Abstract
Current diesel engine aftertreatment systems, such as Selective Catalyst Reduction (SCR) use ammonia (NH3) to reduce Nitrogen Oxides (NOx) into Nitrogen (N2) and water (H2O). However, if the reaction between NH3 and NOx is unbalanced, it can lead either NH3 or NOx being released into the environment. As NH3 is classified as a dangerous compound in the environment, its accurate measurement is essential. Tuneable Diode Laser (TDL) spectroscopy is one of the methods used to measure raw emissions inside engine exhaust pipes, especially NH3. This instrument requires a real-time exhaust temperature, pressure and other interference compounds in order to adjust itself to reduce the error in NH3 readings. Most researchers believed that exhaust temperature and pressure were the most influential factors in TDL when measuring NH3 inside exhaust pipes. The aim of this paper was to quantify these interference effects on TDL when undertaking NH3 measurement. Surprisingly, the results show that pressure was the least influential factor when compared to temperature, H2O, CO2 and O2 when undertaking NH3 measurement using TDL.
Highlights
Diesel engine vehicles have been very popular in the past decade, because of their comparative fuel economy
The literature does not include numerical values to quantify the extent of exhaust temperature, pressure and other interferences on NH3 readings using Tuneable Diode Laser (TDL) directly inside the exhaust pipe, because this require high cost to undertake this type of experimental test
After the NH3 readings were recorded three times as show in Table 5, it is clear that temperature, pressure and other interference compounds can have a huge effect on the TDL during NH3 measurement
Summary
Diesel engine vehicles have been very popular in the past decade, because of their comparative fuel economy. For this paper used type of TDL that fitted inside the exhaust pipe and measure NH3 directly inside the engine exhaust pipe Which means that both transmitter and receiver units are. The literature does not include numerical values to quantify the extent of exhaust temperature, pressure and other interferences on NH3 readings using TDL directly inside the exhaust pipe, because this require high cost to undertake this type of experimental test. This paper investigates the effect of temperature, pressure and other compounds on the TDL correction factor for NH3 measurement directly inside exhaust pipe by manually adjusting these factors within the TDL software, which means that those are not the real-time values of temperature, pressure, H2O, CO2, and O2 within the exhaust
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