Simultaneous removal of NO/sub x/ and SO/sub x/ in flue gas emission using plasma-chemical hybrid process

Abstract

Abstrd-In the previous studies, we confirmed that the plasmachemical combined hybrid process for controlling NOx flue gas emission was extremely effective and economical in comparison with the conventional selective catalytic reduction (SCR) system and other technologies. In the present study, we carried out the experiments on the simultaneous removal of Non and SOX at elevated temperature using the plasma-chemical hybrid process. A series of experiments were performed to quanti& all the reaction byproducts such as N20, CO, HNOz, HNoj NO; and SO; to evaluate the simultaneous NOS and SOX removal efficiency. The oxidation from NO to N& without decreasing NOx concentration (i.e., mini" reaction byproducts) and with least power consumption is the key for the optimum reactor operating condition. The produced NOz was totally converted to N2 and Na2S04 with NazSOs or NazS with and without NaOH using the barrier-type packed-bed plasma reactor followed by the packed column chemical reactor. The N Q reduction was more effective for Na2S than NazS03 and at least 5 times of stoichiometric amount of chemicals are required for complete N@ reduction. The hybrid process showed nearly 100% NOx and SOX simultanems removal was achieved with less than 5 ppm of NzO and CO, and the operating cost was less than 1/10 of the SCR process. The additional Sa treatment system can be eliminated.

Collection of submicron particles by an electrostatic precipitator using a dielectric barrier discharge

“…Removal of SO 2 from simulated gas streams was experimentally investigated using the DBD, and also studied by computer modeling (Chang, Balbach, Rood, & Kushner, 1991). Simultaneous removal of SO 2 and NO by use of the DBD was reported by Dhali and Sardja (1991), Sun, Pashaie, Dhali, and Honea (1996), and Yamamoto, Okubo, Nagaoka, and Hayakawa (2000). Higashi, Uchida, Suzuki, and Fujii (1992) investigated the simultaneous reduction of NO x , SO x , and soot.…”

Lab-scale test of a ventilation system including a dielectric barrier discharger and UV-photocatalyst filters for simultaneous removal of gaseous and particulate contaminants

“…(2004), who used plasma chemical reactions in the DBD. Simultaneous removal of SO 2 and NO by use of the DBD was reported by Yamamoto et al. (2000).…”