Simultaneous Removal of SO₂ and NO by O₃ Oxidation Combined with Wet Absorption

Abstract

The effects of ozone concentration, NaOH concentration, type and concentration of additives, initial pH, temperature, and NO and SO 2 concentration on simultaneous removal of NO and SO 2 were studied through ozone oxidation combined with wet absorption. Results indicated that ozone concentration and the type and concentration of additives had the most significant effect on NO removal. The optimal ozone concentration was 250 ppm (NO/NO 2 = 1), and the best additive was KMnO 4 . The removal efficiency of NO x was as high as 97.86% when NO/NO 2 = 1, and the concentration of KMnO 4 was 0.025 mol/L. Considering economic and other factors, the KMnO 4 concentration was selected to be 0.006 mol/ L. At this time, the removal efficiencies of NO x and SO 2 were 81.35 and 100%, respectively. This method has potential application prospects for simultaneous removal of SO 2 and NO in the industrial flue gas.

Preliminary study on direct measurements and diagnostics for chemical reaction dynamics of NOx by using laser wavelength modulation spectroscopy

“…Nitrogen oxides (NO x ) emitted during the combustion of fossil fuels are the main cause of photochemical smog and acid rain [1] . To reduce the impact of NO x on the environment and human health, the oxidation of NO x to the highly soluble N 2 O 5 by ozone (O 3 ) injection and then removal by wet process is an effective DeNO x technology [2] . Therefore, detailed measurements of molecular concentration, reaction temperature, and pressure changes during the reaction of NO x oxidation by O 3 injection can help to understand more deeply the chemical kinetics of this reaction process, provide data reference for the reaction process, and supply support to the cognition of the reaction mechanism and the optimization of the reaction conditions.…”

Study on NO Removal Characteristics of the Fe(II)EDTA and Fe(II)PBTCA Composite System

“…NO X is one of the major air pollutants produced by burning fossil fuels. , It will cause certain harm to the ecological environment, such as acid rain, photochemical smog, global warming, and ozone layer destruction. − About 90–95% of NO X in a typical flue stream is NO, which is almost insoluble in water. Currently, selective catalytic reduction (SCR) denitration technology, which is relatively mature in the industry, can effectively remove NO in flue gas. − However, SCR has some problems, such as high operating cost, − catalyst poisoning, , high reaction temperature, , and ammonia escape. , …”

“…8−13 However, SCR has some problems, such as high operating cost, 14−16 catalyst poisoning, 17,18 high reaction temperature, 19,20 and ammonia escape. 21,22 Fe 2+ complexation wet denitrification technology is an effective technology for NO removal. Fe 2+ in solution can quickly capture NO to form a ferrous nitrite complex so as to achieve the purpose of efficient NO removal.…”

Follow-up Research on Simultaneous Removal of NO and SO2 by Wet Scrubbing NaClO Solution Combined In Situ with Ozone Oxidation: Performance and Mechanism

“…Results showed that when half of NO in flue gas was pre-oxidized to NO 2 by O 3 , KMnO 4 solution exhibited the best denitration performance. When KMnO 4 concentration was 6 mM, NO x and SO 2 removal efficiencies were 81% and 100%, respectively . Liu et al investigated NO pre-oxidation by O 3 and subsequent NO x removal by wet scrubbing NH 3 /(NH 4 ) 2 S 2 O 8 composite solution, in which a NO x conversion efficiency of 92.6% had been reached .…”