Sediments from choke and kill manifolds

Sediments from choke and kill manifolds
The sediment sources of the choke manifold are complex, but can be summarized into the following categories:
1. Mechanical impurities or scales such as gum, asphalt, and carbon residue deposited by oxidation in the engine oil will accumulate in the throttle clearance.
2. Due to the aging or squeezing of the oil, charged molecules are generated, and there is a potential difference on the metal surface of the throttling gap. Therefore, molecules are adsorbed onto the surface of the gap, forming a solid boundary coating with a thickness of generally 5-8 microns, which affects the size of the throttling gap. When the accumulated and adsorbed substances reach a certain thickness, they will be washed away by the liquid flow and then reattached to the valve port. This continues, creating a pulsating flow.
When the pressure difference at the valve port is large, due to the high temperature at the valve port, the degree of liquid squeezing increases, and the metal surface is more prone to friction to form a potential difference. When the pressure difference is large, it is easy to cause blockage.
4. Exhaust gas source: The combustible gas mixture in the combustion chamber enters the crankcase through the piston gap and mixes with engine oil vapor to form a mixed gas. In order to avoid dilution and contamination of engine oil, the crankcase will have a forced mixed gas ventilation system (PCV) sucked into the intake port to participate in secondary combustion. After entering the inlet, this part of the exhaust gas will condense and form a liquid phase due to the decrease in temperature, and the "unstable components" in it will oxidize and condense at high temperatures, forming oil scale and adhering to the surface of the choke and kill manifold.
5. Deep lubricating oil for turbocharged compressors: For turbocharged engines, exhaust gas drive is currently commonly used, which uses high-pressure exhaust gas generated by the exhaust channel to drive the turbine. The compressor blades in the intake duct are driven by a coaxial shaft to increase the pressure of the air flow in the intake duct. However, under long-term harsh working conditions, coaxial bearings are prone to the infiltration and volatilization of lubricating oil, resulting in a doubling of inflation efficiency and the formation of heavy oil pollution that enhances the sediment adhesion of the choke and kill manifold body.
6. Fuel vapor discharged from the carbon canister by the wellhead equipment manufacturer: Cyclopentadiene, which is prone to form sediment in the choke and kill manifold in the fuel vapor adsorbed by the engine carbon canister, can be oxidized and condensed to form colloidal oil scale under continuous high temperatures.