title: Novel electrostatic precipitator using unipolar soft X-ray charger for removing fine particles: Application to a dry de-NOX process.
abstract: The novel electrostatic precipitator (ESP), consisting of a soft X-ray charger and a collection part, was demonstrated and applied to a dry de-NOX process to evaluate its performance in by-product particle removal. NOX gas was oxidized by ozone (O3) and neutralized by ammonia (NH3) sequentially, and finally converted to an ammonium nitrate (NH4NO3) aerosol with ∼ 100-nm peak particle diameter. The unipolar soft X-ray charger was introduced for charging the by-product particles in this dry de-NOX process. For the highest particle collection efficiency, the optimal operating conditions of the soft X-ray charger and collection part were investigated by adjusting the applied voltage of each device. The results showed that ∼ 99% of NOX was removed when the O3/NOX ratio was increased to 2 (i.e., the maximum production conditions of the NH4NO3 by-product particles by the gas-to-particle conversion process). The highest removal efficiency of particle (∼ 90%) was observed with operating conditions of positive polarity and an applied voltage of ∼ 2-3 kV in the charger chamber. The unipolar soft X-ray charger has potential for particle removal systems in industrial settings because of its compact size, ease of operation, and non-interruptive charging mechanism.
authors.affiliation: Center For Environment, Health, and Welfare Research, Korea Institute of Science and Technology (KIST), Hwarangno 14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea; Aerosol & Particle Technology Laboratory, Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 305-701, Republic of Korea.
authors.forename: Jeongan
authors.initials: J
authors.lastname: Choi
authors.affiliation: Environment and Energy Systems Research Division, Korea Institute of Machinery and Materials, 104 Sinseongno, Yuseong-gu, Daejeon 305-343, Republic of Korea.
authors.forename: Hak Joon
authors.initials: HJ
authors.lastname: Kim
authors.affiliation: Environment and Energy Systems Research Division, Korea Institute of Machinery and Materials, 104 Sinseongno, Yuseong-gu, Daejeon 305-343, Republic of Korea.
authors.forename: Yong Jin
authors.initials: YJ
authors.lastname: Kim
authors.affiliation: Aerosol & Particle Technology Laboratory, Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 305-701, Republic of Korea. Electronic address: sskim@kaist.ac.kr.
authors.forename: Sang Soo
authors.initials: SS
authors.lastname: Kim
authors.affiliation: Center For Environment, Health, and Welfare Research, Korea Institute of Science and Technology (KIST), Hwarangno 14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea. Electronic address: jaehee@kist.re.kr.
authors.forename: Jae Hee
authors.initials: JH
authors.lastname: Jung
keywords: Ammonium nitrate; Electrostatic precipitator; Exhaust gas; Ozone; Photoelectric charging; de-NO(X)