Abstract
The current research is aimed at experimentally finding out characteristic parameters of the operation of the fog unit and their effect on the efficiency of particulate matter capture. To conduct the experiment, a laboratory equipment—fog unit—was designed and prepared. The fog unit is suitable for 10, 20 and 30 kW pellet boilers. The impact of the parameters on essential changes of indicators important for PM capture is described: sprayed water and gas contact surface; droplets and gas contact time in the unit; droplets holdup in the unit. In the process, a regression equation for predicting the effectiveness of PM capture in a direct contact fog unit is obtained. A good experimental and calculated data correlation is observed (adjusted R squared statistics is 85.32%).
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Abbreviations
- ω1, ω2 :
-
Inlet and outlet moisture content, kg/kg dry gas
- C p1, C p2 :
-
Inlet and outlet PM concentration in flue gas, mg/Nm3
- ΔC p :
-
PM reduction, %
- d d :
-
Diameter of a droplet, m
- d d0 :
-
Initial diameter of a droplet, m
- F d :
-
Total droplets surface area, m2
- g :
-
Water volumetric flow rate, l/s
- G b :
-
Boiler water flow rate, m3/h
- G w :
-
Water volumetric flow rate, l/h
- H :
-
Height of the unit, m
- H d :
-
Droplets holdup of the unit
- M f :
-
Fuel consumption, kg//h
- O 2 :
-
Oxygen concentration in flue gas, %
- O f :
-
Fuel lower heating value, MJ/kg
- O fu :
-
Fog unit capacity, kW
- O b :
-
Boiler capacity, kW
- t b1, t b2 :
-
Boiler water input and output temperature, °C
- t g1, t g2 :
-
Gas inlet and outlet temperature, °C
- t w :
-
Water temperature, °C
- t w1, t w2 :
-
Inlet and outlet water temperature, °C
- u d :
-
Droplet velocity, m/s
- u g :
-
Gas velocity, m/s
- u g2 :
-
Outlet gas velocity, m/s
- u r :
-
Settling velocity of a droplet in relation to gas, m/s
- V w :
-
Water volumetric flowrate, m3/s
- V g :
-
Gas volumetric flowrate, m3/s
- S :
-
Cross-sectional area of the unit, m2
References
Ahmad, F., Jain, R.K.: An Experimental study of parameters of wet scrubber for environmental benefit. Int. J. Innov. Res. Sci. Eng. Technol. 5(6), 9675–9680 (2016). https://doi.org/10.15680/IJIRSET/2015.0506024
Ahmed, S., Mohsin, H., Qureshi, K., Shah, A., Siddique, W., Waheed, K., Irfan, N., Ahmad, M., Farooq, A.: Investigation of dust particle removal efficiency of self-priming venturi scrubber using computational fluid dynamics. Nucl. Eng. Technol. (2018). https://doi.org/10.1016/j.met.2018.01.016
Bal, M., Meikap, B.C.: Prediction of hydrodynamic characteristics of a venturi scrubber by using CFD simulation. S. Afr. J. Chem. Eng. 24, 222–231 (2017). https://doi.org/10.1016/j.sajce.2017.10.006
Bal, M., Reddy, T.T., Meikap, B.C.: Performance evaluation of venturi scrubber for the removal of iodine in filtered containment venting system. Chem. Eng. Res. Des. 138, 158–167 (2018). https://doi.org/10.1016/j.cherd.2018.08.019
Bianchini, A., Pellegrini, M., Rossi, J., Saccani, C.: Theoretical model and preliminary design of an innovative wet scrubber for the separation of fine particulate matter produced by biomass combustion in small size boilers. Biomass Bioenerg. 166, 60–71 (2018). https://doi.org/10.1016/j.biombioe.2018.05.011
Bianchini, A., Cento, F.C., Golfera, L., Pelligrini, M., Saccani, C.: Performance analysis of different scrubber systems for removal of particulate emissions from a small size biomass boiler. Biomass Bioenerg. 92, 31–39 (2016). https://doi.org/10.1016/j.biombioe.2016.06.005
Bortolotto, T., Silva, J., Sant'Ana, A.C., Tomazi, K.O., Geremias, R., Angioletto, E., Pich, C.T.: Evaluation of toxic and genotoxic potential of a wet gas scrubber effluent obtained from wooden-based biomass furnaces: a case study in the red ceramic industry in southern Brazil. Ecotoxicol. Environ. Saf. 143, 259–265 (2017). https://doi.org/10.1016/j.ecoenv.2017.05.033
Brassard, P., Palacios, J.H., Godbout, S., Bussières, D., Lagacé, R., Larouche, J.-P., Pelletier, F.: Comparison of the gaseous and particulate matter emissions from the combustion of agricultural and forest biomasses. Biores. Technol. 155, 300–306 (2014). https://doi.org/10.1016/j.biortech.2013.12.027
