Investigation on plasma-quenching efficiency of various gases using the inductively coupled thermal plasma technique: effect of various gas injection on Ar thermal ICP

Abstract

Application of the inductively coupled thermal plasma (ICTP) technique was proposed for investigating plasma-quenching efficiency of various gases including the arc-quenching medium of SF6. The ICTP enables us to study fundamentally the effect of gas injection on thermal plasma without any impurities because it has no electrode. Seven kinds of gases including CO2, SF6 and environmentally benign gases (N2, O2, air, He and H2) were injected into Ar ICTP. Spectroscopic observation was carried out in order to investigate a change in the excited state of Ar atoms due to addition of these gases. Radial distributions of the radiation intensity of Ar spectral lines and the temperature of Ar ICTP were estimated. It was found that 10% CO2 addition causes a remarkable decline of the radiation intensity and temperature at any radial position, similarly to 2% SF6 addition. Two-dimensional local thermal equilibrium modelling for Ar ICTP also revealed that CO2 causes temperature decay more than the other gases of N2, O2, air, He and H2 except SF6.

Controlling the number of excited atoms flowing into the reaction chamber using pulse-modulated induction thermal plasmas at atmospheric pressure

“…The PMITP can also be used for the fundamental investigation of transient thermal plasmas, such as switching arcs in a circuit breaker [18,19].…”

Modeling of Ar Induction Thermal Plasma with an Injection of PTFE Powder

“…Details of this torch were described in Ref. (1). Powder is injected from the top along the torch axis together with carrier gas.…”

“…It is therefore important to investigate the effects of soild PTFE contacting thermal plasma or arc plasma. Y. Tanaka et al have been studying arc-quenching properties of various gases using an inductively coupled thermal plasma (ICTP) apparatus (1) (3) . The distinguishing feature of the ICTP is to produce clean plasma without any electrode.…”

Observation of non-chemical equilibrium effect on Ar–CO2–H2 thermal plasma model by changing pressure

“…The ICTP technique has some advantages for fundamental and comparative study of gas-plasma interactions both in numerical and experimental approaches [3] since it is free from any contamination. Moreover, in recent days researchers have found some attributes of plasma extinguishing capability and plasma shrinkage in case of molecular gas injection [4,5].…”

“…Secondly, the calculation outputs such as temperature field and mass fraction distributions are demonstrated. Thirdly, the Ar-CO 2 -H 2 ICTP simulation is carried out using two different models i.e., the present one-temperature chemically non-equilibrium (1T-NCE) model and a one-temperature chemically equilibrium (1T-CE) model [3]. For detailed examination of chemical non-equilibrium effects, 1T-NCE calculations under three different pressures were done because it is thought to believe that non-chemical equilibrium affects more at reduced pressure than under normal pressure.…”