Page 34 - CARILEC CE Journal CEMAY2021

As a main fuel, the 32 LG engine can accept gas liquids ranging from liquid propane up to LFO. The special
low-viscosity and compressibility characteristics of fuels such as propane require that the fuel injection
is implemented with high pressure common rail technology in order to maintain adequate fuel injection
2
system component lifetimes. The main fuel is injected into the cylinder in liquid phase and is ignited by a
simultaneous injection of a relatively small amount of LFO pilot fuel. The pilot fuel system equally uses a
separate common rail system for precise metering of pilot fuel. Both main and pilot injectors are housed in a
common injector body. Figure 3 and 4 depict examples of single needle and multi-nozzle injector technology,
with 32LG applying the latter.

Figure 3 Wartsila 32/34 common Figure 4 Wartsila 32/34 twin needle
rail single needle injector injector with common rail pilot injector
housed in single injector body

Table 1 below represents a comparison summary of the main characteristics of the Wartsila 32 and 32LG.

Table 1 Parameter comparison Wartsila 32 and 32LG

2 Common Rail - A method of fuel injection that eliminates the principle of one pump per cylinder. The common rail is constructed from a series of accumulators
inter-connected by small-bore piping. The injection pressure is adjusted as desired and the injection timing (start and stop) controlled electronically. Wärtsilä has
also used common rail technology to develop the “smokeless engine”, which also reduces NOx and CO 2 emissions.

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