Chao, C.Y.H., Kwong, P.C.W., Wang, J.H., Cheung, C.W., Kendall, G.: Co-firing coal with rice husk and bamboo and the impact on particulate matters and associated polycyclic aromatic hydrocarbon emissions. Biores. Technol. 99, 83–93 (2008). https://doi.org/10.1016/j.biortech.2006.11.051
Chen, B., Sun, F., Gao, M., Shi, Y.: A 1-D model of spraying performance for wet flue gas desulfurization scrubber based on predicted slurry temperature. Appl. Therm. Eng. 155, 259–266 (2019). https://doi.org/10.1016/j.applthermaleng.2019.03.064
Cheng, T., Zhou, X., Yang, L., Wu, H., Fan, H.: Transformation and removal of ammonium sulfate aerosols and ammonia slip from selective catalytic reduction in wet flue gas desulfurization system. J. Environ. Sci. 88, 72–80 (2020). https://doi.org/10.1016/j.jes.2019.08.002
Collazo, J., Porteiro, J., Míguez, J.L., Granada, E., Gómez, M.A.: Numerical simulation of a small-scale biomass boiler. Energy Convers. Manag. 64, 87–96 (2012). https://doi.org/10.1016/j.enconman.2012.05.020
Cui, L., Song, X., Li, Y., Wang, Y., Feng, Y., Yan, L., Dong, Y.: Synergistic capture of fine particles in wet flue gas through cooling and condensation. Appl. Energy 225, 656–667 (2018). https://doi.org/10.1016/j.apenergy.2018.04.084
Danzomol, B.A., Salami, M.-J.E., Jibrin, S., Khan, R., Nor, I.M.: Performance evaluation of wet scrubber system for industrial air pollution control. ARPN J. Eng. Appl. Sci. 7(12), 1669–1677 (2012)
Dastoori, K., Makin, B., Kolhe, M., Des-Roseaux, M., Conneely, M.: CFD modelling of flue gas particulates in a biomass fired stove with electrostatic precipitation. J. Electrostat. 71(3), 351–356 (2013). https://doi.org/10.1016/j.elstat.2012.12.039
European Commision: Commission regulation (EU) 2015/1189 of 28 April 2015 implementing Directive 2009/125/EC with regard to ecodesign requirements for solid fuel boilers (2015)
Feng, Y., Li, Y., Cui, L.: Critical review of condensable particulate matter. Fuel 224, 801–813 (2018). https://doi.org/10.1016/j.fuel.2018.03.118
Feng, Y., Li, Y., Cui, L., Yan, L., Zhao, C., Dong, Y.: Cold condensing scrubbing method for fine particle reduction from saturated flue gas. Energy. 171, 1193–1205 (2019). https://doi.org/10.1016/j.energy.2019.01.065
Fernandes, U., Costa, M.: Particle emissions from a domestic pellets-fired boiler. Fuel Process. Technol. 103, 51–56 (2012). https://doi.org/10.1016/j.fuproc.2011.08.020
Ghafghazi, S., Sowlati, T., Sokhansanj, S., Bi, X., Melin, S.: Particulate matter emissions from combustion of wood in district heating applications. Renew. Sustain. Energy Rev. 15(6), 3019–3028 (2011). https://doi.org/10.1016/j.rser.2011.04.001
Goel, P., Moharana, A., Nayak, A.K.: Measurement of scrubbing behaviour of simulated radionuclide in a submerged venturi scrubber. Nucl. Eng. Des. 327, 92–99 (2018). https://doi.org/10.1016/j.nucengdes.2017.12.003
Johansson, L., Leckner, B., Gustavsson, L., Cooper, D., Tullin, C., Potter, A.: Emission characteristics of modern and old-type residential boilers fired with wood logs and wood pellets. Atmos. Environ. 38(25), 4183–4195 (2004). https://doi.org/10.1016/j.atmosenv.2004.04.020
Johansson, L.S., Tullin, C., Leckner, B., Sjovall, P.: Particle emissions from biomass combustion in small combustors. Biomass Bioenerg. 25(4), 435–446 (2003). https://doi.org/10.1016/S0961-9534(03)00036-9
Kim, D.H., Park, T., Lee, C.E.: Heat recovery boilers with water spray: part ii: parametric analysis and optimization of design specifications. Therm. Sci. Eng. Progress. 19, 100643 (2020a). https://doi.org/10.1016/j.tsep.2020.100643
Kim, D., Lee, S.J.: Effect of water microdroplet size on the removal of indoor particulate matter. Build. Environ. 181, 107097 (2020b). https://doi.org/10.1016/j.buildenv.2020.107097
Keshavarz, P., Bozorgi, Y., Fathikalahahi, J., Taheri, M.: Prediction of the spray scrubbers’ performance in the gaseous and particulate scrubbing processes. Chem. Eng. J. 140(1), 22–31 (2008). https://doi.org/10.1016/j.cej.2007.08.034
Lazaroiu, G., Oprea, I., Mihăescu, L., Prisecaru, T., Negreanu, G., Mocanu, R.: Biomass briquettes from pitcoal-wood: Boiler test facility combustion case study. J. Environ. Protect. Ecol. 13(2A), 1070–1081 (2012)
Lǎzǎroiu, G., Mihăescu, L., Prisecaru, T., Oprea I., Pîşă, I.,, Negreanu, G., Indrieş R., 2008. Combustion of pitcoal-wood biomass brichettes in a boiler test facility. Environmental Engineering and Management Journal. 7(5), 595–601, 2008, doi:10.30638/eemj.2008.083.
