Simultaneous Removal of SO2 and NO from Flue Gas Using Ozone

2013 ◽  
Vol 838-841 ◽  
pp. 2721-2725
Author(s):  
Xu Jie Lu
Keyword(s):  
Removal Efficiency ◽  
Flue Gas ◽  
Experimental Results ◽  
Molar Ratio ◽  
Simultaneous Removal ◽  
Distilled Water ◽  
No Removal ◽  
Operating Condition ◽  
Removal Efficiencies

The objective of this work was to study the effect of some operating condition on the simultaneous removal of NO and SO2from simulated flue gas in the lab-scale agitated bubbling reactor. The experimental results showed that NO removal efficiency increased with the increase in the molar ratio of O3/NO, while removal efficiency of SO2decreased. When absorption liquid changed from distilled water to Na2CO3solution, it is observed that removal efficiencies of NO and SO2increase with the increase in the concentration of Na2CO3solution. At 0.08 mol/L of Na2CO3solution, the removal efficiencies of SO2and NO are 100% and 93%, respectively

Application of Ozone in the Treatment of Nitric Oxide from Simulated Flue Gas

2013 ◽  
Vol 838-841 ◽  
pp. 2663-2666
Author(s):  
Xu Jie Lu
Keyword(s):  
Nitric Oxide ◽  
Removal Efficiency ◽  
Reaction Temperature ◽  
Flue Gas ◽  
Experimental Results ◽  
Molar Ratio ◽  
No Removal ◽  
Operating Condition ◽  
Molar Ratios

The objective of this work was to study the effect of some operating condition on the removal of NO from simulated flue gas in the lab-scale agitated bubbling reactor. The experimental results showed that NO removal efficiency went up with the increase in the molar ratios of O3/NO and the NO removal efficiency reached 92% at 3 of molar ratio. It can also be found that the average removal efficiency was slightly affected by the reaction temperature and almost retained over 75%.

Study on the Experiments of Flue Gas Denitrification and Desulfurization Using Nitric Acid Solution

2008 ◽  
Author(s):  
Bao-Ming Sun ◽  
Shui-E Yin ◽  
Zhong-Li Wang
Keyword(s):  
Nitric Acid ◽  
Oxygen Concentration ◽  
Removal Efficiency ◽  
Flue Gas ◽  
Nitric Acid Concentration ◽  
Nox Removal ◽  
No Removal ◽  
Nox Removal Efficiency ◽  
The Individual ◽  
So2 Concentration

The present study attempts to take nitric acid as absorbent to clean up SO2 and NO gases simultaneously from the simulated flue gas in the lab-scale bubbling reactor, this study was divide into the individual DeNOx experiments and the combined DeSOx/DeNOx experiments: the individual DeNOx experiments were carried out to examine the effect of various operating parameters such as input NO concentration, nitric acid concentration, oxygen concentration input SO2 concentration, adding KMnO4 as additive and taking NaOH as the secondary absorption processes on the SO2 and NOx removal efficiencies at room temperature, the results of the individual DeNOx show that NO removal efficiency of 70%–95% were achieved under optimized conditions. NO removal efficiency increased with the increasing nitric acid concentration and increased by adding KMnO4 into the absorbent as additive as well. The removal efficiency of NO can reach 95% when using the two-step integrated processes of (HNO3+KMnO4)-NaOH, the absorption solution of 50% nitric acid, 400ppm of input NO concentration. 0.5% oxygen concentration and without SO2 in the simulated flue gas. No improvement on the NOx removal efficiency was observed with the increasing of KMnO4 and NaOH concentration in the scrubbing solution. The results of the combined DeSOx/DeNOx experiments show that the maximum DeNOx and DeSOx efficiencies ranged from 36.6% to 81% and from 99.4% to 100.0%, respectively. The prime parameters affecting the NOx removal efficiency are the oxygen concentration and the input SO2 concentration.

A Novel Method on Simultaneous Removal of SO2, NO and Hg0 from Simulated Flue Gas

2013 ◽  
Vol 316-317 ◽  
pp. 214-218 ◽  
Author(s):  
Yi Zhao ◽  
Fang Ming Xue ◽  
Yuan Shao
Keyword(s):  
Reaction Temperature ◽  
Flue Gas ◽  
Solution Concentration ◽  
Simultaneous Removal ◽  
Solution Ph ◽  
Experimental Conditions ◽  
Wet Process ◽  
Temperature Solution ◽  
Novel Method ◽  
Removal Efficiencies

