Flue Gas Purification

Transcription

1 Flue Gas Purification The wet scrubbing in packed bed wet scrubbers is very efficient and cost effective method of capturing SO 2 and CO 2 from the flue gases to limit the harmful emissions in the atmosphere from the conventional thermal power systems. Main activities: Development of a gypsum flue gas desulfurization technology for small and middle capacity boilers with absorbers of packed bed column type and packing of horizontal expanded metal sheets ensuring high efficiency of SO 2 removal. Study of a new packing of vertical polystyrene plates with crossing inclined capillary grooves for a redistribution layer intended for operation over a basic layer of a packing with vertical walls for increasing the efficiency of the absorption with extremely low liquid flow rate, typical for packed bed absorbers for FGD Investigations on the influence of the liquid viscosity and surface tension on the wettability of different packing materials and on liquid phase leakage in the free volume of packed columns with vertical-wall packings intended for extremely low liquid superficial velocity, typical for packed bed absorbers for FGD Investigation and comparison of performance characteristics of modern highly efficient packings for usage in scrubbers - Raschig Super-Ring (RSR), and Impulse Metal Tower Packing (IMTP) Available tools Experimental installations with packed columns and equipment for packing investigations Infrared gas analyzer Working references Projects in the field: Science Fund of Bulgaria: New technology for energy efficient purification of flue gases from small and middle capacity boilers with obtaining of valuable products ( ). Contracted by Raschig GmbH, Germany: Investigation of pressure drop and kinetics of absorption of high performance packings produced by Raschig GmbH ( ).

2 Publications in the field: - D. Dzhonova-Atanasova, E. Razkazova-Velkova, L. Ljutzkanov, N. Kolev, D. Kolev, Energy efficient SO2 removal from flue gases using the method of Wellman-Lord, J. Chemical Technology and Metallurgy, 48, 5 (2013) D. Dzhonova-Atanasova, E. N. Razkazova-Velkova, L. A. Ljutzkanov. Current problems and development in flue gas desulfurization, J. of Int. Scientific Publications, Materials, Methods and Technologies, Vol.5, Part 1, 2011, pp L. Ljutzkanov, E. Razkazova- Velkova, N. Kolev, D. Dzhonova- Atanasova, D. Kolev. Oxidation of CaSO3 by air in the technology for purification of flue gases from SO2. J. of Int. Scientific Publications, Materials, Methods and Technologies, Vol.5, Part 1, 2011, pp N. Kolev, L. Ljutzkanov, D. Kolev, D. Dzhonova-Atanasova, E. Razkazova- Velkova. New technology for purification of the flue gas from sulfur dioxide. J. of Int. and Technologies, Vol.5, Part 1, 2011, pp E. Razkazova-Velkova, D. Dzhonova- Atanasova, Influence оf the Viscosity and Surface Tension оf the Liquid Phase on the Wettability of Different Packing Materials for Column Apparatuses, J. of Int. and Technologies, 2010, Vol.4, Part 1, pp E. Razkazova-Velkova, D. Dzhonova- Atanasova. Liquid phase leakage in the free volume section of column apparatuses filled with honeycomb packings, J. of Int. and Technologies, Vol.5, Part 1, pp D. Kolev, D. Dzhonova-Atanasova, N. Kolev, Vertical plates with inclined capillary grooves for redistribution of the liquid phase over the cross-section of packed columns I. Equations for calculating the liquid flow-rates in the capillary grooves, Chem. Eng. Process. 47 (2008) D. Dzhonova-Atanasova, D. Kolev, N. Kolev, Height of vertical plates with inclined capillary grooves for a redistribution packing layer of packed columns, Bulg. Chem. Commun., 43 (3) 2011, pp D. Kolev, D. Dzhonova-Atanasova, N. Kolev. Pressure drop of vertical plates with inclined capillary grooves for a redistribution packing layer of packed columns, Bulg. Chem. Commun., 43 (3) 2011, pp D. Dzhonova-Atanasova, N. Kolev, S. Nakov. Determination of the liquid radial spreading coefficients of some highly effective packings, Chem. Eng. Technol., (2007), 30, No.2,

3 Waste Heat Utilization The most efficient option for cooling of wet waste gases is by systems with contact economizers. Typically such a system represents a packed column, in which flue gases are cooled directly by contacting in countercurrent with circulation water entering the column. The utilized heat from the flue gases, including the heat of condensation of the water vapor, is used for industrial or district heating purposes. Main activities: Design of a contact economizer system for flue gas cooling, connected upstream of the absorption system in a gypsum FGD technology for small and middle capacity boilers for the purpose of heating and humidifying air used in the main production. Development of a contact economizer system, as a part of a gas turbine installation, for flue gas heat utilization for steam production and district heating. Generalizing experimental data obtained by different authors from investigations of arranged packings with vertical walls typically used in contact economizers like Raschig rings, Honeycomb packings, blocks with rectangular openings etc., by deriving equations for prediction of the mass transfer coefficients and packing dynamic hold-up. Available tools Experimental installations with packed columns and equipment for packing investigations Working references Projects in the field: Science Fund of Bulgaria: New technology for energy efficient purification of flue gases from small and middle capacity boilers with obtaining of valuable products ( ). Science Fund of Bulgaria: Investigation of energy efficiency of a system with a gas-steam turbine and a contact economizer with fuel conversion in the burning chamber ( ).

4 Materials, Methods and Technologies, Vol.5, P.1, (2011) pp Sv. Nakov, D. Djonova-Atanassova, N. Kolev, Dynamic hold-up of packings with vertical walls, Chemical Engineering and Processing 39, (2000), Publications in the field: - N. Kolev, L. Ljutzkanov, D. Kolev, D. Dzhonova-Atanasova, E. Razkazova- Velkova, New technology for purification of the flue gas from sulfur dioxide, Journal of International Scientific Publications, - N. Kolev, Sv. Nakov, D. Djonova- Atanassova, Mass transfer coefficient of arranged packings with vertical walls under gas-film control, Chemical Engineering and Technology, 18, No 6, (1995), D. Djonova-Atanassova, Sv. Nakov, N. Kolev, Liquid-phase mass transfer coefficient for stacked packings, Theoretical foundations of Chemical Engineering, 30, No 3, (1995),

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