1994 Volume 29 Issue 6 Pages 422-429
In this paper we compare NOx emission of low speed engine with that of high speed engine adopting original numerical simulation program of NOx emission.
Further NOx emission of low speed engine, which was experimentally measured at the shop trial, was statistically treated with driving condition and weather condition.
Measured engines are MAN-B&W type 2-stroke diesel engine. And JIS A oil as a fuel was used in the test.
Consequently, we obtained conclusions as follows.
(1) NOx genelation of low speed engine is not differant essentially from that of high speed engine. However, NOx emission of low speed engine is more dependent on staying time at higher gas temperature than high speed engine.
(2) In case of higher scavenging air temperature, NOx emission is increased, however it is little influenced by the scavenging air pressure and exhaust gas temperature.
(3) In case of increasing explosion ratio, NOx emission increase.
(4) Increasing the load, NOx emission increase, and there is maximum value at near of the 90% load.
(5) NOx emission is dependent on the fuel injection nozzle.
(6) NOx emission of low speed engine is more insensible to the humidity than that of high speed engine.