Lee, C.E., Kim, D.H.: Heat recovery boilers with water spray. Part I: thermodynamic analysis validation and boiler practicality. Therm. Sci. Eng. Progress. 18, 100491 (2020). https://doi.org/10.1016/j.tsep.2020.100491
Lim, K., Lee, S.H., Park, H.S.: Prediction for particle removal efficiency of a reverse jet scrubber. J. Aerosol Sci. 37(12), 1826–1839 (2006). https://doi.org/10.1016/j.jaerosci.2006.06.010
Luan, Z., Liu, X., Zheng, M., Zhu, L.: Numerical simulation of square section venturi scrubber with horizontal spray. Procedia Comput. Sci. 107, 117–121 (2017). https://doi.org/10.1016/j.procs.2017.03.066
Meikap, B.C., Biswas, M.N.: Fly-ash removal efficiency in a modified multi-stage bubble column scrubber. Sep. Purif. Technol. 36(6), 177–190 (2004). https://doi.org/10.1016/S1383-5866(03)00213-2
Mohan, B., Meikap, B.C.: Performance characteristics of the particulate removal in a novel spray-cum-bubble column scrubber. Chem. Eng. Res. Des. 87(1), 109–118 (2009). https://doi.org/10.1016/j.cherd.2008.05.011
Mohan, B., Meikap, B.C.: Performance characteristics of the particulate removal in a novel spray-cum-bubble column scrubber. Chem. Eng. Res. Des. 81(1), 109–118 (2009). https://doi.org/10.1016/j.cherd.2008.05.011
Moharana, A., Goel, P., Nayak, A.K.: Performance estimation of a venturi scrubber and its application to self-priming operation in decontaminating aerosol particulates. Nucl. Eng. Des. 320, 165–182 (2017). https://doi.org/10.1016/j.nucengdes.2017.05.023
Molchanov, O., Krpec, K., Horák, J.: Electrostatic precipitation as a method to control the emissions of particulate matter from small-scale combustion units. J. Clean. Prod. 246(119022), 2020 (2020). https://doi.org/10.1016/j.jclepro.2019.119022
Olave, R.J., Forbes, E.G.A., Johnston, C.R., Relf, J.: Particulate and gaseous emissions from different wood fuels during combustion in a small-scale biomass heating system. Atmos. Environ. 157, 49–58 (2017). https://doi.org/10.1016/j.atmosenv.2017.03.003
Olsson, M.: Wheat straw and peat for fuel pellets—organic compounds from combustion. Biomass Bioenergy. 30(6), 555–564 (2006). https://doi.org/10.1016/j.biombioe.2006.01.005
Pak, S.I., Chang, K.S.: Performance estimation of a Venturi scrubber using a computational model for capturing dust particles with liquid spray. J. Hazard. Mater. 138(3), 560–573 (2006). https://doi.org/10.1016/j.jhazmat.2006.05.105
Patra, T.K., Sheth, P.N.: Biomass gasification coupled with producer gas cleaning, bottling and HTS catalyst treatment for H2-rich gas production. Int. J. Hydrogen Energy 44(23), 11602–11616 (2019). https://doi.org/10.1016/j.ijhydene.2019.03.107
Petrov, O., Bi, X., Lau, A.: Impact assessment of biomass-based district heating systems in densely populated communities. Part II: Would the replacement of fossil fuels improve ambient air quality and human health? Atmos. Environ. 161, 191–199 (2017). https://doi.org/10.1016/j.atmosenv.2017.05.001
Price-Allison, A., Lea-Langton, A.R., Mitchel, E.J.S.: Emissions performance of high moisture wood fuels burned in a residential stove. Fuel 239, 1038–1045 (2019). https://doi.org/10.1016/j.fuel.2018.11.090
Priedniece, V., Kalnins, E., Kirsanovs, V., Dzikevics, M., Blumberga, D., Veidenbergs, I.: Sprayed water flowrate, temperature and drop size effects on small capacity flue gas condenser’s performance. Environ. Clim. Technol. 23(3), 333–346 (2019a). https://doi.org/10.2478/rtuect-2019-0099
Priedniece, V., Kalniņš, E., Kirsanovs, V., Pedisius, N., Veidenbergs, I., Blumberga, D.: Particulate matter emission decrease possibility from household sector using flue gas condenser—fog unit. Analysis and interpretation of results. Environ. Clim. Technol. 1(23), 135–151 (2019). https://doi.org/10.2478/rtuect-2019-0010
