“String” type of barrierless plasma chemical reactor for generation ozone from air
The efficiency of ozone generation for barrierless plasma chemical reactors with different cathode designs was compared. The characteristics of ozone generation for a plasma chemical reactor with a string-type cathode in comparison with the previously developed star-shaped cathode for different comb...
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України
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Kudin, D.V. Zavada, L.М. Opalev, P.O. Kotukov, O.V. Khmelevska, V.F. 2023-11-29T10:45:40Z 2023-11-29T10:45:40Z 2021 “String” type of barrierless plasma chemical reactor for generation ozone from air / D.V. Kudin, L.М. Zavada, P.O. Opalev, O.V. Kotukov, V.F. Khmelevska // Problems of atomic science and tecnology. — 2021. — № 1. — С. 88-91. — Бібліогр.: 8 назв. — англ. 1562-6016 PACS: 52.80.Hc, 52.90.+z,52.75.−d. https://nasplib.isofts.kiev.ua/handle/123456789/194738 The efficiency of ozone generation for barrierless plasma chemical reactors with different cathode designs was compared. The characteristics of ozone generation for a plasma chemical reactor with a string-type cathode in comparison with the previously developed star-shaped cathode for different combinations of bias and pulsed components of voltage have been investigated. The special feature of the operation of a plasma-chemical reactor with a string cathode is revealed. There is consisting in the absence of dependence of the transition of the discharge combustion mode into the spark breakdown phase from the presence of a bias voltage. Проведено порівняння ефективності напрацювання озону для безбар’єрних плазмохімічних реакторів з різними конструкціями катодів. Досліджено особливості генерації озону для плазмохімічного реактора з катодом “струнного” типу порівняно з розробленим раніше зіркоподібним катодом для різних комбінацій постійних та імпульсних складових живлення. Виявлена особливість роботи плазмохімічного реактора зі струнним катодом, що полягає у відсутності залежності переходу режиму горіння розряду у фазу іскрового пробою від наявності постійної складової комплексного живлення. Проведено сравнение эффективности наработки озона для безбарьерных плазмохимических реакторов с различными конструкциями катодов. Исследованы особенности генерации озона для плазмохимического реактора с катодом “струнного” типа по сравнению с разработанным ранее звездообразным катодом для различных комбинаций постоянных и импульсных составляющих питания. Выявлена особенность работы плазмохимического реактора со струнным катодом, которая заключается в отсутствии зависимости перехода режима горения разряда в фазу искрового пробоя от наличия постоянной составляющей комплексного питания. en Національний науковий центр «Харківський фізико-технічний інститут» НАН України Вопросы атомной науки и техники Low temperature plasma and plasma technologies “String” type of barrierless plasma chemical reactor for generation ozone from air Безбар’єрний реактор “струнного” типу для генерації озону з повітря Безбарьерный реактор “струнного” типа для генерации озона из воздуха Article published earlier |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| title |
“String” type of barrierless plasma chemical reactor for generation ozone from air |
| spellingShingle |
“String” type of barrierless plasma chemical reactor for generation ozone from air Kudin, D.V. Zavada, L.М. Opalev, P.O. Kotukov, O.V. Khmelevska, V.F. Low temperature plasma and plasma technologies |
| title_short |
“String” type of barrierless plasma chemical reactor for generation ozone from air |
| title_full |
“String” type of barrierless plasma chemical reactor for generation ozone from air |
| title_fullStr |
“String” type of barrierless plasma chemical reactor for generation ozone from air |
| title_full_unstemmed |
“String” type of barrierless plasma chemical reactor for generation ozone from air |
| title_sort |
“string” type of barrierless plasma chemical reactor for generation ozone from air |
| author |
Kudin, D.V. Zavada, L.М. Opalev, P.O. Kotukov, O.V. Khmelevska, V.F. |
| author_facet |
Kudin, D.V. Zavada, L.М. Opalev, P.O. Kotukov, O.V. Khmelevska, V.F. |
| topic |
Low temperature plasma and plasma technologies |
| topic_facet |
Low temperature plasma and plasma technologies |
| publishDate |
2021 |
| language |
English |
| container_title |
Вопросы атомной науки и техники |
| publisher |
Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| format |
Article |
| title_alt |
Безбар’єрний реактор “струнного” типу для генерації озону з повітря Безбарьерный реактор “струнного” типа для генерации озона из воздуха |
| description |
The efficiency of ozone generation for barrierless plasma chemical reactors with different cathode designs was compared. The characteristics of ozone generation for a plasma chemical reactor with a string-type cathode in comparison with the previously developed star-shaped cathode for different combinations of bias and pulsed components of voltage have been investigated. The special feature of the operation of a plasma-chemical reactor with a string cathode is revealed. There is consisting in the absence of dependence of the transition of the discharge combustion mode into the spark breakdown phase from the presence of a bias voltage.
