Internal Fuel Injector Deposits

A study of factors influencing the formation of harmful deposits in the diesel engine injectors

“…The studies conducted to date clearly indicate that trace content of some elements, mostly metallic, accelerate the formation of external and internal deposits (IDID) in injectors, and Zn and Cu to a greater degree intensify the formation of external deposits, and Na, Cl, K, Ca and Mg the formation of IDID, as indicated by the results of studies by Iida [8], Lacey et al [9] and Shiotani and Goto [13].…”

“…The formation process of organic coke deposits is a result of thermal decomposition of fuel during combustion, and the size of deposits can be controlled to some degree by adding detergent-dispersant additives to the fuel. These issues were broadly described by, inter alia, Barker, Snape and Scurr [2], Quigeley, Barbour, Arters and Bush [11], Lacey, Gail, Kientz, Milanovic and Gris [9], and Żak, Ziemiański, Stępień and Wojtasik [19]. On the other hand, in the HPCR (High Pressure Common Rail) injectors, the coke deposits form around and on the edges of fuel outlet holes, but also on the walls inside the fuel channels of injector atomizers.…”

“…Moreover, added to the fuel as 1-litre premixes were mixtures of chemical compounds which according to the available results of tests performed at various laboratories have the greatest impact on the formation of various IDID [1,2,6,9,10,11,12,14,16]. The said pressures, where fuel heated up to 60 ºC returns many times from the injection systems overflows to the fuel tank, heating up the whole fuel system.…”

Nieporównywalność ocen paliw w europejskich znormalizowanych testach silnikowych

“…z inhibitorów korozji metaliczne katalizatory. Już śladowe zawartości takich pierwiastków jak Zn i Cu mogą znacznie przyspieszyć szybkość i zwiększyć ilość tworzonych osadów koksowych, zarówno wewnątrz kanalików wypływu paliwa, jak i wokół otworków wylotowych wtryskiwaczy paliwa [2,5,10,11]. W tablicy 3 zebrano, opisano i sklasyfikowano znaczenie różnic czynników mających wpływ na tworzenie zewnętrznych koksowych osadów wtryskiwaczy paliwa, w przypadku ocen prowadzonych na stanowiskach silnikowych zgodnie z procedurami badawczymi CEC F-23-01 i CEC F-98-08.…”

Evaluation of endurance characteristics for a modified diesel engine runs on jatropha biodiesel

“…It is commonly accepted that the formation of deposits around the injector may alter injection pattern and fuel flow rate inside combustion chamber which leads to deteriorations in overall system performance. The process of deposit formation is mainly influenced by fuel contaminants, reactive combustion products, soot and volatilized lubricating oil [8]. Agarwal et al [9] have conducted 512 h long-term engine operations with B20 LOME (Linseed oil methyl ester).…”