2014 Annual Meeting of The Institute of Electrostatics JapanHiroshima International University
September 7-8, 20148aB-1
September 8th (Mon.), <10:15-12:00>
Room 2

Adsorptive removal of the underwater cesium ion by acombination of zeolite and high voltage application○Yudai TAKEDA, Yuki TAINO, Takuma SUGANO, Hirofumi KURITA, Hachiro
YASUDA, Kazunori TAKASHIMA, Akira MIZUNO
Department of Environmental and life Sciences, Toyohashi University

Abstract:
137Cs is one of the most dangerous radioactive materials due to its long
half-life period of approximately 30 years. Efficient removal of the cesium ions inwater is strongly required. Here, rapid removal of cesium ions by applying pulsed
high voltage to zeolite was carried out. Since cesium ions are positively charged,
they are driven by the electric field. The result showed that when we applied thevoltage, the removal efficiency of the cesium ion increased, and total amount ofabsorbed cesium ions was also increased. Removal rate and effect of voltage
application increased with decreasing Cs+ concentration, suggesting that thismethod can be effective for low-concentration cesium chloride solution likecontaminated water from Fukushima NPP.

2014 Annual Meeting of The Institute of Electrostatics JapanHiroshima International University
September 7-8, 20148aB-2
September 8th (Mon.), <10:15-12:00>
Room 2

Influence of discharge parameters on the inception voltageof positive streamers in water◯Hidemasa Fujita*、Seiji Kanazawa**、Kiyonobu Ohtani***、Atuski Komiya***、Toshiro Kaneko*、Takehiko Sato***Graduate School of Engineering, Tohoku Univ.*, Department of Electrical &Electronic Engineering, Oita Univ.**、Institute of Fluid Science, Tohoku Univ.***

Abstract:
The influence of the applied voltage, gap distance, capacitance, andwater conductivity on the inception voltage was investigated when a single-shot
pulsed positive voltage with a duration of 10 µs was applied to a needle
electrode with a tip radius of about 40 µm in water. The experimental results
suggest the existence of threshold electric fields for both primary and secondary
streamer inceptions. However the propagation velocity of primary streamers wasconstant regardless of the field strength as well as the gap distance, capacitance,and water conductivity.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8aB-3
September 8th (Mon.), <10:15-12:00>
Room 2

Effect of Grounding Electrode Length on Corona Discharge
in Electrostatic Precipitator
Yoshihiro Kawada*, Hirotaka Shimizu*, Satoru Ooi**, Akinori Zukeran***Polytechnic University, **Kanagawa Institute of Technology

Abstract:
Electric Precipitator are used for various industries, for example, coalboiler, clean room, road tunnel, air cleaner at home, due to improvement airenvironment. Operations of Electrostatic precipitator are suspended particles arecharged with corona discharge section, charged particles are moved withelectric field and collected on collector electrode. Almost power consumption ofelectrostatic precipitator is occurred at corona discharge section. In this paper,present type electrostatic precipitator is used two-stage type, consist of
Pre-charger (corona discharge section) and Collector (electric field section). This
paper focuses on the grounding electrode length of corona discharge fromcompact and low power consumption, thus, the effect of particle charge andparticle collection efficiency with grounding electrode length are considered. We
verified the grounding electrode length by numerical methods and experimentalmethods. As results, it has been shown that suitable grounding electrode lengthof corona discharge for particle collection efficiency. Electric field strength nearwith high voltage applied wire electrode is influenced with grounding electrodelength. Thus, it is effect on corona discharge current with suitable grounding
electrode length. Penetrated particles in corona discharge are charged. Hence,collection efficiency depends on grounding electrode length of corona dischargein pre-charger.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 20148aB-4
September 8th (Mon.), <10:15-12:00>
Room 2

