Simultaneous removal of NOx, SO2 and Hg in nitrogen flow in a narrow reactor by ozone injection: Experimental results

Simultaneous removal of SO2, NO and Hg0 by wet scrubbing using urea + KMnO4 solution

“…Currently, SO 2 pollution problem has been effectively controlled with wet limestone-gypsum process as the main desulphurization technology [2]. In order to control NO X , combustion modification technologies, selective non-catalytic reduction (SNCR) method and even choosing low content of nitrogen coals have been widely used [5]. Meanwhile, selective catalytic reduction (SCR) technology has been introduced from abroad.…”

“…For mercury control, activated carbon injection upstream of the ESP or FF is considered as the most promised as a mercury control technology [8,9], whereas, the rather high cost of the sorbent, activated carbon's poor utilization/selectivity for mercury have made this technology less attractive for industrial use in China [10,11]. Since the single-pollutant control technologies result in expensive investment and operating cost, researchers focused on developing new technology for simultaneous removal of NO, SO 2 and mercury from flue gas, including ozone injection [5], pulsed corona discharge, [6] absorption process [12][13][14] etc. Now, multi-pollutant gas cleaning systems are considered a valuable option in terms of efficiency and low investment, and the wet flue gas desulfurization (WFGD) units are considered an optimized method for the co-capture of pollutants [15].…”

“…So, most of the researchers have focused on the oxidation technology, and wish to efficiently remove Hg 0 , SO 2 and NO simultaneously in the WFGD. The most commonly used oxidants include K 2 S 2 O 8 [17], KMnO 4 [18,19], Fenton's reagent [20,21], NaClO 2 [12,22], O 3 [5], H 2 O 2 [23,24], ClO 2 [25] and so on.…”

Improving the Removal Efficiency of Elemental Mercury by Pre-Existing Aerosol Particles in Double Dielectric Barrier Discharge Treatments

“…Many technologies have been developed for mercury control (Biswas et al, 1999), such as injecting powdered activated carbon to adsorb mercury (Sjostrom et al, 2010;Clack, 2012), injecting halogen reagents (Zhao et al, 2006) and using UV light and ozone to realize mercury oxidization (Wu et al, 1998;Granite and Pennline 2002;Lee et al, 2004;McLarnon et al, 2005;Wang et al, 2007;Yang et al, 2012). Non-thermal plasma operated at atmospheric pressure is one of the promising technologies for converting gaseous elemental mercury (Hg 0 ) to oxidized mercury (Hg 2+ ) and particulate bound mercury (Hg p ) (Chen et al, 2006;Byun et al, 2011a), which can then be effectively removed by conventional air-pollution control devices (Clack, 2006).…”

The effect of ozone feeding mode on the effectiveness of NO oxidation

“…Also, metallic mercury Hg 0 after oxidation could be efficiently scrubbed in alkaline solutions (Vosteen et al, 2006). Particularly limestone-based wet scrubbers commonly used for the control of SO 2 emissions can be successfully adopted for control of NO x and Hg emissions by the retention of their oxidized forms (Wang et al, 2007).…”