Проведено порівняння ефективності напрацювання озону для безбар’єрних плазмохімічних реакторів з різними конструкціями катодів. Досліджено особливості генерації озону для плазмохімічного реактора з катодом “струнного” типу порівняно з розробленим раніше зіркоподібним катодом для різних комбінацій постійних та імпульсних складових живлення. Виявлена особливість роботи плазмохімічного реактора зі струнним катодом, що полягає у відсутності залежності переходу режиму горіння розряду у фазу іскрового пробою від наявності постійної складової комплексного живлення.
Проведено сравнение эффективности наработки озона для безбарьерных плазмохимических реакторов с различными конструкциями катодов. Исследованы особенности генерации озона для плазмохимического реактора с катодом “струнного” типа по сравнению с разработанным ранее звездообразным катодом для различных комбинаций постоянных и импульсных составляющих питания. Выявлена особенность работы плазмохимического реактора со струнным катодом, которая заключается в отсутствии зависимости перехода режима горения разряда в фазу искрового пробоя от наличия постоянной составляющей комплексного питания.
|
| issn |
1562-6016 |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/194738 |
| citation_txt |
“String” type of barrierless plasma chemical reactor for generation ozone from air / D.V. Kudin, L.М. Zavada, P.O. Opalev, O.V. Kotukov, V.F. Khmelevska // Problems of atomic science and tecnology. — 2021. — № 1. — С. 88-91. — Бібліогр.: 8 назв. — англ. |
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ISSN 1562-6016. ВАНТ. 2021. №1(131)
88 PROBLEMS OF ATOMIC SCIENCE AND TECHNOLOGY. 2021, №1. Series: Plasma Physics (27), p. 88-91.
https://doi.org/10.46813/2021-131-088
“STRING” TYPE OF BARRIERLESS PLASMA CHEMICAL REACTOR
FOR GENERATION OZONE FROM AIR
D.V. Kudin, L.М. Zavada, P.O. Opalev, O.V. Kotukov, V.F. Khmelevska
National Science Center “Kharkov Institute of Physics and Technology”, Kharkiv, Ukraine
E-mail: opalev@kipt.kharkov.ua
The efficiency of ozone generation for barrierless plasma chemical reactors with different cathode designs was
compared. The characteristics of ozone generation for a plasma chemical reactor with a string-type cathode in
comparison with the previously developed star-shaped cathode for different combinations of bias and pulsed
components of voltage have been investigated. The special feature of the operation of a plasma-chemical reactor
with a string cathode is revealed. There is consisting in the absence of dependence of the transition of the discharge
combustion mode into the spark breakdown phase from the presence of a bias voltage.
PACS: 52.80.Hc, 52.90.+z,52.75.−d.
INTRODUCTION
The high efficiency of the using ozonation for
bactericidal water treatment [1], control of biological
contamination of grain [2, 3] and other bactericidal
applications has long been known. Recently, due to the
spread of a new strain of coronavirus, attention to
mobile technologies of sterilization and disinfection has
increased significantly.
The main chemical reagent of ozonation technology
- ozone can be produced "in situ" in a plasma chemical
reactor from air or oxygen. Due to the high oxidizing
ability of ozone, this technology allows you to
effectively disinfect water, surfaces and bulk substances
[4].
But for the most common in ozone generation
technologies use plasma chemical reactor with dielectric
barriers have a big problem in the low service life if
ordinary air is used as the working gas, as well as the
impossibility of restoring the dielectric barrier after
transition of discharge in spark mode. Barrierless
plasma chemical reactors based on a combination of a
star-shaped cathode and a cylindrical anode developed
at NSC KIPT haven't the above-mentioned problems
and are also highly mobile and reliable [5]. In addition,
it was demonstrated that such plasma chemical reactors
can be used not only in ozone generation systems, but
also in systems for controlling the content of volatile
hydrocarbon compounds in the air [6,7]. But the heavy
weight of the electrode system and the cost of its
manufacture significantly reduce the competitive
advantages of this type of system. The barrierless
plasma cathodic systems with star-shaped cathodes to
long-term using (more than a year) require
maintenance, which also negatively affects their
commercial attractiveness.
