Design and investigation of HF-ozonators
In the present activity the ozonators with the time modulated power supplies and reactors (plate-type and tubular) operating on the base of surface barrier discharge are investigated. The measurements of the main specifications of the reactor at the average power level up to 50W were performed using...
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Krasnyj, V.V. Klosovskij, A.V. Nezovibat’ko, Yu.N. Pogozhev, D.P. Taran, V.S. Shvets, O.M. Utemov, D.N. 2015-05-29T09:00:49Z 2015-05-29T09:00:49Z 2000 Design and investigation of HF-ozonators / V.V. Krasnyj, A.V. Klosovskij, Yu.N. Nezovibat’ko, D.P. Pogozhev, V.S. Taran, O.M. Shvets, D.N. Utemov // Вопросы атомной науки и техники. — 2000. — № 3. — С. 144-146. — Бібліогр.: 5 назв. — англ. 1562-6016 https://nasplib.isofts.kiev.ua/handle/123456789/82404 533.9 In the present activity the ozonators with the time modulated power supplies and reactors (plate-type and tubular) operating on the base of surface barrier discharge are investigated. The measurements of the main specifications of the reactor at the average power level up to 50W were performed using spectroscopy diagnostic. The relationships of the output concentration of ozone on the temperature of the reactor, frequency and power of a source, air injection rates were obtained and discussed in detail. In addition, on the basis of the performed experiments the geometrical parameters of reactors were optimized. Some types of reactors and power supplies with the power up to 500W were designed. The prototypes of ozonators for medical purposes, agriculture and household applications have been manufactured. en Національний науковий центр «Харківський фізико-технічний інститут» НАН України Вопросы атомной науки и техники Low Temperature Plasma and Plasma Technologies Design and investigation of HF-ozonators Article published earlier |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine |
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DSpace DC |
| title |
Design and investigation of HF-ozonators |
| spellingShingle |
Design and investigation of HF-ozonators Krasnyj, V.V. Klosovskij, A.V. Nezovibat’ko, Yu.N. Pogozhev, D.P. Taran, V.S. Shvets, O.M. Utemov, D.N. Low Temperature Plasma and Plasma Technologies |
| title_short |
Design and investigation of HF-ozonators |
| title_full |
Design and investigation of HF-ozonators |
| title_fullStr |
Design and investigation of HF-ozonators |
| title_full_unstemmed |
Design and investigation of HF-ozonators |
| title_sort |
design and investigation of hf-ozonators |
| author |
Krasnyj, V.V. Klosovskij, A.V. Nezovibat’ko, Yu.N. Pogozhev, D.P. Taran, V.S. Shvets, O.M. Utemov, D.N. |
| author_facet |
Krasnyj, V.V. Klosovskij, A.V. Nezovibat’ko, Yu.N. Pogozhev, D.P. Taran, V.S. Shvets, O.M. Utemov, D.N. |
| topic |
Low Temperature Plasma and Plasma Technologies |
| topic_facet |
Low Temperature Plasma and Plasma Technologies |
| publishDate |
2000 |
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English |
| container_title |
Вопросы атомной науки и техники |
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
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Article |
| description |
In the present activity the ozonators with the time modulated power supplies and reactors (plate-type and tubular) operating on the base of surface barrier discharge are investigated. The measurements of the main specifications of the reactor at the average power level up to 50W were performed using spectroscopy diagnostic. The relationships of the output concentration of ozone on the temperature of the reactor, frequency and power of a source, air injection rates were obtained and discussed in detail. In addition, on the basis of the performed experiments the geometrical parameters of reactors were optimized. Some types of reactors and power supplies with the power up to 500W were designed. The prototypes of ozonators for medical purposes, agriculture and household applications have been manufactured.
|
| issn |
1562-6016 |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/82404 |
| citation_txt |
Design and investigation of HF-ozonators / V.V. Krasnyj, A.V. Klosovskij, Yu.N. Nezovibat’ko, D.P. Pogozhev, V.S. Taran, O.M. Shvets, D.N. Utemov // Вопросы атомной науки и техники. — 2000. — № 3. — С. 144-146. — Бібліогр.: 5 назв. — англ. |
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2025-11-25T21:34:10Z |
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| fulltext |
UDC 533.9
Problems of Atomic Science and Technology. 2000. N 3. Series: Plasma Physics (5). p. 144-146 144
DESIGN AND INVESTIGATION OF HF-OZONATORS
Krasnyj V.V, Klosovskij A.V, Nezovibat’ko Yu.N, Pogozhev D.P, Taran V.S,
Shvets O.M, Utemov D.N.
Institute of Plasma Physics of National Science Center «Kharkov Institute of Physics and
Technology» 1, Akademicheskaya St, 61108 Kharkov, Ukraine
In the present activity the ozonators with the time modulated power supplies and reactors (plate-type and
tubular) operating on the base of surface barrier discharge are investigated. The measurements of the main
specifications of the reactor at the average power level up to 50W were performed using spectroscopy diagnostic.