Electrostatic Precipitator Utilizing Gradient-force －State of Collected Particles on Pole-plates －Atsushi KATATANI*, Hiroshi HOSONO**, Hikaru MURATA**○, Hiroshi YAHATA**,and Akira MIZUNO****Panasonic Environmental Systems & Engineering Co., Ltd, **PanasonicEcology Systems Co., Ltd○, ***Toyohashi University of Technology

Abstract:lthough electrostatic precipitators (ESPs) charge particles which arepassing through corona-discharge space and collect them by Coulomb’s force,the authors have thought that the power consumption in ESPs might drasticallybe decreased if particles could be charged “without using corona-discharge”. To
verify this idea, the authors have tried an experiment as follows. i.e. DC highvoltage was applied to a one-stage ESP composed of parallel flat-plates withoutcorona discharge-spikes. This ESP does not generate corona discharge but
does form non-uniform electric field of 8 kV/cm. The ESP was operated for 18 hunder the diesel-exhaust gas-flow condition of 9 m/s. After the exposure todiesel exhaust, the electrode-plates of the ESP were observed. The result
showed that the ESP collected particles on the electrode-plates without corona
discharge. From the analysis of the vestiges on the plates, the gradient-force isworking for the particle charging. This study implies the possibility of ESPs
without using corona discharge to minimize the electrical power consumption.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8aB-5
September 8th (Mon.), <10:15-12:00>
Room 2Pilot-scale Experiment of Wet-type Exhaust Gas Treatmentfor Glass Melting Furnace Using a Plasma-chemical HybridProcess○Hashira YAMAMOTO*,**，Tomoyuki KUROKI*，Hidekatsu FUJISHIMA* andMasaaki OKUBO**Department of Mechanical Engineering, Osaka Prefecture University, **Nihon
Yamamura Glass Co., Ltd.

Abstract:
PCHP is an innovative technology for simultaneous removal of NOx (NOand NO2) and SOx (SO2 and SO3) that is demonstrated for an exhaust gas inglass melting furnaces. NO is oxidized effectively by injecting ozone with thecooling soft water and compressed air using the three-fluid spray nozzle. Theoxidized NO2 and SO2 are removed at the existing wet-type desulfurization
reactor by absorbing solution.
As a result, de-NOx and de-SOx performance are maintained stable
during 140 min experiment. The volume of exhaust gas is 6,735 m3N/h which iscooled 52°C form 150°C by spray and absorbing solution. When injected ozone
volume is 1,437 g/h, NOx concentration is reduced to 222 ppm from 301 ppm
with removal efficiency of 34% (NO is 38%) in maximum. Furthermore, SO2concentration decreased to more than 98%. It is suggested that the applicationof the PCHP to glass melting furnace with wet-type de-SOx equipment is veryeffective.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

8aB-6
September 8th (Mon.), <10:15-12:00>
Room 2Ammonia generation using discharge plasma and catalyst
Department of Environmental and Life Sciences,Kenji YAMASAKI, Takuma NAKAMURA, Hirofumi KURITA, Kazunori
TAKASHIMA, and Akira MIZUNO
Toyohashi University of Technology

Abstract:
Ammonia(NH3) generation from nitrogen and water was experimentallystudied using a simple plasma-catalyst hybrid reactor. This is intended to be analternative to urea hydrolysis used in urea-SCR deNOx system for dieselengines.A packed bed type plasma reactor was used to generate intensedischarge plasma on the catalyst pellet. Pellets of Al2O3, BaTiO3, TiO2, CeO2,and Ru supported by Al2O3 were examined as catalyst for NH3 generation.
Effect of carbon monoxide(CO) addition was examined to improve energy
efficiency.Ammonia and nitrogen oxides(NOx) were generated from N2 and H2Oby plasma-catalytic reaction while no product was observed without applicationof discharge plasma. When CO was not supplemented, CeO2 showed thehighest ammonia generation but it was smaller than that of NOx generation. With
CO addition, Ru resulted in very high NH3 generation and very low NOx
generation (nearly zero) compared with other catalysts. Maximum energy
efficiency for NH3 generation in this method was 1.1g/kWh.