A possible alternative to using a star-shaped cathode
is to replace it with another type of barrierless cathode,
such as one consisting of stretched thin strings. The
paper compares the efficiency of using star-shaped and
string structures of electrodes to generate ozone from
the air at different air flow rates through the plasma
chemical reactor and the values of bias voltage [8].
EXPERIMENTAL SETUP
To increase the competitiveness of barrierless
plasma chemical systems, in contrast to pre-designed
electrode systems with a cathode consisting of a large
number of star-shaped electrodes, was design new type
of barrierless plasma chemical reactor - string. Photos of
the central part of the reactors are shown in Fig.1. The
tubular cylindrical carbon anode (see shown in Fig. 1
next to the string electrode) is the same for both types of
reactors.
а b
Fig. 1. Photos string (a) and star-shaped (b) electrods
The star-shaped cathode consisted of 100 "stars"
with a diameter of 27 mm with 30 beams placed on a
metal rod at a distance of 2.5 mm. The weight was
3.6 kg.
The string cathode consisted of 12 stretched by
means of a special design pieces of metal wire with a
thickness of 0.15 mm. The weight was 2.7 kg.
The advantages of the string cathode design are low
weight and lower price.
To compare the efficiency of ozone generation, we
used an experimental stand consisting of an air
compressor SECOH, a switching power supply with
variable systems for forming bias voltage, flow meters,
ISSN 1562-6016. ВАНТ. 2021. №1(131) 89
power meter, ozone concentration meter Teledyne API
Model 454 and oscilloscope. Photo stand shown in
Fig. 2.
Fig. 2. Photo of experimental stand
The scheme of the experimental stand is shown in
Fig. 3.
Fig. 3. Basic scheme of the experimental setup
High-voltage pulsed power supply forms high-
voltage pulses of microsecond duration (1300 ns) with a
pulse repetition rate of 1...15 kHz and amplitude up to
15 kV. The rise time of the pulse is 500 ns. The current
pulse was recorded using a current shunt.
A characteristic oscillogram of the voltage pulse at
complex power supply is shown in Fig. 4.
Fig. 4. The characteristic oscillogram of the supply
voltage pulse of plasma chemical reactors
The supply voltage supplied to the plasma chemical
reactor consists of DC (bias voltage) and pulse
components. For this case, the pulse repetition
frequency was 14.89 kHz, the bias voltage was 1.6 kV,
and the total pulse amplitude was 11.4 kV. It should be
noted that these parameters of the complex power
supply of the reactor are optimal for long-term operation
and efficiency of reactors with star-shaped cathodes [8].
The electric signals were recorded with a Tektronix
TDS-2024 digital oscilloscope, bandwidth of 100 MHz.
Measurements of ozone concentration in the air were
performed with a ozone concentration meter Teledyme
API Model 454 with an accuracy of 0.1 g/m
3
.
RESULTS
Energy consumption for the generation of grams of
ozone is determined by the formula:
where w ‒ specific energy consumption, P – energy
consumed W, t ‒ time, с - ozone concentration, f – air
flow through the plasma chemical reactor.
String and star-shaped reactors were tested to
compare the efficiency of ozone generation at different
air flows through a plasma chemical reactor at the same
power, which is applied in the discharge (104 W) and
the same power parameters (bias voltage ‒ 1600 V).
The test results are shown in Fig. 5.
Fig. 5. The dependence of ozone concentration on air
flow through a plasma chemical reactor for power
applied in the discharge of 104 W
It is seen that for this case the efficiency of ozone
generation, i.e. energy consumption for ozone
generation doesn't differ significantly.
It should be noted that the applied power at the level
of 104 W is the maximum for the cathode of the string
type without the transition of the mode of the discharge
in the mode of spark breakdown. The maximum power
that can be applied in a reactor with star-shaped
cathodes is 126 W.
For a string reactor the ignition voltage of discharge
decreases by 1 kV with increasing bias voltage from 0
to 1600 V, and for a star-shaped electrode the ignition
voltage gradually decreases by 2 kV with increasing
bias voltage from 0 to 1000 V, and then increases
sharply at 1.5 kV with a bias voltage at the level of
90 ISSN 1562-6016. ВАНТ. 2021. №1(131)
1600 V for which the most stable long-term operation
and maximum productivity are recorded.