Prodi, F., Santachiara, G., Belosi, F., Vedernikov, A., Balapanov, D.: Phoretic forces on aerosol particles surrounding an evaporating droplet in microgravity conditions. Atmos. Res. 142, 40–44 (2014). https://doi.org/10.1016/j.atmosres.2013.09.001
Rafidi, N., Brogaard, F., Chen, L., Hakansson, R., Tabikh, A.: CFD and experimental studies on capture of fine particles by liquid droplets in open spray towers. Sustain. Environ. Res. 28(6), 382–388 (2018). https://doi.org/10.1016/j.serj.2018.08.003
Ramanauskas, V., Miliauskas, G.: The water droplets dynamics and phase transformations in biofuel flue gases flow. Int. J. Heat Mass Transf. 131, 546–557 (2019). https://doi.org/10.1016/j.ijheatmasstransfer.2018.06.095
Schober, P., Schwarte, L.A.: Correlation coefficients: appropriate use and interpretation. Anesth. Analg. 126(5), 1763–1768 (2018). https://doi.org/10.1213/ANE.0000000000002864
Simin, W., Jiarui, W., Chen, S., Jian, W.: Numerical investigation on urea particle removal in a spray scrubber using particle capture theory. Chem. Eng. Res. Des. 145, 150–158 (2019). https://doi.org/10.1016/j.cherd.2019.03.011
Siregar, K., Alamsyah, R., Tou, S., Siregar, N.C.: The integration of gasification systems with gas engine by developing wet tar scrubbers and gas filter to produce electrical energy from biomass. MATEC Web Conf. 164, 01024 (2018). https://doi.org/10.1051/matecconf/201816401024
Surjosatyo, A., Anggriawan, M.B., Hermawan, A.A., Dafiqurrohman, H.: Comparison between secondary thermal cracking methods and venturi scrubber filtering in order to reduce tar in biomass gasification. Energy Procedia. 158, 749–754 (2019). https://doi.org/10.1016/j.egypro.2019.01.200
Tong, Z., Yang, B., Jopke, P.K., Zhang, K.M.: Microenvironmental air quality impact of a commercial-scale biomass heating system. Environ. Pollut. 220B, 1112–1120 (2017). https://doi.org/10.1016/j.envpol.2016.11.025
US Environmental Protection Agency: Design Evaluation of Particulate Wet Scrubber System. SI. 412C Module 10,10–3 (2011)
Verma, V.K., Bram, S., Gauthier, G., Ruyck, J.D.: Performance of a domestic pellet boiler as a function of operational loads: part-2. Biomass Bioenergry. 35(1), 272–279 (2011). https://doi.org/10.1016/j.biombioe.2010.08.043
Vicente, E.D., Alves, C.A.: An overview of particulate emissions from residential biomass combustion. Atmos. Res. 199, 159–185 (2018). https://doi.org/10.1016/j.atmosres.2017.08.027
Villeneuve, J., Palacios, J.H., Savoie, P., Godbout, S.: A critical review of emission standards and regulations regarding biomass combustion in small scale units (<3 MW). Biores. Technol. 111, 1–11 (2012). https://doi.org/10.1016/j.biortech.2012.02.061
Wu, H., Pan, D., Zhang, R., Yang, L., Peng, Z., Yang, B.: Reducing fine particle emissions by heterogeneous vapor condensation after wet desulfurization process. Chem. Technol. Biotechnol. (2017). https://doi.org/10.1002/jctb.5236
Zhang, D.: Ash fouling, deposition and slagging in ultra-supercritical coal power plants, ultra-supercritical coal power plants, pp. 133–183. Woodhead Publishing, Sawston (2013)
Zhang, S., Rind, N.A., Tang, N., Liu, H., Yin, X., Yu, J., Ding, B.: Electrospun nanofibers for air filtration. Electrospinning: nanofabrication and applications, pp. 365–389. William Andrew Publishing, Burlington (2019)
Acknowledgements
The work has been supported by European Regional Development Fund project “Individual Heating with Integrated Fog Unit System (IFUS)” 1.1.1.1/16/A/015.
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Blumberga, D., Priedniece, V., Kalniņš, E. et al. Small scale pellet boiler gas treatment in fog unit. Int J Energy Environ Eng 12, 191–202 (2021). https://doi.org/10.1007/s40095-020-00357-x
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DOI: https://doi.org/10.1007/s40095-020-00357-x