A method for determining the relative reactivity of volatile organic compounds (VOCs) with respect to the air plasma of a pulsed corona discharge is proposed. It is based on the use of specially selected mixtures of organic compounds. The approach is based on the method of competing reactions: all components of the mixture are in equal conditions, so the relative reactivity can be determined with high accuracy using the gas chromatography. The parameters of scaling processes are proposed – plasma chemical yield, relative reactivity, formal reagent as a set of plasma components. In this paper, using the example of a number of VOCs, we demonstrate the extended capabilities of the method using a special technique for processing experimental data. More accurate data on the relative reactivity of a number of VOCs of wide application have been obtained. It is proposed to use the energy yield of ozone as a criterion for the energy efficiency of a plasma chemical installation.
Обнаружено каталитическое влияние электроотрицательных добавок (ССl4 и фреона-113) на процессы конверсии летучих органических соединений под действием неравновесной плазмы атмосферного давления, генерируемой импульсным коронным разрядом. Показано, что данные добавки в концентрации менее 0.1% значительно уменьшают ток разряда, но при этом энергетическая эффективность процесса удаления летучих органических соединений возрастает. На примере удаления паров перхлорэтилена (ПХЭ, C2Cl4) количественно продемонстрировано каталитическое влияние электроотрицательных добавок на процесс конверсии в воздухе и азоте. Так, добавка 0.085% CCl4 в воздух позволяет снизить энергозатраты при удалении ПХЭ с концентрацией 0.09% в 2 раза (с 12 до 6 eV / molecule при степени очистки 63%). Предложены механизмы активного влияния электроотрицательных добавок на ток разряда и на процессы удаления примесей. DOI: 10.21883/PJTF.2017.24.45348.16857
The results are given of detailed experimental studies of the
model flue gas mixture irradiation by pulsed electron beams and
electron-beam-initiated non-self-sustained discharges. The effects of the
electron beam parameters, the external electric field and the composition
of irradiated gas on the process of sulphur dioxide SO2 removal are
analysed. We demonstrate the existence of optimum values of the electron
beam current density and pulse duration, and of the external electric
field strength, at which the energy required to remove one SO2 molecule
is minimum. The energy cost and removal rate are given as functions of the
concentration of SO2, oxygen and water vapour in the mixture. The
concentration limit that divides the chain and radical mechanisms of
SO2 removal is determined.
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