A novel wet process has been developed to simultaneously remove NO, SO2 and Hg0 from flue gas. According to the conditions of the bubbling reactor, diperiodatocuprate (Ⅲ) coordination ion solution was prepared with CuSO4•5H2O, KIO4, K2S2O8, and KOH, and the effects of the various influencing factors, such as diperiodatocuprate (Ⅲ) coordination ion solution concentration, reaction temperature, solution pH on removal efficiencies were investigated. The removal efficiencies of 98% for SO2, 90% for Hg0 and 56.8% for NO were obtained, respectively, under the optimal experimental conditions, in which diperiodatocuprate (Ⅲ) coordination ion solution concentration was 6 mmol /L, the reaction temperature was 323 K, and the solution pH was 9.0. That [Cu(OH)2(H3IO6)]- was the main existing form of the absorbent at the optimal experimental conditions was confirmed by calculating the concentration ratios of IO4- and its dissociation products / [IO4-]ex under different pH, and thereby simultaneous removal mechanism for SO2, NO and Hg0 was proposed.

The Characteristics of NO Reduction in the Reactor With Dielectric Barrier Discharge

2009 ◽  
Author(s):  
Bao-Ming Sun ◽  
Shui-E Yin
Keyword(s):  
Dielectric Barrier Discharge ◽  
Oxygen Content ◽  
Removal Efficiency ◽  
Barrier Discharge ◽  
Nitrogen Atmosphere ◽  
Discharge Power ◽  
Gas Velocity ◽  
Dielectric Barrier ◽  
No Removal ◽  
Removal Efficiencies

The conventional techniques, which are being used to clean the flue gases such as catalytic reduction method for NO removal, wet and dry scrubbers for SO2 removal and ESP for particulate removal, are becoming more expensive and less suitable for small plants and mobile emission sources. Non-thermal plasma (NTP) techniques utilizing electrical discharges give an innovative approach for economical solution of gas cleaning. The studies present recent work on applying the electrical discharge plasma technology for treating gaseous pollutants, in general, and nitric oxide, in particular, as this is one of the major contributors to air pollution. The present works focuses attention on dielectric barrier discharge technique for nitric oxide removal from simulated gas compositions and investigate the effect of various operating parameters on the NO removal efficiencies at room temperature. The effects of various parameters, viz. discharge power, gas velocity, initial NO concentration (ppm), gas mixture composition, etc., on NO removal efficiency are discussed. Studies are divided into two parts: in the nitrogen atmosphere and argon atmosphere respectively, in order to investigate the effect of various operating parameters on the NO removal efficiencies at room temperature. The results in nitrogen atmosphere indicate that the influence of the discharge power, oxygen content and different initial concentration on NO removal efficiency are also studied. Conclusion that increasing discharge power is in favor of the NO removal. Adding oxygen reduce the NO removal efficiency significantly, and changing the NO initial concentration effected on NO removal efficiency but nor as good as the factors of discharge power, oxygen content. In the argon atmosphere, the dielectric barrier discharge require lower voltage level. The effect of the discharge power, gas velocity and oxygen content on NO removal efficiencies are studied and some conclusions be obtained, increasing discharge power and lowing flue gas velocity would conducive to removal, adding oxygen would hinder the removal of NO. Further result and comparative study of various cases be presented in this paper.

Study on Wastewater Pollutant Removal Efficiencies of Artificial Aquatic Plants with Different Lengths

2013 ◽  
Vol 448-453 ◽  
pp. 638-641
Author(s):  
Wen Guo Dong ◽  
Qing Feng Chen ◽  
Ming Sheng Miao ◽  
Hong Yan Yang
Keyword(s):  
Removal Efficiency ◽  
Total Phosphorus ◽  
Aquatic Plants ◽  
Pollutant Removal ◽  
Experimental Results ◽  
Removal Efficiencies

Five different lengths artificial aquatic plants were used to purify wastewater. The artificial aquatic strings of 10cm diameter cylinder were divided into five groups, such as 0cm (A, CK), 50cm (B),100cm (C),150cm (D) and 200cm (E), respectively. The experimental results showed that the best removal efficiency was 78.3% and 73.5% for COD and ammonina nitrogen in the C group, and for the total phosphorus (TP), the best removal efficiency was 61.3% in the B group. Therefore, it is suggested that the best length is 100cm at 22°C to 26°C in the water according to the comprehensive removal efficiency.

