Numerical Simulation of the Combustion Stability for Low Concentration Methane in a Perfectly-stirred Reactor

摘要

The combustion stability of low concentration methane in a perfectly-stirred reactor is numerically studied by Chemkin software and GRI-Mech 3.0 mechanisms, considering the influence factors of residence time, methane concentration, preheating temperature and heat loss, the following conclusions can be drawn: (1) To maintain low concentration methane combustion stability, it is need to make the residence time in the reactor larger than the critical residence time or the mass flow rate less than the critical mass flow rate. (2) To make the methane concentration below 4% combustion stability, it should be preheated to improve chemical reaction speed, methane concentration decreased by 1%, corresponding to increasing preheating temperature of about 200K. (3) Heat loss can significantly reduce the initial temperature, and thus lead to reduce the critical mass flow. The key factor of control the heat loss is reinforces insulation measures or reduces the heat transfer coefficient.