|ICESP X CONFERENCE PAPER ABSTRACTS 2C SERIES
Held in Cairns,
Conference on Electrostatic Precipitation (ICESP)
is the official conference of the International Society for Electrostatic
TOSHIAKI YAMAMOTO, HIDEKATSU FUJISHIMA, MASAAKI OKUBO AND TOMOYUKI KUROKI
The pilot-scale NOx and
SOx simultaneous removal from boiler emission was performed using
radical injection and chemical hybrid process. The radical injection
is often called as indirect plasma (or remote plasma) and air
radicals are produced at room temperature with less than 1/10 of the
flue gas flow rate. The flue gas from the boiler was in the range of
450~1,470 Nm3/hr, the gas temperature of 280oC, and NOx
concentration of 30 ppm for city gas, and 70 ppm of NOx and 35 ppm
of SOx for heavy oil, respectively. The radical injection was
demonstrated to be extremely effective for NO oxidation especially
when the flue gas temperature is in the range of 300oC where NOx is
rather generated at this temperature range. The produced NO2 was
further reduced to N2, and nontoxic and water soluble Na2SO4 by
Na2SO3 solution in the chemical scrubber. For the case of oil firing
boiler SO2 was simultaneously adsorbed by NaOH solution. The NOx
removal efficiency for gas firing exceeds 90% but NOx removal
efficiency for oil firing was in the range of 60% due to the lack of
radicals and ozone concentration with the pulse power supply used.
The removal efficiency of SO2 was in the range of 85~90%. The NOx
removal efficiency was evaluated by the ratio of the radical flow
rate by the indirect plasma to the primary flue gas flow rate,
specific energy density, and Na2SO3 concentration and chemical flow
rate. Scrubbing solution was chemically analyzed and it is confirmed
that the waste solution can be disposed outside of the plant.
SERGEI F. BURLATSKY, ERIC J. GOTTUNG, LUCA BERTUCCIOLI, BRUCE H. EASOM, LEO SMOLENSKY, MARK S. BERRY, RALPH F. ALTMAN3, VADIM V. ATRAZHEV4 AND DMITRII V. IVONIN
United Technologies Corporation is developing the ElectroCore technology for multipollutantcontrol on coal fired power plants and other applications. This development combines physics-based modeling with pilot testing and has been carried out in conjunction with Southern Company, Alabama Power and EPRI. Two independent physics-based models for the ElectroCore precharger and separator were developed at the United Technologies Research Center (UTRC) in collaboration with the Russian Academy of Sciences. The precharger model calculates the electrical charge on a particle passing through the precharger and the separator model calculates mass separation efficiency. The modeling has successfully predicted pilot separation efficiency trends and the 98–99% particulate separation efficiency achieved in the latest pilot tests. UTC plans to continue the ElectroCore technology development through continued modeling and pilot testing, a full scale, industrial demonstration project and the investigation of alternate applications in coal gasification, industrial processes and indoor air quality.
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T SAKAMAKI, H MURATA AND S KOGOSHI
Two kinds of experiments for NOx removal have been carried out. One is the experiment using dielectric barrier discharge (DBD) with the aid of adding urea solution. The other is the experiment with plasma treated TiO2 photo catalyst. For adding urea solution the energy efficiency of NOx removal by DBD is better than without the adding by more than 10 times at Vac ~7.2kV. The adding water only also shows good result. So the improvement in NOx removal by DBD with urea solution is not only due to urea but also water. TiO2 films are developed on the one side of a quartz tube at 500oC by use of the sol-gel method. Then the TiO2 films have been processed in hydrogen or nitrogen plasma. The difference of NOx removal rate between the plasma treated films and no treated films has been measured, in which measurements a chemical lamp, black light and fluorescent lamp were used. The results show that the hydrogen plasma treated film is the most efficient as photo catalyst for NOx removal.
Last updated: May 10, 2009.
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