It should be noted that the applied power in the
discharge at the level of 104 W for a reactor with a star-
shaped cathode can be achieved only by using a
complex voltage of power supply with a bias voltage,
without a bias voltage, the maximum power that can be
applied in the reactor the phase of the spark breakdown
with a star-shaped electrode doesn't exceed 90 W.
In Fig. 6 the graph of ozone concentration
dependence for string and star-shaped cathodes
depending on the value of the bias voltage of power
supply voltage in the range 0...2000 V (for air flow
through the reactor 1.6 m
3
/h) is given.
Fig. 6. Dependence of ozone concentration on the bias
voltage at the same power, which is applied in the
discharge and air flow through the plasma chemical
reactor at the level of 1.6 m
3
/h
It is seen that the ozone concentration for the string
cathode (blue curve) differs at the level of measurement
error, and for the star-shaped has a significant
correlation with the value of bias voltage [8]. In Fig. 7
shows the dependence of the ozone concentration for
the string cathode on the air flow through the plasma
chemical reactor for the bias voltage at the level of 0
and 1600 V and the star-shaped reactor with a bias
voltage of 1600 V.
Fig. 7. Dependence of ozone concentration on air flow
through a plasma chemical reactor
It is seen that the concentration of ozone doesn’t
differ significantly for different flow rate with a bias
voltage and without.
Thus, for a plasma reactor of string type, there is no
effect on the efficiency of ozone generation of the bias
voltage, which has a significant effect on the stability
and efficiency of ozone generation for reactors with a
star-shaped cathode. The efficiency of ozone generation
for both types of electrodes in a wide range of air flow
through the plasma chemical reactor differs at a level
less than the measurement error. The physical
preconditions for the difference in the influence of the
bias voltage should be studied in more detail, but it can
be assumed that they are related to the difference in the
formation of the bulk charge region for different
electrode geometries.
CONCLUSIONS
A new design of a barrierless plasma chemical
reactor for ozone generation was developed,
manufactured and tested. Studies have shown a slight
difference in the efficiency of ozone generation for both
types of reactors. The string modification of the central
cathode turned out to be 50 % lighter and cheaper to
manufacture compared to the star-shaped cathode and
looks like a promising way to further upgrade the
barrierless ozonators.
Also, the absence dependence of the transition to the
discharge mode to the phase of spark breakdown from
the value of bias voltage for string cathode is fixed.
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Article received 05.01.2021
БЕЗБАРЬЕРНЫЙ РЕАКТОР «СТРУННОГО» ТИПА ДЛЯ ГЕНЕРАЦИИ ОЗОНА ИЗ ВОЗДУХА
Д.В. Кудин, Л.М. Завада, П.O. Опалев, O.В. Котюков, В.Ф. Хмелевская
Проведено сравнение эффективности наработки озона для безбарьерных плазмохимических реакторов с
различными конструкциями катодов. Исследованы особенности генерации озона для плазмохимического
реактора с катодом «струнного» типа по сравнению с разработанным ранее звездообразным катодом для
различных комбинаций постоянных и импульсных составляющих питания. Выявлена особенность работы
плазмохимического реактора со струнным катодом, которая заключается в отсутствии зависимости
перехода режима горения разряда в фазу искрового пробоя от наличия постоянной составляющей
комплексного питания.
БЕЗБАР’ЄРНИЙ РЕАКТОР «СТРУННОГО» ТИПУ ДЛЯ ГЕНЕРАЦІЇ ОЗОНУ З ПОВІТРЯ
Д.В. Кудін, Л.М. Завада, П.O. Опалєв, O.В. Котюков, В.Ф. Хмелівська
Проведено порівняння ефективності напрацювання озону для безбар’єрних плазмохімічних реакторів з
різними конструкціями катодів. Досліджено особливості генерації озону для плазмохімічного реактора з
катодом «струнного» типу порівняно з розробленим раніше зіркоподібним катодом для різних комбінацій
постійних та імпульсних складових живлення. Виявлена особливість роботи плазмохімічного реактора зі
струнним катодом, що полягає у відсутності залежності переходу режиму горіння розряду у фазу іскрового
пробою від наявності постійної складової комплексного живлення.
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