Effects of influent COD/N ratio and internal recycle ratio on nitrogen removal efficiency in the KNR process

2006 ◽  
Vol 53 (9) ◽  
pp. 265-270 ◽  
Author(s):  
C.W. Suh ◽  
S.H. Lee ◽  
H.S. Jeong ◽  
J.C. Kwon ◽  
H.S. Shin
Keyword(s):  
Carbon Source ◽  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Denitrification Rate ◽  
Optimal Operating ◽  
Operating Condition ◽  
Optimal Operating Condition ◽  
External Carbon Source ◽  
Recycle Ratio ◽  
Removal Efficiencies

In this study, with the KNR® process that has many advantages, the nitrogen removal efficiency of KNR was experimentally investigated at various COD/N ratios of influent conditions. The optimal operating condition of internal recycle ratio was evaluated. The TN removal efficiencies were 59.1, 72.5 and 75.9% at the COD/N ratios of 3, 5 and 7, respectively. These high removal efficiencies resulted from high denitrification rate in UMBR with high microorganism concentration. Furthermore, specific endogenous denitrification at MLVSS of 10.3 g/L that is similar to MLVSS in UMBR was over two times higher than that at MLVSS of 2.06 g/L. This result suggests that endogenous denitrification rate in UMBR is so high that the requirement of an external carbon source can be saved. As the internal recycle ratio increased from 100 to 400%, the TN removal efficiency also improved from 69.5 to 82.9%, and the optimal internal recycle ratio was 300%.

New Experimental Results of NO Removal from Simulated Flue Gas by Wet Scrubbing Using NaClO Solution

2017 ◽  
Vol 31 (3) ◽  
pp. 3047-3054 ◽  
Author(s):  
Zhitao Han ◽  
Shaolong Yang ◽  
Xinxiang Pan ◽  
Dongsheng Zhao ◽  
Jingqi Yu ◽  
...  
Keyword(s):  
Flue Gas ◽  
Experimental Results ◽  
No Removal ◽  
Wet Scrubbing

scholarly journals Simultaneous Removal of NO, SO2 and Hg0 with the WDRMRS

2021 ◽  
Author(s):  
Mingqiang Deng ◽  
Zhengguo Xiao ◽  
Dengxin Li ◽  
Qiaoling Zhu ◽  
Qin Chen ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Flue Gas ◽  
Critical Role ◽  
Urea Solution ◽  
Simultaneous Removal ◽  
Solution Ph ◽  
System A ◽  
Liquid Dispersion ◽  
Initial Ph ◽  
Pollutants Removal

Abstract Micro-nanobubbles can spontaneously generate hydroxyl free radicals (*OH). Urea is a cheap reductant and can react with NOx species, and their products are nontoxic and harmless N2, CO2 and H2O. In this study, a Wet Direct Recycling Micro-nanobubble Flue Gas Multi-pollutants Removal System (WDRMRS) was developed for the simultaneous removal of NO, SO2 and Hg0. In this system, a micro-nanobubble generator (MNBG) was used to produce a micro-nanobubble gas-liquid dispersion system (MNBGLS) through recycling the urea solution from the reactor and the simulated flue gas composed of N2, NO, SO2 and Hg0. The MNBGLS, which has a large gas-liquid dispersion interface, was recycled continuously from the MNBG to the reactor, thus achieving cyclic absorption of various pollutants. All of the investigated parameters, including the initial pH and temperature of the absorbent as well as the concentrations of urea, NO and SO2 had significant effects on the NO removal efficiency but did not significantly affect the SO2 removal efficiency, whereas only the initial solution pH and NO concentration affected the Hg0 removal efficiency. The analysis results of the reaction mechanism showed that played a critical role in the removal of various pollutants. After the treatment by this system, the main removal products were HgO sediment, and which could be easily recycled.

Experimental investigation of nitric oxide removal from flue gas using hexamminecobalt(II) solution scrubbing in a pilot-scale facility

2018 ◽  
Vol 36 (6) ◽  
pp. 505-512 ◽  
Author(s):  
Bing Han ◽  
Qinghai Li ◽  
Zhen Liu ◽  
Zhongchao Tan ◽  
Yanguo Zhang
Keyword(s):  
Nitric Oxide ◽  
Experimental Investigation ◽  
Removal Efficiency ◽  
Reaction Temperature ◽  
Ph Value ◽  
Pilot Scale ◽  
Optimal Operation ◽  
Experimental Results ◽  
No Removal ◽  
Operation Conditions

An experimental investigation of operational parameters, including liquid/gas ratio (L/G), inlet nitric oxide (NO) concentration, reaction temperature, and pH value of absorbing agent, on NO removal efficiency with hexamminecobalt(II) solution scrubbing was conducted on a pilot-scale facility to search optimal operation conditions. The experimental results show that NO removal efficiency increased with the pH value of hexamminecobalt solution, while the improving rate dropped gradually. When the reaction temperature increased, the NO removal efficiency increased first and then decreased. At the same time, NO removal efficiency increased with the increasing of L/G and hexamminecobalt concentration, while the removal efficiency did not change much at low NO concentration. The pH of 10.4 and L/G of 16 L/m3 were close to the optimal operation conditions, and the scrubbing temperature fell within a reasonable operation temperature. The experimental results can be used as a reference for the design and operation of scaled-up industrial devices.

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