Kensuke Akutsu

A ceramic-based ozonizer using high-frequency discharge

A thin ceramic layer, either cylindrical or planar in form, is sandwiched by a number of parallel strip-like discharge electrodes and a film-like induction electrode. An AC exciting voltage of frequency 10 kHz and 10 kV peak-to-peak (p-p) is applied between the electrodes to produce a stable high-frequency surface glow discharge for generation of ozone. As a result of its high frequency, low exciting voltage, and small size, a great reduction in cost is achieved in both the ozonizer and its power supply. The presented ozonizer can easily produce a very high ozone concentration (5000-15000 volume p.p.m. for air; 50-100000 volume p.p.m. for oxygen) without using a special enrichment means. Its power efficiency can be made very high (170 gO/kWh for air) by proper selection of operating parameters. >

Enhancement of electron beam denitrization process by means of electric field

Abstract A novel way of denitrization and desulphurization of flue gas, “Electron Beam Method”, consist of two stage processes. The first one is a radiochemical process in which NO x and SO x are rapidly converted into solid aerosol particles by the irradiation of a high energy electron beam. NH 3 is added to the gas in this process. The second one is a collection process of these converted particles, which performed in an electrostatic precipitator located downstream. The authors discovered that this electrostatic precipitation can be made inside the irradiation chamber itself by applying a d.c. electric field. A further investigation revealed that the radiochemical process of denitrization is enhanced by application of the electric field. The electric field accelerated greatly the reaction rate once it exceeded 2.2 kV/cm, and the increment of the reaction rate became proportional to the 5th power of the increment of the field strength. This leads to an expectation that the high initial and running costs of the electron beam source—the major obstacles against the electron beam method in spite of its many advantages—may be greatly reduced by the use of electric field.

Surface treatment of plastic material by pulse corona induced plasma chemical process-PPCP

A novel plasma chemical process PPCP (pulse corona induced plasma chemical process) can produce copious active radicals in air under NTP by using an extremely fast-rising narrow pulse high voltage between corona electrodes and grounded counter electrodes so that the intense streamer coronas are generated. this provides an effective means of surface treatment to a plastic material placed between the two electrodes through generating free bonds in its surface directed to the corona electrodes. Special features of this method are that it can cope with a complex shape of the material to be treated, and that it does not turn into a spark even at its perifery near the grounded counter electrode.<<ETX>>