The relationships of the output concentration of ozone on the temperature of the reactor, frequency and power of a
source, air injection rates were obtained and discussed in detail. In addition, on the basis of the performed
experiments the geometrical parameters of reactors were optimized. Some types of reactors and power supplies
with the power up to 500W were designed. The prototypes of ozonators for medical purposes, agriculture and
household applications have been manufactured.
1. INTRODUCTION
Ozone technologies are widely applied in different
areas stimulating the further investigations of ozone
generation processes. Thus, the development of
generators alongside with power supplies of a new type
for obtaining the optimal ozone yielding rates has
become a problem of the highest importance. It is well
known that different types of discharges are applied for
ozone generation, which in its turn determine the
following construction and power characteristics of
ozonators. Our special attention has been paid to the
problem of developing the ozonators on the base of
glow barrier discharge with a pulsed power supply
operating at different frequency ranges up to the super-
high frequencies [1-3]. The efficiency of ozone
yielding rate depends on different parameters, namely:
the temperature in discharge, the geometry and shape
of electrodes, the electrode material including a
dielectric one, air flow rate, etc.
The surface barrier discharge is known to be among
the most promising methods used for ozone generation
[4]. By investigating such discharges a new and more
efficient ozonators could be designed.
In the present paper different types of reactors of
ac-current with power supply frequency from 1 to 50
kHz have been investigated. The high ozone
concentration is obtained due to micro discharges with
the duration of tens nanoseconds. The utilization of the
time-modulated power supply allows to improve the
ozone yielding rate more than 20% [5]. The
measurements of ozone concentration for different
reactors at the average power level of 50W were
performed using spectroscopy diagnostic. The
dependencies of the ozone yielding rate on different
parameters such as: the temperature, the pulse
frequency, air flow rate, applied voltage were obtained.
2. EXPERIMENT AND DIAGNOSTIC
The ozone generation process in a surface barrier
discharge in air and at atmospheric pressure with and
without time-modulated power supply was the subject
of our investigation. A schematic diagram of the
experiment is shown in Fig.1. Different types of
reactors were used for ozone generation. In reactors,
presented in Fig.2 (a, b), the air was fed through a
discharge gap without limitations of the flow rate,
whereas, in Fig.2(c) the air flow rate was limited by the
dimensions of the internal dielectric tube and a wire
mesh, which served as the internal electrode. The
reactor dimensions were varying during the experiment.
The power supplies of two types were developed.
The first one is transistored, its characteristics are
listed below:
Output voltage- 2,6-15 kV;
Converter power 1000 W;
Modulation frequency 2Hz-21 kHz;
Ton-Toff 1,05-5
Air
(a)
Air
Internal electrode External electrode
( c)
H 2 O
O 3
External electrode
Internal electrode
Dielectric barrier
( glass tube)
Air O 3
Dielectric barrier
( plate + glass)
(b)
Dielectric barrier
(glass tube)
O 3
POWER FLOW CONTROLLER
DESTRUCTOR
O 3
REACTOR
OZONE
MONITOR
AIR
Electrodes
Discharge gap Discharge gap
Fig.1. Schematic diagram of the experiment
Fig.2.(a, b ,c) Discharge reactors
145
0 2 4 6 8 10 12
0,0
0,4
0,8
1,2
1,6
2,0
2,4
2,8
3,2 3kV 4kV 5kV
6kV 7kV
T
on
ms
n
[O
3]*
10
16
ñm
-3
3,0 3,5 4,0 4,5 5,0 5,5
1
2
3
4
5
6
7
8 10 cm 20 cm 40 cm
80 cm 120 cm 160 cm
U, kV
n
[O
3]
10
16
c
m
-3
Fig3. Dependence of ozone concentration on Ton with Fig4. Dependence of [O3] concentration on applied
different applied voltage. voltage with different reactor lengths. Without
Tpulse=16ms, ,Lreactor=10cm, Q =0,8l/min, t°=const time- modulation. Q =0,8l/min
0 2 4 6 8 10 12
1
2
3
4
5
6
T
on
, ms
3kV 4kV 5kV
6kV 7kV
n
[O
3]
10
16
c
m
-3
3,0 3,5 4,0 4,5 5,0 5,5
0,5
1,0
1,5
2,0
2,5
3,0
3,5
4,0
4,5
U, kV
128 cm 192 cm
288 cm 368 cm
n
[O
3]
10
16
c
m
-3
Fig5. Dependence of ozone concentration on Ton with Fig6. Dependence of [O3] on applied voltage with
different applied voltage. different reactor lengths. Without time-modulated
Tpulse=16ms,Lreactor=368cm, Q =0,8l/min, t°=const signal and pulses. Q =0,8l/min
30 40 50 60 70
1
2
3
4
5
6
toC
n
[O
3]
10
16
c
m
-3
0 50 100 150 200 250 300
20
25
30
35
40
45
50
55
60
65
T,sec
to C
Fig.7. Dependence of ozone concentration on the Fig.8. Time dependence of the reactor temperature.
temperature of air in reactor. Without cooling. Q =0,8l/min
TABLE 1 Improvements in n [Î3] by
Time-modulation of power supply
I. F=0,8(l/min), L=10(cm) II. F=0,8(l/min), L=386(cm)
Pw System n[O3]
*1016cm-3
Pw System n[O3]
*1016cm-3
4 kW
C.W.
