The Measurement And Analysis Of Nitrogen Oxide (NOx) For Marine Diesel Engine

Diesel engine is concern by people because of its relatively high thermal efficiency, have got the important function in the aspect of car and marine transporting, and at the same time, environment pollution problem caused by it also remains a vital consideration. Along with the world environmental worsen increasingly, the requests that control harmful emissions from engines are strong increasingly. To vehicle-use, all counties establish own laws that restrict exhaust and the laws are gradually rigorous. For effectively control the emissions from marine diesel engines, IMO issued the ANNEX VI of MARPOL convention, which has been carried out since January 1, 2000.According to the MARPOL convention, nitrogen oxide exhausts (NOx) emissions are defined as per engine power of NOx mass flow rate. But the NOx mass flow rate can't measure directly, the only method to get NOx mass flow rate is to know NOx concentration in the exhaust and the exhaust mass flow rate, then indirectly obtain the rate by calculation.This paper was detailed to introduce the measurement of main exhaust composition from Marine diesel engine. At the same time, this paper discusses the computational method to get exhaust mass flow rate by carbon balance method and carbon/oxygen balance method.For the sake of differentiation exhaust limits anent the different use diesel engine. Test and calculation have been done.Research point out that the three key factors, which determine the NOx emission, are maximum peak temperature rich oxygen concentration and the duration in which combustion products stay at high temperature, thereby in the section of diesel of diesel emission control measures, for lowing effectively the diesel engine NOx exhaust, in the section of diesel emission control measures, respectively narrate the methods to reduce the crucial discharges of diesel engine about NOx emission from engine inside disposal and engine outside purge.