LSJ Series
The LSJ Series is an engine that combines the LSH Series with the UE engine’s independently-developed technologies of complete combustion and stratiform water injection in order to meet the SOx global cap of only using MGO or A heavy oil in or after 2020. It achieves a significantly lower fuel consumption (improving fuel efficiency by about 5% compared to the previous model) while clearing NOx regulations. Combined with our own technology - low-pressure EGR or low-pressure SCR system, it is possible to clear Tier III regulations.
The LSJ Series is the first engine that was developed with J-ENG’s JUMP concept solution.
The first UEC50LSJ-EGR engine was completed in May 2018. The UEC42LSJ is currently under development, with a projected conclusion of March 2022.
※The development of 50LSJ is supported by Japan Foundation.
The Merits of Using MGO (distillate fuel)
Similar to MDO and distillate fuel, marine gas oil (MGO) is a high-quality and environmentally-friendly fuel compared to HSFO（heavy fuel oil）, which has been used in marine diesel engines up to now. Although the price is a bit high, it has good flammability, reducing engine trouble, and there are no issues with availability. Also, using a single MGO fuel makes the system simple, which leads to keeping the capital investment, operation, and ship maintenance costs low.
Fuel tanks, pumps, purifiers, filters, and heat race piping are among the on-board devices that can be significantly reduced and made to be more compact.
This leads to low fuel consumption, which can offset the high price of the fuel.
Feature of MGO(distillate fuel) and the other fuels
| MGO, MDO | VLSFO (Compliant fuel) | HSFO (Heavy fuel oil) | LNG | |
| Fuel price | Expensive | Relatively Expensive Close to MGO? |
Cheap | Close to HFO |
| Fuel availability | Good | Good | Good at present In future? |
Limited |
| Fuel property | Good | No specification Fuel stability / Fuel compatibility Long ignition delay / Poor combustion Higher pour point FCC(cat fine) |
Same as the present | Good |
| System | Very simple due to mono fuel / no heating system | same as the present | SOx scrubber | DF engine + LNG tank and supply system |
| Additional initial cost | Small | Unnecessary | Very large | Huge |
| Operation | Easy | same as the present | Complicated | Very complicated system Only by skillful engineer |
| Other aspect | Higher engine reliability and less maintenance | Concerned about the engine and fuel system trouble | Limited production and dock capacity for installing SOx scrubber Limited scrubbing water dischange area |
Environment friendly SOx/PM/CO2/(NOx) |
| Application | Very potintial solution with MGO mono-fuel engine UEC-LSJ | Majority | Limited | Very limited |