A test device and test method for widening the lower limit of flammable gas combustion under plasma combustion

Abstract

The invention discloses a combustion lower limit broadening testing device and a combustion lower limit broadening testing method for a combustible gas under plasma assisted combustion. The combustion lower limit broadening testing device mainly comprises gas sources, corresponding gas paths, a plasma voltage source and a combustor, wherein the gas sources and corresponding gas path pipelines mainly comprise a combustible gas source and a combustible gas path as well as an air source and an air path; the combustor mainly comprises a primary mixer, a second mixer, an alundum tube, an electric heating wire heating tape, a detection cavity, a quartz tube, an outer electrode and an inner electrode. The combustion lower limit broadening testing device has the main advantages that the low-speed sufficient mixing of the combustible gas and air in a finite space is realized; the influence of an air flow speed on an ignition process is decreased; through the reasonable combination of parameters of different premixed gas concentrations, preheating temperatures, flow speeds, plasma strength and the like, the device can be used for researching the combustion lower limit broadening law of a low-concentration combustible gas under the conditions of plasma activation action and external enthalpy input; the technical support is provided for the reutilization of the low-concentration combustible gas.

Description

technical field [0001] The invention relates to the technical field of energy utilization and combustion, in particular to a test device and a test method for widening the lower limit of combustible gas combustion under plasma combustion. Background technique [0002] The combustible gas combustion limit under the action of plasma, especially the widening performance of the lower limit, is an important research direction in the field of energy and environmental science. This type of technology has a direct effect on the purification and reuse of industrial tail gas, which is commonly referred to as energy saving and emission reduction. . For example, under normal temperature and pressure, the lower limit of methane combustion is 5% volume concentration, while the concentration of methane in tail gas from mining or industrial discharge is often much lower than this value. Methane tail gas is allowed to be discharged freely, which is not only a waste of limited fossil energy,...

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Problems solved by technology

Because the volume concentration of low-concentration combustible gas is outside the lower limit of theoretical combustion, if there is no external factor applied, it cannot be ignited and sustained combustion under normal temperature and pressure. Technical means include plasma enhanced combustion and hyperenthalpy combustion, etc. For example, Zou Xin et al. "Influence of Voltage and Frequency on Flame in Methane Combustion Enhanced Experiment" on pages 31-35, Volume 35, Issue 1, "High Voltage Technology" in 2009 "In the article, a device is mentioned, which mainly studies the combustion-supporting effect of plasma dielectric barrier discharge on methane, but this device only activates methane alone when the gas plasma is activated, and then forms a mixture of methane and air, and finally in It is ignited at the outlet of the burner. The limitation of this type of device is that the degree of mixing cannot achieve sufficient mixing, and because the activation is only for a single gas working fluid, the activation efficiency is weakened

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