Time-modulated
3,6
4,5
4 kW
C.W.
Time-modulated
1,9
2,5
5 kW
C.W
Time-modulated
3,6
5
5 kW
C.W
Time-modulated
1,5
2,9
146
Variation of a power supply frequency -10-50 kHz
The second type of the power supply, being thyristor
one, was applied in a small-power ozonators:
Output voltage 3 - 8 kV;
Power 20 W;
Generator frequency 25 kHz,
Pulse duration 12 ms,
Duration leading edge 200 nsec.
The ozone concentration was determined by
chemical and spectroscopic methods. In particular, the
changing in ozone concentration was measured using
the absorption method in absorption band with
ë=253.7. A photoelectric multiplier and a
monochromator served as detectors. The error in
determining the ozone concentration was 10E+14 due
to a low-frequency drift of the photoelectric multiplier.
From the reactor outlet, the ozone was fed to a gas
cuvette, whereas the air flow rate injected through the
reactor was controlled by a gas rate-of-flow indicator.
The air temperature was controlled by the thermal
converter and mercurial thermometer.
O3 is produced in short time after the discharge –
on by the dissociation process of O2 to O. The life-
time of O (10 nsec) is much shorter than that of O3
(more than several minutes depending on the
circumstances), leading to the fact that there exists
time difference between O3 production and
decomposition. Introduction of time – modulated
power-supply with an appropriate Toff can be effective
for improving n [O3]. One can predict that the O3
production decreases with T, whereas O3 dissociation
increases, a fact which works to the disadvantage of
high Pw in the discharge space and to requirement of a
cooling system for practical uses of O3 production by
discharges. Time-modulation (on-off modulation) of
the power supply would be one possible way to reduce
Pw, to achieve n[O3] identical to the case of CW power
supply.
Dependence of ozone concentration on different
voltage applied, for reactor 10 cm in length using time-
modulation is shown in Fig.3.
Fig.4. shows the dependence of ozone
concentration on different voltage applied at a constant
frequency of a power supply with different reactor
length (10,20, 40,80, 120,160 cm)
Analyzing the represented dependencies one can
conclude that:
a). when applying the time-modulated pulse it is
possible to increase its amplitude decreasing the pulse
duration.. This lead to increase of [O3] concentration
and allows to decrease a power consumption.
Therefore, the efficiency is higher in this case. (See
Tab.1.(I)).
b). for reactor with 10cm in length and with applied
voltage of 4 and 5 kV, n[O3] is higher for time-
modulated power supply.
c). the increase in power leads to improvement of
the ozone yielding rate when applying Ton–Toff
modulation.
d). the increase of the reactor length also provides
increasing of the ozone yielding rate. Moreover, when
increasing the reactor length, the maximal ozone
concentration could be attained at lower voltage (which
is selected optimally for every reactor length). n[O3]
have a tendency to decrease with the following
increase in voltage.
One can draw an analogy when considering the
dependencies presented in Fig.5,6 Tab.1 (II).
It should be noticed that, in this case, the increase
of the reactor length took place in a parallel way unlike
the case shown in Fig. 3-4. In so doing, a sequential
increasing of the reactor length provides an essential
increase of n[O3] as compared with a parallel one. The
dependence of ozone concentration on the air
temperature in reactor and time-dependence on the
reactor temperature without application of the cooling
systems are presented in Fig.7,8 respectively. The
obtained dependencies were found to be very helpful
for the optimization of the ozone producing devices.
3. CONCLUSIONS
Experiments were performed with different
reactors applied in a surface barrier discharge using a
time-modulated power supply.
We summarize the obtained results as follows:
1. The ozone yielding rate increases more than 15%
with the use of a time-modulated power supply as
compared with conventional continuos-wave one. Ton-
Toff time, for optimal ozone outlet, is strongly
dependent on the reactor construction.
2. The optimal conditions for ozone generation
considering the reactor geometry, applied voltage,
time-modulation and the air flow rate were obtained
3. Two types of the power supplies with a power up to
1 kW were designed. Pilot models of ozonators used
for different purposes have been constructed.
References
[1] V.V. Lunin, M.P. Popovich et.al.//J. Physical
chemistry Moscow: MSU,(1998) p.480
[2] R.A. Ahmedzhanov, et.al. Investigation of the
ozone production process in nanosecond SHF-discharge in
air and oxygen //J. Tech. Phys.Vol.66,(1997),pp.9-17.
[3] V.S.Taran, O.M. Shvets, E.N. Babich. A
selection of practical application of the HF-discharge for
plasma technologies // J. Prob. of Atomic. Science and
Technology, Vol. 3(3),3(4), (1999), pp.276-279
[4] S. Masuda. et. al. Ceramic -based ozonizer //
Proc. IEEE JAS, Toronto, Canada (1985), p.1353
[5] O. Kazuyuki, et. al. Improvements of ozone
yielding rate in atmospheric pressure barrier discharge
using a time-modulated power supply // Proc.IEEE
Transaction on plasma science, Vol.(27)6, (1999),
pp.1582-1586
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