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Reasons and Improvement Methods of Insufficient Fuel Combustion of Diesel Generator Sets

May 17, 2022
The insufficient combustion of fuel in diesel generator sets is caused by many reasons. Insufficient oxygen in the cylinder will cause insufficient combustion of diesel fuel. Insufficient oxygen means insufficient air. The cause is mainly in the gas circulation system. A few reasons:
1. The parts of the distributor 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. The muffler is corroded, coke or oil.
3. The gap between the intake and exhaust valves is too large, which reduces the valve opening.
4. The dust accumulation of the air filter element is too much and the air intake is reduced.
5. The problem of diesel atomization will also cause the diesel to not be fully burned.
If the fuel combustion of diesel generator sets is insufficient, it will easily cause air pollution, and in severe cases, it will endanger the personal safety of operators. Users can improve the fuel by the following methods to reduce pollution.
1. Intake pipe water spray
The main function of the water spray in the intake pipe is to absorb heat and dilute the fuel density. When a small amount of water enters the combustion chamber and is well atomized, the oil droplets are broken into smaller oil droplets due to the "micro-explosion" effect of water vapor, thus promoting the formation and combustion of the mixture. The thermal effect can reduce the maximum combustion temperature. For example, the 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 the diesel generator set needs to be antifreeze in winter, and it is required to automatically adjust the water injection amount according to the load.
2. Emulsified diesel oil
Mixing water in diesel oil, that is, emulsified diesel oil, due to its "explosion" effect, makes the fuel atomized well, and promotes the formation of strong turbulence in the air in the combustion chamber, the distribution of fuel and air is more uniform, and the generated soot is reduced. The water-gas reaction of water vapor also reduces soot emissions. In addition, emulsified diesel can reduce the maximum combustion temperature, so the amount of NOx production is reduced.
By adjusting the fuel to promote the combustion of the fuel, after the fuel is fully burned, the harmful gases emitted by the diesel generator set will naturally decrease, which is quite effective in reducing environmental pollution and ensuring the safety of the working environment.