What is the difference between dual fuel diesel engine and RCCI engine? Considering that both engines use dual fuel, can be said that RCCI is a type of dual fuel engine?
RCCI uses in-cylinder fuel blending with at least two fuels of different reactivity and multiple injections to control in-cylinder fuel reactivity to optimize combustion phasing, duration and magnitude. The process involves introduction of a low reactivity fuel into the cylinder to create a well-mixed charge of low reactivity fuel, air and recirculated exhaust gases. The high reactivity fuel is injected before ignition of the premixed fuel occurs using single or multiple injections directly into the combustion chamber. Examples of fuel pairings for RCCI are gasoline and diesel mixtures, ethanol and diesel, and gasoline and gasoline with small additions of a cetane-number booster (di-tert-butyl peroxide (DTBP)).
RCCI allows optimization of HCCI and Premixed Controlled Compression Ignition (PCCI) type combustion in diesel engines, reducing emissions without the need for after-treatment methods. By appropriately choosing the reactivities of the fuel charges, their relative amounts, timing and combustion can be tailored to achieve optimal power output (fuel efficiency), at controlled temperatures (controlling NOx) with controlled equivalence ratios (controlling soot).
DUAL FUEL ENGINE is designed to simultaneously operate with a liquid fuel and a gaseous fuel, both fuels being metered separately, the consumed amount of one of the fuels relative to the other one being able to vary depending on the operation.
OR
an engine designed to operate on a combination of alternative fuel, such as compressed natural gas (CNG) or liquefied petroleum gas (LPG), and conventional fuel, such as diesel or gasoline. These engines have two separate fuel systems, which either inject both fuels simultaneously into the engine combustion chamber or fumigate the gaseous fuel with the intake air and inject the liquid fuel into the combustion chamber.
Conclusion:
Yes, its possible to say RCCI engine is Types of Dual Fuel Engine.
According to the study of Galal et al 2010, it said: the use of compressed natural gas (CNG), as an alternative to conventional fuels will result in low levels of emissions, but the use of CNG as the main fuel in a diesel engine with the diesel fuel used as an igniter has always been associated with some problems. The main problem in such a dual-fuel engine is the increased tendency toward detonation because of the high compression ratio of the engine.
The results of the investigation indicate that the dual-fuel engine can operate detonation-free for a compression ratio of 16.5 with certain type of motor and also indicate that dual-fuel engines are lower than diesel engines in brake thermal efficiency, brake power, and brake mean effective pressure at all loads. On the other hand, CO and NO emissions are higher at high loads but at low loads, dual-fuel engines give lower NO.
Teshome Kumsa
Thank you for your comprehensive and complete explanation.
can we say the dual fuel engine is RCCI when the gas (for example natural gas) injected to manifold and diesel fuel inject in to combustion cylinder to ignite the fuel blend?
Irma Janet ZEGARRA Tello
Thank you for your answer.
I think you just explain the dual fuel but my question is the difference the RCCI and dual fuel engine when the gas fuel (biogas or natural gas)injected to engine from manifold then ignited by diesel fuel. In my opinion, this is no different from the RCCI diesel engine.is it correct؟
can we say the dual fuel engine is RCCI when the gas (for example natural gas) injected to manifold and diesel fuel inject in to combustion cylinder to ignite the fuel blend?
As my point of view and as per my knowledge just the engine used two fuels for combustion even though the position of injection and mixing point classify them odd.
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