Disintegration of Carbon Dioxide Molecules in a Microwave Plasma Torch

摘要

A pure carbon dioxide torch is generated by making use of 2.45?GHz microwave. Carbon dioxide gas becomes the working gas and produces a stable carbon dioxide torch. The torch volume is almost linearly proportional to the microwave power. Temperature of the torch flame is measured by making use of optical spectroscopy and thermocouple. Two distinctive regions are exhibited, a bright, whitish region of high-temperature zone and a bluish, dimmer region of relatively low-temperature zone. Study of carbon dioxide disintegration and gas temperature effects on the molecular fraction characteristics in the carbon dioxide plasma of a microwave plasma torch under atmospheric pressure is carried out. An analytical investigation of carbon dioxide disintegration indicates that substantial fraction of carbon dioxide molecules disintegrate and form other compounds in the torch. For example, the normalized particle densities at center of plasma are given by n _CO2 / n _N ?=?6.12?×?10?3, n _CO / n _N ?=?0.13, n _C / n _N ?=?0.24, n _O / n _N ?=?0.61, n _C2 / n _N ?=?8.32?×?10?7, n _O2 / n _N ?=?5.39?×?10?5, where n _CO2 , n _CO , n _C , n _O , n _C2 , and n _O2 are carbon dioxide, carbon monoxide, carbon and oxygen atom, carbon and oxygen molecule densities, respectively. n _N is the neutral particle density. Emission profiles of the oxygen and carbon atom radicals and the carbon monoxide molecules confirm the theoretical predictions of carbon dioxide disintegration in the torch.