This study is focused on reactive absorption of nitrogen oxides created during calcium nitrate fertilizer production. A functional mathematical process model was set up to verify the process by experimental data and to devise modifications of a real plant with this technology. Suggestions for nitrogen oxide removal efficiency improvement, including changes in operational parameters and plant layout were simulated in Aspen Plus, to achieve compliance with the European legislative emission limit of 300 ppm (mg/m3) of NOx in the off-gas released to the atmosphere. Neither of the suggested process modifications, be it an increase in column packing specific area, increase in packing height, liquid recycles cooling to ambient temperature or make-up absorbent flow rate increase led to sufficient NOx concentration decrease. Addition of a H2O2 solution into the second column was proposed to scavenge the remaining NO as it contributes mostly to the overall NOx emissions. Simulation results indicate this as a viable option to both meet the legislative criteria and to avoid liquid streams' contamination so they can be reprocessed instead of being dealt with as waste.
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References
1.
AdewuyiY.G., SakyiN.Y., and Arif KhanM. (2018). Simultaneous removal of NO and SO2 from flue gas by combined heat and Fe2+ activated aqueous persulfate solutions. Chemosphere. 193, 1216.
BavejaK.K., Subba RaoD., and SarkarM.K. (1979). Kinetics of absorption of nitric oxide in hydrogen peroxide solutions. J. Chem. Eng. Jpn. 12, 322.
4.
ChungS.J., PillaiK.C., and MoonI.S. (2009). A sustainable environmentally friendly NOx removal process using Ag (II)/Ag (I)-mediated electrochemical oxidation. Sep. Purif. Technol. 65, 156.
5.
De PaivaJ.L., and KachanG.C. (1998). Modelling and simulation of a packed column for NOx absorption with hydrogen peroxide. Ind. Eng. Chem. Res. 37, 609.
6.
DeshwalB.R., and KunduN. (2018). Comparing acidic sodium hypochlorite and sodium chlorite solutions for controlling nitrogen oxides emissions. Environ. Eng. Sci. 35, 430.
7.
DeshwalB.R., LeeS.H., JungJ.H., ShonB.H., and LeeH.K. (2008). Study on the removal of NOx from simulated flue gas using acidic NaClO2 solution. J. Environ. Sci. (Beijing, China), 20, 33.
8.
FineN.A., and RochelleG.T. (2014). Absorption of nitrogen oxides in aqueous amines. Energy Procedia. 63, 830.
9.
GhrissO., AmorH.B., JedayM.-R., and ThomasD. (2019). Nitrogen oxides absorption into aqueous nitric acid solutions containing hydrogen peroxide tested using a cables-bundle contactor. Atmos. Pollut. Res. 10, 180.
10.
HüpenB., and KenigE.Y. (2005). Rigorous modelling of NOx absorption in tray and packed columns. Chem. Eng. Sci. 60, 6462.
LaueW., ThiemannM., ScheiblerE., and WiegandK.W. (2002). Nitrates and Nitrites. Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH.
13.
LiD., XiaoZ., Bin AftabT., and XuS. (2018). Flue gas denitration by wet oxidation absorption methods: Current status and development. Environ. Eng. Sci. 35, 1151.
14.
LiémansI., and ThomasD. (2010). Effect of nitric and sulfuric acids on NOx and SOx absorption into oxido-acidic solution. In: Distillation and Absorption 2010 Conference proceedings, 12–15 September 2010, Eindhoven, the Netherlands, 325.
15.
LiuY., ZhangJ., Sheng, Ch., ZhangY., and ZhaoL. (2010). Simultaneous removal of NO and SO2 from coal-fired flue gas by UV/H2O2 advanced oxidation process. Chem. Eng. J. (Amsterdam, Neth.), 162, 1006.
16.
MondalM.K., and ChelluboyanaV.R. (2013). New experimental results of combined SO2 and NO removal from simulated gas stream by NaClO as low-cost absorbent. Chem. Eng. J. (Amsterdam, Neth.), 217, 48.
17.
RamanandS.B., and Phaneswara RaoD. (1996). Modelling and simulation of NOx absorption into water in a countercurrent flow packed column. Comput. Chem. Eng. 20, 1059.
18.
SkalskaK., MillerJ.S., and LedakowiczS. (2012). Intensification of NOx absorption process by means of ozone injection into exhaust gas stream. Chem. Eng. Process. 61, 69.
19.
Slovak Law Nr. 137/2010 on Atmosphere Protection. (2012). Available at: www.zakonypreludi.sk/zz/2010-137 (in Slovak) (accessed April2, 2018).
20.
Slovak Regulation Nr. 410/2012 Setting the Procedures and Details of the Law Nr. 201/2012 Execution. (2012). Available at: www.epi.sk/zz/2012-410#f3908082 (in Slovak) (accessed April2, 2018).
21.
SuchakN.J., JethaniK.R., and JoshiJ.B. (1991). Modelling and simulation of NOx absorption in pilot-scale packed columns. AIChE J. 37, 323.
22.
United States Environmental Protection Agency. (1999). Nitrogen Oxides (NOx), Why and How They Are Controlled, Technical Bulletin. Available at: https://www3.epa.gov/ttncatc1/dir1/fnoxdoc.pdf (accessed October6, 2017).
23.
VaidyaP.D., and KenigE.Y. (2007). Gas-liquid reaction kinetics: A review of determination methods. Chem. Eng. Commun. 194, 1543.
24.
WangZ., WangZ., YeY., ChenN., and LiH. (2016). Study on the removal of nitric oxide (NO) by dual oxidant (H2O2/S2O82-) system. Chem. Eng. Sci. 146, 133.
25.
WangZ., ZhangY., TanZ., and LiQ. (2018). A wet process for oxidation-absorption of nitric oxide by persulfate/calcium peroxide. Chem. Eng. J. (Amsterdam, Neth.), 350, 767.
26.
WiegandK.W., ScheiblerE., and ThiemannM. (1990). Computation of plate columns for NOx absorption by a new stage-to-stage method.Chem. Eng. Technol.13, 289.
27.
XuY.Y., ZhangY., WangJ., and YuanJ.Q. (2013). Application of CFD in the optimal design of a SCR-DeNOx system for a 300 MW coal-fired power plant. Comput. Chem. Eng. 49, 50.
28.
YanJ., ZhouF., ZhouY., WuX., ZhuQ., LiuH., and LuH. (2018). Wet oxidation and absorption procedure for NOx removal. Environ. Technol. Innov. 11, 41.
29.
YangS., PanX., HanZ., ZhaoD., LiuB., and ZhengD. (2018). Removal of NOx and SO2 from simulated ship emissions using wet scrubbing based on seawater electrolysis technology. Chem. Eng. J. (Amsterdam, Neth.), 331, 8.
30.
Yildirim, Ö., KissA.A., HüserN., LessmanK., and KenigE.Y. (2012). Reactive absorption in chemical process industry: A review on current activities. Chem. Eng. J. (Amsterdam, Neth.), 213, 371.
31.
ZhaoY., HaoR., XueF., and FengY. (2017). Simultaneous removal of multi-pollutants from flue gas by a vaporized composite absorbent. J. Hazard. Mater. 321, 500.
32.
ZhengC., XuC., ZhangY., ZhangJ., GaoX., LuoZ., and CenK. (2014). Nitrogen oxide absorption and nitrite/nitrate formation in limestone slurry for WFGD system. Appl. Energy. 129, 187.
