of the cylinder should be appropriately reduced, and the fuel injection pump should be removed if necessary, and the test bench should be debugged. The reason for the excessive oil supply is that there is an error in the correction of the fuel injection pump, resulting in excessive oil volume; The oil volume adjustment screw of the oil pump is loose, so that the oil volume increases; The timing screws on the tappet of the fuel injection pump are loose, and the interval angle changes; The smoke limiter comes off and emits a lot of black smoke when it starts.

4. Air filter blockage: After the air filter element is blocked, the air intake of the diesel engine is reduced, and the same amount of diesel fuel is injected into the cylinder, and there is not enough air to mix with it, and the diesel fuel cannot be fully combusted, resulting in black smoke. The air cleaner cartridge should be replaced.

5. Excessive load of diesel engine: when the vehicle is accelerating, climbing or overloaded with diesel engine, the diesel fuel injected into the combustion chamber increases, but too much diesel and air are mixed unevenly, and it is still inevitable that there will be insufficient local air combustion, and the diesel will decompose and polymerize into carbon smoke under the condition of high temperature and high pressure and lack of oxygen, and black smoke will be discharged with the exhaust gas. Overloading the vehicle during operation should be avoided as much as possible.

6. Poor diesel quality: the diesel engine uses inferior diesel, or the diesel contains other impurities in the fuel, so that the combustion is not sufficient and the black smoke is discharged.

7. Other reasons: insufficient compression ratio, too large or too small valve clearance, valve stickiness or poor sealing of valves and valve seats, wear and tear of piston rings and cylinder liners, etc., are all important reasons for the black smoke of diesel engines.

The exhaust gas discharged from the exhaust pipe of the diesel engine contains engine oil and is sprayed at the same time, which is caused by the excessive gap between the piston ring and the oil ring, and the engine is difficult to start.

Because the lubrication between the piston ring and the cylinder barrel relies on the high-speed rotation of the crank, the oil splashes between the cylinder barrel and the piston for lubrication, commonly known as splash lubrication. Excess oil splashes onto the cylinder wall and scrapes down the oil pan by the oil ring.

However, due to the large gap between the piston ring and the oil ring, the lubricating oil that splashes into the cylinder barrel wall is strung into the cylinder and combusted, due to incomplete combustion, when the exhaust gas is discharged from the exhaust cylinder, there is a blue smoke phenomenon, and at the same time, the lubricating oil that is not burned and the color is black is sprayed out with the exhaust gas, and the black oil stain flows out of the exhaust port.

Exclusion method: replace the piston ring and the oil ring to ensure the standard clearance between the piston ring and the oil ring.

The reasons why diesel engines emit black smoke are as follows:

1. The quality of diesel is poor, and the performance indicators of diesel used do not meet the standard requirements, resulting in poor fuel combustion and black smoke. Secondly, the quality of diesel is not good, which will damage the diesel filter, resulting in the deterioration of the diesel inside the diesel engine, resulting in the phenomenon of black smoke; 2. The air inlet is blocked, the fuel tank of the diesel engine is not sealed, and due to long-term contact with the air, it is inevitable that impurities and dust in the air will fall into the air filter. These particles will cause the air intake to be blocked, and it will not provide sufficient air when the diesel is burned, which can easily cause incomplete combustion, which will lead to black smoke from the diesel engine; 3. The compression force is insufficient, and one of the conditions for diesel combustion is that a combustion environment with a certain pressure is required.

However, if the valves, piston rings, etc. are worn, the compression pressure will be insufficient, resulting in the required pressure not meeting the requirements of combustion, so that the combustion conditions will deteriorate, and the diesel engine will emit black smoke; 4. The change of the combustion environment, the long-term use of the diesel engine and some other factors will lead to the change of the shape and volume of the combustion chamber, which will further lead to the decline of the quality of the fuel and air mixture, and the poor combustion conditions will produce black smoke; 5. The oil supply is too large, if the diesel fuel poured into the diesel engine is far greater than the amount of oil required when the diesel engine is working, this behavior will make the mixture thicker, which is easy to cause incomplete diesel combustion, resulting in black smoke.

Hello! There must be black smoke and incomplete combustion, maybe the air filter is blocked, of course the black smoke is not good, and there are impurities in diesel.