Abstract:

The objective of this investigation is to design sampling system of collecting exhaust emission by sampling bag and absorbing formaldehyde and unburned methanol in exhaust emission with pure water, to establish measurement system in which combine with gas chromatography and liquid chromatography to separate and measure formaldehyde and unburned methanol emissions, and to measure formaldehyde and unburned methanol emission during cold start by using this measurement method from a inlet port fuel injection sparkignition methanol engine by means of cyclebycycle control strategy. The results show that the combination method of gas chromatography and liquid chromatography may separate and measure the formaldehyde and unburned methanol emission effectively. The detection limits of formaldehyde and methanol for gas chromatography are 0.16 μg/mL and 0.18 μg/mL, respectively, and the detection limits of methanol is 0.15 μg/mL for liquid chromatography. This measurement method can satisfy measurement requirement for formaldehyde and unburned methanol of methanol engine.

Key words: power machinery and engineering, methanol engine, formaldehyde, unburned methanol, gas chromatography, liquid chromatography