In this case, you can first check the low pressure oil line. Inspection revealed that the low pressure oil line was normal. If the oil-water separator was replaced, the situation still did not improve. Later I figured that if there was a problem with the low pressure oil line, an error would definitely be reported. Next, we need to think about how to properly use the inlet pipe of the 200 kilowatt diesel generator set. After disconnecting the air flow meter, the idle speed will not drop, and the starting speed can also be increased (the speed increase is a little). slow);
Check it Check if the air filter is too dirty. Clean the air filter and take a test drive after installation. Black smoke will be emitted when you release the accelerator. After a test drive without an air filter, black smoke will still come out whenrelease the accelerator. There are still issues with other components of the intake system; I checked the compressor and EGR valve and they are all normal. When checking the air intake system, it was found that the pipe from the intercooler to the air intake pipe had completely fallen off. The problem was solved after tightening the collar.
Possible reasons include: the air filter is too dirty, resulting in insufficient air intake, the air intake flow measured by the air flow meter is low, and the ECU limits the amount of oil. After disconnecting the air flow meter, the ECU uses the air flow replacement value for fuel injection, which can increase the speed. Due to the low actual air intake, the speed increase is slow.
Analysis of the causes of black smoke from diesel generators
Since black smoke is the product of a cincomplete combustion of fuel, the main cause of black smoke is fuel. Caused by defects in the combustion assembly and defects in the intake and exhaust systems. The reason why diesel generators emit black smoke is that when the oil that lightly enters the cylinder of the diesel generator is burned, it decomposes at high local temperatures and lack of oxygen, and dehydrogenates into tiny particles solids with carbon as the main component. It is the product of incomplete combustion. It is generally expressed in terms of smoke and its unit is the BSU (Bosch). Therefore, whether it is the fuel system, combustion system, or intake and exhaust system, any factor affecting the entire combustion can cause black smoke.
(1) Fuel injector atomization is poor, oil particle size is uneven ortoo big, and it cannot mix well and evenly with air. Local areas lack oxygen during combustion and crack. at high temperature, thus producing a black cigarette. Tests have shown that when a cylinder has poor atomization, even if the fuel consumption increases by only 0.1%, the smoke level can reach 4BSU.
(2) Abnormal injection of the fuel injector (including secondary injection, alternating injection, multiple injections or drops) will cause fuel injection into the cylinder to continue after that the cylinder is on fire. the fuel burns at high temperature and lack of oxygen, so it is easy to produce black smoke.
(3) The fuel supply to the individual cylinders is too large or the diesel generator is overloaded, because there is too much fuel in the cylinder, lack of air and lack of oxygen in the fuelion, which results. black smoke. In fact, this is also the reason why black smoke is caused by pulling the cylinder and holding the shaft. At this point, the friction work of the diesel generator is greatly increased. Only by increasing the operating capacity of the cylinder can the same large effective work be produced. This also equates to overloading the diesel generator, resulting in emissions. black smoke.
(4) The quality of diesel does not meet the requirements, especially the cetane index is too low, which worsens the ignition performance of the diesel generator and the combustion delay will increase later , causing black smoke. .
(5) Deformation of the inner hole of the high pressure oil pipe will cause changes in the flow capacity and pressure of the oil pipe will cause secondary injection of the injector and affect the quality of L'atomization: The piston of the fuel injection pump is badly worn. The oil outlet valve is badly worn, causing the oil pipe pressure to decrease. deteriorating the atomization quality of the injector. All this results in incomplete combustion of fuel, high local temperatures and lack of oxygen, causing black smoke.
(6) There are some requirements for the height of the injector of Cummins series diesel generators extending out of the cylinder head plane, which is 2.4-3.0mm if the gasket is incorrect during disassembly and assembly. process, it will cause oil. The distance between the cylinder head and the cylinder head plane is too large or too small, which will not ensure that the spray mist torque matches the shape of the combustion chamber well. It will either be sprayed on the combustion. the chamber wall or lower plane of the cylinder head, causing a leaklocal fuel. It cannot be well contacted and mixed with air, causing local high temperature and lack of oxygen producing black smoke.
(7) An important condition for the combustion of diesel generator is that the cylinder must have a certain compression pressure and a certain compression temperature. When the piston ring seal and valve seal are bad, the compression pressure in the cylinder is insufficient, resulting in insufficient combustion and black smoke.
(8) The function of the ventilation system of the diesel generator is to supply fresh air to the diesel engine regularly and quantitatively according to the operating conditions of the diesel generator, and to exhaust the exhaust gas. When the air filter is clogged, the compressor is clogged, the intercooler is clogged, the exhaust muffler is clogged, or the manifold pressure is insufficient due to compressor failure, the amount of air entering the cylinder of the diesel generator is insufficient, resulting in combustion failure. Lack of air, high temperature and lack of oxygen produce black smoke.
(9) Improper gas distribution phase can not only cause insufficient air intake and poor exhaust from the diesel generator, but also change the intake and exhaust patterns, thereby affecting normal ventilation and combustion of the diesel generator. , causing black smoke.