How to Remove Diesel Generator Carbon Deposit?

by Starlight Generator dieselgeneratortech

During the maintenance process of diesel generator set, the problem of removing carbon deposits is often encountered. Most of the carbon deposits in the engine are accumulated on the valve, piston and cylinder head. The composition of the carbon deposits has a great relationship with the structure of the engine, the location of parts, fuel, lubricating oil types, working conditions, and working hours.

Carbon deposit is a complex mixture of colloid, asphaltene, carboid, lubricating oil, and carbon, which is formed by the incomplete combustion of fuel and lubricants of diesel generator under high temperature. These carbon deposits affect the heat dissipation effect of some parts of the engine, worsen the heat transfer conditions, affect its combustion, and even cause the parts to overheat and form a crack.

At present, mechanical cleaning, chemical and electrolytic methods are often used to remove carbon deposits from the generator set.

Mechanical cleaning

It uses a wire brush and scraper to remove the carbon deposits. In order to improve production efficiency, when a wire brush is used, the electric drill can be driven to rotate by the flexible shaft. This method is simple and often used for small-scale maintenance units, but has low efficiency, easily damages the surface of parts, and is difficult to remove carbon deposits.

It can also be used to remove carbon deposits by spraying nuclear debris. Because the nuclear debris is softer than metal, it will deform itself when it impacts the part, so the surface of the part will not be scratched, and the production efficiency is also high. This method uses compressed air to blow dry and crushed peach, apricot pit and walnut hard shell to impact the surface of the parts with carbon deposits, destroying the carbon deposit layer and achieving the purpose of removal.

Chemical method

For the surface of some finished parts, the mechanical method cannot be used, but chemical method can be used. Immerse the parts in a cleaning solution such as sodium hydroxide and sodium carbonate at a temperature of 80-95°C to dissolve or emulsify the grease and soften the carbon deposits. Take out after about 2 to 3 hours, and then remove the carbon deposits with a brush. Add 0.1% ~ 0.3% potassium dichromate in hot water for cleaning, and then blow dry with compressed air.

Electrochemical method

The alkali solution is used as the electrolyte, and the workpiece is connected to the cathode, so that the carbon deposit is removed under the combined action of chemical reaction and hydrogen stripping. This method has high efficiency, but it is necessary to master the specification for removing carbon deposits. For example, the specification for removing carbon deposits by valve electrochemical method is roughly: voltage 6V, current density 6 A / dm2, electrolyte temperature 135 ~ 145°C, and electrolysis time is preferably 5-10 min.