In the Volvo generator cylinder, the clean air filtered by the air filter is fully mixed with the high-pressure atomized diesel sprayed from the fuel injector. Under the upward squeeze of the piston, the volume is reduced and the temperature rises, reaching the level of diesel. Ignite. The diesel is ignited, the mixed gas burns violently, and its volume expands rapidly, pushing the piston down, which is called work. Each cylinder performs work in a certain order, and the thrust acting on the piston becomes the force that pushes the crankshaft to rotate through the connecting rod, thereby driving the crankshaft to rotate. Then the fuel injector of the Volvo generator must have a good atomization function to ensure that the fuel of the Volvo generator is completely burned, the color of the Volvo generator is normal, and the power of the Volvo generator is normal. What are the causes of poor fuel atomization? Try to avoid the failure of poor fuel spray and atomization during use.
The process of dispersing fuel into fine particles is called fuel spray (or atomization). Spraying and atomizing the fuel can greatly increase the surface area of the fuel to evaporate and increase the chance of contact between the fuel and oxygen to achieve the purpose of rapid mixing. There are many factors that affect the characteristics of the fuel beam, mainly including the structure and size of the fuel injector, the fuel injection pressure, the back pressure of the compressed air in the cylinder, the shape and speed of the fuel injection pump cam, and the viscosity of the fuel.
Injector structure and size: The structure of the injector is different, and the internal disturbance caused by the formation of the oil beam is also different, thus producing different forms of oil beam. The fuel beam must be closely coordinated with the combustion system, and different combustion methods require different forms of fuel beam, so fuel injectors of different structures are used.
When the fuel injection pressure and the compressed air back pressure of the cylinder remain unchanged and the total cross-sectional area of the nozzle holes is unchanged, increasing the number of nozzle holes will reduce the diameter of each nozzle hole, and the fuel will be more affected when the fuel flows out of the nozzle hole. Throttling increases the disturbance in the nozzle hole, so the atomization quality is improved. If the diameter of the nozzle hole is enlarged, the core of the oil jet will be dense and the range will increase.
Fuel injection pressure: The greater the fuel injection pressure, the greater the initial velocity of fuel outflow, the greater the degree of fuel disturbance in the nozzle hole and the greater the resistance of the compressed air after it flows out of the nozzle hole, which results in the fineness of atomization And the uniformity is improved, that is, the atomization quality is good. When the injection pressure increases, it also increases the range of the fuel beam.
Back pressure of the compressed air in the cylinder: When the back pressure of the compressed air in the cylinder increases, the density of the compressed air increases, causing the air resistance acting on the fuel beam to increase, so the fuel atomization is improved, the spray cone angle increases, and Reduce the range. In a non-supercharged Volvo generator, the back pressure of the compressed air in the cylinder does not change much, so the effect on the characteristics of the fuel jet is not significant.
The shape and speed of the cam of the fuel injection pump: When the shape of the cam is steep or the speed of the camshaft is high, the fuel supply speed of the plunger of the fuel injection pump is accelerated. Due to the throttling of the nozzle hole of the fuel injector, the fuel cannot flow out quickly. As a result, the fuel pressure in the fuel pipe increases, and the speed of the fuel flowing out of the nozzle hole also increases. Therefore, the atomization becomes better, and the fuel beam range and spray cone angle are both Has increased.
If the combustion of Volvo generators is not sufficient, it will easily cause air pollution. In severe cases, it will also endanger the personal safety of operators. Some methods can be used to improve fuel oil to reduce pollution.
Water injection in the intake pipe: The main function of water injection in the intake pipe is to absorb heat and dilute the fuel density. When a small amount of water enters the combustion chamber and atomizes well, the oil droplets are broken into smaller oil droplets due to the "micro-explosion" effect of water vapor, which promotes the formation and combustion of the mixture. The heat effect can lower the maximum combustion temperature. For example, the mixed injection of water and oil can reduce the fuel density and further reduce the maximum combustion temperature, so NOx emissions are reduced. It should be noted that the water storage tank of Volvo generators needs to be anti-freeze in winter and requires automatic adjustment of water spray volume according to the size of the load.
Emulsified diesel: water is added to diesel, that is, emulsified diesel. Due to its "micro explosion" effect, it atomizes the fuel well, and promotes the formation of strong turbulence in the air in the combustion chamber, and the distribution of fuel and air is more uniform, resulting in carbon Smoke is reduced, and the water-gas reaction of water vapor also reduces soot emissions. In addition, emulsified diesel can lower the maximum combustion temperature, so the amount of nox produced is reduced.
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