Efi purification technology of diesel engine fuel
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Diesel engine using efi technology, obtained the energy saving, high efficiency, environmental protection and a positive, convenient maintenance and frequent failures, but many users complain about electronic fuel injection engine in a high cost. Common faults of efi engine start is difficult, power down, or for the oil pump, injector change once a frequently spend tens of thousands of yuan. Investigate its reason, the popular theory is that "car oil don't match", poor quality of domestic diesel engine. The author thinks that the key lies in diesel oil refining factory, the pollution problem didn't handle in place.
The world organization for fuel (WWFC) confirmed that half the world's fuel in the process of retail, not reached the pollution levels of ISO18/16/13. In the face of complex efi fuel system, clean diesel requires a higher quality than ever before, especially in demanding higher pollution levels and moisture content.
Diesel pollution key indicators
Solid particle pollution levels
Compliance of diesel in the factory, according to the national standard "ordinary diesel" (GB252-2011) or "automotive diesel (IV)" (GB19147-2013), mechanical impurity for "no". Determination of visual observation, can be used when the sample into the glass cylinder of 100 mg, qualitative observation at room temperature, should be transparent, without suspended impurities and settlement. Need to quantitative measurement, according to GB/T511 detection.
Diesel oil in the process of storage, transportation, storage, if mixed with dust, sand, metal rust mechanical impurities, such as slag will be polluted. Mechanical impurity in the fuel under high pressure, will cause severe abrasive wear for oil pump and fuel injector blockages and stuck. In addition, improper storage of diesel or storage time is too long, the hydrocarbon oil after the evaporation of the hot air flow, the oxidation and polymerization and condensation with cooperation, or react with water and metal, will generate dark, sticky colloid. The residual gum is very bad, easy to jam diesel filter, clog injector after thermal decomposition.
In order to control the diesel solid particles (mechanical impurities of inorganic and organic residue colloid) pollution, can adopt automatic particle counter monitoring, ensure filling to the fuel tank of diesel meet GB18/16/13 pollution levels.
Pollution levels shown in figure 1, it is according to GB/T14039 determine. It is a set of statistic data. The first code "18" said per milliliter
Diesel in the size of 4 microns or total number of particles is not more than 1900; The second code "16" said per milliliter diesel size of 6 microns or more to the total number of particles in not more than 700; The third code "13" table per milliliter diesel 14 microns in size or greater total number of particles is not more than 60.
Four channel measurement with laser automatic particle counter, the sensitivity of 1 mu m, as well as sampling inspection can be on-line monitoring.
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