The simultaneous air-staged combustion of methyl amine (CH3NH2) and methyl chloride (CH3CL) was studied in a two zone turbulent flow reactor at atmospheric pressure. The temperature in the first stage was held constant at 1750 K. The feed consisted of ethylene (C2H4), CH3NH2, CH3Cl, air and N2 (for first stage temperature control). Fuel-lean and fuel-rich mixtures were fed into the first stage. During the fuel-rich feed runs, secondary air was injected into the second stage to make the overall system fuel-lean. Measurements of species including NO, CO, CO2 and O2 were made in both stages. Three major observations were made: 1) The addition of CH3Cl during air staged combustion of CH3NH2 does not alter the attainment of an NO minimum emission from the second stage; 2) The optimal first stage equivalence ration corresponding to the minimum NO in the second stage outlet is approximately 1.3 in both cases; and 3) The minimum NO emission level from air staged combustion significantly decreases when CH3Cl is added to the feed at constant equivalence ratio. A perfectly stirred - plug flow sequential reactor simulation is used with a detailed chemical reaction mechanism to model the observed species concentrations. The experimental data are well predicted, especially the staged combustion NO minimums. Model-based rate of production calculations suggests that the loss of OH radicals via OH + HCl = H2O + Cl and the consumption of N radicals via N + Cl + M = NCl + M slow the reaction N + OH = NO + H, leading to the reduced NO minimum emission during the simultaneous air-staged combustion of the fuel-bound chlorine and nitrogen species.
All Science Journal Classification (ASJC) codes
- General Chemistry
- General Chemical Engineering
- Fuel Technology
- Energy Engineering and Power Technology
- General Physics and Astronomy