Simultaneous measurement of multi-component gases from pyrolysis of hydrocarbon fuels using absorption spectroscopy

Abstract

Endothermic hydrocarbon fuel is cracked into small hydrocarbons at high temperatures. Quantitative analysis of the pyrolysis product’s component concentration is of great significance for the analysis of engine combustion regenerative cooling technology and combustion efficiency. Off-axis integrated cavity output spectroscopy technique was adopted in laser absorption spectroscopy. Using the near-infrared spectroscopic properties of methane and ethylene, the component concentrations of methane and ethylene at different temperatures and cracking times were measured. In addition, a high temperature kerosene pyrolysis spectrum measurement system was built, and a concentration measurement error of not more than 3.2% was achieved. Pyrolysis experiment shows that at low temperatures and short heating times, the concentration of the components that crack methane and ethylene is low. Ethylene is the first to crack as the temperature rises, and it accounts for a relativity large proportion of the mixture. Other gases crack out with the increase of the cracking time. The component concentration of ethylene is basically stable at approximately 12%.